Ⅴ-Ti催化剂低氧催化氧化邻二甲苯制苯酐——Ⅱ.TiO_2晶体结构及助剂作用的影响

研究了V-Ti体系中TiO_2晶体结构与催化活性的联系,本系统中,当焙烧温度超过650℃,由于TiO_2由锐钛矿型转变为金红石型,使催化活性降低。助剂作用的ESCA、XRD、LRS研究表明,与通常V-Ti系催化剂不同,本催化剂由于助剂的作用,使V=O键减弱而利于活化;且随K助剂含量增加,V_2O_(4.33)晶胞的001面取向优化加强,更宜于催化活性的充分显示。     

茶叶中微量锰的新催化光度法测定

利用于氨三乙酸存在下，锰（Ⅱ）对高碘酸钾氧化二甲苯蓝ＦＦ的催化效应，建立了一个新的测定微量锰的动力学分光光度法。该法检出限为６×１０￣（－２）ｎｇ·ｍｌ￣（－１），线性范围为０．２～８．０ｎｇ·２．５ｍｌ￣（－１），常见离子基本不干扰测定。用于直接测定健齿茶和茉莉花茶中的锰含量，结果发现，锰含量分别为２２１４μｇ·ｇ￣（－１）及６４８μｇ·ｇ￣（－１）。此法简便易行，灵敏度高。     

Effect of benzene and its homologs on unit activity in various brain structures

Department of Normal Physiology, Irkutsk Medical Institute (Presented by Academician of the Academy of Medical Sciences of the USSR K. V. Sudakov.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 110, No. 7, pp. 17–19, July, 1990.     

某医院病理科空气污染现状及解决方法初探

[目的]探讨降低病理科化学试剂空气污染的有效方法. [方法]在同等条件下,关闭门窗12h后(A组)、通风排气30min后(B组)、应用空气净化装置加通风排气30min后(C组)3种情况下测定取材室甲醛浓度、技术室二甲苯浓度. [结果]A、B、C3种情况下取材室甲醛检测浓度分别为(4.35±0.28)、(0.46±0.06)、(0.39±0.02)mg/m3,技术室二甲苯浓度分别为(5.18±0.08)、(0.60±0.04)、(0.07±0.01)mg/m3. [结论]病理科常用化学试剂严重污染工作环境,通风是减少病理科污染程度的最方便、最直接、较有效方法,但有一定的局限性;空气净化装置加通风排气的应用是目前降低病理科化学试剂污染程度较为有效的方法之一.     

Preliminary study on anti-inflammation of diclofenac arginine

Ｐｒｅｌｉｍｉｎａｒｙｓｔｕｄｙｏｎａｎｔｉ－ｉｎｆｌａｍｍａｔｉｏｎｏｆｄｉｃｌｏｆｅｎａｃａｒｇｉｎｉｎｅＺｈａｎｇＴｉｅｙｕａｎ１，ＪｉｎＺｈｅｚｈｕ，ＪｉｎＺｈｅｎｇｎａｎ，ＪｉｎＬｉｍｅｉＤｅｐａｒｔｍｅｎｔｏｆＰｈａｒｍａｃｏｌｏｇｙ，Ｙ...     

新型生物组织透明剂代替二甲苯在病理制片技术中的应用研究

目的探讨BT生物组织透明剂代替二甲苯进行组织石蜡制片的效果。方法应用BT生物组织透明剂代替二甲苯作为透明剂用于组织透明制作组织蜡块,并用于石蜡切片染色前的脱蜡和染色后的切片透明。结果用本法制作的组织蜡块,经切片脱蜡后进行的常规HE、组织化学和免疫组化染色,组织细胞形态完好,无明显收缩;组织中的各种成分和抗原保存完好,染色效果好,与使用二甲苯制作的切片质量无明显差别。结论BT生物组织透明剂能够代替二甲苯在组织脱水处理过程中对组织进行透明,也可用于常规HE、组织化学和免疫组化染色前的石蜡切片脱蜡和染色后的切片透明,并符合实验室环保的要求。     

Acute bone marrow toxicity and pancytopenia following exposure to lead chromate,xylene, and ethylbenzene in a degloving injury

A case of unique acute bone marrow toxicity and pancytopenia following subcutaneous exposure to lead chromate, xylene, and ethylbenzene in a previously healthy patient is reported. The patient sustained an extensive degloving injury to his lower extremity. The wound was contaminated with traffic paint containing lead chromate pigment along with a large volume of xylene and ethylbenzene solvent. Consequences of the patient's clinical course and management of degloving injuries are discussed. © 1994 Wiley-Liss, Inc.     

空气中苯、甲苯和二甲苯的直接热解吸气相色谱测定法

本法特点是灵敏、快速、简便和不使用溶剂。用泵或注射器将含有待测物质的空气以3～5ml/s的速度通过Tenax GC吸附管。采好样后将Tenax GC管放入热解吸器中,在250℃下解吸,同时由氮气将释放以来的物质运送到色谱柱中,以氢水焰离子化检定器进行测     

空气中正己烷、苯系物同时测定的热解吸气相色谱法

目的建立工作场所空气中正己烷、苯、甲苯、二甲苯同时测定的热解吸气相色谱方法。方法按照《车间空气监测检验方法研究规范》的要求进行实验室实验及现场实验。结果正己烷、苯、甲苯、二甲苯方法的平均相对标准偏差在4．9％以内,方法的最低检测浓度均在2．4mg/m^3以内,热解吸效率均在80％以上,空气中正己烷、苯、甲苯、二甲苯等在该方法条件下可同时分别测定。结论该方法各项指标均达到《车间空气监测检验方法研究规范》的要求,适用于工作场所空气中正己烷、苯、甲苯、二甲苯的同时监测。     

An outbreak of xylene intoxication in a hospital

On January 3, 1980 an outbreak of illness occurred in 15 employees of a small community hospital. Symptoms included headache, nausea, vomiting, and dizziness or vertigo; the duration of illness ranged from 2 to 48 hours. The employees who became ill all worked in areas of the hospital served by one central ventilation system. None of the 180 persons working in other parts of the hospital developed symptoms requiring medical care. Less than 1 hour before the outbreak occurred, 1 liter of liquid xylene had been discarded down a sink drain in the pathology laboratory. Simulation experiments confirmed that xylene vapor could have been drawn into the room that contained the fan unit of the ventilation system. This outbreak illustrates an unusual route of exposure to a widely used laboratory chemical.