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Psychrotrophic bacteria

    Psychrotrophic bacteria are bacteria that are capable of surviving or even thriving in a cold environment. They can be found in soilshttp://www3.interscience.wiley.com/journal/120081154/abstract?CRETRY=1&SRETRY=0, in surface and deep sea watershttp://www.springerlink.com/content/0kcy3gl47cftrj0w/, and in foodshttp://www.encyclopedia.com/doc/1G1-14605181.html.
    Psychrotrophic bacteria are of particular concern to the dairy industryhttp://www.leonthemilkman.com/2006/03/18/the-case-of-psychrotrophic-bacteria/. Most are killed by pasteurization; however, they can be present in milk as post-pasteurization contaminants due to less than adequate sanitation practices. According to The Food Science Department at Cornell University, psychrotrophs are bacteria capable of growth at temperatures at or less than 7°C (44.6°F). At freezing temperatures, growth of pyschrotrophic bacteria becomes negligible or virtually stops. Steven C. Murphy, "Shelf LIfe of Fluid Milk Products -- Microbial Spoilage", Food Science Department, Cornell University. Retrieved 22 November 2009.
    Psychrotrophic bacteria also fall under the more general category of psychrophiles.