Kozlova Iu I, Golikova T I, Baranova I P, Egorov N S
Mikrobiologiia. 1979 May-Jun;48(3):443-6.
When the pH of the medium was maintained at the level of 6.6--6.8 and the content of KH2PO4 in it was decreased, the biosynthetic activity of Streptococcus lactis, strain MGU, became lower. The culture assimilated low quantities of phosphorus from KH2PO4 at a high concentration of this salt in the medium; presumably, the culture required large quantities of potassium ions. If the pH of the medium is maintained at a constant value, the fermentation can be stopped 21 hr after the beginning of cultivation of Str. lactis, strain MGU.
当培养基的pH值维持在6.6 - 6.8水平且其中KH₂PO₄含量降低时，乳酸链球菌MGU菌株的生物合成活性会降低。在培养基中该盐浓度较高时，培养物从KH₂PO₄中吸收的磷量较少；据推测，该培养物需要大量钾离子。如果将培养基的pH值维持在恒定值，在乳酸链球菌MGU菌株培养开始21小时后发酵可以停止。
