Chemical investigation

Chemical investigation of the sesame-associated fungal strain Penicillium hetheringtonii IMBC-NMTP04 resulted in isolation of five compounds, penicitrinone A (1), dihydrocitrinin (2), janthinone (3), coniochaetone B (4), and 9-oxo-10(E),12(E)-octadecadienoic acid (5).

8p viambani 18-06-2024 2 1   Download

This work aims to investigate the mechanism of Pd nucleation and growth onto glassy carbon electrode from ChCl/urea/palladium mixture at room temperature using cyclic voltammetry (CV) and chronoamperometry (CA) techniques. Furthermore, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy were used to examine the crystalline structure, morphology and compositions of deposited Pd samples.

14p viambani 18-06-2024 2 1   Download

Part 2 book "Introduction to health and safety in construction" includes content: Work equipment hazards and control; manual and mechanical handling hazards and control; electrical hazards and control; fire hazards and control; chemical and biological health hazards and control; physical and psychological health hazards and control; incident investigation, recording and reporting; monitoring review and audit; summary of the main legal requirements; study skills.

314p dianmotminh03 09-06-2024 2 1   Download

Garcinia multiflora belonging to the Clusiaceae family is one of the medicinal plant species native to Viet Nam and southern China and its use is an ethno-medicinal remedy to treat acne, scabies, constipation, and inflammation. In this paper, the chemical investigation on the fruits of Garcinia multiflora growing in the north of Vietnam was reported.

9p viamancio 04-06-2024 1 0   Download

In addition, their inhibitory activity on NO production and cytotoxic effects against human embryonic kidney cells (HEK-293A) and human hepatocellular carcinoma (HepG2) were evaluated. This is the first study of the phytochemical investigation of P. ginseng sprouts cultivated in Vietnam and ginseng sprouts also contained the same main active ginsenosides as in the 4–6-year old roots.

7p dianmotminh02 03-05-2024 4 1   Download

In this research, in an attempt to make use of the kaolin resources in Vietnam, we present a synthetic process of zeolite A via hydrothermal from kaolinite, together with the modification process of zeolite A using different metallic cations. The characteristics of the prepared zeolite LTAs such as chemical composition and crystalline structure, as well as their catalytic activity in the methanation reaction of carbon dioxide (CO2) to methane (CH4) were extensively investigated.

8p dianmotminh02 03-05-2024 3 1   Download

Nowadays, supercapacitors have been among popular electrochemical energy storage devices in modern life. Plenty of active materials have been investigated and developed to meet the increasing demands for high-performance supercapacitors. In this study, we introduce a facile chemical synthesis route in combination with a subsequent calcination process to fabricate the oxide/hydroxide composites of nickel (Ni) and copper (Cu) as active materials for highperformance asymmetric supercapacitors.

9p dianmotminh02 03-05-2024 3 1   Download

CuO nanoparticles were synthesized by alcohol-assisted hydrothermal method at various pH values, using sodium hydroxide as a precursor for pH control. The chemical composition, morphological and structural properties of the obtained CuO nanoparticles were investigated by the Raman and energy-dispersive X-ray spectroscopies, the field-emission scanning electron microscopy, and the X-ray diffraction.

12p dianmotminh02 03-05-2024 2 1   Download

This global minimum structure has the shape of a tetragonal bipyramid having two Sc atoms at two tops of pyramids binding with one edge of Ge-Ge. The ground electronic state of the global minimum isomer is the 2B2 state in the C2v symmetry. The most stable isomer of Sc2Ge6 − has been used to study the CO adsorption. The calculated results indicate that the Sc2Ge6 − cluster has a good interaction with the CO molecule. The adsorption positions are around the Sc atom with two stable models include adsorbing the C atom and adsorbing both the C and O atoms of the CO molecule.

7p dianmotminh02 03-05-2024 2 1   Download

The influence of the black seed oil modified epoxy resin (EBSO)/monomer 3,4-epoxycyclohexylmethyl 3,4- epoxycyclohexane carboxylate (BCDE) weight ratio in the coatings based on the compounds and photoinitiator triarylsulfonium hexafluoroantimonate (TAS) on thermal properties of photocrosslinked coatings have been studied. The chemical structure of investigated UV-cured coatings was characterized by IR spectrometric analysis. Their thermogravimetric (TG) and differential scanning calorimetry (DSC) behavior were determined by TG and DSC analysis, respectively.

