Lecture+18+water+activity+and+pH+effects+_color_

Lecture+18+water+activity+and+pH+effects+_color_ - Majority...

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Majority of dairy-related disease outbreaks linked to raw milk Date: 21.feb.12 The rate of outbreaks caused by unpasteurized milk (often called raw milk) and products made from it was 150 times greater than outbreaks linked to pasteurized milk , according to a study by the Centers for Disease Control and Prevention. The 13-year review also revealed that the states where the sale of raw milk was legal had more than twice the rate of outbreaks as states where it was illegal. The study, published Feb. 21 in the CDC journal Emerging Infectious Diseases, reviewed dairy product outbreaks from 1993 to 2006 in all 50 states. “This study shows an association between state laws and the number of outbreaks and illnesses from raw milk products,” …“Restricting the sale of raw milk products is likely to reduce the number of outbreaks and can help keep people healthier. The states that allow sale of raw milk will probably continue to see outbreaks in the future.” The study also found that the raw milk product outbreaks led to much more severe illnesses, and disproportionately affected people under age 20. Children are more likely than adults to get seriously ill from the bacteria in raw milk. WATER ACTIVITY & ACIDS FST104 February 24, 2012
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Theoretical scale 0 to 1 (pure H 2 O = 1) Water activity ranges Biologically relevant scale: 0.6 to 0.999 Nothing grows at a W <0.6 Highest actual value encountered = 0.996 (physiological saline) Water activity and growth Most organisms grow best at a W ~0.97-0.99
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Lecture+18+water+activity+and+pH+effects+_color_ - Majority...

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