phenotype

n. the observable characteristics of an individual, such as morphological or biochemical features and the presence or absence of a particular disease or condition. Phenotype is determined by the expression of the individual’s genotype coupled with the effects of environmental factors (e.g., nutritional status, climate). See also paratype. —phenotypic adj.

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Psychology term of the day

December 18th 2024

isoniazid

n. a drug of choice for the treatment of tuberculosis. Use of the drug can cause a form of neuritis by blocking the function of pyridoxine (vitamin B₆) in metabolizing glutamic acid to form the neurotransmitter gamma-aminobutyric acid. Isoniazid is structurally related to a known monoamine oxidase inhibitor (MAOI), iproniazid, and was reputed to have some antidepressant activity, although it is not clinically used in this role and is not an MAOI. Also called isonicotinic acid hydrazide (INH).