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Why do Hexane extracted lipids from diatoms look yellow-brown (like a light beer)?
Answer 1:

Those are the pigments that diatoms use for photosynthesis. They are yellow-brown because the sealgae use yellow-brown pigments to capture sunlight,unlike land plants, who primarily use green pigments.It is a good question why diatoms use brown pigments and land plants green; it may be that green is more efficient on land and less so deeper in the water, but this is speculation as far as I know.



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