| purple sulfur b. |
a photosynthetic autotrophic anaerobic bacterium of the family Chromatiaceae. Purple sulfur bacteria reduce carbon dioxide and oxidize sulfides and elemental sulfur in the presence of the pigment bacteriochlorophyll a or b.
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| purpuric acid |
an imino-condensation product of alloxan, found in Weidel's test for uric acid. See also murexide, and Weidel's test (def. 1), under tests.
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| purpurine |
1. a neurotoxic substance derived from the median zone of the hypobranchial or purple gland of gastropods of the genus Purpura, thought to be an ester or a mixture of esters of choline; the substance is called murexine when derived from snails of the genus Murex. 2. purpurin (def. 1).
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| purpurinuria |
the presence of uroerythrin in the urine.
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| purpurogenous |
producing visual purple (rhodopsin).
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