Electronic structure

In this research, first-principle calculations have been performed to study the geometry structure and electronic properties of ZnO. All possible exchange-correlation energy functionals were used to perform geometry optimization of ZnO in order to find the efficient calculation conditions.

10p vibenya 31-12-2024 2 2   Download

This paper was performed to evaluate the photothermal effect of pure gold nanoparticles (Au NPs) prepared by electrochemical method at different voltages, under laser irradiation in the safe wavelength range. The formation, morphological, and structural properties of Au NPs were analyzed by UV-Vis absorption spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD).

11p viprimi 16-12-2024 2 1   Download

Lecture Electronic commerce - Chapter 18: Social Networks and Industry Disruptors in the Web 2.0 Environment learning objectives: Understand the Web 2.0 revolution, social and business networks and industry and market disruptors. Describe Google and the search engine industry, the impact on advertisement, and the industry competition. Understand the concept, structure, types and issues of virtual communities. Understand the social and business networks and describe MySpace, Flicker, Facebook, CyWorld, and other amazing sites

55p caphesuadathemtac 09-11-2021 34 4   Download

Lecture Electronic commerce - Chapter 2: E-Marketplaces: Structures, Mechanisms, Economics, and Impacts learning objectives: Define e-marketplaces and list their components. List the major types of e-marketplaces and describe their features. Describe the various types of EC intermediaries and their roles. Describe electronic catalogs, shopping carts, and search engines. Describe the major types of auctions and list their characteristics.

53p caphesuadathemtac 09-11-2021 11 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 7 3   Download

In this thesis, we research and fabricate AgNDs, AgNFs, AuNFs structures on silicon by chemical deposition and electrochemical deposition method for the main purpose of using as SERS substrate. To this target, we have studied the morphology, structure and some properties of the nanostructures produced.

26p extraenglish 24-05-2021 30 4   Download

In this thesis, we research and fabricate AgNDs, AgNFs, AuNFs structures on silicon by chemical deposition and electrochemical deposition method for the main purpose of using as SERS substrate. To this target, we have studied the morphology, structure and some properties of the nanostructures produced.

26p capheviahe27 23-02-2021 34 4   Download

The purposes of research "Electronic transport in semiconductor nanostructure based on polar material AlGaN/GaN and Penta-Graphene nanoribbon" studying on electronic transport phenomena in semiconductor nano structures such as AlGaN/GaN and penta-graphene nanoribbon.

37p capheviahe27 23-02-2021 23 4   Download

Polypropylene/ maleic anhydride /organic montmorillonite nanocomposites (PP/ MA/ Org-MMT) have been prepared via direct melt intercalation in an internal mixer. Maleic anhydride (MA) was used as a compatibilizer to improve the dispersability of the clay. The structures of nanocomposites have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Mechanical properties and thermal stability were determined by tensile analysis and thermogravimetric analysis (TGA), respectively.

8p 12120609 01-06-2020 23 2   Download

2D nanomaterials such as graphene and transition metal dichal  cogenides (TMDCS) have shown outstanding potential in many fields such as fl exible electronics, sensing and optics due to their desirable physical and structural properties. High quality black phosphorus atomic layers by liquid phase exfoliation include Experimental Section; Supporting Information and Acknowledgements.

6p dangthaitrieu 11-05-2015 39 4   Download

Introducing site-directed mutations in surface-exposed residues of subunit II of the heme aa3 cytochrome c oxidase of Paracoccus denitrificans, we analyze the kinetic parameters of electron transfer from reduced horse heart cytochrome c. Specifically we address the following issues: (a) which residues on oxidase contribute to the docking site for cytochrome c, (b) is an aromatic side chain required for electron entry from cytochrome c, and (c) what is the molecular basis for the previously observed biphasic reaction kinetics....

9p system191 01-06-2013 37 3   Download

The organization of Arabidopsis thaliana photosystem II (PSII) and its associated light-harvesting antenna (LHCII) was studied in isolated PSII–LHCII supercomplexes and native membrane-bound crystals by transmission electron microscopy and image analysis. Over 4000 single-particle projections of PSII– LHCII supercomplexes were analyzed. In comparison to spinach supercomplexes [Boekema, E.J., van Roon, H., van Breemen, J.F.L. & Dekker, J.P. (1999) Eur. J. Biochem.

