Survival and growth of Escherichia coli O157:H7 on salad vegetables

Article Abstract:

Escherichia coli O157:H7 was originally associated with food-related outbreaks of hemorragic colitis in the US. The effects of modified-atmosphere packaging, storage temperature and time on the behavior of O157:H7 on shredded lettuce, sliced cucumber and shredded carrot were investigated. The results showed that modified atmosphere had little effect on the growth of O157:H7. The most rapid growth was observed at 21 degrees celsius on cucumber and lettuce. The results indicate that precautions should be taken to prevent O157:H7 contamination during processing and storage of raw salad vegetables.

Vegetables, Contamination, Microbial contamination

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Survival and growth of Escherichia coli O157:H7 in ground, roasted beef as affected by pH, acidulants, and temperature

Article Abstract:

Escherichia coli showed noticeable increase (P less than or equal to 0.05) in populations of the organism in salads which have 16 to 32% mayonnaise between the 10th and the 24th hour of incubation at 21-30 degrees centigrade. Death occurred at a faster rate when the pH of acidified beef slurries incubated at 5 degrees centigrade was reduced from 5.98 to 4.70. Escherichia coli multiplied in control slurries and in slurries containing citric and lactic acids (pH 5.00 and 5.40 respectively) incubated at 21 degrees centigrade.

Growth

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Ethanol-mediated variations in cellular fatty acid composition and protein profiles of two genotypically different strains of Escherichia coli O157:H7

Article Abstract:

The effects of ethanol-mediated variations in cellular fatty acid composition and protein profile of two genetically different strains of Escherichia coli O157:H7 are studied. Phenotypic modifications in cellular fatty acid composition and protein profiles in response to ethanol stress are experienced by the two strains of Escherichia coli O157:H7.

Science & research, Industrial organic chemicals, not elsewhere classified, Ethyl Alcohol Manufacturing, Ethanol Fuel, Ethanol fuels, Fatty acid metabolism

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