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A new study published by Edwards et al. (2015) in the journal Proceedings of the National Academy of Sciences shows a potentially important role for polyunsaturated aldehydes (PUAs), which are commonly released by stressed and/or dying diatoms, in stimulating bacterial degradation of phytoplankton-derived sinking organic carbon and converting it back to CO2, thus reducing carbon export efficiency. Read the full article（http://www.pnas.org/content/early/2015/04/22/1422664112.full.pdf）.