递增负荷运动过程中ER、PR水平的变化及其与性腺类固醇的关系   总被引：2，自引：0，他引：2  

郑陆  隋波  潘力平  李晔  沈东颖  王娟  林晓光  王明燕  段平 《山东体育学院学报》2005,21(5):54-57,61

低性腺类固醇水平是AMi的重要特征之一.为了探讨低性激素环境下ER（雌激素受体）、PR（孕激素受体）的变化特点及激素与受体间的相互影响作用关系，并探讨其在运动性月经失调中的作用机制，本研究对递增负荷运动过程中及4个恢复期后，大鼠子宫和卵巢ER、PR及血清E2、P水平的变化进行了连续监测.结果显示，血清E2、P随运动负荷量的加大而逐渐降低，组织ER、PR水平随运动负荷量的加大呈渐进性升高.受体水平在停训后的恢复期内随着E2、P水平的回升，逐渐回落.结果表明，运动中受体水平的变化可能为非激素依赖性升高，这种升高或许是机体对长期运动训练造成的低性激素环境的一种适应性反应，可能是AMI病理机制过程的重要一环.恢复期受体水平的恢复与E2水平的升高具有直接关系。  相似文献   

补充三宝胶囊对大运动量训练大鼠血清性激素水平与运动能力的影响     

卢向阳  乔玉成  张红娟 《北京体育大学学报》2006,29(4):497-499

为了探讨三宝胶囊对大运动量训练大鼠血清睾酮(T)、皮质酮(Cort)、黄体生成素(LH)含量及运动能力的影响.将雄性SD大鼠37只,随机分为:安静对照组(C);中药对照组(M);运动组(T);中药运动组(M T).中药组和中药运动组分别灌服三宝胶囊,运动组与中药运动组进行8周大运动量训练.于第7周末进行力竭性运动实验,第8周末次训练后18 h取样测定血清睾酮、皮质酮、黄体生成素含量.结果发现:1)服用三宝胶囊的中药运动组大鼠游泳至力竭的时间比单纯运动组延长了38.12%(P＜0.01).2)大运动量训练后18 h,T组大鼠血清睾酮仍处于较低水平(P＜0.01);M T组血清睾酮水平显著上升(P＜0.05).3)T组血清Cort水平显著增高(P＜0.05),M T组有降低趋势,但无统计学意义.4)T组T/Cort比值明显下降(P＜0.01),M T组T/Cort比值明显增高(P＜0.01).5)T组血清LH明显升高(P＜0.05),M T组LH基本维持在正常水平.表明:大运动量训练机体长时期服用三宝胶囊能促使血睾酮水平的提高,防止因大运动量训练导致的睾酮/皮质酮比值下降,有助于延缓大运动量训练疲劳的产生,促进恢复,提高运动能力.  相似文献   

Cultural determinants of economic growth: Theory and evidence     

Oliver Dieckmann 《Journal of Cultural Economics》1996,20(4):297-320

Shortcomings of neoclassical growth theory and growth accounting are viewed as a challenge for cultural economics. Recently, new growth theory has introduced several growth determinants and has closed the gap between theoretical and empirical research. Whether this development leaves space for cultural determinants in explaining economic growth is in the center of this paper. The theoretical analysis shows how an endogenous growth model can be used to explain the impact on economic growth of cultural determinants. The empirical part uses indices from cross-cultural studies to extend recent cross-country growth regressions. Among other Hofstedes uncertainty avoidance index is shown to be significantly correlated with economic growth.Discussion paper presented at the 9th international conference of the Association for Cultural Economics, Boston, May 8–11, 1996.  相似文献   

质点组内力的功改变质心动能的条件     

田志川 《通化师范学院学报》2003,24(6):25-26

讨论了质点组内力的功是可以改变质心动能的，以及所满足的条件．  相似文献   

Study on pig growth hormone gene polymorphisms in western meat-type breeds and Chinese local breeds     

