02066nas a2200241   4500008004100000022001400041245009300055210006900148260007300217300001400290490000700304520125600311653001301567653001701580653001301597653000801610653001901618653000801637100001801645700002001663700001901683856012201702       2013                        eng d  a0928-493100aProbing interaction of Gram-positive and Gram-negative bacterial cells with ZnO nanorods0 aProbing interaction of Grampositive and Gramnegative bacterial c  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a1247-12530 v333 a<p>In the present work, the physiological effects of the ZnO nanorods on the Gram positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Escherichia coli and Aerobacter aerogenes) bacterial cells have been studied. The analysis of bacterial growth curves for various concentrations of ZnO nanorods indicates that Gram positive and Gram negative bacterial cells show inhibition at concentrations of similar to 64 and similar to 256 mu g/mL respectively. The marked difference in susceptibility towards nanorods was also validated by spread plate and disk diffusion methods. In addition, the scanning electron micrographs show a clear damage to the cells via changed morphology of the cells from rod to coccoid etc. The confocal optical microscopy images of these cells also demonstrate the reduction in live cell count in the presence of ZnO nanorods. These, results clearly indicate that the antibacterial activity of ZnO nanorods is higher towards Gram positive bacterium than Gram negative bacterium which indicates that the structure of the cell wall might play a major role in the interaction with nanostructured materials and shows high sensitivity to the particle concentration. (C) 2012 Elsevier B.V. All rights reserved.</p>10aConfocal10aGrowth curve10aNanorods10aSEM10aZeta potential10aZnO1 aJain, Aanchal1 aBhargava, Richa1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/probing-interaction-gram-positive-and-gram-negative-bacterial-cells-zno-nanorods-001963nas a2200181   4500008004100000022001400041245013500055210006900190260011000259300001600369490000600385520119500391100001801586700002001604700001401624700001901638856012401657       2013                        eng d  a2046-206900aStatic and dynamic magnetic properties and effect of surface chemistry on the morphology and crystallinity of DyCrO3 nanoplatelets0 aStatic and dynamic magnetic properties and effect of surface che  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT  a26427-264320 v33 a<p>In this contribution, the structural and magnetic properties of DyCrO3 nanoplatelets, synthesized by a hydrolytic sol-gel method, have been investigated. The crystalline phase of DyCrO3 was attained at the decomposition temperature of 800 degrees C for citric acid and oxalic acid, respectively and their structural analysis indicates a distorted orthorhombic perovskite structure of the DyCrO3 nanoplatelets. The dc-magnetization curve shows the Neel temperature of similar to 144 and similar to 146 K for DyCrO3 nanoplatelets synthesized using citric acid (DCO (C)) and oxalic acid (DCO (O)), respectively. In addition, DCO (O) shows weak anomalies at similar to 22 and similar to 6 K in the zero-field-cooled and field-cooled magnetization curves. Below the Neel temperature, DCO (C) and DCO (O) exhibit cross-over from positive to negative magnetization at similar to 143 and similar to 145 K, respectively. This was attributed to a Dy3+-Cr3+ interaction, which resulted in a weak ferromagnetic coupling (seen as a small opening in the M-H curves). The low temperature transition observed at similar to 6 K can be assigned to the onset of Dy3+-Dy3+ antiferromagnetic interaction.</p>1 aGupta, Preeti1 aBhargava, Richa1 aDas, Raja1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/static-and-dynamic-magnetic-properties-and-effect-surface-chemistry-morphology-and-002161nas a2200229   4500008004100000022001400041245016000055210006900215260000900284300001100293490000700304520132000311653001801631653002201649653002701671653002201698653002301720100001801743700002001761700001901781856013101800       2015                        eng d  a0022-372700aColossal increase in negative magnetization, exchange bias and coercivity in samarium chromite due to a strong coupling between Sm3+-Cr3+ spins sublattices0 aColossal increase in negative magnetization exchange bias and co  cJAN   a0250040 v483 a<p>We report giant temperature dependent negative magnetization (magnetization reversal) along with a large exchange bias and large coercivity in SmCrO3. The static magnetization measurements show the negative magnetization below similar to 192 K, due to competition between the external field, thermal activation energy and antiparallel Sm3+-Cr3+ spin interaction. At further lower temperatures, Sm3+ spins show an increased alignment due to the internal induced field of Cr3+ spins with minimum magnetization similar to - 0.037 emu g(-1). The temperature dependent exchange bias shows non-monotonic behavior. At 35 K, the exchange bias ceases to exist due to the orientation of Sm3+ moments with respect to canted Cr3+ moments. The crossover temperature decreases from similar to 191 K at 100 Oe to similar to 153 K at 250 Oe. The training effect further confirms the exchange bias in SmCrO3. The dynamic magnetization measurements exhibit anomalies around spin reorientation transition (T-SR similar to 34 K) and Neel transition (T-N similar to 192 K) which is consistent with static measurement and no frequency dependence was observed. The room temperature Raman spectra of SmCrO3 show peaks at similar to 364, similar to 375 and similar to 456 cm(-1) suggesting O-Cr-O bending modes within the octahedral.</p>10aexchange bias10amultiferroics etc10anegative magnetization10asamarium chromite10aspin reorientation1 aGupta, Preeti1 aBhargava, Richa1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/colossal-increase-negative-magnetization-exchange-bias-and-coercivity-samarium-chromite-due