La—苯酚甲叉替乙二胺配合物的合成及表征

本文以水杨醛和乙二胺合成的水杨甲叉替乙二胺为配体,与La(NO_3)_3·6H_2O合成了La—苯酚甲叉替乙二胺配合物。经元素分析、红外光谱、热重分析、紫外光谱、核磁共振和摩尔电导等一系列测试,为确定配合物的组成提供了依据。     

应用fermion－spin理论研究t－J模型的基态性质

应用ｆｅｒｍｉｏｎ－ｓｐｉｎ理论，研究了氧化物超导材料的基态性质。平均场结果说明在没有掺杂的半满情况下，系统处于磁性的π－ｆｌｕｘ状态。在掺杂情况下，讨论了系统的动能、相分离、与掺杂有关的反铁磁长程序等问题，结果与实验及数值模拟结果符合较好。     

N-Monomethyl-arginine and nicotinamide prevent streptozotocin-induced double strand DNA break formation in pancreatic rat islets

The impact of short term in vitro exposure to the diabetogenic drug streptozotocin on pancreatic islet glucose metabolism, insulin secretion, DNA fragmentation and cell viability, was studied. Streptozotocin impaired cell viability as well as insulin secretion and the oxidation of glucose. These effects were partially counteracted by inhibition of the inducible form of nitric oxide synthase with N-monomethyl-arginine and by scavenging oxygen free radicals with nicotinamide. Isolated islets underwent double strand DNA fragmentation after 24 h in culture. The degree of DNA breakdown was strongly enhanced by exposure of the islet DNA was obtained with N-monomethyl-arginine and nicotinamide. These data suggest that the generation of reactive oxygen and nitrogen species is involved in the deleterious action of streptozotocin on pancreatic islet tissue. A role for oxygen radicals generated during streptozotocin-induced islet cell damage as possible mediators of the expression of the inducible form of nitric oxide synthase and the scavenging action of nicotinamide on these radicals, is then proposed.     

一氧化氮诱导棘阿米巴凋亡的初探

本实验旨在通过形态学和生物化学方法探讨NO对棘阿米巴凋亡的影响。将棘阿米巴在不同浓度的SNP（NO供体）处理条件下孵育一定时间，选用末端脱氧核苷酸转移酶（TdT）介导的d-UTP缺口末端标记法（TUNEL)、透射电镜观察可发现SNP（外源性NO供体）可诱导棘阿米巴滋养体随SNP剂量和时间的增长，逐渐产生凋亡的趋势；透射电镜下可见实验组（终浓度3mmol/L的SNP与棘阿米巴孵育9h和12h）棘阿米巴滋养体有凋亡的超微结构特征。结果表明NO可对棘阿米巴凋亡产生影响并发挥其抗棘阿米巴感染的作用。     

Progress in study on metalloporphyrin mimicking metalloenzymes

The development of research on metalloporphyrins, which are used as model compounds for some metalloenzymes, is reviewed, including the survey of oxygen binding of heme, the catalytic oxidation of cytochrome P450, the molecular recognition to amino acid esters, the self-assembly and self-aggregation of metalloporphyrins.     

综合利用煤矸石资源

煤矸石是煤炭工业的固体废弃物，一般含Ａｌ２Ｏ３在２０～３０％，又是宝贵的铝资源。煤矸石可用酸浸取以制备铝盐，浸取渣经适当处理，可制得廉价的吸附剂。实验结果表明，煤矸石中Ａｌ２Ｏ３的溶出率可达９５％以上，制得的吸附剂具有良好的吸附性能。煤矸石的酸浸取液可直接作为废水处理的絮凝剂使用，制得的吸附剂也可直接用于工业废水处理，达到以废治废的目的。通过煤矸石的综合利用，还能产生一定的经济效益，实现环境效益和经济效益的统一。     

射线立体检测中拍片评片位置关系的数学模型

探讨胶片处于复斜位置拍片及其在三维评片仪上测片时建立数学模型的方法．测试结果表明，该方法可以满足工业探伤“三定”分析的要求     

微钙高硬高韧结构钢的研究

本文研究了一种新型的高硬度（HRC＞58），高韧性（αk≥40J/cm2)的结构钢的化学成分及热处理对冲击韧性的影响，实验结果表明，微量钙对改善钢在淬火－低温回火态的冲击韧性有重要作用，铬含量及铜／硅比对冲击韧性也有一定的影响。