raw materials: Materials taken from nature used in manufacture. reagents: Chemical substances used in analysis and synthesis because of the reactions it causes. recession: The act of receeding or withdrawing. reciprocal: The counterpart. recombinant DNA: Any of the various techniques for inserting DNA fragments from the genes of one organism directly into the chromosomes of another so as to change genetic makeup: used in basic research and to produce vaccenes, hormones, etc. Also called gene-splicing. reproduction: Something made from copying the original. resin: Solid or semisolid substance, obtained from plants or in the lab by chaining molecules together. Used in medicine and for paint and varnish. Many resins are polymers. resinous: Full of or like resin. retardancy: The ability to slow down a process. Flame retardancy is the ability to slow down combustion. retention: The ability to hold something. e.g. water retention is the ability to hold water. rhizosphere: The soil volume surrounding the root. rice: Oryza sativa The starchy seeds or grain of a grass, cultivated in warm climates and used for food. rosemary: Rosemarinus officinalis. An evergreen shrub, used as a seasoning and a perfume. Native to the Mediterranean region. rotenone: C23H22O6. A white crystalline, water-insoluble, poisonous heterocyclic compound, obtained from derris root: used cheifly as the active ingredient of certain insecticides and in medicine in the treatment of chiggers and scabies.
Index