General

General

General nature or nature terms.

Industry: Natural environment

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General

macrophages

Biology; General

A type of white blood cell derived from monocytes that engulf invading antigenic molecules, viruses, and microorganisms and then display fragments of the antigen to activate helper T cells; ...

marsupials

Biology; General

Pouched mammals. The young develop internally, but are born while in an embryonic state and remain in a pouch on the mother's abdomen until development is complete; this group includes kangaroos, ...

methionine

Biology; General

The amino acid coded for by the initiation codon; all polypeptides begin with methionine, although post-translational reactions may remove it.

mass extinction

Biology; General

A time during which extinction rates are generally accelerated so that more than 50% of all species then living become extinct; results in a marked decrease in the diversity of organisms. Mass ...

micelles

Biology; General

Structures formed when bile salts surround digested fats in order to enable the water-insoluble fats to be absorbed by the epithelial cells lining the small intestine.

mast cells

Biology; General

Cells that synthesize and release histamine, as during an allergic response; found most often in connective tissue surrounding blood vessels.

microevolution

Biology; General

A small-scale evolutionary event such as the formation of a species from a preexisting one or the divergence of reproductively isolated populations into new species.