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HAAR

Local term for a wet sea-fog advancing in sum

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HAAS EFFECT

Phenomenon associated with a long-de

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HABENULA

A strap-like structure; in particular, a nerve centre of the diencephalon.

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HABER PROCESS

Currently the most important process of fixing nitrogen, in which the nitrogen is made to combine with hydrogen under influence of high temperatures 400 -500 C, high pressure 2 x 107 N m 2, and catalyst of finely-divided iron from iron III oxides, in large continuous enclaves. Many variants operate at different pressures according to the catalyst. The product ammonia may be dissolved in water or condensed, and unreacted gases recycled.

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HABIT

As a general term, and in learning theory, refers to learned patterns of behaviour which are very consistent and predictable in particular situations. Its specific usage varies in different branches of psychology, eg referring to compulsive behaviour in clinical psychology, to a particular cognitive style in cognitive psychology,

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HABIT SPASM

A repeated, rapidly performed, in

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HABITAT

The normal locality inhabited by a plant or animal, particularly in relation to the effect of its environmental factors,

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HABITUATED CULTURE

A tissue culture that has devel

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HABITUATION

An aspect of learning in which there is a decrease in responsiveness as a consequence of repeated stimulation; the habituated response reappears if the stimulus is withheld for a long time.

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HACCP

Abbrev for hazard analysis and critical control point. See hazard analysis,

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