9p system191 01-06-2013 31 4   Download

The purified soluble forms of the histidine kinases BvgS and EvgS of Bordetella pertussis and Escherichia coli, respectively, are shown to be responsive to oxidized ubiquinone-0 (Q-0) in vitro. The oxidized ubiquinone is a strong inhibitor of kinase activity of both enzymes with half maximal inhibition occurring at 11 lM (BvgS) and 4 lM (EvgS). Reduced Q-0 has no effect on the histidine kinases. Kinase activity can reversibly be switched off and on by changing the oxidation status of the quinone....

6p research12 01-06-2013 23 4   Download

The citric acid or tricarboxylic acid cycle is a central element of higher-plant carbon metabolism which provides, among other things, electrons for oxidative phosphorylation in the inner mitochondrial membrane, intermediates for aminoacid biosynthesis, and oxaloacetate for gluconeogenesis from succinate derived from fatty acids via the glyoxylate cycle in glyoxysomes. The tricarboxylic acid cycle is a typical mitochondrial pathway and is widespread among a-proteobacteria, the group of eubacteria as de®ned under rRNA systematics from which mitochondria arose. ...

16p research12 01-06-2013 44 3   Download

The functional replacement of the primary ubiquinone (QA) in the photosynthetic reaction center (RC) from Rhodo-bacter sphaeroideswith synthetic vitamin K derivatives has provided a powerful tool to investigate the electron transfer mechanism. To investigate the binding mode of these qui-nones to theQAbinding sitewe have determined the binding free energy and charge recombination rate from QA ± to D + (kAD) of 29 different 1,4-naphthoquinone derivatives with systematically altered structures.

13p research12 01-06-2013 53 4   Download

Wolinella succinogenesgrows by oxidative phosphorylation with polysul®de as terminal electron acceptor and either H2 or formate as electron donor (polysul®de respiration). The function of the respiratory chains catalyzing these reactions was investigated. Proteoliposomes containing polysul®de reductase (Psr) and either hydrogenase or formate dehy-drogenase isolated fromthemembrane fraction ofWolinella succinogenescatalyzed polysul®de respiration, provided that methyl-menaquinone-6 isolated fromW. ...

10p research12 01-06-2013 33 4   Download

Thecaa3-oxidase from Thermus thermophilushas been studied with a combined electrochemical, UV/VIS and Fourier-transform infrared (FT-IR) spectroscopic approach. In this oxidase the electron donor, cytochromec, is covalently bound to subunit II of the cytochrome c oxidase. Oxidative electrochemical redox titrations in the visible spectral range yielded a midpoint potential of )0.01 ± 0.01 V (vs. Ag/AgCl/3MKCl, 0.218 V vs. SHE¢) for the hemec.

9p research12 29-04-2013 49 3   Download

Glutathione reductase (GR) recycles oxidized glutathione (GSSG) by converting it to the reduced form (GSH) using an NADPH as the electron source. The function of GR in the male genital tract of the rat was examined by meas-uring its enzymatic activity and examining the gene expression and localization of the protein.

9p research12 29-04-2013 49 3   Download

The photosynthetic protein complexes in plants are located in the chloroplast thylakoid membranes. These membranes have an ultrastructure that consists of tightly stackedÔgranaÕ regions interconnectedbyunstackedmembrane regions.The structure of isolated granamembranes has been studiedhere by cryo-electron microscopy. The data reveals an unusual arrangement of the photosynthetic protein complexes, staggered over two tightly stacked planes.

11p research12 29-04-2013 43 2   Download

Tightly coupled inside-out vesicles were prepared from Paracoccus denitrificanscells (SPP, sub-Paracoccusparticles) and characterized kinetically. The rate of NADHoxidation, catalysed by SPP, increases 6–8 times on addition of gram-icidin. The vesicles are capable of catalysing DlH + -dependent reverse electron transfer fromquinol toNAD + . The kinetic parameters of the NADH-oxidase and the reverse electron transfer carried out by membrane-bound P. denitrificanscomplex I were estimated and compared with those of the mitochondrial enzyme. ...

5p research12 23-04-2013 45 3   Download