Characterization of silicon carbide thin films and their use in colour sensor - Zhang, S.; Raniero, L.; Fortunato, E.; Liao, X; Hu, Z.; Ferreira, I.; Aguas, H.; Ramos, A.R.; E. Alves; Martins, R. (Solar energy materials and solar cells, 2005)
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Characterization of silicon carbide thin films and their use in colour sensor - Zhang, S.; Raniero, L.; Fortunato, E.; Liao, X; Hu, Z.; Ferreira, I.; Aguas, H.; Ramos, A.R.; E. Alves; Martins, R. (Solar energy materials and solar cells, 2005)
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Contrasting Behavior in Azide Pyrolyses: An Investigation of the Thermal Decompositions of Methyl Azidoformate, Ethyl Azidoformate and 2-Azido-N, N-dimethylacetamide by Ultraviolet Photoelectron Spectroscopy and Matrix Isolation Infrared Spectroscopy - J. M. Dyke; G. Levita; A. Morris; J. S. Ogden; A. A. Dias; M. Algarra; J P Santos; M. L. Costa; P. Rodrigues; M. M. Andrade; M. T. Barros (Chemistry - A European Journal, 2005)
The thermal decompositions of methyl azidoformate (N3COOMe), ethyl azidoformate (N3COOEt) and 2-azido-N,N-dimethylacetamide (N3CH2CONMe2) have been studied by matrix isolation infrared spectroscopy and real-time ultraviolet photoelectron spectroscopy. N2 appears as an initial pyrolysis product in all systems, and the principal interest lies in the fate of the accompanying organic fragment. For methyl azidoformate, four accompanying products were observed: HNCO, H2CO, CH2NH and CO2, and these are believed to arise as a result of two competing decomposition routes of a four-membered cyclic intermediate. Ethyl azidoformate pyrolysis yields four corresponding products: HNCO, MeCHO, MeCHNH and CO2, together with the five-membered-ring compound 2-oxazolidone. In contrast, the initial pyrolysis of 2-azido-N,N-dimethyl acetamide, yields the novel imine intermediate Me2NCOCHNH, which subsequently decomposes into dimethyl formamide (HCONMe2), CO, Me2NH and HCN. This intermediate was detected by matrix isolation IR spectroscopy, and its identity confirmed both by a molecular orbital calculation of its IR spectrum, and by the temperature dependence and distribution of products in the PES and IR studies. Mechanisms are proposed for the formation and decomposition of all the products observed in these three systems, based on the experimental evidence and the results of supporting molecular orbital calculations.
10.1002/chem.200400767 About DOI
Keywords: azides IR spectroscopy matrix isolation photoelectron spectrosopy

Contrasting Behavior in Azide Pyrolyses: An Investigation of the Thermal Decompositions of Methyl Azidoformate, Ethyl Azidoformate and 2-Azido-N, N-dimethylacetamide by Ultraviolet Photoelectron Spectroscopy and Matrix Isolation Infrared Spectroscopy - J. M. Dyke; G. Levita; A. Morris; J. S. Ogden; A. A. Dias; M. Algarra; J P Santos; M. L. Costa; P. Rodrigues; M. M. Andrade; M. T. Barros (Chemistry - A European Journal, 2005)
The thermal decompositions of methyl azidoformate (N3COOMe), ethyl azidoformate (N3COOEt) and 2-azido-N,N-dimethylacetamide (N3CH2CONMe2) have been studied by matrix isolation infrared spectroscopy and real-time ultraviolet photoelectron spectroscopy. N2 appears as an initial pyrolysis product in all systems, and the principal interest lies in the fate of the accompanying organic fragment. For methyl azidoformate, four accompanying products were observed: HNCO, H2CO, CH2NH and CO2, and these are believed to arise as a result of two competing decomposition routes of a four-membered cyclic intermediate. Ethyl azidoformate pyrolysis yields four corresponding products: HNCO, MeCHO, MeCHNH and CO2, together with the five-membered-ring compound 2-oxazolidone. In contrast, the initial pyrolysis of 2-azido-N,N-dimethyl acetamide, yields the novel imine intermediate Me2NCOCHNH, which subsequently decomposes into dimethyl formamide (HCONMe2), CO, Me2NH and HCN. This intermediate was detected by matrix isolation IR spectroscopy, and its identity confirmed both by a molecular orbital calculation of its IR spectrum, and by the temperature dependence and distribution of products in the PES and IR studies. Mechanisms are proposed for the formation and decomposition of all the products observed in these three systems, based on the experimental evidence and the results of supporting molecular orbital calculations.
10.1002/chem.200400767 About DOIJPS-Ref25

Doctoral symposium - Alanen, Marcus; Cabot, Jordi; Goulão, Miguel; Sáez, José (UML Modeling Languages and Applications, 2005)
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Effect of water stress on lupin stem protein analysed by two-dimensional gel electrophoresis - Pinheiro, C.; Kehr, J.; Ricardo, C. P. (Planta, 2005)
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Times Cited: 27 Ricardo, Candido/B-7891-2008; Pinheiro, Carla/A-4053-2008 Pinheiro, Carla/0000-0002-7799-0183 30

Effect of water stress on lupin stem protein analysed by two-dimensional gel electrophoresis - Pinheiro, C.; Kehr, J.; Ricardo, C. P. (Planta, 2005)
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Formal Definition of Metrics upon the CORBA Component Model - Goulão, Miguel; Abreu, Fernando Brito (First International Conference on the Quality of Software Architectures (QoSA'2005), and Proceedings of the Second International conference on Software Quality, 2005)
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Influence of hydrogen plasma on electrical and optical properties of transparent conductive oxides - Raniero, L.; A Gonçalves; Pimentel, A.; Ferreira, I.; Zhang, S.; Pereira, L.; Aguas, H.; Fortunato, E.; Martins, R. (MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS, 2005)
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Influence of hydrogen plasma on electrical and optical properties of transparent conductive oxides - Raniero, L., Gonçalves, A., Pimentel, A., Ferreira, I., Zhang, S., Pereira, L., Águas, H., Fortunato, E., Martins, R. (Materials Research Society Symposium Proceedings, 2005)
In this work we study the optical and electrical behavior of ZnO:Ga, ITO and IZO films deposited on glass after sustaining different hydrogen plasma conditions and exposure times. This work was complemented by analyzing the surface morphology of the set of films, which allow us to determine the role of hydrogen plasma on the film's properties such as Hall mobility, free carrier concentration, sheet resistance, optical transmittance, figure of merit and state of the surface. Apart from that, the performances of solar cells using an intrinsic layer constituted by nanocrystalline silicon will be also presented. The data show that the electrical properties of solar cells were improved by using ZnO:Ga as front contact, allowing a high current density collection and single pin solar cells with efficiencies exceeding 11%. © 2005 Materials Research Society.
cited By 0

Influence of Hydrogen plasma on electrical and optical properties of transparent conductive oxides. - Raniero, L.; A Gonçalves; Pimentel, A.; Ferreira, I.; Zhang, S.; Pereira, L.; Águas, H.; Fortunato, E.; Martins, R. (MRS Proceedings, 2005)
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Influence of the layer thickness and hydrogen dilution on electrical properties of large area amorphous silicon p-i-n solar cell - Raniero, L., Martins, N., Canhola, P., Zhang, S., Pereira, S., Ferreira, I., Fortunato, E., Martins, R. (Solar Energy Materials and Solar Cells, 2005)
The aim of this work is to present data concerning the optimization of performances of a large area amorphous silicon p-i-n solar cell (30×40 cm2) deposited by plasma enhanced chemical vapour deposition (PECVD) at 27.12 MHz. In this work the solar cell was split into small areas of 0.126 cm2, aiming to study the device performance uniformity, where emphasis was put on the role of the n-layer thickness. The solar cells were studied through the spectral response behaviour in the 400-750 nm range as well as by the behaviour of the AC impedance. Solar cells with fill factor of 0.58, open circuit voltage of 0.83 V, short circuit current density of 17.14 mA/cm2 and an efficiency of 8% were obtained at growth rates higher than 0.3 nm/s. © 2004 Elsevier B.V. All rights reserved.
cited By 3

Influence of the layer thickness and hydrogen dilution on electrical properties of large area amorphous silicon p–i–n solar cell - Raniero, L.; N. Martins; Canhola, P.; Zhang, S.; Pereira, S.; Ferreira, I.; Fortunato, E.; Martins, R. (Solar energy materials and solar cells, 2005)
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Insights into the structural determinants of cohesin dockerin specificity revealed by the crystal structure of the type II cohesin from Clostridium thermocellum SdbA - Carvalho, AL; Pires, VMR; Gloster, TM; Turkenburg, JP; Prates, JAM; Ferreira, LMA; Romao, MJ; Davies, GJ; Fontes, CMGA; Gilbert, HJ (Journal of Molecular Biology, 2005)
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Morphology and phylogeny of Botryosphaeria dothidea causing fruit rot of olives - Phillips, AJL; Rumbos, IC; Alves, A; Correia, A (Mycopathologia, 2005)
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Role of annealing environment on the performances of large area ITO films produced by rf magnetron sputtering - Canhola, P.; N. Martins; Raniero, L.; Pereira, S.; Fortunato, E.; Ferreira, I.; Martins, R. (Thin Solid Films, 2005)
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Role of buffer layer on the performances of amorphous silicon solar cells with incorporated nanoparticles produced by plasma enhanced chemical vapor deposition at 27.12 MHz - Raniero, L.; Zhang, S.; Aguas, H.; Ferreira, I.; Igreja, R.; Fortunato, E.; Martins, R. (Thin Solid Films, 2005)
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Role of buffer layer on the performances of amorphous silicon solar cells with incorporated nanoparticles produced by plasma enhanced chemical vapor deposition at 27.12 MHz - Raniero, L., Zhang, S., Águas, H., Ferreira, I., Igreja, R., Fortunato, E., Martins, R. (Thin Solid Films, 2005)
The aim of this paper is to present results concerning the role of the buffer layer on pin devices, deposited in a single chamber for plasma enhanced chemical vapor deposition, using high hydrogen dilution and pressures at 27.12 MHz. By doing so, we allow the incorporation of nanoparticles into the i-layer, during plasma process. The results show solar cells with 8.8% efficiency with a collection efficiency of 95% in the blue region of the spectra. Apart from that, the results from impedance spectroscopy, imaginary impedance vs. real impedance, show difference of a semicircle radius as function of sample temperatures, which could be explained by total device series resistance variation. © 2005 Elsevier B.V. All rights reserved.
cited By 22

Role of buffer layer on the performances of amorphous silicon solar cells with incorporated nanoparticles produced by plasma enhanced chemical vapor deposition at 27.12 MHz - Raniero, L.; Zhang, S.; Aguas, H.; Ferreira, I.; Igreja, R.; Fortunato, E.; Martins, R. (Thin Solid Films, 2005)
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Role of buffer layer on the performances of amorphous silicon solar cells with incorporated nanoparticles produced by plasma enhanced chemical vapor deposition at 27.12 MHz - Raniero, L.; Zhang, S.; Aguas, H.; Ferreira, I.; Igreja, R.; Fortunato, E.; Martins, R. (Thin Solid Films, 2005)
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Study of a-SiC: H buffer layer on nc-Si/a-Si: H solar cells deposited by PECVD technique - Raniero, L.; Ferreira, I.; Aguas, H.; Zhang, S.; Fortunato, E.; Martins, R. (Photovoltaic Specialists Conference, 2005. Conference Record of the Thirty-first IEEE, 2005)
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Study of a-SiC: H buffer layer on nc-Si/a-Si: H solar cells deposited by PECVD technique - Raniero, L.; Ferreira, I.; Aguas, H.; Zhang, S.; Fortunato, E.; Martins, R. (Photovoltaic Specialists Conference, 2005. Conference Record of the Thirty-first IEEE, 2005)
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Study of a-SiC:H buffer layer on nc-Si/a-Si:H solar cells deposited by PECVD technique - Raniero, L., Ferreira, I., Águas, H., Zhang, S., Fortunato, E., Martins, R. (Conference Record of the IEEE Photovoltaic Specialists Conference, 2005)
This work deals with the study of the role of the buffer layers thickness on the TCO/p-a-SiC:H/buffer1/buffer2/i(nc-Si/a-Si:H)/n-a- Si:H/Al solar cell I-V and impedance performances. The aim was to improve the p/i interface region, which has a large influence on the solar cell characteristics and stability. In order to match the difference between the p and i layers optical gaps, the buffer layers were deposited using, for each layer, different methane to silane mixtures, aiming to obtain a gradual match of the corresponding optical gaps. The intrinsic layer was deposited at high hydrogen dilution rates at 27.12 MHz in conditions that allowed the incorporation of nanoparticles/nanoclusters. Solar cells with fill factor of 0.63; open circuit voltage of 0.93 Volts; short circuit current density of 16.13 mA/cm2 and an efficiency of 9.4% were produced with buffer layers around 1.3 nm thick. When comparing these solar cells with conventional amorphous silicon solar cells we notice that the quantum efficiency from ultraviolet to green regions is improved up to 13%, in average. Concerning solar cell capacitance, the data show that the best solar cells exhibit the highest capacitance, meaning that the films are compact and dense, in-line with the other electrical characteristics obtained. ©2005 IEEE.
cited By 0

