Abstract
Batch cultures of Bacillus megaterium grown in phosphate-limited media were compared with control cultures grown in phosphate-sufficient media. The effects of phosphate limitation on growth were determined by viable cells counts. Intracellular levels of protein, RNA, poly-3-hydroxybutyrate, carbohydrate and oxygen uptake were significantly affected by phosphate limitation. Electron micrographs of sectioned cells revealed differences in the structure; in particular the thick, rigid cell wall was absent from cells grown in phosphate-limited media, and such cells were larger, pleomorphic, and after 2 d were insensitive to lysozyme.
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