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active site |
Also found in: Dictionary/thesaurus, Legal, Financial, Encyclopedia, Wikipedia, Hutchinson | 0.06 sec. |
active site, the place on the surface of an enzyme where its catalytic action occurs. active not passive. active principle the drugs or chemicals in a pharmaceutical preparation that exert an effect pharmacologically; as distinct from the inert fillers, wetting agents and other excipients also often included. active site that region of a protein, usually an enzyme, that binds to another molecule such as the substrate of the enzyme. active transport the movement of ions or molecules assisted by a carrier protein across the cell membranes and epithelial layers, usually against a concentration gradient, resulting directly from the expenditure of metabolic energy. For example, under normal circumstances more potassium ions are present within the cell and more sodium ions extracellularly. The process of maintaining these normal differences in electrolytic composition between the intracellular fluids is active transport. The process differs from simple diffusion or osmosis in that it requires the expenditure of metabolic energy. Patient discussion about active site. 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. Read more or ask a question about active siteHow to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| ? Mentioned in | ? References in periodicals archive | |
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Oseltamivir
resistance caused by a single amino acid substitution from histidine (H)
to tyrosine (Y) at position 274 of the neuraminidase active site has
been reported in persons infected both experimentally and naturally with
influenza A virus subtype H5N1 (1,2). The glyphosate-based
herbicide disrupts aromatase activity and mRNA levels and interacts with
the active site of the purified enzyme, but the effects of glyphosate
are facilitated by the Roundup formulation in microsomes or in cell
culture. Long misperceived in the West as a Conceptualist, Ilya Kabakov is,
rather, an imagist and a fantasist who constructs situations in which
the work's most active site is the viewer's imagination. |
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