微量元素硒与胚胎发育,胎儿宫内发育关系的初探

１９９２年５月￣１９９４年１月采用原子荧光分析法检测了１９７例孕妇血清硒（Ｓｅ）含量。１７例有流产先兆、孕卵枯萎、无胎芽患者，１６例曾有１￣３次畸形史及１８例胎儿宫内发育迟缓（ＩＵＧＲ），其血清中Ｓｅ含量均明显低于对照组（ｎ＝１４６，Ｐ〈０．００１）。     

气相色谱法快速测定空气中低分子量醛

用填充气相色谱直接进样法测定了污染空气中甲醛、乙醛、丙醛的含量,并对方法的灵敏度、准确度及各种影响因素进行了探讨。方法用于样品测定取得了较为满意的结果。     

氧化物表面单层改性对SnO2超微粒子热稳定性的影响

研究了氧化物在气敏材料二氧化锡超细粉表面的分散行为及分散量的二氧化锡热稳定性的影响,结果表明,氧化铜,氧化镍,氧化铋和氧化锌在二氧化锡表面均能单层分散,分散阈值均与按密置单层模型计算的最大分散容量相符,负载二氧锡的表面覆盖度与其稳定性之间有很好的对应关系,单层覆盖率达到一定程度二氧化锡高温烧结便可基本得到抑制。     

微量元素与儿童健康

论述了常见微量元素与儿童健康的关系，并简要地介绍了部分常见微量元素对人体的作用。提出了一些微量元素缺少或过量的药物治疗方法。     

二丁基次膦酸锌高聚物溶液的平衡粘度

通过对二丁基次膦酸锌聚合物溶液平衡粘度与体系中水含量间关系的研究,证明:高分子溶液的相对粘度随体系中水含量的增加而减少。反之亦然。在室温下可很快地建立起平衡。高分子溶液的平衡粘度值取决于体系的水蒸汽分压。     

生物质快速热解制备液体燃料

本文回顾了生物质快速热解液化技术的国内外研究现状,重点叙述了初级生物油的化学组成和燃料性质,指出生物油是一种复杂的含氧有机混合物,具有水分含量高、氧含量高、热值低、酸含量高、安定性差和化石燃油不互溶等独特的性质;针对这些性质,介绍了几种常用的生物油精制提炼方法,包括催化裂解、催化加氢、高温热解气过滤、添加助剂、催化酯化、柴油乳化以及制备富氢合成气与费托合成,并分析了各种精制技术发展的关键问题。     

Influence of the addition of Pd and Cu to cobalt catalysts prepared by SMAI for F-T synthesis

The Co-Pd/SiO₂ and Co-Cu/SiO₂ catalysts were prepared via solvated metal atom impregnation (SMAI) method and investigated for the Fischer-Tropsch (F-T) synthesis. The catalysts contained 5wt.% Co and a weight ratio of Pd (or Cu) to Co of 1/30. XPS indicated that Co, Pd and Cu were in metallic state. The results of XPS and magnetic measurements showed that Co and Pd (Cu) were alloyed. The Co particles on the catalysts were very highly dispersed and they displayed superparamagnetic behavior. FT-IR indicated that the electrons shifted from Cu and Pd to Co. Catalytic tests showed that CO hydrogenation rates followed the order Pd-Co > Cu-Co > Co.      

Capillary electrophoresis as a tool for screening aptamer with high affinity and high specificity to ricin

Aptamers which specifically recognize targets are selected from random oligonucleotide library using systematic evolution of ligands by exponential enrichment (SELEX). In this paper, capillary electrophoresis (CE) as a separation approach has been introduced to SELEX procedure. The high efficiency of CE gives rise to greatly shorten the selection procedure. The results from enzyme-linked assay and dot blot experiment show that an enrichment pool has been obtained after four rounds selection, which can specifically recognize ricin. __________ Translated from Chemical Journal of Chinese Universities, 2006, 27(10): 1,840–1,843 [译自: 高等学校化学学报]     

A facile, microwave-assisted, palladium-catalyzed arylation of acetone

We report an expedient method for the heteroarylation of acetone under tin-free conditions. The coupling is performed using the commercially available enol silane of acetone (2-trimethylsilyloxypropene) and a corresponding aryl bromide, chloride or triflate under microwave-assisted conditions, with tris(dibenzylideneacetone)dipalladium (Pd₂(dba)₃) or palladium acetate (Pd(OAc)₂) and 2-(2′,6′-dimethoxybiphenyl)dicyclohexylphosphine (S-Phos) as the catalyst system.