9p dianmotminh02 03-05-2024 3 1   Download

The first chemical investigation on Cardiospermum halicacabum L. growing in Vietnam led to the isolation and structural determination of nine flavonoid compounds, including quercetin 3-O-β-D-glucoside, quercetin 3-O-α-Lrhamnoside, quercetin, kaempferol 3-O-α-L-rhamnoside, kaempferol, apigenin 7-O-β-D-glucuronide butyl ester, apigenin 7-O-β-D-glucuronide methyl ester, apigenin, and luteolin.

4p dianmotminh02 03-05-2024 5 1   Download

The present study investigated the phytochemical and biological properties of the rhizomes C. aromatica. From the CHCl3 extract of C. aromatic rhizomes, six known compounds, including (-)-hannokinol, (3R,5R)-3,5-diacetoxy-1,7-bis(4- hydroxyphenyl)heptane, naringenin, 2-(4- (hydroxymethyl)phenyl)propan-2-ol, 5-hydroxymethylfurfural, and bisacurone, were isolated. All compounds were tested on the biological inhibitory activities against tyrosinase, αglucosidase, and urease. It was the first time all compounds were isolated from rhizomes of C. aromatica Salisb.

6p dianmotminh02 03-05-2024 2 2   Download

This article presents computational insights into the geometric and electronic structures of NbSi4 −/0 clusters using density functional theory and the CASSCF/CASPT2 method. The anionic and neutral ground states are identified as the 1A′ and 2A′ states, respectively, within a trigonal bipyramidal isomer where the Nb atom occupies the equatorial position. The adiabatic detachment energy for the transition from the anionic ground state 1A′ to the neutral ground state 2A′ is estimated to be 2.30 eV.

8p dianmotminh02 03-05-2024 4 2   Download

wo germacranolide sesquiterpenes, 9β-acetoxy-3-epi-nobilium, zoapatanolide B and four benzoate ester derivatives, benzyl 2-O-β-D-glucopyranosyl-6-methoxybenzoate, benzyl 2-O-β-D-glucopyranosyl-6- hydroxybenzoate, methyl 2-O-β-D-glucopyranosylbenzoate, ficuside G were isolated from aerial part of Sigesbeckia orientalis. Structural elucidation of the isolated compounds was done using a combination of HR-ESI-MS, one-dimensional and two-dimensional NMR spectral methods, and comparison their spectral data with the previous literature.

7p dianmotminh02 03-05-2024 4 2   Download

Assessment is a topic that continues to be developed in science education research. Assessment evaluates not only students' cognitive abilities but also their thinking skills. Therefore, in this study, an assessment that could measure students' chemical literacy was developed.

11p viarnault 25-04-2024 1 1   Download

Ebook "Structure and reactivity of metals in zeolite materials" provides the reader with the most up-to-date and relevant knowledge on the reactivity of metals located in zeolite materials, either in framework or extra-framework positions, and the way it is connected with the nature of the chemical environment provided by the host.

316p tracanhphuonghoa1007 22-04-2024 5 3   Download

The prime objective of the current study is to investigate the determinant of the green supply chain, the impact of the green supply chain on the sustainable performance and lastly the impact of the sustainable performance eon the organizational performance of the Thai chemical firms. The study has employed the survey-based method to answer the research questions as manufacturing managers are surveyed as ultimately, manufacturing managers are responsible for the performance of the organizations for which they work.

8p longtimenosee09 08-04-2024 4 0   Download

Part 2 book "Cambridge IGCSE® chemistry coursebook" includes content: How far, atterns and properties of metals, industrial inorganic chemistry, organic chemistry, petrochemicals and polymers, chemical analysis and investigation.

181p muasambanhan10 06-04-2024 5 0   Download

With Beech veneers being treated with 10% solid content of the chemicals from paper (Alkyl ketene dimer, AKD), wood (N-methylol melamine, NMM-1) and textile industry (fatty acid modified N-methylol melamine, mNMM-2), the results showed that the treatments with these chemicals considerably increased the water repellence effectiveness (WRE) of veneers in the initial submersion phases. In this paper, veneers treated with Nmethylol melamine and AKD chemicals were investigated on water/moisture related properties and their stability after cyclic tests.

12p vilarry 01-04-2024 1 1   Download

Ebook "Dynamic pulsed-field-gradient NMR (Springer series in Chemical physics, Volume 110)" dealing with the basics, theory and applications of dynamic pulsed-field-gradient NMR NMR (PFG NMR), this book describes the essential theory behind diffusion in heterogeneous media that can be combined with NMR measurements to extract important information of the system being investigated.

364p tudohanhtau1006 29-03-2024 3 1   Download