Water 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

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 9 3   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

Research objectives of the thesis: The thesis was conducted to research and develop a new type of electrode: glass charcoal electrodes modified by flower platinum nano (PtNFs/GC) and to evaluate the properties of fabricated electrodes: electrode structure, morphology, physical and chemical properties.

28p extraenglish 24-05-2021 31 4   Download

Học phần Hóa nước giới thiệu những kiến thức cơ bản về sự hình thành thành phần hoá học của các nguồn nước tự nhiên, quy luật diễn biến của những thành phần hoá học đó; các nguyên lý động học và cân bằng hoá học liên quan đến các quá trình hoá học xảy ra trong các hệ thống nước; phương pháp phân tích định lượng xác định thành phần hoá học của nước và đánh giá chất lượng nguồn nước đó.

13p lovebychance01 17-04-2021 33 2   Download

Studying and orienting applicability to detecting, quantifying separately and simultaneously cadmium, lead in aqueous environment by means of stripping voltammetry method with the desire that the nanostructures of the electrodes help increase the sensitivity of the analytical method.

28p capheviahe26 25-01-2021 30 4   Download

Study the structural, morphological and physicochemical properties of synthetic materials by modern physical and chemical methods such as XRD, FTIR, SEM, TEM, XPS, EDX, BET, TG-DTA, UV -Vis; evaluation of photochemical catalyst using visible light in the decomposition of dyes RR-195, RY-145 on synthetic materials.

27p capheviahe26 25-01-2021 42 3   Download

Fabbrication of electrocatalyst materials on the IrO2 basis for oxygen evolution reaction in proton exchange membrane water electrolyser PEMWE; applying to fabbricated proton exchange membrane water electrolyser PEMWE to produce hydrogen.

26p larachdumlanat129 20-01-2021 25 5   Download

The research using some advanced, environmentally friendly materials such as water-absorbing polymers and soil-binding polymers in potting medium is also a new direction to improve water retention. The study of manufacturing polybags with different degradation time combined with the use of SAP and PAM in substrates of pots to improve some features of the current nursery.

27p larachdumlanat129 20-01-2021 20 2   Download

The study has indicated that MOFs has maintained extensive applications in Biological imaging and sensing, Drug delivery systems, Methane storage, Semiconductors, Bio-mimetic mineralization, Carbon capture, Desalination/ion separation, Water vapor capture and Ferroelectrics and Multiferroics.

20p tocectocec 25-05-2020 20 1   Download

The objectives of the thesis: Fabrication of diaphragm sensing material based on phenyl conductive polymer has stability and high sensitivity with heavy metal cations, which is used to identify and analyze heavy metal traces in water. Mời các bạn tham khảo!

26p xacxuoc4321 08-07-2019 48 6   Download

The thesis has found a new method to increase the pore size of mesoporous carbon by filling the liquid glass into the pore of the template (silica SBA-15) before impregnating the carbon presource to limit the penetration of carbon sealed the pore system of SBA-15. Stability of mesoporous carbon is increases due to silicon are partially retained in materials. This technique opens the way of synthesis of mesoporous carbon as an adsorbent with a desired pore size and stability.

28p xacxuoc4321 08-07-2019 41 7   Download

Biochemistry is the study of the chemical composition and reactions of living matter. All chemicals in the body fall into one of two major classes: organic or inorganic compounds. Organic compounds contain carbon. All organic compounds are covalently bonded molecules, and many are large. All other chemicals in the body are considered inorganic compounds. These include water, salts, and many acids and bases. Organic and inorganic compounds are equally essential for life.

51p tangtuy07 02-04-2016 41 3   Download

Department of Chemistry ‘IFM’, University of Torino, Italy; 2Department of Biology, University ‘Roma Tre’, Rome, Italy; 3Department of Structural and Functional Biology, University of Insubria, Italy Haem binding to human serum albumin (HSA) endows the protein with peculiar spectroscopic properties. Here, the effect of ibuprofen and warfarin on the spectroscopic properties of ferric haem –human serum albumin (ferric HSA–haem) and of ferrous nitrosylated haem –human serum albumin (ferrous HSA –haem-NO) is reported.

7p system191 01-06-2013 46 3   Download

I. Pronunciation: Khoanh tròn từ có phần gạch dưới phát âm khác với những từ còn lại: (1ms) Câu 1: A. cooked B. stopped C. watered D. finished Câu 2: A. share B. atmosphere C. care D. everywhere Câu 3: A. floor B. usually C. casual D. poor Câu 4: A. championship B. school C. chemistry D. Christmas II. Grammar and vocabulary: Chọn đáp án tốt nhất: (4ms) Câu 5: They were sent to a local………right after their parents' death. A. prison B. hospital C. park D. orphanage Câu 6: My son didn't go to the theatre .......he was 16 years old. A. since B. for C. after D. until...

5p rrtrungrr11 27-03-2013 266 63   Download

The water permeability of biological membranes has been a long-standing problem in physiology, but the proteins responsible for this remained unknown until discovery of the aquaporin 1 (AQP1) water channel protein. Peter Agre received Nobel prize in Chemistry in 2003 for this discovery.

32p mobifone23 21-01-2013 43 6   Download

The organisation of sewers and systems is closely related to the different types of industry and, as a result, a whole array of configurations exist. In all cases, it is essential to avoid unnecessary dilution during treatment.

91p real_spamer9x 03-12-2012 89 21   Download

Lichen is a special form of life is formed by the symbiosis between algae and some fungi. The mycelium absorbs water and minerals provide the algae. Algae due to chlorophyll, use them to make organic matter to feed on both sides. In this common life of algae and fungi have a certain role, neither party relying solely on the real nao.Hinh is called symbiosis.

147p nhatro75 12-07-2012 131 22   Download

Aldehydes and Ketones – Form acetals and ketals respectively with normal methanol-containing reagents – Water formed in this reaction will then be titrated to give erroneously high water results – With aldehydes a second side reaction can take place, consuming water, which can lead to sample water content being underestimated – Replacing methanol with another solvent can solve the difficulties (commercial reagents are widely available)

14p qdung92ct 03-07-2012 73 6   Download

HÓA HỌC CỦA THỦY QUYỂN (WATER CHEMISTRY) Thuỷ quyển là một vùng có chiều dày khoảng 10 đến 20km bắt đầu từ độ sâu khoảng dăm bảy kilômét trong vỏ trái đất tiến lên phía trên khoảng 12km trong khí quyển. Hầu hết lượng nước này (97%) là nước ở các đại dương và là nước mặn. Trong số 3% còn lại thì 2,7% là ở trạng thái rắn - khối băng, 0,3% là nước ngọt ở các lục địa (nước mặt và nước ngầm) và hơi nước trong khí quyển. ...

25p doquyenhong 28-10-2011 232 60   Download