U4o,7U刀 6.0 1.000.000 (Log10=6.02) 5.0 (L0g10=4.50) 6 Logio of 4.0 Arithmetic Arithmeti (524,.288) Generation Number Number (L0g10=3.01) Number of Cells of Cells 3.0 500.000 0 1 0 5(2= 32 1.51 (L0g10=1.51), 10(219= 1,024 3.01 6 2.0 (262,144) 15(215)= 32,768 4.52 16(216)= 65,536 482 17217)= 131,072 5.12 1.0 (131.072) 18(21= 262,144 5.42 (65.536) 100.000 19(219= 524,288 5.72 (32) (1024) (32.768) 20(220= 1.048.576 6.02 0 0.000 0 5 10 15 20 Generations Figure 6.13 A growth curve for an exponentially increasing population,plotted logarithmically(dashed line) and arithmetically (solid line). If the arithmetic line were plotted for two more generations. would it still be on the page?
生长曲线(Growth Curve 10 Stationary phase 987 th phase Death phas Expone Some cells remain viable Lag phase 0 0 25 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
细菌接种到均匀的液体培养基后,定时 取样测定细胞数量,以培养时间为横座标， 以细菌数目的对数为纵座标作图,得到的 一条反映细菌在整个培养期间菌数变化 规律的曲线。 生长曲线(Growth Curve)
Stationary phase 98 Exponential growth phase Death pha Some cells remain viable Lag phase 15 Hours Total cells in population,live and dead,at each phase -Few or ho cells ☐-Live cells ☐-Dead cells 迟缓期(Lag phase) er of viable cells expressed as a logarithm (log)is plotted against a generation time of 30 minutes,the population has risen from re multiplving and dying all along the curve,but the relative 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。也称迟缓期/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。也称迟缓期/适应期