| OGF | ovarian growth factor; oxygen gain factor |
|---|---|
| OSF | organ system failure; osteoclast-stimulating factor; outer spiral fiber; overgrowth stimulating fact... |
| OTF | octamer-binding transcription factor; oral transfer factor |
| PPF | pellagra preventive factor; phagocytosis promoting factor; phosphonoformate; plasma protein fraction... |
| PRF | partial reinforcement; patient report form; perforin; plasma recognition factor; pontine reticular f... |
| neutrophil activating factor | <cytokine> A cytokine that activates neutrophils and attracts neutrophils and T-lymphocytes. It is released by several cell types including monocytes, macrophages, T-lymphocytes, fibroblasts, endothelial cells, and keratinocytes by an inflammatory stimulus. Il-8 is a member of the beta-thromboglobulin superfamily and structurally related to platelet factor 4. Acronym: IL-8 (12 Dec 1998) |
|---|---|
| neutrophil chemotactant factor | <cytokine> A cytokine that activates neutrophils and attracts neutrophils and T-lymphocytes. It is released by several cell types including monocytes, macrophages, T-lymphocytes, fibroblasts, endothelial cells, and keratinocytes by an inflammatory stimulus. Il-8 is a member of the beta-thromboglobulin superfamily and structurally related to platelet factor 4. Acronym: IL-8 (12 Dec 1998) |
| stringent factor | The gene product (an enzyme) that is crucial to the cellular response of decreased ribosome production as a result of amino acid starvation. See: stringent response. (05 Mar 2000) |
| Stuart-Prower factor | <chemical> Storage-stable glycoprotein blood coagulation factor that can be activated to factor xa by both the intrinsic and extrinsic pathways. A deficiency of factor x, sometimes called stuart-prower factor deficiency, may lead to a systemic coagulation disorder. Chemical name: Blood-coagulation factor X (12 Dec 1998) |
| nuclear factor 1 | See: CTF. (18 Nov 1997) |
| sulfation factor | <protein> Peptide hormone (4 kD) that is produced in the liver and is released in response to somatotropin. Somatomedin stimulates the growth of bone and muscle and also influences calcium, phosphate, carbohydrate and lipid metabolism. See: insulin like growth factor. (18 Nov 1997) |
| sun protection factor | A number on a scale (from 2 upwards) for rating sunscreens. Sunscreens with an spt of 15 or higher provide the best protection from the sun's harmful rays. (12 Dec 1998) |
| decapacitation factor | A factor, postulated to be present in epididymal fluid and seminal plasma, that prevents the capacitation of spermatozoa. (05 Mar 2000) |
| decay accelerating factor | <biochemistry, protein> Plasma protein that regulates complement cascade by blocking the formation of the C3bBb complex (the C3 convertase of the alternate pathway). Widely distributed in tissues but deficient in paroxysmal nocturnal haemoglobinuria. (18 Nov 1997) |
| suppressor factor | <immunology> Factors released by T suppressor cells. See: suppressor mutation, ochre suppressor, opal suppressor. (19 Jan 1998) |
| diabetogenic factor | Rarely used term for a factor in crude extracts of the anterior lobe of the hypophysis that produces degenerative changes in the islet cells of the pancreas and causes permanent diabetes. (05 Mar 2000) |
| diffusing factor | <enzyme> Enzyme that degrades hyaluronic acid, found in lysosomes. (18 Nov 1997) |
| direct lytic factor of cobra venom | A polypeptide of 62 residues; action on cells is similar to that of melittin in that it promotes disruption of membranes; used as an investigational antirheumatic agent. Synonym: cobra toxin, direct lytic factor of cobra venom. (05 Mar 2000) |
| Duran-Reynals permeability factor | <enzyme> Enzyme that degrades hyaluronic acid, found in lysosomes. (18 Nov 1997) |
| duty factor | <radiobiology> Ratio of the duration of time when a system is actually operating to the total time for a complete cycle of the system. For example: if a tokamak experiment runs for 5 seconds and then sits for 500 seconds while the power supplies are recharged, then the duty factor is 1%. Similar to capacity factor for powerplants. Synonym: duty cycle. (09 Oct 1997) |