Abstract
IT is generally accepted that about four energy quanta of red light (λ = 660 µµ) are needed to promote the assimilation of one molecule of carbon dioxide. This conclusion is based in the main on the measurements of Warburg and Negelein1, who determined the ratio W/E, that is, the volume of carbon dioxide assimilated by Chlorella during the absorption of one calorie of light energy. They designated this ratio by Φ and, since it is well known that Φ increases with decrease in light intensity, the value Φ0 found with the minimum intensity was adopted.
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References
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BALY, E. Quantum Efficiency of Photosynthesis. Nature 149, 218–219 (1942). https://doi.org/10.1038/149218b0
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DOI: https://doi.org/10.1038/149218b0
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