@article { ISI:000315751600033, title = {Probing interaction of Gram-positive and Gram-negative bacterial cells with ZnO nanorods}, journal = {Materials Science \& Engineering C-Materials for Biological Applications}, volume = {33}, number = {3}, year = {2013}, month = {APR}, pages = {1247-1253}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

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.

}, keywords = {Confocal, Growth curve, Nanorods, SEM, Zeta potential, ZnO}, issn = {0928-4931}, doi = {10.1016/j.msec.2012.12.019}, author = {Jain, Aanchal and Bhargava, Richa and Poddar, Pankaj} } @conference {46368, title = {Electrokinetic properties of PMAA functionalized NiFe2O4 nanoparticles synthesized by thermal plasma route}, booktitle = {Solid State Physics: Proceedings of the 58th Dae Solid State Physics Symposium 2013, PTS A \& B}, year = {2014}, month = {DEC}, publisher = {Board Res Nucl Sci; Dept Atom Energy; Govt India}, organization = {Board Res Nucl Sci; Dept Atom Energy; Govt India}, address = {2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA}, abstract = {

The magnetic nickel ferrite (NiFe2O4) nanoparticles with an average size of 30nm were synthesised by Transferred arc DC Thermal Plasma route. The synthesized nickel ferrite nanoparticles were characterized by TEM and FTIR techniques. The synthesized nickel ferrite nanoparticles were further functionalized with PMAA (polymethacrylic acid) by self emulsion polymerization method and subsequently were characterized by FTIR and Zeta Analyzer. The variation of zeta potential with pH was systematically studied for both PMAA functionalized (PNFO) and uncoated nickel ferrite nanoparticles (NFO). The IEP (isoelectric points) for PNFO and NFO was determined from the graph of zeta potential vs pH. It was observed that the IEP for NFO was at 7.20 and for PNFO it was 2.52. The decrease in IEP of PNFO was attributed to the COOH functional group of PMAA.

}, keywords = {IEP, NiFe2O4, PMAA, Thermal plasma, Zeta potential}, isbn = {978-0-7354-1225-5}, doi = {10.1063/14873080}, author = {Bhosale, Shivaji V. and Mhaske, Pravin and Kanhe, N. and Navale, A. B. and Bhoraskar, S. V. and Mathe, V. L. and Bhatt, S. K.}, editor = {Murli, C and Bhattacharyya, D and Gadkari, SC} } @article {48060, title = {Studies in instant water disinfection using natural oils}, journal = {Biochemical Engineering Journal}, volume = {187}, year = {2022}, month = {NOV}, pages = {108631}, type = {Article}, abstract = {

The present research reveals an instant and simple process for drinking water treatment by employing specific natural oils having antimicrobial properties to ensure complete elimination of harmful bacteria. The disinfection was studied for two different model bacteria, Gram-negative E. coli and Gram-positive, S. aureus. Seven natural oils, ajwain, thyme, oregano, peppermint, harsingar, cinnamon leaf and black pepper oil were evaluated and were found to yield 100\% water disinfection within 1 min except for harsingar and black pepper oil. The process was also effective for the instant and 100\% disinfection of real well water. The methodology for altering zeta potential, to an extent of 130\%, for instant disinfection in drinking water treatment helps in selecting natural oils. Molecular docking studies indicated natural oils action as potential inhibitors of bacterial DNA gyrase. The studies indicate one of the lowest operating costs comparable to conventional chlorination. The simple meth-odology not requiring complex equipment has the potential to provide many options for implementations-from portability, household application to large scale water treatment plants.

}, keywords = {Bacteria removal, Natural oil, Technology, Water treatment, Zeta potential}, issn = {1369-703X}, doi = {10.1016/j.bej.2022.108631}, author = {Dixit, Divya and Bhandari, Vinay M. and Mane, Maya B. and Balapure, Kshama} }