Bacterial
cells in carbon-rich media grow twice as big as those in carbon-poor media. New
research shows they can grow big, however, only if they can make fats with the
carbon. The membrane that defines the boundary between the inside and outside
of the cell is made almost entirely of fat. So it's not really surprising that
fat synthesis would limit cell size.
Scientists
grew the bacteria Salmonella typhimurium in more than 20 different media with
varying nutrient compositions. In the nutrient-poor media, the cells grew
slowly and were small; in the nutrient-rich media, they grew faster and were
larger.
What’s
the reason? See:
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