The chemistry

In this review we probe the reaction mechanisms for formation of DNA nucleobases from formamide (FM) following the free radical pathways that have been identified by quantum chemical computations. Formamide is known as a precursor of nucleobases in the prebiotic chemistry of the Early Earth or in the nitrogen-rich atmosphere such as Titan, regardless of whether water is present or absent.

34p viyoko 01-10-2024 3 1   Download

Many experimental data show that bulky substituents on the molecules enhance solubility, catalytic activity, and photophysical properties due to the prevention of π-π stacking in metal salicylaldimines.

10p vikwong 29-09-2024 5 1   Download

We present a method to produce graphene flakes (GFs) from polyethylene terephthalate (PET) bottle wastes by the pyrolysis method using modified bentonite as a catalyst. The as-synthesized GFs are analyzed in terms of crystal phase, morphology, and surface chemistry. The synthesized GFs have a porous, thin, and leaf-like morphology with a length ranging from a few hundred nanometers to a few tens of micrometers.

6p vikwong 29-09-2024 2 1   Download

This study aims to investigate the effectiveness of the green microwave technique in producing 1T/2H-MoS2 nanomaterials using polyol solvents. The paper presents a thorough analysis of the structural and property characteristics of the synthesized materials and elucidates the underlying chemical mechanism that governs the formation of hybrid-phase nanostructures. Additionally, the role of polyol solvents in the practical synthesis of nano MoS2 under microwave heating is evaluated and explained.

15p xuanphongdacy06 18-09-2024 1 1   Download

In this study, an analytical chemistry practice was established and validated via the quantification of ibuprofen in drugs using the UHPLC-PDA/MS analysis for undergraduate students. These findings demonstrate that the analytical procedure is a promising and effective method for establishing the analytical chemistry practice to meet the general education curriculum 2018 in Vietnam and serve as a valuable reference for students and teachers.

16p visergeyne 18-06-2024 4 0   Download

The Department of Organic Chemistry, the Department of Inorganic and Applied Chemistry, and the Department of Chemistry are among the six departments, six majors, and three research laboratories that make up the Faculty of Chemistry today, some 70 years after its founding. Physical chemistry, analytical chemistry, polymer chemistry, medicinal chemistry, and three key-research labs, including the labs for natural compounds, cancer, and computational chemistry.

6p dianmotminh02 03-05-2024 7 1   Download

In recent times many research activities have been carried out to prove the metal ion detection ability of Schiff bases. [13,14] In the present study, a new Schiff base has been synthesized from 5-bromo-2- hydroxybenzaldehyde and naphthalene-1,8-diamine and it is complexated with Co(II), Ni(II), Cu(II) and Zn(II) ions. The biological application of all the compounds has been analyzed and metal ions recognition property of the Schiff base has also been studied.

16p dianmotminh02 03-05-2024 8 2   Download

A new semi-empirical technic has been established relying on the linkage between the chemistry in the bulk liquid and that taking place in the acoustic cavitation bubble. The open-source COPASI software has been used for the optimization of number density according to the total yield of a single bubble and the fitting of the experimental yield of hydrogen peroxide in the sonicated solution. It was observed that the number density is increased with the rise of ultrasound frequency from 200 to 1140 kHz, independently of the saturating gas nature (O2, Ar or air).

10p dianmotminh02 03-05-2024 4 3   Download

The present paper is focused on the impact of the dissolution mechanism of the different species (formed within a single bubble) on bubble chemistry. This process is analyzed on a range of ultrasound frequencies from 140 to 515 kHz, at an acoustic intensity of 1 W/cm². The obtained findings are compared to the results available in the literature.

14p dianmotminh02 03-05-2024 7 2   Download

Cuốn giáo trình "Tiếng Anh trong kỹ thuật hóa học" được biên soạn nhằm bổ sung cho sinh viên các từ vựng, tổ hợp từ, thuật ngữ, cấu trúc ngữ pháp hay gặp trong những tài liệu khoa học kỹ thuật, giúp sinh viên làm quen với việc dịch Anh-Việt và ngược lại, viết một văn bản khoa học bằng tiếng Anh. Sách được chia thành 2 phần, mời các bạn cùng tham khảo phần 1 cuốn sách.

