Studies on the Voltammetric Behavior of Nicardipine Hydrochloride and its Voltammetric Determination at the Co/GC Modified Electrode

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Preface

Organic solids are organic and polymeric materials with special functionalities that stem from our increasing ability to manipulate and tune the properties of organic and polymeric materials (e.g. optoelectronic properties). We achieve this through the systematic variation of their molecular components, to allow for molecular-level control of the solid-state structure via arrangement of the functional molecular components into a defined solid architecture.     

Structure Characteristic and Catalase Activity of Vitreoscilla Hemoglobin Bound with Membrane

Lipid-bound [VHb(406)] and lipid-free [VHb(402)] wide type Vitreoscilla hemoglobin were separated from E. coli BL21(DE3). The RZ is 3.30 for [VHb(406)] and 3.15 for [VHb(402)], respectively. VHb(406) shows a characteristic absorption band at 626 nm, while VHb(402) shows one at 644 nm, and it has more α-helix than VHb(402). Data of Raman spectra experiment shows under the excitation wavelength 488 nm, υ4 vibration of both VHb(402) and VHb(406) had a pure and strong signal at 1375 cm-1, which proves that iron...     

微观结构对膜换湿能力影响研究

对多孔膜换湿过程进行了理论分析,得到了透湿量和湿阻的计算式.同时对三种膜包括PVDF,PES和纤维素膜进行了湿阻的测量实验,通过对实验数据的回归处理,得到了多孔膜的结构参数.结果表明,膜厚、孔径分布、孔隙率及曲折因子对膜的换湿特性都有较大影响,在平均孔径相同的情况下,其它因素仍然导致了不同膜换湿能力的较大差距。在所获得的结构参数基础上,通过数值模拟的方法研究了平均孔径对膜换湿能力的影响。结果表明湿阻随平均孔径的增大而减小,减小趋势逐渐平缓最后趋向一定值。     

α-Oxo Ketene Dithioacetals Chemistry-A Facile Route to the Synthesis of Fused Heterocyclic Compounds

Q-Oxo ketene dithioacetals and related compounds are versatile synthons in organicsynthesis'-'. The substitution reaction of or-oxo ketene dimethylthio acetals with diamineis one of the impel'tant applications for the synthesis of corresponding a-oxo ketenecyclic N, N-acetals. Junjappa and co-workers described this reaction ill a review'.However, since some kinds of ketene dimethylthio acetals are not easy to prepare, themethod melltioned above is limited. Zhu and co-workers had successfully…     

A Novel Synthesis of Methyl 4, 6-O-Benzylidene-α-D-Glucopyranoside 2, 3-Cyclic Phosphite Ethyl Ester

Itiswellknownthatnearlyallthebiochemicalmetabolicprocessesofcarbohydratesinlivingorganismsinvolvetheparticipationofphosphorus.Forexample.glycosylphosphatesareofgreatsignificanceforthebiologicalactivityofglycoconjugatesandcanserveasintermediatesinbiologicalglycosyltransfer.Theyarealsoofgreatimportanceasglycosyldonorsinpreparationofoligosaccharides,whichareconstituentsofbiologicallyimportantcompoundssuchasantibiotics,glycolipids,glycoproteins.andimmunodeterminants'.Hencetheinvestigationofphospho…     

关于分布函数极大值位置的讨论

将关于某个变量的连续分布函数进行变数变换，除非新老变数为线性关系，否则变换前后的分布函数的极大值之间的关系一般会不同于新老变数之间的关系。     

杯芳烃衍生物的合成和性质的研究(Ⅴ)

通过对特丁基杯[4]芳烃的酚羟基的选择性醚化制备了一系列一烃基,1,3-二烃基和四烃基醚,烃基分别含有缩醛、酰胺、氰基等活泼官能团.醚化反应的区域选择性主要取决于使用的碱的种类和反应时间的长短.     

利用回归分析对正交试验结果进行修正

本文以纱线上浆率工艺参数正交试验为实例 ,利用回归分析的方法加以验证和修正 ,使工艺参数更符合实际情况 ,说明两种方法有较好的互补性 .     

α，α‘—二氧代烯酮环二硫代缩酮类化合物的特征红外光谱（Ⅲ）

研究了5种α，α‘-二氧代烯酮环二硫代缩酮类化合物的碳基、碳碳双键、碳硫等一些特征红外光谱，尤其着重研究了共轭体系下的各种特征谱带随化学结构而变化的规律。