Fig. 2.

Production of lactate during growth of strains NZ131 and OK171. The growth of NZ131 and OK171 in THY broth culture was monitored by OD₆₀₀. At each time point, the concentration of lactate released into the culture medium was determined. In contrast to NZ131, strain OK171 delayed its production of lactate, and maximum levels did not appear until after nearly 2 days of incubation. The lines indicate the growth of the cultures as measured by OD₆₀₀, and the filled areas indicate the associated production of lactate during this growth. Data (OD₆₀₀, lactate production) are the average and standard error of two independent experiments for each strain; error bars are too small to be displayed.