Sugar metabolism in developing lupin seeds is affected by a short-term water deficit - Pinheiro, C.; A. P. Rodrigues; de Carvalho, IS; Chaves, M. M.; Ricardo, C. P. (Journal of Experimental Botany, 2005)
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Sugar metabolism in developing lupin seeds is affected by a short-term water deficit - Pinheiro, C.; A. P. Rodrigues; de Carvalho, IS; Chaves, M. M.; Ricardo, C. P. (Journal of Experimental Botany, 2005)
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Superoxide reductase from the syphilis spirochete Treponema pallidum: crystallization and structure determination using soft X-rays - Santos-Silva, T; Trincao, J; Carvalho, AL; Bonifacio, C.; Auchere, F; Moura, I; Moura, JJG; Romao, MJ (Acta Crystallographica Section F-Structural Biology and Crystallization Communications, 2005)
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Superoxide reductase from the syphilis spirochete Treponema pallidum: Crystallization and structure determination using soft X-rays - Santos-Silva, T; Trincão, J.; Carvalho, AL; Bonifácio, C.; Auchère, F.; Moura, I; Moura, JJG; Romão, MJ (Acta Crystallographica Section F: Structural Biology and Crystallization Communications, 2005)
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{Amorphous silicon based p-i-i-n structure for color sensor} - Zhang; S; Raniero; L; Fortunato; E (2005)
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{Effect of the load resistance in the linearity and sensitivity of MIS position sensitive detectors} - Aguas; H; Pereira; L; Raniero (2005)
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{Evaluation of Y2O3 as front layer of ceramic crucibles for vaccum induction melting of tial based alloys} - Barbosa, Joaquim; Ribeiro, C Silva; O. M. N. D. Teodoro; Monteiro, Caetano (Proceedings of 2005 TMS Anual Meeting, 2005)
During the last decades titanium alloys were found to be valuable engineering materials for many different applications. Formerly used in critical applications like aerospace, aeronautic and military equipment, where the factor cost is not relevant, titanium alloys are finding now new and different markets. However, the development of such new markets will depend on an effective cost reduction of titanium parts, in order to achieve a selling cost suitable with its application in consumer goods. A possible solution to decrease production costs might be the use of traditional casting techniques to produce near net shape functional parts. During the last years, the authors have developed extensive research work on this field, and a new technique both for melting and moulding, using ceramic multi-layered crucibles and investment casting shells was developed. This paper presents some of the results obtained during that research work: Ti-48Al alloy were melted and cooled inside CaO, MgO and Y O stabilized ZrO crucibles with inside layer of Y O . The chemical composition, hardness and microstructure at the metal-crucible interface, studied by secondary ion mass spectrometry, SEM/EDS and XRS are presented. On a second step, the same alloy was melted on the same crucibles, and poured into graphite moulds, and the crucibles wall was characterized by SEM/EDS and XRS.
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Keywords: ceramic crucible; induction melting; tial

{Influence of hydrogen plasma on electrical and optical properties of transparent conductive oxides} - Raniero; L; Goncalves; A; Pimentel (2005)
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{Optimization of the metal/silicon ratio on nickel assisted crystallization of amorphous silicon} - Pereira; L; Beckers; M; Martins; RMS (2005)
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Phase behaviour of the catalyst dicarbonyl (eta(5)-cyclopentadienyl)-cobalt in carbon dioxide - Casimiro, T.; Montilla, F.; Garcia, S.; Aviles, T.; Raeissi, S.; Shariati, A.; Peters, C. J.; da Ponte, M. N.; Aguiar-Ricardo, A. (Journal of Supercritical Fluids, 2004)
The phase behaviour of the binary mixture of carbon dioxide and the cobalt complex dicarbonyl(eta(5)-cyclopentadienyl)-cobalt, CPCo(CO)(2), has been investigated. This organometallic compound is one of the most effective catalysts of cyclotrimerization reactions of arylisocyanates and alkynes. Vapour-liquid equilibrium (VLE) measurements were undertaken in a static analytical apparatus at 313.15, 323.15 and 363.15 K at pressures up to 15 MPa. p, T isopleths were measured by a synthetic method in a Cailletet apparatus. Nine different compositions ranging from 17.56 to 94.23 mol% of CO2 were measured up to 15 MPa. Modelling with the Peng-Robinson equation of state (PR EOS) gave reasonable results in the correlation of the experimental phase equilibrium compositions using two temperature-dependent interaction parameters. (C) 2003 Elsevier B.V. All rights reserved.
859JWTimes Cited:5Cited References Count:17
Keywords: chemistry; CO2; cpco(co)(2); organometallic catalyst; pr eos; pressures; vle

Overexpression and purification of Treponema pallidum rubredoxin; kinetic evidence for a superoxide-mediated electron transfer with the superoxide reductase neelaredoxin - Auchere, F; Sikkink, R; Cordas, C; Raleiras, P; Tavares, P.; Moura, I; Moura, JJG (Journal of Biological Inorganic Chemistry, 2004)
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{Overexpression and purification of Treponema pallidum rubredoxin; kinetic evidence for a superoxide-mediated electron transfer with the superoxide reductase neelaredoxin} - Auchere, F; Sikkink, R; Cordas, C; Raleiras, P; Tavares, P.; Moura, I; Moura, J (J Biol Inorg Chem, 2004)
{Superoxide reductases are a class of non-haem iron enzymes which catalyse the monovalent reduction of the superoxide anion O2- into hydrogen peroxide and water. Treponema pallidum (Tp), the syphilis spirochete, expresses the gene for a superoxide reductase called neelaredoxin, having the iron protein rubredoxin as the putative electron donor necessary to complete the catalytic cycle. In this work, we present the first cloning, overexpression in Escherichia coli and purification of the Tp rubredoxin. Spectroscopic characterization of this 6 kDa protein allowed us to calculate the molar absorption coefficient of the 490 nm feature of ferric iron
0949-8257 (Print) Journal Article

{Characterization of silicon carbide thin films prepared by VHF-PECVD technology} - Zhang, S.; Raniero, L.; Fortunato, E.; Pereira, L.; N. Martins; Canhola, P.; Ferreira, I.; Nedev, N.; Águas, H.; Martins, R. (Journal of Non-Crystalline Solids, 2004)
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Assessment Methodology for e-Business and e-Commerce in the AEC sector - Grilo Antonio; Maló Pedro; Jardim-Gonçalves Ricardo (2004)
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Space charge studies in LDPE using combined isothermal and non-isothermal current measurements - Lanca MC; Neagu ER; Neagu RM; Dias CJ; Marat-Mendes JN; Das-Gupta DK (IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION, 2004)
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Operadores de agregação difusos. Selecção e casos de aplicação. - Isabel L. Nunes; M. Simões-Marques; Rita A. Ribeiro (11º Congresso da APDIO (Associação Portuguesa de Investigação Operacional), 2004)
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Operadores de agregação difusos. Selecção e casos de aplicação. - Isabel L. Nunes; M. Simões-Marques; Rita A. Ribeiro (11º Congresso da APDIO (Associação Portuguesa de Investigação Operacional), 2004)
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High pressure phase behavior of the system ethane + orange peel oil - Sampaio De Sousa, A.R.; Raeissi, S.; Aguiar-Ricardo, A.; Duarte, C.M.M.; Peters, C. J. (Journal of Supercritical Fluids, 2004)
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Cited By (since 1996):8Export Date: 19 November 2013Source: Scopus

Phase behaviour of the catalyst dicarbonyl(η5- cyclopentadienyl)-cobalt in carbon dioxide - Casimiro, T.; Montilla, F.; Garcia, S.; Avilés, T.; Raeissi, S.; Shariati, A.; Peters, C. J.; Nunes Da Ponte, M.; Aguiar-Ricardo, A. (Journal of Supercritical Fluids, 2004)
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Cited By (since 1996):5Export Date: 19 November 2013Source: Scopus

A visual acoustic high-pressure cell for the study of critical behavior of nonsimple mixtures - Aguiar-Ricardo, A.; Temtem, M.; Casimiro, T.; Ribeiro, N. (Review of Scientific Instruments, 2004)
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Cited By (since 1996):5Export Date: 19 November 2013Source: Scopus

Effect of trimethylsilyl substitution on the chemical properties of triarylphosphines and their corresponding metal-complexes: Solubilising effect in supercritical carbon dioxide - Montilla, F.; Galindo, A.; Rosa, V.; Avilés, T. (Dalton Transactions, 2004)
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Cited By :21Export Date: 17 June 2020

Electrical conductivity of as-grown and oxidized MgO : Li crystals implanted with Li ions - Tardio, M.; Ramirez, R.; Gonzalez, R.; Pinto, JV; R. C. da Silva; E. Alves; Chen, Y. (Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 2004)
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Times Cited: 412th International Conference on Radiation Effects in Insulators Aug 31-sep 05, 2003 Gramado, BRAZIL UFRGS; FAPERGS; CNPQ; FINEP; Elsevier; High Voltage Engn Europa BV

A biological model for the evaluation of human-machine adaptation - Y. Rybarczyk; Mestre D.; Hoppenot P.; Colle E. (AMSE Modelling, Measurement and Control, 2004)

A biologically-inspired model for human-machine adaptation - Y. Rybarczyk; Mestre D.; Hoppenot P.; Colle E. (1st Portuguese Forum of Experimental Psychology, 2004)

Comparison, through Multiple Factorial Analysis, of treatments for Cork oak Sudden Death - Luís Ramos; Manuela Oliveira; João T. Mexia (Listy Biometryczne-Biometrical Letters, 2004)

Développement d’un système par analogie bio-mimétique - Y. Rybarczyk (GdR STIC/Santé – Influence de la présence de la personne dans un système d’assistance aux personnes handicapées : acceptation et évaluation, 2004)

Engineering Aspect-Oriented Systems - G. Blair,; L. Blair; A. Rashid; A. Moreira; J. Araújo,; R. Chitchyan (Aspect-Oriented Software Development, 2004)
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ISBN={0321219767

Estudo Experimental de Punçoamento em Lajes Fungiformes Pré Esforçadas - Ramos, a; Lúcio, V. (Encontro Nacional Betão Estrutural 2004, 2004)
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Evaluation de l’adaptation homme-machine basée sur un modèle biologique - Y. Rybarczyk; Mestre D.; Hoppenot P.; Colle E. (Handicap'04, 2004)

Evolution in time of sudden death of Cork oak and mached series of studies - Luís Ramos; Manuela Oliveira; João T. Mexia (Colloquium Biometryczne, 2004)

Implémentation de mécanismes d’anticipation visuo-motrice en téléopération - Y. Rybarczyk; Mestre D.; Hoppenot P.; Colle E. (Le Travail Humain, 2004)

Models for series of studies with r-order common structure: application to European Union Integration - Luís Ramos; Manuela Oliveira; João T. Mexia; Christoph. Minder (Proceedings of Summer School DATASTAT03, 2004)

Regioselective Copolymerisation of Acryl Sucrose Monomers - M. T. Barros; K. T. Petrova; Ramos, A. M. (J. Org. Chem, 2004)

A study of the human-machine cooperation in a remote-control situation - Y. Rybarczyk (University of Evry, 2004)

