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Dictionary » P » Purples

Purples

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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why is green photosynthesis so dominant?

... 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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by Darby
Thu May 17, 2007 7:47 pm
 
Forum: Evolution
Topic: why is green photosynthesis so dominant?
Replies: 14
Views: 2740


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