catalyst

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catalyst

 [kat´ah-list]
any substance that brings about catalysis.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cat·a·lyst

(kat'ă-list),
A substance that accelerates a chemical reaction but is not consumed or changed permanently thereby.
Synonym(s): catalyzer
Farlex Partner Medical Dictionary © Farlex 2012

cat·a·lyst

(kat'ă-list)
A substance that accelerates a chemical reaction but is not consumed or changed permanently thereby.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

catalyst

A chemical substance that promotes or accelerates a chemical reaction without itself being changed. Most biochemical catalysts are ENZYMES and almost all body chemistry depends on the catalytic action of thousands of different enzymes.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

catalyst

a compound which is able to increase the speed of a reaction by lowering the ACTIVATION ENERGY needed for the reaction to start. Protein catalysts are called ENZYMES and are found in all living cells.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Catalyst

A substance that causes the next step in a pathway or reaction to occur, but is not physically changed by the process.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

cat·a·lyst

(kat'ă-list)
A substance that accelerates a chemical reaction but is not consumed or changed permanently thereby.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about catalyst

Q. Does alcohol drinking act as a catalyst of a problem? Does alcohol drinking act as a catalyst of a problem? My father has been battling depression and anxiety for many years and he used to drink in the past. Recently his behavior associated with drinking is visible and I strongly suspect that he is drinking again. Generally we get silly after drinking but my dad`s perception are altered in a negative way….

A. Yes that’s true… when I drink my depression gets amplified. And this almost happens on the issues which hurts me. Sometimes it becomes self destructive. One should even look that it doesn’t harm anyone. Keep him under observation for 3 days and if the problem persists, then you must take him to a doctor.

More discussions about catalyst
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References in periodicals archive ?
The Auto Catalysts market provides a chapter highlighting manufacturing process analysis validated via primary information collected through Industry experts and Key officials of profiled companies.
Table-4: The esterification yield by using different catalysts.
The second set of experiments focused on assessing the simulated end of useful life durability of the catalyst. Two full size bricks, with a total volume of 4.3L, of the development diesel cold start concept catalysts were loaded in series on a light-duty diesel truck engine (which is different from the one used for the sulfur testing) and aged for 230 cycles with total aging time of 200 hours.
In the case of precious metal catalysts, Evonik also offers recycling and precious metal management for the required replacement catalyst at the end of the lifecycle.
Catalysts manufactured by KCC are delivered to the US, Canada, Europe, Russia, the Middle East and East Asia including China.
[10] Pore diameter: Inorganic substances used as catalysts contain many small pores.
He also continued that there are four different bedrocks in acid sulfuric firms, and they need different catalysts when Sulfur dioxide gas is passing through the bedrocks' materials.
Prior to the catalytic evaluation, all of the catalysts were heated at 400[degrees]C in an [N.sub.2] atmosphere and then sulfided in situ by flowing a 10% [H.sub.2]S/[H.sub.2] gas mixture at 400[degrees]C for 1 h.
It consists of a curing agent and a curing catalyst that drives the crosslinking reaction at a rate appropriate to the application.
The deactivation of cobalt catalysts is mainly due to the following reasons: oxidation of cobalt metal, cobalt support interactions, metal migration into the support lattice resulting in the formation of the inactive compounds (e.g.
Additives for PUR foam include amine, morpholine, organometallic catalysts; crosslinkers, chain extenders; and silicone/nonsilicone surfactants:
International Resource News-September 26, 2016--Air Products launches new series of catalyst and additive technologies