早期行为抑制性对儿童社会行为发展的预测研究

行为抑制性和非抑制性是气质的一个重要维度,对儿童的社会性发展具有重要意义。根据儿童早期的行为抑制性表现,可以预测其社会行为,如同伴交往、利他行为、问题行为等的发展。     

商业秘密保护与竞业禁止协议

雇员与雇主之间签订的竞业禁止协议是保护雇主商业秘密的一种比较有效的手段，但它同时会带来多方面的权利冲突，因此公权力的介入势所难免。公权力何时、何情况介入，必须有充足的理由。因此，协议的效力判断应以公平原则为指导并从协议的限制目的、对象、范围、期限、地域、领域和补偿等方面综合考虑。     

马铃薯多酚氧化酶反应动力学及抑制机理的研究

用丙酮从马铃薯中提取多酚氧化酶,用分光光度法测出酶催化反应的最佳条件是pH值为6.0,温度为23℃,反应活化能等于19.62 KJ/mol,米氏常数KM=4.46×10-3 mol/dm3,研究了6种抑制剂对酶活性的抑制作用,其中抗坏血酸的抑制机理是属于可逆竞争性抑制,求得与抑制有关的常数KI=1.13×10-2mol/dm3,对果蔬的保鲜有重要的指导意义.     

结构主义对《荆棘鸟》生命意识的阐释

运用结构主义叙事分析方法，阐述《荆棘鸟》内容的存在形态，思想它的生命意识与哲理意蕴：人的历史在一定程度上就是他的压抑史，无拘无束的满足生命需求的原则不可避免地会与自然环境和人的环境发生冲突，因此，在人性发展的意识范围内和它所创造的世界范围内的任何自由，都是要以牺牲欲望的充分满足为代价的。     

IN VITRO STUDY ON RIBOZYME AGAINST HEPATITIS C VIRUS

ＩＮＴＲＯＤＵＣＴＩＯＮＲｉｂｏｚｙｍｅｗａｓｆｉｒｓｔｄｅｓｃｒｉｂｅｄｂｙＣｅｃｈａｎｄＡｌｔｍａｎｉｎ 1 981 .ＴｈｉｓｆｏｒｍｏｆＲＮＡｈａｄｈｉｇｈｌｙｓｐｅｃｉｆｉｃｅｎｄｏｎｕｃｌｅａｓｅａｃｔｉｖｉｔｉｅｓｔｏＲＮＡ (Ｋｒｕｇｅｒｅｔａｌ.,1 982 ) .Ｒｉｂｏｚｙｍｅｓｈａｖｅｔｈｒｅｅｓｔｒｕｃｔｕｒｅｓ:ｈａｍｍｅｒｈｅａｄ ,ｈａｉｒｐｉｎａｎｄａｘｅｒｉｂｏｚｙｍｅｓ.Ａｍｏｎｇｔｈｅｍ ,ｔｈｅｈａｍｍｅｒｈｅａｄｒｉｂｏｚｙｍｅｈａｓａｓｉｍｐｌｅｒｓｅｃｏｎｄａｒｙｓｔｒｕｃ…     

声信号传导中的前掩蔽效应及其机理

在声学中,前掩蔽是指前一个声音作用时对后一个声音的辨别和感受造成的妨碍.它对人类和动物的声音感知和定位具有重要意义.前掩蔽效应受多种刺激参数的影响和调节.目前人们认为前掩蔽是外周的非线性和中枢水平线性整合的结果,其中神经抑制在前掩蔽的产生中起着重要作用,这种作用主要是γ-氨基丁酸能介导的.此外,非神经性原因等也起着一定的作用.     

侧链聚醚阻垢剂阻垢分散性能及机理的研究

研究了共聚物P（MPEGMA／AA）中单体聚乙二醇单甲醚甲基丙烯酸酯（MPEGMA,分子量550）、丙烯酸（AA）摩尔配比对阻垢分散性能的影响,并用X衍射（XRD）和电子扫描电镜（SEM）观察了碳酸钙垢晶型变化．结果表明,当共聚物中MPEGMA摩尔含量为1％～5％,共聚物具有较好的阻垢分散性能;ρCa^2＋为625mg／L,ρhco3^-为600mg／L,阻垢剂用量20mg／L时,阻碳酸钙率达70％以上;阻垢剂用量为5mg／L,阻磷酸钙率达80％以上,分散氧化铁上层清液最小透光率为62％．阻垢剂的侧链聚醚对碳酸钙垢具有晶格扭曲和分散作用．     

会话含义的认知心理解读

抑制机制、理想认知模型和相邻/相似性作为语言理解中的重要加工机制,受到越来越多的重视。本文尝试揭示这三者在会话含义推导中的作用,并在此基础上提出会话含义推理的整合模式,以期能对会话含义的解读做出新的诠释。     

Determination of organophosphorus pesticide residues in vegetables by an enzyme inhibition method using α-naphthyl acetate esterase extracted from wheat flour

The widespread use of organophosphorus pesticides (OPs) poses a great threat to human health and has made the detection of OP residues in food an important task, especially in view of the fact that easy and rapid detection methods are needed. Because OPs have inhibitory effects on the activity of α-naphthyl acetate esterase (ANAE) in plants, in this work we evaluated the possibility of detecting OPs in vegetables with ANAE extracted from commercial flour. The limits of detection (LODs) obtained for methamidophos, dichlorvos, phoxim, dimethoate, and malathion in lettuce samples with crude ANAE were 0.17, 0.11, 0.11, 0.96, and 1.70 mg/kg, respectively. Based on the maximum residue limits (MRLs) for OPs in food stipulated by Chinese laws which are 0.05, 0.20, 0.05, 1.00, and 8.00 mg/kg for methamidophos, dichlorvos, phoxim, dimethoate, and malathion, respectively, the esterase inhibition method with crude ANAE had sufficient sensitivity to detect the residues of dichlorvos, dimethoate, and malathion in lettuce, but it could not be used to guarantee the safety of the same samples if methamidophos or phoxim residue was present. The sensitivity of the method was improved by the use of esterase purified by ammonium sulfate salting-out. The LODs obtained for methamidophos and phoxim with purified esterase were lower than the MRLs for these OPs in food. This is a very promising method for the detection of OP residues in vegetables using crude or purified esterase because of its cheapness, sensitivity, and convenience.     

Strength training

Introductory textbooks commonly state that Golgi tendon organs (GTOs) are responsible for a reflex response that inhibits a muscle producing dangerously high tension (autogenic inhibition). Review of the relevant data from animal studies demonstrates that there is wide variability in the magnitude of, and even the presence of, GTO autogenic effects among locomotor hindlimb muscles, and that data on GTO effects under conditions of voluntary maximal muscle activation are lacking. A single available study on GTO function in humans, during a moderate contraction, surprisingly shows a reduction in autogenic inhibition during muscle‐force production. Further, it is not possible to find experimental evidence supporting the idea that strength training may produce a decrease in GTO mediated autogenic inhibition, allowing greater muscle activation levels and hence greater force production.