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Articles de revues sur le sujet « Isolated electrons »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

MISHRA, M. K., and A. PHUKAN. "Electron heating in a multi-dipole plasma by electrostatic plugging." Journal of Plasma Physics 79, no. 2 (2012): 153–61. http://dx.doi.org/10.1017/s0022377812000815.

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AbstractThe effect of the electrostatic confinement potential on electron number densities and electron temperatures under bi-Maxwellian approximation for electron distribution function has been studied in an electrostatically plugged multi-dipole argon plasma system. Electrostatic plugging is implemented by biasing the electrically isolated multi-dipole magnetic cage. Experimental results show that the density ratio (N) and temperature ratio (T) of the two electron groups can be controlled by changing the voltage applied to the magnetic cage. Out of the two groups of electrons, one group has

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Dewi, Herlina Arianita, Fanben Meng, Barindra Sana, et al. "Investigation of electron transfer from isolated spinach thylakoids to indium tin oxide." RSC Adv. 4, no. 90 (2014): 48815–20. http://dx.doi.org/10.1039/c4ra07070d.

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Bowen, Kit. "Interactions of electrons with isolated biomolecules." Nanomedicine: Nanotechnology, Biology and Medicine 2, no. 4 (2006): 296. http://dx.doi.org/10.1016/j.nano.2006.10.086.

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Izmailov, A. F., and A. R. Kessel’. "Solution of the problem of indirect interaction of localized magnetic moments through conduction electrons using the s–d exchange model." Soviet Journal of Low Temperature Physics 14, no. 3 (1988): 158–62. https://doi.org/10.1063/10.0031894.

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The path integration over the Grassmann algebra corresponding to the Fermi fields of conduction s-electrons has been used to obtain an exact expression for the effective Hamiltonian of localized d-electrons interacting with s-electrons in the s–d exchange model. In the weak magnetic field limit, the single- and double-spin terms of the effective Hamiltonian are isolated. The first of these contains static magnetization, while the second contains the indirect electron interaction potential.

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Boyd, John K. "Electron Spin Transition Solution Applicable to an Ensemble of Isolated Electrons." Journal of Magnetic Resonance 139, no. 1 (1999): 109–25. http://dx.doi.org/10.1006/jmre.1999.1770.

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Hirano, Shin-ichi, Sota Ihara, Satoshi Wakai, et al. "Novel Methanobacterium Strain Induces Severe Corrosion by Retrieving Electrons from Fe0 under a Freshwater Environment." Microorganisms 10, no. 2 (2022): 270. http://dx.doi.org/10.3390/microorganisms10020270.

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Methanogens capable of accepting electrons from Fe0 cause severe corrosion in anoxic conditions. In previous studies, all iron-corrosive methanogenic isolates were obtained from marine environments. However, the presence of methanogens with corrosion ability using Fe0 as an electron donor and their contribution to corrosion in freshwater systems is unknown. Therefore, to understand the role of methanogens in corrosion under anoxic conditions in a freshwater environment, we investigated the corrosion activities of methanogens in samples collected from groundwater and rivers. We enriched microor

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Aksnes, A., J. Stadsnes, J. Bjordal, et al. "Instantaneous ionospheric global conductance maps during an isolated substorm." Annales Geophysicae 20, no. 8 (2002): 1181–91. http://dx.doi.org/10.5194/angeo-20-1181-2002.

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Abstract. Data from the Polar Ionospheric X-ray Imager (PIXIE) and the Ultraviolet Imager (UVI) on board the Polar satellite have been used to provide instantaneous global conductance maps. In this study, we focus on an isolated substorm event occurring on 31 July 1997. From the PIXIE and the UVI measurements, the energy spectrum of the precipitating electrons can be derived. By using a model of the upper atmosphere, the resulting conductivity values are generated. We present global maps of how the 5 min time-averaged height-integrated Hall and Pedersen conductivities vary every 15 min during

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CARLI, TANCREDI, DOMINIK DANNHEIM, and LORENZO BELLAGAMBA. "EVENTS WITH ISOLATED CHARGED LEPTONS AND LARGE MISSING TRANSVERSE MOMENTUM AT HERA." Modern Physics Letters A 19, no. 25 (2004): 1881–902. http://dx.doi.org/10.1142/s0217732304015142.

