排序方式: 共有120条查询结果,搜索用时 15 毫秒
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吕寅 《中学生数理化(高中版)》2003,(11):54-56
过氧乙酸是抗非典中使用的一种重要消毒剂,其分子式为C2H4O3. 物理性质:无色透明液体,有强烈的刺激性醋酸气味.具有弱酸性,易挥发,易溶于水和有机溶剂,熔点O.1℃,沸点105℃,饱和蒸汽压2.67(25℃)kPa,相对密度1.15(20℃),闪点41℃(35%过氧乙酸溶液)。危险性:遇明火、受热、摩擦、震动或撞击时,易发生爆炸;与有机物、还原剂、易燃物等接触或混合时,有引起燃烧、爆炸的危险;温度稍高时,易分解产生氧气;加热到 相似文献
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近几年来.小学生体力劳动的机会越来越少,尤其是城市的小学生更是如此。一些独生于女.几乎没有体力劳动。他们过着“饭来张口,衣来伸手”的生活。如此下去.其后果真是不堪设想。“热爱劳动”的光荣传统丢掉了.把孩于们也惯坏了,这是我们最不愿意看到的结果。马克思说:“体力劳动是防止一切社会病毒的消毒剂。”我们党一贯重视学生的劳动教育,过去讲“五爱”,其中之一就是“爱劳动”。我们应该重视劳动教育,发扬“热爱劳动”的光荣传统.让小学生从小养成劳动的习惯。就在我冥思苦索不知所措的时候,一次支教活动却告诉了答案。 相似文献
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近期在全球各大媒体纷纷报道,有一种威力巨大的超级病菌“食人菌”。(MRSA)目前正在美国、日本及欧洲一些国家肆虐蔓延,这种抗药性极强的“食人菌”病例.严重者须截肢,甚至死亡,“食人菌”一时引起人们的心理恐慌。 相似文献
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Characterization of predominant bacteria isolates from clean rooms in a pharmaceutical production unit 总被引:1,自引:0,他引:1
Aims: To screen for the predominant bacteria strains distributed in clean rooms and to analyze their phylogenetic relationships. Methods and Results: The bacteria distributed in air, surfaces and personnel in clean rooms were routinely monitored using agar plates. Five isolates frequently isolated from the clean rooms of an aseptic pharmaceutical production workshop were selected based on their colony and cell morphology characteristics. Their physiological and biochemical properties, as well as partial 16S rDNA sequences, were analyzed. Results showed that all the five isolates belong to Gram positive bacteria, of which three were Staphylococcus, one Microbacterium and one Bacillus species. Sensitivity tests for these bacteria isolates to 3 disinfectants showed that isolate F03 was obtuse, and had low susceptivity to UV irradiation, while isolates F02, F01 and F04 were not sensitive to phenol treatment. Isolates F04, F01 and F05 were resistant to chlorhexidine gluconate. Conclusion: Bacteria widely distributed in clean rooms are mainly a group of Gram positive strains, showing high resistance to selected disinfectants. Significance and impact of the study: Clean rooms are essential in aseptic pharmaceutical and food production. Screening bacteria isolates and identifying them is part of good manufacturing practices, and will aid in finding a more effective disinfection method. 相似文献
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市售漂白粉与漂白精的对比分析 总被引:2,自引:0,他引:2
漂白粉和漂白精是常用的漂白剂和消毒剂。本就此进行了对比,反澄清人们在认识上的一些误区。 相似文献
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常用化学消毒剂因种类不同,杀菌作用机制也不同。长期使用某种化学消毒剂,易使细菌产生耐药性,以常用的乙醇、碘酒等消毒剂对大肠埃希氏杆菌和金黄色葡萄球菌进行作用效果测试,结果发现2%的龙胆紫对这两者作用较强,5%的石炭酸和75%的酒精对这两者作用较弱。 相似文献
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