See Also: Quenching(medicine)
quenching(encyclopedia)

occlusion (iou) and Quenching (medicine)


occlusion (iou)



occlusion noun. M17.
[from Latin occlus- pa. ppl stem of occludere: see OCCLUDE, -ION.]
Chiefly Science. The action of occluding something; the fact of being occluded; Medicine the partial or total closure of a blood-vessel due to an obstacle or to the swelling of an adjacent organ. M17.
b. fig. The blocking out of an idea or thought from one's mind; the exclusion of a subject from a discourse; a mental block. M20.
Dentistry. The position assumed by the two sets of teeth relative to each Other when the mouth is closed; the state of having the jaws closed and the teeth in contact. L19.
Phonetics. The momentary closure of the breath passage during the articulation of an orally released consonant, or of the mouth passage during the articulation of a nasal consonant. E20.
Meteorology. The overtaking of the warm front of a depression by the cold front, so that the warm air between them is forced upwards off the earth's surface by two wedges of cold air; the occluded front so formed. E20.

Quenching (medicine)


quenching


1. The process of extinguishing, removing, or diminishing a physical property such as heat or light; e.g., the cooling of a hot metal rapidly by plunging it into water or oil.

2. In beta liquid scintillation counting, the shifting of the energy spectrum from a true to a lower energy; it is caused by a variety of interfering materials in the counting solution, including foreign chemicals and colouring agents.

3. The process of stopping a chemical or enzymatic reaction.

Origin: M. E. Quenchen, fr. O.E. Acwencan

Fluorescence quenching, a technique used in investigations dealing with binding of antigens (haptens) by purified antibodies, applicable in cases in which the bound antigen (hapten) absorbs (quenches) light emitted during fluorescence of protein (antibody) excited by ultraviolet light.