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Staphylococci exist in air, dust, sewage, water, milk and food or on food equipment, environmental surfaces, humans and animals. Humans and animals are the primary reservoirs. Staphylococci are present in the nasal passages and throats and on the hair and skin of 50 percent or more of healthy individuals. A wide range of foods maybe involved in Staphylococcal food poisoning including ham, turkey, chicken and chicken salad, baked products, especially filled pastries, table ready-meats (sausage etc.), precooked frozen foods and dairy products.
S. aureus cells are relatively more resistant than many gram negative food spoilage organisms. Human intoxication is caused by ingesting enterotoxins produced in food by strains of S. aureus, usually because the food has not been kept hot enough (60ºC, or above) or cold enough (7.2ºC, or below). In frozen foods they may survive even at -10ºC. In general, survival of S. aureus is best in foods that contain high concentration of sugars, eggs and buffering component such as phosphates and protein. Salt concentration less than 9.5%, temperature more than 20ºC and a pH in the range 6-8 are favourable for growth and enterotoxin formation.
What is biodiversity? Biological diversity is the several of species of living beings of an ecosystem. In ecosystems which are more bio diverse, as tropical forests, a great va
Q. Treatment of angina pectoris? Proper and careful treatment of the underlying cause (usually dyslipidemia, advanced atherosclerosis or sever chronic hypertension) is imperati
classification on taxonomy
Explain about the Vitamin D? Vitamin D is a generic term and indicates a molecule of the general structure with rings (A, B, C, D), as you may have noticed in Figure B. The ri
Is there interphase again between meiosis I and meiosis II? There is no interphase nor DNA duplication among the divisions of meiosis. Only a short interval called diakinesis h
Assighments of chara
Q. Fish identity card. How are fishes characterized according to examples of representing beings, skin, basic morphology, circulation, nitrogen waste, respiration, thermal control
What is a distilling flask and how is it used? A distilling flask is a round bottom flask that often has two openings, and some of them have a long neck.
negative and positive feedback
Chiropterophily - Cross-pollination Pollination brought about by bats is called cheiropterophily. Bats which feed at night and do not see very well, are frequent pollinators i
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