Oxidative properties

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  • The current book consists of eighteen chapters divided into three sections. Section I includes nine topics in characterization techniques and evaluation of advanced ceramics dealing with newly developed photothermal, ultrasonic and ion spattering techniques, the neutron irradiation and the properties of ceramics, the existence of a polytypic multi-structured boron carbide, the oxygen isotope exchange between gases and nanoscale oxides and the evaluation of perovskite structures ceramics for sensors and ultrasonic applications....

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  • A water soluble glucan isolated from hot aqueous extract of fruit bodies of an edible hybrid mushroom Pfle1r of Pleurotus florida and Lentinula edodes showed macrophages, splenocytes, and thymocytes activation. The glucan consists of terminal, (1→3,6)-linked, and (1→6)-linked β-D-glucopyranosyl moieties in a molar ratio of nearly 1:1:3. On the basis of acid hydrolysis, methylation, periodate oxidation study, and NMR studies (1H, 13C, DEPT-135, TOCSY, DQF-COSY, NOESY, ROESY, HSQC, and HMBC), the structure of the repeating unit of the glucan was established as:...

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  • Tham khảo sách 'selective catalytic reduction technology for the control of nitrogen oxide', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • In this work, platinum nanoparticles were dispersed on SBA-15 mesoporous material by incipient wetness method and the synthesized materials were characterized by XRD, TEM, EDX spectroscopies and N2 adsorption-desorption isotherm measurement. The results indicated that 2D hexagonal ordered structure of SBA-15 was still maintained after grafting Pt on SBA-15 support and platinum nanoparticles existed both inside and outside the pore channels of SBA-15 material. Catalytic activity of these materials was tested in the aqueous phase D-glucose oxidation as a model reaction. ...

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  • Beta-amyloid (1–40) (Abeta), the main component of senile plaques seen in the brains of Alzheimer’s disease patients, was found to be toxic both as fibrils and smaller soluble globular aggregates. The hydrolytic properties of Abeta, a new biochemical activity described previously [Brzyska M, Bacia A & Elbaum D (2001)Eur J Biochem268, 3443–3454], may contribute to its overall toxicity.

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  • Fe-SBA-15 and Fe-SBA-16 ordered mesoporous materials were synthesized via hydrothermal treatment by in situ incorporating Fe(III) oxalate complex species into framework of SBA-15 and SBA-16. The prepared samples were characterized by different techniques such as XRD, BET, UV- Vis and TEM. The obtained results showed that both Fe-SBA-15 and Fe-SBA-16 samples have an ordered mesoporous structure. The hexagonal symmetry of Fe-SBA-15 and cubic ones of Fe-SBA- 16 were not affected by incorporation of Fe into SBA-15 and SBA-16 frameworks.

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  • A new functionalized conducting poly(5-hydroxy-1,4-naphthoquinone-co-5-hydroxy-3-acetic acid-1,4-naphthoquinone) with electroactive quinone group was studied by in situ Raman spectroscopy. The Raman results confirmed a good reversible transformation between two structures: quinoid and hydroquinoid ones during reduction-oxidation processes.

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  • Polymers present a class of materials that play a role of importance growing in catalysis. Polymeric catalysts based on polypropylene-polyacrylic acid (PP-APA) were prepared by the two methods: co-polymerization in the presence of transition metal ions (Cu(II), Fe(III), Co(II), Mn(II)…) and soaking method. Their catalytic activity was determined by oxidation reactions of ions S2- and hydroquinone by molecular oxygen in normal condition.

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  • After studying this chapter you will be able to know the binding change mechanism of ATP formation. Know the properties of the ADP/ATP translocator and the Pi/H+ symport. Understand how the transport of these compounds across the inner envelope relates to PMF and energy consumption. Know how ETC and oxidative Phosphorylation are regulated by ADP and ATP levels.

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  • The recently published novel integrinaIIbb3 ectodomain crystallographic structure and NMR structures of its transmembrane⁄cytoplasmic segments were employed to refine previously developed molecular models. Alterna-tive complete aIIbb3 models were built and evaluated, and their shape was compared with EM maps and their computed hydrodynamic⁄conforma-tional properties were compared with the available experimental data.

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  • NMR and visible spectroscopy coupled to redox measurements were used to determine the equilibrium thermodynamic properties of the four haems in cytochrome c3 under conditions in which the protein was bound to lig-ands, the small anion phosphate and the protein rubredoxin with the iron in the active site replaced by zinc.

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  • GlutathioneS-transferases (GSTs) play critical roles in detoxification, response to oxidative stress, regeneration of S-thiolated proteins, and cata-lysis of reactions in nondetoxification metabolic pathways. Liver GSTs were purified from the anoxia-tolerant turtle,Trachemys scripta elegans. Purification separated a homodimeric (subunit relative molecular mass¼ 34 kDa) and a heterodimeric (subunit relative molecular mass¼32.6 and 36.8 kDa) form of GST.

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  • First-principles calculations based on the density functional theory are used to study the electronic structure of LaNiO3 perovskite for application of cathode material in solid oxide fuel cell. Our results show that bulk LaNiO3 exhibits metallic behavior. For 1x1x1 LaNiO3 unit cell, increasing in-plane strain leads to the increase in the density of states (DOS) at the Fermi level.

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  • Metals are used as biomaterials due to their excellent electrical and thermal conductivity and mechanical properties. Since some electrons are independent in metals, they can quickly transfer an electric charge and thermal energy. The mobile free electrons act as the binding force to hold the positive metal ions together. This attraction is strong, as evidenced by the closely packed atomic arrangement resulting in high specific gravity and high melting points of most metals.

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  • Composite materials often demand a unique combination of properties, including high thermal and oxidative stability, toughness, solvent resistance and low dielectric constant. This book, "Thermoplastic - Composite Materials", is comprised of seven excellent chapters, written for all specialized scientists and engineers dealing with characterization, thermal, mechanical and technical properties, rheological, morphological and microstructure properties and processing design of composite materials.

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  • Electrochemistry has been undergoing significant transformations in the last few decades. It is now the province of academics interested only in measuring thermodynamic properties of solutions and of industrialists using electrolysis or manufacturing batteries, with a huge gap between them. It has become clear that these, apparently distinct subjects, alongside others, have a common ground and that they have grown towards each other, particularly as a result of research into the rates of electrochemical processes....

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  • Permanganate may be applied to sites as either potassium permanganate (KMnO4) or sodium permanganate (NaMnO4). Where cost dominates over engineering factors at a site, potassium permanganate is the preferred chemical form because it is more widely available, less costly, and is available in solid form, which facilitates transport and handling. Where other factors are more important, the liquid form of sodium permangante is preferable.

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  • are not limited to: the wide range of oxidation and reduction reactions possible, the possibility of reaching very high levels of product purity and selectivity, and significantly less energy requirement. The process of electropolymerization leads to simple and reproducible formations of polymer films, which led to a broad material diversity of applications. Nowadays, electrochemistry plays an important role in a wide number of fundamental research and applied areas.

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  • This epigraph is very correct for the Russian Federation today because the average lifespan of Russian men in this country is 57 years (Russian women are living on ten years more). It is statistical data. Russian scientists are an exception. Particularly, the majority of contributors of this volume are older then 60 and the editor of volume is older then 75.

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  • According to American Society for Testing and Materials' corrosion glossary, corrosion is defined as "the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties".1 Other definitions include Fontana's description that corrosion is the extractive metallurgy in reverse,2 which is expected since metals thermodynamically are less stable in their elemental forms than in their compound forms as ores.

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