PanSci Pan Taiwan Science Digital Culture Association to promote scientific literacy mccain home fr

Spoilage occurs because the microorganisms (bacteria or fungi) growth needs nutrients, moisture and suitable temperature and pH and other conditions. In general, most of the food is not the lack of nutrients, only a few such as liquor, salt, etc., can not support microbial growth. The water is a prerequisite for the growth of bacteria and mold, this condition is not intuitive "water content", but the "water activity." It is not only concerned with the water content of food, water and even went to combine state of the food. Simply put, that is, when the water content of food to some small extent, bacteria and mold can not grow up. Such as sugar, honey, dehydrated vegetables, noodles, etc., because the water content is very low so it is difficult spoilage. Temperature and acidity are environmental conditions for microbial growth. In general, the higher acidity (lower pH value), the more difficult the growth of microorganisms. The temperature range is particularly needs an appropriate, too low will not work. In addition, the growth of microorganisms still need some "seed", so "seed" If you can not let the microorganisms exposed to food, even if there is suitable for the growth of bacteria and mold the environment, mccain home fries food will not spoil.
Microorganism to be grown, need to satisfy all the conditions described above. And corrosion, it can only get one. Of course, because every one wants "to completely fix" mccain home fries is not easy, the reality is often a multi-pronged, so microbes have "escaped the first day become mccain home fries obvious to fifteen." Dry. This may be the first human to understand the anti-corrosion measures. mccain home fries Those perishable food, as long as the deterioration of dried or drying before, it can be a long-term preservation. In addition to food, a lot of traditional food that is so saved. In rural areas, many people will carrots, sweet potatoes, beans, bamboo shoots, potato chips, dried mushrooms, etc., you can save a long time. Even the meat, with the help of high salt under the surface to dry, you can also achieve corrosion - bacon, wind meat, sausages, are true. Processed foods, instant noodles is the spokesman for this technology. Whether fried or air-dried, mccain home fries surface water activity below the minimum requirements for bacterial mccain home fries growth, it does not need preservatives. Then they do not Kaifeng moisture, corrosion of instant noodles dry enough. Saline. Most bacteria in high salt environments that are difficult mccain home fries to grow. In addition to the aforementioned bacon, the core of various pickles, pickles are also high salt corrosion. mccain home fries Candied. Core or high-sugar environment of low water activity of the anti-corrosion measures, mccain home fries a variety of preserves on behalf of this measure. mccain home fries Hypothermia. In freezing temperatures (below -18C), mccain home fries although let food spoilage microorganisms is not dead, but it stopped the toss, can not grow. They do not thaw, they will not be able to make trouble. Canned. Canned food by first seal, then thoroughly heated way to corrosion. After a long period of high temperature heating, in which the bacteria were killed mccain home fries light. mccain home fries As it has been sealed, mccain home fries the bacteria in the environment mccain home fries can not enter. No spark, no matter how fit inside food cans, the bacteria would not have to grow up. "Ultra-high temperature heating and aseptic packaging" is another commonly used programs on the food industry. The principle is the same as with the cans, but also kill bacteria by ultra-high temperature heating, and then aseptically packaged to prevent bacteria mccain home fries from entering to achieve corrosion without the need for preservatives. Can be stored at room temperature milk and lunch on the train is well known consumer representatives.
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Why do we always see their article typo? 2014/11/21 When we finally finished article, but also carefully checked several times, first noticed the reader is not written in your heart [...]
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