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81.
Summary The soleus, rectus femoris and gastrocnemius muscles of young rats were studied after 3, 6 and 12 weeks of treadmill training. The muscle fibers were characterized histochemically by their succinate dehydrogenase (SDH) and myofibrillar ATPase activity, and morphometrically by their cross-sectional areas, which were corrected for different body weights of control and trained animals.After 12 weeks of training the mean area of fibers in the muscles studied was not significantly different from the controls, as expected. In the soleus muscle the percentage of the fast-twitch fibers was decreased as a result of their transformation into slow-twitch fibers. Trained soleus muscles were the only muscles showing pathologically altered fibers, suggesting overload. The percentages of fiber types and their areas exhibited changes specific for the muscles and muscle regions studied.From these results it is concluded that the adaptation follows the sequence proportional adaptation of morphometrical parameters, disproportional adaptation of the areas of fiber types, and disproportional adaptation of the percentages and/or the areas of the fiber types. It is shown by comparison with the literature that this sequence may be generalized to a sequence of increasing expense necessary for the adaptation to increasing stimuli, and that the most decisive factors for adaptation are work load, frequency of exercise, period of training, and the age of the subject at the initiation of the training. 相似文献
82.
蔷薇科植物中山梨醇代谢酶的研究进展 总被引:6,自引:0,他引:6
蔷薇科植物中,与山梨醇代谢相关的酶主要有:6-磷酸山梨醇脱氢酶、山梨醇脱氢酶和山梨醇氧化酶。综述了近些年来国内外关于这几种酶的研究进展,涉及的内容有:酶的性质与作用、酶的活性变化与转录的关系,及其在生物技术方面的研究成果,并对今后的研究工作进行了展望。 相似文献
83.
L—山梨糖脱氢酶的纯化及性质的研究 总被引:10,自引:2,他引:10
从5L罐发酵L-山梨糖的Gluconibacter oxydans SCB329和Bacillus thuringiensis SCB933混合菌株中差速离心收集SCB329菌体,破碎,离心获得无细胞抽提液,硫酸铵分级沉淀蛋白后依次经DEAE Cellulose 52和Q Sepharose FF柱层析分得到了L-册梨糖脱氢酶(SDH),它能将L-册梨糖脱氢氧化为L-册梨酮,SDS-PAGE电泳测 相似文献
84.