| GSA | general somatic afferent; group-specific antigen; Gross virus antigen; guanidinosuccinic acid |
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| AGPA | American Group Practice Association; American Group Psychotherapy Association |
| CCG | Children's Cancer Study Group; cholecystogram, cholecystography; clinically coherent group |
| DRG | diagnosis-related group; Division of Research Grants [NIH}; dorsal respiratory group; dorsal root ga... |
| GT | gait training; galactosyl transferase; gastrostomy; generation time; genetic therapy; gingiva treatm... |
| psychoses, substance-induced | Psychotic organic mental disorders resulting from the toxic effect of drugs and chemicals or other harmful substance. (12 Dec 1998) |
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| sensitizing substance | Antibody that combines with and sensitises antigen leading to the activation of complement, which may result in cell lysis. Synonym: CF antibody, sensitizing substance. (05 Mar 2000) |
| h substance | <haematology> A polysaccharide precursor molecule which is used to make the antigens on the surface of human blood cells that are classified in the ABO blood group system. (09 Oct 1997) |
| slow-reacting substance | Slow-reacting substance of anaphylaxis (SRS-A), a leukotriene of low molecular weight which is released in anaphylactic shock and produces slower and more prolonged contraction of muscle than does histamine; it is active in the presence of antihistamines (but not epinephrine) and seems not to occur preformed in mast cells, but as a result of an antigen-antibody reaction on the granules. Compare: peptidyl leukotrienes. Synonym: slow-reacting factor of anaphylaxis. (05 Mar 2000) |
| slow reacting substance of anaphylaxis | <immunology> Potent bronchoconstrictor and inflammatory agent released by mast cells, an important mediator of allergic bronchial asthma. A mixture of three leukotrienes (LTC4 mainly, LTD4 and LTE4) (18 Nov 1997) |
| spongy substance | Bone in which the spicules or trabeculae form a three-dimensional latticework (cancellus) with the interstices filled with embryonal connective tissue or bone marrow. Synonym: substantia trabecularis, cancellous bone, spongy bone, spongy substance, trabecular bone. (05 Mar 2000) |
| standard substance | A pure, authentic substance used for identification purposes. (05 Mar 2000) |
| Stilling's gelatinous substance | The central gray matter of the spinal cord surrounding the central canal. Synonym: substantia intermedia centralis et lateralis, anterior gray column, Stilling's gelatinous substance, substantia gelatinosa centralis. (05 Mar 2000) |
| neurosecretory substance | The secretion of nerve cell bodies located in the hypothalamus; the substance is transported by way of hypothalamo-hypophysial tract fibres into the neurohypophysis where the terminals of the nerve fibres contain the secretion. As seen in the fibres and terminals with a light microscope, the substance appears as Herring bodies or hyaline bodies of the pituitary (see under body). See: hyaline bodies of pituitary. (05 Mar 2000) |
| Nissl substance | The material consisting of granular endoplasmic reticulum and ribosomes that occurs in nerve cell bodies and dendrites. Synonym: basophil substance, basophilic substance, chromophil substance, Nissl bodies, Nissl granules, substantia basophilia, tigroid bodies, tigroid substance. (05 Mar 2000) |
| substance | The material constituting an organ or body, also called substantia. Origin: L. Substantia (18 Nov 1997) |
| substance abuse | Maladaptive pattern of drug or alcohol use that may lead to social, occupational, psychological, or physical problems. (05 Mar 2000) |
| substance abuse detection | Detection of drugs that have been abused, overused, or misused, including legal and illegal drugs. Urine screening is the usual method of detection. (12 Dec 1998) |
| substance abuse disorders | A class of mental disorders in which behavioural and biological changes are associated with regular use of alcohol, drugs, and related substances that affect the central nervous system and personal and social functioning. (05 Mar 2000) |
| substance abuse, intravenous | Abuse, overuse, or misuse of a substance by its injection into a vein. (12 Dec 1998) |