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Guzii, Alla G.,Makarieva, Tatyana N.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Kuzmich, Aleksandra S.,Dyshlovoy, Sergey A.,von Amsberg, Gunhild,Krasokhin, Vladimir B.,Stonik, Valentin A. American Chemical Society 2016 ORGANIC LETTERS Vol.18 No.14
<P>Melonoside A (<B>1</B>), the first representative of a new class of ω-glycosylated fatty acid amides, was isolated from the Far Eastern marine sponge <I>Melonanchora kobjakovae</I>. The structure of <B>1</B>, including absolute configuration, was established using detailed analysis of 1D and 2D NMR, CD, and mass spectra as well as chemical transformations. Compound <B>1</B> induces autophagy of human cisplatin-resistant germinal tumor cells NCCIT-R.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2016/orlef7.2016.18.issue-14/acs.orglett.6b01678/production/images/medium/ol-2016-01678y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol6b01678'>ACS Electronic Supporting Info</A></P>
Hashemizadeh, Iman,Golovko, Vladimir B.,Choi, Jungkyu,Tsang, Daniel C.W.,Yip, Alex C.K. Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.347 No.-
<P><B>Abstract</B></P> <P>Artificial TiO<SUB>2</SUB> leaves with the morphology replicating that of <I>Camellia</I> tree leaves were synthesized through a multi-step bio-templating approach. Scanning and transmission electron microscopy images of the final products indicated that proposed method successfully replicates the highly porous structure of the leaf photosystem, down to the thylakoids. The hierarchical pore network and morphology of the bio-templated TiO<SUB>2</SUB> catalyst were demonstrated to be critical factors in successful photocatalytic reduction of CO<SUB>2</SUB> under UV (370 nm) and visible (515 nm) light. The artificial TiO<SUB>2</SUB> leaves increased the selectivity towards methane in CO<SUB>2</SUB> photoreduction compared with benchmark commercial catalyst under UV light. The new TiO<SUB>2</SUB> structures also outperformed the P25 titania by more than 1.35 times in terms of total product yield (CO + CH<SUB>4</SUB>) of under visible light. We hypothesized that modifying the morphology of the catalyst can alter the pathway and efficiency of photocatalytic reactions. Deposition of ruthenium dioxide on the surface of the new TiO<SUB>2</SUB> architecture showed further improvement in photocatalytic activity under both UV and visible light. The photocatalytic reduction of CO<SUB>2</SUB> coupled with the oxidative water splitting was also validated by kinetic modelling. The experimental data exhibited a very good fit to the pseudo first order kinetics. The understanding of the morphological contribution of the photocatalyst revealed in this study can help to augment the efficiency and selectivity of CO<SUB>2</SUB> photoreduction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bio-templated TiO<SUB>2</SUB> has mesoporous structure replicating pores in green leaves. </LI> <LI> The porous TiO<SUB>2</SUB> showed higher visible light photocatalytic activity than P25 TiO<SUB>2</SUB>. </LI> <LI> Bio-templated TiO<SUB>2</SUB> outperformed P25 TiO<SUB>2</SUB> in CO<SUB>2</SUB> reduction and ethanol reforming. </LI> <LI> Significant effect of morphology on the photocatalytic activity was demonstrated. </LI> <LI> Deposition of RuO<SUB>2</SUB> improved photocatalytic activity under UV and visible light. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jarvas, Gabor,Guttman, Andras,Mię,kus, Natalia,Bą,czek, Tomasz,Jeong, Sunkyung,Chung, Doo Soo,Pä,toprstý,, Vladimir,Masá,r, Mariá,n,Hutta, Milan,Datinská,, Vladim Elsevier 2020 Trends in analytical chemistry Vol.122 No.-
