S. H. Wright (auth.)'s Advances in Comparative and Environmental Physiology PDF

By S. H. Wright (auth.)

ISBN-10: 3642733751

ISBN-13: 9783642733758

ISBN-10: 3642733778

ISBN-13: 9783642733772

Advances in Comparative and Environmental Physiology offers finished, built-in experiences giving sound, severe, and provocative summaries of our current wisdom in environmental and comparative body structure, from the molecular to the organismic point. the sphere has now received the foreign prestige it merits and the association of a sequence dedicated to it's very well timed in view of its genuine swift improvement. Biologists, physiologists, and biochemists, independently in their uncomplicated clinical orientation, will locate this new sequence of significant interest.

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5 ml in all cases. The results were quite consistent for both series of experiments. To summarize, 13-lined ground squirrels entered hibernation quite readily in the summer after each and every of the above treatments; the rate of occurrence of hibernation ranged from 780/0 after sham injection to 86% each after warm saline, fresh summer active plasma, and fresh hibernating plasma, respectively. There was no difference in the time delay prior to onset of hibernation after each treatment; the average was as short as 3 days (range = 1 - 33) after cold saline to 18 days (range = 4 - 40) after warm saline with hibernating plasma averaging 5 - 7 days (range = 1 - 21) and summer active plasma 6 - 13 days (range = 1 - 34) after treatment.

1986). Historically, Tc has been viewed as a critical temperature below which, a thermotropic lipid phase transition occurs in bulk membrane lipids from the liquidcrystalline to the gel phase (Raison and Lyons 1971). Because liver mitochondrial respiration shows a Tc at 23 °C in summer active ground squirrels but below 40 C in winter hibernating animals, a hypothesis has thus been advanced that a prerequisite for hibernation is the alteration of membrane lipids such that the membrane fluidity is increased at low temperature so as to allow continuing function of membrane enzymes during hibernation (Raison and Lyons 1971).

1986). The succinate-stimulated mitochondrial proton ejection, calcium uptake, and oxygen consumption in spring, summer, and winter active (20° and 4°C-acclimated) Richardson's ground squirrels are nonlinear but become linear in hibernating and aroused animals (Pehowich and Wang 1984). Interestingly, winter active animals (either 20° or 4 °C-acclimated) which do not show weight gain (presumably in their nonhibernating phase) exhibit nonlinear Arrhenius plots but with decreased Tc's of 11 ° -13 °C from the 21°C seen in summer squirrels (Fig.

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Advances in Comparative and Environmental Physiology by S. H. Wright (auth.)

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