百里香酚兰的液液界面离子转移过程

用循环伏安法研究了百里香酚兰在水 /硝基苯界面的离子转移行为。根据百里香酚兰在溶液中的离解平衡和电化学性质 ,讨论了界面离子转移机理 ,并计算了转移离子的标准转移电位 ΔWOφ0 和标准吉布斯转移能 ΔWOG0 。实验所测半波电位 ΔWOφ1 /2 - p H曲线与理论公式相符     

猪心肌乳酸脱氢酶的提纯工艺及酶反应最适条件

研究了适合于工业化生产的猪心肌乳酸脱氢酶的初步提取工艺，经硫酸铵分级沉淀得到酶的比活为86．5U／mg，再经DEAE离子交换层析比活可达525．0U／mg，酶活总收率为54．5％．并对酶促反应的最适条件进行了研究，其最适反应pH为7．6～7．8，最适反应底物浓度分别为NADH5mg／mL和丙酮酸钠25mmol／L。     

钢的离子渗铬层组织及表面应力研究

本文采用离子氮化炉对Ａ３、４５、Ｔ１０、Ｔ１２钢进行离子渗铬。研究了渗铬层的组织及结构，阐明了渗层组织的形成机理。对Ｔ１０钢渗层组织进行了有无辉光放电作用的对比。测定了离子渗铬及无辉光放电作用的低压气体渗铬后钢件表面应力状态。     

稀土离子对伴刀豆球蛋白A血凝活性的影响

本文研究了稀土金属离子占据伴刀豆球蛋白A中Ca~(+2)离子结合位置对其血凝活性的影响,结果表明稀土离子对伴刀豆球蛋白A血凝活性差别不大。     

A practicable variant of the ion exchange method for the radiometric estimation of ornithine decarboxylase activity

Summary A known ornithine decarboxylase assay working with ion exchang separation of [³H]ornithine and [³H]putrescine has been revised. The assay can be performed in disposable 1.5 ml vessels with a total of four pipetting steps. The separation of enzyme substrate and product, respectively, requires 3 h per 50 samples. The detection limit is about 50 pmoles [³H]putrescine formed.     

The plasma membrane calcium pump: Recent developments and future perspectives

The Ca²⁺ pump of the plasma membrane (PMCA) is regulated by a number of agents. The most important is calmodulin (CaM), which binds to a domain located in the C-terminal portion of the pump, removing it from an autoinhibitory site next to the active site. The CaM-binding domain is preceded by an acidic sequence which contains a hidden signal for endoplasmic reticulum (ER) retention. Chimeras of the PMCA and endoplasmic reticulum (SERCA) pumps have revealed the presence of a strong signal for ER retention in the first 45 residues of the SERCA pump. Four gene products of the PMCA pump are known: two of them (1 and 4) are ubiquitously expressed, two (2 and 3) are specific for nerve cells and may be induced by their activation. Mutagenesis work has identified four residues in three of the transmembrane domains of the pump which may be components of the trans-protein Ca²⁺ path. The mutation of two of these residues alters the membrane targeting of the pump.     

大束斑强流金属离子源

介绍了新研制成的 MEVVA-Ⅱ和 MEVVA-ⅡA 离子源的结构特点和某些实验结果.新源采用大面积引出,引出直径60mm.该源脉冲工作,最大束流占空比为6%,已引出 Mg,Al,Ti,V,Cr,Fe,Ni,Cu,Zn,Y,Zr,Mo,Nb,Sn,W 和 Pb 等金属元素的离子,平均束流强度在10mA 以上,最大平均束流强度已超过20mA.MEVVA-ⅡA 源还采用了可推进的阴极结构,使阴极寿命大大提高,在引出平均束流10mA(Ti)条件下,已连续稳定运行16h.     

离子注入植物引起生物效应的机理

以３０￣２００ｋｅＶ的氮或磷离子束对玉米，小麦、水稻、黑麦等植物种子进行离子注入的处理，在处理的当代种子及以后几代种子中均出现显著的生物效应变异，如发芽率，生长速度植物株型等，染色体行为也出现异常。     

水化学因素对集输管线腐蚀的影响

用电化学方法研究了水化学因素对套管钢在模拟油田水中腐蚀的影响，包括亚硫酸钠除氧效果、溶解氧浓度、氯离子浓度、介质温度对腐蚀的影响，得出了将腐蚀速率控制在石油部行业标准ＳＹ５３２９—８８中规定的腐蚀速率的临界溶氧浓度、氯离子浓度和温度值。