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purple bacteria
plural noun
- 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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Word History and Origins
Origin of purple bacteria1
First recorded in 1895–1900
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Example Sentences
There are also other bacteria (sulphur-bacteria, purple-bacteria, etc.) that show various peculiarities of metabolism.
From Project Gutenberg
The purple bacteria have thus two sources of energy, one by the oxidation of sulphur and another by the absorption of "dark rays."
From Project Gutenberg
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