Batch Processing Method to Deposit a-Si: H Films by PECVD - Pereira, LuÍs; Ferreira, Isabel; Martins, Rodrigo; Águas, Hugo; Fortunato, Elvira; Raniero, Leandro (Materials Science Forum, 2004)
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Batch processing method to deposit a-Si: H films by PECVD - Raniero, Leandro; Águas, Hugo; Pereira, Lu{\'ıs; Fortunato, Elvira; Ferreira, Isabel; Martins, Rodrigo (Materials Science Forum, 2004)
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Batch processing method to deposit a-Si:H films by PECVD - Raniero, L., Águas, H., Pereira, L., Fortunato, E., Ferreira, I., Martins, R. (Materials Science Forum, 2004)
This work reports a technique to obtain electronic grade intrinsic amorphous silicon using the plasma enhanced chemical vapour deposition technique at 13.56 MHz. The batch processing method consists of igniting the plasma process through a neutral gas such as hydrogen or helium and only feeding the carrier gas containing the species to be decomposed into the reactor when the plasma is stabilized. By doing so, no surface damage is induced in the first deposited layers and so a more compacted and stable film is produced, compared to amorphous films grown by conventional methods. The best deposition conditions to produce films with good transport properties for optoelectronic applications are: temperature ≈ 473 K, 60 < pressure 87 Pa, power density of 32 mW/cm2 and flow of silane ≈ 10 sccm. The growth rate and the microstructure factor are 1.5 Å/s and 3.3×10-2, respectively, while the activation energy ≈ 0.8 eV; dark conductivity at room temperature ≈ 4.37×10-10 (ωcm)-1; photosensiti-vity ≈ 5.02×l06; density of states ≈ 6.6×1015 cm-3; bonded hydrogen concentration ≈ 20 at% and optical band gap ≈ 1.75 eV.
cited By 1

Characterization of silicon carbide thin films prepared by VHF-PECVD technology - Zhang, S.; Raniero, L.; Fortunato, E.; Pereira, L.; N. Martins; Canhola, P.; Ferreira, I.; Nedev, N.; Águas, H.; Martins, R. (Journal of non-crystalline solids, 2004)
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Characterization of silicon carbide thin films prepared by VHF-PECVD technology - Zhang, S.; Raniero, L.; Fortunato, E.; Pereira, L.; N. Martins; Canhola, P.; Ferreira, I.; Nedev, N.; Aguas, H.; Martins, R. (Journal of non-crystalline solids, 2004)
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Characterization of the density of states of polymorphous silicon films produced at 13.56 and 27.12 MHz using CPM and SCLC techniques - Raniero, L.; Pereira, L.; Zhang, Shibin; Ferreira, I.; Águas, H.; Fortunato, E.; Martins, R. (Journal of non-crystalline solids, 2004)
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Characterization of the density of states of polymorphous silicon films produced at 13.56 and 27.12 MHz using CPM and SCLC techniques - Raniero, L., Pereira, L., Zhang, S., Ferreira, I., Águas, H., Fortunato, E., Martins, R. (Journal of Non-Crystalline Solids, 2004)
The aim of this paper is to compare the density of bulk states (DOS) of polymorphous silicon (pm-Si:H) films produced by plasma enhanced chemical vapor deposition at 13.56 and 27.12 MHz using the constant photocurrent method and the space charge limited current (SCLC) technique. The data achieved revealed that the set of films produced present similar DOS. Apart from that, data concerning the correlation of the deposition conditions that lead to the production of pm-Si:H as well as their characteristics, such as the hydrogen content and how hydrogen is bonded, will be discussed, giving special emphasis to the set of mechanical stresses developed. By doing so we could get a better understanding of the nature of hydrogen bonding in pm-Si:H films as well as to determine the role of the excitation frequency on the film's performances, where films with amounts of hydrogen around 20 at.% can have DOS as low as 8 × 10 14 cm-3 with Urbach energies in the range of 41-50 meV. © 2004 Elsevier B.V. All rights reserved.
cited By 9

Characterization of the density of states of polymorphous silicon films produced at 13.56 and 27.12 MHz using CPM and SCLC techniques - Raniero, L.; Pereira, L.; Zhang, Shibin; Ferreira, I.; Águas, H.; Fortunato, E.; Martins, R. (Journal of non-crystalline solids, 2004)
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Composition, Structure and Optical Characteristics of Polymorphous Silicon Films Deposited by PECVD at 27.12 MHz - Ferreira, Isabel; Martins, Rodrigo; Roca i Cabarrocas, Pere; Águas, Hugo; Fortunato, Elvira; Raniero, Leandro (Materials Science Forum, 2004)
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Composition, structure and optical characteristics of polymorphous silicon films deposited by PECVD at 27.12 MHz - Martins, Rodrigo; Águas, Hugo; Ferreira, Isabel; Fortunato, Elvira; Raniero, Leandro; Roca i Cabarrocas, Pere (Materials Science Forum, 2004)
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Crystallization and preliminary X-ray diffraction analysis of the 16-haem cytochrome of Desulfovibrio gigas - Santos-Silva, T; Dias, JM; Bourenkov, G.; Bartunik, H.; Moura, I; Romão, MJ (Acta Crystallographica Section D: Biological Crystallography, 2004)
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Effect of an interfacial oxide layer in the annealing behaviour of Au/a-Si: H MIS photodiodes - Aguas, H.; Pereira, L.; Ferreira, I.; Ramos, A.R.; Viana, A. S.; Andreu, J; Vilarinho, P.; Fortunato, E.; Martins, R. (Journal of non-crystalline solids, 2004)
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Effect of an interfacial oxide layer in the annealing behaviour of Au/a-Si: H MIS photodiodes - Aguas, H.; Pereira, L.; Ferreira, I.; Ramos, A.R.; Viana, A. S.; Andreu, J; Vilarinho, P.; Fortunato, E.; Martins, R. (Journal of non-crystalline solids, 2004)
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Effect of annealing on gold rectifying contacts in amorphous silicon - Pereira, LuÍs; Ferreira, Isabel; Martins, Rodrigo; Vilarinho, Paula M; Águas, Hugo; Fortunato, Elvira; Ramos, A.R.; Viana, A. S.; Andreu, J (Materials Science Forum, 2004)
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Effect of annealing on gold rectifying contacts in amorphous silicon - Águas, Hugo; Pereira, Lu{\'ıs; Ferreira, Isabel; Ramos, A.R.; Viana, A. S.; Andreu, J; Vilarinho, Paula M; Fortunato, Elvira; Martins, Rodrigo (Materials Science Forum, 2004)
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Effect of drought and rewatering on the metabolism of Lupinus albus organs - Pinheiro, C.; Passarinho, J. A.; Ricardo, C. P. (Journal of Plant Physiology, 2004)
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Times Cited: 32 Ricardo, Candido/B-7891-2008; Pinheiro, Carla/A-4053-2008 Pinheiro, Carla/0000-0002-7799-0183 40

Effect of drought and rewatering on the metabolism of Lupinus albus organs - Pinheiro, C.; Passarinho, J. A.; Ricardo, C. P. (Journal of Plant Physiology, 2004)
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Effect of the discharge frequency and impedance on the structural properties of polymorphous silicon - Águas, H.; Raniero, L.; Pereira, L.; Fortunato, E.; Martins, R. (Thin solid films, 2004)
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Effect of trimethylsilyl substitution on the chemical properties of triarylphosphines and their corresponding metal-complexes: Solubilising effect in supercritical carbon dioxide - Montilla, F.; Galindo, A.; Rosa, V.; Aviles, T. (Dalton Transactions, 2004)
The donor strengths of the following triarylphosphine ligands P(Ar)(2)(Ar') (Ar = Ar' = 4-Me3SiC6H4, 1b; 4-Me3CC6H4, 1d; 4-F3CC6H4, 1e; Ar = C6H5, Ar' = 4-Me3SiC6H4, 1c) have been evaluated experimentally and theoretically. The measurements of the J(P-Se) coupling constants of the corresponding synthesised selenides Se=P(Ar)(2)(Ar'), 2b, c and the DFT calculation of the energies of the phosphine lone-pair ( HOMO) reveal insignificant influence on the electronic properties of the substituted phosphines when the trimethylsilyl group is attached to the aryl ring, in marked contrast to the strong electronic effect of the trifluoromethyl group. These triarylphosphine ligands P(Ar)(2)(Ar') reacted with (eta(5)-C5H5)Co(CO)(2), (eta(5)-C5H5)Co(CO)I-2 or PdCl2 to yield the new compounds (eta(5)-C5H5)Co(CO)[P(Ar)(2)(Ar')], 3b, d; (eta(5)-C5H5)COI[P(Ar)(2)(Ar')], 4b-e; and PdCl2[P(Ar)(2)(Ar')](2), 5b, c, respectively. These complexes have been characterized and their spectroscopic properties compared with those reported for the known triphenylphosphine complexes. Again, the contrast of the P-31 NMR and C-13 NMR chemical shifts or C-O or M-Cl stretching frequencies, when applied, does not show an important electronic effect on the metal complex of the trimethylsilyl substituted phosphines with respect to P(C6H5)(3) derivatives. Solubility measurements of complexes 3a and 3b in scCO(2) were performed. We conclude that Me3Si groups on the triarylphosphine improve the solubility of the corresponding metal complex in scCO(2).
845FGTimes Cited:15Cited References Count:45
Keywords: chemistry; donor properties; heteroarylphosphorus compounds; homogeneous catalysis; hydroformylation; hydrogenation; Ligands; nuclear-magnetic-resonance; rhodium; triphenylphosphine

Electronic, Optoelectronic, Spintronic and Ferroelectric Materials-Composition, Structure and Optical Characteristics of Polymorphous Silicon Films Deposited by PECVD at 27.12 MHz - Martins, R.; Aguas, H.; Ferreira, I.; Fortunato, E.; Raniero, L.; Roca Cabarrocas, P (Materials Science Forum, 2004)
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Electronic, Optoelectronic, Spintronic and Ferroelectric Materials-Composition, Structure and Optical Characteristics of Polymorphous Silicon Films Deposited by PECVD at 27.12 MHz - Martins, R.; Aguas, H.; Ferreira, I.; Fortunato, E.; Raniero, L.; Roca Cabarrocas, P (Materials Science Forum, 2004)
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Electronic, Optoelectronic, Spintronic and Ferroelectric Materials-MIS Photodiodes of Polymorphous Silicon Deposited at Higher Growth Rates by 27.12 MHz PECVD Discharge - Aguas, H.; Pereira, L.; Raniero, L.; Fortunato, E.; Martins, R. (Materials Science Forum, 2004)
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Electronic, Optoelectronic, Spintronic and Ferroelectric Materials-Role of Substrate on the Growth Process of Polycrystalline Silicon Thin Films by Low-Pressure Chemical Vapour Deposition - Pereira, L.; Aguas, H.; Raniero, L.; Martins, R. M. S.; Fortunato, E.; Martins, R. (Materials Science Forum, 2004)
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Electronic, Optoelectronic, Spintronic and Ferroelectric Materials-Sputtering Preparation of Silicon Nitride Thin Films for Gate Dielectric Applications - Pereira, L.; Aguas, H.; Igreja, R.; Martins, R. M. S.; Nedev, N.; Raniero, L.; Fortunato, E.; Martins, R. (Materials Science Forum, 2004)
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The family 11 carbohydrate-binding module of Clostridium thermocellum Lic26A-Cel5E accommodates beta-1,4- and beta-1,3-1,4-mixed linked glucans at a single binding site - Carvalho, AL; Goyal, A; Prates, JAM; Bolam, DN; Gilbert, HJ; Pires, VMR; Ferreira, LMA; Planas, A; Romao, MJ; Fontes, CMGA (Journal of Biological Chemistry, 2004)
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Growth of Polymorphous/Nanocrystalline Silicon Films Deposited by PECVD at 13.56 MHz - Pereira, LuÍs; Ferreira, Isabel; Martins, Rodrigo; Águas, Hugo; Fortunato, Elvira; Raniero, Leandro; Zang, S; Boufendi, L (Materials Science Forum, 2004)
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Growth of polymorphous/nanocrystalline silicon films deposited by PECVD at 13.56 MHz - Raniero, L.a , Martins, R.a , Águas, H.a , Zang, S.a , Ferreira, I.a , Pereira, L.a , Fortunato, E.a , Boufendi, L.b (Materials Science Forum, 2004)
This paper aims to characterize the growth process of polymorphous/ nanocrystalline silicon (pm-Si:H) films produced by PECVD at 13.56 MHz. The emphasis is in determining the plasma parameters that allow to control the conditions where pm/nc-Si:H can be obtained under high hydrogen dilution, where the only varied parameter is the silane gas flow, fixing rf power, deposition pressure and substrate temperature. The data achieved show that good pm/nc-Si:H films are produced at 240 Pa using a silane gas flow of 5sccm (dilution 1:70) to which it corresponds films with photosensitivities exceeding 106, optical gaps close to 1.80 eV and 18 at% hydrogen contents. The data also show that under certain deposition conditions the pm-Si:H films peel-off.
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Growth of polymorphous/nanocrystalline silicon films deposited by PECVD at 13.56 MHz - Raniero, Leandro; Martins, Rodrigo; Águas, Hugo; Zang, S; Ferreira, Isabel; Pereira, Lu{\'ıs; Fortunato, Elvira; Boufendi, L (Materials Science Forum, 2004)
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MIS Photodiodes of Polymorphous Silicon Deposited at Higher Growth Rates by 27.12 MHz PECVD Discharge - Águas, Hugo; Pereira, Lu{\'ıs; Raniero, Leandro; Fortunato, Elvira; Martins, Rodrigo (Materials Science Forum, 2004)
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Mutagenesis study on amino acids around the molybdenum centre of the periplasmic nitrate reductase from Ralstonia eutropha - Hettmann, T.; Siddiqui, R.A.; Frey, C.; Santos-Silva, T; Romão, MJ; Diekmann, S. (Biochemical and Biophysical Research Communications, 2004)
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Next generation of thin film transistors based on zinc oxide - Fortunato, E.; Barquinha, P.; Pimentel, A.; Goncalves, A.; Pereira, L.; Marques, A.; Martins, R. (Integration of Advanced Micro-and Nanoelectronic Devices-Critical Issues and Solutions, 2004)
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Times Cited: 0Symposium on Integration of Advanced Micro-and Nanoelectronic Devices held at the 2004 MRS Spring MeetingApr 13-16, 2004San Francisco, CAMat Res Soc

