purple sulfur bacterium

noun

Definition of purple sulfur bacterium

: any of numerous sulfur bacteria (as of the family Thiorhodaceae) appearing reddish or purplish due to the combination of bacteriochlorophyll and carotenoid pigments in the cell

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“Purple sulfur bacterium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/purple%20sulfur%20bacterium. Accessed 26 Jan. 2022.

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