Metabolites
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In this study, the antidengue virus activity of the ethanol extract from the leaves and twigs of E. cyathophora on four virus serotypes DENV1-DENV4 was examined. The result showed that the ethanol extract displayed antidengue activity on DENV1-4 with PRNT50 values of 15.625-62.5 µg/mL. This extract was fractionated to the n-hexane and ethyl acetate fractions.
7p dianmotminh02 03-05-2024 5 2 Download
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Flavonoids are a diverse group of natural compounds extensively studied in various research articles. They are widely distributed in the plant kingdom and exhibit various biological activities, including antioxidant, antiinflammatory, anticancer, antiviral, and antimicrobial effects. The genus Knema Lour., which contains many species in Southeast Asia, has been traditionally used to treat various ailments. The current review aims to provide a comprehensive update on the isolation of flavonoids and other secondary metabolites from the genus Knema Lour. between 1978 and 2022.
15p dianmotminh02 03-05-2024 5 2 Download
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The focus of this thesis was to study the chemotaxonomic relationship of selected southern Australian marine brown algae of the genera Cystophora and Sargassum. Consequently, this resulted in the isolation and structure elucidation of six new terpenoids from two southern Australian marine brown algae Cystophora moniliformis and Sargassum fallax together with 10 previously reported natural products. As a result of the re-isolation of these known secondary metabolites, updated and complete structural characterisation data could be provided for the first time for 7 of these compounds.
132p runthenight07 01-03-2023 6 3 Download
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The thesis investigates the growth promoting effects of plant growth promoting bacteria (PGPB) in chickpea and wheat. Three main topics covered are: 1) Isolating local Plant Growth Promoting Bacteria; 2) Screening and characterization of isolates; 3) Assessment and identification of the selected strains.
107p runthenight04 02-02-2023 9 4 Download
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The significant alterations were observed in SOD, CAT, GST and AChE activity for both oral and contact exposure pathways. In conclusion, cypermethrin modulated the activities of biomarkers of oxidative stress and altered the level of energy metabolites in the bees.
10p thebadguys 15-01-2022 9 0 Download
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Cardiac hypertrophy (CH), leading to cardiac failure is due to chronic metabolic alterations occurring during cellular stress. Besides the already known relationship between oxidative stress and CH, there are implications of reductive stress leading to CH. This study attempted to develop reductive stress-based CH rat model using n-acetyl-L-cysteine (NAC), a glutathione agonist that was compared with typical isoproterenol (ISO) induced CH model.
21p thiencuuchu 27-11-2021 11 1 Download
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Thesis aims: Isolation and screening for Vietnam antimicrobial marine-derived actinobacteria strains. Isolation and structure elucidation of compounds from 2 promising isolated actinobacteria strains. Determination the antimicrobial activities of isolated compounds.
26p extraenglish 24-05-2021 25 3 Download
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The objectives of the thesis: Study on chemical constituents of three Antidesma species including A. acidum, A. ghaesembilla, and A. hainanensis growing in Vietnam; evaluation of biological activities of isolated metabolites to find potential compounds.
27p capheviahe27 23-02-2021 27 4 Download
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In this study, we evaluated chemical responses of K. obovata and S. caseolaris through comparisons of the content of metabolites and element ions in leaves of mangrove plants located under different ecological conditions in the Red River delta. In the low salinity area (Thuy Truong), specific leaf areas of K. obovata and S. caseolaris were much lower while the succulent index was higher compared to those in the high salinity area (Kim Trung).
13p nguaconbaynhay10 20-02-2021 9 2 Download
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Isolation and screening for Vietnam antimicrobial marine-derived actinobacteria strains; isolation and structure elucidation of compounds from 2 promising isolated actinobacteria strains; determination the antimicrobial activities of isolated compounds.
26p capheviahe26 25-01-2021 37 5 Download
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Four non-alkaloidal metabolites: Stemanthrene C, methyl ferulate, methyl 4-hydroxycinnamate and B-sitosterol were isolated from the roots of Stemona cochinchinensis plants which were collected in Savannakhet Province (Laos). Their structures were elucidated by spectroscopic analyses. Stemanthrene C exhibited medium cytotoxic activity against the KB cell line with an IC50 value of 82.03 ug mL−1.
