Growth is the expression par excellence of the dynamic nature of livin
g organisms. Among the general methods available for the scientific in
vestigation of dynamic phenomena, the most useful ones are those that
deal with kinetic aspects. Kinetic investigations on cultures of micro
-organisms are eminently suited for establishing relationships between
growth and environmental factors, especially the nature and amount of
nutrients. C. B. van Niel (1949) The study of the growth of bacterial
cultures does not constitute a specialised subject of branch of resea
rch: it is the basic method of Microbiology. Monod (1949)