Role of substrate on the growth process of polycrystalline silicon thin films by low-pressure chemical vapour deposition - Pereira, Lu{\'ıs; Águas, Hugo; Raniero, Leandro; Martins, Rui Miguel S; Fortunato, Elvira; Martins, Rodrigo (Materials Science Forum, 2004)
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Role of the rf frequency on the structure and composition of polymorphous silicon films - Aguas, H.; Raniero, L.; Pereira, L.; Viana, A. S.; Fortunato, E.; Martins, R. (Journal of non-crystalline solids, 2004)
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Silicon etching in CF4/O2 and SF6 atmospheres - Silva, A.; Raniero, Leandro; Ferreira, E; Águas, Hugo; Pereira, Lu{\'ıs; Fortunato, Elvira; Martins, Rodrigo (Materials Science Forum, 2004)
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Spectral response of large area amorphous silicon solar cells - Raniero, L.; N. Martins; Canhola, P.; Pereira, S.; Ferreira, I.; Fortunato, E.; Martins, R. (High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes), 2004)
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Spectral response of large area amorphous silicon solar cells - Raniero, L., Martins, N., Canhola, P., Pereira, S., Ferreira, I., Fortunato, E., Martins, R. (High Temperature Material Processes, 2004)
In this work we report the study of spectral response on large area amorphous silicon solar cells (30×40 cm2), deposited through plasma enhanced chemical vapour deposition technique (PECVD) at excitation frequencies of 27.12MHz. To perform this work, the solar cells were split in units of area of 0.126 cm2, which allows determining the device homogeneity over all the entire solar cell. Emphasis of this work is put the role of thickness and optical band gap of p-doped layer on the collection efficiency, spectral response, current density-voltage curves under standard condition and spectroscopy impedance. The results show that high transparent p-doped layer can be deposited at 42mW/cm2, which allows increasing the collection efficiency in 45%, at the blue region. The spectroscopy impedance performed showed to be efficient in analyzing the device shunt resistance, interfaces role on the device performances and the behaviour of the device depletion region, for the range of frequencies analysed.
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Sputtering preparation of silicon nitride thin films for gate dielectric applications - Pereira, L.; Aguas, H.; Igreja, R.; Martins, R. M. S.; Nedev, N.; Raniero, L.; Fortunato, E.; Martins, R. (Advanced Materials Forum Ii, 2004)
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Times Cited: 0 Pereira, L Aguas, H Igreja, R Martins, RMS Nedev, N Raniero, L Fortunato, E Martins, R 2nd International Materials Symposium APR 14-16, 2003 Caparica, PORTUGAL

Sputtering preparation of silicon nitride thin films for gate dielectric applications - Pereira, Lu{\'ıs; Águas, Hugo; Igreja, Rui; Martins, Rui Miguel S; Nedev, N.; Raniero, Leandro; Fortunato, Elvira; Martins, Rodrigo (Materials Science Forum, 2004)
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Structural basis for the mechanism of Ca2+ activation of the di-heme cytochrome c peroxidase from Pseudomonas nautica 617 - Dias, JM; Alves, T.; Bonifacio, C.; Pereira, AS; Trincao, J; Bourgeois, D.; Moura, I; Romao, MJ (Structure, 2004)
Cytochrome c peroxidase (CCP) catalyses the reduction of H2O2 to H2O, an important step in the cellular detoxification process. The crystal structure of the di-heme CCP from Pseudomonas nautica 617 was obtained in two different conformations in a redox state with the electron transfer heme reduced. Form IN, obtained at pH 4.0, does not contain Ca2+ and was refined at 2.2 Angstrom resolution. This inactive form presents a closed conformation where the peroxidatic heme adopts a six-ligand coordination, hindering the peroxidatic reaction from taking place. Form OUT is Ca2+ dependent and was crystallized at pH 5.3 and refined at 2.4 Angstrom resolution. This active form shows an open conformation, with release of the distal histidine (His71) ligand, providing peroxide access to the active site. This is the first time that the active and inactive states are reported for a di-heme peroxidase.
Times Cited: 35 Dias, JM Alves, T Bonifacio, C Pereira, AS Trincao, J Bourgeois, D Moura, I Romao, MJ

A Study of the Thermal Decomposition of 2-Azidoacetamide by Ultraviolet Photoelectron Spectroscopy and Matrix-Isolation Infrared Spectroscopy: Identification of the Imine Intermediate H2NCOCHNH - J. M. Dyke; G. Levita; A. Morris; J. S. Ogden; A. A. Dias; M. Algarra; J P Santos; M. L. Costa; P. Rodrigues; M. T. Barros (The Journal of Physical Chemistry A, 2004)
The thermal decomposition of 2-azidoacetamide (N3CH2CONH2) has been studied by matrix-isolation infrared spectroscopy and real-time ultraviolet photoelectron spectroscopy. N2, CH2NH, HNCO, CO, NH3, and HCN are observed as high-temperature decomposition products, while at lower temperatures, the novel imine intermediate H2NCOCHNH is observed in the matrix-isolation IR experiments. The identity of this intermediate is confirmed both by ab initio molecular orbital calculations of its IR spectrum and by the temperature dependence and distribution of products in the photoelectron spectroscopy (PES) and IR studies. Mechanisms are proposed for the formation and decomposition of the intermediate consistent both with the observed results and with estimated activation energies based on pathway calculations.
DOI: 10.1021/jp031288sJPS-Ref21

Systematic calculation of total atomic energies of ground state configurations - G. C. Rodrigues; P. Indelicato; J P Santos; P. Patté; F. Parente (Atomic Data and Nuclear Data Tables, 2004)
We present a systematic study of atomic binding energies, in the Dirac–Fock approximation, for the Lithium (3 electrons) to the Dubnium (105 electrons) isoelectronic series. In each series we have considered all atomic numbers from the one corresponding to the neutral atom up to Z=118. We have obtained the ground state configurations for several heavy ions with charge larger than one.
doi:10.1016/j.adt.2003.11.005JPS-Ref19

The Ventilation Effect on the Thermal Performance of a Cavity Wall: Numerical and Experimental Analysis - Aelenei, Laura; Rodrigues, A M; Aelenei, Daniel (ROOMVENT 2004 - 9th International Conference on Air Distribution in Rooms, 2004)
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{Batch processing method to deposit a-Si : H films by PECVD} - Raniero; L; Aguas; H; Pereira (2004)
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{Characterization of the density of states of polymorphous silicon films produced at 13.56 and 27.12 MHz using CPM and SCLC techniques} - Raniero; L; Pereira; Zhang; SB (2004)
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{Characterization of TiAl Alloys by Secondary Ion Mass Spectrometry} - Barbosa, J; O. M. N. D. Teodoro; Moutinho, A M C; Ribeiro, S; Monteiro, C (Materials science forum, 2004)
Titanium aluminides are arising as a valuable alternative to superalloys in applications where the ratio resistance/density is important. Together with excellent mechanical and corrosion properties at high temperatures, such characteristics are very attractive for applications in the aeronautical, aerospace and automotive industries. However, the current high selling price, due to high costs of production and raw materials and the need of very specific equipment, are limitative factors for further applications. With the end of the cold war, and the decrease of traditional markets of TiAl, the strategy to develop other applications, strongly depends on the decrease of production costs. An alternative to the present production routes might be the use of traditional casting techniques, by induction melting of the alloy in a ceramic crucible and pouring into ceramic moulds, made by the investment casting process. However, due to the high reactivity of Ti alloys, the use of traditional ceramic materials cannot be used, as they lead to oxide formation and oxygen pick up both from the crucible and the moulding materials. In this work, the relative oxygen concentration of Ti-48Al castings was measured by SIMS ó Secondary Ion Mass Spectrometry. This technique provides a direct measurement of the isotopic composition with high sensitivity. The cylindrical samples were specially prepared to allow the analysis of the area close to the border. Oxygen profiles were acquired for samples obtained with different mould materials. The comparison of such profiles with hardness ones gives insight in the role of the oxygen concentration in the properties of the alloy and in the choice of the most suitable materials for TiAl production
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Keywords: abstract; and corrosion; as a valuable alternative; attractive for applications in; density is important; induction melting; interface analysis; investment casting; properties at high temperatures; sims; such characteristics are very; surface; the; tial; titanium aluminides are arising; to superalloys in applications; together with excellent mechanical; where the ratio resistance

{Growth of polymorphous/nanocrystalline silicon films deposited by PECVD at 13.56 MHz} - Raniero; L; Martins; R; Aguas; H (2004)
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{In-situ GIXRD characterization of the crystallization of Ni-Ti sputtered thin films} - Martins; RMS; Silva, M. A. G.,; RJC; Fernandes; FMB (2004)
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{MIS photodiodes of polyrnorphous silicon deposited at higher growth rates by 27.12 MHz PECVD discharge} - Aguas; H; Pereira; L; Raniero (2004)
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{Role of substrate on the growth process of polycrystalline silicon thin films by low-pressure chemical vapour deposition} - Pereira; L; Aguas; H; Raniero (2004)
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{Silicon etching in CF(4)/O(2) and SF(6) atmospheres} - Silva, M. A. G.,; A; Raniero; L; Ferreira; E (2004)
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{Sputtering preparation of silicon nitride thin films for gate dielectric applications} - Pereira; L; Aguas; H; Igreja; R (2004)
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{Syntheses and structures of molybdenum and tungsten pentabenzylcyclopentadienyl complexes: New chlorination reactions} - Martins, Ana M.; Branquinho, Rita; Cui, Jinlan; Dias, Alberto R.; Duarte, M. Teresa; Fernandes, José; Rodrigues, Sandra S. (Journal of Organometallic Chemistry, 2004)
[M(CpBz)(CO)3CH3] (M=Mo, 2a, W, 2b; CpBz=C5(CH2Ph)5) have been prepared and reacted with PCl5 and PhI · Cl2. Depending on the metal and on the chlorinating reagent used [Mo(CpBz) ($η$2-COCH3)Cl3], 3, [W(CpBz)Cl4], 4, [Mo(CpBz)(CO)3Cl], 5 and [Mo(CpBz)Cl4], 6 have been obtained. The molecular structures of all compounds are reported and two conformations have been characterised for the benzyl substituents. In complexes 2a, 2b and 5 one phenyl ring bends towards the metals while in 3 and 4 the five phenyls point opposite to the metals. © 2004 Elsevier B.V. All rights reserved.
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Keywords: Carbonyl insertion; Chlorination; molybdenum; Oxidation; Pentabenzylcyclopentadienyl; Tungsten

The isolation and characterization of cytochrome c nitrite reductase subunits (NrfA and NrfH) from Desulfovibrio desulfuricans ATCC 27774 - Re-evaluation of the spectroscopic data and redox properties - Almeida, MG; Macieira, S; Goncalves, LL; Huber, R; Cunha, CA; Romao, MJ; Costa, C; Lampreia, J; Moura, JJG; Moura, I (EUROPEAN JOURNAL OF BIOCHEMISTRY, 2003)
The cytochrome c nitrite reductase is isolated from the membranes of the sulfate-reducing bacterium Desulfovibrio desulfuricans ATCC 27774 as a heterooligomeric complex composed by two subunits (61 kDa and 19 kDa) containing c-type hemes, encoded by the genes nrfA and nrfH, respectively. The extracted complex has in average a 2NrfA:1NrfH composition. The separation of ccNiR subunits from one another is accomplished by gel filtration chromatography in the presence of SDS. The amino-acid sequence and biochemical subunits characterization show that NrfA contains five hemes and NrfH four hemes. These considerations enabled the revision of a vast amount of existing spectroscopic data on the NrfHA complex that was not originally well interpreted due to the lack of knowledge on the heme content and the oligomeric enzyme status. Based on EPR and Mossbauer parameters and their correlation to structural information recently obtained from X-ray crystallography on the NrfA structure {[}Cunha, C. A., Macieira, S., Dias, J.M., Almeida, M.G., Goncalves, L. M. L., Costa, C., Lampreia, J., Huber, R., Moura, J. J. G., Moura, I. & Romano, M. (2003) J. Biol. Chem. 278, 17455-17465], we propose the full assignment of midpoint reduction potentials values to the individual hemes. NrfA contains the high-spin catalytic site (-80 mV) as well as a quite unusual high reduction potential (+150 mV)/low-spin bis-His coordinated heme, considered to be the site where electrons enter. In addition, the reassessment of the spectroscopic data allowed the first partial spectroscopic characterization of the NrfH subunit. The four NrfH hemes are all in a low-spin state (S = 1/2). One of them has a g(max) at 3.55, characteristic of bis-histidinyl iron ligands in a noncoplanar arrangement, and has a positive reduction potential.

