Dictionary » C » Catalyst



noun, plural catalyst

A substance capable of initiating or speeding up a chemical reaction.


Chemical reaction can proceed spontaneously even without a catalyst but it would be too slow. The presence of a catalyst can make chemical reactions proceed faster by a factor of several million times. The catalyst may be chemically transformed but only transiently during the reaction. By the end of the reaction, the catalyst is regenerated unchanged, and unconsumed in the reaction. An example of catalyst is an enzyme used by biological reactions.

Word origin: from catalysis ยป from Gk. kata "down" + -lysis "a loosening".

Related forms: catalytic (adjective), catalysis (noun), catalyze (verb).
Related terms: organic catalyst, raney catalyst.

Compare: inhibitor.

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Why do Africans have large noses and lips?

Hey SHF, you're so right. The sun is only a catalyst in releasing Vitamin-D that is already in the body from food stuff. If i remember correctly (not attached) The stuff the turns into Vitamin-D just requires a certain amount of radiation to go ...

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by Riyn
Sun Nov 11, 2012 1:15 pm
Forum: Human Biology
Topic: Why do Africans have large noses and lips?
Replies: 31
Views: 217422

Do the simplest bacteria have ribosomes and helicase?

... acids. When you think of chemical reaction conditions and energies, take temperature into account. At high temperatures things can go even w/o catalyst present, and pre-life Earth was quite harsh by todays standards.

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by dustman
Fri May 25, 2012 2:13 pm
Forum: Molecular Biology
Topic: Do the simplest bacteria have ribosomes and helicase?
Replies: 27
Views: 13993

Re: How much ATP a person consumes...?

... some glycoside hydrolase would break the bond - It would probably couple ATP hydrolysis or NADH/FADH hydrolyis and use a positive magnesium ion catalyst. I'd have to find out more info and do a Gibbs on that one. I have no idea regarding the exact energy consumption. Does anyone else?

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by billyfisher100
Mon Mar 26, 2012 5:54 pm
Forum: Cell Biology
Topic: How much ATP a person consumes...?
Replies: 16
Views: 20899

I want you like X wants Y type sentences

How about: I want you like Hexokinase wants a magnesium catalyst.

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by billyfisher100
Mon Jan 23, 2012 6:44 pm
Forum: General Discussion
Topic: I want you like X wants Y type sentences
Replies: 10
Views: 6941

Identifying Bacteria

... Gram + Cell Shape rods and chains No motility favorite temp 37 no color on the Agar it is aerobic positive for glucose,and mannitol, MR test, and Catalyst Neg for vp It is also weak in for starch. I crossed out many of the choices due to the shape.. Here are the rest of the choices. Bacillus cereus, ...

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by sasha25
Tue Nov 29, 2011 1:01 am
Forum: Microbiology
Topic: Identifying Bacteria
Replies: 1
Views: 1541
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