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家鸽循环系统的教学五峰县郑宏，唐德松（４３３４００）我在教家鸽循环系统时，利用医院已报废了的一次性输液管（这种输液管由透明塑料制成，如图１所示）为材料，制作成投影片进行教学，收到了十分明显的教学效果。一、制作步骤：１．画出家鸽循环系统图解（如图２所示... 相似文献
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唐德松 《中小学实验与装备》1997,(3)
强化实验教学提高教学质量湖北省五峰县电教仪器站（４４３４００）唐德松九年制义务教育初中物理、化学、生物和小学自然教学大纲与教材，把实验教学提高到一个新的水准，要求教与学必须在实验基础上进行。因此，我们在教学活动中务必把强化实验教学、提高教学质量的工作... 相似文献
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唐德松 《中小学图书情报世界》1998,(4)
1995年8月4日,全国政协委员、原国家教委副主任邹时炎同志不顾年岁已高和路程遥远,带领国家教委体育卫生艺术教育司、图工委、世界书苑等部门的领导和省市教委的同志一行13人,风尘仆仆来到五峰山寨,向五峰县中小 相似文献
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Interaction of catechins with aluminum in vitro 总被引：1，自引：0，他引：1
INTRODUCTION nd that catechin-metal complexes had strong bio- activities (Midori et al., 2001). But, it is not clear Because of the aluminum accumulation in tea what the mechanism of combination of catechinsplant, the safety hazard of aluminum absorption with aluminum ion is (Inoue et al., 2002), and alsowhile drin… 相似文献
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浅谈实验室工作和操作考核的辩证关系五峰县仪器站唐德松唐文涛（４４３０００）应届初中毕业生的实验操作考核已普遍展开，这项工作已在各校引起相当的重视，它对促进实验室的建设、教育技术的全面装备；实现实验室科学化、规范化的管理；促进实验教学及其研究，由单纯的... 相似文献
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Tea is one of the most popular beverages, consumed by over two thirds of the world's population; but the aluminum accumulation property of tea plant is becoming the focus of many researches because of aluminum's known adverse effect on human health. Investigation of the interactions of catechins with Al3 showed that during the interaction of catechins with Al3 , the UV-vis spectrum of catechins was changed. Absorption of EGCG at 274 nm decreased and increased at 322 nm; EC and C's at 278 nm changed little. The ratio of Al3 to EGCG was 1:1 in pH 5.0 buffer solution; in pH 6.2 buffer solution, the ratio in the Al-EGCG complex was 1:1. Interestingly, while the ratio reached to over 2, after the complex of Al-EGCG started polymerization, the ratio in the polymer was 2:1. In pH 6.2 buffer solution, the complex behavior of C with Al3 was the same as that of EGCG, with a little difference for EC. When the ratio of Al3 to EC was <1, the complex in ratio was 1:2, but, the complex polymerized when the ratio of Al3 to EC was >1. It was found that the ratio of Al3 to EC in the polymer was 1:1. Polymerization of Al-catechin complexes might reduce aluminum absorption in the intestine. Kow value was also employed to study the properties of aluminum species in tea infusion (at gastric and intestine pH condition) and the effect of catechins and tea polyphenols on Kow in buffer solution. Results showed that Kow value rose much higher at the intestine pH than at the gastric pH. Tea polyphenols and catechins could greatly reduce aluminum Kow value in acetic buffer, indicating that these compounds may reduce aluminum absorption during tea intake. 相似文献
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