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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 51 for “"Pyridoxal"”.
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X-ray structural investigations of bromo-oxoditerpenoids and the nickel (II) chelate of a pyridoxal-amino acid intermediate
The crystal structure of bis-(pyridoxylidene-L-valine)nickel(II) hydrate (referred to as nickel(II) pyridoxylidene L-valine) has been determined but the difficulty in detecting small deviations from body-centred symmetry, and in locating all solvent molecules, has precluded an accurate analysis. …
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Studies on the active site modification of pyridoxal and flavin dependent enzymes with acetylenic and olefinic substrate analogues.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1977
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Influence of vitamin B-6 intake on vitamin B-6 status of lactating women and on the vitamin content of their milk: enzymatic, microbiological, and HPLC techniques
… had inadequate vitamin B-6 status. Plasma pyridoxal 5-phosphate values were significantly higher for subjects in the supplemented than in the nonsupplemented group. Pyridoxal, pyridoxamine, pyridoxine, and total vitamin B-6 concentrations in milk were higher, sometimes significantly, in the …
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Palladium and platinum complexes of vitamin Bâ
… complexes of pyridoxamine, pyridoxine and pyridoxal have been prepared. The structures of the complexes PtCI2PM.H20, trans-PdC12 (PN)2 and [PLH+ ]2[PtC16] 2- ,H20 have been determined by use of single crystal x-ray studies. The compounds PdC12PH, trans-PdC12 (PN) 2 , cis-PdCI2 (PN)2 and cis …
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ΑΠΟΜΟΝΩΣΗ ΚΑΙ ΚΑΘΑΡΙΣΜΟΣ ΤΟΥ ΕΝΖΥΜΟΥ L-DOPA ΑΠΟΚΑΡΒΟΞΥΛΑΣΗ ΑΠΟ ΤΙΣ ΛΕΥΚΕΣ ΝΥΜΦΕΣ ΤΟΥ ΕΝΤΟΜΟΥ CERATITIS CAPITATA ΚΑΙ ΑΠΟ ΑΝΘΡΩΠΙΝΟ ΝΕΦΡΙΚΟ ΙΣΤΟ. ΣΥΓΚΡ...
L-DOPA DECARBOXYLASE IS A PYRIDOXAL PHOSPHATE-DEPENDENT ENZYME CATALYZING THE DECARBOXYLATION OF CERTAIN AROMATIC AMINO ACIDS TO THEIR RESPECTIVE AMINES. SINCE DOPAMINE IS INVOLVED IN MANY IMPORTANT METABOLIC PROCESSES PLAYING A CENTRAL ROLE IN THE PATHOGENESIS OF CERTAIN NEUROLOGICAL DISORDERS AND …
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Liquid chromatographic separation and quantitation of B-6 vitamers in rat liver, kidney, and brain tissues
… detector was used to separate the B-6 vitamers pyridoxal (PL), pyridoxine CPN), and pyridoxamine (PM) as well as the internal standard deoxypyridoxine. An extraction procedure, compatible with the HPLC system, was developed to isolate the B-6 vitamers from rat livers, kidneys, and brains. PL …
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Synthesis and applications of aminated biopolymers
… an amination strategy for the immobilisation of pyridoxal and pyridoxal 5'-phosphate (PLP) for application in non-enzymatic deamination of L-phenylalanine to phenylpyruvate. An ionic complex between PLP and Q188 was formed and successfully utilised to convert L- phenylalanine into phenylpyruvate, …
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Separation and quantitation of the seven forms of vitamin B-6 in plasma and 4-pyridoxic acid in urine of adolescent girls by reverse phase high performance liquid chromatography
… evaluation. HPLC-derived plasma B-6 vitamer [pyridoxal phosphate (PLP), pyridoxine phosphate (PNP), pyridoxamine phosphate (PMP), pyridoxal (PL), pyridoxine (PN), and pyridoxamine (PM)] and 4-pyridoxic acid (4-PA) concentrations and urinary 4-PA levels of 28 white adolescent females, 12-15 …
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Bioanalytical methods for studies of homocysteine and novel cardiovascular disease indicators
