| blood dust | Small refractive particles in the circulating blood, probably lipid material associated with fragmented stroma from red blood cells. Synonym: blood dust, blood motes, dust corpuscles. Origin: haemo-+ G. Konis, dust (05 Mar 2000) |
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| coal dust | <chest medicine> Fine particulate coal dust that is a known respiratory irritant. Coal dust is the underlying cause of the occupational lung disease known as black lung. (27 Sep 1997) |
| cosmic dust | <astronomy> Finely divided solid matter with particle sizes smaller than a micrometeorite, thus with diameters much smaller than a millimeter, moving in interplanetary space. (12 Dec 1998) |
| cotton-dust asthma | <chest medicine> Exposures to cotton dust during the production of yarns, linen and rope can produce chronic obstructive lung disease (after 10 years). Early symptoms include chest tightness. Treatment includes bronchodilators and removal from work environment. (21 Mar 1998) |
| silica dust | Fine particulate dust from quartz rock that is known to cause a progressive lung injury over long-term. See: pneumoconiosis. (27 Sep 1997) |
| dust | 1. Fine, dry particles of earth or other matter, so comminuted that they may be raised and wafted by the wind; that which is crumbled too minute portions; fine powder; as, clouds of dust; bone dust. "Dust thou art, and unto dust shalt thou return." (Gen. Iii. 19) "Stop! for thy tread is on an empire's dust." (Byron) 2. A single particle of earth or other matter. "To touch a dust of England's ground." 3. The earth, as the resting place of the dead. "For now shall sleep in the dust." (Job vii. 21) 4. The earthy remains of bodies once alive; the remains of the human body. "And you may carve a shrine about my dust." (Tennyson) 5. Figuratively, a worthless thing. "And by the merit of vile gold, dross, dust." (Shak) 6. Figuratively, a low or mean condition. "[God] raiseth up the poor out of the dust." (1 Sam. Ii. 8) 7. Gold dust; hence: Coined money; cash. Down with the dust, deposit the cash; pay down the money. "My lord, quoth the king, presently deposit your hundred pounds in gold, or else no going hence all the days of your life. . . . The Abbot down with his dust, and glad he escaped so, returned to Reading." . <botany> Dust brand, a fungous plant (Ustilago Carbo); called also smut. Gold dust, fine particles of gold, such as are obtained in placer mining; often used as money, being transferred by weight. In dust and ashes. See Ashes. To bite the dust. See Bite, To raise, or kick up, dust, to make a commotion. To throw dust in one's eyes, to mislead; to deceive. Origin: AS. Dust; cf. LG. Dust, D. Duist meal dust, OD. Doest, donst, and G. Dunst vapor, OHG. Tunist, dunist, a blowing, wind, Icel. Dust dust, Dan. Dyst mill dust; perh. Akin to L. Fumus smoke, E. Fume. Source: Websters Dictionary (01 Mar 1998) |
| dust asthma | Asthma aggravated by inhalation of dust, especially seen as occupational disease resulting from cotton dust. (05 Mar 2000) |
| dust ball | A mass sometimes found in the stomach or intestine of an animal fed on mill cleanings. (05 Mar 2000) |
| dust cell | Macrophage found in lung and that can be obtained by lung lavage, responsible for clearance of inhaled particles and lung surfactant. Metabolism slightly different from peritoneal macrophages (more oxidative metabolism), often have multivesicular bodies that may represent residual undigested lung surfactant. (18 Nov 1997) |
| dust corpuscles | Small refractive particles in the circulating blood, probably lipid material associated with fragmented stroma from red blood cells. Synonym: blood dust, blood motes, dust corpuscles. Origin: haemo-+ G. Konis, dust (05 Mar 2000) |
| receptors, cytoplasmic and nuclear | Proteins in the cytoplasm or nucleus that specifically bind signalling molecules and trigger changes which influence the behaviour of cells. The major groups are the steroid hormone receptors, which usually are found in the cytoplasm, and the thyroid hormone receptors, which usually are found in the nucleus. Receptors, unlike enzymes, generally do not catalyze chemical changes in their ligands. (12 Dec 1998) |
| Remak's nuclear division | <cell biology> An unusual form of nuclear division, in which the nucleus simply constricts, rather like a cell without chromosome condensation or spindle formation. Partitioning of daughter chromosomes is haphazard. Observed in some Protozoa. (18 Nov 1997) |
| Pelger-Huet nuclear anomaly | Congenital inhibition of lobulation in the nuclei of neutrophilic leukocytes; most cells present band or bilobulate appearance, and only an occasional cell is trilobed; it is not associated with disease, but may be confused with leukocyte "shift to left"; autosomal dominant inheritance. (05 Mar 2000) |
| ribonucleoproteins, small nuclear | Highly conserved nuclear RNA-protein complexes that function in RNA processing in the nucleus, including pre-mRNA splicing and pre-mRNA 3'-end processing in the nucleoplasm. The u3 snrnp is localised in the nucleolus, where it aligns into base pairs with the 28s rrna precursor in a still unidentified region and functions in pre-rrna processing. The u7 snrnp aligns into base pairs with a conserved sequence in the 3'-end of histone pre-mRNA and is an essential cofactor for the cleavage that creates the mature nonadenylated 3'-end. (12 Dec 1998) |
| RNA, heterogeneous nuclear | Nuclear nonribosomal RNA larger than about 1000 nucleotides, the mass of which is rapidly synthesised and degraded within the cell nucleus. Some heterogeneous nuclear RNA may be a precursor to mRNA. However, the great bulk of total hnrna hybridises with nuclear DNA rather than with mRNA. (12 Dec 1998) |