洗涤剂最新发展动态探讨

对洗涤剂市场发展趋势作了简要分析和评述,主要讨论了洗涤剂用表面活性剂、洗涤助剂、酶制剂、漂白剂、杀菌剂和洗涤用品的最新发展和技术动态.     

固定化酶管式热敏传感器的数学模型及其应用——发酵产物浓度的测定

利用微元段内的物料与热量平衡,对固定化酶管式热敏传慈器进行了考察,建立了用联立双曲型偏微分方程组描述的数学模型。该模型用于具体的发酵产物浓度测试,所得出的输入浓度与输出温差之间的关系具有Monod方程的形式,其度化趋势较好地反映了实测结果。     

利用热重法(TG)确定煤的活化能

运用热重分析手段对煤从常温到燃点之间的氧化热解过程进行了研究.通过不同动力学机制模型函数分别对热重分析数据进行处理和相关性分析,结果表明,煤炭氧化热解过程符合一级化学反应动力学机制,据此求出了活化能.结合算例求出了4种煤样的活化能.运用此方法确定煤的活化能快捷、方便.     

贵州大学生心理健康状况主要影响因素的调查分析及对策

以贵州师范大学和贵州大学的学生为研究对象,研究了他们的心理健康状况,发现其心理问题主要表现在强迫、人际关系敏感、敌对、偏执和精神病性五个方面。而影响其心理健康状况的因素中,人际关系需要和情感调适需要是非常重要的因素,同时影响其健康状况的还有活动性的性格特点。认知领悟疗法可以改善其心理健康状况。     

多胺在真核生物DNA复制过程中对聚合酶和解旋酶的作用

多胺存在于一切细胞中,调控着细胞的生长、增殖、分裂和分化.本文着重阐述了多胶在真核生物DNA复制过程中对聚合酶和解旋酶的作用.     

活化条件对活性白土脱色率的影响研究

以内蒙古杭锦2#土为原料,用盐酸为活化剂,湿法制备了活性白土,研究了液固比、盐酸浓度、活化时间、活化温度对活性白土脱色性能的影响.结果表明,脱色的最佳条件为液固比2.5∶1,盐酸浓度15%,活化时间4h,活化温度(90±1)℃.     

Containerless solidification of Zr41Ti14Cu12.5Ni10Be22.5 glass-forming alloy in drop tube

Droplets of Zr41Ti14Cu12.5Ni10Be22.5 glass form-ing alloys with different sizes are solidified in a drop tubecontainerless processing. Glass transition behavior, crystal-lization kinetics, and the phase evolution during annealing of the Zr41Ti14Cu12.5Ni10Be22.5 glassy spheres are investigated. The experimental results indicate that the apparent activation energy of the glass transition (Eg = 435.5 kJ/mol), and the activation energy of the main crystallization reaction (Ep1 = 249.6 kJ/mol) are obviously different from those of bulk glass samples prepared by water quenched (Eg = 559.1 kJ/mol and Ep1 =192.5 kJ/mol). The difference is discussed in the view point of the atomic configuration of the liquid state of the metallic glass and nucleation mechanism.     

Ag-Cu、Ag-H_(62)复合电接点材料界面的原子扩散行为

用扫描电镜能谱分析半定量和定量测定,经不同热处理工艺的Ag-Cu、Ag-H_(62)冷复合和磁控溅射复合电接点材料界面的成分分布,计算了扩散系数激活能实验表明,材料复合界面是金属键结合。     

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.     

A novel fibrinolytic enzyme (nattokinase) in the vegetable cheese Natto; a typical and popular soybean food in the Japanese diet

Summary A strong fibrinolytic activity was demonstrated in the vegetable cheese Natto, which is a typical soybean food eaten in Japan. The average activity was calculated at about 40 CU (plasmin units)/g wet weight. This novel fibrinolytic enzyme, named nattokinase, was easily extracted with saline. The mol. wt and pI were about 20,000 and 8.6, respectively. Nattokinase not only digested fibrin but also the plasmin substrate H-D-Val-Leu-Lys-pNA (S-2251), which was more sensitive to the enzyme than other substrates tried. Diisopropyl fluorophosphate and 2,2,2-trichloro-1-hydroxyethyl-o,o-dimethylphosphate strongly inhibited this fibrinolytic enzyme.