2004年宪法学研究综述

2004年我国宪法学研究成果丰硕，呈现出方向更明确，力度更强，讨论范围更广的趋势，关注热点，理论与实践结合紧密的文章多起来。归纳起来有5个方面的内容：2004年宪法修改问题，政治文明与宪政问题，宪法司法化问题，宪法监督问题，国外宪法制度研究问题。     

Physicochemical characterization of Baizhi particles by ultrafine pulverization

Baizhi, as a medicinal plant, has been demonstrated to be useful for the treatment of aches and pains in China. The physicochemical characterization of Baizhi particles is greatly influenced by ultrafine pulverization. To study the physicochemical characterization of Baizhi, the raw plant material of Baizhi was ground to 6 μm particles by a high speed centrifugal sheering (HSCS) pulverizer. The micron particles were characterized by optical microscopy and scanning electron microscopy (SEM). Imperatorin is one of the active ingredients of Baizhi, and its extraction yield is determined to evaluate the chemical characterization of Baizhi powder. Imperatorin was analyzed by high performance liquid chromatography (HPLC). The results show that after ultrafine pulverization, the plant cell walls are broken into pieces and the extraction yield of imperatorin is increased by 11.93% compared with the normal particles.     

Roles of flanking sequences in the binding between unimolecular parallel-stranded G-quadruplexes and ligands

G-quadruplexes attract more and more attention in recent years.Numerous small molecules which can induce or stabilize the formation of G-quadruplexes have been investigated on the purpose of anticancer drug development.As a motif existed in physiological condition,flanking sequences are an important part of G-quadruplexes but the study on the impact of flanking sequences on (G-quadruplex)-ligand binding is rarely reported.In this paper,the effects of flanking sequences on binding affinity between a series of unimolecular parallel-stranded G-quadruplex sequences derived from c-myc oncogene promoter (termed as c-myc G-quadruplexes) and their ligands are discussed in detail.The results showed that the flanking sequences on c-myc G-quadruplexes play key roles in (G-quadruplex)-ligand interaction.When a c-myc G-quadruplex is bound to its ligands,the flanking sequences might form a binding cavity above the terminal G-quartet,which could provide a suitable site for ligands to dock in.Moreover,the bases on flanking sequences could interact with ligand through π-π stacking,and finally form a sandwich-stacking mode (terminal G-quartet,ligand and bases on the flanking sequence).This mode could stabilize the (G-quadruplex)-ligand complex effectively and enhance the binding affinity dramatically.However,flanking sequences are also found to exhibit steric hindrance effect which could impede the (G-quadruplex)-ligand binding.     

关于cf-可膨胀空间和csf-可膨胀空间的注记

文章主要给出了关于cf-可膨胀空间类的映射性质,并证明了若X=Πσ∈ΣXσ是Σ-仿紧(遗传Σ-仿紧)的,则X是cf-可膨胀(遗传cf-可膨胀)的当且仅当对F∈[Σ]相似文献   

如何高效管理、利用个人数字图书馆

从实用的角度，阐述了个人数字图书馆的概念、构建目的、必备条件及其种类，就如何管理和应用数字文献信息进行了探讨，认为管理及应用好个人数字图书馆能为科研工作者从事科研工作提供有力的文献信息保障。     

一种提取和纯化肌钙蛋白C的新方法

肌钙蛋白Ⅰ是肌钙蛋白的一个亚基，它有３种异构体：快、慢骨骼肌肌钙蛋白Ⅰ和心肌肌钙蛋白Ⅰ。由于心肌肌钙蛋白Ⅰ具有极强的心脏特异性，因此引起众多学者的兴趣，研究检测患者血清内心肌肌钙蛋白Ⅰ的含量，来诊断急性心肌梗塞。利用肌钙蛋白Ｃ和肌钙蛋白Ⅰ的亲和层析来提取和纯化肌钙蛋白Ⅰ。建立了一种简单的肌钙蛋白Ｃ的提取和纯化方法，从兔肌１００ｇ中可提取肌钙蛋白Ｃ ７５ｍｇ，不仅高于以往研究结果（６０ｍｇ／１００ｇ兔肌），而且使实验周期缩短和实验操作大为简化。     

强力砂带平面磨削工件表面残余应力的研究

分析了强力砂带平面磨削时工件表面残余应力产生的原因，通过分析磨削热的影响，找出了一个由磨削用量组成的亲折磨削参数，建立表面残余应力数学模型。经过实验验证，此模型能恰当地描述强力砂带平面磨削时工件表面残余应力分布的规律，并分析了各因素对模型中参数的影响，得出一些重要结论。     

伯胺N1923萃取Re(Ⅶ)的研究

用平衡法研究了伯胺 N1923的正辛烷溶液从氯化物介质中苹取铼(Ⅶ),其反应方程式为RNH_3Cl_((0))+ReO_4~-RNH_3ReO_4_((0))+Cl~-求得 Kex=10~(1.08)。运用 ReO_4~-离子选择电极作检测手段,用恒界面搅拌法研究了该苹取体系的动力学。结果表明,苹取反应机理是两步界面反应RNH_3Cl_(i)+ReO_4~-RNH_3ReO_(4(i))+Cl~-RNH_3ReO_(4(i))+RNH_3Cl_((0))RNH_3ReO_(4(0))+RNH_3Cl_((i))用计算机模拟方法求出了各 k 值。     

褐马鸡主要传染病及寄生虫病研究

作者应用临床诊断、病理解剖、流行病学、细菌学检查及内外寄生虫检查等方法,检出庞泉沟自然保护区棚养褐马鸡不仅有传染病——鸡新城疫和雏鸡白痢病,而且有寄生虫——鸡异刺线虫和鸡剌皮螨。     

改性膨润土对水中敌百虫和敌敌畏的吸附性能研究

研究了用季铵盐阳离子表面活性剂四甲基氯化铵（TMAC）、四乙基氯化铵（TEAC）和十六烷基三甲基溴化铵（CTMAB）改性的膨润土对有机磷农药敌百虫和敌敌畏的吸附性能。结果表明，用阳离子表面活性剂改性的膨润土的层间距和有机碳含量与改性时所用表面活性剂种类有关；改性膨润土对水中敌百虫和敌敌畏的吸附能力优于原土，并且吸附量随阳离子表面活性剂碳链的增长而增大；同一长链阳离子表面活性剂改性的膨润土对敌敌畏的吸附能力大于敌百虫；温度升高不利于敌百虫和敌敌畏在改性膨润土上的吸附。