سبتمبر 15th, 2018

 

ABC transporter

ABC transporter a membrane transport protein having the ABC molecular domain, named after ATP-binding cassette, characteristic of all members of a large superfamily of membrane transport proteins that hydrolyse ATP and transfer a diverse array of small molecules across membranes.

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ABC model

ABC model a model for specification of floral organs especially in Arabidopsis thaliana. It views the floral primordium as comprising four whorls whose developmental fate is determined by the concentric and combinatorial activity of three classes of gene, denoted A, B, and C, which encode transcription factors. Class A determines the fate of whorls 1 and 2 (sepals and petals, respectively) and requires the APETALA2 gene (AP2); class…

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Abbe refractometer

Abbe refractometer a refractometer in which the critical angle for total reflection at the interface of a film of liquid between two similar glass prisms is used in determining the refractive index of the liquid.

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Aarskog–Scott syndrome

Aarskog–Scott syndrome or Aarskog syndrome or faciogenital dysplasia an extremely rare genetically heterogeneous developmental disorder in which individuals have widely spaced eyes, anteverted nostrils, a broad upper lip and a ‘saddlebag’ or ‘shawl scrotum’. The X-linked form has been ascribed to mutations in the FGD1 gene.

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AAA protease

abbreviation for ATPase associated with varied activities; any member of a family of conserved ATP-dependent proteases that mediate degradation of nonintegrated membrane proteins in bacteria, mitochondria, and chloroplasts. They form large complexes composed of identical or homologous subunits. Each subunit contains two transmembrane segments, an ATP-binding omain, and a metal-dependent catalytic domain. Mitochondria contain a matrix-facing AAA protease (m-AAA protease) and an intermembrane space-facing AAA protease (i-AAA protease). The m-AAA protease…

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ABCR

ABCR abbreviation for ATP-binding cassette transporter retina; other name: rim protein. A protein found in the disc membrane of the outer segment of photoreceptor cells of the retina. It consists of 2273 amino acids, and is presumed to function in the transport of retinoids. Mutations in the ABCR gene, at 1p21-p23, are associated with Stargardt and age-related macular dystrophies.

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Calcimycin

A23187 or calcimycin a toxic and weakly antibiotic substance isolated from cultures of Streptomyces chartreusensis. It is a lipophilic 523 Da monocarboxylic acid of complex structure, two molecules of which form stable lipid-soluble complexes at pH 7.4 with one atom of certain divalent metal cations, especially Mn2+, Ca2+, and Mg2+; monovalent cations are bound only weakly. It also forms lipid-soluble complexes with certain amino acids. It is used…

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