高温镍基合金中痕量元素碲的测定方法研究

本方法研究了高温镍若合金中痕量元素碲的分析，使用PE－5100ZL型原子吸收光谱仪，不经分离样品基体，采用标准加入法和绝对分析法，用平台石墨炉原子吸收技术测定高温镍基合金中的痕量碲，两种方法相对照，结果比较理想。     

砷的检测方法进展

砷是自然界广泛存在的一种元素,在工业和环境保护方面意义重大。检测砷的方法有:氢化物-原子荧光光谱法、X荧光光谱法、原子吸收光谱法、紫外及可见分光光谱法、比色法、原子发射光谱法、质谱法、电化学法、化学发光法、生物法、容量法等,覆盖从痕量到常量砷的检测。小型化的便携X荧光光谱法因能快速测定砷等数十个元素,发展迅猛。生物法检测砷发展前景诱人。     

高温镍基合金中痕量元素铅的测定

本文介绍高温镍基合金中痕量元素铅的测定方法,使用ＰＥ－５１００型原子吸收光谱仪,不需分离样品基体,采用标准加入法,直接用平台石墨炉原子吸收法测定高温镍基合金中的痕量铅。该方法简便,分析速度快,且灵敏度,精密度能满足要求。     

铝及铝合金中元素分析的标准应用现状与方法研究进展

从中国国家标准、中国有色行业标准、中国航空行业标准、中国进出口检验检疫行业标准、ISO国际标准、日本标准、欧洲标准、美国材料与试验协会(ASTM)标准等160余项国内外标准分析方法的角度,介绍了各区域和行业的标准分析方法现状。结合文献(期刊论文)方法,进一步综述了湿法化学分析方法和现代仪器分析方法及试样制备与预处理方法在铝及铝合金50余种元素项目分析中的应用现状和研究进展,重点评述了紫外-可见分光光度法、滴定法、重量法、电化学方法、火花放电原子发射光谱法、X射线荧光光谱法、原子吸收光谱法、电感耦合等离子体原子发射光谱法、质谱法、红外吸收法、热导法等分析方法的基本特点、测定范围和应用实例。引用文献74篇。     

高纯碱金属盐中杂质测定方法的研究进展

高纯碱金属盐的纯度对其应用有很大影响,痕量杂质元素含量的严格控制和准确测定非常重要。本文对高纯碱金属盐中的杂质分析方法（原子吸收光谱法、分光光度法、电感耦合等离子体光谱法、电感耦合等离子体质谱法、离子色谱法等）进行了综述。     

地球化学样品中微量锗的分析进展

对地质样品中微量和痕量锗的分析方法进行了综述, 介绍了酸溶和碱熔的前处理方法、分离与富集方法以及锗的测定方法, 包括极谱法、石墨炉原子吸收光谱法、原子荧光光谱法、电感耦合等离子体原子发射光谱法和电感耦合等离子体质谱法, 并对锗的分离和分析方法进行了展望。     

氢化物原子吸收法测定钢铁和高温合金中的砷

近年来一些文献报导了用氢化物原子吸收法测定水、钢铁、矿石中的砷,但镍基合金中砷的测定尚末见有报异。镍钴等元素严重抑制砷的信号。我们试用加入邻菲罗啉以消除这些元素的干扰。拟定了用半自动氢化物装置分析镍基合金和钢铁中痕量砷(0.01～0.0001％)的方法。     

钨及其化合物中杂质元素的分析进展

综述了1991~2004年以来钨及其化合物中杂质元素分析方法的进展,包括原子发射光谱法、原子吸收光谱法、分光光度法、质谱法、电化学分析法等。从测定体系与测定条件、分析方法的检出限、干扰情况和测定范围等方面加以归纳和概括。共引用文献60篇。     

微波消解-电感耦合等离子体原子发射光谱法测定镍基合金中硅

使用盐酸-硝酸-氢氟酸以及微波消解的方式溶解镍基合金样品,选择Si 251.611 nm或Si 288.158 nm为分析线,Ar 420.069 nm为内标元素谱线,并用两点校正法扣除背景,采用基体匹配法配制标准溶液系列并绘制校准曲线以消除基体效应的影响,建立了使用电感耦合等离子体原子发射光谱法(ICP-AES)测定镍基合金中硅的分析方法。硅质量分数在0.008%～5.00%范围内(Si 251.611 nm),以及硅质量分数在0.015%～5.00%范围内(Si 288.158 nm)分别与其发射强度呈线性,相关系数均大于0.999;方法中硅的检出限不大于0.005%(质量分数)。方法应用于镍基合金样品中硅的测定,结果的相对标准偏差(RSD,n=10 )小于1%。按照实验方法测定镍基合金标准样品中硅,测定结果与认定值相吻合。     

固体进样石墨炉原子吸收光谱法直接测定镍基高温合金中微量铋

本文介绍一个测定镍基合金中鉍的快速简单的方法。它基于固体进样石墨炉原子吸收光谱法。含0.5ppm铋试样的15次测定结果的相对标准偏差约7.5％。四种合金的分析结果分别与它们的对照结果吻合。     

