Cornelis van Niel (Nov 4 1897, Haarlem - March 10 1985, Carmel, California) was a Dutch microbiologist who studied photosynthetic bacteria. In the 1930s he introduced the concept that oxygen production is not directly associated with the fixation of carbon dioxide. Aside from the cyanobacteria, bacteria only have one photosystem and use reducing agents other than water. They get electrons from a variety of different inorganic chemicals including sulfide or hydrogen, … Wikipedia
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