《环境工程微生物学》课程扩展资料（scientist microbiology from Harvard）Stochasticity in the Bacterial World

Cultures of exponential phase B. subtilis contain longchains of unseparated cells as well as motile cells

Cultures of exponential phase B. subtilis contain long chains of unseparated cells as well as motile cells

Chains with oD OFF and motile cells with D ON

Chains with σD OFF and motile cells with σD ON