| oligodendria | A class of neuroglial (macroglial) cells in the central nervous system. Oligodendroglia may be called interfascicular, perivascular, or perineuronal satellite cells according to their location. The most important recognised function of these cells is the formation of the insulating myelin sheaths of axons in the central nervous system. (12 Dec 1998) |
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| oligodendroblast | A primitive glial cell that is the normal precursor cell of the oligodendrocyte. (05 Mar 2000) |
| oligodendroblastoma | <tumour> Obsolete term for oligodendroglioma. Origin: oligo-+ G. Dendron, tree, + blastos, germ, + -oma (05 Mar 2000) |
| oligodendrocyte | Neuroglial cell of the central nervous system in vertebrates whose function is to myelinate CNS axons. (18 Nov 1997) |
| oligodendroglia | A class of neuroglial (macroglial) cells in the central nervous system. Oligodendroglia may be called interfascicular, perivascular, or perineuronal satellite cells according to their location. The most important recognised function of these cells is the formation of the insulating myelin sheaths of axons in the central nervous system. (12 Dec 1998) |
| oligodendroglia cells | See: oligodendroglia. (05 Mar 2000) |
| oligodendroglioma | <oncology, tumour> May be subdivided into primary brain tumours and the more common, secondary brain tumours. Primary brain tumours (for example astrocytoma, craniopharyngioma, glioma, ependymoma, neuroglioma, oligodendroglioma, glioblastoma multiforme, meningioma, medulloblastoma) arise from the uncontrolled proliferation of cells within the brain. Secondary brain tumours occur from the spread of cancer into the brain from a distant cancerous organ (metastasis). Common symptoms of a brain tumour include headache, nausea, vomiting, seizures, change in mentation, neurologic symptoms and loss of memory. (27 Sep 1997) |
| oligodeoxyribonucleotides | A group of deoxyribonucleotides (up to 12) in which the phosphate residues of each deoxyribonucleotide act as bridges in forming diester linkages between the deoxyribose moieties. (12 Dec 1998) |
| oligodipsia | Abnormal lack of thirst. See: hypodipsia. Origin: oligo-+ G. Dipsa, thirst (05 Mar 2000) |
| oligodontia | Synonym: hypodontia. Origin: oligo-+ G. Odous, tooth (05 Mar 2000) |
| oligodynamic | Active in very small quantity; e.g., the germicidal effect of an exceedingly dilute solution (such as one to one hundred million) of copper in distilled water. Origin: oligo-+ G. Dynamis, power (05 Mar 2000) |
| oligoelement | A chemical substance, minute amounts of which can be found in living organisms. (18 Nov 1997) |
| oligogalactia | Slight or scant secretion of milk. Origin: oligo-+ G. Gala, milk (05 Mar 2000) |
| oligogalacturonate lyase | <enzyme> Forms monomer units in the breakdown of pectate Registry number: EC 4.2.2.- (26 Jun 1999) |
| oligoglucan-branching glycosyltransferase | A glucosyltransferase that transfers an alpha-glucosyl residue in a 1,4-alpha-glucan to the primary hydroxyl group of glucose in a 1,4-alpha-glucan. See: 1,4-alpha-d-glucan branching enzyme. Synonym: oligoglucan-branching glycosyltransferase. (05 Mar 2000) |