Global ETD Search
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 67 for “"L-cysteine"”.
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Impact of N-Acetyl-L-Cysteine on the Pathology of Experimental Parkinson’s Disease in Vivo
… molecules, the antioxidant thiol N-acetyl-L-cysteine (NAC) and the steroid neuromodulator dehyroepiandrosterone sulfate (DHEAS), in experimental models of Parkinson’s disease in vivo. To accomplish this goal, we first established multiple animal models of Parkinson’s disease that mimicked …
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Color and Structural Modifications of Alkaline Extracted Sunflower Protein Concentrates and Isolates Using L-Cysteine and Glutathione
… lysine. Thiol-containing dough conditioners: L-cysteine hydrochloride and reduced glutathione (GSH) were investigated as an alternative de-greening strategy to de-phenolization. Varying pH from 7 to 11 and concentration of 0.82 to 5.6 mM were randomly assigned by Response Surface Methodology …
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L-Cysteine Effects on Chlorogenic Acid Quinone-Amino Acid Induced Greening and Browning: Mechanism and Effects on Antioxidant Capacity
… where CGA containing ingredients are used. Cysteine was studied as an amino acid anti-greening strategy, because cysteine-CGA conjugates are colorless. Buffered CGA: lysine: cysteine solutions at pH 8.0 and 9.0 were prepared and incubated for a maximum of 48 h at ambient temperature. Color …
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Continuous hydride generation in the presence of L- cysteine for the determination of arsenic, bismuth, antimony and tin in steels by inductively coupled plasma atomic emission spectrometry
Arsenic, bismuth, germanium, antimony and tin were simultaneously determined by continuous hydride generation and inductively coupled plasma-atomic emission spectrometry . I Hydrides were introduced into four different types of gas-liquid separators. Two of the gas-liquid separators were available …
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Regulation of cataractogenesis in cultured bovine lenses by hydrogen sulfide donors
… a leading cause of blindness. However, L-cysteine reportedly mitigates cataractogenesis, in vitro and in vivo. Here, we sought to standardize a new method for screening cataractogenesis and assess the effect of hydrogen sulfide (H2S) on cataractogenesis. Bovine lenses were cultured in DMEM …
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Inhibition of excitatory neurotransmitter activity by hydrogen sulfide in bovine retina, in vitro
… of different categories of H2S donor drugs, L-cysteine, a substrate for H2S biosynthesis; N-acetyl-cysteine (NAC), a precursor to L-cysteine and GYY 4137, a slow-releasing H2S donor on potassium (K+; 50 mM)-induced glutamate release (measured as [3H]D-aspartate) in bovine isolated retina using …
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Arsenic speciation by ion-exchange chromatography with on- line determination by hydride generation: electronic modification of the D.C. plasma by photon counting
A method using L-cysteine for the determination of arsenous acid (As(III)), arsenic acid (As(V)), monomethylarsonic acid (MMAA), and dimethylarsinic acid (DMAA) by hydride generation was demonstrated. The instrument used was a d.c. plasma atomic emission spectrometer (OCP-AES). Complete recovery …
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Part1. Relative antioxidant efficiency of synthetic and natural compounds; Part 2. Synthesis, characterization of cysteine oligopeptides and assessment of their antioxidant activity
… - mass spectrometric (LC-MS) characterization of cysteine containing hydrophobic oligopeptides. Two types of oligopeptides L-cysteine homo-oligopeptides and L-cysteine, L-methionine hetero-oligopeptides were synthesized through papain catalyzed oligomerization reactions."--Abstract, page iii.
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Complex Formation of Pb(II) with Cysteine, Penicillamine and N-acetylcysteine
… and thiol-containing ligands D-penicillamine, L- cysteine and N-acetyl-L-cysteine were investigated in this study. The complexes formed were studied by 207Pb, 13C, 1H NMR, UV-Vis, ESI-MS, and X-ray absorption spectroscopy. The results of the study provide spectroscopic finger prints for Pb(II) …
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Characterization of bio-hybrid interfaces under ambient conditions
… with deionized water (H2O) and neutral L-cysteine (C3H7NO2S) molecules. Atomic force microscopy (AFM), low energy electron diffraction (LEED), and X-ray photoelectron spectroscopy (XPS) in ultra-high vacuum (UHV) and near-ambient-pressure (NAP) conditions were used for this investigation. …
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Factors affecting copper utilization
… dietary effects of physiologic doses of L-cysteine (4000 mg/kg diet) or L-ascorbate (1000 mg/kg diet).
