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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>
Dmitry L. Aminin,Tatyana Y. Gorpenchenko,Viktor P. Bulgakov,Polina V. Andryjashchenko,Sergey A. Avilov,Vladimir I. Kalinin 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.6
Holothurian triterpene glycosides are known to possess multiple biological activities. Here we show that cucumarioside A_2-2 from the Far-Eastern edible holothurian Cucumaria japonica possesses potent immunomodulatory properties. The present studies were done to determine if cucumarioside A_2-2 would affect macrophage adhesion, spreading, and motility. Resident peritoneal macrophages, collected from BALB/c mice, were exposed in vitro to low concentrations of cucumarioside A_2-2 and compared with appropriate controls. Results indicate that 0.02 μg/mL cucumarioside A_2-2 significantly enhanced macrophage morphology parameters and behavior. The glycoside stimulated these parameters by increasing the number of cells with increased adhesion properties as well as the spreading reaction and motility velocity by at least almost twofold. The data are discussed in terms of possible mechanisms underlying the immunomodulatory properties of cucumarioside A_2-2.
Rakhimova Nailia R.,Morozov Vladimir P.,Eskin Aleksey A. 한국자원공학회 2021 Geosystem engineering Vol.24 No.5
The relevance of calcined clays as sources with a great potential for non-clinker alkali-activated materials has significantly increased in recent decades. This article reports on a study to investigate how NaOH with concentrations in the 5–14 M range affects the mechanical properties, amorphouscrystalline phase transformations, and reaction product composition of alkali-activated calcined kaolinite/montmorillonite cements with reactive phases of 60% and 33%, and with the SiO2/Al2O3 ratios of 1.54 and 1.74. The hardened pastes based on both calcined clays exhibited the highest compressive strength up to 9.1 MPa following their activation with 8 M NaOH. The higher amorphous fraction in the calcined clay provided gradual zeolitisation/crystallisation at Na2O/ SiO2 and Na2O/Al2O3 molar ratios in the 0.36–0.63 and 0.56–0.98 ranges, respectively, accompanied by the deterioration of the mechanical characteristics of the samples. The zeolite content in the alkali-activated calcined clay cements with an amorphous fraction of 33% peaked for NaOH at 11 M, and the corresponding molar ratios of Na2O/SiO2 and Na2O/Al2O3 were 0.85 and 1.46, respectively. The main reaction products in the studied systems determined by XRD, TG/DSC, and FTIR spectroscopy analyses were N-A-S-H and zeolite A. The properties and reaction products obtained favor the use of proposed alkali-activated cements for controlled low-strength materials.
Enhancement of the surface plasmon-polariton excitation in nanometer metal films
Kukushkin, Vladimir A.,Baidus, Nikoly V. Techno-Press 2014 Advances in nano research Vol.2 No.3
This study is aimed to the numerical modeling of the surface plasmon-polariton excitation by a layer of active (electrically pumped) quantum dots embedded in a semiconductor, covered with a metal. It is shown that this excitation becomes much more efficient if the metal has a form of a thin (with thickness of several nanometers) film. The cause of this enhancement in comparison with a thick covering metal film is the partial surface plasmon-polariton localized at the metal-semiconductor interface penetration into air. In result the real part of the metal+air half-space effective dielectric function becomes closer (in absolute value) to the real part of the semiconductor dielectric function than in the case of a thick covering metal film. This leads to approaching the point of the surface plasmon-polariton resonance (where absolute values of these parts coincide) and, therefore, the enhancement of the surface plasmon-polariton excitation. The calculations were made for a particular example of InAs quantum dot layer embedded in GaAs matrix covered with an Au film. Its results indicate that for the 10 nm Au film the rate of this excitation becomes by 2.5 times, and for the 5 nm Au film - by 6-7 times larger than in the case of a thick (40 nm or more) Au film.
Study of Catalysts for Catalytic Burners for Fuel Cell Power Plant Reformers
Ismagilov, Zinfer R.,Kerzhentsev, Mikhail A.,Sazonov, Vladimir A.,Tsykoza, Lidia T.,Shikina, Nadezhda V.,Kuznetsov, Vadim V.,Ushakov, Vladimir A.,Mishania, Sergey V.,Kozhukhar, Nikolay G.,Russo, Genna 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.3
Catalytic burners for fuel cell power plant reformers are alternatives to conventional flame burners. Their application is expected to provide uniform temperatures in the reformer, efficient use of low-calorific gaseous byproducts and reduction of pollutant emissions. For testing in the burners, a series of spherical Pd/CeO_2/Al_2O_3 catalysts were prepared. An optimum concentration of ceria providing the highest thermal stability of catalysts was determined. An effect of catalyst activation in the reaction mixture-1% methane in air was observed. A series of Mn containing oxide catalysts on spherical y-Al_2O_3 or (y+x)-Al_2O_3, both pure and doped with La, Ce and Mg oxides were prepared. The catalysts were characterized by chemical analysis, X-ray phase analysis, BET surface area and activity measurements in methane oxidation. A batch of Mn-Mg_La-Al-O catalyst was prepared for further long-term testing in a model reformer with a catalytic burner. A model reformer with a catalytic burner was designed and fabricated for testing in the composition of the bench-scale Fuel Cell Power Plant, Preliminary testing of this catalyst showed that it provided complete methane combustion an the specified operational temperatures over 900℃.
