介绍一种共价化合物电子式的简易写法

介绍了一种书写共价化合物电子式的简易方法。     

高密量互贯磺酸树脂的合成及应用于含锌废水处理

本文着重研究具有高容量的互贯磺酸树脂的合成及应用.调节适当的两网交联度和互贯度并在磺化反应的后阶段补加少量发烟硫酸,可获得交换容量大、强度好且兼有较好动力学可透过性的互贯树脂.用这种树脂处理化纤厂的含锌废水,选择适当的操作条件时可得到理想的效果.     

PMMA-based Gel Polymer Electrolytes with Crosslinking Network

The lithium-ion battery has a good rate capability and low-temperature performance, but its safety is relatively low due to the possibility of leakage of liquid electrolyte. The use of a solid or gel type electrolyte can lower the probability of leakage liquid electrolyte, and the electrochemical performance of gel electrolyte doesn＇t decrease so markedly as the solid electrolyte. Now, new types of advanced lithium-ion battery with gel polymer electrolytes are under developing which can be used in the future.     

Cu0.5Zr2(PO4)3:Cu2+中心g因子研究

由于Cu0．5Zr2(PO4)3晶体具有良好的离子传导能力、催化特性、较低的热膨胀性，对它的研究引起了广泛的关注．本文引入平均共价因子N，并结合晶体结构数据给出了3d^9离子在晶场D4h下的g因子公式，利用该公式并结合Cu0．5Zr2(PO4)3晶体的具体结构数据对Cu0．5Zr2(PO4)3晶体中CU^2 中心的EPRg因子进行了理论分析计算，所得到的结果与实验值基本吻合．     

Carcinogenesis switched on by DNA cross-link between complementary bases aroused by aflatoxin and N-nitroso compounds

The di-region theory put forward by Dai Qianhuan, a molecular mechanism of chemical carcinogenesis, concluded that the carcinogenesis induced by most of the environmental carcinogens is switched on by the cross-linking between DNA complementary bases aroused by the bifunctional alkylation of their metabolic intermediates. It was evidenced in this paper with DNA filter elution method that one carcinogenic mycotoxin, aflatoxin G1, four carcinogenic N-nitroso compounds, N-nitrosodiethyl-amine, N-nitrosodibutyl-amine, N-nitrosomorpholine and N-nitrosopyrrolidine, one carcinogenic diazo color, 4-dimethylaminodiazobenzene and one carcinogenic nitrogen-containing heterocyclic compound, quinoline, all induced DNA interstrands cross-linking with dosage correlation after metabolic activation. However, the non-carcinogens in corresponding series for control, aflatoxin B2, N-nitroso-diphenylamine, 4′-bromo-4-dimethylaminodiazobenzene and isoquinoline, cannot induce DNA interstrands cross-linking at all in the same condition. A method for the determination of cross-linking ratio between DNA complementary bases in total DNA interstrands cross-linking, which has no monitoring measure as yet, has been established for the first time based upon a 24 hour repairing experiment. The DNA complementary pair cross-linking ratio induced by a metabolized carcinogen is correlated with its carcinogenic potential. It may be concluded that the mutations including point and frameshift mutagenesis induced by aflatoxin and other carcinogens are switched on by their corresponding cross-linking base pair between complementary bases. Therefore, the di-region theory is a reasonable molecular mechanism for chemical, endogenous and physical carcinogenesis.     

鸡溶菌酶和重组大肠杆菌融合蛋白(NADP-GDH)体外分子交联的初步研究

用PCR方法克隆的大肠杆菌NADP特异性谷氨酸脱氢酶 (NADP specificglutamatedehydrogenase ,NADP GDH)基因和其突变基因 ,插入表达载体pTrcHisC构建重组蛋白质表达体系 .经过IPTG诱导表达 ,用Talon固定化金属亲和层析树脂纯化出重组的天然和突变NADP GDH ,将它们和溶菌酶 (Lysozyme)通过热诱导去折叠方法进行体外蛋白质分子交联实验 ,在去折叠反应液中加入还原剂二硫苏糖醇 (DTT)后 ,不但没有分子间二硫键交联形成 ,同时也没有其他分子间共价键 (异肽键 )交联的形成 .另外 ,半胱氨酸残基定点突变后的NADP GDH重组蛋白质 ,无法参与形成分子间二硫键 ,实验证实经过热诱导去折叠后也没有分子间共价键 (异肽键 )交联 .这些结果进一步证明蛋白质分子间二硫键的形成能够促进蛋白质其他分子间共价键 (异肽键 )的形成 .     

聚丙烯酸酯/环氧树脂AB交联聚合物的研究

通过红外光谱、扫描电镜及动态力学谱对聚丙烯酸酯／环氧树脂（PA／EP）双组分AB交联聚合物进行表征．聚丙烯酸酯／环氧树脂组分之间以甲基丙烯酸二甲胺酯（DM）为固化剂,通过环氧基团的开环聚合形成了AB交联聚合物,结果表明,不同组分间的配比影响组分间的交联密度,进而影响体系的结构和性能．     

在硫代或连多硫酸根等中硫原子氧化数的确定方法

本文讨论了硫代、连多硫酸根等中所带电荷在不同位置时对氧化数所产生的影响,提出了确定硫代、连多硫酸根等中每个硫原子氧化数的方法.对有些硫代、连多硫酸根等所得的结果与某些教材和论著是不相同的.     

pDNA-巯基壳聚糖纳米粒的制备及Box-Behnken效应面法工艺优化

以巯基壳聚糖(TCS)为基因载体,采用离子交联法制备能用于基因口服研究的质粒DNA-巯基壳聚糖纳米粒(pDNA-TCS-NPs).分别以TCS质量浓度、三聚磷酸钠(TPP)质量浓度、pH值和转速为考察对象,以pDNA-TCS-NPs粒径和Zeta电位为评价指标,采用4因素3水平Box-Behnken 效应面法筛选最佳制备工艺,并对其外观形态,包封率等体外性质进行考察.结果表明:TCS质量浓度为0.80 mg·mL^-1,TPP质量浓度为0.65 mg·mL^-1,pH=5.3,转速为2 000 r·min^-1是最优制备工艺,可制得粒径为(134.21±1.34)nm,Zeta电位为(24.36±0.29)mV,包封率在(80.26±0.56)%,形状规则且分散良好的pDNA-巯基壳聚糖纳米粒;Box-Behnken 实验设计可用于预测和优化pDNA-TCS-NP制备工艺优化筛选.     

在绿柱石晶体中掺入Fe^3＋的吸收光谱研究

绿柱石是一种结构较复杂的硅酸盐矿物,其晶体结构中Al^3＋可以被Fe^2＋,Fe^3＋等取代,对这种晶体的吸收光谱的研究有助于认识绿柱石晶体的结构,从而更好的使这种晶体得到应用．本文引入平均共价因子Ⅳ,在立方晶场下考虑电子静电相互作用,通过完全对角化的方法对掺入Fe^3＋的绿柱石晶体的吸收光谱进行理论计算,并对实验结果中吸收峰进行了识别．结果表明,实验与理论符合的比较好．