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Striking events with isolated charged leptons, large missing transverse momentum and large transverse momentum of the hadronic final state [Formula: see text] were observed at the electron proton collider HERA in a data sample corresponding to an integrated luminosity of about 130 pb-1. The H1 collaboration observed 11 events with isolated electrons or muons and with [Formula: see text]. Only 3.4±0.6 events were expected from Standard Model (SM) processes. Six of these events have [Formula: see text], while 1.3±0.3 events were expected. The ZEUS collaboration observed good agreement with the S

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Arif, K., M. T. Meftah, K. Chenini, S. Douis, Y. Ben Nana, and H. Gossa. "Contribution of Liénard–Wiechert potential to the broadening of spectral lines by electron collisions in plasmas." Physics of Plasmas 29, no. 9 (2022): 093303. http://dx.doi.org/10.1063/5.0085698.

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In this work, we have calculated the relativistic collision operator representing the line broadening, by collision with free electrons, of isolated lines emitted by hydrogen-like ions (Ly- α line [Formula: see text]) of hydrogenic ions FeXXVI, CrXXIV, and CoXXVII in the temperature range of [Formula: see text] to [Formula: see text] and electron densities of 1021 to [Formula: see text]. To accomplish this task, we have considered the fine structure of these ions and taking into account the relativistic effects related to the free electrons. Specifically, two relativistic effects are considere

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DESFRANÇOIS, CHARLES, HASSAN ABDOUL-CARIME, and JEAN-PIERRE SCHERMANN. "GROUND-STATE DIPOLE-BOUND ANIONS." International Journal of Modern Physics B 10, no. 12 (1996): 1339–95. http://dx.doi.org/10.1142/s0217979296000520.

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Ground-state dipole-bound anions are fragile molecular species which excess electrons are almost entirely located in a very diffuse orbital outside the molecular frame. They can be created by attachment of very low energy electrons to polar molecules or small clusters which dipole moments are larger than a practical critical value of 2.5 D. They present analogies with Rydberg atoms and their geometrical structures are nearly identical to those of their neutral parents. Experimentally, dipole-binding of electrons to polar systems is a non-perturbative and reversible ionization process, in contr

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Furutani, Y., H. Totsuji, K. Mima, and H. Takabe. "Internal structure of a partially ionized heavy ion. Isolated ion model." Laser and Particle Beams 7, no. 3 (1989): 581–88. http://dx.doi.org/10.1017/s0263034600007552.

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An effective potential and an associated electron density in a partially ionized high-Z ion are evaluated within the framework of the Thomas–Fermi–Dirac–Weizsäcker statistical model of atoms. The results are then injected as an initial input into the one-electron Schrödinger equation, a procedure based on the density functional theory. The self-consistency between the two approaches is examined. For a partially ionized ion at zero and finite temperatures, a number of bound electrons is counted by a sum over the principal quantum number, which diverges due to the contribution from shallow bound

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MAMUN, A. A. "A new electrostatic mode in a dusty plasma due to dust charge fluctuation." Journal of Plasma Physics 75, no. 3 (2009): 389–93. http://dx.doi.org/10.1017/s0022377808007629.

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AbstractA dusty plasma consisting of cold and hot electrons, cold ions, and charge fluctuating isolated cold dust has been considered. It has been shown by a normal mode analysis that in such a dusty plasma there exists a new type of electrostatic perturbation mode due to the charge fluctuation of the isolated dust. The basic features of this new electrostatic perturbation mode, which are different from those of the electron-acoustic waves, have also been analytically identified. The implications of these results in both the space and laboratory dusty plasma conditions are briefly discussed.

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Zeng, Jiaolong, Chen Ye, Pengfei Liu, Cheng Gao, Yongjun Li, and Jianmin Yuan. "The Strong Enhancement of Electron-Impact Ionization Processes in Dense Plasma by Transient Spatial Localization." International Journal of Molecular Sciences 23, no. 11 (2022): 6033. http://dx.doi.org/10.3390/ijms23116033.

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Recent experiments have observed much higher electron–ion collisional ionization cross sections and rates in dense plasmas than predicted by the current standard atomic collision theory, including the plasma screening effect. We suggest that the use of (distorted) plane waves for incident and scattered electrons is not adequate to describe the dissipation that occurs during the ionization event. Random collisions with free electrons and ions in plasma cause electron matter waves to lose their phase, which results in the partial decoherence of incident and scattered electrons. Such a plasma-ind

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Ishii, Shuya, Seiichi Saiki, Shinobu Onoda, Yuta Masuyama, Hiroshi Abe, and Takeshi Ohshima. "Ensemble Negatively-Charged Nitrogen-Vacancy Centers in Type-Ib Diamond Created by High Fluence Electron Beam Irradiation." Quantum Beam Science 6, no. 1 (2021): 2. http://dx.doi.org/10.3390/qubs6010002.

