| histamine shock | The shock state produced in animals by the injection of histamine; characterised by bronchiolar spasm in the guinea pig and constriction of hepatic veins in the dog. (05 Mar 2000) |
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| histamine test | A test for maximal production of gastric acidity or anacidity; after preliminary administration of an antihistamine, histamine acid phosphate is injected subcutaneously in a dose of 0.04 mg/kg of body weight, followed by analysis of gastric contents. Synonym: augmented histamine test. (05 Mar 2000) |
| histamine-fast | Indicating the absence of the normal response to histamine, especially in speaking of true gastric anacidity. (05 Mar 2000) |
| histaminic cephalalgia | <symptom> A term used to describe a headache that is typified by constant, unilateral pain around the eye, with onset usually within 2-3 hours of falling asleep. Can be accompanied by a blocked nasal passage, runny nose, and-or tearing. One may also notice facial flushing, ptosis (dropping eyelid), facial swelling and constriction of the pupils. (27 Sep 1997) |
| histaminic headache | <symptom> A term used to describe a headache that is typified by constant, unilateral pain around the eye, with onset usually within 2-3 hours of falling asleep. Can be accompanied by a blocked nasal passage, runny nose, and-or tearing. One may also notice facial flushing, ptosis (dropping eyelid), facial swelling and constriction of the pupils. (27 Sep 1997) |
| histaminuria | The excretion of histamine in the urine. Origin: histidine + G. Ouron, urine (05 Mar 2000) |
| histangic | Relating to the structure of blood vessels, especially in terms of their function. Synonym: histangic. Origin: histo-+ G. Angeion, vessel (05 Mar 2000) |
| histic epipedon | An 8- to 16-inch soil layer at or near the surface that is saturated for 30 consecutive days or more during the growing season in most years and contains a minimum of 20 percent organic matter when no clay is present or a minimum of 30 percent organic matter when 60 percent or more clay is present, generally a thin horizon of peat or muck if the soil has not been plowed. (09 Oct 1997) |
| histidase | <enzyme> An enzyme of the lyase class that catalyses the reaction of l-histidine to form urocanate and ammonia. The reaction is the initial step of histidine catabolism. Genetic deficiency of the enzyme, transmitted as an autosomal recessive trait, causes histidinaemia. Chemical name: L-Histidine ammonia-lyase Registry number: EC 4.3.1.3 (12 Dec 1998) |
| histidinaemia | <biochemistry> A medical condition in which the amount of the amino acid histidine in the blood is abnormally high.Also, histidine is present in the urine and the amount of the enzyme histidase (which breaks down histidine) is abnormally low. Mild retardation and speech or reading disorders often occur along with histidinaemia. (11 Jan 1998) |
| histidinal | The aldehyde analogue of histidine (-CHO replacing -COOH). (05 Mar 2000) |
| histidinase | <enzyme> An enzyme of the lyase class that catalyses the reaction of l-histidine to form urocanate and ammonia. The reaction is the initial step of histidine catabolism. Genetic deficiency of the enzyme, transmitted as an autosomal recessive trait, causes histidinaemia. Chemical name: L-Histidine ammonia-lyase Registry number: EC 4.3.1.3 (12 Dec 1998) |
| histidine | <amino acid> An amino acid with an imidazole side chain with a pKa of 6-7. Acts as a proton donor or acceptor and has high potential reactivity and diversity of chemical function. Forms part of the catalytic site of many enzymes. (18 Nov 1997) |
| histidine ammonia-lyase | <enzyme> An enzyme of the lyase class that catalyses the reaction of l-histidine to form urocanate and ammonia. The reaction is the initial step of histidine catabolism. Genetic deficiency of the enzyme, transmitted as an autosomal recessive trait, causes histidinaemia. Chemical name: L-Histidine ammonia-lyase Registry number: EC 4.3.1.3 (12 Dec 1998) |
| histidine deaminase | <enzyme> An enzyme of the lyase class that catalyses the reaction of l-histidine to form urocanate and ammonia. The reaction is the initial step of histidine catabolism. Genetic deficiency of the enzyme, transmitted as an autosomal recessive trait, causes histidinaemia. Chemical name: L-Histidine ammonia-lyase Registry number: EC 4.3.1.3 (12 Dec 1998) |
Synonyms : H1 Antihistamines, Non-Sedating, Second Generation Antihistamines, Second Generation H1 Antagonists, Antihistamines, Second Generation, H1 Antihistamines, Non Sedating, Histamine H1 Antagonists, Non Sedating, Non-Sedating H1 Antihistamines
Synonyms : Antagonists, Histamine H2, Blockaders, Histamine H2 Receptor, H2 Receptor Blockaders, Histamine H2 Blockers, Receptor Antagonists, Histamine H2, Receptor Blockaders, H2, Blockaders, H2 Receptor, Blockers, Histamine H2, H2 Antagonists, Histamine
Synonyms : Histamine N Methyltransferase, Methyltransferase, Histamine, N-Methyltransferase, Histamine
Synonyms : Histamine Liberations, Histamine Releases
Synonyms : Histidine, L-isomer, L-Histidine, Histidine, L isomer, L-isomer Histidine
| histiocytosis |
a blood disease characterized by an abnormal multiplication of macrophages
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| histocompatibility |
condition in which the cells of one tissue can survive in the presence of cells of another tissue; "a successful graft or transplant requires a high degree of histocompatibility"
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| histogram |
a bar chart representing a frequency distribution; heights of the bars represent observed frequencies
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| histologist |
anatomist who specializes in the microscopic study of animal tissues
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| histology |
the branch of biology that studies the microscopic structure of animal or plant tissues
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| HIST | of or relating to histology |
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| HIST | of or relating to histology |
| HIST | involving the use of histology or histological techniques |
| HIST | anatomist who specializes in the microscopic study of animal tissues |
| HIST | the branch of biology that studies the microscopic structure of animal or plant tissues |
| HIST | a simple protein containing mainly basic amino acids |
| HIST | a person who is an authority on history and who studies it and writes about it |
| HIST | important in history |
| HIST | belonging to the past |
| HIST | of what is important or famous in the past |
| HIST | an era of history having some distinctive feature |
| HIST | a stage in the history of a culture having a definable place in space and time |