Benzimidazole resistance in cyathostomes in horses in the Ukraine

The efficacy of treatment with cambendazole was tested in 1-year-old horses on a farm in Dubrovka, Ukraine. Thirty-five horses were treated. Their egg output was compared on the day of treatment and 14 days later with that of 33 untreated horses. Before treatment the mean number of eggs g-1 faeces was 614 in the controls and 766 in horses that had been treated. After 14 days the mean egg output in the controls was 580 and in the treated horses 369. This means a reduction of 54.5%. Only cyathostome larvae could be cultured from faeces collected after treatment. It can be concluded that benzimidazole resistance in cyathostomes is present in the Ukraine.     

重庆高校推进产学研合作的案例分析

以重庆大学、重庆邮电大学和重庆理工大学为例,剖析重庆高校推进产学研合作的基本模式,已经取得的突出成绩,分析总结其基本经验.从完善政策法规体系、强化经济调控、建立组织机构、加强中介建设及开展国际产学研合作等方面,提出了深入推进重庆高校产学研合作的对策建议.     

Apoptosis in experimental myocardial infarction in situ and in the perfused heart in vitro

We report the appearance of apoptotic cells in experimental myocardial infarction (rabbit heart) in in situ and in vitro preparations. Apoptosis was recognized by intravital staining with Hoechst 33342 (Ho342), by nick-end labeling (TUNEL) and by DNA laddering. A steady rise in the relative number of apoptotic cardiomyocytes (apoptotic index) was noted in in situ preparations. Apoptosis was first noted 6 h after the onset of ischemia with its highest value occurring after 72 h. Apoptotic nuclei were absent in remote areas of the left and right ventricles. Apoptotic nuclei within the infarcted area showed diminished intensity of Ho342 fluorescence. Three days after ischemia, a border zone adjacent to the infarcted area consisting of apoptotic macrophages was recognized. A novel finding was the appearance of apoptotic cardiomyocytes in the isolated perfused ischemic heart. Occurring as early as 50 min after the onset of ischemia, a high apoptotic index was present adjacent to the ligature placed around the coronary artery. This observation provides the opportunity to selectively examine factors leading to apoptosis in the ischemic heart under controlled experimental conditions.     

Fractures in childhood in Khartoum

A prospective study of fractures in 231 children received at Khartoum North Teaching Hospital(KNTH) was carried out for a period of six months. The incidence of child fracture rated as one per day, then it increased from the age of 5 years onwards in boys and between 6 and 8 years in girls. Most injuries were sustained during the day time, especially between late afternoon and sunset. 82% of injured children presented to a medical facility, while 18% were taken to native healers first. Non-road traffic accidents accounted for 84% of the fractures mainly due to sports, domestic injuries and falls; whereas road traffic accidents were 16% and occurred mainly in pedestrians. Forty three percent of the fractures needed only first aid and splintage while 42% needed closed reduction. Thirty one percent of all patients were treated as inpatients. The long bones were affected in 91% of all fractures, the commonest site being the distal end of the forearm (26%), followed by supracondylar fracture of the humerus (15.6%). In the upper limb, left-sided fractures predominated. The epiphyseal injuries were 3.5% of all fractures, mainly at the distal radial epiphysis. Boys were commonly affected between 13-15 years of age. Open fractures constituted 9.8% of the series and were mainly due to traffic accidents in town dwellers, the most vulnerable bones were those of the leg and foot. Pathological fractures accounted for 2.2% and were due to bone cysts and osteogenesis imperfecta. The problem of child safety and the preventive measures need to be more stressed.     

Botulism in Poland in 1996

A model is presented in which ion translocation through the F0 part of the ATP synthase drives the rotation of the ring of c subunits (rotor) versus the a subunit (stator). The coupling ion binding sites on the rotor are accessible from the cytoplasm of a bacterial cell except for the c subunit at the interface to the stator. Here, the binding site is accessible from the periplasm through a channel formed by subunit a. In the ATP synthesis mode, a coupling ion is anticipated to pass through the stator channel into the binding site of the adjacent rotor subunit, following the electrical potential. Occupation of this site triggers, probably by electrostatic forces, the rotation of the ring. This makes the binding site accessible to the cytoplasm, where the coupling ion dissociates. Simultaneously, this rotation moves again an empty rotor subunit into the contact site with the stator, where its binding site becomes loaded and rotation continues.     

Problems in falling in love

Certain patients enter psychoanalysis because of their inability to love another person. Often they report a repetitive erotic pursuit of desired partners, without being able to experience or maintain loving feelings. Kernberg has understood such difficulties as representing effects of early narcissistic disappointments and/or of difficulties in resolving oedipal conflicts. In this paper, Lacanian concepts of the mirror phase and symbolic love are employed to develop these issues. Sexualization of problems in mirroring may be fused with oedipal conflicts in some cases. An extended vignette is presented to illustrate the technical and theoretical issues.