针刺和静力牵张对大负荷运动后骨骼肌M线变化影响的免疫电镜研究

用胶体金标记技术定位运动后及运动后经针刺或静力牵张处理的人骨骼肌M蛋白,以探讨超过习惯负荷后骨骼肌收缩结构变化以及针刺和静力牵张对促进其恢复的机制。我们发现:大负荷斜蹲后未经针刺的对照腿股外肌M线的M蛋白标记密度低于针刺腿(P<0.05),而对照腿M线两侧及M线两侧以外的M蛋白标记密度高于针刺腿(P<0.05)。对照实验证明运动腿M线以外增加的标记物为物异性标记。静力牵张组在M线及M线两侧的标记结果与针刺组一致。仅在M线两侧以外区域牵张腿与运动对照腿之间标记密度的差异没有统计学意义。我们还观察到运动后对照腿变化M线体密度达42—48％,而针刺或牵张腿为6—9％。上述结果表明大负荷运动加强了负荷后骨骼肌M蛋白的解聚或降解,从而导致M线结构改变;针刺和静力牵张可显著促进M蛋白的合成或抑制其降解,而使M线结构恢复或稳定。本文还探讨了M线变化与肌粗丝结构变化的关系。     

Gender and textbooks: Women writers of elementary readers, 1880–1950

Between 1880 and 1950, the role of women as authors of elementary readers flowered and faded. From 1880 to 1915, female authorship dominated. Over the next fifteen years female authorship withstood the challenge of the scientific movement in education. Women’s role as solo authors declined, however, during the Depression, World War II and the postwar years. These changes are explained by the deteriorating environment for female professionalism, changes in the concept of reading expertise, the expanded role of publishers in textbook development, and the differences between men and women in opportunities for graduate study. E. Jennifer is Monaghan a professor in the Department of Educational Services, Brooklyn College of the City University of New York. She is the founder of the History of Reading Special Interest Group of the International Reading Association and author ofA Common Heritage: Noah Webster’s Blue-Back Speller.     

当前体育信息学科的发展与展望

采用文献资料、学科综述、分析预测等方法,对当前国内、外体育信息学科的发展趋势从因特网、数据库、光盘与多媒体等高新技术的开发利用,到学科理论研究与建设进行了论述,从理论和实践两方面探讨了体育信息学科的发展趋势,并指出了当前我国体育信息学科与世界水平的差距.根据未来体育事业发展需要和深化体育科技体制改革的要求,提出了近期我国体育信息学科的发展战略和服务重点,认为信息资源的合理布局和开发利用、建立体育信息网络和多种类型的支撑数据库、开展应用信息和基础理论研究等是当前的主要发展领域.特别是提出了我国体育信息网络建设的布局和方案.论述了体育信息社会化和信息市场的开拓是充分体现信息价值,实现自我支持和自我发展的必经之路.