| oxygen toxicity | A body disturbance resulting from breathing high partial pressures of oxygen; characterised by visual and hearing abnormalities, unusual fatigue while breathing, muscular twitching, anxiety, confusion, incoordination, and convulsions; although the mechanism for development of the condition is obscure, a disruption of enzymatic activity is likely, perhaps as a result of free radical formation. Synonym: oxygen poisoning. (05 Mar 2000) |
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| toxicity | The quality of being poisonous, especially the degree of virulence of a toxic microbe or of a poison. (18 Nov 1997) |
| toxicity test | <investigation> Controlled laboratory test to determine the toxicity of a chemical to an organism in terms of specific chemical concentrations. An acute toxicity test establishes the concentration required to kill a predetermined proportion of test organisms within a relatively short period of time, typically 4 days or less. A chronic toxicity test reveals the effects of a sublethal concentration applied throughout all or part of the life cycle. (12 Jan 1998) |
| toxicity tests | Tests that determine the toxicity of a substance. These include tests of clinical drugs, foods, environmental pollutants, etc. (12 Dec 1998) |
| ep toxicity | A test defined by the federal Environmental Protection Agency to check a substance for the presence of arsenic, barium, cadmium, chromium, lead, mercury, selenium, or silver. 40 CFR 261.24 defines the concentrations constituting hazardous waste and the test procedure. (05 Dec 1998) |
| anaemia, neonatal | The mildest form of erythroblastosis foetalis in which anaemia is the chief manifestation. (12 Dec 1998) |
| benign neonatal convulsions | A familial, self-limited epilepsy, beginning at two or three days of age and resolving spontaneously by six months of age; autosomal dominant inheritance. (05 Mar 2000) |
| Brazelton's Neonatal Behavioural Assessment Scale | A scale used by obstetricians, paediatricians, and paediatric psychologists to assess the sensory, motor, emotional and physical development of the neonate, usually beginning at birth or in the first month of life. (05 Mar 2000) |
| rate, neonatal mortality | The number of children dying under 28 days of age divided by the number of live births that year. The neonatal mortality rate in the united states, which was 8.4 per 1,000 live births in 1980, declined to 5.8 per 1,000 live births in 1990. (12 Dec 1998) |
| mortality rate, neonatal | The number of children dying under 28 days of age divided by the number of live births that year. The neonatal mortality rate in the united states, which was 8.4 per 1,000 live births in 1980, declined to 5.8 per 1,000 live births in 1990. (12 Dec 1998) |
| neonatal | <paediatrics> Pertaining to the first four weeks after birth. Origin: L. Natus = born (18 Nov 1997) |
| neonatal abstinence syndrome | <syndrome> Foetal and neonatal addiction and withdrawal as a result of the mother's dependence on drugs during pregnancy. Withdrawal or abstinence symptoms develop shortly after birth. Symptoms exhibited are loud, high-pitched crying, sweating, yawning and gastrointestinal disturbances. (12 Dec 1998) |
| neonatal anaemia | <haematology> A condition which develops in the foetus due to an incompatibility between the mother's blood type (RH factor) and the baby's. Maternal antibodies, which enter the foetal circulation during delivery attack the baby's red blood cells leading to haemolysis (rupture of the cells). Symptoms include an infant with an enlarged liver and spleen, swelling, jaundice and anaemia. (27 Sep 1997) |
| neonatal apoplexy | Intracranial haemorrhage in newborn children. (05 Mar 2000) |
| neonatal arthritis of foals | Bacterial polyarthritis caused by umbilical infections by several bacterial species. (05 Mar 2000) |