<P><B>Abstract</B></P> <P>By coupling a sample pretreatment technique of sample clean up and enrichment power with capillary electrophoresis (CE) of high-performance separation, the task of analyzing trace analytes in a complex matrix such as a biological sample can be carried out successfully with ease. This review aims for providing an overview of strategies to couple sample pretreatment techniques with capillary and related microscale (e.g., microchip) electrophoresis, practically adoptable in an automatic manner, without requiring serious modification of existing instruments to install sophisticated interfaces. In-line sample pretreatment techniques based on liquid phase microextraction performed before sample injection and on-line sample preconcentration techniques performed during or after sample injection are discussed with emphasis on the applicability to samples of high conductivity, commonly encountered for biological samples. An overview of the recent developments in microfluidic immobilized enzymatic microreactors which fit excellently to microchip CE is also given.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recent advances and major trends in sample pretreatment for capillary electrophoresis are summarized. </LI> <LI> In-line and on-line sample pretreatment techniques are discussed with emphasis on biological samples. </LI> <LI> We provide an overview of strategies to couple sample pretreatment techniques with capillary and microchip electrophoresis. </LI> </UL> </P>
Vladimir B. Dorokhov,Anton I. Taranov1,Anna M. Narbut,Dmitry S. Sakharov,Svetlana S. Gruzdeva,Olga N. Tkachenko,Gleb N. Arsen’ev,Ilya S. Blochin,Arcady A. Putilov 대한수면학회 2019 sleep medicine research Vol.10 No.2
Background and Objective Human brain appears to be able to absorb, detect, and respond to low-level extremely low-frequency electromagnetic fields (ELF EMF). Controlled laboratory studies on human sleep under exposure to such fields are scarce. Only sleep-disturbing effects on nighttime sleep were reported for frequencies of 50/60 Hz, while lower frequencies (i.e., below 20 Hz) have not been tested. These frequencies overlap with the frequency range of the electroencephalographic (EEG) signal, and sleep researchers utilized the specific frequency patterns (1–15 Hz) for subdivision of the sleep-wake state continuum into wake and sleep stages. In particular, the deepest sleep stage (N3) is characterized by slow-wave EEG activity (1–4 Hz) and serves as an electrophysiological indicator of sleep restorative function. We examined the effects of exposure to a low-level ELF EMF on sleep architecture in afternoon naps. Methods Ten polysomnographic sleep characteristics obtained during two naps of 23 healthy volunteers, either with or without exposure to a 1 Hz/0.004 μT electromagnetic field, were compared. Results The effect of the 1 Hz/0.004 μT electromagnetic field exposure on amount of stage N3 was not significant despite the overlap of this intervention frequency with the frequency of slow waves. However, the total duration of sleep was significantly increased due to a significant increase of amount of stage N2. Thus, the exposure to an extremely slow (1 Hz) electromagnetic field did not reveal any sleep-disturbing effects. Instead, total duration of sleep increased due to increase of N2 amount. Conclusions A sleep-promoting action of exposure to the low-level 1 Hz electromagnetic field cannot be excluded.
Korotcenkov, Ghenadii,Gulina, Larisa B.,Cho, Beongki,Brinzari, Vladimir,Tolstoy, Valery P. International Union of Pure and Applied Chemistry 2014 Pure and Applied Chemistry Vol. No.
