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1.
A. R.?Milosavljevic A.?Giuliani D.?Sevic M.-J.?Hubin-Franskin B. P.?MarinkovicEmail author 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2005,35(2):411-416
Absolute differential cross-sections (DCSs) for elastic
scattering of electrons from the DNA backbone sugarlike analogue
tetrahydrofuran (THF) molecule were determined using a crossed
beam measurements for incident energies from 20 eV to 300 eV and
scattering angles from 10o to 110o. Using the
relative-flow technique, elastic DCSs for THF relative to nitrogen
have been obtained at incident energies of 20, 30, 40, 50 and 60 eV. In the energy region above 30 eV, the DCSs were measured
independently as a function of both incident electron energy and
scattering angle. Therefore, this set of relative DCSs has been
calibrated to the absolute scale via normalization to a single
point in the overlapping region. Additionally, both vibrational
and electronic energy loss spectra for THF are presented and
influence of energy resolution to the obtained DCSs is discussed. 相似文献
2.
Ivan Gutman Natas?a Cmiljanovic Svetlana Milosavljevic Slavko Radenkovic 《Monatshefte für Chemie / Chemical Monthly》2004,42(3):765-772
In recent work [Gutman et al. (2004) Chem Phys Lett 383: 171] a method was developed by means of which the influence of non-bonding molecular orbitals (NBMOs) on the value of total -electron energy (E) can be separated from the multitude of other molecular-structure-dependent effects. We now extend this method and establish the relation between E and the number n
0 of NBMOs. It is shown that E (when computed within the HMO approximation, and expressed in the units of the HMO resonance integral ) is a decreasing function of n
0, and that the dependence of E on n
0 is almost perfectly linear. 相似文献
3.
Electrochemical Characterization of the Interaction of Multiwalled Carbon Nanotubes with Doxorubicin
Amitava Moulick Vedran Milosavljevic Hoai Viet Nguyen Pavel Kopel 《Analytical letters》2017,50(14):2335-2341
It has been suggested that multiwalled carbon nanotubes (MWCNTs) interacting with pharmaceutics may be introduced into the body as nanocarriers. To deliver the anticancer drugs, covalent or noncovalent functionalization of MWCNTs is required. In this study, the influence of oxidation on MWCNTs in the interaction with chemotherapeutic drug, doxorubicin, was characterized. The binding of doxorubicin with MWCNTs decreased rapidly with the increasing oxidation period with sulfuric acid. However, with nitric acid, the interaction increased initially and slowly decreased with time. The best results were obtained for sulfuric and nitric acid following 1 and 3?h of oxidation, respectively. The results show that sulfuric acid provided more favorable interaction for MWCNTs with doxorubicin than nitric acid. 相似文献
4.
A.?Giuliani P.?Lim?o-Vieira D.?Duflot A. R.?Milosavljevic B. P.?Marinkovic S. V.?Hoffmann N.?Mason J.?Delwiche M.-J.?Hubin-Franskin 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,51(1):97-108
The electronic spectroscopy of isolated tetrahydrofuran (THF) in the gas phase has been investigated using high-resolution
photoabsorption spectroscopy in the 5.8–10.6 eV with absolute cross-section measurements derived. In addition, an electron
energy loss spectrum was recorded at 100 eV and 10° over the 5–11.4 eV range. The He(I) photoelectron spectrum was also collected
to quantify ionisation energies in the 9–16.1 eV spectral region. These experiments are supported by the first high-level
ab initio calculations performed on the excited states of the neutral molecule and on the ground state of the positive ion.
The excellent agreement between the theoretical results and the measurements allows us to solve several discrepancies concerning
the electronic state spectroscopy of THF. The present work reconsiders the question of the lowest energy conformers of the
molecule and its population distribution at room temperature.
