| actinin | <chemical> A protein factor that regulates the length of r-actin. It is chemically similar, but immunochemically distinguishable from actin. Chemical name: Actinins, alpha- (12 Dec 1998) |
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| actinism | The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998) |
| actinium | <chemistry> A supposed metal, said by Phipson to be contained in commercial zinc; so called because certain of its compounds are darkened by exposure to light. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998) |