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Varyambath, Anuraj,Kim, Mi-Ra,Kim, Il The Royal Society of Chemistry 2018 NEW JOURNAL OF CHEMISTRY Vol.42 No.15
<P>The use of renewable energy sources decreases the consequences of greenhouse gas emission from fossil fuels. Biodiesel, an easily burning and biodegradable fuel, is an alternative to conventional diesel fuel. The esterification of long-chain fatty acids and transesterification of triglycerides are two major reactions widely used to convert vegetable oils or animal fats into biodiesel. As solid acid catalysts are considered promising candidates for biodiesel production, we have synthesized a series of organic knitted porous polyaromatics (OPPs) using pyrene, anthracene, and naphthalene as monomers <I>via</I> Friedel-Crafts alkylation, followed by crosslinking reactions. The resultant polymers showed good surface morphology, stability and swelling property, high capacity for functionalization due to the unreacted bromomethyl groups on the surface, and excellent hydrophobicity. The sulfonated polymer microspheres obtained by the surface sulfonation showed good surface acidity; thus, they can be employed as heterogeneous solid acid catalysts for the esterification of long-chain fatty acids and transesterification of triglycerides, and they are reusable without any leaching of functional groups.</P>
Stimulated Raman forward scattering of laser in a pre-formed plasma channel
Panwar, Anuraj,Kumar, Ashok,Ryu, C.M. Cambridge University Press 2012 Laser and particle beams Vol.30 No.4
<B>Abstract</B><P>Stimulated Raman forward scattering (SRFS) of an intense short pulse laser in a plasma channel formed by two pre-laser pulses is investigated. The density nonuniformity of a plasma channel increases the focusing of main laser pulse. Main laser pulse excites a plasma wave and two electromagnetic sideband waves. Laser and the sidebands exert an axial ponderomotive force on electrons driving the plasma wave. The nonlinear currents arise at sideband frequencies. The density perturbation due to plasma wave beats with the oscillatory velocity due to pump to drive the sidebands. The normalized growth rate of SRFS increases with the density nonuniformity of a plasma channel. However, in the presence of a deep plasma channel the focusing is ineffective to laser intensity, but the growth rate increases with the intensity of main laser pulse.</P>
Modulational instability of a laser pulse in a non-uniform plasma channel
Panwar, Anuraj,Ryu, Chang-Mo,Kumar, Ashok Cambridge University Press 2016 Laser and particle beams Vol.34 No.1
<B>Abstract</B><P>A self-guided Gaussian laser pulse propagating in a non-uniform plasma channel is unstable to a plasma wave perturbation co-moving with the laser with its group velocity. The plasma wave amplitude has a maximum radial profile along the laser propagation axis. As the plasma wave propagates through a non-uniform plasma channel, the plasma wave perturbation causes focusing in the part of the laser that propagates with the electron density trough and defocusing in the part moving with the crest. This yields an axial gradient in the intensity of the laser and produces a ponderomotive force on the electrons. The ponderomotive force drives the plasma wave, which in turn makes the modulational instability grow. The growth rate of the modulational instability becomes larger with the increase in non-uniformity of a shallow plasma channel. In a deep cavitated plasma channel the growth rate of the modulational instability increases with the laser pulse amplitude.</P>
Huang, Xinhua,Varyambath, Anuraj,Kim, Mi Ri,Kim, Mi-Ra,Kim, Il American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>Herein, we report a facile technique for preparing a multicomponent electrocatalyst that has demonstrated promising activity in the electrooxidation of alcohol. The synthesis protocol involved the preparation of hyperbranched polynaphthalene (HPN) solid microspheres that were mixed with PdCl2, and subsequently reduced to Pd (0) using an aqueous NaBH4 solution. Finally, the HPN microsphere-supported palladium nanoparticles (Pd/HPNC) were obtained after undergoing thermal treatment. The unique porous construction of the microspheres resulted in higher surface area and lower resistance. The evaluation of the Pd/HPNC electrocatalyst showed improved performance, with a high degree of reaction efficiency.</P>
Praseetha, Sugathan,Bandaru, Srinivas,Nayarisseri, Anuraj,Sureshkumar, Sivanpillai Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.3
Alteration of the acetylation status of chromatin and other non-histone proteins by HDAC inhibitors has evolved as an excellent epigenetic strategy in treatment of cancers. The present study was sought to identify compounds with positive pharmacological profiles targeting HDAC1. Analogues of Vorinostat synthesized by Cai et al, 2015 formed the test compounds for the present pharmacological evaluation. Hydroxamte analogue 6H showed superior pharmacological profile in comparison to all the compounds in the analogue dataset owing to its better electrostatic interactions and hydrogen bonding patterns. In order to identify compounds with even better high affinity and pharmacological profile than 6H and Vorinostat, virtual screening was performed. A total of 83 compounds similar to Vorinostat and 154 compounds akin to analogue 6H were retrieved. SCHEMBL15675695 (PubCid: 15739209) and AKOS019005527 (PubCid: 80442147) similar to Vorinostat and 6H, were the best docked compounds among the virtually screened compounds. However, in spite of having good affinity, none of the virtually screened compounds had better affinity than that of 6H. In addition SCHEMBL15675695 was predicted to be a carcinogen while AKOS019005527 is Ames toxic. From, our extensive analysis involving binding affinity analysis, ADMET properties predictions and pharmacophoric mappings, we report Vorinostat hydroxamate analogue 6H to be a potential candidate for HDAC inhibition in treatment of cancers through an epigenetic strategy.
Kalla, Reddi Mohan Naidu,Varyambath, Anuraj,Kim, Mi Ri,Kim, Il Elsevier 2017 Applied Catalysis A Vol.538 No.-
<P><B>Abstract</B></P> <P>The hyper-crosslinked microporous polyphenanthrene spheres were fabricated simply by the polymerization of phenanthrene using bromomethyl methyl ether as a bridging agent in the absence of any templates. The organic spheres were subjected to amine-functionalizing on the periphery of them using unreacted bromomethyl groups. The amine-functionalized microporous polyphenthrene could be employed as a highly effective and stable solid basic catalyst for the syntheses of functionalized 2-amino-tetrahydro-4<I>H</I>-chromene and pyran derivatives. The significant features of these reactions are high product yields, environmental benignity, short reaction time, broad substrate scope, and non-requirement of toxic solvents. Furthermore, the catalyst can be reused up to four times without significant loss of activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Supported organo base-catalyzed syntheses of chromenes and pyrans are introduced. </LI> <LI> The reactions are eco-friendly, economically viable and versatile. </LI> <LI> The catalyst is reusable without losing its catalytic activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>