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Gopal, Dhananjay,Hasan, Mohammad,Imdad, Mohammad Korean Mathematical Society 2012 대한수학회논문집 Vol.27 No.2
The purpose of this paper is to improve certain results proved in a recent paper of Soliman et al. [20]. These results are the outcome of utilizing the idea of absorbing pairs due to Gopal et al. [6] as opposed to two conditions namely: weak compatibility and the peculiar condition initiated by Pant [15] to ascertain the common fixed points of Lipschitzian mappings. Some illustrative examples are also furnished to highlight the realized improvements.
Gopal, Ramamourthy,Kim, Young Gwon,Lee, Jun Ho,Lee, Seog Ki,Chae, Jeong Don,Son, Byoung Kwan,Seo, Chang Ho,Park, Yoonkyung American Society for Microbiology 2014 Antimicrobial agents and chemotherapy Vol.58 No.3
<P>The increasing prevalence of drug-resistant pathogens highlights the need to identify novel antibiotics. Here we investigated the efficacies of four new antimicrobial peptides (AMPs) for potential drug development. The antibacterial activities, synergistic effects, and antibiofilm properties of the four chimeric AMPs were tested against <I>Acinetobacter baumannii</I>, an emerging Gram-negative, nosocomial, drug-resistant pathogen. Nineteen <I>A. baumannii</I> strains resistant to ampicillin, cefotaxime, ciprofloxacin, tobramycin, and erythromycin were isolated at a hospital from patients with cholelithiasis. All four peptides exhibited significant antibacterial effects (MIC = 3.12 to 12.5 μM) against all 19 strains, whereas five commercial antibiotics showed little or no activity against the same pathogens. An exception was polymyxin, which was effective against all of the strains tested. Each of the peptides showed synergy against one or more strains when administered in combination with cefotaxime, ciprofloxacin, or erythromycin. The peptides also exhibited an ability to prevent biofilm formation, which was not seen with cefotaxime, ciprofloxacin, or erythromycin, though polymyxin also inhibited biofilm formation. Indeed, when administered in combination with ciprofloxacin, the AMP HPMA exerted a potent synergistic effect against <I>A. baumannii</I> biofilm formation. Collectively, our findings indicate that the AMPs tested have no cytotoxicity but possess potent antibacterial and antibiofilm activities and may act synergistically with commercial antibiotics. </P>
Gopal Panthi,박수진,박미라,김학용 한국고분자학회 2014 Macromolecular Research Vol.22 No.8
In this study, a novel polyurethane (PU) nanofibrous mat doped with Ag-CoF NPs has been synthesized byelectrospinning technique in which the in situ reduction of Ag+ into Ag NPs was achieved by utilizing the reductionability of N,N-dimethylformamide (DMF), which played dual roles as a solvent and reducing agent. Typically, solgelconsisting of CoF/PU and AgNO3 was stirred for 3 h and electrospun. The crystalline structure and uniform distributionof Ag-CoF NPs in/on PU NFs were demonstrated by X-ray diffraction (XRD) and transmission electron microscopy(TEM), respectively. Two organic dyes, MB and RhB, were used to investigate the photocatalytic activity of the nanofibrousmat under visible light irradiation.
Gopal S. Mishra,Kelly Machado,Anil Kumar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A series of tricarbonyl Re(V) complexes, i.e. [Re(CO)3(k3-PN2)] (1), [Re(CO)3Br(k2-H2PNO)] (2), and [Re(CO)3Br(k2-HPN-Pip)] (3), have been covalently anchored over modified SBA-15 as supported catalysts. Remarkably, high catalytic turnover numbers from 2240 to 2857 with high ketone selectivity was obtained for both C5 and C6-alkanes. Best oxidation condition was optimized by the variation of temperature, pressure, time and catalyst amount. A thermal stability test indicates that the catalysts are stable up to 200 ℃ and ICP shows negligible metal loss from the catalyst surface, after the 7th catalytic cycle, allowing further use.
Gopal Panthi,박미라,김학용,박수진 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Use of nanostructured materials in powder form for various applications might show excellent performances, however they create serious problem due to separation difficulty, loss and photocorrosion during use, and their reusability in the case of large scale processes. This review presents the research that has been focused on the fabrication of composite NFs in which nanostructured materials are encapsulated in polymeric matrix by means of simple, effective, low cost, high yield technique; electrospinning in order to overcome the afore mentioned problems. Polymer NFs not only act as supporter but also prevent the aggregation and leaching of nanostructures improving their performances.
