Bishop Heber College

About: Bishop Heber College is a based out in . It is known for research contribution in the topics: Thin film & Band gap. The organization has 548 authors who have published 692 publications receiving 7144 citations.

Synergistic antibacterial activity of barium doped TiO2 nanoclusters synthesized by microwave processing

Abstract: In this work, we investigated the antibacterial activity of TiO2 and Ba doped TiO2 nanoparticles synthesised by a microwave assisted method. The obtained nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, ultra-violet visible spectroscopy, energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy. XRD patterns revealed preferentially oriented (101) TiO2 anatase phase, which changed to anatase–rutile mixed phase after Ba2+ doping. The vibrational spectra show significant shifts in the peaks with Ba addition, indicating the successful incorporation of Ba2+ ions into TiO2. The optical spectra revealed increase in band gap with Ba doping, thereby allowing the delay in recombination rate, favouring antibacterial activity. The surface morphology of TiO2 show spherical shaped grains with increased porosity after Ba doping. EDS analysis confirmed the phase-purity of the synthesized powders. The potential toxicity of nanosized TiO2 and Ba doped TiO2 were investigated using both Gram positive and Gram negative bacteria as test organisms. The antibacterial activity was found to be higher for Ba doped TiO2 nanoparticles compared to pure TiO2 nanoparticles, due to reduced particle size and high specific surface area leading to enhanced particle surface reactivity to light and H2O adsorption.

Naphthoquinone-Based Colorimetric and Fluorometric Dual-Channel Chemosensor for the Detection of Fe2+ Ion and Its Application in Bio-Imaging of Live Cells and Zebrafish

Abstract: A new naphthoquinone-based chemosensor 2-((3-hydroxyphenyl)amino)-3-(phenylthio)naphthalene-1,4-dione (2HPN) was successfully synthesized for the selective detection of Fe2+. The sensing property o...

Dynamics of lumps and dark–dark solitons in the multi-component long-wave–short-wave resonance interaction system

Abstract: General semi-rational solutions of an integrable multi-component (2+1)-dimensional long-wave-short-wave resonance interaction system comprising multiple short waves and a single long wave are obtained by employing the bilinear method. These solutions describe the interactions between various types of solutions, including line rogue waves, lumps, breathers and dark solitons. We only focus on the dynamical behaviours of the interactions between lumps and dark solitons in this paper. Our detailed study reveals two different types of excitation phenomena: fusion and fission. It is shown that the fundamental (simplest) semi-rational solutions can exhibit fission of a dark soliton into a lump and a dark soliton or fusion of one lump and one dark soliton into a dark soliton. The non-fundamental semi-rational solutions are further classified into three subclasses: higher-order, multi- and mixed-type semi-rational solutions. The higher-order semi-rational solutions show the process of annihilation (production) of two or more lumps into (from) one dark soliton. The multi-semi-rational solutions describe N(N≥2) lumps annihilating into or producing from N-dark solitons. The mixed-type semi-rational solutions are a hybrid of higher-order semi-rational solutions and multi-semi-rational solutions. For the mixed-type semi-rational solutions, we demonstrate an interesting dynamical behaviour that is characterized by partial suppression or creation of lumps from the dark solitons.

Decolorization and biodegradation of Indigo carmine by a textile soil isolate Paenibacillus larvae

Abstract: The potential of recently isolated bacteria Paenibacillus larvae for the effective decolorization of Indigo carmine was evaluated. The effects of operational parameters (temperature, pH, dye concentration, shaking/non shaking) were tested. Maximum extent of decolorization was observed when the medium was incorporated with 10 g/l of yeast extract and peptone. Decolorization was strongly inhibited at non-shaken conditions as well as incorporation of inorganic sources (sodium nitrite and ammonium chloride) in the medium. Maximum decolorization was observed at 30°C (100%) and 40°C (92%) at 8 h of incubation. The LC-MS and NMR analysis confirms the oxidation of Indigo carmine .The primary degradation products were found to be Isatin sulfonic acid and anthranilicacid.