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大肠杆菌微菌落照片
James Shapiro and Clara Hsu, Department of Biochemistry
and Molecular Biology, University of Chicago, Chicago, Ill., USA
Escherichia coli microcolonies were produced after 11.5 h of growth
at 37癈 on an agar slide. This mass of tightly packed individual cells
arises from a single cell through binary division.
The emergence of a second layer of cells can be seen in the central
region. The appearance of this layer (and of successive additional layers)
is a regular feature of early colony development, which shows that the
colony center remains an active zone of cell growth. With longer times
of incubation, additional layers form near the perimeters of older microcolonies
to generate a multilayered structure.