VLADIMIR M. MASALOV,ELENA A. KUDRENKO,NATALIA A. GRIGORYEVA,KSENIA V. EZDAKOVA,VLADIMIR V. RODDATIS,NADEZHDA S. SUKHININA,MIKHAIL V. AREFEV,ALEXANDER A. MISTONOV,SERGEI V. GRIGORIEV,GENNADI A. EMELCHE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.4
Ultramicrotomy was used to prepare a cross-section of shell-like amorphous SiO2 spherical particle synthesized by the multistage Stöber method which allowed performing first direct observations of the hierarchical structure of the SiO2 particle by transmission and scanning electron microscopy. The presence of primary, secondary and tertiary particles forming the inner structure of SiO2 spheres was established. The use of the small angle scattering of neutrons and synchrotron radiation techniques has enabled to define the size of the primary particles, the fractal parameters of their surface and the bulk density of the SiO2 spheres.
Brylev, Konstantin A.,Mironov, Yuri V.,Fedorov, Vladimir E.,Kim, Sung-Jin,Pietzsch, Hans-Jü,rgen,Stephan, Holger,Ito, Akitaka,Kitamura, Noboru Elsevier 2010 Inorganica chimica acta Vol.363 No.11
<P><B>Graphical abstract</B></P><P>A new hexanuclear anionic rhenium cluster complex [Re<SUB>6</SUB>S<SUB>8</SUB>(CH<SUB>3</SUB>COO)<SUB>6</SUB>]<SUP>4–</SUP> have been synthesized and characterized by X-ray single-crystal diffraction analysis, IR, <SUP>1</SUP>H NMR, UV/vis, and luminescence spectroscopies. The complex is the first demonstration of any chalcogenide hexanuclear clusters coordinated with acetic acid anions.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>A room-temperature reaction between [Re<SUB>6</SUB>S<SUB>8</SUB>(OH)<SUB>6</SUB>]<SUP>4−</SUP> and acetic acid in an aqueous solution resulted in the substitution of all terminal hydroxo groups by acetate ligands, affording a new hexanuclear anionic rhenium cluster complex [Re<SUB>6</SUB>S<SUB>8</SUB>(CH<SUB>3</SUB>COO)<SUB>6</SUB>]<SUP>4−</SUP>. The complex was isolated as a potassium salt with the composition of K<SUB>4</SUB>[Re<SUB>6</SUB>S<SUB>8</SUB>(CH<SUB>3</SUB>COO)<SUB>6</SUB>]·8H<SUB>2</SUB>O (<B>1</B>) and characterized by X-ray single-crystal diffraction and elemental analyses, IR, <SUP>1</SUP>H NMR, UV–Vis, and luminescence spectroscopies.</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.
Influence of the Dopant Concentration on the Photocatalytic Activity: Al-Doped TiO<sub>2</sub>
Murashkina, Anna A.,Murzin, Petr D.,Rudakova, Aida V.,Ryabchuk, Vladimir K.,Emeline, Alexei V.,Bahnemann, Detlef W. American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.44
<P>A set of Al-doped titania <I>x</I>-Al-TiO<SUB>2</SUB> (<I>x</I> = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.1 wt % Al) has been synthesized by a sol–gel method and tested in the reaction of the photocatalytic degradation of phenol in aqueous suspension. XRD and Raman studies show that the TiO<SUB>2</SUB> samples have a mixed-phase rutile-anatase crystalline structure with linear increase of the anatase fraction from 0.0 wt % for 0.0-Al-TiO<SUB>2</SUB> up to 18 wt % for 1.1-Al-TiO<SUB>2</SUB>. A decrease of the particle size from ∼800 to 50 nm and an increase of the specific surface area from 1.7 m<SUP>2</SUP>/g up to 28 m<SUP>2</SUP>/g with increased content of Al have been observed. The data of XRD, XPS, Raman spectroscopy, and EDS techniques show rather homogeneous aluminum distribution with only the Al(3+) oxidation state of aluminum incorporated in the TiO<SUB>2</SUB> lattice. The bandgap energy <I>E</I><SUB>g</SUB> = (2.93 ± 0.1) eV corresponding to indirect allowed transitions does not depend on the aluminum content within the 0.0–1.1 wt % Al concentration range. The photocatalytic testing of Al-doped TiO<SUB>2</SUB> samples in the reaction of phenol degradation shows the existence of a maximal initial rate of phenol degradation at an Al concentration of about 0.5 wt %.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-44/acs.jpcc.5b06252/production/images/medium/jp-2015-06252d_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5b06252'>ACS Electronic Supporting Info</A></P>
Pomogaev, Vladimir A.,Barachevsky, Valery A.,Tuktarov, Airat R.,Avramov, Pavel V.,Artyukhov, Victor Ya. American Chemical Society 2018 The journal of physical chemistry. A, Molecules, s Vol.122 No.2
<P>The photophysical and isomerization properties of hybrid molecular compounds that consist of photochromic nitro-substituted and halogenated spiropyran derivatives bonded to the surface of the [60]fullerene cage through the pyrrolidine bridge were investigated using various functionals and basis sets of TD-DFT and semiempirical quantum-chemical approaches. The role of <I>n</I>π* states formed by the lone pairs of substituents in changing of the electronic structure and photochromic properties of spiropyran derivatives was evaluated. The S<SUB>ππ</SUB>(spiropyran) → intermediate <I>n</I>π* states → S<SUB>ππ</SUB>(merocyanine) channel for phototransformation of the hybrid compound containing a nitro-substituted spiropyran moiety was established and compared with similar systems of halogenated spiropyrans attached to the [60]fullerene bulk where photoinduced isomerization does not process due to high probability of internal conversion from the excited electronic state localized on the spiropyran fragment to the states of the pyrrolidino[60]fullerene.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcafh/2018/jpcafh.2018.122.issue-2/acs.jpca.7b08374/production/images/medium/jp-2017-08374s_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp7b08374'>ACS Electronic Supporting Info</A></P>