Abstract
Bacterial cell wall is the main structure to maintain a specific cell shape and to resist the osmotic pressure of several atmospheres. Despite many research, some basic questions remain unsolved: Out of many possibilities, why do bacteria only have several defined shapes? What is the relation between growth and morphology of a bacteria? How do rod-like bacteria select and maintain a specific radius, but grow in the axial direction? Is there any size limit for bacteria? What factors determine the size limit if it exists? In this paper, we set up a general growth model for bacterial cell wall and try to answer the previous questions. We found the growth modes and the size limits for coccus, bacillus, vibrio and spirillum, which are consistent with the experiments well.
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