0987 Stationary phase 5 Exponentlal growth phase Death phase Some cells remain viable Lag phase 10 15 20 25 30 35 40 Hours Total cells in population,live and dead,at each phase □-Few or no cells ☐-Live cells☐-Dead cells Figure 7.17 The growth curve in a bacterial culture.On this graph,the number of viable cells expressed as a logarithm (log)is plotted against time.See text for discussion of the various phases.Note that with a generation time of 30 minutes,the population has risen from 10(10)cells to 1,000.000,000(10)cells in only 16 hours.Cells are multiplying and dying all along the curve.but the relative rates of these events change as the curve proceeds. 迟缓期(Lag phase): 将少量菌种接入新鲜培养基后，在开始 一段时间内菌数不立即 增加，或增加很少，生长速度接近于零。也称延迟期、适应期迟缓期(Lag phase)： 将少量菌种接入新鲜培养基后，在开始一段时间内菌数不立即 增加，或增加很少，生长速度接近于零。也称延迟期、适应期