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Effect of Hydrogen Sulfide Donors on Sympathetic Neurotransmission and Intraocular Pressure of the Eye
… of two H2S donors, GYY 4137 and ACS67 and L-cysteine, the substrate for endogenous H2S production on electrically evoked [3H]NE release in isolated bovine iris-ciliary bodies (ICB) in vitro was determined. GYY 4137 (1-30 μM), ACS67 (10 nM-10 μM) as well as L-cysteine (10 nM-10μM) attenuated …
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Genes involved in thiol release from cysteine and glutathione conjugates by Saccharomyces cerevisiae during wine fermentation
… it was demonstrated that Irc7F cleaves L-cysteine in vitro (enzymatic assay with purified Irc7Fp) and in vivo (growth in L-cysteine in fermentative-like conditions), suggesting that it plays a biological role in yeast sulfur metabolism. Moreover, yeast selected for growth on L-cysteine …
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Rhenium Carbido Carbonyl Cluster Complexes With Group 12 Metal Centers
… The reaction of [PPh4]2[Re 7C(CO)21HgCl] with L-cysteine in aqueous acetone formed the complex [PPh4]2[Re7C(CO)21HgSCH 2CH(NH3)CO2]. In order to explore further reactions in aqueous solution, work was carried out with [Na]2[Re7C(CO) 21HgCl]. Preliminary work indicates that this complex has …
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Cysteine(2-), alkyl, and siloxide complexes of ruthenium(VI) and iron(III)
Transition metal-cysteine complexes are reviewed in Chapter 1. Compounds for which X-ray crystal structures have been determined are considered first followed by those for which only spectroscopic evidence exists. The synthesis and characterization of several trans-dioxoruthenium(VI) species …
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The development of S-glycosylcysteine derivatives for use in glycan-binding assays
… development of a synthetic route towards novel cysteine-based glycan-binding probes, for incorporation into glycoarrays and or similar applications used in assays of glycan-recognition phenomena. The need to systematically characterize the glycome and decipher the range of glycosylation patterns …
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Synthesis and evaluation of novel quorum sensing inhibitors
… attempt at coupling a bromofuranone with L-cysteine. Nevertheless, we were able to successfully couple the N-Boc-protected-methyl ester of L-cysteine with a tribromofuranone. The biological activity of the novel compounds generated throughout this project is detailed in Chapter Five. The …
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Mechanistic Studies of Flavin-Dependent Monooxygenases Involved in Bacterial Defense and Plant Metabolism
… and sulfide-containing compounds, particularly L-cysteine derivatives. Additionally, we show that S-allyl-L-cysteine is the preferred substrate and propose TvMAS1 to primarily have a physiological role in allicin, not marasmin biosynthesis. Lastly, we characterized the auxin-producing FMO YUC10 …
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Protein Specificity Dictates Proper Sulfur Transfer in the Biosynthesis of Thio-cofactors in Bacteria
… molecules is predominantly originated from L-cysteine through activation by cysteine desulfurases and is relayed to specific pathways involving the synthesis of thio-cofactors. In this dissertation, we reviewed recent methods for detection and quantification of bacterial thio-nucleosides used …
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Development of novel nutrapharmaceuticals combining the anti-oxidant and anti-inflammatory properties of n-3 fatty acids with a nitric oxide donor: a potential new preventative strategy for heart disease.
… cysteamine (Compound 1), N-decanoyl L-cysteine ethyl ester (compound 3)) and peptide coupling based reactions, and full characterisation has been achieved. The nitration stage of synthesis was achieved using tert-butyl nitrite and 'fuming' NO as the nitrating agents. Successful …
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