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排序方式: 共有66条查询结果,搜索用时 203 毫秒
51.
Wang D Yordanov S Paroor HM Mukhopadhyay A Li CY Butt HJ Koynov K 《Small (Weinheim an der Bergstrasse, Germany)》2011,7(24):3502-3507
The diffusion of nanoparticles at a water-alkane interface is studied using fluorescence correlation spectroscopy. Hydrophilic and hydrophobic quantum dots of 5, 8, and 11 nm radius are used. A slow-down of nanoparticle diffusion at the liquid-liquid interface is observed. The effect is most evident when the viscosities of both liquid phases are similar, here, at the water-decane interface. In this case, the interfacial diffusion coefficients of the hydrophilic particles are 1.5 times and those of the hydrophobic particles 2 times lower than the corresponding bulk values. 相似文献
52.
Tatiana Guzun-Cojocaru Chavdar Koev Martin Yordanov Thomas Karbowiak Eliane Cases Philippe Cayot 《Food chemistry》2011
Iron supplementation can promote oxidation of food matrices as well as cell lipids. The oxidative stability of oil/water emulsions stabilised by β-lactoglobulin (BLG) or sodium caseinate (SC) was studied in the presence of Fe-bisglycinate, NaFe-EDTA or FeSO4. Lipid oxidation was evaluated by following the peroxide value (PV) and the thiobarbituric acid reactive substances (TBARS) over 7 days. At pH 6.5, for Fe-bisglycinate iron complement, the oxidation kinetics was more reduced with BLG than with SC. Contrarily to BLG, SC possesses phosphate groups that have more affinity for iron ions than carboxylate residues. Both BLG and SC stabilised emulsions were more oxidised with Fe-bisglycinate or FeSO4 than with NaFe-EDTA. At pH 3.5, lipid oxidation was higher compared to pH 6.5. These results indicate that the competition for iron complexation between functional groups of protein and salt counter-ions (glycinate, sulphate or EDTA) appear as a key factor in oxidation. 相似文献
53.
A simple mathematical equation that can represent empirical I–V curves of individual solar cells, systems of solar cells and modules has been found. The basic model is determined by four parameters: the open circuit voltage, the short circuit current and two shape parameters. With the four parameters determined, the complete current–voltage curve, the fill factor and the maximum power point are given by simple analytical functions. The model is valid both in the positive and the negative (dark condition) voltage range. Several simple examples demonstrate some of the potential of the model. Due to its mathematical simplicity, it is suggested that the model will be suitable for analytical modeling of complex systems. 相似文献
54.
Vesselin Sinigersky Dessislava Budurova Hristo Penchev Filip Ublekov Ivan Radev 《应用聚合物科学杂志》2013,129(3):1223-1231
A new method for the preparation of polybenzimidazole (PBI)‐based membranes, containing high concentrations of immobilized phosphonic acid groups, has been developed. The procedure used is carried out in two steps: (1) Synthesis of modified PBIs, containing 1,2‐dihydroxypropyl groups and preparation of films there from; (2) Introduction of vinylphosphonic acid (VPA) and initiator (cerium ammonium nitrate) in the film, subsequent grafting of VPA from the active sites of the PBI backbone. Membranes with different length of the grafted polyvinylphosphonic acid chains were prepared. The molar ratio grafted VPA units per PBI repeating unit reaches 7.8. Proton conductivity was measured at 120°C and relative humidity (RH) 20–100%. For the membrane with highest concentration of phosphonic acid groups the proton conductivity was 35 mS cm?1 at 100% RH and 8 mS cm?1 at 20% RH. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献
55.
Hristo Bojinov 《Artificial Intelligence》2002,142(2):99-120
We demonstrate how multiagent systems provide useful control techniques for modular self-reconfigurable (metamorphic) robots. Such robots consist of many modules that can move relative to each other, thereby changing the overall shape of the robot to suit different tasks. Multiagent control is particularly well-suited for tasks involving uncertain and changing environments. We illustrate this approach through simulation experiments of Proteo, a metamorphic robot system currently under development. 相似文献
56.
