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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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achondrite

Overview page. Subjects: astronomy and cosmology.

Rare stony meteorite lacking chondrules and with low nickel-iron content. It is more coarsely crystalline than a chondrite. Basaltic achondrites resemble terrestrial lavas.

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achondroplasia

Overview page. Subjects: medicine and health — chemistry.

A form of dwarfism (chondrodystrophia fetalis) in which there is a failure of endochondral ossification caused by an autosomal dominant mutation in the gene for the fibroblast growth factor...

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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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achromatic

Overview page. Subjects: psychology.

1 Without hue, or represented in black, white, and grey. An achromatic colour, also called a neutral grey or neutral colour, is a mixture of black and white without any chroma...

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AChE

Overview page. Subjects: chemistry.

abbr. for acetyl cholinesterase.

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achromatic interval

Overview page. Subjects: psychology.

For light of a particular hue, the range of light intensities from its absolute threshold to the lowest intensity at which its hue can be detected; analogously, for a pure tone of a...

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achromatic line

Overview page. Subjects: earth sciences and geography.

In the three-dimensional graph which plots quantities of the three additive primary colours contributing to pixels against each other, the line which runs at 45° to the axes. Pixels which...

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achromatism

Overview page. Subjects: astronomy and cosmology.

Freedom from false colour (chromatic aberration) in an optical system. In reality, no optical system containing lenses can ever be completely free from false colour, but the aim is to...

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achromatopsia

Overview page. Subjects: psychology — medicine and health.

n. the inability to differentiate different shades of colour. Such complete colour blindness is very rare and is usually associated with poor visual acuity, nystagmus, and...

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