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11) in Cryogenic StorageBakteriofah, viruses, yeasts, fungi, some types of algae, and protozoa can be stored for long in the freezing conditions in a manner largely reduce the activity or according to speed. The Microbe has been stored in a freezer-temperature-20o C and 70o c.-the lower storage temperatures, the smaller the chance of loss of viabilitasnya. Storage at temperatures higher than-70o C should be done not too long, the longest a year. Microbial storage at a temperature so low (ultra-low temperatures) by way of freezing in liquid nitrogen which incorporates 196o-C gives researchers opportunities keep microbes use simple raw technique that has proved its success to store various types of microbes and mammalian cells with kehilang-an extremely low viability and stability of the high genetic Moore and Carlson, 1975). Different types of bacteria can be frozen directly in the growing medium, but the addition of the krioprotektan compounds such as glycerol or dimethylsulfoxide (DMSO) can reduce the negative impact (stress) from freezing. Other Krioprotektan that can be used is methanol, sakarida, starch, sugar and polyvinyl pyrollidone (PVP). Some krioprotektan compounds are toxic and negatively impact microbes, especially during freezing and thawing the saved culture. Therefore, these compounds need to be diluted in advance or eliminated altogether at the time established back microbes. The freeze on the process of cryopreservation should preferably be carried out slowly and managed to reach a temperature of-40 ° C or-0o C, subsequently cooled rapidly until it reaches the final temperature cooling (196o-C). Freezing can quickly result in the formation of ice crystals in space antarsel and electrolyte imbalance which can be deadly or damaging cells. Disbursement of microbial culture that is stored should be done quickly. In General, bacteria, yeasts, and fungi are more resistant to damage by freezing at-compare with algae, protozoa or breeding network.
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