Vg. Remennikov et al., EFFECT OF CULTIVATION CONDITIONS ON THE GROWTH, POLYAMINE CONTENT, AND ULTRASTRUCTURE OF ECTOTHIORHODOSPIRA-HALOPHILA, Microbiology, 64(5), 1995, pp. 496-500
It was found that the optimum temperature of Ectothiorhodospira haloph
ila growth depends on the concentration of sodium chloride in the grow
th medium and is about 37 and 32 degrees C for 20% and 10% NaCl, respe
ctively. A decrease in the NaCl concentration from 20 to 10% (growth t
emperature of 37 degrees C) or an increase in the growth temperature f
rom 37 to 48 degrees C (NaCl concentration of 20%) decelerates growth
and modifies the morphology and ultrastructure of E. halophila cells:
instead of spirilla with distinct nucleoids, more or less swollen sphe
roidal cells with no visible nucleoids appear. These changes are accom
panied by an increase in the cellular content of the polyamines putres
cine, cadaverine, spermidine, and spermine. Their physiological role i
s discussed.