Marshall V M, Bramley A J
J Dairy Res. 1984 Feb;51(1):17-22. doi: 10.1017/s002202990002327x.
Growth of Streptococcus thermophilus was faster in mastitic milk, aseptically collected following intramammary infusion of Escherichia coli endotoxin, than in normal aseptically collected milk. The contribution of polymorphonuclear leucocytes (PMN), of plasma and plasmin to this stimulation has been investigated. Addition of plasmin to low cell count milk stimulated growth of the streptococcus to the same degree as mastitic milk. However, addition of plasma or PMN from blood or from milk were less stimulatory. The part played by these components in providing casein breakdown products for the weakly proteolytic Str. thermophilus in mastitic milk is discussed.
在经乳房内注入大肠杆菌内毒素后无菌采集的患乳腺炎牛奶中，嗜热链球菌的生长速度比在正常无菌采集的牛奶中更快。已经研究了多形核白细胞（PMN）、血浆和纤溶酶对这种刺激作用的贡献。向低细胞数牛奶中添加纤溶酶对链球菌生长的刺激程度与患乳腺炎牛奶相同。然而，添加来自血液或牛奶的血浆或PMN的刺激作用较小。讨论了这些成分在为患乳腺炎牛奶中蛋白水解能力较弱的嗜热链球菌提供酪蛋白分解产物方面所起的作用。
