carbon from carbon dioxide to glucose with ..
Dark Reactions | Photosynthesis | Carbon Dioxide
But before the first photosynthesizing organisms appeared about 2.4 billion years ago, the atmosphere likely contained mostly carbon dioxide, as is the case today on Mars and Venus.Over the past 40 years, researchers have thought that there must have been a small amount of oxygen in the early atmosphere.Where did this abiotic ("non-life") oxygen come from?
carbon dioxide and water are used in ..
Formation dynamics of carbonic acid as function of base concentration: 0.25 M (red), 0.5 M (green) and 0.8 M (blue). At the highest base concentration the early time dynamics is dominated by encounter pair reactions, at longer pulse delay the dynamics is governed by diffusional motions of photoacid and base. The experimentally found reaction rate for the protonation of bicarbonate (red dot) is only consistent with previously obtained protonation rates of carboxylate bases CH3-xClxCOO- (blue triangles) and HCOO-(black square) when the real acidity for carbonic acid is used: pKa = 3.45 ± 0.15. In contrast the effective value for CO2/H2O cannot be used for the results obtained with the ultrafast protonation experiment.