dc.contributor.author | Johansen, Kjell | |
dc.contributor.author | Lykkeboe, Gunnar | |
dc.contributor.author | Kornerup, Sonja | |
dc.contributor.author | Maloiy, GMO | |
dc.date.accessioned | 2013-07-25T09:14:56Z | |
dc.date.available | 2013-07-25T09:14:56Z | |
dc.date.issued | 1980 | |
dc.identifier.citation | Journal of comparative physiology 1980, Volume 136, Issue 1, pp 71-76 | en |
dc.identifier.issn | 1432-1351 | |
dc.identifier.uri | http://link.springer.com/article/10.1007/BF00688625 | |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/51054 | |
dc.description.abstract | Respiratory gas exchange and blood respiratory properties have been studied in the East-African tree frogChiromantis petersi. This frog is unusually xerophilous, occupies dry habitats and prefers body temperatures near 40°C and direct solar exposure. Total O2 uptake was low at 81 μl O2·g−1·h−1±19.0 (SD) at 25°C increasing to 253.5 μl O2·g−1·h−1±94.8 (SD) at 40°C giving aQ 10 value of 2.1. Skin O2 uptake at 25°C was 38.5% of total. The gas exchange ratio was 0.71 for whole body gas exchange, 0.61 for the lungs and 1.02 for the skin at 25°C.
Blood O2 affinity was low with aP 50 of 47.5 mmHg at 25°C and pH 7.65. Then H-value at 25°C increased from 2.7 aroundP 50 to 5.0 at O2 saturations exceeding 70–80%. Surprisingly, blood O2 affinity was nearly insensitive to temperature expressed by a ΔH value of ±1.0 kcal·mole between 25 and 40°C.
The adaptive significance of the low O2 affinity, the increase ofn H with O2 saturation and the temperature insensitive O2-Hb binding is discussed in relation to the high and fluctuating body temperatures ofChiromantis | en |
dc.language.iso | en | en |
dc.publisher | Springer-Verlag | en |
dc.subject | Biomedicine general | en |
dc.subject | Human Physiology | en |
dc.subject | Biochemistry, general | en |
dc.subject | Zoology | en |
dc.subject | Animal Physiology | en |
dc.title | Temperature insensitive O2 in blood of the tree frogChiromantis petersi | en |
dc.type | Article | en |
local.publisher | Department of Zoophysiology, University of Aarhus, DK-8000, Aarhus C., Denmark | en |
local.publisher | Comparative Animal Physiology Research Unit, University of Nairobi, | en |