The relationship among metabolic rate of tree shrews (Tupaia belangeri) under cold acclimation
Journal Title: Журнал ÑтреÑÑ-физиологии и биохимии - Year 2012, Vol 8, Issue 4
Abstract
Many small mammals inhabiting cold environments display enhanced capacity for seasonal changes in nonshivering thermogenesis (NST) and thermoregulatory maximum metabolic rate (MMR). However, it is not known how this plasticity remains in a mammal that rarely experiences extreme cold fluctuations. In order to answer this question, we determined body mass ( Mb), basal metabolic rate (BMR), NST, and MMR on a tree shrews ([i]Tupaia belangeri[/i]), acclimated to cold (5 єC) conditions. NST was measured as the maximum response of metabolic rate (NSTmax) after injection of norepinephrine (NE) in thermoneutrality minus BMR. Maximum metabolic rate was assessed in animals exposed to enhanced heat-loss atmosphere (He-O[sub]2[/sub]) connected with an open-flow respirometer. Body mass and metabolic variables increased significantly after cold acclimation with respect to control group but to a high extent (BMR, 87.97%; NST, 69.77%; and MMR, 32.35%). However, aerobic scope (MMR/BMR), and calculated shivering thermogenesis (ST) did not significantly change with control group. Our data suggest: 1). The body mass and the capacity of heat production in the cold acclimated group were higher; 2). The increase of BMR and MMR during cold acclimation was the main pattern of heat production in the tree shrews.
Authors and Affiliations
Lin Zhang, Wenrong Gao, Wenxiu Jiang, Zhengkun Wang
Keywords
Related Articles
- EP ID EP130249
- DOI -
- Views 90
- Downloads 0
24-Epibrassinolide ameliorates the adverse effect of salt stress (NaCl) on pepper (Capsicum annuum L.)
The present study investigates the role of 24-epibrassinolide (EBL) in inducing plant tolerance to salinity. Seedlings of pepper ([i]Capsicum annuum[/i] L.) were grown in the presence of 70 mM NaCl and were sprayed with...
Phenotypic Traits of Arabidopsis Plants Deficient in RpoTmp RNA Polymerase
In Arabidopsis, three nuclear-encoded RNA polymerases participate in the transcription of organellar genes. RpoTmp is a RNA polymerase that localizes both in mitochondria and chloroplasts, but is involved predominantly...
Repetitive Measurements of Physiological pH by Implantable Optical Sensors in Muscles of adult Danio rerio: Preliminary Results
Encapsulated optical sensors are promising tool for measurements of physiological parameters inside living organisms. In the present study we tested the possibility to apply encapsulated fluorescent sensors to measure pH...
Antioxidative Defense Responses to lead-induced Oxidative Stress in Glycine max L. cv. Merrill grown in Different pH Gradient
Physiological and biochemical changes as well as the activities of anti-oxidative enzymes under lead (Pb[sup]2+[/sup]) phytotoxicity were investigated in 20 days old soybean (Glycine max L.) seedlings grown hydroponicall...
СВЕТОЗАВИСИМЫЕ ИЗМЕНЕНИЯ ГЕНЕРАЦИИ ПЕРОКСИДА ВОДОРОДА И АКТИВНОСТИ ПЕРОКСИДАЗ ПРОРОСТКОВ ПШЕНИЦЫ
Выявлено участие света в модификации активности пероксидазной ферментной системы внутриклеточного компартмента побегов и корней проростков пшеницы и генерации пероксида водорода. Показано, что в надземных частях проростк...