| homocitrate synthase | <enzyme> Chemical name: 3-hydroxybutane-1,2,4-tricarboxylate 2-oxoglutarate-lyase (CoA-acetylating) Registry number: EC 4.1.3.21 Synonym: lys1 gene product, nifv gene product (26 Jun 1999) |
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| homocitrullinuria | An inherited disorder associated with elevated urinary levels of homocitrulline. (05 Mar 2000) |
| homocladic | Denoting an anastomosis between branches of the same arterial trunk, as distinguished from heterocladic. Origin: homo-+ G. Klados, a branch (05 Mar 2000) |
| homocyclic compound | Any compound in which the constituent atoms, or any part of them, form a ring. Used mainly in organic chemistry where: 1) numerous compound's contain rings of carbon atoms (carbocyclic compound's) or carbon atoms plus one or more atoms of other types (heterocyclic compound's), usually nitrogen, oxygen, or sulfur; 2) where the atoms in the ring are all of the same element (homocyclic or isocyclic compound); 3) where the ring is saturated or contains nonconjugated double bonds (alicyclic compound), the compound is similar in properties to the corresponding acyclic compound (e.g., cyclohexane resembles hexane); 4) where the ring contains conjugated double bonds in a closed loop in which there are 4n + 2 (where n is an integer) delocalised π electrons (Huckel's rule) (aromatic compound; e.g., benzene, pyridine), it is more stable than the corresponding saturated ring and exhibits unusual chemical properties characteristic of itself and not of other types of rings or of acyclic compound's. These aromatic compounds have the ability to sustain an induced ring current. Synonym: closed chain compound, ring compound. (05 Mar 2000) |
| homocysteine | <chemical> Chemical name: Homocysteine (12 Dec 1998) |
| homocysteine cystathionine gamma-synthase | <enzyme> Homocysteine and cystein yield cystathionine and h2s Registry number: EC 4.4.- Synonym: hccg-s (26 Jun 1999) |
| homocysteine desulfhydrase | <enzyme> Catalyses the breakdown of homocysteine to hydrogen sulfide, ammonia and 2-oxobutanoate Registry number: EC 4.4.1.2 Synonym: homocysteine desulfurase, homocysteine desulphurase (26 Jun 1999) |
| homocystinaemia | Presence of an excess of homocystine in the plasma, as in homocystinuria. (05 Mar 2000) |
| homocystine | <chemical> Chemical name: Butanoic acid, 4,4'-dithiobis(2-amino- (12 Dec 1998) |
| homocystinuria | <biochemistry> Recessive condition in which the enzyme (cystathione synthetase) that converts homocysteine and serine into cystathione, a precursor of cysteine, is missing. Deficiency of this enzyme has widespread consequences in connective tissue, circulation and nervous system. Inheritance: autosomal recessive. Origin: Gr. Ouron = urine (11 Nov 1997) |
| homocytotropic | Having an affinity for cells of the same or a closely related species. Origin: homo-+ G. Kytos, cell, + trope, a turning toward (05 Mar 2000) |
| homocytotropic antibody | <immunology> A type of antibody which is able to attach itself to the surfaces of cells without needing specific combining sites. A homocytotropic antibody will only bind to cells which are from the same species as itself. (09 Oct 1997) |
| homodemic | <biology> A morphological term signifying development, in the case of multicellular organisms, from the same unit deme or unit of the inferior orders of individuality. Origin: Homo- + 1st deme, 2. Source: Websters Dictionary (01 Mar 1998) |
| homodermic | <biology> Relating to homodermy; originating from the same germ layer. Source: Websters Dictionary (01 Mar 1998) |
| homodermy | <biology> Homology of the germinal layers. Origin: Homo- + -derm. Source: Websters Dictionary (01 Mar 1998) |