a group of Gram-negative pink to purplish-brown bacteria, comprising the purple sulfur bacteria and purple nonsulfur bacteria, that occur in anaerobic aquatic environments and carry out a unique form of photosynthesis without oxygen, using the pigment bacteriochlorophyll.
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How to use purple bacteria in a sentence
There are also other bacteria (sulphur-bacteria, purple-bacteria, etc.) that show various peculiarities of metabolism.The Wonders of Life | Ernst Haeckel
The purple bacteria have thus two sources of energy, one by the oxidation of sulphur and another by the absorption of "dark rays."