PERIODIC SELECTION IN ESCHERICHIA-COLI
PERIODIC SELECTION IN ESCHERICHIA-COLI
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DOI：
10.1073/pnas.37.3.146
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发表时间：
1951-01-01
影响因子：
11.1
通讯作者：
RYAN, FJ
中科院分区：
文献类型：
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作者：
ATWOOD, KC;SCHNEIDER, LK;RYAN, FJ
结果。-在从仅含h-的接种物开始的ST中，h+增加，直到约15至20次转移（100至140代）后，获得约1 h+/106 h-的平衡比率，如图1（A）所示。当ST以各种初始h+/h-比率开始时，范围从小于1 h+/106 h-至约100 h+/106 h-，最终达到平衡，如图2所示。平衡以上的h+/h比率的一个奇怪的特征是在实验开始和下降之间总是存在大约30次转移的平台区。
Results.-In STs started from inocula containing only h-, the h+ increased until after about 15 to 20 transfers (100 to 140 generations) an equilibrium ratio of about 1 h+ per 106 h-was obtained as shown in figure 1 (A). When STs were started with various initial h+/h-ratios ranging from less than 1 h+ to about 100 h+ per 106 h-, the equilibrium was reached eventually, as shown in figure 2. A curious feature of h+/hratios above equilibrium is the plateau region of some 30 transfers which always intervenes between the start of the experiments and the fall to