Cell culture assay, active oxygen

FIGURE 1. Induction of nitrogenase activity in Phormidium foveolarum at low light intensity (1 W/m ). Cell density was 40 ul packed cell volume/ ml culture suspension chlorophyll 73 hg/ml. (A-A) hydrogen, (A-4) ethylene, (o—O)carbon dioxide, and ( r— ) oxygen content in the assay vessels, as referred to ml cell suspension. Ethylene was not measurable throughout the assay time due to limited acetylene concentrations (10% v/v) present at start. 

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