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Relationship of Cellular Components to the Stability of Concentrated Lactic Streptococcus Cultures at -17 C

机译：细胞成分与-17℃浓缩乳酸链球菌培养物稳定性的关系

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Concentrated cultures of lactic streptococci varied with respect to survival at -17 C. Cells of each strain grown at pH 6.0 were more stable to freezing than were those grown statically. The lipid fraction of the cells from static cultures was important in preventing death during freezing. As the percentage of octadecenoic acid in the cellular lipids from different cultures increased, the percentage of survivors decreased. Capsular material associated with cells from cultures grown both statically and at pH 6.0 was also important in protecting the cells at -17 C. The amount of capsular material, measured as percentage of cellular glucose, varied among the cultures tested. Cultures containing larger amounts of the capsular material were more resistant to the stress of freezing than those containing low levels.
机译：乳酸链球菌的浓缩培养物在-17 C时的存活率方面有所不同。在pH 6.0下生长的每个菌株的细胞比静态生长的细胞更稳定地冷冻。静态培养物中细胞的脂质部分对于防止冷冻过程中的死亡很重要。随着来自不同培养物的细胞脂质中十八烯酸百分比的增加，幸存者的百分比降低。与来自在静态和pH 6.0下静态培养的细胞相关的囊状材料对于保护-17 C的细胞也很重要。以细胞葡萄糖的百分数衡量的囊状材料的量在测试的培养物中会有所不同。含有少量荚膜材料的培养物比含有少量荚膜材料的培养物更能抵抗冻结压力。

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