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1. To render active.
2. To make radioactive.
Farlex Partner Medical Dictionary © Farlex 2012


tr.v. acti·vated, acti·vating, acti·vates
1. To set in motion; make active or more active.
2. Biology To convert (certain biological compounds) into biologically active derivatives.

ac′ti·va′tion n.
ac′ti·va′tor n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


(1) To render something active.
(2) To make something radioactive.
Chemistry To convert a compound—e.g., a provitamin or enzyme—into an active form or different compound, in particular one that has a specific biologic action
Example, activation by UV light Ergosterol, lumisterol, tachysterol, vitamin D2
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


1. To render active.
2. To make radioactive.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about activate

Q. Are there any nice activities for adults with autism? I've been helping a very nice man of 45 of years old and I'm looking for some new things I can do with him in our time together. any ideas?

A. Autistic people react wonderfully with animals. for instance- i saw a group of severe Autistic teenagers going to swim with dolphins. the effect was amazing! taking him to the zoo, or even to the park to feed ducks, pet dogs, whatever.. could have a great effect on him.
hope i helped!
tell me how it went.

Q. what is a passive smoking? and is it dangerous as an active?

A. Passive smoking is the exposure to cigarettes smoke emitted from cigarettes smoke by other person. It's dangerous and may increase the risk to several diseases similar to active smoking (one's exposure to smoke emitted from the cigarettes he or she is smoking) although the risk is of lower magnitude. Example for passive smoking is children of smokers etc.

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Q. i swim a lot ! what are the advantages of swimming over other sport activities? on what part of the body does it work the most ?

A. its a good workout but your not really going to burn as much calories as a regular work out.

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References in periodicals archive ?
Because only Cu and V showed significant vasoconstrictor activity, we determined whether or not Cu and V could activate ERK1/2 and p38 MAPK.
Activate TLR2 on the white blood cell's surface and it releases one broth of immune molecules; stimulate TLR4 and the dendritic cell secretes a different soup.
As MEHP diffuses into the cell, it also activates PPARs.
The p38 and ERK MAP kinase pathways cooperate to activate ternary complex factors and c-fos transcription in response to UV light.
The presence of a dioxinlike key has always been thought necessary to activate the receptor.
Several environmental agents activate MAP kinases to cause cellular stress and cytotoxic responses, including bacterial products (such as lipopolysaccharide; LPS), pesticides, certain transition metals, and UV radiation (11-13).
Estrogens latch onto so-called estrogen receptors, which in turn bind to and activate select genes.
The demonstration of a functional PPAR in human breast cancer cell lines that can bind specifically to a PPRE indicates that peroxisome proliferators may transcriptionally activate peroxisome proliferator-regulated genes in human breast epithelial cells (53).
Increasing cell temperature from 22 [degrees] C to 45 [degrees] C also activates the receptor, Julius' group discovered.
Li and his colleagues may now have found how HIV resolves this apparent paradox The virus makes a protein that activates quiescent immune cells and transforms them into suitable hosts for replication, they report in the July 22 Proceedings of the National Academy of Sciences.

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