Baumann F H, Baumann R
Respir Physiol. 1977 Dec;31(3):333-43. doi: 10.1016/0034-5687(77)90076-7.
Oxygen affinity and Bohr effect have been measured in the blood of four bird species (chicken, pigeon, Japanese quail and sparrow). Under physiological conditions (41 C, pH 7.5, PCO2 approximately 35 Torr) the oxygen half saturation pressure P50 are 50 Torr for the chickens, 38 Torr for the pigeon, 43 Torr for the Japanese quail and 44 Torr for the sparrow. Values for the physiological Bohr factors deltalogP50/deltapH are similar to those obtained in mammalian blood ranging from -0.57 in chicken blood to -0.42 for pigeon blood. A direct effect of CO2 on the oxygen affinity of chicken blood could not be observed, in agreement with results in hemoglobin solutions. However, at a constant pHpl of 7.5 the intracellular pH rise from 7.22 at 39 Torr PCO2 to 7.32 at PCO2 less than 1 Torr. This leads to a decrease of P50 at pHpl 7.5 from 52 to 46 Torr. A convincing correlation between body weight and P50 could not be established, even when including data from other authors. It is concluded that aside from metabolic rate, behavioural as well as environmental factors have influenced whole blood oxygen affinity during evolution.
已对四种鸟类（鸡、鸽、日本鹌鹑和麻雀）血液中的氧亲和力和玻尔效应进行了测定。在生理条件下（41℃、pH 7.5、二氧化碳分压约35托），鸡的氧半饱和压力P50为50托，鸽为38托，日本鹌鹑为43托，麻雀为44托。生理玻尔因子deltalogP50/deltapH的值与在哺乳动物血液中获得的值相似，范围从鸡血中的-0.57到鸽血中的-0.42。与血红蛋白溶液中的结果一致，未观察到二氧化碳对鸡血氧亲和力的直接影响。然而，在恒定pHpl为7.5时，细胞内pH从39托二氧化碳分压下的7.22升至二氧化碳分压小于1托时的7.32。这导致pHpl 7.5时P50从52托降至46托。即使纳入其他作者的数据，也无法在体重与P50之间建立令人信服的相关性。得出的结论是，除代谢率外，行为以及环境因素在进化过程中也影响了全血氧亲和力。
Zotero 插件