SUMMARY: was cultured chemolithotrophically under aerobic and anaerobic conditions in a chemostat with thiosulphate, nitrate or nitrite as limiting nutrient. Estimations of growth yields and maintenance coefficients showed that grew more efficiently than other thiobacilli both aerobically and anaerobically. Relative growth yield data enabled the probable amounts of ATP generated during thiosulphate-limited aerobic growth and nitrate-limited anaerobic growth on thiosulphate to be calculated as, respectively, 6 to 7 and 4 to 5 mol ATP formed per mol thiosulphate oxidized. The energy available from tetrathionate oxidation was almost twice that from thiosulphate.


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