Where does the oxygen come from ? Photosynthesis is a redox reaction H20 + CO2 CH20 + O2 Van Niel (1920s) analyzed the photosynthesis of purple bacter
{"Image DocumentName": "Photosynthesis is a redox reaction", "Image ImageDescription": "Where does the oxygen come from ? H20 + CO2. CH20 + O2. Van Niel (1920s) analyzed the photosynthesis of purple bacteria: nCO2 + 2 nH2O + light \uf0e0 (CH2O)n + nO2 + nH2O. nCO2 + 2nH2S + light \uf0e0 (CH2O)n + 2nS + nH2O. Hill equation (1937): H20 + A + light \uf0e0 \u00bd O2 + H2A. Van Niel (1920s) inferred correctly that CO2 was not the source of the evolved O2, or alternatively said, the initial oxidation-reduction reactions did not involve CO2. In other words, the conversion of light energy to biosynthesis using CO is not obligatory. Hill equation: Robert Hill in 1937 detected that isolated chloroplasts give off oxygen in the presence. of unnatural reducing agents like iron oxalate, ferricyanide or benzoquinone after exposure to light. The reaction went down in literature as the HILL-reaction. (Ziong et al., 2000, Science) Purple bacteria are the earliest emerging photosynthetic lineage OXYGENIC / ANOXYGENIC photosynthesis. LIGHT/ DARK or CARBON-LINKED reactions.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}