RT Journal Article SR Electronic(1) A1 AVERNER, M. A1 FULTON, C.YR 1966 T1 Carbon dioxide: Signal for Excystment of Naegleria gruberi JF Microbiology, VO 42 IS 2 SP 245 OP 255 DO https://doi.org/10.1099/13500872-42-2-245 PB Microbiology Society, SN 1465-2080, AB SUMMARY: Exposure of cysts of Naegleria gruberi to slightly increased environmental CO2 caused excystement. Excystment was also induced by addition of proline or by an increase in the cyst population density, but both did so by increasing the amount of CO2 produced by the bacteria (Aerobacter aerogenes) which contaminated the cyst suspensions. Molecular CO2 would seem to be an excellent signal to induce excystment of a phagotrophic soil amoeba since the presence of CO2 would indicate an environment favourable for growth of the amoebae. Once excystment is initiated, it can proceed to completion in atmospheric CO2., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/13500872-42-2-245