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Prabhin, V.S.,Jeyasubramanian, K.,Jeyaseeli Rashmi, I.,Hikku, G.S.,Veluswamy, Pandiyarasan,Cho, Byung Jin Elsevier 2018 Materials chemistry and physics Vol.220 No.-
<P><B>Abstract</B></P> <P>This paper deals with the fabrication of super capacitor electrode material employing a facile etching process followed by electrodeposition. Nanoporous gold current collector has been fabricated by chemically dealloying commercially available 18k gold having a composition of 74% Au, 24% Cu and 2% Ag, with dilute HNO<SUB>3</SUB> solution. Electrochemically deposited MnO<SUB>2</SUB> over the prepared porous Au electrode exhibits a very high specific capacitance value of 670 Fg<SUP>-1</SUP> which is about 1.65 times greater than that of MnO<SUB>2</SUB> coated over unetched Au electrode (407 Fg<SUP>-1</SUP>). Etched and unetched MnO<SUB>2</SUB> coated electrode materials are characterized using XRD, XPS, FESEM with EDAX and AFM. Electrochemical characterization of the obtained hybrid material is evaluated by running several cyclic voltagramms using electrochemical workstation. In contrast to the MnO<SUB>2</SUB> coated unetched Au hybrid electrode system, nanoporous AuMnO<SUB>2</SUB> electrode displays higher phase angle (79°) and lower time constant (2 ms) derived from the bode plot suggesting a better capacitance value. The high specific capacitances offered with good charge/discharge rates at a potential window of 0–0.8 V, in the scan rate of 100 mV/s for 1000 cycles, exhibiting high-energy storage density of 32.56 wh/kg and 53.6 wh/kg and power density of 366 w/kg and 603 w/kg for un-etched and etched electrodes respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MnO<SUB>2</SUB> is incorporated into porous and flat 18k Au substrates by bulk electrolysis. </LI> <LI> The MnO<SUB>2</SUB> depositions are characterized using XRD, XPS, FESEM, EDX mapping and AFM. </LI> <LI> Electrochemical analysis shows the high specific capacitance of the porous electrode. </LI> <LI> The impedance analysis suggests the superior characteristics of porous electrode. </LI> <LI> The prepared electrodes prove to be good candidate for high power applications. </LI> </UL> </P>
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Assessment of antibacterial activity of the cardiovascular drug nifedipine
Pal, Tapas,Dutta, Noton Kumar,Mazumdar, Kaushiki,Dasgupta, Asish,L., Jeyaseeli,Dastidar, Sujata G. Kyung Hee Oriental Medicine Research Center 2006 Oriental pharmacy and experimental medicine Vol.6 No.2
The cardiovascular drug nifedipine exhibited significant in vitro and in vivo antibacterial activity against 331 strains of bacteria belonging to three Gram-positive and twelve Gram-negative genera. The minimum inhibitory concentration of the drug, as determined both by agar and broth dilution methods, was seen to range from $25\;-\;200\;{\mu}g/ml$ against most test bacteria, including several pathogenic ones, in the in vitro studies. Nifedipine was bacteriostatic in action. in vivo studies with this drug showed that it could offer statistically significant protection (P < 0.001) to mice challenged with a virulent bacterium. Therefore, nifedipine has the potential of an antibacterial agent, which may be developed after further pharmacological studies.
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