宋成义  高波  经荣斌  陶勇  毛九德 《浙江大学学报(A卷英文版)》2003,4(6):734-739

Chinese Meishan and Jiangquhai pigs are two of the most prolific pigs in the world, but their growth rate is lower than that of Duroc, Landrace and Pietrain pigs. It is suggested that growth rate is regulated by growth hormone. The objective of the current study was to analyze the porcine growth hormone (pGH) gene polymorphisms based on the polymerase chain reaction restriction fragment-length polymorphism method (PCR-RFLP) for three western meat-type breeds (Duroc, Landrace and Pietrain) and two local Chinese pigs (Meishan and Jiangquhai). Five polymorphic restriction sites were detected with the ApaI, MspI, BspI and HhaI restriction enzymes in two amplified fragments (605 bp, -119 to +486; 506 bp, +206 to +711). Breed difference was found only in the 506 bp fragment. There was no difference in allelic frequencies of BspI and HhaI restriction sites among the five breeds (P>0.05). Landrace and Meishan pigs lacked allele G3 of MspI site. The allele G3 frequency of restriction MspI site of the 506 bp fragment in Pietrain pigs was higher than that in Duroc and Jianquhai pigs (P<0.001). For ApaI site, the Meishan pigs lacked allele G1; no difference was found in allelic frequencies among Pietrain, Duroc, Landrace and Jiangquhai pigs (P>0.05). This new and rapid PCR-RFLP typing method is an attractive tool for analysis of porcine growth hormone gene restriction sites. The differences in MspI and ApaI restriction sites may explain the growth difference between the foreign meat-type breeds above mentioned and local Chinese pigs.  相似文献   

环境激素的种类与危害     

詹秀环  王子云 《周口师范学院学报》2003,20(2):56-59

20世纪后期，野生动物和人类的内分泌系统、免疫系统、神经系统出现了各种各样的奇异现象，重要的原因是环境激素污染．阐述了环境激素的概念、来源、种类、危害及自我保护对策．  相似文献   

豆瓣绿的水培繁殖试验研究   总被引：4，自引：0，他引：4  

赵兰枝  刘振威  陈进洁  张允伟 《河南科技学院学报》2006,34(3):35-37

采用不同浓度的激素和不同浓度的营养液对豆瓣绿进行水培生根研究。结果表明：用不同浓度的营养液处理豆瓣绿，以1／2营养液生根效果最好，达13．3条，根鲜重达0．093g／棵，清水次之；用不同浓度的生长激素处理豆瓣绿，以30mg／L浓度的3-IBA生根效果最好，生根数达16．5条，根鲜重达0．132g／棵，10mg／L次之；在营养液与激素的互作处理中，清水与30mg／L激素、全营养与10mg／L激素的互作处理分别对豆瓣绿的生根数与根鲜重表现较优。  相似文献   

论中职教师的专业性     

查吉德 《职业技术教育》2011,32(1)

教师职业活动的独特性决定了教师专业的内生性.中职教师与普通高中教师因职业活动的差异,决定了他们专业性的差异.根据中等职业教育的培养目标、教育对象与教师的职业活动,中职教师的专业性是实践型的,实践性是中职教师的专业特质.  相似文献   

Cultivation of taste and bounded rationality: Some computer simulations   总被引：2，自引：2，他引：0  

Roger A. McCain 《Journal of Cultural Economics》1995,19(1):1-15

One can approach the economics of the arts, as any field of applied economics, in either of two ways. First, one can treat economic theory and econometric technique as subjects settled by specialists in those fields, to be used in the ec onomics of the arts as they are given, very much as if one were studying the demand for maize. Alternatively, one can treat the economics of the arts as a field which may need and suggest its own developments in theory and technique, suitable to its spec ial problems and processes, from which general economic theory and econometric theory might in principle learn something. Perhaps this latter view is implausible, given the high state of development of economic theory and econometrics in the modern liter ature. Yet many of the advances embodied in these fields have come from particular areas of application-and the economics of maize has been a particularly fertile field.I am indebted to participants in the Seventh International Conference on Cultural Economics, Fort Worth, Texas, October 1992; to p articipants in the Seminar on the Economics of the Arts, Venice, Italy, December 1992; to participants in the conference of the Pennsylvania Economists' Association, Wiles-Barre, PA, June, 1993; to participants in the second conference on Simulating Soci eties, Siena, Italy, July 1993; to participants in the conference of the Society for the Advancement of Behavioral Economics, Rensselaerville, NY, August 1993; and to participants in the Third Conference on Artificial Intelligence in Economics and Manage ment, Portland, OR, August 1993, for useful comments on topics related to the research reported in this paper. Errors and omissions are, of course, attributable to the author.  相似文献   

试论中老年人股骨颈骨折的防治与体育康复     

江孝珠 《体育科学研究》1998,2(4):47-50

中老年人应及早防治“骨质疏松症”。通过加强自我防治意识;及时补充微量元素和食用含钙量高的食物。坚持体育运动,提高钙的利用率以防患于未然。一旦发生股骨颈骨折,应采用中,西医结合,服用药物与体育医疗相结合,使其早日康复,达到“老能自养”,“老有所乐”。  相似文献