水分活度对金黄色葡萄球菌产肠毒素B及生长的影响
Effect of water activity on enterotoxin B production and growth of Staphylococcus aureus.
作者信息
Troller J A
出版信息
Appl Microbiol. 1971 Mar;21(3):435-9. doi: 10.1128/am.21.3.435-439.1971.
Abstract
Staphylococcus aureus C-243, an enterotoxin B-producing strain, was cultured on media adjusted to various water activity (a(w)) levels by means of two different solute systems. Total numbers and rate of growth were diminished at low a(w) levels, and enterotoxin synthesis was extremely sensitive to reduction in a(w). A reduction of a(w) from 0.99 to 0.98 in one medium and from 0.99 to 0.97 in the other medium resulted in extremely low levels of enterotoxin in spent culture media despite the attainment of high numbers of staphylococci.
摘要
金黄色葡萄球菌C - 243是一株产生肠毒素B的菌株，通过两种不同的溶质系统在调整到不同水分活度（a(w)）水平的培养基上进行培养。在低a(w)水平下，细菌总数和生长速率降低，并且肠毒素合成对a(w)的降低极为敏感。在一种培养基中，a(w)从0.99降至0.98，在另一种培养基中从0.99降至0.97，尽管葡萄球菌数量很多，但在废弃培养基中肠毒素水平极低。
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