Figure 2From: The fast milk acidifying phenotype of Streptococcus thermophilus can be acquired by natural transformation of the genomic island encoding the cell-envelope proteinase PrtSMilk acidification kinetics of srtA and prtS mutants. Milk acidification curves of the parental strain DGCC7710 (black diamonds), and its respective SrtA- (∆srtA::lox66-P32-cat-lox71; red crosses) and PrtS- (∆prtS:: lox66-P32-cat-lox71; green triangles) derivatives. All experiments were performed in the reconstitued milk at 40°C.Back to article page