Organic Chemistry

A side chain in organic chemistry and biochemistry which is a part of a molecule that is attached to a core structure. An R group is a generic label for a side chain which can be anything; however, it is typically stable and covalently linked to the adjoining atom. Historically the abbreviations R and R-group, which often refer to side chains, come from the word "radical". ^{[citation needed]} (see also: functional group. Examples contained therein). Organic chemistry is a specific discipline within the subject of chemistry. ... Biochemistry is the study of the chemical processes and transformations in living organisms. ... In chemistry, a molecule is an aggregate of two or more atoms in a definite arrangement held together by chemical bonds [1] [2] [3] [4] [5]. Chemical substances are not infinitely divisible into smaller fractions of the same substance: a molecule is generally considered the smallest particle of a pure... In organic chemistry, functional groups are specific groups of atoms within molecules, that are responsible for the characteristic chemical reactions of those molecules. ...

Music

Sidechain is also a term in music, which describes a synth- or bassline having its volume modulated by a kick drum. It can also be achieved by triggering a compressor on the kick drum. Source: http://euroadrenaline.com/forum/showthread.php?t=89472