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- W2049583292 abstract "The object of this work was to develop a method for determination of the growth of Myxocuccus virescens in liquid medium. The bacteria were grown in N III-B medium in 100 ml Kjeldahl flasks, which were fixed on a disc forming an angle of 50 degrees with the horizontal plane. The disc was rotated two full revolutions per minute. The total nitrogen content of the washed swarms, developing on the glass walls of the flasks, was used as an expression for the myxobacterial growth. After a lag the bacteria grown in total darkness had a growth phase, approximately exponential, of about 270 hours, which was followed by a steep phase of decline. When the bacteria were illuminated daily for a short period, a lag of 50–200 hours appeared in the middle of the exponential growth phase, after which a new exponential growth phase began. This second growth seemed to depend on variants insensitive to light induced lysis. The increase of enzymes, active on casein and autoclaved aerobacter cells, closely followed the first part of the growth curve. However both activities began to decrease before the growth maximum. No sign of proteolytic activity or lytic activity on autoclaved aerobacter cells could be detected after about 700 hours' incubation. In illuminated flasks it is shown that the production of yellow pigments in culture solution is sharply increased at the end of the exponential growth phase. The lytic enzymes of M. virescens seem to be extracellular, secreted during the exponential phase of growth. No activity was exhibited by washed cell swarms, even if they were sonically disintegrated." @default.
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- W2049583292 date "1967-10-01" @default.
- W2049583292 modified "2023-09-24" @default.
- W2049583292 title "Growth and Enzyme Activity of Myxococcus virescens in Liquid Medium" @default.
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- W2049583292 doi "https://doi.org/10.1111/j.1399-3054.1967.tb08372.x" @default.
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