| oxidizing agent | <chemistry> A reactant that accepts electrons from another reactant. The oxidizing agent is the species getting reduced. (09 Jan 1998) |
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| oxidopamine | <chemical> 5-(2-aminoethyl)-1,2,4-benzenetriol. A catecholamine, vasoactive neurotoxic compound which depletes noradrenergic stores in nerve endings and induces a reduction of dopamine levels in the brain. The compound has been used clinically for purging of neuroblastoma cells prior to autologous bone marrow transplantation. When used by subconjunctival injection it produces reversible chemical sympathectomy in glaucoma. Pharmacological action: adrenergic agents, sympatholytics. Chemical name: 1,2,4-Benzenetriol, 5-(2-aminoethyl)- (12 Dec 1998) |
| oxidoreductase | <enzyme> An oxidase that uses molecular oxygen as the electron acceptor. (18 Nov 1997) |
| oxidoreductases | <enzyme> The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidised is regarded as a hydrogen donor. The systematic name is based on donor:acceptor oxidoreductase. The recommended name will be dehydrogenase, wherever this is possible; as an alternative, reductase can be used. Oxidase is only used in cases where o2 is the acceptor. (enzyme nomenclature, 1992, p9) Registry number: EC 1. (12 Dec 1998) |
| oxidoreductases, n-demethylating | <enzyme> Registry number: EC 1.5. (12 Dec 1998) |
| oxidoreductases, o-demethylating | <enzyme> Drug metabolizing enzymes which oxidise methyl ethers. Usually found in liver microsomes. Registry number: EC 1.- (12 Dec 1998) |
| oxidulated | <chemistry> Existing in the state of a protoxide; said of an oxide. Source: Websters Dictionary (01 Mar 1998) |
| oxime | <chemistry> One of a series of isonitroso derivatives obtained by the action of hydroxylamine on aldehydes or ketones. Source: Websters Dictionary (01 Mar 1998) |
| oximes | Compounds (cis or trans) that contain the radical, =c:n.oh; a condensation product of aldehydes or ketones. Members of this group frequently function as cholinesterase reactivators. (12 Dec 1998) |
| oximeter | A photoelectric device that measures the amount of oxygen inblood and other fluids. An instrument that measures the oxygenlevels in an enclosed, controlled space such as an incubator or bioreactor. (09 Oct 1997) |
| oximetry | The determination of oxygen-haemoglobin saturation of blood either by withdrawing a sample and passing it through a classical photoelectric oximeter or by electrodes attached to some translucent part of the body like finger, earlobe, or skin fold. It includes non-invasive oxygen monitoring by pulse oximetry. (12 Dec 1998) |
| oxindol | <chemistry> A white crystalline nitrogenous substance (C8H7NO) of the indol group, obtained by the reduction of dioxindol. It is a so-called lactam compound. Origin: Oxygen + indol. Source: Websters Dictionary (01 Mar 1998) |
| oxiodic | <chemistry> Pertaining to, or designating, certain compounds of iodine and oxygen. Origin: Oxy- (a) + iodic. Source: Websters Dictionary (01 Mar 1998) |
| oxirane | <chemical> Chemical name: Oxirane (12 Dec 1998) |
| oxlip | <botany> The great cowslip (Primula veris, var. Elatior). Origin: AS. Oxanslyppe. See Ox, and Cowslip. Source: Websters Dictionary (01 Mar 1998) |