Cytochrome c nitrite reductase from Desulfovibrio desulfuricans ATCC 27774 - The relevance of the two calcium sites in the structure of the catalytic subunit (NrfA) - Cunha, CA; Macieira, S; Dias, JM; Almeida, G; Goncalves, LL; Costa, C; Lampreia, J; Huber, R; Moura, JJG; Moura, I; Romao, MJ (JOURNAL OF BIOLOGICAL CHEMISTRY, 2003)
The gene encoding cytochrome c nitrite reductase (NrfA) from Desulfovibrio desulfuricans ATCC 27774 was sequenced and the crystal structure of the enzyme was determined to 2.3-Angstrom resolution. In comparison with homologous structures, it presents structural differences mainly located at the regions surrounding the putative substrate inlet and product outlet, and includes a well defined second calcium site with octahedral geometry, coordinated to propionates of hemes 3 and 4, and caged by a loop non-existent in the previous structures. The highly negative electrostatic potential in the environment around hemes 3 and 4 suggests that the main role of this calcium ion may not be electrostatic but structural, namely in the stabilization of the conformation of the additional loop that cages it and influences the solvent accessibility of heme 4. The NrfA active site is similar to that of peroxidases with a nearby calcium site at the heme distal side nearly in the same location as occurs in the class II and class III peroxidases. This fact suggests that the calcium ion at the distal side of the active site in the NrfA enzymes may have a similar physiological role to that reported for the peroxidases.

Evaluation of Al/SiC wetting characteristics in functionally graded metal-matrix composites by synchrotron radiation microtomography - Velhinho A; Sequeira PD; Martins R; Vignoles G; Fernandes FB; Botas JD; Rocha LA (Functionally Graded Materials Vii, 2003)
The concept of functionally graded material (FGM), may be considered as a model particularly interesting to be applied in components for the automotive industry, if reliability and cost can be controlled in an advantageous way. In fact, coupling superior superficial wear resistance with a significant bulk toughness, without compromising important weight savings, by using Al-Si metal matrix composites (MMC’s) selectively reinforced at the surface with SiC particles, is likely to be considered as a innovative advance to that industrial field, if adequate production techniques are developed. Casting under a centrifugal force may well be considered as one of the most effective methods for processing Al-based FGM´s. A primary problem to be faced when producing MMC´s reinforced with ceramic particles is related with the imperfect wetting of the ceramic particles by the molten matrix alloy. A first consequence of defective wetting may be the formation of ceramic-ceramic, ceramic-gas and/or metal-gas interfaces, instead of the desired metal-ceramic interface. Secondly, wetting phenomena play an essential role regarding the physical, chemical and mechanical characteristics of the metal/ceramic interface. A general consequence of these aspects may be related with the degradation of the material properties, be it mechanical, chemical, or thermal in nature. The present work refers to an X-ray microtomography experiment aiming at the elucidation of some aspects regarding particle distribution in SiCp-reinforced functionally graded aluminium composites. Precursor composites were produced by rheocasting. These were then molten and centrifugally cast in order to produce the FGM composites. From these, small cylindrical samples were extracted and observed by X-ray microtomography at the European Synchrotron Radiation Facility (ESRF). The 3D tomographic images were obtained in edge-detection mode (phase-contrast mode), and an adequate segmentation procedure was employed to isolate the pores and SiC particles from the Al matrix. This has allowed a study of the relations between the matrix, the SiC particles, and locally intervening porosities of varying shapes, aiming at a better understanding of the mechanisms involved.
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X-ray tomographic imaging of Al/SiCp functionally graded composites fabricated by centrifugal casting - Velhinho A; Sequeira PD; Martins R; Vignoles G; Fernandes FB; Botas JD; Rocha LA (Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 2003)
The present work refers to an X-ray microtomography experiment aiming at the elucidation of some aspects regarding particle distribution in SiC-particle-reinforced functionally graded aluminium composites. Precursor composites were produced by rheocasting. These were then molten and centrifugally cast to obtain the functionally graded composites. From these, cylindrical samples, around 1 mm in diameter, were extracted, which were then irradiated with a X-ray beam produced at the European Synchrotron Radiation Facility. The 3-D images were obtained in edge-detection mode. A segmentation procedure has been adapted in order to separate the pores and SiC particles from the Al matrix. Preliminary results on the particle and pore distributions are presented.
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Crystallization and preliminary X-ray diffraction analysis of the di-haem cytochrome c peroxidase from Pseudomonas stutzeri - Bonifacio, C.; Cunha, CA; Muller, A.; Timoteo, C. G.; Dias, JM; Moura, I; Romao, MJ (Acta Crystallogr D Biol Crystallogr, 2003)
Crystals of cytochrome c peroxidase from Pseudomonas stutzeri were obtained using sodium citrate and PEG 8000 as precipitants. A complete data set was collected to a resolution of 1.6 A under cryogenic conditions using synchrotron radiation at the ESRF. The crystals belong to space group P2(1), with unit-cell parameters a = 69.29, b = 143.31, c = 76.83 A, beta = 100.78 degrees. Four CCP molecules were found in the asymmetric unit, corresponding to a pair of dimers related by local dyads. The crystal packing in the structure shows that the functional dimers can dimerize, as suggested by previous biochemical studies.
Journal ArticleResearch Support, Non-U.S. Gov'tDenmark
Keywords: Crystallization/methods; Crystallography, X-Ray; Cytochrome-c Peroxidase/*chemistry; Dimerization; Heme/*chemistry; Models, Molecular; Pseudomonas/*enzymology; Synchrotrons

Trimethylsilyl-substituted ligands as solubilizers of metal complexes in supercritical carbon dioxide - Montilla, F.; Rosa, V.; Prevett, C.; Avilés, T.; Nunes Da Ponte, M.; Masi, D.; Mealli, C. (Dalton Transactions, 2003)
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Cited By :26Export Date: 17 June 2020

Using Aspects to Develop Built-In Tests for Components - J. M. Bruel,; J. Araújo,; A. Moreira; A. Royer (4th AOSD Modeling With UML Workshop, na 6th International Conference on the Unified Modeling Language (UML 2003), 2003)
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Analysis Patterns Specifications: Filling the Gaps - M. Pantoquilho,; R. Raminhos; J. Araújo, (Viking Plop, 2003)
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Faseamento construtivo da cobertura do Novo Estadio do Sporting - Amarante dos Santos, F. P.; Reis, A. J. (IV Congresso de Construção Metálica e Mista, 2003)

A Prototype software for the Diagnostic of Atrial fibrillation - Carvoeiras, P.; Rodrigues, M.J.; Batista A.G.; Ortigueira, M.D. (XXIV Congresso Português de Cardiologia and Revista Portuguesa de Cardiologia, 2003)

Punçoamento em Lajes Fungiformes Pré-Esforçadas - António Ramos (IST-UTL, 2003)
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Time scaling internal state predictive control of a solar plant - Neves-Silva, R.; L. M. Rato; Lemos, J. M. (IFAC - Control Engineering Practice (Special issue on IFAC-B’02 prize winning applications), 2003)

Variable sampling adaptive control of a distributed collector solar field - Neves-Silva, R.; Lemos, J. M.; L. M. Rato (IEEE Trans. Control Systems Technology (Special issue on control of industrial spatially distributed processes), 2003)

Analysis of a Ventilated Residential Building by Means of an Air Based Radiative Cooling System - Aelenei, Daniel; Canha da Piedade, A; Rodrigues, A M (AIVC BETEC 2003 Ventilation - Humidity Control and Energy Conference, 2003)
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A biochemical and molecular characterization of LEP1, an extensin peroxidase from lupin - Price, NJ; Pinheiro, C.; C.M. Soares; Ashford, DA; Ricardo, C. P.; Jackson, PA (Journal of Biological Chemistry, 2003)
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A biochemical and molecular characterization of LEP1, an extensin peroxidase from lupin - Price, NJ; Pinheiro, C.; C.M. Soares; Ashford, DA; Ricardo, C. P.; Jackson, PA (Journal of Biological Chemistry, 2003)
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Botryosphaeria and related taxa causing oak canker in southwestern Spain - Sanchez, ME; Venegas, J; Romero, MA; Phillips, AJL; Trapero, A (Plant Disease, 2003)
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Cellulosome assembly revealed by the crystal structure of the cohesin-dockerin complex - Carvalho, AL; Dias, FMV; Prates, JAM; Nagy, T; Gilbert, HJ; Davies, GJ; Ferreira, LMA; Romao, MJ; Fontes, CMGA (Proceedings of the National Academy of Sciences of the United States of America, 2003)
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Correlation between the tunnelling oxide and I-V curves of MIS photodiodes - Aguas, H.; Pereira, L.; Goullet, A; Silva, R.; Fortunato, E.; Martins, R.; Abelson, JR; Ganguly, G; Matsumura, H; Robertson, J; Schiff, EA (Amorphous and Nanocrystalline Silicon-Based Films-2003, 2003)
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An Experimental Study of a Naturally Ventilated Cavity Wall - Aelenei, Laura; Rodrigues, A M; Aelenei, Daniel (AIVC BETEC 2003 Ventilation - Humidity Control and Energy Conference, 2003)
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Flux Modelling of Reluctance Machines with Bulk Superconducting Materials - Athanasis Sfetsos; João Pina; Anabela Gonçalves; Mário Neves; Amadeu Rodrigues (Electromotion Review, 2003)
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Large area deposition of polymorphous silicon by plasma enhanced chemical vapor deposition at 27.12 MHz and 13.56 MHz - Aguas, H.; Silva, V.; Fortunato, E.; Lebib, S; Roca i Cabarrocas, P; Ferreira, I.; Guimaraes, L; Martins, R. (Japanese journal of applied physics, 2003)
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Polymorphous silicon films deposited at 27.12 MHz - Martins, Rodrigo; Águas, Hugo; Ferreira, Isabel; Fortunato, Elvira; Lebib, Sarra; Roca i Cabarrocas, P; Guimarães, Leopoldo (Chemical Vapor Deposition, 2003)
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Polymorphous silicon films deposited at 27.12 MHz - Martins, Rodrigo; Águas, Hugo; Ferreira, Isabel; Fortunato, Elvira; Lebib, Sarra; Roca i Cabarrocas, P; Guimarães, Leopoldo (Chemical Vapor Deposition, 2003)
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Polymorphous Silicon Films Produced in Large Area Reactors by PECVD at 27.12 MHz and 13.56 MHz - Águas, H.; Raniero, L.; Pereira, L.; Fortunato, E.; i Cabarrocas, P Roca; Martins, R. (MRS Proceedings, 2003)
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Relaxation mapping analysis with an hyperbolic heating rate - Dias, C. J.; Egami, T; Greer, AL; Inoue, A; Ranganathan, S (Supercooled Liquids, Glass Transition and Bulk Metallic Glasses, 2003)
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Systematic calculation of Total Atomic Binding Energies - P. Indelicato; G. C. Rodrigues; J P Santos; P. Patté; J. P. Marques; F. Parente (Hyperfine Interactions, 2003)
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JPS-Ref16

