| PRF | partial reinforcement; patient report form; perforin; plasma recognition factor; pontine reticular f... |
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| PSF | peak scatter factor; peptide supply factor; point spread function; pseudosarcomatous fasciitis |
| RIF | radiological interface; release-inhibiting factor; rifampin; right iliac fossa; rosette-inhibiting f... |
| SBF | serologic-blocking factor; specific blocking factor; splanchnic blood flow |
| SDF | slow death factor; stress distribution factor |
| quality factor | <radiobiology> (Q) A multiplying factor used with absorbed dose to convert to dose equivalent and therefore to express the radiation's effectiveness in causing biological effects. (16 Dec 1997) |
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| inhibition factor | <growth factor> A soluble, nondialysable factor that is produced by sensitised lymphocytes following exposure to a specific antigen. It inhibits macrophage migration and causes adherence. It was originally defined on the basis of inhibition of emigration of mononuclear cells from capillary (haematocrit) tubes, more recently a 13 kD protein with migration inhibitory activity has been isolated. Acronym: MIF Synonym: inhibition factor. (22 Sep 2002) |
| initiation factor | One of several soluble proteins involved in the initiation of protein or RNA synthesis. (05 Mar 2000) |
| insulin activating factor | <chemical> Activates insulin gene transcription in pancreatic beta cells. Synonym: insaf (05 Dec 1998) |
| insulin-antagonizing factor | A principle in extracts of the anterior lobe of the hypophysis that raises the blood sugar and antagonises the action of insulin; purified pituitary growth hormone produces an identical effect. Synonym: insulin-antagonizing factor. (05 Mar 2000) |
| insulin like growth factor | <growth factor> Insulin like growth factors I and II are polypeptides with considerable sequence similarity to insulin. They are capable of eliciting the same biological responses, including mitogenesis in cell culture. On the cell surface, there are two types of insulin like growth factor receptor, one of which closely resembles the insulin receptor (which is also present). Insulin like growth factor I = somatomedin A = somatomedin C Insulin like growth factor II = MSA (Multiplication stimulating activity). Insulin like growth factor 1 is released from the liver in response to growth hormone. Acronym: IGF (18 Nov 1997) |
| insulin-like growth-factor binding protein 1 | One of the six homologous proteins that specifically bind insulin-like growth factors (somatomedins) and modulate their mitogenic and metabolic actions. The function of this protein is not completely defined. However, several studies demonstrate that it inhibits igf binding to cell surface receptors and thereby inhibits igf-mediated mitogenic and cell metabolic actions. (proc soc exp biol med 1993;204(1):4-29) (12 Dec 1998) |
| insulin-like growth factor-binding protein 2 | One of the six homologous soluble proteins that bind insulin-like growth factors (somatomedins) and modulate their mitogenic and metabolic actions at the cellular level. (12 Dec 1998) |
| insulin-like growth factor binding protein 3 | One of the six homologous soluble proteins that bind insulin-like growth factors (somatomedins) and modulate their mitogenic and metabolic actions at the cellular level. (12 Dec 1998) |
| insulin like growth-factor-binding protein 4 | One of the six homologous soluble proteins that bind insulin-like growth factors (somatomedins) and modulate their mitogenic and metabolic actions at the cellular level. (12 Dec 1998) |
| insulin-like growth-factor-binding-protein 5 | One of the six homologous soluble proteins that bind insulin-like growth factors (somatomedins) and modulate their mitogenic and metabolic actions at the cellular level. (12 Dec 1998) |
| insulin-like-growth-factor-binding protein 6 | One of the six homologous soluble proteins that bind insulin-like growth factors (somatomedins) and modulate their mitogenic and metabolic actions at the cellular level. (12 Dec 1998) |
| insulin-like growth-factor-binding proteins | A family of soluble proteins that bind insulin-like growth factors and modulate their biological actions at the cellular level. (int j gynaecol obstet 1992;39(1):3-9) (12 Dec 1998) |
| insulin-like growth factor I | <chemical> A well-characterised basic peptide believed to be secreted by the liver and to circulate in the blood. It has growth-regulating, insulin-like, and mitogenic activities. This growth factor has a major, but not absolute, dependence on somatotropin. It is believed to be mainly active in adults in contrast to insulin-like growth factor II, which is a major foetal growth factor. Chemical name: Insulin-like growth factor I (12 Dec 1998) |
| insulin-like growth factor II | <chemical> A well-characterised neutral peptide believed to be secreted by the liver and to circulate in the blood. It has growth-regulating, insulin-like and mitogenic activities. The growth factor has a major, but not absolute, dependence on somatotropin. It is believed to be a major foetal growth factor in contrast to insulin-like growth factor I, which is a major growth factor in adults. Chemical name: Insulin-like growth factor II (12 Dec 1998) |