| start codon | The codon 5' AUG in mRNA, at which polypeptide synthesis is started. It is recognised by formylmethionyl tRNA in bacteria and by methionyl tRNA in eukaryotes. (18 Nov 1997) |
|---|---|
| starter | Short pre-existing polynucleotide chain towhich new deoxyribonucleotides can be added by DNA polymerase. (09 Oct 1997) |
| starter tRNA | TRNA in prokaryotes containing a formyl-methionyl residue that initiates translation. Synonym: formyl-methionyl-tRNA, starter tRNA. (05 Mar 2000) |
| starthroat | <ornithology> Any humming bird of the genus Heliomaster. The feathers of the throat have a brilliant metallic luster. Source: Websters Dictionary (01 Mar 1998) |
| starting friction | The force that must be overcome to initiate the motion of one body relative to another because they have been resting in contact. Compare: dynamic friction. Synonym: static friction. (05 Mar 2000) |
| startle epilepsy | A form of reflex epilepsy precipitated by sudden noises. (05 Mar 2000) |
| startle reaction | A complex involuntary response to an unexpected strong stimulus usually auditory in nature. (12 Dec 1998) |
| startle reflex | The reflex response of an infant (contraction of the limb and neck muscles) when allowed to drop a short distance through the air or startled by a sudden noise or jolt. Synonym: Moro reflex, parachute reflex, startle reaction. Synonym: cochleopalpebral reflex. (05 Mar 2000) |
| starvation | Lengthy and continuous deprivation of food. (12 Dec 1998) |
| starvation acidosis | Ketoacidosis resulting from lack of food intake, leading to fat catabolism to provide energy, releasing acidic ketone bodies. (05 Mar 2000) |
| starvation diabetes | After prolonged fasting, glycosuria following the ingestion of carbohydrate or glucose because of reduced output of insulin and/or reduced rate of glucose metabolism with a reduced ability to form glycogen. (05 Mar 2000) |
| starve | 1. To destroy with cold. "From beds of raging fire, to starve in ice Their soft ethereal warmth." (Milton) 2. To kill with hunger; as, maliciously to starve a man is, in law, murder. 3. To distress or subdue by famine; as, to starvea garrison into a surrender. "Attalus endeavored to starve Italy by stopping their convoy of provisions from Africa." (Arbuthnot) 4. To destroy by want of any kind; as, to starve plans by depriving them of proper light and air. 5. To deprive of force or vigor; to disable. "The pens of historians, writing thereof, seemed starved for matter in an age so fruitful of memorable actions." (Fuller) "The powers of their minds are starved by disuse." (Locke) Source: Websters Dictionary (01 Mar 1998) |
| starwort | <botany> Any plant of the genus Aster. See Aster. A small plant of the genus Stellaria, having star-shaped flowers; star flower; chickweed. Water starwort, an aquatic plant (Callitriche verna) having some resemblance to chickweed. Yellow starwort, a plant of the genus Inula; elecampane. Source: Websters Dictionary (01 Mar 1998) |
| Stas, Jean-Servais | <person> Belgian chemist, 1813-1891. See: Stas-Otto method. (05 Mar 2000) |
| Stas-Otto method | A method of extraction of alkaloids from plants and animal bodies: the substance is digested in alcohol and tartaric acid, the fatty and resinous matters are precipitated with water, the fluid is made alkaline, and the alkaloids are extracted with ether or chloroform. (05 Mar 2000) |