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Nejdl Lukas Zitka Jan Mravec Filip Milosavljevic Vedran Zitka Ondrej Kopel Pavel Adam Vojtech Vaculovicova Marketa 《Mikrochimica acta》2017,184(5):1489-1497
Microchimica Acta - The authors report on a systematic study on the low-cost, low-temperature, and fast synthesis of water soluble quantum dots (QDs) stabilized by mercaptosuccinic acid by UV... 相似文献
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Practical total syntheses of the natural products fuligocandin A (2a) and fuligocandin B (3) have been achieved through a convergent strategy depending on the Eschenmoser episulfide contraction as a key step. Conducting the reaction in DMSO proved to be an efficient and general method for the synthesis of a variety of vinylogous amides, such as azepan-2-ylidenepropan-2-one. 相似文献
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Rinea Barbir Walter Goessler Marija urlin Vedran Micek Mirta Mili Barbara Vukovi Marija Mili Marija Ljubojevi Darija Domazet Jurain Ivana Vinkovi Vr
ek 《Particle & Particle Systems Characterization》2019,36(8)
Exploitation of silver nanoparticles (AgNPs) in biomedicine represents more than one third of their overall applications. Despite their wide use, detailed toxicokinetic data and information on their action mechanisms in vivo are still scarce. One important obstacle is their fate and transformation patterns in biological environments where AgNPs get a “new face” after interaction with biomolecules, particularly proteins. The impact of protein corona on AgNP effects in vivo is eludicated. The in vivo effects of AgNPs prepared with two different protein coronas, albumin, and metallothionein, with polymer‐coated AgNPs are compared in male and female Wistar rats after intravenous administration. The results demonstrate that the character of the protein coronas on the AgNP surface affects not only distribution, but also oxidative stress response and genotoxicity in tissues of rat exposed to AgNPs. Additionally, sex‐related effects are observed. By emphasizing the importance of protein corona formation and sex‐related response, the obtained data support a reliable evidence base needed for assessing the health risks of the steadily increasing human exposure to AgNPs. 相似文献
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Vedran Milosavljevic Hoai Viet Nguyen Petr Michalek Amitava Moulick Pavel Kopel Rene Kizek Vojtech Adam 《Chemical Papers》2015,69(1):192-201
Nanoparticles as a progressively developing branch offer a tool for studying the interaction of carbon quantum dots (CQDs) with DNA. In this study, fluorescent CQDs were synthesized using citric acid covered with polyethylene glycol (PEG) as the source of carbon precursors. Furthermore, interactions between CQDs and DNA (double-stranded DNA and single-stranded DNA) were investigated by spectral methods, gel electrophoresis, and electrochemical analysis. Primarily, the fluorescent behavior of CQDs in the presence of DNA was monitored and major differences in the interaction of CQDs with tested single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) were observed at different amounts of CQDs (µg mL?1: 25, 50, 100, 250, 500). It was found that the interaction of ssDNA with CQDs had no significant influence on the CQDs fluorescence intensity measured at the excitation wavelengths of 280 nm, 350 nm, and 400 nm. However, in the presence of dsDNA, the fluorescence intensity of CQDs was significantly increased. Our results provide basic understanding of the interaction between CQDs and DNA. Such fabricated CQDs-DNA might be of great benefit for the emerging nanomaterials based biosensing methods. 相似文献
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Vedran Hasimbegovic Johnny Slätt Jan Bergman Tomasz Janosik 《Journal of heterocyclic chemistry》2007,44(5):1213-1217
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Xue-Qing Gong Navid Khorshidi Vedran Vonk Helmut Dosch Annabella Selloni Olga Dulub 《Surface science》2009,603(1):138-144
An extensive search for possible structural models of the (2 × 1)-reconstructed rutile TiO2(0 1 1) surface was carried out by means of density functional theory (DFT) calculations. A number of models were identified that have much lower surface energies than the previously-proposed ‘titanyl’ and ‘microfaceting’ models. These new structures were tested with surface X-ray diffraction (SXRD) and voltage-dependent STM measurements. The model that is (by far) energetically most stable shows also the best agreement with SXRD data. Calculated STM images agree with the experimental ones for appropriate tunneling conditions. In contrast to previously-proposed models, this structure is not of missing-row type; because of its similarity to the fully optimized brookite TiO2(0 0 1) surface, we call it the ‘brookite (0 0 1)-like’ model. The new surface structure exhibits two different types of undercoordinated oxygen and titanium atoms, and is, in its stoichiometric form, predicted to be rather inert towards the adsorption of probe molecules. 相似文献
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Sanja Singer Sa?a Singer Vedran Novakovi? Aleksandar U??umli? Vedran Dunjko 《Numerical Algorithms》2012,59(1):1-27
We describe two main classes of one-sided trigonometric and hyperbolic Jacobi-type algorithms for computing eigenvalues and
eigenvectors of Hermitian matrices. These types of algorithms exhibit significant advantages over many other eigenvalue algorithms.
If the matrices permit, both types of algorithms compute the eigenvalues and eigenvectors with high relative accuracy. We
present novel parallelization techniques for both trigonometric and hyperbolic classes of algorithms, as well as some new
ideas on how pivoting in each cycle of the algorithm can improve the speed of the parallel one-sided algorithms. These parallelization
approaches are applicable to both distributed-memory and shared-memory machines. The numerical testing performed indicates
that the hyperbolic algorithms may be superior to the trigonometric ones, although, in theory, the latter seem more natural. 相似文献
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