activator


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activator

 [ak´tĭ-va″ter]
a substance that makes another substance active or reactive, induces a chemical reaction, or combines with an enzyme to increase its catalytic activity.
plasminogen activator a substance that activates plasminogen and converts it into plasmin; see t-plasminogen activator and u-plasminogen activator.
tissue plasminogen activator (TPA, t-PA) (t-plasminogen activator) a serine endopeptidase synthesized by endothelial cells, the major physiologic activator of plasminogen; when bound to fibrin clots it catalyzes the conversion of plasminogen to plasmin by hydrolysis of a specific arginine-valine bond. It can be produced by recombinant technology for use in thrombolytic therapy. It acts directly on blood clots and therefore presents a small risk of systemic bleeding; occasionally allergic reactions may occur.
u-plasminogen activator (urinary plasminogen activator) a serine endopeptidase that acts as a plasminogen activator by catalyzing the preferential cleavage of plasminogen at the same arginine-valine bond where t-plasminogen activator cleaves. It is produced in the kidney and excreted in the urine and is used in thrombolytic therapy (when used as a pharmaceutical, it is usually called urokinase). Unlike t-plasminogen activator or prourokinase, it does not require fibrin for activity. Called also urokinase.

ac·ti·va·tor

(ak'ti-vā-tōr),
1. A substance that renders another substance (for example, a catalyst) active, or that accelerates a process or reaction.
2. The fragment produced by chemical cleavage of a proactivator, that induces the enzymic activity of another substance.
3. An apparatus for making substances radioactive (for example, a neutron generator or a cyclotron).
4. A removable type of myofunctional orthodontic appliance that acts as a passive transmitter of force, produced by the function of the activated muscles, to the teeth and alveolar process that are in contact with it.
5. A protein that binds to a DNA sequence before RNA polymerase transcription, sometimes referred to as coactivator.

Activator

A protein that binds DNA at transcription control or enhancer sites—e.g., for an allosteric enzyme—and upregulates—i.e., positively regulates—gene transcription. Activators either increase binding of RNA polymerase to the promoter site or stimulate RNA polymerase to begin transcription.

ac·ti·va·tor

(ak'ti-vā-tŏr)
1. A substance that renders another substance active, or one that accelerates a process or reaction.
2. The fragment, produced by chemical cleavage of a proactivator, which induces the enzymatic activity of another substance.
3. An apparatus for making substances radioactive.
4. A removable type of myofunctional orthodontic appliance that acts as a passive transmitter of force, which is produced by the function of the activated muscles, to the teeth and alveolar process that are in contact with it.
5. A protein that binds to a DNA sequence before DNA polymerase transcription.
6. Manually assisted thrust instrument that activates mechanoreceptors; used by many chiropractors.

activator

any drug that increases the activity level of the person being treated.

ac·ti·va·tor

(ak'ti-vā-tŏr)
1. A substance that renders another substance active, or accelerates a process or reaction.
2. A removable type of myofunctional orthodontic appliance that acts as a passive transmitter of force, produced by the function of the activated muscles, to the teeth and alveolar process that are in contact with it.
See also: accelerator

Patient discussion about activator

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.

You may read more here:http://www.nlm.nih.gov/medlineplus/secondhandsmoke.html

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.

More discussions about activator
References in periodicals archive ?
A case treated by face mask and Wunderer's activator, extraoral view pretreatment and post-treatment [Figures 8a and b], intraoral view before and after treatment [Figures 9a and b], and cephalograms view before and after treatment [Figures 10a and b].
The activator. Salzmann JA, (ed.) Orthodontics in daily practice.
In addition to its modulatory role in the fibrinolytic system, plasminogen activator
Blasi, "The urokinase plasminogen activator system in cancer: recent advances and implication for prognosis and therapy," Cancer and Metastasis Reviews, vol.
Activator 1000 Odor Control Lemon Lime Formula is a three month treatment that comes in three 8 oz.
In fact, they cite the 2005 National Board of Chiropractic Examiner's Job Analysis, which reported that 51% of American chiropractors have used 'activator', but which failed to distinguish the approach with which the 'activator' was used.
"vRugby is an excellent initiative, introduced by the Rugby Football Union, that allows 16-25 year olds to volunteer and put something back into the sport," said Senior, who has been the vRugby Activator since the start of the season.
It is comprised of a peroxide-based developer component containing, by weight, approximately 6-12% hydrogen peroxide; a powder activator component comprised of 40-80% by weight of an alkali metal persulfate selected from the group consisting of sodium persulfate, potassium persulfate and ammonium persulfate, an alkalizing agent component in an aqueous vehicle comprised of 3-25% of an alkalizing agent by weight; and a colorant present in an amount of from 0.1-2.5% by weight of the powder activator component, wherein the colorant is selected from the group consisting of ultramarine blue, D&C Yellow No.

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