Georgi G. Yordanov Gospodinka D. Gicheva Ceco D. Dushkin 《Materials Chemistry and Physics》2009,113(2-3):507-510
This work presents the observation of a photo-activated fluorescence from core/shell quantum dots of CdSe/CdS incorporated in a poly(butylmethacrylate) matrix. Upon illumination with UV-light, the intensity of fluorescence from the quantum dots increases as seen by naked eyes at ambient conditions. This allows its utilization in optical memory media based on thin films of CdSe/CdS polymer nanocomposites suitable for practical application. The quantum dots are synthesized by the hot-injection method and embedded in poly(butylmethacrylate) matrix by radical polymerization with 1,1′-azobis-(cyclohexanecarbonitrile). The fluorescence of quantum dots quenched during the polymerization process, but appeared again after illumination of the nanocomposite material with UV-light. The fluorescence properties of quantum dots are governed by the presence of trioctylphosphine oxide in the matrix, which allows control of the optical memory effect. 相似文献
57.
58.
Petko Alov Hristo Stoimenov Iglika Lessigiarska Tania Pencheva Nikolay T. Tzvetkov Ilza Pajeva Ivanka Tsakovska 《International journal of molecular sciences》2022,23(21)
The conventional treatment of neurodegenerative diseases (NDDs) is based on the “one molecule—one target” paradigm. To combat the multifactorial nature of NDDs, the focus is now shifted toward the development of small-molecule-based compounds that can modulate more than one protein target, known as “multi-target-directed ligands” (MTDLs), while having low affinity for proteins that are irrelevant for the therapy. The in silico approaches have demonstrated a potential to be a suitable tool for the identification of MTDLs as promising drug candidates with reduction in cost and time for research and development. In this study more than 650,000 compounds were screened by a series of in silico approaches to identify drug-like compounds with predicted activity simultaneously towards three important proteins in the NDDs symptomatic treatment: acetylcholinesterase (AChE), histone deacetylase 2 (HDAC2), and monoamine oxidase B (MAO-B). The compounds with affinities below 5.0 µM for all studied targets were additionally filtered to remove known non-specifically binding or unstable compounds. The selected four hits underwent subsequent refinement through in silico blood-brain barrier penetration estimation, safety evaluation, and molecular dynamics simulations resulting in two hit compounds that constitute a rational basis for further development of multi-target active compounds against NDDs. 相似文献
59.
Yan Chang Marah Funk Souvik Roy Elizabeth Stephenson Sangyong Choi Hristo V. Kojouharov Benito Chen Zui Pan 《International journal of molecular sciences》2022,23(3)
Targeting dysregulated Ca2+ signaling in cancer cells is an emerging chemotherapy approach. We previously reported that store-operated Ca2+ entry (SOCE) blockers, such as RP4010, are promising antitumor drugs for esophageal cancer. As a tyrosine kinase inhibitor (TKI), afatinib received FDA approval to be used in targeted therapy for patients with EGFR mutation-positive cancers. While preclinical studies and clinical trials have shown that afatinib has benefits for esophageal cancer patients, it is not known whether a combination of afatinib and RP4010 could achieve better anticancer effects. Since TKI can alter intracellular Ca2+ dynamics through EGFR/phospholipase C-γ pathway, in this study, we evaluated the inhibitory effect of afatinib and RP4010 on intracellular Ca2+ oscillations in KYSE-150, a human esophageal squamous cell carcinoma cell line, using both experimental and mathematical simulations. Our mathematical simulation of Ca2+ oscillations could fit well with experimental data responding to afatinib or RP4010, both separately or in combination. Guided by simulation, we were able to identify a proper ratio of afatinib and RP4010 for combined treatment, and such a combination presented synergistic anticancer-effect evidence by experimental measurement of intracellular Ca2+ and cell proliferation. This intracellular Ca2+ dynamic-based mathematical simulation approach could be useful for a rapid and cost-effective evaluation of combined targeting therapy drugs. 相似文献
60.
Ion beam synthesis of Mg2Si 总被引:2,自引:0,他引:2
E. Goranova B. Amov M. Baleva E. P. Trifonova P. Yordanov 《Journal of Materials Science》2004,39(5):1857-1859