| 摘要 |
A method is disclosed for growth acid-producing bacterial cultures, such as diary cultures, wherein the culture is selected to contain a urease-producing strain of bacteria and the medium used for the culturing contains added urea. During culturing the urease hydrolyzes the urea to acid-neutralizing ammonia which limits the pH drop of the medium, thereby producing cultures of higher bacterial activity. The urea-containing culture media can also be employed with bacterial cultures which do not produce urease, providing urease is added to the culture medium during growth of the bacteria.
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