TCCA(Tutor of“Channels,Collaterals and Acupuncture)是一个基于微型机的中医“经络腧穴学”智能教学系统。它面向高级、中级和普及型三类学生及教学专家,采用统一的泛概念网知识描述结构以及灵活的教学策略,利用个别辅导、会话和模...TCCA(Tutor of“Channels,Collaterals and Acupuncture)是一个基于微型机的中医“经络腧穴学”智能教学系统。它面向高级、中级和普及型三类学生及教学专家,采用统一的泛概念网知识描述结构以及灵活的教学策略,利用个别辅导、会话和模拟相结合的教学模式进行教授。本文介绍系统功能、设计思想和实现结构。展开更多
2-Isoxazolines and 2-pyrazolines have been derived from oxime and hydrazone derivatives reacted with <i><i><span style="font-family:Verdana;">N</span></i></i><span styl...2-Isoxazolines and 2-pyrazolines have been derived from oxime and hydrazone derivatives reacted with <i><i><span style="font-family:Verdana;">N</span></i></i><span style="font-family:Verdana;">-chlorosuccinimide (NCS) and trichloroisocyanuric acid (TCCA). Cyclization strategy is developed for the reaction of <i></i></span><i><i><span style="font-family:Verdana;">β</span></i></i><span><span style="font-family:Verdana;">, <i></i></span><i><i><span style="font-family:Verdana;">γ</span></i></i></span><span style="font-family:Verdana;">-unsaturated hydrazones with the TCCA to drive 2-pyrazolines and the reaction of <i></i></span><i><i><span style="font-family:Verdana;">β</span></i></i><span><span style="font-family:Verdana;">, <i></i></span><i><i><span style="font-family:Verdana;">γ</span></i></i></span><span style="font-family:Verdana;">-unsaturated oximes with NCS to derive 2-isoxalzolines. Structures of all new 2-isoxazolines and 2-pyrazolines have been elucidated by microanalyses, <sup></sup></span><sup><span style="font-family:Verdana;">1</span></sup><span style="font-family:Verdana;">H, <sup></sup></span><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C NMR and Mass spectroscopies.</span>展开更多
采用静态及半静态方法,研究了强氯精、高锰酸钾、甲醛对中华倒刺鲃幼鱼的急性毒性。实验结果(静态和半静态96 h LC_(50))显示,这3种刺激性渔药中强氯精对中华倒刺鲃幼鱼的毒性最强(1.50、1.13 mg·L^(-1)),其次是高锰酸钾(1.76、...采用静态及半静态方法,研究了强氯精、高锰酸钾、甲醛对中华倒刺鲃幼鱼的急性毒性。实验结果(静态和半静态96 h LC_(50))显示,这3种刺激性渔药中强氯精对中华倒刺鲃幼鱼的毒性最强(1.50、1.13 mg·L^(-1)),其次是高锰酸钾(1.76、1.24 mg·L^(-1)),最小的是甲醛(39.91、36.72 mg·L^(-1));它们在静态和半静态条件下的安全浓度分别为0.53、0.34,0.55、0.39,7.13、6.77 mg·L^(-1)。结果表明:含氯类(强氯精)、氧化剂类(高锰酸钾)、醛类(甲醛)对中华倒刺鲃幼鱼均具有一定的毒性,但是毒性较小,依然可以作为渔药使用。展开更多
文摘TCCA(Tutor of“Channels,Collaterals and Acupuncture)是一个基于微型机的中医“经络腧穴学”智能教学系统。它面向高级、中级和普及型三类学生及教学专家,采用统一的泛概念网知识描述结构以及灵活的教学策略,利用个别辅导、会话和模拟相结合的教学模式进行教授。本文介绍系统功能、设计思想和实现结构。
文摘2-Isoxazolines and 2-pyrazolines have been derived from oxime and hydrazone derivatives reacted with <i><i><span style="font-family:Verdana;">N</span></i></i><span style="font-family:Verdana;">-chlorosuccinimide (NCS) and trichloroisocyanuric acid (TCCA). Cyclization strategy is developed for the reaction of <i></i></span><i><i><span style="font-family:Verdana;">β</span></i></i><span><span style="font-family:Verdana;">, <i></i></span><i><i><span style="font-family:Verdana;">γ</span></i></i></span><span style="font-family:Verdana;">-unsaturated hydrazones with the TCCA to drive 2-pyrazolines and the reaction of <i></i></span><i><i><span style="font-family:Verdana;">β</span></i></i><span><span style="font-family:Verdana;">, <i></i></span><i><i><span style="font-family:Verdana;">γ</span></i></i></span><span style="font-family:Verdana;">-unsaturated oximes with NCS to derive 2-isoxalzolines. Structures of all new 2-isoxazolines and 2-pyrazolines have been elucidated by microanalyses, <sup></sup></span><sup><span style="font-family:Verdana;">1</span></sup><span style="font-family:Verdana;">H, <sup></sup></span><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C NMR and Mass spectroscopies.</span>