| Pasteur effect | <biochemistry> Decrease in the rate of carbohydrate breakdown that occurs in yeast and other cells when switched from anaerobic to aerobic conditions. Results from a relatively slow flux of material through the biochemical pathways of respiration compared with those of fermentation. (18 Nov 1997) |
|---|---|
| Pasteur's effect | The inhibition of fermentation by oxygen, first observed by Pasteur; either not observed, or only slightly observed, in malignant tumours. Compare: Crabtree effect. (05 Mar 2000) |
| glucose effect | <biochemistry> The ability of the sugar glucose to block sugar metabolism by keeping the genes which make the enzymes involved in the early steps of sugar metabolism from making those enzymes. (09 Oct 1997) |
| greenhouse effect | The effect of certain gases in the Earth's atmosphere in trapping heat from the sun. (05 Dec 1998) |
| Rivero-Carvallo effect | Inspiratory increase in the systolic murmur of tricuspid insufficiency; the characteristic distinguishing tricuspid insufficiency from mitral insufficiency. (05 Mar 2000) |
| Circe effect | An effect observed in enzyme catalysis in which accelerated diffusion of the substrate occurs through attractive forces of the enzyme's active site. (05 Mar 2000) |
| clasp-knife effect | Initial increased resistance to stretch of the extensor muscles of a joint that give way rather suddenly allowing the joint then to be easily flexed; the rigidity is due to an exaggeration of the stretch reflex. See: lengthening reaction. Synonym: clasp-knife effect, clasp-knife rigidity. (05 Mar 2000) |
| photechic effect | The ability of an agent, other than light, to make a developable latent image in a photographic film emulsion. Synonym: Russell effect. (05 Mar 2000) |
| photoelectric effect | <chemistry, radiobiology> The interaction of a photon with an atom, resulting in the absorption of the incident photon and the release of a bound electron from that atom with energy equal to the photon energy less the electron binding energy. (16 Dec 1997) |
| mirror effect | <physics> A charged particle travelling into an increasing magnetic field will (if the field becomes strong enough) reverse direction and be reflected back. This is a direct result of the adiabatic invariance of the magnetic moment. Plasmas can be confined by devices which utilise this effect. The effect also occurs in some toroidal plasmas, since the toroidal magnetic field is stronger on the inboard side than on the outboard side, in this case it gives rise to so-called neoclassical effects. The strength of the mirror is determined by the mirror ratio. (09 Oct 1997) |
| piezoelectric effect | The property of certain crystalline or ceramic materials to emit electricity when deformed and to deform when an electric current is passed across them, a mechanism of interconverting electrical and acoustic energy; an ultrasound transducer sends and receives acoustic energy using this effect. (05 Mar 2000) |
| cohort effect | Variation in health status arising from different causal factors to which each birth cohort in a population is exposed as environment and society change. (12 Dec 1998) |
| Wedensky effect | A relatively long enhancing effect following application of a maximal shock or stimulus to a neuromuscular preparation during which a subthreshold stimulation, otherwise too small to evoke a response, will produce a response; a relatively prolonged lowered threshold of excitability following a maximal shock. (05 Mar 2000) |
| placebo effect | An effect usually, but not necessarily, beneficial that is attributable to an expectation that the regimen will have an effect, i.e., the effect is due to the power of suggestion. (12 Dec 1998) |
| common ion effect | <chemistry> The influence on an equilibrium by the presence of a substance which contains ions that participate in the equilibrium. (09 Oct 1997) |