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【期刊论文】STUDIES OF THE MATHEMATICAL MODEL FOR POSTNATAL DEVELOPMENT OF THERMOREGULATION
孙儒泳, CAI BING and SUN RUYONG
J. therm. Biol. Vol. 12, No. 3, pp. 189-193, 1987,-0001,():
-1年11月30日
This paper deals with the developmental process of thermoregulation. From an ecologicalp oint of view, it establishes a mathematical model for postnatal development of thermoregulation, and proposes a new index of homeothermy ability. The model is used to predict homenthermy ability at any time of postnatal development for root vole and other species.
Index-Thermoregulation, mathematical model, mammals, development, thermoregulation.,
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孙儒泳, SUN RU-YUNG and ZE'NG JINXlANG
J. therm. Biol. Vol. 12, No. 4, pp. 267-272, 1987,-0001,():
-1年11月30日
l. Oxygen consumption and body temperatures of 32 juvenile root voles (Microtus oeconomus) of different ages (in days) were measured at ambient temperatures (Ta) of 10, 20 and 30
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孙儒泳, Xiao-tuan Liu, Qi-shui Lin, Qing-fen Li, Chen-xi Huang, Ru-yong Sun
Comparative Biovhemistry and Physiology Part A 120(1998)745-752,-0001,():
-1年11月30日
The mRNA level of uncoupling protein (UCP) specific for brown adipose tissue (BAT) in Daurian ground squirrel, was detected by using a [32P]-labeled oligonucleotide probe. The UCP concentration in mitochondria was indirectly determined by titration with its specific ligand [3H]-labeled GTP. Type II T4 5′-deiodinase of BAT was assayed concomitantly. We found two species of mRNA for UCP with lengths of about 1.9 and 1.5 kb, respectively, both occurring in almost the same concentration. UCP mRNA content was elevated significantly during hibernation, but the UCP concentration did not change compared with that of nonhibernating controls kept at room temperature. When hibernating squirrels were aroused, the UCP mRNA remained at the elevated level as during hibernation, but the UCP concentration increased in comparison with that of nonhibernating controls or during hibernating. Changes in T4 5′-deiodinase activity in BAT were similar to the variations of the UCP mRNA level. These results suggest that the activation of T4 5′-deiodinase in BAT may be an important factor for the up-regulation and maintenance of UCP mRNA content needed for the synthesis of sufficient UCP to acquire the thermogenic capacity for arousal from hibernation. © 1998 Elsevier Science Inc. All rights reserved.
Arousal, Brown adipose tissue, Daurian ground squirrel, GTP-binding to mitochondria, Hibernation, mRNA for uncoupling protein, Nonshivering thermogenesis, T4 5′-deiodinase
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孙儒泳, D. Wang, R. Sun, Z. Wang, J. Liu
J Comp Physiol B(1999)169: 77-83,-0001,():
-1年11月30日
We examined the effects of temperature and photoperiod on metabolic thermogenesis and the thermogenic characteristics of brown adipose tissue in plateau pikas (Ochotona curzoniae) and root voles (Microtus oeconomus), the dominant species of small mammals in the alpine meadow ecosystems on the Qinghai-Tibetan Plateau. Pikas and voles were acclimated in the following groups: (1) Long day-warm temperature (16L:8D, 23
Acclimation, Mitochondria, Plateau pika, Root vole, Thermogenesis
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【期刊论文】Cold adaptive thermogenesis in small mammals from different geographical zones of China
孙儒泳, Qingfen Li, Ruyong Sun, Chenxi Huang, Zhengkun Wang, Xiaotuan Liu, Jianjum Hou, Jinsong Liu, Liquan Cai, Ning Li, Shuzhen Zhang, Yu Wang
Comparative Biochemistry and Physiology Part A 129(2001)949-961,-0001,():
-1年11月30日
The mechanisms of thermogenesis and thermoregulation were studied in the tree shrew (Tupaia belangeri) and greater vole (Eothenomys miletus) of the subtropical region, and Brandt’s vole (Microtus brandti), Mongolian gerbil (Meriones unguiculatus), Daurian ground squirrel (Spermophilus dauricus) and plateau pika (Ochotona curzoniae) of the northern temperate zone. Resting metabolic rate (RMR) and non-shivering thermogenesis (NST) increased significantly in T. belangeri, E. miletus, M. brandti and M. unguiculatus after cold acclimation (4ºC) for 4 weeks. In T. belangeri, the increase in RMR and thermogenesis at liver cellular level were responsible for enhancing the capacity of enduring cold stress, and homeothermia was simultaneously extended. Stable body temperature in M. brandti, E. miletus, M. unguiculatus and O. curzoniae was maintained mainly through increase in NST, brown adipose tissue (BAT) mass and its mitochondrial protein content, and the upregulation of uncoupling protein (UCP1) mRNA, as well as enhancement of the activity of cytochrome C oxidase, α-glycerophosphate oxidase and T4 5′-deiodenase in BAT mitochondria. The RMR in O. curzoniae and euthermic S. dauricus was not changed, while NST significantly increased during cold exposure; the former maintained their stable body temperature and mass, while body temperature in the latter declined by 4.8ºC. The serum T3concentration or ratio of T3/T4 in all the species was enhanced after cold acclimation. Results indicated that: (1) the adaptive mechanisms of T. belangeri residing in the subtropical region to cold are primarily by increasing RMR and secondly by increasing NST, and the mechanisms of thermogenesis are similar to those in tropical mammals; (2) in small mammals residing in northern regions, the adaptation to cold is chiefly to increase NST; (3) the mechanism of cold-induced thermogenesis in E. miletus residing in subtropical and high mountain regions is similar to that in the north; (4) a low RMR in warm environments and peak RMR and NST in cold environments enabled M. unguiculatus to tolerate a semi-desert climate; (5) O. curzoniae has unusually high RMR and high NST, acting mainly via increasing NST to adapt to extreme cold of the Qinghai-Tibet Plateau; (6) the adaptation of euthermic S. dauricus to cold is due to an increase in NST and a relaxed homeothermia; and lastly (7) the thyroid hormone is involved in the regulation of cold adaptive thermogenesis in all the species studied. © 2001 Elsevier Science Inc. All rights reserved.
Small mammal, Resting metabolic rate, Liver, Mitochondria, Non-shivering thermogenesis, Brown adipose tissue, Uncoupling protein mRNA, Thyroid hormone
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