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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The effect of environmental variables on the structure and function of hemocyanin fromCallianassa californiensis (1981)
    Springer
    Journal of comparative physiology 143 (1981), S. 253-260 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Callianassa californiensis has two hemocyanins present in the blood, a 39 S form and a 17 S form. It does not regulate major blood ions with decreasing salinity, thus the ion levels can drop dramatically in winter when estuarine seawater becomes more dilute. Its hemocyanin shows remarkably little functional change when salinity is reduced from 35‰ to 17.5‰. At normal blood pH (∼ 8.2 at 10°C) the affinity decreases from 2.5 to 4.5 mm Hg with lowered salinity. The Bohr effect curves at both salinities have a complex biphasic shape with an average slope of −1.59, but they differ in affinity so they are parallel through the pH range 7.0 to 9.0. Cooperativity remains the same at every pH for the two Bohr series with maximumn H≅3.5 at physiological pH. There is no change in blood pH at low salinity. The 39 S and 17 S hemocyanins have similar affinities but the cooperative behavior is different. Adding NaCl and KCl to physiological levels slightly decreases affinity compared to MgCl2 and CaCl2 alone. Lowering temperature increases affinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00797705
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of environmental variables on the structure and function of hemocyanin fromCallianassa californiensis (1981)
    Springer
    Journal of comparative physiology 143 (1981), S. 261-267 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Callianassa, an estuarine animal, can experience changes in salinity which reduce the level of divalent cations in the blood, as well as changes in temperature and variations in protein concentration in the hemolymph. The hemocyanin in whole hemolymph shows evidence of dissociation (∼ 12%) after 3 days acclimation to 40% seawater. Using purified hemocyanin the dissociation from 39 S to 17 S hemocyanin was investigated for the three variables, salinity, temperature and protein concentration. An equation was developed to define the amount of dissociation which should be observed under physiological conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00797706
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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