Thermally Stimulated Depolarization Currents and Optical Transmissionon Liquid Crystal/Cellulose Derivative Composite Devices - Rosu, C; Manaila-Maximean, D; Godinho, M. H.; Almeida, PL (Molecular Crystals and Liquid Crystals, 2003)
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Torque Modelling of a Superconducting Reluctance Machine - Amadeu Rodrigues; B. A. Potter; João Pina; Anabela Gonçalves; Mário Neves (Electromotion Review, 2003)
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Trimethylsilyl-substituted ligands as solubilizers of metal complexes in supercritical carbon dioxide - Montilla, F.; Rosa, V.; Prevett, C.; Aviles, T.; da Ponte, M. N.; Masi, D.; Mealli, C. (Dalton Transactions, 2003)
The SiMe3 group (TMS), introduced as a substituent at the cyclopentadienyl ligand, is found to magnify the solubility of the corresponding metal complexes in supercritical carbon dioxide (scCO(2)). This is verified from comparative solubility measurements of the species (eta(5)-Me-3 SiC5H4)MoO2 Cl, 1a, (eta(5)-Me3SiC5H4)(2)ZrCl2, 2a, and (eta(5)-Me3SiC5H4)Co(CO)I-2.0.5(I-2), 3a (newly synthesised), and of their unsubstituted precursors 1b-3b, respectively. In spite of the increased solubility, the chemical, structural and reactivity properties of the TMS derivatives are scarcely affected. Confirmation comes from a detailed study of the cobalt complex 3a that includes X-ray structural determination. The geometry is most similar to that of the precursor 3b while an apparently different Co-CO interaction is observed in the carboxylated analogue [(eta(5)-PhCH2CO2C5H4)Co(CO) I-2, 3c]. The problem is computationally tackled by using the DFT B3LYP method. The optimised geometries of the simplified models of 3a-3c are all very similar. In particular, the computed stretching frequency of the unique CO ligand is consistent with the insignificant influence of the TMS group while it suggests a reduced amount of metal back-donation in 3c. It is inferred that the TMS complexes 1a-3a, while having higher solubility in scCO2, maintain almost unaltered the electronic and chemical features of their parent compounds. In particular, the role of 1a-3a as catalysts, that is well documented for homogeneous solutions, remains unaltered in the very different scCO(2) environment. The assumption is experimentally validated for 1a by performing with the latter two classic catalytic processes. The first process is the oxidation of PPh3 that is achieved by using molecular oxygen as an oxidant. The second example concerns the epoxidation of cyclohexene achieved in presence of tert-butyl hydroperoxide (TBHP).
683YDTimes Cited:18Cited References Count:55
Keywords: alkyl; Catalysis; crystal-structure; derivatives; hydrogenation; olefins; transition-metals

{Formation of a stable cyano-bridged dinuclear iron cluster following oxidation of the superoxide reductases from Treponema pallidum and Desulfovibrio vulgaris with K(3)Fe(CN)(6)} - Auchere, F; Raleiras, P; Benson, L; Venyaminov, S; Tavares, P.; Moura, J; Moura, I; Rusnak, F (Inorganic chemistry, 2003)
Superoxide reductases catalyze the monovalent reduction of superoxide anion to hydrogen peroxide. Spectroscopic evidence for the formation of a dinuclear cyano-bridged adduct after K(3)Fe(CN)(6) oxidation of the superoxide reductases neelaredoxin from Treponema pallidum and desulfoferrodoxin from Desulfovibrio vulgaris was reported. Oxidation with K(3)Fe(CN)(6) reveals a band in the near-IR with lambda(max) at 1020 nm, coupled with an increase of the iron content by almost 2-fold. Fourier transform infrared spectroscopy provided additional evidence with CN-stretching vibrations at 2095, 2025-2030, and 2047 cm(-)(1), assigned to a ferrocyanide adduct of the enzyme. Interestingly, the low-temperature electronic paramagnetic resonance (EPR) spectra of oxidized TpNlr reveal at least three different species indicating structural heterogeneity in the coordination environment of the active site Fe ion. Given the likely 6-coordinate geometry of the active site Fe(3+) ion in the ferrocyanide adduct, we propose that the rhombic EPR species can serve as a model of a hexacoordinate form of the active site.
0020-1669 (Print) Journal Article

{Polymorphous silicon films produced in large area reactors by PECVD at 27.12 MHz and 13.56 MHz} - Aguas; H; Raniero; L; Pereira (2003)
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{Potential of semi-automated in vitro gas production technique for sorghum silages evaluation} - Mauricio; RM; Pereira; LGR; Goncalves; LC (2003)
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Influence of the strain on the electrical resistance of zinc oxide doped thin film deposited on polymer substrates - Fortunato E; Nunes P; Marques A; Costa D; Aguas H; Ferreira I; d CMEV; GODINHO MH; Almeida PL; Borges JP; Martins R (Advanced Engineering Materials, 2002)
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Transparent, conductive ZnO : Al thin film deposited on polymer substrates by RF magnetron sputtering - Fortunato E; Nunes P; Marques A; Costa D; Aguas H; Ferreira I; Costa MEV; GODINHO MH; Almeida PL; Borges JP; Martins R (Surface & Coatings Technology, 2002)
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Análise ergonómica de postos de trabalho apoiada por um sistema pericial difuso - Isabel L. Nunes; Rita A. Ribeiro; V. Machado (10º Congresso da APDIO (Associação Portuguesa de Investigação Operacional), 2002)
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Enhanced electron screening in d(d, p)t for deuterated Ta - Raiola, F.; Migliardi, P.; Gyurky, G.; Aliotta, M.; Formicola, A.; Bonetti, R.; Broggini, C.; Campajola, L.; Corvisiero, P.; Costantini, H.; Cruz, J.; D'Onofrio, A.; et al. (European Physical Journal A, 2002)
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Times Cited: 67Gyurky, Gyorgy/F-1078-2010; Fulop, Zsolt/B-2262-2008; Prada Moroni, Pier Giorgio/G-5565-2011; Aliotta, Marialuisa /H-2567-2012; Gyurky, Gyorgy/B-7254-2013

First measurement of the d(p, gamma)He-3 cross section down to the solar Gamow peak - Casella, C.; Costantini, H.; Lemut, A.; Limata, B.; Bonetti, R.; Broggini, C.; Campajola, L.; Corvisiero, P.; Cruz, J.; D'Onofrio, A.; Formicola, A.; Fulop, Z.; et al. (Nuclear Physics A, 2002)
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Times Cited: 75Gyurky, Gyorgy/F-1078-2010; Fulop, Zsolt/B-2262-2008; Lemut, Alberto/G-8206-2012; Gyurky, Gyorgy/B-7254-2013

Hydroformylation of alkenes in supercritical carbon dioxide catalysed by rhodium trialkylphosphine complexes - Sellin, M. F.; Bach, I.; Webster, J. M.; Montilla, F.; Rosa, V.; Avilés, T.; Poliakoff, M.; Cole-Hamilton, D. J. (Journal of the Chemical Society. Dalton Transactions, 2002)
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Cited By :77Export Date: 17 June 2020

A new setup for the underground study of capture reactions - Casella, C.; Costantini, H.; Lemut, A.; Limata, B.; Bemmerer, D.; Bonetti, R.; Broggini, C.; Campajola, L.; Cocconi, P.; Corvisiero, P.; Cruz, J.; D'Onofrio, A.; et al. (Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2002)
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Times Cited: 30Gyurky, Gyorgy/F-1078-2010; vomiero, alberto/F-7567-2010; Fulop, Zsolt/B-2262-2008; Lemut, Alberto/G-8206-2012; Gyurky, Gyorgy/B-7254-2013; Bemmerer, Daniel/C-9092-2013 Bemmerer, Daniel/0000-0003-0470-8367

Proton-induced gamma-ray analysis of lithium in thick samples - R. Mateus; Jesus, A P; Braizinha, B.; Cruz, J.; Pinto, JV; Ribeiro, J P (Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 2002)
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Times Cited: 1015th International Conference on Ion-Beam Analysis (IBA-15) Jul 15-20, 2001 Cairns, australia Mateus, Rodrigo/A-4514-2013 Mateus, Rodrigo/0000-0001-6733-6359

Aspect-Oriented Requirements with UML - J. Araújo,; A. Moreira; I. S. Brito; A. Rashid (5th International Conference on the Unified Modeling Language (UML 2002), 2002)
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Commande à distance d’un système d’assistance robotique aux personnes handicapées - Y. Rybarczyk; Ait Aider O.; Hoppenot P.; Colle E. (Handicap’02, 2002)

Contribution of neuroscience to the teleoperation of rehabilitation robot - Y. Rybarczyk; Colle E.; Hoppenot P. (IEEE Systems, Man and Cybernetic’02, 2002)

Modelos de análise de estruturas de engenharia civil: Coberturas de estádios e pontes de tirantes - Reis, A.; Pedro, J.; Amarante dos Santos, F. P.; Salvador, L. (VII Congresso de Mecanica Aplicada e Computacional, 2002)

Remote control of a biomimetics robot assistance system for disabled persons - Y. Rybarczyk; Ait Aider O.; Hoppenot P.; Colle E. (AMSE Modelling, Measurement and Control, 2002)

Uma obra de arte especial sobre a VCI no Porto: Faseamento Construtivo - Reis, A. J.; Amarante dos Santos, F. P. (Encontro Nacional de Betão Estrutural, 2002)

Atomic force microscopy study of hydroxypropylcellulose films prepared from liquid crystalline aqueous solutions - Godinho, M. H.; Fonseca, JG; Ribeiro, AC; Melo, LV; Brogueira, P. (Macromolecules, 2002)
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Crystal structure of a prostate kallikrein isolated from stallion seminal plasma: A homologue of human PSA - Carvalho, AL; Sanz, L.; Barettino, D; Romero, A.; Calvete, JJ; Romao, MJ (Journal of Molecular Biology, 2002)
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How plants cope with water stress in the field. Photosynthesis and growth - Chaves, M. M.; Pereira, JS; Maroco, J; Rodrigues, ML; Ricardo, CPP; Osorio, ML; Carvalho, I; Faria, T; Pinheiro, C. (Annals of Botany, 2002)
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How plants cope with water stress in the field. Photosynthesis and growth - Chaves, M. M.; Pereira, JS; Maroco, J; Rodrigues, ML; Ricardo, CPP; Osorio, ML; Carvalho, I; Faria, T; Pinheiro, C. (Annals of Botany, 2002)
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Hydroformylation of alkenes in supercritical carbon dioxide catalysed by rhodium trialkylphosphine complexes - Sellin, M. F.; Bach, I.; Webster, J. M.; Montilla, F.; Rosa, V.; Aviles, T.; Poliakoff, M.; Cole-Hamilton, D. J. (Journal of the Chemical Society-Dalton Transactions, 2002)
Rhodium complexes modified by simple trialkylphosphines can be used to carry out homogeneous hydroformylation in supercritical carbon dioxide (scCO(2)). The catalyst derived from PEt3 is more active and slightly more selective for the linear products in scCO2 than in toluene, and under the same reaction conditions [100degreesC, 40 bar of CO/H-2 (1:1)] P(OPri)(3) is also an effective ligand giving good catalyst solubility and activity. Other ligands such as PPh3, POct(3), PCy3, and P(4-C6H4But)(3) are less effective because of the low solubility of their rhodium complexes in scCO(2). P(4-C6H4SiMe3)(n) Ph3-n (n = 3 or 1) and P(OPh)(3) impart activity despite their complexes only being poorly soluble in scCO(2). Under subcritical conditions, using PEt3 as the ligand, C7-alcohols from hydrogenation of the first formed aldehydes are the main products whilst above a total pressure of 200 bar, where the solution remains supercritical (monophasic) throughout the reaction, aldehydes are obtained with 97% selectivity. High pressure IR studies in scCO(2) using PEt3 as the ligand are reported.
623YETimes Cited:36Cited References Count:94
Keywords: 2-phase hydroformylation; asymmetric hydroformylation; CO2; higher olefins; homogeneous catalysis; ionic liquid; Ligands; phase catalysis; selective hydroformylation; styrene hydroformylation