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Electron beam irradiation into type-Ib diamond is known as a good method for the creation of high concentration negatively-charged nitrogen-vacancy (NV−) centers by which highly sensitive quantum sensors can be fabricated. In order to understand the creation mechanism of NV− centers, we study the behavior of substitutional isolated nitrogen (P1 centers) and NV− centers in type-Ib diamond, with an initial P1 concentration of 40–80 ppm by electron beam irradiation up to 8.0 × 1018 electrons/cm2. P1 concentration and NV− concentration were measured using electron spin resonance and photoluminesce

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Holmes, Dawn E., Julie S. Nicoll, Daniel R. Bond, and Derek R. Lovley. "Potential Role of a Novel Psychrotolerant Member of the Family Geobacteraceae, Geopsychrobacter electrodiphilus gen. nov., sp. nov., in Electricity Production by a Marine Sediment Fuel Cell." Applied and Environmental Microbiology 70, no. 10 (2004): 6023–30. http://dx.doi.org/10.1128/aem.70.10.6023-6030.2004.

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ABSTRACT Previous studies have shown that members of the family Geobacteraceae that attach to the anodes of sediment fuel cells are directly involved in harvesting electricity by oxidizing organic compounds to carbon dioxide and transferring the electrons to the anode. In order to learn more about this process, microorganisms from the anode surface of a marine sediment fuel cell were enriched and isolated with Fe(III) oxide. Two unique marine isolates were recovered, strains A1T and A2. They are gram-negative, nonmotile rods, with abundant c-type cytochromes. Phylogenetic analysis of the 16S r

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Fedorovich, Viatcheslav, Matthew C. Knighton, Eulyn Pagaling, F. Bruce Ward, Andrew Free, and Igor Goryanin. "Novel Electrochemically Active Bacterium Phylogenetically Related to Arcobacter butzleri, Isolated from a Microbial Fuel Cell." Applied and Environmental Microbiology 75, no. 23 (2009): 7326–34. http://dx.doi.org/10.1128/aem.01345-09.

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ABSTRACT Exoelectrogenic bacteria are organisms that can transfer electrons to extracellular insoluble electron acceptors and have the potential to be used in devices such as microbial fuel cells (MFCs). Currently, exoelectrogens have been identified in the Alpha-, Beta-, Gamma- and Deltaproteobacteria, as well as in the Firmicutes and Acidobacteria. Here, we describe use of culture-independent methods to identify two members of the genus Arcobacter in the Epsilon p roteobacteria that are selectively enriched in an acetate-fed MFC. One of these organisms, Arcobacter butzleri strain ED-1, assoc

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Lubchich, A. A., A. G. Yahnin, E. E. Titova, et al. "Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions." Annales Geophysicae 24, no. 10 (2006): 2667–84. http://dx.doi.org/10.5194/angeo-24-2667-2006.

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Abstract. Using the data from satellite CRRES and three geostationary LANL spacecraft, the propagation of an electron cloud from midnight to the evening sector is investigated. An electron cloud was injected during a weak isolated substorm that developed on a quiet geomagnetic background. It is found that within the local time sector from 03:00 until at least 08:00 MLT, the propagation of electrons at perpendicular pitch-angles is well described by a simple model of drift in the dipole magnetic field. The flux levels in the field-aligned electrons increase simultaneously with the flux at perpe

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Lazuchenkov, D. N., and N. M. Lazuchenkov. "Mathematical modeling of probe measurements in a supersonic flow of a four-component collisionless plasma." Technical mechanics 2020, no. 4 (2020): 97–109. http://dx.doi.org/10.15407/itm2020.04.097.

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The aim of this work is the development of a procedure for extracting the plasma electron density and temperature and ion composition from the current-voltage characteristic (C –V characteristic) of an isolated probe system of cylindrical electrodes. The plasma is four-component and consists of electrons, ions of two species with significantly different masses, and neutrals. The measuring probe and the reference electrode of the probe system may be made up of several cylinders. The electrodes of the probe system are placed transversely to a supersonic flow of a low-temperature collisionless pl

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Kato, Souichiro, Isao Yumoto, and Yoichi Kamagata. "Isolation of Acetogenic Bacteria That Induce Biocorrosion by Utilizing Metallic Iron as the Sole Electron Donor." Applied and Environmental Microbiology 81, no. 1 (2014): 67–73. http://dx.doi.org/10.1128/aem.02767-14.

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ABSTRACTCorrosion of iron occurring under anoxic conditions, which is termed microbiologically influenced corrosion (MIC) or biocorrosion, is mostly caused by microbial activities. Microbial activity that enhances corrosion via uptake of electrons from metallic iron [Fe(0)] has been regarded as one of the major causative factors. In addition to sulfate-reducing bacteria and methanogenic archaea in marine environments, acetogenic bacteria in freshwater environments have recently been suggested to cause MIC under anoxic conditions. However, no microorganisms that perform acetogenesis-dependent M

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Malosso, Cesare, Gaetano Senatore, and Stefania De Palo. "Quadriexciton Binding Energy in Electron–Hole Bilayers." Condensed Matter 8, no. 2 (2023): 44. http://dx.doi.org/10.3390/condmat8020044.

