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https://hdl.handle.net/2440/51953
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Type: | Journal article |
Title: | Non-invasive measurement of oxygen partial pressure, lateral diffusion and chorioallantoic blood flow under the avian eggshell |
Author: | Seymour, R. Wagner-Amos, K. |
Citation: | Comparative Biochemistry and Physiology Part A: Molecular and Integrative Physiology, 2008; 150(2):258-264 |
Publisher: | Elsevier Science Inc |
Issue Date: | 2008 |
ISSN: | 1095-6433 1531-4332 |
Statement of Responsibility: | Roger S. Seymour and Kerstin Wagner-Amos |
Abstract: | We measured P(O2) under the shell of avian eggs indirectly, by sealing 0.05 mL glass tubes to the shell, sealing them with mercury and using an oxygen microelectrode to measure the contained gas that equilibrates with the gas in the shell membranes. This technique requires a smaller area of contact with the shell and a shorter equilibration period than established techniques, and allows measurements at several locations simultaneously and over a long period of time without endangering the embryo. P(O2) under the shell of chicken eggs decreased to 14.3 kPa on the day before hatching (day 19). P(O2) was unstable during late development and differences up to 3.1 kPa occurred transiently on opposite sides of the equator. By waxing the shell around sampling tubes, we estimated Krogh's coefficient for lateral oxygen diffusion in the shell membranes at 1.1 mmol cm(-1) d(-1) kPa(-1), a value about a third of a previous estimate. Sampling of gas under sufficiently large regions of waxed shell allowed indirect measurements of chorioallantoic venous P(O2), without affecting embryonic respiration. Venous P(O2) was 3.8 kPa on day 19. Assuming 14.3 kPa represents arterialized blood leaving the chorioallantois, it became possible to calculate the effective chorioallantoic blood flow rate, which was 3.5 mL min(-1) on day 19. |
Keywords: | Chorioallantoic Membrane Egg Shell Animals Chickens Oxygen Diffusion Partial Pressure Thermal Conductivity |
Description: | Copyright © 2006 Elsevier Inc. All rights reserved. |
DOI: | 10.1016/j.cbpa.2006.05.013 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/525464/description#description |
Published version: | http://dx.doi.org/10.1016/j.cbpa.2006.05.013 |
Appears in Collections: | Aurora harvest 5 Earth and Environmental Sciences publications |
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