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Differences in the thermal behavior of myo cardial membranes relative to hibernation

, : Differences in the thermal behavior of myo cardial membranes relative to hibernation. Comparative Biochemistry & Physiology B 69(2): 169-174

Phase transitions and changes in the molecular ordering of membrane lipids were detected by differential scanning calorimetry (DSC) and spin labeling using myocardial membranes from summer-active and winter-hibernating ground squirrels (Spermophilus richardsonii), dog (Canis familiaris) and trout (Salmo gairdnei). Two phase transitions, one at C and the other at C, were detected by DSC in the membranes from the dog, whereas only 1 transition was found in the membranes from the ground squirrel. This was at C in membranes from summer-active animals but was at C in membranes from winter- hibernating squirrels. No transition was detected in membranes from cold water, adapted trout. Spin labeling showed changes in lipid ordering at about the same temperature as the thermal transitions detected by DSC except in the membranes from the dog where only the transition at C was observed. The membrane lipids from the winter-hibernating squirrel contained a higher proportion of unsaturated fatty acids than those of the summer-active squirrel. The transition at C in membranes from dog correlates with the reported temperature for the loss of cardiac function during hypothermia and suggests a causal relationship between the thermal response of membrane lipid structure and cardiac function. The absence of a transition at C in the membranes of the summer-active ground squirrel is consistent with the ability of this animal to maintain rhythmic heart beat at tissue temperatures near C.

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Accession: 005151644

DOI: 10.1016/0305-0491(81)90226-1

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Other references

Wealthall, S., 1995: Labelling of health professionals--a hazard to a healthy health system?. New Zealand Medical Journal 108(995): 88-88

Yen S C.; Fang Y T., 1976: Natural leaching effect on salt affected soils in taiwan part 1 land with open drainage system. Report of the Taiwan Sugar Research Institute 74: 15-25

Lee,R.; Lovatelli,A.; Ababouch,L., 2008: Bivalve depuration fundamental and practical aspects. Bivalve molluscan shellfish concentrate contaminants from the water column in which they grow. These contaminants may then cause illness to humans when the bivalves are eaten. For microbial contaminants, the risk is enhanced by the fact that these...

Anonymous, 2013: Side effects of TNF-? blockers in patients with psoriatic arthritis evidences from literature studies. Psoriatic arthritis is an inflammatory rheumatic disorder, which occurs in patients with skin and/or nail psoriasis. In psoriatic arthritis, the importance of biologic mediators modulating inflammatory reaction, such as tumor necrosis factor, and...

King, M.A.; Weber, D.A.; Casarett, G.W.; Burgener, F.A.; Corriveau, O., 1980: Irradiated bone 2. changes in technetium 99m pyro phosphate bone imaging. Quantitative Tc-99m pyrophosphate [TcPPi] bone imaging was carried out in locally irradiated and control areas of New Zealand albino rabbits to determine the potential role of bone imaging in assessing the time course of radiation effects in bone...

Asou H.; Kanamatu T.; Takagi Y.; Turumizu T.; Hirano S., 1981: Uptake of chlorine 36 into cultured neuronal cells. Journal of the Physiological Society of Japan 43(8-9): 276

Pagon, S.; Alther, E.W.; Rohde, R., 1974: Isolation and identification of a new Salmonella species from sewage S. bazenheid equals 8,20:z 10:1,2. Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Erste Abteilung Originale. Reihe A: Medizinische Mikrobiologie und Parasitologie 229(2): 273-276

Haba, K., 1922: On Witches' Broom of the Sasa spiculosa.. A new witches' broom is described and figured on the Sasa bamboo. The English diagnosis is as follows: Epichloe sasae Hara n. sp. Stroma surrounding the young sheath, cylindrical or conical, pointed at the top, 1.5 to 4 cm. long, 3 to 5.5 mm....

Golovchenko, E.A.; Pilipetskii, A.N.; Menyuk, C.R., 1996: Minimum channel spacing in filtered soliton wavelength-division-multiplexing transmission. We study a soliton transmission line with sliding-frequency filters, and we determine the limits on soliton stability imposed by the value of the free spectral range of Fabry-Perot étalon filters. From these limits, we infer the minimum channel s...

Fender, D.H., 1964: Contact Lens Stability. Biomedical Sciences Instrumentation 2: 43-52