Structure determination

Phytochemical study of Knema saxatilis stems led to the isolation of six known compounds. Their chemical structures were determined as 8-hydroxy eriodictyol (1), (2S)-7-hydroxy-3′,4′-methylenedioxideflavan (2), sitostenone (3), protocatechuic acid (4), 4-hydroxybenzoic acid (5) and vanillin (6) using NMR and MS spectral data.

7p viyoko 01-10-2024 1 1   Download

The genus Gymnosporia, belonging to the Celastraceae family, which comprises approximately 116 species globally, with 8 species identified in Vietnam. This work initially describes the extraction, isolation, and structural identification of six triterpenoids from G. chevalieri collected in Vietnam.

8p vihatake 06-01-2025 5 2   Download

Uvaria, a genus within the Annonaceae family, encompasses around 150 species of flowering plants. Uvaria boniana is extensively found throughout Vietnam and is utilized in traditional medicine practices. The aim of this study was to determine the microscopic characteristics and evaluate the antioxidant activity of Uvaria boniana.

6p viharuno 03-01-2025 2 2   Download

Cervical tooth wear is a common oral health issue that often leads to the loss of tooth structure integrity, making the teeth sensitive, prone to plaque buildup, affecting the dental pulp, and causing aesthetic concerns. To determine the prevalence and severity of cervical tooth wear in young individuals aged 18-25 and examine the association between brushing habits and cervical tooth wear.

6p viharuno 03-01-2025 2 2   Download

Is a branch of polymer science dealing with analysis and characterisation of polymers. üThe complication of macromolecular chains, the dispersion in molecular weight, tacticity, crystallinity, orientation, composition of polymers etc. and complex morphological systems ⇒ analysis of polymer ≠ the small organic materials ⇒ Focus on viscoelastic properties, dynamic mechanical testing.

114p buitiendung87 06-01-2011 347 154   Download

Why do FA? To understand the root cause of device failure Allow intelligent corrective actions to be applied Determine where in a process issues exist that affecting product Check for counterfeit materials - My boss/customer said I have too Case Study packaged IC second level Opens

32p vinhtk7ce 06-07-2012 80 4   Download

- Polysaccharides are macromolecules, polymers with a few hundred to a few thousand monosaccharides joined by glycosidic linkages. - Some polysaccharides serve as storage material, hydrolyzed as needed to provide sugar for cells. - Other polysaccharides serve as building material for structures that protect the cell or the whole organism. - The architecture and function of a polysaccharide are determined by its sugar monomers and by the positions of its glycosidic linkages.

118p zingzing09 21-10-2012 56 9   Download

Vietnam has experienced an impressive growth over the last two decades However, reforms so far are insufficient to move Vietnam to a middle income economy. The next several years will determine whether Vietnam will follow the experience of Korea, or the Philippines. Vietnam’s reform have been piecemeal and reactive. Improving Vietnam’s standard of living will require a long term economic strategy. – A set of interrelated policy changes, institutional structures, and rigorous implementation mechanisms....

35p nguyenphuchung111 28-02-2013 45 6   Download

This study aims to analyze the simultaneous relationship between supply chain strategy and profitability. This study will also analyze the effect of capital structure and profitability on firm value based on the supply chain strategy. Furthermore, it will analyze the factors that influence capital structure, profitability and firm value in manufacturing companies in Indonesia.

13p longtimenosee09 08-04-2024 6 0   Download

The thesis "Impact of capital structure on performance of listed material manufacturing enterprises in Vietnam" aims to determine the impact and degree of impact of capital structure on the performance of listed material manufacturing enterprises in Vietnam from 2012-2021.

127p phuong10693 19-06-2023 12 6   Download

The aim of the research was the processing of the vibration signatures from healthy and damaged composite beams acquired with the help of a Scanning Laser Vibrometer (SLV) upon excitation and analysis of the mode shapes acquired for damage detection. The displacement mode shapes acquired were then converted into curvature mode shapes with the help of a Central Difference Approximation method (CDA).

