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dopa

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dopa

 [do´pah]
a compound produced by oxidation of tyrosine by tyrosinase; it is the precursor of dopamine and an intermediate product in the biosynthesis of norepinephrine, epinephrine, and melanin. The naturally occurring form is l-dopa (see levodopa), and is used to treat parkinson's disease and other forms of parkinsonism.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

do·pa

, DOPADopa (dō'pă),
An intermediate in the catabolism of l-phenylalanine and l-tyrosine, and in the biosynthesis of norepinephrine, epinephrine, and melanin; the l form, levodopa, is biologically active. See: dopa reaction.
Synonym(s): 3, 4-dihydroxyphenylalanine
Farlex Partner Medical Dictionary © Farlex 2012

dopa

(dō′pə)
n.
An amino acid, C9H11NO4, that occurs widely in animals and plants. In humans and other mammals, it is formed in the liver from tyrosine and converted to dopamine in the brain.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

do·pa

, DOPA (dō'pă)
An intermediate in the catabolism of l-phenylalanine and l-tyrosine, and in the biosynthesis of norepinephrine, epinephrine, and melanin; the l form, levodopa, is biologically active.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

DOPA (dihydroxy phenylalanine)

a precursor in the biochemical PATHWAY leading to MELANIN formation in animals. DOPA is not metabolized in individuals with ALBINISM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

DOPA

The common name for a natural chemical (3, 4-dihydroxyphenylalanine) made by the body during the process of making melanin.
Mentioned in: Albinism
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

do·pa

, DOPA (dō'pă)
Intermediate in catabolism of l-phenylalanine and l-tyrosine and in biosynthesis of norepinephrine, epinephrine, and melanin.
Medical Dictionary for the Dental Professions © Farlex 2012
Mentioned in
References in periodicals archive
The means and standard deviations of the four DOPA approaches, the diversity-related burnout and immigration-related self-efficacy variables, and the two variables of attitudes toward multiculturalism (general society and school) are presented in Table 3, as well as the correlations among the variables.
The pigmentation system in the epidermal models showed a considerable dynamic and responded with increased melanin production upon UVA and UVB irradiation or upon exposure to DOPA. Both reactions have been well-studied in vivo and could be demonstrated in in vitro models, where comparable effects can be observed (Wolber et al., 2008; Slominski et al., 1988; Duval et al., 2001; Yoon et al., 2003; Bessou et al., 1995).
Isao, Synthesis of L- Dopa from L-tyrosine by Aspergillus oryzae, J.
The difference was only in the total weight loss, where the total weight loss in case of tween-dopa-LDH nanocomposite was 68.7%, compared to 61.3% for precursor of dopa nanocomposite.
All of Messersmith's biomedical materials contain a synthetic form of DOPA.
The presence of DOPA in the cement cells was investigated by using the nitro blue tetrazolium (NBT) redox cycling method (Paz et al., 1991) and Arnow's staining (Arnow, 1937), while the cationic dye methyl green was used to stain polyanionic macromolecules (Gabe, 1968).
In PD patients, SPECT and PET studies have shown a progressive loss of DAT and VMAT2 and reduced dopa decarboxylase activity using [[.sup.18]F]-fluoro-dopa PET (Table 2).
The company has also introduced Mucuna Dopa, a natural supplement version of Mucuna pruriens, which contains high concentrations of levodopa, or 1-dopa.
(2) The body methylates dopamine, dopa, 5-hydroxytryptophan, tyrosine, and other biochemicals as a temporary measure to prevent tissue damage.
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