RT Journal Article SR Electronic(1) A1 Callow, D. S. A1 Pirt, S. J.YR 1956 T1 Automatic Control of pH Value in Cultures of Micro-organisms JF Microbiology, VO 14 IS 3 SP 661 OP 671 DO https://doi.org/10.1099/00221287-14-3-661 PB Microbiology Society, SN 1465-2080, AB SUMMARY: Equipment for the automatic control of pH value in cultures of micro-organisms is described. The apparatus was designed for a 2 l. scale continuous culture apparatus. The equipment will continuously control pH value with an accuracy of ± 0·05 unit for periods of many hundred hours. The pH value may be changed at will by turning a knob on the controller. It is sufficient to check the pH meter standardization once every day or two. The main components of the apparatus are standard commercial products., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-14-3-661