146p runthenight07 01-03-2023 9 3   Download

This research is built upon the determination of the Eigenpairs of one and two dimensional positive differential operators with periodic boundary conditions. The Schrödinger equation was solved for positive operators in both one and two dimensions. Fourier series were used to express the derivatives as the summation of Fourier terms. This led to a novel approach for the calculation of the eigenmodels of a perturbed potential well. The perturbation can be done via an electric field applied to the potential well.

88p runthenight07 01-03-2023 8 3   Download

Studies on nanoparticle-protein interaction have also not been studied. This would give information on ratio influence on the structural alteration of EGCg in EGCg-AuNPs and its functionality in vivo. Herein, the optimisation of EGCg-AuNPs will be determined with a large pool of stoichiometric synthesises of gold and EGCg. These optimised EGCg-AuNPs would then be studied with bovine serum albumin (BSA) for protein interactions, binding and thermodynamics.

177p runthenight07 01-03-2023 12 3   Download

This Master's thesis aims to document the research process into the synthesis of 2D AlPO4 via a liquid metal synthesis pathway. The synthesised 2D AlPO4 will then undergo qualitative and structural analysis, after which it will be characterised via advanced techniques to determine piezoelectric characteristics, as well as the exploration of the ability of the synthesised material to absorb heavy metals.

114p runthenight04 02-02-2023 8 2   Download

This thesis examines the capital structure choice of Australian firms with an emphasis on the impact of market timing and liquidity considering 1438 available firms for the period, 1997 to 2005. The relationship between capital structure and its determinants is the main focus of this thesis, with four empirical analyses. These analyses are all conducted within the Baker and Wurgler (2002) and Hovakimian (2006) models with both pooled ordinary least squares (OLS) and fixed effect panel analysis.

211p runthenight04 02-02-2023 20 2   Download

The aim of this study is to investigate the nature, extent and determinants of risk information disclosed, using the context of corporate reporting in Malaysia. Key management personnel and controlling shareholders are chosen as the two types of players expected to influence corporate risk disclosure decisions. In terms of key management personnel, this study draws on upper echelons theory to develop hypotheses about the effects of demographic and other background influences of the Chief Executive Officer (CEO) and Chair of Audit Committee (CAC) on corporate risk disclosure.

289p runthenight04 02-02-2023 15 2   Download

This study examined the phenomenon of residual protection by suspending the operation of established ICCP systems in two wharves located in southern Victoria and monitoring the effect on the passivity of the steel via electrochemical testing. The results of the study confirm that the steel in selected elements within these structures remained passive once the ICCP system was interrupted. The primary factor in determining which elements remained passive, and the duration of passivity was the amount of charge injected into the element over the life of the ICCP system.

290p runthenight04 02-02-2023 7 3   Download

The aim of this thesis is: To examine and evaluate commercial property market forecast theory and models used in forecasting market performance; to define and analyse downside risk exposure and strategies to manage risks in a real estate environment; to test the accuracy of commercial property market and economic forecasts and to determine whether they capture downside risks; to analyse and discuss the relationship between property forecast errors and economic forecast errors; to explore the current state of the australian commercial property market forecasting practice and its exposure to ...

403p runthenight04 02-02-2023 19 4   Download

The goal of the thesis: Determine the time of harvesting the natural growing Dangshen roots; research on inulin extraction, purification, and characterization of inulin molecular structure in Dangshen tubers naturally growing in Lac Duong district, Lam Dong province; research on spray drying to create Dangshen powder and experiment to create a synbiotic powder from spray-drying powder, oriented application in food.

33p guitaracoustic09 14-01-2022 34 1   Download

The objectives of the thesis: Isolation and determination of chemical structures of the isolated compounds from the leaves of Excoecaria agallocha L. and Excoecaria cochinchinensis Lour.; studied the cytotoxic, anti-inflammatory, and antimicrobial activities of the isolated compounds to find the bioactive compounds.

27p closefriend09 16-11-2021 33 3   Download