Electrostatic complexes

Ebook "Quantum modeling of complex molecular systems" includes methodological advances and original applications to actual chemical or biochemical phenomena which were not possible before the increased sophistication of modern computers. The chapters contain detailed reviews of the developments of various computational techniques, used to study complex molecular systems such as molecular liquids and solutions (particularly aqueous solutions), liquid-gas, solid-gas interphase and biomacromolecular systems.

524p tudohanhtau1006 29-03-2024 5 1   Download

Ebook "Heterocyclic supramolecules II (Topics in heterocyclic chemistry, Volume 18)" which is a continuation of Supramolecular Chemistry I, is a review of recent studies on intermolecular interactions connecting (and occasionally repelling) the molecules together with a few individual topics including formation, structure, and function of crystalline-state host-guest supramolecular systems and intelligent supramolecular nano assemblies and highly stereoselective 1,3-dipolar cycloaddition catalyzed by supramolecular complex.

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Ebook "The structure and rheology of complex fluids" describes the microstructures of polymeric, colloidal, amphiphilic, and liquid crystalline liquids, and the relationship between microstructure and mechanical and flow properties. This book provides illustrations, practical examples, and worked problems. It serves as both a textbook for a graduate course and a research monograph.

682p loivantrinh 29-10-2023 10 2   Download

The aim of this study was to evaluate and characterize the interaction between fish gelatin (FG) and Gum Arabic (GA) and its effects in obtaining optimal atomization conditions. The technological properties of FG-GA shown high potential to be applied in the food industry as well in other industrial fields like chemical and pharmaceutical areas.

11p vihermione 06-01-2023 8 2   Download

The effects of pH, ionic strength and polymer ratio in the complexation of chitosan (CHI) with different anionic polysaccharides, namely gum Arabic (GA), sodium alginate (ALG) and κ-carrageenan (CRG), were investigated. This was made using titration techniques, which allowed the determination of stoichiometry and binding constant of complexes.

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The compounds were characterized by analytical and spectral methods. In addition, X-ray diffraction was performed to characterize and obtain detailed information about the structure of 3. The fully optimized geometries of compounds 3 and 4 were calculated at different basis sets by using the Gaussian09 (G09) software to investigate their 3D geometries and electronic structures. Comparisons between the calculated and experimental data including molecular structures, fundamental vibrational modes, and electronic properties were made.

17p langthannam 29-12-2021 12 0   Download

Polymers bearing quaternized 4-vinylpyridine (QVP) groups are known for their antibacterial activities and these polymers can form polyelectrolyte complexes (PEC) with polyanions through electrostatic interactions. PEC formation can be used to adjust the antibacterial activity of polymers of QVP, deliver active molecules, or design antibacterial supramolecular structures. However, the antibacterial activity of PECs of QVP polymers has not been investigated. In this study, a copolymer of QVP was mixed with polyacrylic acid in various molar ratios of components to form PECs.

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A wide range of products are produced in the chemical producing industry such as textile dyes, chemicals, printing dyes and chemicals, paper chemicals, electrostatic powder dyes, and optical brighteners. The aim of this study is to investigate the treatability of chemical oxygen demand (COD), aromaticity, and color in the wastewater of this sector, where highly complex chemicals are used. Most of the studies in the literature are related to the treatment of synthetically prepared dyed wastewater.

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Twelve stable structures of the interactions of HCN with RCHO (R = H, F, Cl, Br, NH2, CH3) are located on the potential energy surface at the MP2/aug-cc-pVDZ level. Interaction energies including both ZPE and BSSE corrections range from -5.80 to -21.07 kJ.mol-1 . The result of SAPT analysis shows that the electrostatic component has mainly contributed to the stability of the complexes. It is remarkable that the most stable complex of HCHO∙∙∙HCN is P1-Hb which has not been reported in the literature.

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There is still a controversy over the mechanism of promoter DNA strand separation upon open transcription complex (RPo) formation by Escheri-chia coli RNA polymerase: is it a single or a stepwise process controlled by Mg 2+ ions and temperature? To resolve this question, the kinetics of pseudo-first-order oxidation of thymine residues by KMnO4 in the )11…+2 DNA region of RPo at thekPRpromoter was examined under single-hit conditions as a function of temperature (13–37
C) in the absence or presence of 10 mmMgCl2....

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Plastocyanin (Pc) is a soluble copper protein that transfers electrons from cytochromeb6 fto photosystem I (PSI), two protein complexes that are localized in the thylakoid mem-branes in chloroplasts. The surface electrostatic potential distributionof Pc plays akey role in complex formationwith the membrane-bound partners. It is practically identical for Pcs fromplants and green algae, but is quite different for Pc fromferns.

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Relentless assaults on the frontiers of CMOS technology over several decades have produced a marvel of a technology. The world we live in has been changed by complex integrated circuits now containing a billion transistors with line widths of less than 100 nm, fabricated in plants costing several billion dollars. This microelectronics revolution was made possible only through the dedication and ingenuity of many specialized experts with detailed knowledge of their crafts.

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