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Activation

Activation

(Science: radiobiology) activation occurs when a particle interacts with an atomic nucleus, shifting the nucleus into an unstable state, and causing it to become radioactive.

in fusion research, where deuterium-tritium is a common fuel mixture, the neutron released when (D _ T) combine to form (4He _ n) can activate the reactor structure. In this case the 4He is inert, the neutron sticks to another nucleus, and the neutron _ nucleus reaction creates an actvation product. Sometimes called radioactivation.

See: activation product, activation analysis.


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Hope you guys can answer this.

... equilibrium position (that is, K) of a reaction.?not sure i think this one, they do affect equilibrium, make sure what K is (c) Enzymes reduce the activation energy (EA) of a reaction. (d) Enzymes are found in all types of biological cells. (e) None of the above.

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by Leela
Wed Aug 26, 2009 4:42 pm
 
Forum: Cell Biology
Topic: Hope you guys can answer this.
Replies: 2
Views: 78

cortisol and B/T-cells

Hi there, I read that stress increases cortisol production and this in turn it inhibits B and T cell activation in vitro. B/T-cells produce antibodies don't they so how is it that has any sort of affect on wound healing? I looked at a study where IL-1a was decreased in those ...

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by biology_06er
Tue Aug 25, 2009 12:35 am
 
Forum: General Discussion
Topic: cortisol and B/T-cells
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Views: 35

Hope you guys can answer this.

... change in free energy (G) of a reaction. (b) Enzymes do not affect the equilibrium position (that is, K) of a reaction. (c) Enzymes reduce the activation energy (EA) of a reaction. (d) Enzymes are found in all types of biological cells. (e) None of the above. thanks

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by cpu2007
Sun Aug 23, 2009 1:14 pm
 
Forum: Cell Biology
Topic: Hope you guys can answer this.
Replies: 2
Views: 78

Cell biology

How CB1 Receptor activation will lead to GABA inhibition? and what is the relation between GABA and Melanin concentrating hormone?

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by ankitakhemka
Sun Aug 09, 2009 7:44 am
 
Forum: Cell Biology
Topic: Cell biology
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Stomach bloating and weight gain

... that is in the stomach. But you got me thinking about pepsinogen and how it needs a pH of 3.5 for optimal activity, and at least a pH of 5 for activation. Vegans are known to have a basic pH constitution, and I wonder if my stomach pH is not optimal. Would explain the orange juice cravings ...

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by kolean
Thu Jul 23, 2009 2:57 pm
 
Forum: Physiology
Topic: Stomach bloating and weight gain
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