| oxidation-reduction indicator | A substance that undergoes a definite colour change at a specific oxidation potential. Synonym: redox indicator. (05 Mar 2000) |
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| alizarin indicator | A solution consisting of 1 g sodium alizarin sulfonate dissolved in 100 cc distilled water; used as an indicator for free acidity in gastric contents. (05 Mar 2000) |
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| management indicator species | A species whose habitat requirements most reflect those of the species community in the habitat of concern, usually used to indicate habitat quality and to predict future conditions. (09 Oct 1997) |
| redox indicator | A substance that undergoes a definite colour change at a specific oxidation potential. Synonym: redox indicator. (05 Mar 2000) |
| wetland indicator status | <ecology> The exclusiveness with which a plant species occurs in wetland, the different indicator categories (i.e., facultative species, and obligate wetland species) are defined elsewhere in this glossary. (09 Oct 1997) |
| health indicator | Variable, susceptible to direct measurement, that reflects the state of health of persons in a community. (05 Mar 2000) |
| indicator | An event, entity or condition that typically characterises a prescribed environment or situation, indicators determine or aid in determining whether or not certain stated circumstances exist or criteria are satisfied. (09 Oct 1997) |
| indicator-dilution curve | Graph of the serial concentrations (dilutions) of a dye, e.g., Evans blue, following its intravascular or intracardiac injection; useful in the diagnosis of congenital cardiac shunts, measurement of cardiac output, and detection of cardiovalvular incompetence. Synonym: indicator-dilution curve. (05 Mar 2000) |
| indicator dilution method | hamilton-Stewart method |
| indicator dilution techniques | Methods for assessing flow through a system by injection of a known quantity of an indicator, such as a dye, radionuclide, or chilled liquid, into the system and monitoring its concentration over time at a specific point in the system. (12 Dec 1998) |
| indicator organisms | Organisms that respond predictably to various environmental changes, and whose presence, or abundance, are used as indicators of environmental conditions. (09 Oct 1997) |
| indicator plant | Plant species indicating some specific characteristic of a certain locality. (09 Oct 1997) |
| indicator system | In in vitro immunological tests, a combination of reagents used to determine the degree to which immunological reagents have combined (e.g., sensitised erythrocytes in complement-fixation tests; enzyme and substrate in enzyme-linked immunosorbent assays). (05 Mar 2000) |
| indicator yellow | A compound formed in the bleaching of rhodopsin by light; it is chrome yellow at pH 3.3-4.0 and pale yellow at pH 9.0-10.0. (05 Mar 2000) |