Category: H
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Histidine ammonia-lyase
A liver enzyme that catalyzes L-histidine with the resultant formation of urocanic acid and ammonia. Deficiency of this enzyme causes histidinemia.
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Histenzyme
A renal enzyme that splits up hippuric acid into benzoic acid and glycine.
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Hirudo
A genus of leeches belonging to the family Gnathobdellidae.
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Hirudinea
A class of Annelida. This group is hermaphroditic, lacks setae or appendages, usually has two suckers, and includes the bloodsucking leeches.
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Hirudicide
Any substance that destroys leeches.
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Hirschberg’s reflex
Adduction of the foot when the sole at the base of the great toe is irritated.
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Hircismus
A malodorous condition of the axillae caused by bacterial action on the sweat.
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Hippuricase
An enzyme found in the liver, kidney, and other tissues that catalyzes the synthesis of hippuric acid from benzoic acid and glycine.
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Hippuric acid
An acid formed and excreted by the kidneys. It is formed in the human body from the combination of benzoic acid and glycine, the synthesis taking place in the liver and, to a limited extent, in the kidneys.
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Hippuria
Large quantities of hippuric acid in the urine.