薄层色谱溶剂系统的最优化方法

本文以模糊聚类分析法对81种常用溶剂进行分类,并根据最相邻原理从中优选出二十种色谱分析常用溶剂。再据此结果,以均匀设计试验法和最优化方法——单纯形法为手段,进行溶剂系统的最优化设计。并提出一个改良的色谱优化函数。经初步验证,这是一种比较有效与实用的系统化方法,尚未见国内外报道。本法不仅适用于薄层色谱,也适用于纸色谱及柱型液相色谱。     

Spontaneous bacterial peritonitis in fulminant hepatic failure

Ascites may be associated with fulminant hepatic failure (FHF), but spontaneous bacterial peritonitis (SBP) is an extremely rare complication. We report on two patients with FHF who developed SBP. One patient died and the other recovered.     

In vitro and in vivo selectin-blocking activities of sulfated lipids and sulfated sialyl compounds

There is accumulating evidence that sulfated lipids, sulfated oligosaccharides and other sulfated compounds are reactive with selectins in a manner that interferes with selectin interactions with their natural ligands. In the report we describe the ability of sulfated lipids (sulfatides and gangliosides) and multimeric forms of sulfated sialic acid to block binding of P- and E-selectin-Ig to neutrophils. The in vivo ability of these compounds to block lung injury in rats following i.v. infusion of purified cobra venom factor (CVF), which induces injury that is L- and P-selectin dependent, was also determined as well as effects on recruitment of neutrophils, as measured by lung myeloperoxidase. There was a significant correlation between the ability of sulfated lipids and sialyl compounds to interfere in vitro with P-selectin-Ig binding to neutrophils and to protect against P-selectin-dependent acute lung injury induced by CVF. The biological effects of these sulfated compounds were also associated with diminished accumulation of neutrophils. The protective effects of these compounds may be linked to their ability to interfere with P- selectin binding to counter-receptors on neutrophils.      

诺氟沙星的吸附行为及其测定

诺氟沙星在0.05mol·L^-1NH₄Cl (pH 5.8)溶液中,出现一灵敏的示波极谱还原峰。峰电位为-1.44 V (vs SCE)。峰高与诺氟沙星的浓度在1.0×10^-7～4.0×10^-6mol·L^-1范围内成正比,检出限为5.0×10^-8mol·L^-1,并用于样品的测定。用线性扫描与循环伏安法等手段研究体系的吸附性质。实验表明,该电极过程为具有吸附性的不可逆过程。