A Numerical and Experimental Investigation of a Flat Plate Collector - Aelenei, Daniel; Canha da Piedade, A; Rodrigues, A M (EPIC 2002-Energy Efficient & Healthy Buildings in Sustainable Cities Proceedings, 2002)
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{A new setup for the underground study of capture reactions} - Casella, C.; Costantini, H.; Lemut, a.; Limata, B.; Bemmerer, D.; Bonetti, R.; Broggini, C.; Campajola, L.; Cocconi, P.; Corvisiero, P.; Cruz, J.; D'Onofrio, a.; et al. (Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2002)
For the study of astrophysically relevant capture reactions in the underground laboratory LUNA a new setup of high sensitivity has been implemented. The setup includes a windowless gas target, a 4$π$ BGO summing crystal, and beam calorimeters. The setup has been recently used to measure the d(p,$γ$)3He cross-section for the first time within its solar Gamow peak, i.e. down to 2.5keV c.m. energy. The features of the optimized setup are described. © 2002 Elsevier Science B.V. All rights reserved.
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Keywords: 160; 169; 2002; 489; a; a new setup for; b; bemmerer d; bonetti a; broggini e; c; campajola c; capture reactions; casella a; cocconi b; corvisiero b; costantini b; cruz f; d; h; in physics research a; j; l; lear instruments and methods; lemut b; limata c; onofrio g; p; r; the underground study of

Histomorphogenesis of embryos of Upper Jurassic Theropods from Lourinhã (Portugal) - Armand de Ricqlès; Mateus,Octávio; Miguel Telles Antunes; Philippe Taquet (Comptes Rendus de l{\textquotesingle}Académie des Sciences - Series IIA - Earth and Planetary Science, 2001)
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Histomorphogenesis of embryos of Upper Jurassic Theropods from Lourinha (Portugal) - Ricqlès, A de; O. Mateus; Antunes, MT; Taquet, P (Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule a-Sciences De La Terre Et Des Planetes, 2001)
Remains of dinosaurian embryos, hatchlings and early juveniles are currently the subject of increasing interest, as new discoveries and techniques now allow to analyse palaeobiological subjects such as growth and life history strategies of dinosaurs. So far, available ‘embryonic’ material mainly involved Ornithopods and some Theropods of Upper Cretaceous age. We describe here the histology of several bones (vertebrae, limb bones) from the tiny but exceptionally well preserved in ovo remains of Upper Jurassic Theropod dinosaurs from the Paimogo locality near Lourinhã (Portugal). This Jurassic material allows to extend in time and to considerably supplement in great details our knowledge of early phases of growth in diameter and in length of endoskeletal bones of various shape, as well as shape modelling among carnivorous dinosaurs. Endochondral ossification in both short and long bones involves extensive pads of calcified cartilages permeated by marrow buds. We discuss the likely occurrence of genuine cartilage canals in dinosaurs and of an avian-like ‘medullary cartilaginous cone’ in Theropods. Patterns of periosteal ossification suggest high initial growth rates (20 μ m·day−1 or more), at once modulated by precise and locally specific changes in rates of new bone deposition. The resulting very precise shape modelling appears to start early and to involve at once some biomechanical components.
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{Silicon carbide alloys produced by hot wire, hot wire plasma-assisted and plasma-enhanced CVD techniques} - Ferreira, I.; Costa, M.E.V.; Pereira, L.; Fortunato, E.; Martins, R.; Ramos, A.R.; Silva, M.F. (Applied Surface Science, 2001)
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CPCO(CO)(2)-catalysed cyclotrimerisation of alkynes in supercritical carbon dioxide - Montilla, F.; Aviles, T.; Casimiro, T.; Ricardo, A. A.; da Ponte, M. N. (Journal of Organometallic Chemistry, 2001)
The reactivity of mono-substituted HC=CR (R =Ph. a; CH2OH, b; CH2CH2CH2CH3, c) and di-substituted RC=CR (R = CH2CH3, d; CO2CH3, e; Ph. f) acetylenes was studied in supercritical carbon dioxide (scCO(2)) using the easily available complex CpCo(CO)(2) as catalyst. The reaction of phenylacetylene produced a mixture of the isomeric cyclotrimers 1,3,5- (2a) and 1.2,4-triphenylbenzene (2a '). in a 1:5 ratio, and traces of cobaltcyclopentadienone complexes CPCO(eta (4)-C4H2[Ph](2)CO) (6a, mixture of isomers). The possible product formed by the incorporation of CO, to alkynes, i.e. diphenylpyrone (7a) was not observed. The reaction of the cobaltacyclopentadiene complex CpCo(1.4-sigma -C-4[Ph](4))(PPh)(3) (8f), in scCO(2), was performed. No insertion of CO2 into the Co-C a-bond to form tetraphenylpyrone (7f) by reductive elimination was observed, instead the cobaItcyclobutadiene Complex CpCo(eta (4)-C-4[Ph](4)) (9f) was formed. In the reactions with other alkynes, lower yields were obtained in general, except in the cyclotrimerisation of the highly activated alkyne, propargyl alcohol (b). Reaction of the non-activated alkynes, 1-hexyne (c) and 3-hexyne (d), produced complex mixtures of cobalt complexes in low yield in which the alkyne was coordinated to cobalt. Finally, the highly hindered diphenylacetylene (f) gave a mixture of the known Complexes CpCo(eta (4)-C-4[Ph](4)) (9f) and CpCo(eta (4)- C-4[Ph](4)CO) (6f) in agreement with the results observed in conventional organic solvents. (C) 2001 Elsevier Science B.V, All rights reserved.
Sp. Iss. SI474JKTimes Cited:21Cited References Count:43
Keywords: alkyne; cobalt metallocycles; cobaltacyclopentadiene; complexes; cpco(co)(2); cyclotrimerisation; cyclotrimerizations; homogeneous catalysis; hydrogenation; olefins; one-step; photochemistry; room-temperature; supercritical co2

Cloning of a novel Mo-Cu containing protein from Desulfovibrio.gigas - Di Rocco, G; Pereira, AS; Bursakov, SA; Gavel, OY; Rusnak, F; Lampreia, J; Moura, JJG; Moura, I (JOURNAL OF INORGANIC BIOCHEMISTRY, 2001)

Structural studies on Desulfovibrio desulfuricans ATCC 27774 multiheme nitrite reductase - characterization of the subunits - Goncalves, LML; Cunha, C; Almeida, G; Macieira, S; Costa, C; Lampreia, J; Romao, MJ; Moura, JJG; Moura, I (JOURNAL OF INORGANIC BIOCHEMISTRY, 2001)

Transition-metal-mediated activation of arylisocyanates in supercritical carbon dioxide - Montilla, F.; Clara, E.; Aviles, T.; Casimiro, T.; Ricardo, A. A.; da Ponte, M. N. (Journal of Organometallic Chemistry, 2001)
The reactivity of arylisocyanates in supercritical carbon dioxide (scCO(2)) was studied using the easily available complexes CpCo(CO)(2), CpCoPPh3Me2 and Ni(cod)(2) as catalysts. A study of the solubility of the catalysts in scCO(2) was undertaken in all cases. The complex CpCo(CO)(2) is very soluble, 1.7 x 10(-1) mol kg(-1), while CpCoPPh3Me2 has a lower solubility, 7.2 x 10(-3) mol kg(-1), and Ni(cod)(2) is insoluble in scCO(2). For comparison purposes, the reactions were performed in parallel in scCO(2), using toluene as a solvent and just with the neat liquid arylisocyanate. Reactions in scCO(2) either do not take place at all, when CpCo(CO), is used as catalyst, or occur with low yields affording the trimer of the corresponding arylisocyanate when CpCoPPh3Me2 or Ni(cod)(2) act as catalysts. No incorporation of CO2 into the organic substrate was observed. Better conversions to triarylisocyanate were obtained when the reactions were performed by direct mixture of the liquid arylisocyanate ArNCO (Ar = Ph, p-CH3C6H4, p-CH3OC6H4) and the catalyst. Using toluene as a solvent, the yields of the trimers were lower than those obtained in neat arylisocyanate, and in some cases they were not formed at all. For instance in the reaction of CpCo(CO), and tolylisocyanate either under stoichiometric or catalytic conditions the trimer is not obtained, instead the compound H2R3N3C2O2 (R = CH3C6H4), was isolated in low yield. In the reaction of Ni(cod)(2)/PPh3 with phenylisocyanate, the trimer was formed but in low yield. The lower yields of the trimers observed when the reactions were performed in scCO(2) or in toluene, compared to that observed in neat arylisocyanates, indicates that the decrease in reactivity is due to a decrease in concentration. (C) 2001 Elsevier Science B.V. All rights reserved.
430ZQTimes Cited:15Cited References Count:37
Keywords: aryl isocyanates; arylisocyanates; camptothecin; carbodiimide complexes; Catalysis; chemistry; co complexes; crystal-structures; cyclotrimerisation; cyclotrimerization; hydrogenation; ni complexes; phenyl isocyanate; polymerization; supercritical co2

Acoustic determination of the critical surface of {χ1CO2 + χ2C2H6 + (1 - χ1 - χ2)CHF3} - Ribeiro, N.; Aguiar-Ricardo, A.; Kordikowski, A.; Poliakoff, M. (Physical Chemistry Chemical Physics, 2001)
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Cited By (since 1996):9Export Date: 19 November 2013Source: Scopus

CpCo(CO)2-catalysed cyclotrimerisation of alkynes in supercritical carbon dioxide - Montilla, F.; Avilés, T.; Casimiro, T.; Ricardo, A. A.; Nunes Da Ponte, M. (Journal of Organometallic Chemistry, 2001)
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Cited By (since 1996):22Export Date: 19 November 2013Source: Scopus

A simple acoustic probe for fluid phase equilibria: Application to the CO2 + N(C2H5)3 system - Ribeiro, N.; Aguiar-Ricardo, A. (Fluid Phase Equilibria, 2001)
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Cited By (since 1996):8Export Date: 19 November 2013Source: Scopus

Experimental study of the F-19(p,alpha gamma)O-16 reaction - Ribeiro, J P; Jesus, A P; Braizinha, B.; Cruz, J.; R. Mateus; Pinto, JV (Nuclear Physics A, 2001)
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Times Cited: 06th International Conference on Nuclei in the Cosmos Jun 27-jul 01, 2000 Univ aarhus, aarhus, denmark Mateus, Rodrigo/A-4514-2013 Mateus, Rodrigo/0000-0001-6733-6359

Light scattering studies in cellulose derivative based PDLC type cells - Almeida, PL; Cidade, M.T.; Godinho, M. H.; Ribeiro, AC; Figueirinhas, J. L. (Taylor & Francis, 2001)
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The development of robot human-like behaviour for an efficient human-machine co-operation - Y. Rybarczyk; Galerne S.; Hoppenot P.; Colle E.; Mestre D. (6th Conference of the Association for the Advancement of Assistive Technology in Europe, 2001)

Time-Frequency and Time-Scale Characterisation of the Beat-by-Beat High-Resolution Electrocardiogram - Batista, AG; Rodrigues, J.M.; Ortigueira, M.D. (Sixth Portuguese Conference on Biomedical Engineering Proceedings, 2001)

Alterations in carbon and nitrogen metabolism induced by water deficit in the stems and leaves of Lupinus albus L - Pinheiro, C.; Chaves, M. M.; Ricardo, C. P. (Journal of Experimental Botany, 2001)
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Times Cited: 51 Ricardo, Candido/B-7891-2008; Pinheiro, Carla/A-4053-2008 Pinheiro, Carla/0000-0002-7799-0183 58

Alterations in carbon and nitrogen metabolism induced by water deficit in the stems and leaves of Lupinus albus L - Pinheiro, C.; Chaves, M. M.; Ricardo, C. P. (Journal of Experimental Botany, 2001)
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Cloning of a novel Mo-Cu containing protein from Desulfovibrio.gigas - Di Rocco, G; Pereira, AS; Bursakov, SA; Gavel, OY; Rusnak, F; Lampreia, J; Moura, JJG; Moura, I (Journal of Inorganic Biochemistry, 2001)
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Times Cited: 0 Di Rocco, G Pereira, AS Bursakov, SA Gavel, OY Rusnak, F Lampreia, J Moura, JJG Moura, I