Electronic supplementary material Supplementary Online Material 相似文献
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The effect of high concentrations of large gold particles, in the hundreds of nanometer size regime, on the yields of molecular hydrogen, G(H(2)), produced in the radiolysis of several aqueous solutions was determined. In particular we look for direct effect of radiation absorbed by the solid particles on the yield of water products. These particles, however, are catalytically active in the conversion of reducing radicals to molecular hydrogen as well. A very small increase in G(H(2)) observed in bromide solutions upon addition of 50 wt % of gold particles indicates that the radiolysis of the solid particles does not affect the yields in the aqueous phase. Very little exchange of charge carriers or energy between the two phases occurs in these large particle suspensions. On the other hand, efficient catalytic conversion of (CH(3))(2)C(*)OH radicals to H(2) is shown to occur. The efficiency of the presently studied suspensions in the redox-catalytic process is similar to that of suspensions of small particles of similar total surface area. In the presence of radicals from hydrogen atom abstraction from tert-butyl alcohol the yield decreases significantly, again similar to the behavior in suspensions of small particles. We conclude that the redox catalysis does not depend on the size of the particles when their size exceeds a few nanometers. 相似文献
8.
A simple method is described for the simultaneous determination of free and complexed copper ions in a flow-injection system comprising ion-exchange and flame atomic absorption spectrometry. Sampling rates for 400-μl samples were 90 h?1. Typical relative standard deviations for the simultaneous determinations were 1.6% for the complexed metal (0.50 μg ml?1) and 1.0% for the free metal (0.20 μg ml?1). 相似文献
9.
Petr Michalek Simona Dostalova Hana Buchtelova Natalia Cernei Ludmila Krejcova David Hynek Vedran Milosavljevic Ana Maria Jimenez Jimenez Pavel Kopel Zbynek Heger Vojtech Adam 《Electrophoresis》2016,37(14):2025-2035
Annual epidemics of influenza cause death of hundreds of thousands people and they also have a significant economic impact. Hence, a need for fast and cheap influenza diagnostic method is arising. The conventional methods for an isolation of the viruses are time‐consuming and require expensive instrumentation as well as trained personnel. In this study, we modified the surface of nanomaghemite (γ‐Fe2O3) paramagnetic core with tetraethyl orthosilicate and (3‐aminopropyl)triethoxysilane and the resulting particles were utilized for the isolation of H7N7 influenza virions. Consequently, we designed γ‐Fe2O3 paramagnetic core modified with calcium tripolyphosphate which was employed for the isolation of viral nucleic acid after virion's lysis. Both of these procedures can be performed rapidly in less than 10 min and, in combination with the RT‐PCR, the whole influenza detection can be shortened to few hours. Moreover, the whole protocol could be easily automated and/or miniaturized, and thus can serve as a basis for use in a lab‐on‐a‐chip device. We assume that magnetic isolation is an exceptional procedure which can significantly accelerate the diagnostic possibilities of a broad spectrum of diseases. 相似文献
10.
Sulzer P Ptasinska S Zappa F Mielewska B Milosavljevic AR Scheier P Märk TD Bald I Gohlke S Huels MA Illenberger E 《The Journal of chemical physics》2006,125(4):44304
We study dissociative electron attachment to furan (FN) (C(4)H(4)O), tetrahydrofuran (THF) (C(4)H(8)O), and fructose (FRU) (C(6)H(12)O(6)) using crossed electron/molecular beams experiments with mass spectrometric detection of the anions. We find that FN and THF are weak electron scavengers and subjected to dissociative electron attachment essentially in the energy range above 5.5 eV via core excited resonances. In striking contrast to that, FRU is very sensitive towards low energy electrons generating a variety of fragment ions via a pronounced low energy feature close to 0 eV. These reactions are associated with the degradation of the ring structure and demonstrate that THF cannot be used as surrogate to model deoxyribose in DNA with respect to the attack of electrons at subexcitation energies (<3 eV). The results support the picture that in DNA the sugar moiety itself is an active part in the initial molecular processes leading to single strand breaks. 相似文献