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Excitonic condensation and superfluidity have recently received a renewed attention, due to the fabrication of bilayer systems in which electrons and holes are spatially separated and form stable pairs known as indirect excitons. Dichalcogenides- and graphene-based bilayers are nowadays built and investigated, giving access to systems with (i) only spin degeneracy and (ii) spin and valley degeneracy. Simulation studies performed in the last decades at T=0 for simple, model electron–hole bilayers, as function of the interlayer distance and in-layer carrier density, have revealed in case (i) the

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Colavecchia, F. D., G. Gasaneo, and D. Mitnik. "Double Photoionization of Endohedrally Confined Atoms." Journal of Atomic, Molecular, and Optical Physics 2011 (December 27, 2011): 1–6. http://dx.doi.org/10.1155/2011/817034.

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We study the double electronic emission by photon impact from ground state of two-electron atoms in the center of a model spherical fullerene, which is described by a square-well shell. Cross-sections for different well depth are computed within a separable model for the final state, and a configuration interaction state for the initial one. Triple differential cross-sections show a strong dependence on the well depth and on the energy of the emitted electrons, due to the delocalization of the electrons in the initial state. The fullerene potential also allows higher angular momenta partial wa

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Arora, Jaspreet, and P. V. Sane. "Histidyl Residues Mediate Electron Transport in Plant Mitochondria." Zeitschrift für Naturforschung C 44, no. 5-6 (1989): 537–42. http://dx.doi.org/10.1515/znc-1989-5-630.

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Abstract Plant The effect of chemical modification of histidyl residues using diethyl pyrocarbonate (DEP) on plant mitochondrial electron transport was studied. Mitochondrial membranes from potato tubers were isolated and electron flow from NADH to oxygen, NADH to ferricyanide and ascorbate to oxygen were monitored in pro», nee and/or absence of DEP. Measurements were made at various concentrations of DEP and at different pHs either by using an oxygen electrode or spectro-photometrically. The results show that DEP inhibits flow of electrons from NADH to oxygen, however partial electron transpo

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Agostino, L., G. Daskalakis, P. Govoni, L. Malgeri, and M. Paganoni. "Inter-calibration of the CMS electromagnetic calorimeter with isolated electrons." Journal of Physics G: Nuclear and Particle Physics 34, no. 3 (2007): N67—N83. http://dx.doi.org/10.1088/0954-3899/34/3/n02.

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Datsyuk, Vitaly V., and Iryna V. Ivanytska. "Statistical Properties of Conduction Electrons in an Isolated Metal Nanosphere." Journal of Statistical Physics 152, no. 5 (2013): 969–78. http://dx.doi.org/10.1007/s10955-013-0798-5.

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Tsuna, Daichi, and Norita Kawanaka. "Radio emission from accreting isolated black holes in our galaxy." Monthly Notices of the Royal Astronomical Society 488, no. 2 (2019): 2099–107. http://dx.doi.org/10.1093/mnras/stz1809.

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ABSTRACT Apart from the few tens of stellar-mass black holes discovered in binary systems, an order of 108 isolated black holes (IBHs) are believed to be lurking in our Galaxy. Although some IBHs are able to accrete matter from the interstellar medium, the accretion flow is usually weak and thus radiatively inefficient, which results in significant material outflow. We study electron acceleration generated by the shock formed between this outflow and the surrounding material, and the subsequent radio synchrotron emission from accelerated electrons. By numerically calculating orbits of IBHs to

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Walker, S. N., M. A. Balikhin, H. St C. K. Alleyne, Y. Hobara, M. André, and M. W. Dunlop. "Lower hybrid waves at the shock front: a reassessment." Annales Geophysicae 26, no. 3 (2008): 699–707. http://dx.doi.org/10.5194/angeo-26-699-2008.

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Abstract. The primary process occurring at a collisionless shock is the redistribution of the bulk upstream energy into other degrees of freedom. One part of this process results in the acceleration of electrons at the shock front. Accelerated electrons are observed at the terrestrial and other planetary shocks, comets, and their effects are observed in astrophysical phenomena such as supernova remnants and jets in the form of X-ray bremsstrahlung radiation. One of the physical models for electron acceleration at supercritical shocks is based on low-hybrid turbulence due to the presence of ref

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Babenkov, Sergey, Marie Froidevaux, Peng Ye, et al. "Towards complete band structure of microscopic MoS₂ flakes." EPJ Web of Conferences 273 (2022): 01006. http://dx.doi.org/10.1051/epjconf/202227301006.