7p tamynhan8 04-11-2020 8 2 Download
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Three fungal metabolites, (1) O-methylsilvaticol, (2) orthosporin and (3) diplosporin were isolated from a rare fungus, Kretzschmaria sandvicensis, collected in Dien Bien, in northwest Vietnam. Their structures were established using a combination of high resolution MS (FT-ICR-MS) and 1H-NMR, 13C-NMR, HSQC and HMBC spectroscopy. They were evaluated for anticancer properties against the KB cell line.
5p tamynhan8 04-11-2020 10 2 Download
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Investigation on the chemical constituents of ethyl acetate extract from leaves of Taxus wallichiana Zucc. (Taxaceae), collected in Ha Giang province, has resulted in the isolation of three metabolites for the first time: sciadopitysin (1), β-sitosterol (2), and isoquercitrin (3). Their structures were determined by spectroscopic methods.
6p koxih_kothogmih5 04-09-2020 25 2 Download
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Obtaining of secondary metabolites from marine fungi isolated in the Central Vietnam and identifying some biological activities (antibiotimicrobial, cytotoxic, antioxidant, neuroprotective activities) of obtained individual compounds.
27p trinhthamhodang7 31-08-2020 37 2 Download
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An analytical procedure for the analysis of carotenoids in marine sediments rich in organic matter has been developed. Analysis of these compounds is difficult; the application of methods used by other authors required optimization for the samples studied here.
14p tocectocec 25-05-2020 23 1 Download
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Helicteres hirsuta Lour., particularly its stems and leaves have been used in Vietnamese traditional medicine to cure furuncles, dysentery, measles and flu. In this study, we examined biological activities of 5 fractions from methanol extract of H. hirsuta roots. The results showed that ethyl acetate fraction has the highest content of phenolic and flavonoid compounds (220.9 ± 15.67 mg GAE, gallic acid equivalents/g dry weight and 23.03 ± 0.97 mg QE, quercetin equivalents/g dry weight, respectively).
7p shiwo_ding7 05-06-2019 41 2 Download
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Polyphosphate polymer (polyP) plays a very important role in every living cell. Synthesis of this linear polymer of phosphate (Pi) residues is catalyzed by the polyphosphate kinase (PPK) enzyme.
16p nutifooddau 27-01-2019 15 2 Download
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Modelling of the fluxes in central metabolism can be performed by combining labelling experiments with metabolite balancing. Using this approach, multiple samples from a cultivation of Saccharomyces cerevisiae in metabolic and isotopic steady state were analysed, and the metabolic fluxes in central metabolism were estimated. In the various samples, the estimates of the central metabolic pathways, the tricarboxylic acid cycle, the oxidative pentose phosphate pathway and the anaplerotic pathway, showed an unprecedented reproducibility....
6p system191 01-06-2013 38 1 Download
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Glyoxal is a key compound involved in glyoxal oxidase (GLOX)-dependent production of glyoxylate, oxalate and H2O2 by lignin-degrading basidiomycetes. In this paper, we report that glyoxal was produced from a metabolite of ligninolytic fungi, linoleic acid, by manganese peroxidase (MnP)-dependent lipid peroxidation. In the absence of the parent substrate of linoleic acid, the dialdehyde was oxidized by MnP and Mn(III) chelate to start free radical reactions with emission of chemiluminescence at 700– 710 nm. ...
9p system191 01-06-2013 68 6 Download
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Metabolite channelling, the process in which consecutive enzymes have confined substrate transfer in metabolic pathways, has been proposed as a biochemical mechanism that has evolved because it enhances catalytic rates and protects unstable intermediates. Results from experiments on the synthesis of radioactive urea [Cheung, C., Cohen, N.S. & Raijman, L (1989)J. Biol. Chem.264, 4038–4044] have been interpreted as implying channelling of arginine between argininosuccinate lyase and arginase in permeabi-lized hepatocytes. ...
9p tumor12 20-04-2013 34 1 Download