| carbonic acid | <chemical> Carbonic acid (h2c03). The hypothetical acid of carbon dioxide and water. It exists only in the form of its salts (carbonates), acid salts (hydrogen carbonates), amines (carbamic acid), and acid chlorides (carbonyl chloride). Chemical name: Carbonic acid (12 Dec 1998) |
|---|---|
| carbonic acid gas | <biochemistry, physiology> A metabolic byproduct of carbohydrate metabolism. Carbon Dioxide collects in the tissues, is cleared by the blood (via the veins) and removed from the body via the lungs when we exhale air. Abbreviation: CO2 (13 Nov 1997) |
| carbonic acid inhibitor | <pharmacology> A group of diuretic medications which act to inhibit the enzyme carbonic anhydrase to create a metabolic acidosis. Many of these medications are used in the treatment of glaucoma. (27 Sep 1997) |
| carboxylic acid | An organic acid containing the functional group -COOH.Structurally, the group looks like: O=C- | OH (09 Oct 1997) |
| carboxylic acid ester | Specifically, an ester derived from a carboxylic acid and an alcohol; R-CO-R' (05 Mar 2000) |
| carboxylic acid reductase | <enzyme> Reduces double bonds in presence of hydrogen Registry number: EC 1.3.99.- (26 Jun 1999) |
| carminic acid | A glucoside of an anthracenequinone carboxylic acid; the essential constituent of carmine. (05 Mar 2000) |
| vaccenic acid | CH3(CH2)5CH==CH(CH2)9COOH; n-trans-11-octadecenoic acid;an unsaturated fatty acid of which both cis and trans isomers are found in butter and other animal fats. (05 Mar 2000) |
| G acid | 2-Naphthol-6,8-disulfonic acid. (05 Mar 2000) |
| gadoleic acid | An unsaturated fatty acid from cod liver oil and other sources. Synonym: 9-eicosenoic acid. (05 Mar 2000) |
| gallic acid | <chemical> Chemical name: Benzoic acid, 3,4,5-trihydroxy- (12 Dec 1998) |
| valeric acid | CH3(CH2)3COOH;normal aliphatic acid; distilled from valerian; some of its salts are used in medicine; found in human colon. Synonym: pentanoic acid. (05 Mar 2000) |
| valproic acid | This drug is used to treat seizures. It may cause liver damage and has side effects such as drowsiness, nausea, and hair loss. (09 Oct 1997) |
| gamma aminobutyric acid | <biochemistry> An important amino acid which functions as the most prevalent inhibitory neurotransmitter in the central nervous system. Gamma aminobutyric acid works in partnership with a derivative of Vitamin B-6, pyridoxine, to cross from the axons to the dendrites through the synaptic cleft, in response to an electrical signal in the neuron and inhibits message transmission. This helps control the nerve cells from firing too fast, which would overload the system. The action of gamma aminobutyric acid decreases epileptic seizures and muscle spasms by inhibiting electrical signals in this manner. Studies have shown that the site of action in the brain of benzodiazepams, including Valium, is directly coupled to the brain receptor for gamma aminobutyric acid. Acronym: GABA (05 Jan 1998) |
| gamma aminobutyric acid receptor | <physiology> Ligand gated chloride ion channel forming receptor opened by gamma aminobutyric acid. Two distinct types: A and B. A receptor: One of a family of neurotransmitter receptors with fast intrinsic ion channels that includes the glycine receptor and the nicotinic acetylcholine receptor. Distinct from another major receptor family, the muscarininc acetylcholine receptor and rhodopsin, with no intrinsic ion channel. The A receptor is specifically blocked by bicuculline. It consists of two pairs of protein chains forming an A2B2 complex, the A chains bind benzodiazepine and the B chains bind GABA. The 4 subunits are thought to form a tight group with the chloride channel in the middle. There is considerable similarity between the amino acid sequences of the receptor subunits and those of the nicotinic acetylcholine receptor suggesting that both receptors are derived from some evolutionary ancestor. See: amino acid receptor superfamily. B receptor: Brain receptor (80 kD) for the inhibitory neurotransmitter gamma amino butyric acid. Differs from the A receptor both in agonist specificity (baclofen is a specific agonist) and its effects on cells. It modulates intracellular calcium levels through a Go mediated effect on N type calcium channels and also lowers intracellular cAMP levels by an effect on adenylyl cyclase, thereby reducing the secretion of catecholamines. (05 Jan 1998) |