… for in vivo Hcy clearance based on spontaneous pyridoxal tetrahydrothiazine (PT) formation from Hcy and pyridoxal. The validity of PT-assisted Hcy clearance was further evaluated by use of capillary electrophoretic methods, which allowed rapid monitoring of protein oligomerization in PT-protein …
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Vitamin B6 Decreases Proliferation and DNA Synthesis in Human Mammary Carcinoma Cell Lines In Vitro
… for its role as a modulator of steroid hormones. Pyridoxal phosphate (PLP), the active form of Vitamin B6, may interfere with the action of the estrogen receptor (ER) by blocking the hormone-binding and/or DNA-binding site of the ER. The objective of this study was to examine the effects of …
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ΕΠΙΔΡΑΣΙΣ L-ΘΡΥΠΤΟΦΑΝΗΣ ΕΠΙ ΕΝΖΥΜΩΝ ΤΟΥ ΜΕΤΑΒΟΛΙΣΜΟΥ ΤΗΣ ΑΛΑΝΙΝΗΣ, ΓΛΟΥΤΑΜΙΝΙΚΟΥ ΚΑΙ ΑΣΠΑΡΤΙΚΟΥ ΗΠΑΤΟΣ ΕΠΙΜΥΟΣ
… 3) THE XANTHURENATE IS A STRONG INHIBITOR BOTH PYRIDOXAL AND PYRIDOXAMINE FORM OF GPT. 4) THE ANTHRANILATE IS A STRONG INHIBITOR OF GPT. 5) L- THRYPTOPHANE INHIBITS LIVER GLUCONEOGENESIS BY THE INHIBITIONIN THE SPECIFIC ACTIVITIES OF GPT AND GOT. 6) GLUCONEOGENESIS AND GPT GOT …
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Snapshots of radical enzyme catalysis : the crystal structures of biotin synthase and lysine 5,6-aminomutase
… structure of lysine-5,6-aminomutase implicates pyridoxal phosphate in a novel role, acting as a lock to prevent the formation of aberrant radicals in the absence of substrate.
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Structural insights into conformationally-gated reactions catalyzed by thiamine pyrophosphate-dependent enzymes
… of isoprenoids, vitamin B1, and vitamin B6 (pyridoxal phosphate, PLP) in bacterial pathogens. Human adapts different pathways to access those essential metabolites; thus, selective inhibition of DXP synthase has been considered to be a possible approach for antibiotic therapies.
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Dietary vitamin B6 supplementation promotes the growth of 7,12-dimethylbenz(a)anthracene-induced mammary carcinoma in Sprague Dawley rats
… resulted in increased fibrosarcoma pyridoxal phosphate (PLP) concentrations and a significant inverse relationship between tumor PLP concentration and tumor volume in mice. This suggests that, in contrast to data reported for normal cells, tumor cells are capable of accumulating …
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Synthesis of 6-Deoxy-6-Amino Chitosan and applications thereof
… catalyst support was extended to a biomimetic pyridoxal 5′-phosphate (PLP) based support. Immobilised pyridoxal 5′-phosphate (PLP) was investigated as an enzyme mimic in the deamination of L-phenylalanine to phenylpyruvate.
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Characterization and site-directed mutagenesis of NifU from Azotobacter vinelandii
… that the nifS gene product (Nifs) is a pyridoxal-phosphate containing enzyme capable of catalyzing the desulfurization of L-cysteine and can provide the inorganic sulfide necessary for in vitro metallocluster biosynthesis of the Fe protein (Zheng, et al., 1993: Zheng, et al., 1994).
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Vitamin B-6 status of a group of female adolescents: E-ALAT, microbiological, and HPLC methods
… vitamin B-6 levels as the criterion. The plasma pyridoxal, pyridoxine, pyridoxamine and total B-6 vitamer concentrations of subjects having inadequate E-ALAT values were lower, generally significantly, than those of girls with adequate levels. In the subjects with adequate status, the vitamer …
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