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The occupied and unoccupied electronic states of MoS2 monolayer isolated flake were studied using laboratory based photoemission electron microscope (PEEM) nanoESCA equipped with He-I photon source. PEEM real-space imaging allowed selecting the high quality flake. Altogether, the data will allow accurately recovering the band structures of MoS2. The band structures will be used in future pump-probe experiments to explore the dynamics of electrons in the conduction band and photo-induced multitopological states using trefoil polarization.

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Suzuki, Chihiro, Fumihiro Koike, Izumi Murakami, Tetsutarou Oishi, and Naoki Tamura. "Spectra of Ga-Like to Cu-Like Praseodymium and Neodymium Ions Observed in the Large Helical Device." Atoms 9, no. 3 (2021): 46. http://dx.doi.org/10.3390/atoms9030046.

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Extreme ultraviolet (EUV) spectra of highly charged praseodymium (Pr) and neodymium (Nd) ions have been investigated in optically thin high-temperature plasmas produced in the Large Helical Device (LHD), a magnetically confined torus device for fusion research. Discrete spectral lines emitted mainly from highly charged ions having 4s or 4p outermost electrons were observed in plasmas with electron temperatures of 0.8–1.8 keV. Most of the isolated lines of Ga-like to Cu-like Nd ions were identified by a comparison with the recent data recorded in an electron beam ion trap (EBIT). The isolated l

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Kimura, Shigeo S., Kazumi Kashiyama, and Kenta Hotokezaka. "Multiwavelength Emission from Magnetically Arrested Disks around Isolated Black Holes." Astrophysical Journal Letters 922, no. 1 (2021): L15. http://dx.doi.org/10.3847/2041-8213/ac35dc.

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Abstract We discuss the prospects for identifying the nearest isolated black holes (IBHs) in our Galaxy. IBHs accreting gas from the interstellar medium likely form magnetically arrested disks (MADs). We show that thermal electrons in the MADs emit optical signals through the thermal synchrotron process while nonthermal electrons accelerated via magnetic reconnections emit a flat-spectrum synchrotron radiation in the X-ray to MeV gamma-ray ranges. The Gaia catalog will include at most a thousand IBHs within ≲1 kpc that are distributed on and around the cooling sequence of white dwarfs (WDs) in

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Alpana, K. Gupta, and S. Sindal Rajendra. "Comparative voltammetric behaviour of isatin and some of its Schiff bases at a solid electrode." Journal of Indian Chemical Society Vol. 85, Apr 2008 (2008): 417–24. https://doi.org/10.5281/zenodo.5814956.

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Department of Chemistry, Jai Narayan Vyas University, Jodhpur-342 001, Rajasthan, India <em>E-mail : </em>alpanakr@rediffmail.com <em>Manuscript received 20 September 2007, revised 17 December 2007, accepted 17 December 2007</em> The electrochemical behaviour of isatin (1) and its Schiff base, 3-arylimino-2<em>H</em>-indol-2-ones (2a-g), has been investigated and compared using cyclic (CV) and differential pulse voltammetry (DPV) techniques at glassy carbon electrode (GCE) in different solvent systems. CV of isatin (1) solution in DMF in 0.1 <em>M</em> LiCI showed two irreversible reduction st

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Brown, G. C., and M. D. Brand. "Proton/electron stoichiometry of mitochondrial complex I estimated from the equilibrium thermodynamic force ratio." Biochemical Journal 252, no. 2 (1988): 473–79. http://dx.doi.org/10.1042/bj2520473.

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The thermodynamic forces on electrons (delta Eh) and protons (delta p) across mitochondrial complexes I, III and IV were measured in isolated mitochondria respiring on succinate. The force ratio (delta Eh/delta p) across complex I close to equilibrium was found to be about 2. The equilibrium force ratio across complex I was measured during sulphite oxidation and was again close to 2. These results indicate that the proton/electron stoichiometry of complex I is 2, in conditions of high protonmotive force.

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Rashba, Georgiy I. "Localization of electrons in the field of impurity atoms on the surface of a nanotube." Low Temperature Physics 49, no. 4 (2023): 392–97. http://dx.doi.org/10.1063/10.0017576.

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The localization of electrons in the field of isolated nonmagnetic impurity atoms on the surface of a nanotube is considered. A model of a Gaussian separable impurity potential capable of localizing an electron at any intensity is used. The positions of the local level are found. The positions of the resonances are found, their widths are estimated. It is shown that the positions of the resonances experience oscillations similar to the de Haas–van Alphen oscillations, when changing the radius of the tube.

