In a batch culture, which phase has zero net growth?
In batch culture population dynamics defined by net rate birth minus death. Lag phase net near zero during adaptation, log phase net strongly positive with mu dominant, stationary net zero because division still occurs using scavenged nutrients from lysed cells cryptic growth at rate equal to death rate from oxidative damage, acid stress, toxin accumulation. Viable counts plateau because new cells forming balance those losing colony forming ability. Microscopically heterogeneity high some cells dividing, some filamentous, some entering persistence via toxin antitoxin HipA. Optical density may
Ref: Brock Biology of Microorganisms, 16th ed., Chapter 6: Batch culture - Zero net growth in stationary.