90p oursky04 05-09-2023 23 6   Download

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 7 3   Download

The objectives of this research work are: Study the clay intercalation by organic dye and develop a process to produce nanoclay-dye pigment with better stability and good performance; Conduct structural characterization to verify the level of intercalation and stability of clay-dye pigment by using X-Ray diffraction (XRD) and Transmission Electron Microscopy (TEM); Investigate the thermal stability of clay dye pigment using Thermo Gravimetric Analysis (TGA) to reveal the effect of dye intercalation into the clay on improving thermal stability of organic dye; Compound the clay- pigment with ...

141p runthenight07 01-03-2023 5 3   Download

This study has adopted a systematic approach to identify the extent to which 20 kHz ultrasound affects the particle size and solubility of different protein solutions containing 4%, 7% and 10% whey proteins, caseins or a mixture at a range of energy densities (15-400 J/mL) and various pH (4.0-9.0). Milk proteins hold a prominent place in the food industry as they are used in many manufactured products for their functionality and most importantly nutritional benefits.

136p runthenight04 02-02-2023 5 1   Download

The thesis is organised as follows: Chapter 1 comprises the literature review of protein structure, amyloid fibrils and of the effect of nanomaterials on protein aggregation. Chapter 2 reviews the computational methods used to perform simulations and analysis. Chapter 3 comprises my published article on benchmarking forcefields and sampling methods for disordered proteins using amylin as a case study. Chapter 4 comprises my published article on the effect of oxidation on the properties of graphene oxide flakes in solution.

56p runthenight04 02-02-2023 12 3   Download

Mục đích nghiên cứu sáng kiến "Tiếp cận kỳ thi chuẩn hóa quốc tế chương trình Hóa học THPT - SAT II Chemistry và xây dựng một số nội dung dạy học phần Tốc độ phản ứng, Cân bằng hóa học theo SAT II Chemistry" nhằm tìm hiểu các bài thi chuẩn hóa môn Hóa học mang tính quốc tế như SAT cũng là một nhu cầu đối với giáo viên nhằm đón đầu xu thế đổi mới giáo dục hiện nay.

65p matroicon0804 21-11-2022 15 4   Download

Acta Crystallographica Section C: Structural Chemistry specializes in the rapid dissemination of high-quality detailed studies of novel and challenging crystal and molecular structures of interest in the fields of chemistry, biochemistry, mineralogy, pharmacology, physics and materials science. The unique checking, editing and publishing facilities of the journal ensure the highest standards of structural reliability and presentation, while providing for reports on studies involving special techniques or difficult crystalline materials.

22p runordie3 27-06-2022 12 2   Download

The report of an IUPAC Task Group, formed in 2011 on “Intensities and line shapes in high-resolution spectra of water isotopologues from experiment and theory” (Project No. 2011-022-2-100), on line profiles of isolated high-resolution rotational-vibrational transitions perturbed by neutral gas-phase molecules is presented.

13p runordie3 27-06-2022 8 2   Download

Thermostable and highly water-soluble polymers are essential for polymer flooding — one of the most effective methods used in the enhanced oil recovery (EOR) in hightemperature (HT) offshore reservoirs. In this research, the copolymerization reaction of acrylamide (AM) and N-vinylpyrrolidone (NVP) monomers were performed via a freeradical mechanism induced by gamma-rays (γ-rays) irradiation.

79p viabigailjohnson 10-06-2022 13 3   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 29 3   Download

Its interrelated objectives are: To investigate the effectiveness of the ESP blended learning program for second year students majoring in Chemistry in a university in Hanoi from the students and teachers’ perspectives; to find out difficulties encountered by teachers and students during their teaching and learning time in this ESP blended learning program.

79p closefriend09 16-11-2021 28 6   Download