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The Encyclopedia of Underwater Life

Edited by Andrew Campbell and John Dawes.

January 2005; published online January 2007.

Book. Subjects: zoology and animal sciences. 51 pages.157385 words.

A breathtaking insight into underwater life, this Encyclopedia offers unrivalled coverage of the fish and aquatic invertebrates that inhabit our rivers, lakes, and oceans. It describes in...

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A Dictionary of Biology

Elizabeth Martin and Robert Hine.

January 2008; published online January 2008.

Book. Subjects: biological sciences. 5492 pages.312703 words.

Fully revised and updated, the sixth edition of this dictionary provides comprehensive coverage of biology, biophysics, and biochemistry, as well as key terms from medicine and...

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Acholeplasmataceae

Overview page. Subjects: plant sciences and forestry.

(order Mycoplasmatales)

A family of Gram-negative, chemo-organotrophic bacteria that do not require the presence of sterols (see steroid) for growth. Cells are spherical,...

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Achras

Overview page. Subjects: plant sciences and forestry.

(family Sapotaceae)

A genus of plants that includes A. zapota (Manilkara zapota) which yields the delicious fruit chiku, or sapodilla plum, for which it is now widely cultivated,...

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acicular

Overview page. Subjects: biological sciences.

Pointed or needle-shaped.

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acid-base balance

Overview page. Subjects: medicine and health — biological sciences.

The regulation of the concentrations of acids and bases in blood and other body fluids so that the pH remains within a physiologically acceptable range (see pH scale). This is achieved by...

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acid fuchsin

Overview page. Subjects: genetics and genomics.

An acidic dye used in cytochemistry.

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acid growth theory

Overview page. Subjects: biological sciences — chemistry.

A theory, originally proposed in 1970 by R. Cleland, A. Hager, and co-workers, that describes how auxins stimulate cell expansion in certain plant tissues, notably in coleoptiles of cereals...

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acidic dye

Overview page. Subjects: plant sciences and forestry — ecology and conservation.

A dye which consists of an organic anion that combines with and stains positively charged macromolecules. It is used particularly for staining cytoplasm. Compare basic dye.

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acidic grassland

Overview page. Subjects: plant sciences and forestry — ecology and conservation.

A grassland that occurs on acid soil: it is usually derived from former woodland as a consequence of centuries of grazing and, to a lesser extent, burning. In Britain and much of...

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