RT Journal Article SR Electronic(1) A1 Jurado, Amlia S. A1 Santana, Augusto C. A1 Costa, Milton S. DA A1 Madeira, VR M. C.YR 1987 T1 Influence of Divalent Cations on the Growth and Morphology of Bacillus stearothermophilus JF Microbiology, VO 133 IS 3 SP 507 OP 513 DO https://doi.org/10.1099/00221287-133-3-507 PB Microbiology Society, SN 1465-2080, AB SUMMARY: Bacillus stearothermophilus grows within the temperature range 40–70 °C in a complex medium that contains 115 μm-Ca2+ and 95 μm-Mg2+. The addition of Ca2+ to a final concentration ranging from 2·5 to 10 mm stimulated growth at suboptimal and supraoptimal temperatures, extending growth above 70°C, but had no effect on growth within the optimal temperature range. Mg2+ (2·5 mm) also stimulated growth although to a lesser extent. Furthermore, 10 mm-Mg2+ inhibited growth at temperatures higher than 65°C. This inhibitory effect was relieved by the addition of 2·5 mm-Ca2+. Sr2+ (10 mm), which often behaves as a Ca2+ analogue in biological systems, strongly inhibited growth and produced gross morphological alterations in the cells. The inhibitory effect of Sr2+ could also be relieved by addition of Ca2+., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-133-3-507