Davangere University

About: Davangere University is a education organization based out in Davangere, India. It is known for research contribution in the topics: Nanofluid & Heat transfer. The organization has 236 authors who have published 413 publications receiving 3673 citations.

A reliable technique for fractional modified Boussinesq and approximate long wave equations

Abstract: In this paper, an efficient technique is employed to study the modified Boussinesq and approximate long wave equations of the Caputo fractional time derivative, namely the q-homotopy analysis transform method. These equations play a vital role in describing the properties of shallow water waves through distinct dispersion relation. The convergence analysis and error analysis are presented in the present investigation for the future scheme. We illustrate two examples to demonstrate the leverage and effectiveness of the proposed scheme, and the error analysis is discussed to verify the accuracy. The numerical simulation is conducted to ensure the exactness of the future technique. The obtained numerical and graphical results are presented, the proposed scheme is computationally very accurate and straightforward to study and find the solution for fractional coupled nonlinear complex phenomena arising in science and technology.

Synthesis and Characterization of Endophytic Fungi, Cladosporium perangustum Mediated Silver Nanoparticles and their Antioxidant, Anticancer and Nano-toxicological Study

Abstract: In the present study, endophytic fungi, Cladosporium perangustum, water extract was used to analyze phytochemical by qualitative and GC-MS methods. Synthesis of the silver nanoparticles were characterized by UV-vis spectra, XRD, FTIR, DLS, EDX and SEM to know the biophysical properties and these were evaluated for antioxidant, anticancer and nano-toxicological studies. The endophytic fungal water extract yielded biologically important phytochemicals in qualitative method and the GC-MS yielded five different types of phytochemicals. The colour was changed to dark brown when silver nitrate incubated with C. perangustum water extract. Typical silver nanoparticle formations were confirmed using UV-visible spectra at 420 nm and were spherical shaped ranging size 30–40 nm. The CpAgNPs showed significant antioxidant activity compared with ascorbic acid and butylated hydroxytoluene in all the four methods (DPPH, scavenging activity of H2O2 and nitric oxide and reducing power). The CpAgNPs significantly reduced the viability of the MCF-7 cancer cell line and enhanced the caspase-3, caspase-7, caspase-8 and caspase-9 activities at the highest level, assumed to be CpAgNPs induce mitochondrial-mediated apoptosis. The CpAgNPs had cause cytotoxic effect on actively growing onion root tip cells by exhibiting different mechanism. But CpAgNPs had not inhibited the growth of green gram and also exhibited anti-hemolysis and heme-biocompatible activity on human blood RBCs. In all results, the study provided use of endophytic fungi C. perangustum in the synthesis of nanoparticles and their significant antioxidant, anticancer and nano-toxicological studies. The results are strong evidence to develop potential antioxidant and anticancer silver nanoparticles for commercial application.

Tumoricidal and Bactericidal Properties of ZnONPs Synthesized Using Cassia auriculata Leaf Extract.

Abstract: In this work, we aimed to synthesize zinc oxide nanoparticles (ZnONPs) using an aqueous extract of Cassia auriculata leaves (CAE) at room temperature without the provision of additional surfactants or capping agents The formation of as-obtained ZnONPs was analyzed by UV–visible (ultraviolet) absorption and emission spectroscopy, X-ray photoemission spectroscopy (XPS), X-ray diffraction analysis (XRD), energy dispersive X-ray diffraction (EDX), thermogravimetric analysis/differential thermal analysis (TGA-DTA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) The XRD results reflect the wurtzite structure of as-prepared ZnONPs, which produced diffraction patterns showing hexagonal phases The SEM images indicate that the morphology of as-prepared ZnONPs is composed of hexagonal nanostructures with an average diameter of 20 nm The HR-TEM result shows that the inter-planar distance between two lattice fringes is 0260 nm, which coincides with the distance between the adjacent (d-spacing) of the (002) lattice plane of ZnO The fluorescence emission spectrum of ZnONPs dispersed in ethanol shows an emission maximum at 569 nm, revealing the semiconductor nature of ZnO As-obtained ZnONPs enhanced the tumoricidal property of CAE in MCF-7 breast cancer cells without significant inhibition of normal human breast cells, MCF-12A Furthermore, we have studied the antibacterial effects of ZnONPs, which showed direct cell surface contact, resulting in the disturbance of bacterial cell integrity

Cattaneo–Christov heat flux model on Blasius–Rayleigh–Stokes flow through a transitive magnetic field and Joule heating

Abstract: This article addresses the Cattaneo–Christov heat flux, radiation and joule heating model as applied to a Blasius–Rayleigh–Stokes flow through a transitive magnetic field. The mathematical models are converted into a pair of self-similarity equations by applying appropriate transformations. The reduced similarity equivalences are then solved numerically by the Runge–Kutta–Fehlberg 45th-order method. To better perceive the problem, the flow and energy transfer characteristics are explored for distinct values of different factors. From this analysis we found that Higher values of Q increase the f ′ η field and its interrelated thickness of the boundary layer. The temperature of the fluid and its interrelated layer thickness enhances for boost up values of γ . Also found that the streamline graphs are dominant for Q=2 when compared with Q=0.5. The presence of Q has more impact on the results when compared to the case where Q is absent. The local R e x C f x and N u x R e x − 1 2 scale back for increasing values of ω .

Molecular Characterization of 2-Chlorobiphenyl Degrading Stenotrophomonas maltophilia GS-103

Abstract: The catabolic potential of transformer oil contaminated soil bacteria in aerobic degradation of polychlorinated biphenyls (PCB) were assessed. Transformer oil contaminated soil sample was subjected to microcosm enrichment experiments (PAS medium/biphenyl as sole carbon source). PCB-degrading activity of the enrichment cultures in PAS medium with the addition of 2-chlorobiphenyl were analysed by GC–MS indicated that, although the isolates differed in PCB-degrading capabilities, all of the enrichment cultures expressed activity toward at least some of the lower chlorinated congeners. Biphenyl-utilizing bacteria isolated from the most active PCB-degrading mixed cultures showed little taxonomic diversity and identified as Stenotrophomonas maltophilia GS-103.