Significance of Affinity and Cooperativity in Oxygen Binding to Hemoglobin of Horse Fetal and Maternal Blood(Physiology)
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概要
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The physiological significance of the position and shape of the oxygen equilibrium curve (OEC) of horse hemoglobin (Hb) is considered from the viewpoint of oxygen (O_2) transport efficiency and the effectiveness of the Bohr effect. In horse fetal and maternal bloods, their physiological O_2 affinities are nearly optimized with respect to the effectiveness of the Bohr shift occurring at the O_2 release site, when it is measured by the change in O_2 saturation per unit change in P_<50>. With relatively low cooperativity (n=2.69) of horse Hb under physiological conditions, the effectiveness of the Bohr shift for fetal blood at O_2 uptake site and maternal blood at O_2 release site is high. These facts imply that the position and the cooperativity of horse Hb OEC are optimized to receive maximal benefit from the double Bohr shift. Before exercise, the position of the OEC for adult mares is nearly optimized for the effectiveness of the Bohr shift occurring at the O_2 release site, whereas, at maximal exercise, the position of the OEC tends to become advantageous for O_2 transport efficiency.
- 社団法人日本動物学会の論文
- 2003-09-25
著者
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Zhang Y
Graduate School Of Science And Technology Niigata University
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Imai K
Deparment Of Material Chemistry Faculty Of Engineering Hosei University
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Imai Kiyohiro
Department Of Physiology And Biosignaling Graduate School Of Medicine Osaka University
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Kobayashi M
Department Of Biology Faculty Of Science Niigata University
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Kobayashi Keiko
Graduate School Of Science And Technology Niigata University
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Zhang Yan
Graduate School of Science and Technology, Niigata University
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Kobayashi Michiyori
Department of Biology, Faculty of Science, Niigata University
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Sasagawa Keisuke
Graduate School of Science and Technology, Niigata University
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Kobayashi Makito
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Imai Kiyohiro
Deparment Of Material Chemistry Faculty Of Engineering Hosei University
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Kobayashi Kana
Faculty Of Letters Keio University
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Kobayashi K
Graduate School Of Humanities And Sciences Nara Women's University
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Kobayashi M
Epma Laboratory Niigata University Center For Instrumental Analysis
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Ishigaki K
Deparment Of Material Chemistry Faculty Of Engineering Hosei University
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Sasagawa Keisuke
Graduate School Of Science And Technology Niigata University
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Kobayashi M
Ishigaki Tropical Station Seikai National Fisheries Research Institute
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Zhang Yan
Graduate School Of Science And Technology Niigata University
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Kobayashi Michiyori
Department Of Biology Faculty Of Science Niigata University
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Zhang Yan
Graduate Program Of Human Sensing And Functional Sensor Engineering Graduate School Of Science And E
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Kobayashi K
Department Of Regulation Biology Faculty Of Science Saitama University
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