Embryology (1949) Embryology embryology00bart Year: 1949 AGE Or CULTURE ACE OF SUBCULTURE AGE OF CULTURE Fig. 162. Growth curves of microorganisms in a limited volume of culture medium. Note that the logarithm of the total number of cells at any one time has been plotted against the age of the culture. In this sort of plot a straight line means that each microorganism is growing and dividing at a constant rate. Another way of expressing this phase of growth is to say that the number of cells doubles at regular time intervals. Upper left: A few microorganisms are put into a fresh culture fl
Embryology (1949) Embryology embryology00bart Year: 1949 AGE Or CULTURE ACE OF SUBCULTURE AGE OF CULTURE Fig. 162. Growth curves of microorganisms in a limited volume of culture medium. Note that the logarithm of the total number of cells at any one time has been plotted against the age of the culture. In this sort of plot a straight line means that each microorganism is growing and dividing at a constant rate. Another way of expressing this phase of growth is to say that the number of cells doubles at regular time intervals. Upper left: A few microorganisms are put into a fresh culture flask. They may show a short latent period but soon a plot of the logarithm of the cell number against time gives a straight line. After this period of constant growth (logarithmic growth) the cell divisions fall off rapidly and a steady state is attained where the number of individuals in the culture does not increase. Upper right: Some of the animals from the culture in the stationary state are placed in a fresh culture medium (subculture). These animals do not begin to divide immediately but show a short latent period. They then exhibit the same kind of growth as was originally obtained. Bottom: The logarithmic phase of growth can be extended by increasing the concentration of the food in the medium, Cx, C2, C3, and C4. There is a limit, however, to the effect of increased concentration of food.
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