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Song, Myeonghun, Minki Jeong, Byeongki Kang, et al. "Spin dynamics of isolated donor electrons in phosphorus-doped silicon from high-frequency electron spin resonance." Journal of Physics: Condensed Matter 22, no. 20 (2010): 206001. http://dx.doi.org/10.1088/0953-8984/22/20/206001.

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Rossie, B. B., T. L. Shofner, S. R. Brown, D. M. Shuttleworth, and D. Nguyen. "Chain Structure Defect Location by Focused Ion Beam Passive Voltage Contrast." Microscopy and Microanalysis 6, S2 (2000): 520–21. http://dx.doi.org/10.1017/s1431927600035091.

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Defects present in microelectronic devices are often present in test structures as well. This makes test structures useful in identifying defect mechanisms. Chain patterns consists of thousands of contacts and plugs in series. The presence of an open contact in a chain can be detected by a loss of electrical continuity. The specific site of an open contact is difficult to locate for further analysis.The application of the focused ion beam (FIB) for passive voltage contrast (PVC) provides an effective method for contact defect location. Once the defect is located the FIB facilitates efficient s

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Uchiyama, Taku, Kimio Ito, Koji Mori, Hirohito Tsurumaru, and Shigeaki Harayama. "Iron-Corroding Methanogen Isolated from a Crude-Oil Storage Tank." Applied and Environmental Microbiology 76, no. 6 (2010): 1783–88. http://dx.doi.org/10.1128/aem.00668-09.

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ABSTRACT Microbiologically influenced corrosion of steel in anaerobic environments has been attributed to hydrogenotrophic microorganisms. A sludge sample collected from the bottom plate of a crude-oil storage tank was used to inoculate a medium containing iron (Fe0) granules, which was then incubated anaerobically at 37°C under an N2-CO2 atmosphere to enrich for microorganisms capable of using iron as the sole source of electrons. A methanogen, designated strain KA1, was isolated from the enrichment culture. An analysis of its 16S rRNA gene sequence revealed that strain KA1 is a Methanococcus

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Manu, Gupta, Hemlata, Karnawat Romila, and S. Verma P. "Electrochemical reduction of 3-methyl-1-phenyl-3-hydroxytriazene and its copper complex." Journal of Indian Chemical Society Vol. 89, Nov 2012 (2012): 1525–30. https://doi.org/10.5281/zenodo.5771607.

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Department of Chemistry, University of Rajasthan, Jaipur-302 004, Rajasthan, India <em>E-mail</em> : manu2408@rediffmail.com <em>Manuscript received 20 September 2011, accepted 22 February 2012</em> 3-Methyl-1-phenyl-3-hydroxytriazene (MPHT) and its Cu complex were synthesized, purified and characterized by spectral techniques. The electrochemical reduction of MPHT was studied in aqueous methanolic solution containing BR buffer using DC-polarography and cyclic voltammetry. The DC-polarogram and cyclic voltammograms displayed only one reduction wave. The kinetic parameters have been evaluated.

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Lochmann, Christine, Thomas F. M. Luxford, Samanta Makurat, et al. "Low-Energy Electron Induced Reactions in Metronidazole at Different Solvation Conditions." Pharmaceuticals 15, no. 6 (2022): 701. http://dx.doi.org/10.3390/ph15060701.

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Metronidazole belongs to the class of nitroimidazole molecules and has been considered as a potential radiosensitizer for radiation therapy. During the irradiation of biological tissue, secondary electrons are released that may interact with molecules of the surrounding environment. Here, we present a study of electron attachment to metronidazole that aims to investigate possible reactions in the molecule upon anion formation. Another purpose is to elucidate the effect of microhydration on electron-induced reactions in metronidazole. We use two crossed electron/molecular beam devices with the

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Lever, Fabiano, Dennis Mayer, Jan Metje, et al. "Core-Level Spectroscopy of 2-Thiouracil at the Sulfur L1- and L2,3-Edges Utilizing a SASE Free-Electron Laser." Molecules 26, no. 21 (2021): 6469. http://dx.doi.org/10.3390/molecules26216469.

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In this paper, we report X-ray absorption and core-level electron spectra of the nucleobase derivative 2-thiouracil at the sulfur L1- and L2,3-edges. We used soft X-rays from the free-electron laser FLASH2 for the excitation of isolated molecules and dispersed the outgoing electrons with a magnetic bottle spectrometer. We identified photoelectrons from the 2p core orbital, accompanied by an electron correlation satellite, as well as resonant and non-resonant Coster–Kronig and Auger–Meitner emission at the L1- and L2,3-edges, respectively. We used the electron yield to construct X-ray absorptio

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Grotjohann, Norbert, David Messdaghi, and Wolfgang Kowallik. "Oxygen Uptake during Photosynthesis of Isolated Pea Chloroplasts." Zeitschrift für Naturforschung C 54, no. 3-4 (1999): 209–19. http://dx.doi.org/10.1515/znc-1999-3-411.

