bacteria and security_500字

　　We all know that bacteria are everywhere, even we think very "clean" washing hands are full of bacteria. Although most bacteria are harmless, but more harmless or even beneficial bacteria, also does not change the fact that harmful bacteria make us uncomfortable. People eat example of this problem, only a small part of the has nothing to do with bacteria, such as globefish poisoning or allergic to all kinds of food, most are bacteria.

　　The heat is still the most effective ways to kill bacteria. In general, when heated to 121 degrees c for 15 minutes. Even if there is no kill all bacteria, and the rest can“t climate. But many foods if heated to this level, you can“t eat. Usually the food processing, only the quantity of the bacteria was reduced to a certain concentration, won“t cause harm to people.

　　Such as milk pasteurization of so-called "milk" is to put the milk is heated to 72 degrees 15 seconds. Through such processing, bacteria amount will be reduced to one over one hundred thousand of the initial amount, although there are many, but two or three weeks in the fridge, germs don“t grow to the point of harmful to the people. If it is ultra high temperature sterilization, the milk is heated to 135 degrees or above, more than 1 seconds to kill almost all bacteria, even in room temperature can guarantee a few months there is no problem. All this, of course, is refers to the seal preservation. If these processing to have a drink on the bottle mouth, almost even if white do, one of the bacterial growth rate will increase greatly. Other foods, too.