Histomorphogenesis of embryos of Upper Jurassic theropods from Lourinhã (Portugal) - Ricqlès, A de; O. Mateus; Antunes, MT; Taquet, P (Comptes Rendus de l'Académie des Sciences-Series IIA-Earth and Planetary Science, 2001)
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Histomorphogenesis of embryos of Upper Jurassic theropods from Lourinhã (Portugal) | Histomorphogenèse du squelette d'embryons de dinosaures théropodes du Jurassique supérieur de Lourinhã (Portugal) - Ricqlès, A de; O. Mateus; Antunes, MT; Taquet, P (Comptes Rendus de l'Academie de Sciences - Serie IIa: Sciences de la Terre et des Planetes, 2001)
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Light scattering studies in cellulose derivative based PDLC type cells - Almeida, PL; Cidade, M.T.; Godinho, M. H.; Ribeiro, AC; Figueirinhas, J. L. (Molecular Crystals and Liquid Crystals, 2001)
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Materials and reconstruction techniques at the aqueduct of Carthage since the Roman period - Figueiredo, MO; Veiga, JP; Silva, TP; P.B. Lourenço; Roca, P (Historical constructions. Guimarães: Universidade do Minho, 2001)
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On generators and relations for unions of semigroups - Araújo, Isabel M.; Branco, Mário J. J.; Fernandes, Vitor H.; Gomes, Gracinda M. S.; Ruškuc, N. (Semigroup Forum, 2001)

Purification, crystallization and identification by X-ray analysis of a prostate kallikrein from horse seminal plasma - Carvalho, AL; Dias, JM; Sanz, L.; Romero, A.; Calvete, JJ; Romao, MJ (Acta Crystallographica Section D-Biological Crystallography, 2001)
The purification, crystallization and identification by X-ray diffraction analysis of a horse kallikrein is reported. The protein was purired from horse seminal plasma. Crystals belong to space group C2 and the structure was solved by the MIRAS method, with two heavy-atom derivatives of mercury and platinum. X-ray diffraction data to 1.42 Angstrom resolution were collected at the ESRF synchrotron-radiation source.
ISI Document Delivery No.: 455RV Times Cited: 2 Cited Reference Count: 31 Carvalho, AL Dias, JM Sanz, L Romero, A Calvete, JJ Romao, MJ MUNKSGAARD INT PUBL LTD COPENHAGEN Part 8
Keywords: CRYSTAL-STRUCTURE SERINE PROTEINASE BOVINE TRYPSIN SEMENOGELIN-I HUMAN-SEMEN ANTIGEN EXPRESSION FAMILY GENE REFINEMENT

Rational reprogramming of the R2 subunit of Escherichia coli ribonucleotide reductase into a self-hydroxylating monooxygenase - Baldwin, J.; Voegtli, W. C.; Khidekel, N.; Moenne-Loccoz, P.; Krebs, C; Pereira, AS; Ley, B. A.; HUYNH, BH; Loehr, T. M.; Riggs-Gelasco, P. J.; Rosenzweig, A. C.; Bollinger, J. M. (Journal of the American Chemical Society, 2001)
The outcome of O-2 activation at the diiron(II) cluster in the R2 subunit of Escherichia coli (class I) ribonucleotide reductase has been rationally altered from the normal tyrosyl radical (Y122)(1) production to self-hydroxylation of a phenylalanine side-chain by two amino acid substitutions that leave intact the (histidine)(2)-(carboxylate)(4) ligand set characteristic of the diiron-carboxylate family. Iron ligand Asp (D) 84 was replaced with Glu (E), the amino acid found in the cognate position of the structurally similar diiron-carboxylate protein, methane monooxygenase hydroxylase (MMOH). We previously showed that this substitution allows accumulation of a mu -1,2-peroxodiiron(III) intermediate,(2 3) which does not accumulate in the wild-type (wt) protein and is probably a structural homologue of intermediate P (H-peroxo) in O-2 activation by MMOH.(4) In addition, the near-surface residue Trp (W) 48 was replaced with Phe (F), blocking transfer of the "extra" electron that occurs in wt R2 during formation of the formally Fe(LII)Fe(IV) cluster X.(5-7) Decay of the mu1,2-peroxodiiron(III) complex in R2-W38F/D84E gives an initial brown product, which contains very little YI22(.) and which converts very slowly (t(1/2) similar to 7 h) upon incubation at 0 degreesC to an intensely purple final product. X-ray crystallographic analysis of the purple product indicates that F208 has undergone epsilon -hydroxylation and the resulting phenol has shifted significantly to become st ligand to Fe2 of the diiron cluster. Resonance Raman (RR) spectra of the purple product generated with O-16(2) or O-18(2) show appropriate isotopic sensitivity in bands assigned to O-phenyl and Fe-O-phenyl vibrational modes, confirming that the oxygen of the Fe(III)-phenolate species is derived from Or. Chemical analysis, experiments involving interception of the hydroxylating intermediate with exogenous reductant, and Mossbauer and EXAFS characterization of the brown and purple species establish that F208 hydroxylation occurs during decay of the peroxo complex and formation of the initial brown product. The slow transition to the purple Fe(LII)-phenolate species is ascribed to a ligand rearrangement in which mu -O2- is lost and the F208-derived phenolate coordinates. The reprogramming to F208 monooxygenase requires both amino acid substitutions, as very little epsilon -hydroxyphenylalanine is formed and pathways leading to Y122(.) formation predominate in both R2-D84E and R2-W48F(2-7).
Times Cited: 61 Baldwin, J Voegtli, WC Khidekel, N Moenne-Loccoz, P Krebs, C Pereira, AS Ley, BA Huynh, BH Loehr, TM Riggs-Gelasco, PJ Rosenzweig, AC Bollinger, JM

Relativistic and many-body effects on total binding energies of Cesium and other highly-charged ion - P. Indelicato; G. C. Rodrigues; E. Lindroth; M. A. Ourdane; F. Parente; J P Santos; P. Patté; J. Bieron (Physica Scripta, 2001)
The determination of atomic masses from highly ionized atoms using Penning Traps requires precise values for electronic binding energies. In the present work, binding energies of several ions (from several elements) are calculated in the framework of two relativistic many-body methods: Relativistic Many-Body Perturbation Theory (RMBPT) and Multi-Configuration Dirac– Fock (MCDF). The ions studied in this work are: Cl (He and Li-like), Se (F and Ne-like), Cs (He, Be, Ne, Al, Cl, Ar, K, Kr, Xe-like and neutral Cs), Hg, Pb and U (Br and Kr-like). Some of them are presented in this paper. Cesium has been treated in more details, allowing for a systematic comparison between MCDF and RMBPT methods. The Cs ions binding energies allow for the determination of atomic Cs mass, which can be used in a QED-independent fine structure constant determination.
JPS-Ref10

Relativistic Calculations for Trapped Ions - P. Indelicato; E. Lindroth; T. Beier; J. Bieron; A. M. Costa; I. Lindgren; J. P. Marques; Martenson-Pendrill, A M; M. C. Martins; M. A. Ourdane; F. Parente; P. Patté; et al. (Hyperfine Interactions, 2001)
We present recent results in the field of total binding energy calculations, Landщ factors, quantum electrodynamics corrections and lifetime that are of interest for ion traps and ion sources. We describe in detail MCDF and RMBPT calculation of ionic binding energies, which are needed for the determination of atomic masses from highly charged ion measurements. We also show new results concerning Landщ factor in 3-electron ions. Finally we describe how relativistic calculations can help understand the physics of heavy ion production ion sources.
JPS-Ref09

Silicon carbide alloys produced by hot wire, hot wire plasma-assisted and plasma-enhanced CVD techniques - Ferreira, I.; Costa, M.E.V.; Pereira, L.; Fortunato, E.; Martins, R.; Ramos, A.R.; Silva, M.F. (Applied surface science, 2001)
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Integration of resources and scheduling information for building and construction, linking IAI/IFC and ISO 13584 - Jardim-Goncalves R; Tavares R; Steiger-Garcao A; Grilo A (PRODUCT AND PROCESS MODELLING IN BUILDING AND CONSTRUCTION, 2000)
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Crystallization and preliminary X-ray analysis of a membrane-bound nitrite reductase from Desulfovibrio desulfuricans ATCC 27774 - Dias, JM; Cunha, CA; Teixeira, S; Almeida, G; Costa, C; Lampreia, J; Moura, JJG; Moura, I; Romao, MJ (ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY, 2000)
{Nitrite reductase from the sulfate-reducing bacterium Desulfovibrio desulfuricans ATCC 27774 is a multihaem (type c) membrane-bound enzyme that catalyzes the dissimilatory conversion of nitrite to ammonia. Crystals of the oxidized form of this enzyme were obtained using PEG and CaCl2 as precipitants in the presence of 3-(decylmethylammonium)propane-1-sulfonate and belong to the space group P2(1)2(1)2(1), With unit-cell parameters a = 78.94

Fisheries Development and Fisheries Dependent Communities in Portugal: Socio-Economic Change and Strategic Planning - Moniz, António; Kovács, Ilona; Vicente, Duarte; Ramos, Ana R. (University Library of Munich, Germany, 2000)
The socio-economic subsystem encompassing fisheries may be defined as including not only the harvesting sector but also several related activities occurring both upstream (shipbuilding, gear manufacture) and downstream (processing, distribution and trade). But these closely interrelated economic activities can also be set within a much broader system which would include the ecological, institutional and political influences which frame economic behaviour. The value of this broader conceptualisation is that it treats fisheries not as an isolated and independent economic activity but as part of a more holistic and complex system. This broader perspective is of particular significance when attempting to examine the concept of regional dependence. The socio-economic subsystem for fisheries is dominated by small and medium sized enterprises (SMEs). And Peniche emerges as one of Portugal’s most important fishing ports whether measured in terms of the volume of landings or the total numbers of fishermen. It also has one of the highest levels of fisheries dependence of all coastal municipalities in Portugal with over 20% of its workforce currently engaged in fisheries related employment, faces a daunting and uncertain future. The social fabric of fisheries dependent communities also suffers serious damage; once again, the technocratic approach to management has no solutions to offer. It is essential, therefore, to turn away from the existing approach and to develop instead new forms of intervention; in short, to provide a new vision. This implies change not only to the policy process but also in the attitudes of the social actors and in the preoccupations of fisheries related research. An integrated approach is required based on participative action and the development of an integrated information network.
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Keywords: dependent communities; Fisheries; Peniche; policy; Portugal; socio-economic system

Fuzzy versus classical methods comparison in ergonomics evaluations - Isabel L. Nunes; Rita A. Ribeiro (Ergonomia na Gestão pela Qualidade, 2000)
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The ERGO_X workstation analysis compared with other ergonomics tools - Isabel L. Nunes; Rita A. Ribeiro (XIV Triennial Congress of the International Ergonomics Association: Ergonomics for the New Millennium, 2000)
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Correlation of vapor-liquid equilibrium for carbon dioxide + ethanol + water at temperatures from 35 to 70°C - Duarte, C.; Aguiar-Ricardo, A.; Ribeiro, N.; Casimiro, T.; Nunes Da Ponte, M. (Separation Science and Technology, 2000)
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Cited By (since 1996):5Export Date: 19 November 2013Source: Scopus

Vapor-Liquid Equilibrium and Critical Line of the CO2 + Xe System. Critical Behavior of CO2 + Xe versus CO2 + n-Alkanes - Ribeiro, N.; Casimiro, T.; Duarte, C.; Nunes Da Ponte, M.; Aguiar-Ricardo, A.; Poliakoff, M. (Journal of Physical Chemistry B, 2000)
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Cited By (since 1996):13Export Date: 19 November 2013Source: Scopus

Preliminary results on UV and high temperature exposure effects on the electro-optical properties of cellulose derivatives based PDLC type cells - Almeida, PL; Cidade, M.T.; Godinho, M. H.; Ribeiro, AC; Figueirinhas, J. L. (Taylor & Francis, 2000)
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Knowledge Base of the Ergonomics Expert System ERGO_X - Isabel L. Nunes; Rita A. Ribeiro; Virgílio A. Machado (World Automation Conference-2000, 2000)
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Decomposição da amostra e estimação em difusões ergódicas - Luís Ramos (Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2000)
The required results of stochastic calculus are introduced as well as sufficient conditions for a diffusin to be ergodic. Invariant densities are obtained for two families of diffusion. These families belong the Ornstein-Uhlenbeck and Cox-Ingersoll & Ross diffusions. The moments of transition density of the Cox-Ingersoll & Ross diffusion were obtained and it was shown that this density converges to the invariant density. Lastly a technique, based on sample partition, is given for parameter estimation for ergodic diffusion. A numerical application of that technique for the Ornstein-Uhlenbeck diffusion is given. Final remarks and comments are included.