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Abstract Mass spectrometric analysis of the gas exchange of illuminated leaflets of 10-14 d old pea seedlings revealed not only 16O2-liberation from photosynthetic H216O-splitting, but also uptake of 18O2, applied to the gas phase of the reaction vessel. Isolated intact chloroplasts of such leaflets suspended in a medium containing NaHCO3 and glycerate 3-phosphate, on irradiation with blue (λ 448 nm) or red (λ 679 nm) light also produced 16O2 from water oxidation and consumed 18O2 from the gas phase. The two reactions were saturated at the same quantum fluence rates. Uptake of 18oxygen was not

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Simon, M. N., B. Y. Lin, and J. S. Wall. "Structural Analysis of Filaments Using the STEM." Microscopy and Microanalysis 6, S2 (2000): 862–63. http://dx.doi.org/10.1017/s1431927600036801.

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The Scanning Transmission Electron Microscope (STEM) facility at BNL is an NIH Biotechnology Research Resource and as such is available to users with suitable projects, free of charge. Currently, many of our users' projects involve studying the structures of a variety of filaments. Most of these are of biological origin, although a couple involve conducting polymers. The STEM has a long history of being used to study different types of filaments and resolving controversies about their structure.The mainstay of the STEM is mass analysis on unstained, isolated, freeze-dried samples. On these, th

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Davidson, John F., and Robert H. Schiestl. "Mitochondrial Respiratory Electron Carriers Are Involved in Oxidative Stress during Heat Stress inSaccharomyces cerevisiae." Molecular and Cellular Biology 21, no. 24 (2001): 8483–89. http://dx.doi.org/10.1128/mcb.21.24.8483-8489.2001.

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ABSTRACT In the present study we sought to determine the source of heat-induced oxidative stress. We investigated the involvement of mitochondrial respiratory electron transport in post-diauxic-phase cells under conditions of lethal heat shock. Petite cells were thermosensitive, had increased nuclear mutation frequencies, and experienced elevated levels of oxidation of an intracellular probe following exposure to a temperature of 50°C. Cells with a deletion in COQ7 leading to a deficiency in coenzyme Q had a much more severe thermosensitivity phenotype for these oxidative endpoints following h

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Neal, Sonya E., Deepa V. Dabir, Heather L. Tienson, et al. "Mia40 Protein Serves as an Electron Sink in the Mia40-Erv1 Import Pathway." Journal of Biological Chemistry 290, no. 34 (2015): 20804–14. http://dx.doi.org/10.1074/jbc.m115.669440.

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A redox-regulated import pathway consisting of Mia40 and Erv1 mediates the import of cysteine-rich proteins into the mitochondrial intermembrane space. Mia40 is the oxidoreductase that inserts two disulfide bonds into the substrate simultaneously. However, Mia40 has one redox-active cysteine pair, resulting in ambiguity about how Mia40 accepts numerous electrons during substrate oxidation. In this study, we have addressed the oxidation of Tim13 in vitro and in organello. Reductants such as glutathione and ascorbate inhibited both the oxidation of the substrate Tim13 in vitro and the import of

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Xiao, Yaozong, Chao Feng, and Bo Liu. "Generating Isolated Attosecond X-Ray Pulses by Wavefront Control in a Seeded Free-Electron Laser." Ultrafast Science 2022 (July 30, 2022): 1–8. http://dx.doi.org/10.34133/2022/9812478.

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We proposed a simple method based on the seeded free-electron laser (FEL) to generate fully coherent X-ray pulses with durations at dozens of attosecond level. The echo-enabled harmonic generation technique is utilized to generate the fully coherent laser pulse covering the water-window range. A wavefront rotation laser is adopted as the seed to tailor the longitudinal contour of the radiation pulse. Due to the sensitivity of seeded FEL to external lasers, this method can effectively inhibit the bunching of the adjacent regions while preserving an isolated bunching in the middle. Sending such

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Thorman, Rachel M., Ragesh Kumar T. P., D. Howard Fairbrother, and Oddur Ingólfsson. "The role of low-energy electrons in focused electron beam induced deposition: four case studies of representative precursors." Beilstein Journal of Nanotechnology 6 (September 16, 2015): 1904–26. http://dx.doi.org/10.3762/bjnano.6.194.

