Substituted plan analysis in the environmental impact assessment of Yongchuan wastewater treatment project     

FANG Jun-hua 《重庆大学学报(英文版)》2006,5(2):107-110

Substituted plan in EIA mainly means a the treatment technology and the substituted site of wastewater plant, and it also includes the many kinds of environment protection measures. In principal, the substituted plan should reach the same aim and achieve …  相似文献   

Microwave-assisted synthesis, anticonvulsant activity and quantum mechanical modelling of N-（4-bromo-3-methylphenyl） semicarbazones     

Shalini M  Yogeeswari P  Sriram D  Induja S 《Journal of Zhejiang University. Science. B》2007,8(1):45-55

Objective： To study the effect of halo substitution on disubstituted aryl semicarbazones on the anticonvulsant potential and model the activity based on quantum mechanics. Methods： A series of twenty-six compounds of N^4-（4-bromo-3-methylphenyl） semicarbazones were synthesized and evaluated for the anticonvulsant activity in the maximal electroshock seizure （MES） and subcutaneous pentylenetetrazole （scPTZ） seizure threshold tests. Some potential compounds were also tested in the subcutaneous strychnine （scSTY） and subcutaneous picrotoxin （scPIC） seizure threshold tests. The synthesized compounds were tested for behavioral impairment and CNS （central nervous system） depression in mice. Quantum mechanical modelling was carried out on these compounds to gain understanding on the structural features essential for activity. Results： Some compounds possessed broad spectrum anticonvulsant activity as indicated by their effect in pentylenetetrazole, strychnine, picrotoxin and maximal electroshock seizures models in resemblance to other aryl semicarbazone derivatives reported earlier. The higher the difference in HOMO （highest occupied molecular orbital） and LUMO （lowest unoccupied molecular orbital） energy levels was, the greater was the activity profile. Conclusion： The pharmacophoric requirements for compounds to exhibit anticonvulsant activity that includes one aryl unit in proximity to a hydrogen donor-acceptor domain and an electron donor have been justified with the molecular orbital surface analysis of the synthesized compounds.  相似文献   

苯与溴取代反应实验的改进     

蔡书平 《教学仪器与实验》1999,15(1):7-7

在现行教材中,苯与溴取代反应的演示实验是在圆底烧瓶中进行的。由于反应放出热量,使苯与溴都产生了气化现象,烧瓶内充满了苯和溴的蒸气。当把烧瓶里的液体倒入盛有冷水的烧杯里时,苯和溴的蒸气外逸,污染教室内的空气。为此,我对这一演示实验进行了如下改进：一、仪...  相似文献   

2009年第12期《错在哪里》答案     

《中学生数理化(高中版)》2010,(1)

1.y=1/3x+3,y=3,x=0提示:错解中只考虑直线的斜率存在的情况,而忽视直线的斜率不存在的情况以及直线l平行于抛物线对称轴的两种情况.  相似文献   

高考明星——芳香族化合物     

孙竹梅 《中学生数理化(高中版)》2010,(3)

芳香族化合物是每年高考试题的重点,以它为载体可重点考查命名、同分异构体的书写和判断、有机化合物的性质、合成的理解和迁移应用,还可考查考生对信息的加工处理能力等.  相似文献   

取代反应“三视点”     

滕耀升 《理科考试研究》2000,8(11):61-64

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高考有机化学推断题点睛     

戴慧萍 《中学生数理化(高中版)》2010,(3)

有机化学推断题是高考必考题型,涉及的知识点多、思维容量大、综合性强.解题时常以反应类型为突破口,从反应条件、官能团、反应物和生成物组成的差异等反面进行判断.  相似文献   

决心取代绝望     

林芝 《小学生》2008,(6):42-42

有一个人在航行的时候把一颗贵重的珍珠掉进了大海里,这人回到岸上,拿了一只桶去舀海水,泼到陆地上。他不知疲倦地干了三天。第四天,水怪从海里出来问他:"你干吗舀  相似文献   

善意取得制度能否代替物权行为     

匡澜 《时代教育》2007,(9)

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取代环己烷椅式构象的课堂教学心得     

高巍 《中国科教创新导刊》2011,(23):101-102

构象异构特别是环己烷的椅式构象,作为有机化学重要章节《立体化学》的一部分,是学习己碳糖构象的基础。但因C-Cσ键的自由旋转而产生的多变性又使得它成为了学生们学习的难点。鉴于此,本文对取代环己烷椅式构象的画法做了较详细的阐述。  相似文献