Dictionary » C » Catalyst

Catalyst

Definition

noun, plural catalyst

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


Supplement

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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History of NIH DNA policies

... were created. The combination of cheaper testing, the role of the government, and the countless studies about specific genes appears to be the catalyst for the policies. But, again, if there was any one result or group of results you know of that also spurned the change I would greatly appreciate ...

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by vacuuum
Tue Jan 20, 2015 9:08 pm
 
Forum: General Discussion
Topic: History of NIH DNA policies
Replies: 0
Views: 527

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: 35
Views: 253539

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: 17007

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: 26766

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: 8019
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