In:
Canadian Journal of Zoology, Canadian Science Publishing, Vol. 72, No. 12 ( 1994-12-01), p. 2169-2171
Abstract:
The Adair constants for Daphnia magna hemoglobin (Hb) oxygen equilibrium curves (OECs) were determined, and the fractional oxygen saturation (Y) was differentiated in terms of partial O 2 pressure (p), for Hb-rich (Y R ) and for Hb-poor (Y P ) animals. Y′ (dY/dp), which depends on loading and unloading p values of Hb, is used to estimate O 2 transport efficiency. The ratio of the Y′ values (Y′ R /Y′ P ) peaked (2.9) at a value close to the p 50 of Hb R . Using two OECs (Y I and Y II ) for monocomponent human adult Hb A, which have similar O 2 affinities to Hb R and Hb P , respectively, a markedly high ratio of differential coefficients (Y′ I /Y′ II ) was obtained. It is therefore considered that the occurrence of multiple Hb's showing an inverse correlation between Hb concentration and p 50 , as in D. magna, minimizes the total Hb concentration required for adaptation to a wide range of O 2 conditions.
Type of Medium:
Online Resource
ISSN:
0008-4301
,
1480-3283
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
1994
detail.hit.zdb_id:
1490831-1
SSG:
12
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