Published online by Cambridge University Press: 31 October 2008
In many cases, when a colony of micro-organisms such as moulds, yeasts or bacteria grows on the plane surface of a solid medium (e.g. agar), starting from a single cell, the colony tends to grow as an ever expanding circle. The reason for this is that every cell, if free from competition, can multiply at roughly a constant rate in all directions in a plane, limited by the fact that territory occupied by one cell cannot be occupied by another. For the purposes of the present discussion, we can assume, as a first approximation, that the whole process is two-dimensional.
page 14 note 2 Shinn, L. E., Journal of Bacteriology, 38 (1939), pp. 5–12Google Scholar. “Factors governing the development of variational structures within bacterial colonies.”
page 16 note 1 Basset, A. B., Elementary Treatise on Cubic and Quartic Curves, Cambridge, 1901, p. 172.Google Scholar
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