Biography Category
a protein abundantly present in many cells, especially muscle cells, that significantly contributes to the cell’s structure and motility. Actin can ...
(ä´´ch r ä´l ) (KEY) , city (1991 pop. 46,199), E Sicily, Italy. Beautifully situated on a volcanic plateau near Mt. Etna and near the Ionian Sea...
the representation of a usually fictional character on stage or in films. At its highest levels of accomplishment acting involves the employment of te...
in chemistry, minimum energy needed to cause a chemical reaction. A chemical reaction between two substances occurs only when an atom, ion, or molecul...
town (1990 pop. 17,872), Middlesex co., E Mass., NW of Boston; settled c.1680, inc. 1735. Among its manufactures are electrical machinery, chemicals, ...
( k´´t n m ´s n) (KEY) , any one of a group of antibiotics produced by bacteria of the genus Streptomyces. Actinomycin was the first antibiotic rep...