问题
问答题 简答题
简述紫外线主要杀菌的机制。
答案
参考答案:紫外线主要杀菌机理是:
①作用于微生物的DNA,使菌体DNA失去转换能力而死亡。
②破坏菌体蛋白质中的氨基酸,使菌体蛋白质光解变性。
③降低菌体内氧化酶的活性。
④使空气中的氧电离产生具有极强杀菌作用的臭氧。
简述紫外线主要杀菌的机制。
参考答案:紫外线主要杀菌机理是:
①作用于微生物的DNA,使菌体DNA失去转换能力而死亡。
②破坏菌体蛋白质中的氨基酸,使菌体蛋白质光解变性。
③降低菌体内氧化酶的活性。
④使空气中的氧电离产生具有极强杀菌作用的臭氧。
Hello, I'm Tom. I'm a middle school student. It's nice to meet you here. First, let me tell you 46 about my family. There are five people in my 47 .They are my mother, my father, my sister, my brother and I. My father is a worker. My mother is an English teacher. My sister is eighteen and my brother is sixteen. I'm fourteen. We 48 go to the same school. We all enjoy 49 football games. My 50 is in West Street. There is a big tree and some small trees around my house. The big one is a pear tree and the small ones are apple 51 . 52 there 53 any pears or apples on them now. 54 a photo of my house. In the photo, you can see three cats in my house. They are all black and white. We 55 them very much.
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