1生物膜的概念细菌生物膜是指在多聚糖、蛋白质和核酸等组成的基质内相互粘连粘附于物体表面的细菌群体[1]。生物膜可以由一种或几种细菌混合生长而成。乳酸乳球菌与萤光假单胞菌混合形成的生物膜就是一个典型的例子。乳酸乳球菌自身不易形成生物膜,但可以提供给萤光假单胞菌乳酸作为养料,而萤光假单胞菌帮助乳酸乳 1 The concept of biofilm Bacterial biofilm refers to the polysaccharides, proteins and nucleic acids within the matrix adhesion to each other adhesion to the surface of the bacterial population [1]. Biofilms can be mixed with one or more bacteria. The biofilm formed by mixing Lactococcus lactis and Pseudomonas fluorescens is a good example. Lactococcus lactis is not easy to form biofilms by itself, but it can be provided to Pseudomonas fluorescens lactic acid as a nutrient while Pseudomonas fluorescens helps lactate