biotin

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biotin

 [bi´o-tin]
a sulfur-containing member of the vitamin B complex that plays an essential role in gluconeogenesis and the synthesis of fatty acids. Food sources include liver, egg yolk, soy flour, cereals, and yeast. For recommended daily intake, see Section 4 of the appendices. See also vitamin.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

bi·o·tin

(bī'ō-tin),
The d-isomer component of the vitamin B2 complex occurring in or required by most organisms and inactivated by avidin; participates in biologic carboxylations. It is a small molecule with a high affinity for avidin that can be readily coupled to a previously labeled antibody to allow visualization by enzymatic or histochemical means.
See also: avidin.
Farlex Partner Medical Dictionary © Farlex 2012

biotin

(bī′ə-tĭn)
n.
A vitamin, C10H16N2O3S, that is a component of the vitamin B complex and is a cofactor in many enzyme systems. It is found in large quantities in liver, egg yolk, milk, and yeast and is used in many biotechnology applications.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

biotin

A water-soluble B vitamin.

Biochemistry
Biotin is the d-isomer of vitamin-B2 complex, which is a prosthetic group for carboxylase enzymes and important in fatty acid biosynthesis and catabolism. It is present in and essential for most animals, as it participates in carboxylation; daily requirements are in the mg range; biotin deficiency is rare.
 
Lab medicine
Biotin is widely used as a covalent label for macromolecules which are detected by high-affinity binding of labelled avidin or streptavidin.

Molecular biology
Biotin can be incorporated into dUTP and used as a non-radioactive label for a DNA probe. It is used to label nucleic acids and proteins that may be subsequently detected by avidin or streptavidin linked to a fluorescent or enzymatic reporter molecule.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

bi·o·tin

(bī'ō-tin)
The d-isomer component of the vitamin B2 complex occurring in or required by most organisms and inactivated by avidin; participates in biologic carboxylations.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

biotin

A water-soluble B vitamin concerned in the metabolism of fats and carbohydrates. Deficiency causes DERMATITIS, muscle pain, loss of appetite and ANAEMIA.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

biotin

a water-soluble vitamin of the B-COMPLEX present in many foods, including yeast, liver and fresh vegetables. Biotin acts as a COENZYME in amino acid and lipid METABOLISM. A deficiency (rare in humans) of biotin causes dermatitis and intestinal problems.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

bi·o·tin

(bī'ō-tin)
The d-isomer component of the vitamin B2 complex occurring in or required by most organisms and inactivated by avidin.
See also: avidin
Medical Dictionary for the Dental Professions © Farlex 2012