Gopal K.,Gupta D.N.,Jain A.,Hur M.S.,Suk H. 한국물리학회 2021 Current Applied Physics Vol.25 No.-
We investigate the parameters of accelerated electron bunch in laser wakefield acceleration (LWFA), when a skewed laser pulse propagates through a plasma in the presence of a transverse magnetic field. Two dimensional particle-in-cell (2D-PIC) simulations have been performed under the consideration of pulse skewness parameter (sα = τl/τt) that is defined as the ratio of leading (τl) to trailing pulse edge (τt) duration. The injected charge is estimated as 23 pC for the laser strength parameter a0 = 2 when sα changes from 1 to 0.45 at a laser propagation distance of 1.5 mm with 50T magnetic field. The electron beam emittance reduces about 50% when leading edge of the pulse becomes two-fold sharper (sα = 0.45) with 50T magnetic field. Energy spread of accelerated electron bunch is also reduced from 18 to 6.6%. Hence, in the presence of a transverse magnetic field, the laser pulse skewness can significantly improve the quality of the accelerated electron bunch (i.e. charge, mean energy and emittance) in laser wakefield acceleration.
Gopal SUBRAMANYA,Stephen C. BISHOP 한국곤충학회 2011 Entomological Research Vol.41 No.1
Three different races of lepidopteron silk moth Bombyx mori were used in reciprocal and inter se crosses to determine heterosis effects at F₁and recombination loss at the F₂generation for three fitness traits (fecundity, larval duration, survival rate) and four productivity traits (larval weight, cocoon weight, shell weight, filament length). Eleven mating types were represented in the present study, including three pure breeds and a variety of F₁and F₂populations arising from regular and reciprocal crosses, respectively. Equations were derived to evaluate heterosis, maternal and overdominance effects for the above traits. Estimates of heterosis and overdominance effects revealed significant heterosis effects for all the traits, but overdominance was only seen for larval duration (favorable effect) and survival rate (unfavorable effect). Maternal effects were significant for the majority of the traits under study. The results revealed significant reduction for all the quantitative traits from F₁to F₂, except for larval duration. The most obvious explanation for the reduction of fitness parameters and productive traits is the reduction in heterozygosity from F₁to F₂(it is expected that one half of the heterozygosity of F₁is lost in F₂). For larval duration this explanation seems insufficient and breakdown of epistatic gene effects (i.e. recombination loss) has been suggested.
Gopal Nagarajan,남명현,송정영,김홍기,Sung Woo Kang,Sung Joon Yoo 한국식물병리학회 2006 Plant Pathology Journal Vol.22 No.3
Twenty-two isolates of Fusarium oxysporum f. sp. fragariae were obtained from diseased strawberry plants and their characteristics were investigated by vegetative compatibility group (VCG), random amplified polymorphic DNA (RAPD), and pathogenicity. Three major VCGs (A, B, and C) and one incompatible group were identified by nitrate reductase complementation test. The virulence pattern of the 22 isolates was studied in relation to four cultivars including Dochiodome, Redpearl, Maehyang and Akihime. RAPD markers were used to determine genetic relationship, and created three major clusters among the 22 isolates of F. oxysporum f. sp. fragariae. Isolates belong to VCG-C were strongly pathogenic, and relatively high correlation was existed among VCG and RAPD, and virulence. In addition, VCG and RAPD pattern between pathogenic and non-pathogenic isolates were distinctly different.
Gopal Panthi,김학용,박미라,박수진 한국고분자학회 2015 Macromolecular Research Vol.23 No.2
This paper presents fabrication of polyacrylonitrile (PAN) electrospun nanofibers (NFs) reinforced withAg2CO3 nanoparticles (NPs) as highly efficient visible light photocatalyst. Preparation of the introduced NFs wasaccomplished by using simple, effective, high yield, and low cost process; electrospinning of Ag2CO3/PAN colloidal solutionat different applied electric voltages. Photocatalytic efficiency of the introduced nanofiber mats was investigatedby photodegradation of three dyes (Methyl orange, Methylene blue, and RhodamineB) under visible light irradiation. Experimental results indicated that the nanofiber mat obtained at applied electric voltage of 18 kV could showhigher performance towards the photodegradation of organic contaminants. Moreover, field emission scanning electronmicroscopy (FE-SEM) and transmission electron microscope (TEM) analysis confirmed the confinement ofAg2CO3 NPs inside polymeric NFs, which can overcome the serious problems of photocorrosion of photocatalystand secondary pollution. Overall, the introduced NFs can be used as efficient, low cost, and healthily safe visible lightdriven photocatalyst in the field of water treatment and can promote its industrial application, especially in the openwater surfaces.