以钴了子为探针测定半胱氨酸的研究

详细研究了半胱氨酸与钴（Ⅱ）在ＮＨ４ＣＬ－ＮＨ４ＯＨ介质中的相互使用，建立了快速测定半胱氨酸的分光光度法，方法检出限２．８×１０＾－６ｍｏｌ·Ｌ＾－１，线性范围０－２．×１０＾－４ｍｏ１·Ｌ＾－１，摩尔吸光系数７．９８×１０＾３Ｌ·ｍｏｌ＾－１·ｃｍ＾－１。用于尿液中半胱氨酸的测定，结果满意。     

1-(间硝基苯基)-3-(2-氨基噻唑)三氮烯与钯(Ⅱ)的显色反应及其分析应用

研究了一个新的三氮烯类试剂：１－（间硝基苯基）３－（２－氨基噻唑）三氮烯（ｍ－ＮＰＡＴＴ）,在Ｔｗｅｅｎ８０存在下与钯（Ⅱ）显色反应。结果表明,在ＰＨ８．０－１０．０范围内,钯（Ⅱ）与ｍ－ＮＰＡＴＴ形成１：２的稳定络合物,其表观摩尔吸光系数在４７５ｎｍ处为６．８２＊１０＾４。钯量在０．１０－１０．０μｇ／１０ｍＬ范围内符合比尔定律。对３０多种共存离子进行试验,除Ｃｕ＾２＋,Ａｇ＾２＋,Ｃｄ＾２＋,Ｈｇ＾２＋稍有干扰外,其余离子均不干扰测定,用该方法测定了催化剂中钯的含量,结果满意。     

二溴甲基偶氮羧胂直接光度法测定富钙材料中的稀土

二溴甲基偶氮羧胂在０．１６－０．６ｍｏｌ／Ｌ的盐酸介质中能与铈组形成蓝色的配合物，摩尔吸光系ε６３０（Ｌａ－Ｇｄ）为（１．２５－１．４１）×１０＾５Ｌ．ｍｏｌ＾－１ｃｍ＾－１。铈在０－１２μｇ－２５ｍＬ符合比耳定律。由于乙醇和表面活性剂ｔｒｉｔｏｎＸ－１００的存在，方法具有良好的选择性，４０ｍｇＣａ＾２＋，１０ｍｇＦｅ＾３＋，３ｍｇＴｉ＾４＋不干扰测定。本法用来测定富钙材料中的铈组稀土，结果令人满     

催化剂中微量铂的催化极谱测定

本文研究并提出了催化极谱法测定催化剂中微量铂的体系。０．１５ｍｏｌ／Ｌ磷酸氢二铵－０．５ｍｏｌ／Ｌ硫酸４．０×１０＾－３ｍｏｌ／Ｌ六次甲基甲胺底液中,于－１．０２伏（ｕＳ．ＳＣＥ）产生一灵敏的催化波,线性范围１．０×１０＾－５－８．０×１０＾－３μｇ／ｍｌ。本体系选择性好,数十种常元素无干扰,可不经分离富集直接测定催化剂中微量铂。     

铜电解液中硫脲的测定

研究了以Ｃｕ~（２＋）—ＫＢｒ—乙二胺为体系，运用单扫描示波极谱法测定铜电解液中的硫脲。硫脲在Ｃｕ~（２＋）—ＫＢｒ—乙二胺体系中，在单扫描示波极谱上具有灵敏的阴极导数波。二阶导数波高与硫脲浓度在３×１０~（－７）ｍｏｌ／Ｌ～４．５×１０~（－６）ｍｏｌ／Ｌ时有良好的线性关系，相关系数为０．９９９９，检测限可达５×１０~（－８）ｍｏｌ／Ｌ。     

磷钼蓝光度法测定电解金属锰中的痕量磷

本文用稀磷酸－高氯酸对试样进行前处理，试验了磷钼蓝显色条件及配合物的光度性质＾［１￣６］。酸度条件：Ｃ（ＨＣ１Ｏ４）为０．１７ｍｏｌ·Ｌ＾－１、Ｃ（Ｈ２ＳＯ４）为０．０２０ｍｏｌ·Ｌ＾－１。磷０￣１０μｇ·５０ｍｌ＾－１遵守比耳定律，ε７２０为２．００×１０＾５（２８Ｃ），与标准加入法的分析结果相符。     

冶金产品中Co（Ⅲ）的测定方法研究

提出了在Ｈ２ＳＯ４介质中,加入定量的ＦｅＳＯ４．（ＮＨ４）２ＳＯ４作为Ｃｏ＾３＋的还原剂,通过测定过量的Ｆｅ＾２＋而间接地测定Ｘｏ＾３＋。讨论了介质、还原剂、浸取手段、酸度、浸出时间、还原剂的浓度及干扰离子等因素对测定结果的影响。方法操作简便、快速。对高含量的Ｃｏ＾３＋的测定,效果尤佳。     

5—（2—噻唑）偶氮—8—氨基喹啉的合成及光度法测定微量钴

合成了新试剂５－（２－噻唑）偶氮－８－氨基喹啉，测定了它的酸离解常数，并用于光度法测定微量钴。在ＣＴＭＡＢ存在下，０．０４－０．０２ｍｏｌ／ｌ ＮａＯＨ介质中，ＴＡＡＱ与Ｃｏ＾２＋形成１：３的深蓝色络合物，最大吸收峰位于６３０ｎｍ，摩尔吸光系数ε＝１．２３×１０＾５ｌ·ｍｏｌ＾－１·ｃｍ＾－１。Ｃｏ＾２＋在０－１０μｇ／２５ｍｌ范围内符合比尔定律。方法具有较好的选择性，已用于ＶＢ１２及矿石分析，结     

液膜分离富集CN^—与测定水中氰化物

用ＴＢＰ－ＰＭＢＰ、ＳＰＡＮ８０、液体石蜡、煤油和内相（２％ＮａＯＨ溶液）乳状液膜，研究了ＣＮ＾－的迁移行为及最适宜的实验条件。ＣＮ＾－在１５ｍｉｎ内可以迁移９９．５％以上。在此情况下许多共存离子，如Ｍｏ＾６＋、Ｍｏ＾５＋、Ｆｅ＾３＋、Ａｌ＾３＋、Ｃａ＾２＋、Ｍｇ＾２＋、Ｓｒ＾２＋、Ｂａ＾２＋、ΣＲＥ＾３＋、Ａｇ＾２＋、Ｐｄ＾２＋、Ｐｔ＾４＋、Ｒｈ＾３＋、Ｃｕ＾２＋、Ｐｂ＾２＋、Ｚｎ＾２＋、Ｗ＾６     

MnO2·xH2O共沉淀分离5—Br—PADAP—OP水相光度法测定Cu部的Sb

基于ＨＮＯ２介质中ＭｎＯ２·ｘＨ２Ｏ能分离富集锑继而利用Ｓｂ（Ⅲ）与ＫＩ的铬阴离子［ＳｂＩ４］＾－在１．１￣１．８ｍｏｌ／Ｌ的Ｈ２ＳＯ４介质中与偶氮类显色剂５－Ｂｒ－ＰＡＤＡＰ形成的离子缔合物，在乳化剂ＯＰ存在下，有较高灵敏度与选择性，可不经萃取分离水相光度法测定Ｃｕ中锑。线性范围０￣４０μｇ／２５ｍＬ，ε６１０＝４．３×１０＾４。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.