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Focused electron beam induced deposition (FEBID) is a single-step, direct-write nanofabrication technique capable of writing three-dimensional metal-containing nanoscale structures on surfaces using electron-induced reactions of organometallic precursors. Currently FEBID is, however, limited in resolution due to deposition outside the area of the primary electron beam and in metal purity due to incomplete precursor decomposition. Both limitations are likely in part caused by reactions of precursor molecules with low-energy (<100 eV) secondary electrons generated by interactions of the prima

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Walter, Peter, Micheal Holmes, Razib Obaid, et al. "The DREAM Endstation at the Linac Coherent Light Source." Applied Sciences 12, no. 20 (2022): 10534. http://dx.doi.org/10.3390/app122010534.

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Free-electron lasers (FEL), with their ultrashort pulses, ultrahigh intensities, and high repetition rates at short wavelength, have provided new approaches to Atomic and Molecular Optical Science. One such approach is following the birth of a photo electron to observe ion dynamics on an ultrafast timescale. Such an approach presents the opportunity to decipher the photon-initiated structural dynamics of an isolated atomic and molecular species. It is a fundamental step towards understanding single- and non-linear multi-photon processes and coherent electron dynamics in atoms and molecules, ul

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Wang, Weizhou, and Pavel Hobza. "Application of Berlin's Theorem to Bond-Length Changes in Isolated Molecules and Red- and Blue-Shifting H-Bonded Clusters." Collection of Czechoslovak Chemical Communications 73, no. 6-7 (2008): 862–72. http://dx.doi.org/10.1135/cccc20080862.

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The origin of the bond-length change in molecule or molecular cluster has been investigated at the MP2/aug-cc-pVDZ level of theory using the electrostatic potential or the electron density difference analysis method. Our results have clearly shown that the bond-length change of a chemical bond is determined mainly by the balance of the electrostatic forces exerted by electrons on the two nuclei. The factors that affect the balance of the electrostatic forces include four parts: (i) The abstraction of the electron density from Berlin's binding region between the two nuclei. (ii) The accumulatio

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Kobayashi, Yuzu, Misun Hong, Raymond Wong, Yasuyuki Yokota, Jun Takeya, and Yousoo Kim. "Redox Reactions of Isolated Ferrocene Derivatives Observed By Electrochemical Scanning Tunneling Microscope." ECS Meeting Abstracts MA2022-01, no. 50 (2022): 2109. http://dx.doi.org/10.1149/ma2022-01502109mtgabs.

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Redox reactions on electrode surfaces have been widely applied to fundamental technologies such as energy conversion and storage, metal refining, and electronics. Recently, it has become clear that local structures at the single-atom and single-molecule level affect the efficiency and selectivity of redox reactions [1]. EC-STM, a combination of scanning tunneling microscopy (STM) and electrochemical (EC) measurements, allows direct observation of electrochemical interfaces with high spatial resolution [2], and we aimed to observe the redox reactions of single molecules using this technique. As

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TEUFEL, STEFAN, and HERBERT SPOHN. "SEMICLASSICAL MOTION OF DRESSED ELECTRONS." Reviews in Mathematical Physics 14, no. 01 (2002): 1–28. http://dx.doi.org/10.1142/s0129055x02001077.

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We consider an electron coupled to the quantized radiation field and subject to a slowly varying electrostatic potential. We establish that over sufficiently long times radiation effects are negligible and the dressed electron is governed by an effective one-particle Hamiltonian. In the proof only a few generic properties of the full Pauli–Fierz Hamiltonian H PF enter. Most importantly, H PF must have an isolated ground state band for |p|<p c ≤∞ with p the total momentum and p c indicating that the ground state band may terminate. This structure demands a local approximation theorem, in the

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Nohl, H., A. V. Kozlov, L. Gille, and K. Staniek. "Cell respiration and formation of reactive oxygen species: facts and artefacts." Biochemical Society Transactions 31, no. 6 (2003): 1308–11. http://dx.doi.org/10.1042/bst0311308.

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It is generally taken as an established fact that mitochondrial respiration is associated with the generation of small amounts of ROS (reactive oxygen species). There are many arguments supporting this side activity. A major argument is the particular physico-chemical configuration of dioxygen, which prevents the transfer of a pair of electrons. Instead, oxygen is reduced by the successive transfer of single electrons, necessarily leading to intermediates with odd electrons. The high rate of turnover of oxygen in the respiratory chain in combination with the existence of single-electron carrie

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Milosavljević, A. R., P. Rousseau, A. Domaracka, B. A. Huber, and A. Giuliani. "Multiple electron capture from isolated protein poly-anions in collision with slow highly charged ions." Physical Chemistry Chemical Physics 19, no. 30 (2017): 19691–98. http://dx.doi.org/10.1039/c7cp02075a.

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