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Anisotropic gas diffusion in the shell membranes of the hen's egg

✍ Scribed by Ar, A. ;Girard, H.

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
638 KB
Volume
251
Category
Article
ISSN
0022-104X

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✦ Synopsis

The area-specific diffusive conductances for oxygen and carbon dioxide of the isolated eggshell compound membrane (CSM), in perpendicular direction (the shortest way between hard shell and chorioallantois), on day 16 of incubation, are 3.38 and 2.00 mmol/(cm2.d-kPa), respectively. Calculated Krogh constants of the CSM for oxygen (KO,) in lateral (parallel to the shell) and perpendicular (to the shell) directions show marked anisotropy in diffusive properties. The lateral KO, is about 100 times the perpendicular KO,. Analysis shows that eggshell pore density is closely structured to match the diffusive properties of the CSM, ensuring a quasihomogenization of gas pressures in the CSM among adjacent pores. During incubation regional Po, (and PCOJ changes within the CSM may occur as a result of covering relatively small fractions of eggshell. The CSM contributes little to the overall 0, transport resistance in the live egg.

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