metathesis

[mĕ-tath´ĕ-sis]

1. artificial transfer of a morbid process.

2. a chemical reaction in which an element or radical in one compound exchanges places with another element or radical in another compound.

me·tath·e·sis

(me-tath'ĕ-sis),

1. Transfer of a pathologic product (for example, a calculus) from one place to another where it causes less inconvenience or injury, when it is not possible or expedient to remove it from the body.

2. In chemistry, a double decomposition, wherein a compound, A-B, reacts with another compound, C-D, to yield A-C + B-D, or A-D + B-C.

[meta- + G. thesis, a placing]

Farlex Partner Medical Dictionary © Farlex 2012

me·tath·e·sis

(me-tath'ĕ-sis)

1. Transfer of a pathologic product (e.g., a calculus) from one place to another where it causes less inconvenience or injury, when it is not possible or expedient to remove it from the body.

2. chemistry A double decomposition, wherein a compound, A-B, reacts with another compound, C-D, to yield A-C + B-D, or A-D + B-C.

[meta- + G. thesis, a placing]

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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References in periodicals archive

The term Metathesis is a Greek word that refers to reordering of segments.

Metathesis in Balochi

The ethenolysis process advancement represents an important milestone for the development of a second-generation metathesis technology--the first of its kind --enabling an enhanced product portfolio from natural oils metathesis.

Elevance partner collaborations advance second-generation biorefinery technology

Activity, healing efficiency, and temperature of metathesis activation are closely related to the specific combination chosen to formulate the autorepair material [9].

Evaluation of the mechanical properties of microcapsule-based self-healing composites

The synthesis of ionic liquids is depicted in Scheme 1, showing preparation of cation with halide followed by replacement of halide via ion exchange metathesis with anion of the choice (thiosalicylate ion) [27].

Synthesis of Thiosalicylate based Hydrophobic Ionic Liquids and their Applications in Metal Extraction from aqueous solutions

Fatty esters of cellulose from olive pomace and barley bran: Improved mechanical properties by metathesis crosslinking.

Effectiveness of treated paper in oil spills cleanup

In these systems, the efficiency of self-repair function, in terms of trigger, speed and yield, is related to ring-opening metathesis polymerization of the healing agent b> appmpnate catalysts.

Self-healing materials for structural applications

McCullough, "A simple method to prepare head-to-tail coupled, regioregular poly(3-alkylthiophenes) using Grignard metathesis," Advanced Materials, vol.

Utilization of zinc dust for a core monomer 2-bromo-3-hexylthien-5-ylzinc bromide: its synthesis and application for the preparation of regioregular poly(3-hexylthiophene)

We envisioned that the synthesis of (+)-[alpha]-Conhydrine could be achieved by employing stereoselective allylation and ring closing metathesis as key strategy to create this root as more feasible and simple.

Stereoselective synthesis of (+)-[alpha]-Conhydrine from R-(+)-glyceraldehyde

Their topics include hybrid catalysts for olefin metathesis and related polymerizations, spillover phenomena in electrocatalysis for oxygen and hydrogen electrode reactions, catalytic applications of polyoxometalates encapsulated in inorganic materials, functionalized porous silicates as catalysts for water and air purification, and palladium catalysts deposited on functionally modified siliceous supports.

New and future developments in catalysis; hybrid materials, composites, and organocatalysts

Trans-polyoctylene rubber (TOR) is a low-molecular-weight polymer, made from cyclo-octene by metathesis polymerization, and has been known as a compatibilizer for incompatible blends as well as a processing aid.

The influences of TOR as a compatibilizer on cure characteristic and morphological properties of SBR/CRR blends