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81.
Viktoriya Rumyantceva Valeriya Rumyantceva Yulia Andreeva Sofia Tsvetikova Anton Radaev Maria Vishnevskaya Vladimir Vinogradov Andrey S. Drozdov Elena Koshel 《International journal of molecular sciences》2021,22(12)
Biofilms are the reason for a vast majority of chronic inflammation cases and most acute inflammation. The treatment of biofilms still is a complicated task due to the low efficiency of drug delivery and high resistivity of the involved bacteria to harmful factors. Here we describe a magnetically controlled nanocomposite with a stimuli-responsive release profile based on calcium carbonate and magnetite with an encapsulated antibiotic (ciprofloxacin) that can be used to solve this problem. The material magnetic properties allowed targeted delivery, accumulation, and penetration of the composite in the biofilm, as well as the rapid triggered release of the entrapped antibiotic. Under the influence of an RF magnetic field with a frequency of 210 kHz, the composite underwent a phase transition from vaterite into calcite and promoted the release of ciprofloxacin. The effectiveness of the composite was tested against formed biofilms of E. coli and S. aureus and showed a 71% reduction in E. coli biofilm biomass and an 85% reduction in S. aureus biofilms. The efficiency of the composite with entrapped ciprofloxacin was higher than for the free antibiotic in the same concentration, up to 72%. The developed composite is a promising material for the treatment of biofilm-associated inflammations. 相似文献
82.
83.
Saleh Al-Takrouri Author Vitae Andrey V. Savkin Author Vitae 《Pattern recognition》2010,43(6):2054-2067
A new approach to texture recognition and inpainting problems is proposed. The approach is based on the robust model validation and state estimation techniques. The proposed solutions require the modeling of textures by using uncertain dynamical systems. We propose a new modeling method which is efficient in terms of computational and memory requirements. The main aspects of the modeling method include system identification and order reduction of marginally stable uncertain discrete-time systems. To demonstrate the results, both static-image textures and video textures (also known as dynamic textures) are considered. 相似文献
84.
Rationally based model for evaluating the optimal refrigerant mass charge in refrigerating machines 总被引:6,自引:0,他引:6
Naer Vjacheslav Andrey Rozhentsev Chi-Chuan Wang 《Energy Conversion and Management》2001,42(18):2083-2095
A rationally based algorithm was proposed to evaluate the optimal mass charge into refrigerating machines. The calculated results indicate that the system performance is strongly related to the refrigerant mass charge. In the early stage of the refrigerant charge process, a sharp rise of COP is observed. The COP reaches an optimal value for a specified refrigerant charge and shows a slight drop for a further increase of refrigerant charge. Calculated results reveal similar trends to those of experimental data. The analysis of the study can well interpret the cycle transformation subject to refrigerant mass charge. 相似文献
85.
86.
Daniel Andrey 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1987,185(1):21-23
Summary Ethylcarbamate is a toxic component of certain spirits. For its determination, the spirit is concentrated to one-fifth of its volume, extracted with ethylacetate and analysed by capillary gas chromatography (GC) with flame ionization detection (FID). The method saves time and material and has proved to be a reliable test in different laboratories. The ethylcarbamate concentrations in 170 samples of Swiss origin are presented. the mean values were 1.0 mg/l in cherry brandies, 1.5 mg/l in plum brandies and 0.4 mg/l in Williams pear brandies. Ethylcarbamate concentrations may increase during storage, especially under the influence of daylight.
Eine einfache gaschromatographische Methode zur Bestimmung von Ethylcarbamat in Spirituosen
Zusammenfassung Ethylcarbamat ist ein cancerogener Inhaltsstoff von gewissen Spirituosen. Zu dessen Bestimmung wird die Probe auf 1/5 ihres Volumens eingeengt, mit Ethylacetat extrahiert und durch Capillar-GC mit FID nachgewiesen. Die Methode ist zeitund materialsparend und hat sich bei einem Vergleich mit mehreren Laboratorien als zuverlässig erwiesen. Die Ethylcarbamatgehalte von 170 Spirituosenproben aus der Innerschweiz werden angegeben. Dabei liegen die Mittelwerte für Kirschwasser bei 1,0 mg/l, für Zwetschgen- und Pflümliwasser bei 1,5 mg/1 und für Williamsbranntweine bei 0,4 mg/1. Die Ethylcarbamatgehalte von Spirituosen können bei der Lagerung stark zunehmen, dies vor allem unter dem Einfluß von Tageslicht.相似文献
87.
D Andrey 《Zeitschrift für Lebensmittel-Untersuchung und -Forschung》1987,185(1):21-23
Ethylcarbamate is a toxic component of certain spirits. For its determination, the spirit is concentrated to one-fifth of its volume, extracted with ethylacetate and analysed by capillary gas chromatography (GC) with flame ionization detection (FID). The method saves time and material and has proved to be a reliable test in different laboratories. The ethylcarbamate concentrations in 170 samples of Swiss origin are presented. The mean values were 1.0 mg/l in cherry brandies, 1.5 mg/l in plum brandies and 0.4 mg/l in Williams pear brandies. Ethylcarbamate concentrations may increase during storage, especially under the influence of daylight. 相似文献
88.
Sergey V. Dmitriev Takeshi Shigenari Kohji Abe Aleksey A. Vasiliev Andrey E. Miroshnichenko 《Computational Materials Science》2000,18(3-4):303-307
Phonon emission from a large-amplitude discrete sine-Gordon breather was studied numerically for a small degree of discreteness. In contrast to the case of highly discrete system investigated by Boesch and Peyrard (Phys. Rev. B 43 (1991) 8491), it was found that the resonance between the breather's oscillation and the phonons of the lower phonon band edge (κ=0) takes place for a small degree of discreteness. 相似文献
89.
90.
Sergey E. Kubatkin Andrey V. Danilov Håkan Olin Tord Cleason 《Journal of Low Temperature Physics》2000,118(5-6):307-316
Quench-condensed bismuth films of 3–5 nm thickness have beenused as a cluster source to prepare Single ElectronTransistors (SET) based on a single cluster with high chargingenergy. We used electron-beam defined shadow evaporation masksto pattern 10 nm wide constrictions in these films. Byincremental depositions through these masks controlled by insitu sample conductance measurements, we obtained a SETgeometry for clusters with charging energies up to 90 meV. Ourexperiment showed that the SET geometry can be achieved inevery sample preparation run, despite the apparent randomnature of cluster formation in granular films. The resultingcharging energy of the transistor varied from experiment toexperiment. Its value, however, was always higher than 10 meV. 相似文献