purple sulphur bacteria
(Science: microbiology) A group of phototrophic prokaryotes containing bacteriochlorophylls a or b and characterised by the ability to oxidize hydrogen sulphide (H2S) and store elemental sulphur inside the cells.
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... like if that hypothesis was true, then nothing would have black pigments - or pigments that absorb particularly energetic frequencies, such as the purples or ultraviolet. As it is, chlorophyll absorbs a pretty wide range of frequencies, at a heavy peak of intensity.
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