<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Faria, David P</style></author><author><style face="normal" font="default" size="100%">Fonseca, Ana L</style></author><author><style face="normal" font="default" size="100%">Pereira, Helen</style></author><author><style face="normal" font="default" size="100%">Teodoro, Orlando M. N. D.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">{Permeability of cork to gases}</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of agricultural and food chemistry</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Gases</style></keyword><keyword><style  face="normal" font="default" size="100%">permeability</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.ncbi.nlm.nih.gov/pubmed/21434693</style></url></web-urls><related-urls><url><style face="normal" font="default" size="100%">https://docentes.fct.unl.pt/sites/default/files/odt/files/2011_permeability_of_cork.pdf</style></url><url><style face="normal" font="default" size="100%">https://docentes.fct.unl.pt/sites/default/files/odt/files/2011_permeability_of_cork_0.pdf</style></url></related-urls></urls><number><style face="normal" font="default" size="100%">8</style></number><volume><style face="normal" font="default" size="100%">59</style></volume><pages><style face="normal" font="default" size="100%">3590–3597</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The permeability of gases through uncompressed cork was investigated. More than 100 samples were assessed from different plank qualities to provide a picture of the permeability distribution. A novel technique based on a mass spectrometer leak detector was used to directly measure the helium flow through the central area of small disks 10 mm in diameter and 2 mm thick. The permeability for nitrogen, oxygen, and other gases was measured by the pressure rise technique. Boiled and nonboiled cork samples from different sections were evaluated. An asymmetric frequency distribution ranging 3 orders of magnitude (roughly from 1 to 1000 $μ$mol/(cm·atm·day)) for selected samples without macroscopic defects was found, having a peak below 100 $μ$mol/(cm·atm·day). Correlation was found between density and permeability: higher density samples tend to show lower permeability. However, boiled cork showed a mean lower permeability despite having a lower density. The transport mechanism of gases through cork was also examined. Calculations suggest that gases permeate uncompressed cork mainly through small channels between cells under a molecular flow regime. The diameter of such channels was estimated to be in the range of 100 nm, in agreement with the plasmodesmata size in the cork cell walls.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;n/a&lt;/p&gt;
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