“…The development of aberrant branches resulting in "Y"shaped configurations is shown in figure 7. Similar cells have been shown by Zapf (1953), Bergersen (1953), Stempen andHutchinson (1951), Duguid (1948), Mellon (1925), and Gardner (1925) in other bacteria under other conditions. Fusiform cells and "large bodies" were also observed.…”
Colchiciiie, a highly toxic plant alkaloid, is used by geneticists for the production of polyploidy in plants. While mitosis and cell division are suppressed, the multiplication of the chromosomes may not be interrupted.
“…The development of aberrant branches resulting in "Y"shaped configurations is shown in figure 7. Similar cells have been shown by Zapf (1953), Bergersen (1953), Stempen andHutchinson (1951), Duguid (1948), Mellon (1925), and Gardner (1925) in other bacteria under other conditions. Fusiform cells and "large bodies" were also observed.…”
Colchiciiie, a highly toxic plant alkaloid, is used by geneticists for the production of polyploidy in plants. While mitosis and cell division are suppressed, the multiplication of the chromosomes may not be interrupted.
“…Stained preparations can be misleading: for example, stages resembling those of figure 1 have been described as zygospores or fusion figures by Mellon (1925) and Klieneberger-Nobel (1950). Direct continuous observations on living material (Stahelin, 1954;Stempen and Hutchinson, 1951) leave no doubt that fusion can occur, but is it de novo or refusion? Published photographs generally show adjacent protoplasts that may have coalesced again before the completion of an earlier fission or budding.…”
Section: General Discussion and Recapitulationmentioning
A preceding article (Lederberg, 1956a) was devoted to the evolution of protoplasts from growing cells of Escherichia coli treated with penicillin. Further studies have strengthened the correspondence of these protoplasts with the
“…DeLamater and Hunter (1953) associated their formation in B. megaterium with nutritional factors in blood. As with the genus Proteus (Stempen and Hutchinson, 1951), our experience would suggest these cells arise primarily by swelling of normal cells. However, the tendency of bacilli to pair leaves some suggestion of fusion, particularly when associated with the viable count drop.…”
Section: Discussionmentioning
confidence: 84%
“…Large cells of Escherichia coli are associated with a diploid phase in that species (Lederberg, 1956). Large bodies were reported in cultures of Proteus vulgaris by Stempen and Hutchinson (1951) and shown to arise both from swelling of individual bacilli and fusion of cells. Similar large bodies were reported in luminous bacteria (Johnson and Gray, 1949;Warbasse and Johnson, 1950) and associated with physiological conditions of stress.…”
Large cell stage in the genus Bacillus. J. Bacteriol. 82:418-424. 1961.-Synchronous cultures of Bacillus polymyxa and Bacillus cereus produced a transitory large cell stage with increased nuclear material concomitant with a drop in viable count during growth in a defined medium. A variant of B. cereus that required no organic nitrogen for growth and sporulation was inhibited by serine and this inhibition reversed by equimolar amounts of threonine. Serine inhibition occurred before the large cell stage but not after. The significance of this large cell stage as regards transformation studies, nucleic acid analysis, and sporulation was considered.
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