| pollen | <plant biology> The microspores of seed plants, the powdery mass of microspores shed from anthers. (09 Oct 1997) |
|---|---|
| pollen antigen | An extract of the antigenic protein from the pollen of plants; i.e., pollen allergen, used in the diagnosis and prevention of hay fever. (05 Mar 2000) |
| pollen extract | Liquid obtained by extracting the protein from the pollen of plants used for diagnostic testing or treatment. (05 Mar 2000) |
| pollen mother cell | <plant biology> A diploid plant cell that forms four microspores by meiosis, the microspores give rise to pollen grains in seed plants. (18 Nov 1997) |
| pancreatic extracts | Extracts prepared from pancreatic tissue that may contain the pancreatic enzymes or other specific uncharacterised factors or proteins with specific activities. Pancreatin is a specific extract containing digestive enzymes and used to treat pancreatic insufficiency. (12 Dec 1998) |
| cell extracts | Preparations of cell constituents or subcellular materials, isolates, or substances. (12 Dec 1998) |
| placental extracts | Extracts prepared from placental tissue; they may contain specific but uncharacterised factors or proteins with specific activities. (12 Dec 1998) |
| plant extracts | Concentrated pharmaceutical preparations of plants obtained by removing the active constituents therefrom with a suitable menstruum, evaporating all or nearly all the solvent, and adjusting the residual mass or powder to a prescribed standard. (12 Dec 1998) |
| thymus extracts | Extracts of the thymus that contain specific, but uncharacterised factors or proteins with specific activities; three distinct substances are already known: thymotoxin, thymin and thymosin. (12 Dec 1998) |
| tissue extracts | Preparations made from animal tissues or organs; they usually contain many components, any one of which may be pharmacologically or physiologically active; extracts may contain specific, but uncharacterised factors or proteins with specific actions. (12 Dec 1998) |
| liver extracts | <chemical> Extracts of liver tissue containing uncharacterised specific factors with specific activities; a soluble thermostable fraction of mammalian liver is used in the treatment of pernicious anaemia. Pharmacological action: haematinics. (12 Dec 1998) |