Lower temperature. Physics refers to the -263 ℃ -192 ℃ temperature of liquid air.
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dī wēn
Low temperature
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No. 3
Often a result of lower than normal body temperature of man in order to facilitate cardiac surgery
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Application of Low Temperature Biology
Cryogenic plant growth, development and geographical distribution of important factors. The study found a large number of cold-inducible expression of many genes, according to the protein product of gene expression can be divided into functional protein coding genes and gene regulatory proteins into two categories. Hypothermia is one of the important environmental factors limiting plant growth, development and geographical distribution. Most tropical and subtropical plants due to lack of ability to adapt to low temperature, when the ambient temperature is below 10 ℃ will be harmed, seriously affected the normal plant growth, development and even cause death. Distributed in the temperate regions of the plant, in the warm season rather weak resistance against freezing. However, with the change of seasons, the temperature is gradually reduced, the resistance of plants to freezing gradually increased. In the non-frozen after a period of low growth environment, the ability of plants to enhance the antifreeze, which can withstand freezing temperatures occur immediately, and this adaptation process is known as cold acclimation (cold acclimation). Depending on the type of plant, the maximum frost resistance of cold acclimation time from several days to several weeks ranging from different types of plants can withstand temperatures to -60 ℃ -10 ℃ below. Thus, cold acclimation is an effective way to improve plant frost resistance. Cold acclimation is a very complex process. Researchers around the world around the various changes of physiological and biochemical and molecular level during the cold acclimation of plants that occur a lot of research. The latest research indicates that at least 300 cold-responsive genes involved in cold acclimation process. For such a complex process of adaptation, a fundamental goal of cold acclimation research is the separation and identification of frost resistance plays a key role in improving the low temperature responsive genes. As the mutation analysis and molecular genetics large number of applications, as in the model plant Arabidopsis thaliana, has been cloned and a number of low-temperature low-temperature-responsive genes regulated transcription factor gene, a clear and frost various functions of these genes involved low temperature regulating signal transduction pathway. According cold response gene protein product can be divided into two categories: one is directly protect cells from stress damage the function of the protein; Another is to pass signals and regulation of gene expression regulatory proteins.
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Encyclopedia
Hypothermia hypothermia Low temperature of brain tissue hypoxia tolerance increased significantly. When the temperature is below 37 ℃, reduce per 1 ℃, brain tissue metabolic rate decrease of 6.7%, 5.5% in reducing intracranial pressure, artificial respiration, cardiac massage should be given at the same time or later temperatures, so that the temperature can be formal hibernation therapy Rectal temperature fell to about 35 ℃, particular attention is currently the head of local cooling, wearing ice caps, head temperature dropped to about 32 ℃, severe to cool for 3 to 5 days.