The culture conditions and cell composition of a hydrogen bacterica, Alcaligenes eutrophus ATCC 17697. were investigated. Optimum pH and temperature for cell growth under autotrophic condition (H©ü as energy source, CO©ü, as crabon source) were around 7.0 and 30¡É. respectively. Effect of oxygen partial pressure in the range of 0.059 atm and 0.27 atm on cell growth was also studied. Maximum specific growth rate (¥ì_(max)=0.31hr^(-1)) was observed at 0.11 atm of oxygen partial pressure (H©ü:O©ü:CO©ü=7:1:1). The contents of crude protein, nucleic acid and ash in cells were 69.2%, 17.6%, and 3.62%, respectively.
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