BSC 310 Lecture 29: 5.1-5.2 Binary Fission and Quantitative Aspects of Microbial Growth
22 Feb 2019
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Document Summary
Growth = an increase in the # of cells (not an ideal de nition!) In bacteria , growth depends upon a large number of cellular rxns, both bioenergetic and biosynthetic. Binary ssion = the process of elongation in a rod shaped cell until the cell divides into 2 cells. Usually grow to ~2x the original length. Generation = the formation of 2 cells from 1. Generation time = the time required for a microbial cell to divide into 2 cells. Each daughter cell receives a chromosome, ribosomes, and all other macromolecules to exist as an independent cell. Time for a generation varies dramatically b/t species. Often dependent upon nutritional, genetic, and environmental (e. g. temp) factors. Under ideal conditions, e. coli replicates every ~20 min. Most bacterial division occurs by binary ssion, but some undergo other processes: Budding division = mother cell forms a daughter cell while retaining its original identity; does this by growth at a single point.