<P><B>Abstract</B></P><P>The ability of successive ionic layer deposition (SILD) technology to synthesize gold clusters on the surface of tin(IV) oxide and indium(III) oxide films is discussed. It was shown that during the process, concentration of active sites that are capable of absorbing gold ions, and the size of the gold particles thus formed, may be controlled by both concentration of the solutions used and the number of SILD cycles. Thus, SILD methodology, employing separate and multiple stages of adsorption and reduction of adsorbed species, has considerable potential for customizing the properties of the deposited metal nanoparticles. In particular, it is shown that during the deposition of gold nanoparticles on the surface of tin(IV) oxide and indium(III) oxide films by SILD methodology, conditions can be realized under which the size of gold nanoclusters may be controllably varied between 1-3 nm and 50 nm. A model is proposed for the formation of gold clusters during the SILD process.</P>
Hybrid genetic-paired-permutation algorithm for improved VLSI placement
Ignatyev, Vladimir V.,Kovalev, Andrey V.,Spiridonov, Oleg B.,Kureychik, Viktor M.,Ignatyeva, Alexandra S.,Safronenkova, Irina B. Electronics and Telecommunications Research Instit 2021 ETRI Journal Vol.43 No.2
This paper addresses Very large-scale integration (VLSI) placement optimization, which is important because of the rapid development of VLSI design technologies. The goal of this study is to develop a hybrid algorithm for VLSI placement. The proposed algorithm includes a sequential combination of a genetic algorithm and an evolutionary algorithm. It is commonly known that local search algorithms, such as random forest, hill climbing, and variable neighborhoods, can be effectively applied to NP-hard problem-solving. They provide improved solutions, which are obtained after a global search. The scientific novelty of this research is based on the development of systems, principles, and methods for creating a hybrid (combined) placement algorithm. The principal difference in the proposed algorithm is that it obtains a set of alternative solutions in parallel and then selects the best one. Nonstandard genetic operators, based on problem knowledge, are used in the proposed algorithm. An investigational study shows an objective-function improvement of 13%. The time complexity of the hybrid placement algorithm is O(N2).
Rapid Ultrasensitive Single Particle Surface-Enhanced Raman Spectroscopy Using Metallic Nanopores
Cecchini, Michael P.,Wiener, Aeneas,Turek, Vladimir A.,Chon, Hyangh,Lee, Sangyeop,Ivanov, Aleksandar P.,McComb, David W.,Choo, Jaebum,Albrecht, Tim,Maier, Stefan A.,Edel, Joshua B. American Chemical Society 2013 NANO LETTERS Vol.13 No.10
<P>Nanopore sensors embedded within thin dielectric membranes have been gaining significant interest due to their single molecule sensitivity and compatibility of detecting a large range of analytes, from DNA and proteins, to small molecules and particles. Building on this concept we utilize a metallic Au solid-state membrane to translocate and rapidly detect single Au nanoparticles (NPs) functionalized with 589 dye molecules using surface-enhanced resonance Raman spectroscopy (SERRS). We show that, due to the plasmonic coupling between the Au metallic nanopore surface and the NP, signal intensities are enhanced when probing analyte molecules bound to the NP surface. Although not single molecule, this nanopore sensing scheme benefits from the ability of SERRS to provide rich vibrational information on the analyte, improving on current nanopore-based electrical and optical detection techniques. We show that the full vibrational spectrum of the analyte can be detected with ultrahigh spectral sensitivity and a rapid temporal resolution of 880 μs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2013/nalefd.2013.13.issue-10/nl402108g/production/images/medium/nl-2013-02108g_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl402108g'>ACS Electronic Supporting Info</A></P>
Aleksey L. Izhutov,Valeriy V. Iakovlev,Andrey E. Novoselov,Vladimir A. Starkov,Aleksey A. Sheldyakov,Valeriy Yu Shiishin,Vladimir M. Kosenkov,Aleksandr V. Vatulin,Irina V. Dobrikova,Vladimir B. Suprun 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.7
The paper summarizes the irradiation test and post-irradiation examination (PIE) data for the U-Mo low-enriched fuel thatwas irradiated in the MIR reactor under the RERTR Program. The PIE data were analyzed for both full-size fuel rods andmini-rods with atomized powder dispersed in Al matrix as well as with additions of 2%, 5% and 13% of silicon in the matrixand ZrN protective coating on the fuel particles. The full-size fuel rods were irradiated up to an average burnup of ~ 60%235U; the mini-rods were irradiated to an averageburnup of ~ 85%235U. The presented data show a significant increase of the void fraction in the U-Mo alloy as the U-235burnup rises from ~ 40% up to ~ 85%. The effect of irradiation test conditions and U-235 burnup were analyzed with regard tothe formation of an interaction layer between the matrix and fuel particles as well as generation of porosity in the U-Mo alloy. Shown here are changes in distribution of U fission products as the U-235 burnup increases from ~ 40% up to ~ 85%.