Linked Life Data

18514558

Source:http://linkedlifedata.com/resource/pubmed/id/18514558

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2008-6-16
pubmed:abstractText
Thermal effects on the blood respiratory properties of southern bluefin tuna (Thunnus maccoyii) at 10, 23 and 36 degrees C, and at 0.5 and 1.5% CO(2) were investigated. A reversed temperature effect occurred as the oxygen partial pressure required for 50% haemoglobin saturation (P(50)) at 0.5% CO(2) decreased from 2.9 kPa at 10 degrees C to 1.7 kPa at 23 degrees C (apparent heat of oxygenation, DeltaH degrees , =+27 kJ mol(-1)). However, oxygen binding was essentially independent of temperature at warmer temperatures (P(50)=1.7-2.0 kPa from 23-36 degrees C at 0.5% CO(2); DeltaH degrees =-6.5 kJ mol(-1)). Hill's coefficient (n(H)) ranged from 1.3 to 1.6, and there was a large effect of temperature on the Bohr factor (DeltalogP(50)/DeltapH=-1.6 at 10 degrees C and -0.9 at 36 degrees C). This is the first study of whole blood to demonstrate the thermal dependence of DeltaH degrees itself, whereby the oxygen equilibrium curve is more sensitive to temperature in the lowest thermal range examined. We suggest that the functional basis for these observations lies in the necessity to ensure a sufficient oxygen supply to all tissues, including the heart and liver, without suffering from premature or excessive oxygen unloading around the heat exchanger prior to delivery of oxygen to organs and tissues that lie efferent to the exchanger.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1531-4332
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
150
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
239-46
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Thermal effects on the blood respiratory properties of southern bluefin tuna, Thunnus maccoyii.
pubmed:affiliation
School of Earth and Environmental Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia. timothy.clark.mail@gmail.com
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't