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cold environment    
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  寒冷环境
    The results showed: (1) i. c. v. administration of 6-OHDA (200μg) was found to cause a mild (5℃) reduction in body temperature at room temperature, a greater fall (7℃) in 5℃ cold environment.
    结果表明:(1)脑室注射200μg 6-OHDA产生一个短暂的急性低体温效应,在室温环境中体温下降幅度为5℃左右,在5℃寒冷环境中体温下降7℃左右。
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  低温环境
    Psychrophilic enzymes are produced by cold-adapted microorgamisms, and display a high enzymic activity in cold environment.
    适冷酶是由低温微生物产生的,在低温环境下具有较高的酶活性。
    The growth of Antarctic ice algae is suppressive at a temperature higher its suitable growth temperature, their mechanism and capacity to resist the thermal stress will restrict the survival of Antarctic ice algae, and their survival will threaten the biodiversity of polar ecosystem and the integrality of polar biological chain, so the effect of evolutional process in sustained cold environment on thermal acclimation mechanism of ice algae is the basis to understand the ecological effect of polar climate change on Antarctic ice algae.
    南极冰藻在高于生长适宜温度下生长受到抑制,抵抗高温胁迫的机制和能力制约着南极冰藻的生存,南极冰藻生存威胁到极地生态的生物多样性和极地生物链的完整性。 持续低温环境进化过程对极端适冷微藻热适应机理的影响是理解极地气候变化对南极冰藻生态影响的依据。
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  cold environment
In many applications of piezoelectrically controlled smart structures, the functionality of the system has to be ensured even in an extremely hot and cold environment.
      
Sympathetic denervation of IBAT prevented the effect of the cold environment on GABA content and impaired that on GABA accumulation.
      
Polar organisms should have mechanisms to survive the extremely cold environment.
      
A theoretical study shows that when a thermally thick sample is allowed to radiate instantaneously into a cold environment, then the resulting transient surface temperature depends solely on its hemispherical total emissivity and effusivity.
      
Survival of young and old rats in a cold environment
      
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In this paper, the anatomical identification of Linnaea borealis has been made. We presented the evidence that the plant has a good adaptaility to the environments in Changbai Mountains.Stem transvers show that the species can live in Changbai Mountains for many years.As one of the smallest bush plants in the world, it can resist the cold environment in Changbai Mountains, because it has special structures such as the special periderms, rays and pith.The cork in the thick periderms of roots and stems are...

In this paper, the anatomical identification of Linnaea borealis has been made. We presented the evidence that the plant has a good adaptaility to the environments in Changbai Mountains.Stem transvers show that the species can live in Changbai Mountains for many years.As one of the smallest bush plants in the world, it can resist the cold environment in Changbai Mountains, because it has special structures such as the special periderms, rays and pith.The cork in the thick periderms of roots and stems are made of big cube cells full of air. The cork cells play an important role in protecting the plant from heat. Many primary and secondary rays are observed in the secondary xylem. Each ray is made of one row parenchyma cells.The plant has bigger pith made of many bigger parenchyma's cells. The pith and ray cells can help the plant to store and transfuse the nutrient for growth.

本文对林奈木(Linnaea borealis L.)进行了解剖研究,证实林奈木系多年生小灌木,绝非半灌木。同时也弄清了该植物茎不能增粗和对高寒山区适应的原因。

The effects of intraventricular injection of 6-hydroxydopamine (6-OHDA) on the body temperature and thermoregulation were observed in the ground squirrel (Citellus dauricus). The results showed: (1) i. c. v. administration of 6-OHDA (200μg) was found to cause a mild (5℃) reduction in body temperature at room temperature, a greater fall (7℃) in 5℃ cold environment. The hypothermia recovered about 7 hours after administration of 6-OHDA at room temperature. (2) The acute hypothermia effect of 6-OHDA was abolished...

The effects of intraventricular injection of 6-hydroxydopamine (6-OHDA) on the body temperature and thermoregulation were observed in the ground squirrel (Citellus dauricus). The results showed: (1) i. c. v. administration of 6-OHDA (200μg) was found to cause a mild (5℃) reduction in body temperature at room temperature, a greater fall (7℃) in 5℃ cold environment. The hypothermia recovered about 7 hours after administration of 6-OHDA at room temperature. (2) The acute hypothermia effect of 6-OHDA was abolished by central pre-administration of phentolamine. This blockade suggested that the acute hypothermia was the result of endogenous catecholamine release after administration of 6-OHDA. (3) Despite the marked actue thermal response to 6-OHDA, there appers to be no long-lasting effect on the temperature regulatory center. The ground squirrels treated with 6-OHDA were able to keep constant body temperature in cold environment 20 hours after 6-OHDA administration.

观察了脑室注射6-OHDA对达乌尔黄鼠体温及体温调节能力的影响。结果表明:(1)脑室注射200μg 6-OHDA产生一个短暂的急性低体温效应,在室温环境中体温下降幅度为5℃左右,在5℃寒冷环境中体温下降7℃左右。脑室注射第二个剂量6-OHDA所引起的低体温效应比第一次明显减弱;中枢投入α-受体阻滞剂可以取消此低体温效应。(2)脑室注射6-OHDA对体温调节能力仅有暂时性影响,注药20小时后,体温调节能力即可恢复,动物在寒冷环境中和正常动物一样能够维持恒定的体温。这些观察结果为应用6-OHDA于冬眠实验工作提供了一个基本的参考依据。

Antifreeze peptide (AFP) produced in some animals is able to lower freezing temperature to prevent serum from freezing. There is a great potential to apply AFP in various circumstances wherever tolerance to cold environment is required. cDNA copies of AFP and proAFP coding sequence were synthesized according to the published sequence from a winter flounder (Pseudo-pleuronectes americanus). Expression of AFP or proAFP cDNA was initially tested in B. coli using a procaryotic expression vector. Level of the...

Antifreeze peptide (AFP) produced in some animals is able to lower freezing temperature to prevent serum from freezing. There is a great potential to apply AFP in various circumstances wherever tolerance to cold environment is required. cDNA copies of AFP and proAFP coding sequence were synthesized according to the published sequence from a winter flounder (Pseudo-pleuronectes americanus). Expression of AFP or proAFP cDNA was initially tested in B. coli using a procaryotic expression vector. Level of the expression was essentially low indicated by SDS-PAGE and protein staining procedures. In order to detect the low level expression, the AFP

动物抗冻肽(AFP)能降低动物体液冰点而使其能在寒冷的环境中生活,因而AFP在防寒抗冻方面有较大的应用潜力。根据美洲拟鲽AFP基因的cDNA序列,人工合成了AFP及其含前导序列的proAFP的cDNA,并构建成pAFP及pPAFP原核表达载体。由于AFP表达量少且蛋白分子很小,用SDS-蛋白电泳难以检测。为了提高检测的灵敏度,把报道基因CAT的cDNA按读码框连接到AFP的3′末端,构建成融合基因表达载体pAFP/CAT和pPAFP/CAT。在大肠杆菌表达系统JM109(DE 3)中诱导表达。结果表明,融合蛋白AFP/CAT和proAFP/CAT具有明显CAT活力。这表明AFP和proAFP可以在大肠杆菌中表达。

 
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