activation (redirected from activation analysis)

activation /ac·ti·va·tion/ (ak″tĭ-va´shun)

1. the act or process of rendering active.

2. the transformation of a proenzyme into an active enzyme by the action of a kinase or another enzyme.

3. the process by which the central nervous system is stimulated into activity through the mediation of the reticular activating system.

4. the deliberate induction of a pattern of electrical activity in the brain.

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allosteric activation  increase in enzyme activity by binding of an effector at an allosteric site that affects binding or turnover at the catalytic site.

contact activation  initiation of the intrinsic pathway of coagulation through interaction of coagulation factor XII with various electronegative surfaces.

lymphocyte activation  stimulation of lymphocytes by antigen or mitogens resulting in macromolecular synthesis (RNA, protein, and DNA) and production of lymphokines, followed by proliferation and differentiation of the progeny into various effector and memory cells.

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activation

[ak′tivā′shən]

1 the promotion or production of an activity, such as the generation of a catalyst, protein synthesis, or enzymatic function.

2 the treatment of sewage using a combination of bacteria and air.

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activation

the process of activating.

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activation analysis

a method of analyzing the content of elements in samples of biological material. The sample is bombarded with nuclear particles and the elements in it measured by the radiation emitted by their radioactive daughter products. Called also radioactivation analysis.

activation energy

the difference in energy between the ground state of the reactants in a reaction and the point of maximum energy or transition state of the reactions. Usually lowered by enzyme catalysts.

activation factor

see hageman factor.

activation unit

the combination of complement (C4, C2 and C3) that binds to the antigen-antibody complex in the initial reaction step in the classical pathway of complement activation. See also complement.

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activation

Hematology See Plasminogen activation Immunology Lymphocyte activation, see there. See Complement activation, Macrophage activation Neurology The stimulation of a nerve to a level high enough to kick over its action potential.

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Patient discussion about activation analysis.

Q. My son who is 4yrs old is so hyper-active. How do I find out if my son has ADHD or ADD? My son who is 4yrs old is so hyper-active that he climbs on everything and jumps off everything to. I cannot prevent that. I have also punished him. He cries for a split moment and then he just goes back to doing the same thing. I've tried every type of punishment that I could think of. I'm afraid of him. What can I do? How do I find out if my son has ADHD or ADD?

A. I agree complete physical and psycho analysis to rule out any underlying cause. But young children often act out characters; you could ask him why he's doing this and give plenty of proper oportunities to do so. Example when he climbs on and jumps off the furniture ask him what he is doing. He may be pretending to be something or someone. If so ask him where "so and So" does their jumping and ask or remind him what the funiture is for. explain how to properly use it have him demonstrate. Example: " What is a chair for or how do we use a chair? (sitting) "Where" (on the seat, child may touch the seat and answer here) "show me how" (child sits on seat of chair). Praise the positive behavior smiling and then suggest that he can play "so an So" somewhere else at another time: for instance if possible take him out to the playground or in a safe area lie a firm suitcase or other boxlike item on its side, cover with a soft quilt and supervise his c

Q. How does drinking a lot of water before an activity helps to avoid dehydration? Question Description It just makes me go to the bathroom more…

A. you need to drink water before,during and after any sports or exercises,because you sweat which causes dehydration.

Q. why do i have problems with my right hip?i am 38 and i've been working out alot since jan of 92.why the hip? i am very physically active.i am 38.not overweight at all.i am 5-9 and a half and i weigh 180-185 lbs.i have problems with my right hip.hard to exactly explain how it does it's thing on me.i got back into practicing karate kicks in 98 after a 7 year hiatus.i ride my bicycle alot and i do dips,pullups,and moderate level weight lifting.i think maybe its the bicycle sprints that i like to incorporate in my bicycling.what do you's think...?

A. i do not get tingling or burning.i never suffered trauma to the hip.
i do not have pain during the night.only if i stood up all of a sudden right on the bed after laying there for hours would it possibly act up.
during my regular waken hours,if i sit for a prolonged period of time and then go to get up too soon or too quick,i will get the pain.it just always feels like i badly pulled something,or it temporarily went out of place.then i cease further movement for around 10 seconds and sort of let it settle back into place and i do this sort of hip rotational thing to help loosen the area and then,i'm usually good for awhile after that.i havent been to a doctor or orthopedic surgeon because i know how many doctors can be and they might try to convince me that i absolutely have to get surgery or i'll be crippled in a few years.i know how docs like to use scare tactics alot of times and do surgeries that the patient didnt really have to get to begin with.i'm leary about docs in general.