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This article deals, the pulsating flow of blood carrying Au/CuO Oldroyd-B nanofluid through a porous channel with the effects of viscous dissipation, thermal radiation, and Joule (Ohmic) heating, and applied magnetic field. The perturbation technique is employed to get analytic solutions for flow variables.A comparison between analytical and numerical results shows a good agreement. The effect of various parameters is addressed extensively aided by pictorial results. The obtained results present that the velocity is reduced with the higher values of Hartmann number and volume fraction of nanoparticles. The temperature of nanofluid is enhanced with an enhancement of Eckert number and radiation parameter while it reduces with a rise in Hartmann number. Furthermore, the rise of the volume fraction of nanoparticles boosts up the rate of heat transfer.

The use of Boswellia ovalifoliolata bark extract for the synthesis of zinc oxide nanoparticles (ZnO NPs) with benefits of eco-friendliness, low cost and compatibility for pharmaceutical and biological applications. In this paper, we report the biosynthesis of zinc oxide nanoparticles using plant extract and its application for the detection of picric acid (PA). The synthesized ZnO nanoparticles were characterized using UV-Vis spectroscopy, scanning electron microscopy (SEM), X-ray diffraction pattern (XRD), fourier transform infrared spectroscopy (FT-IR) and fluorescene spectroscopy. ZnO NPs in aqueous solution shows maximum absorption bands at 278 nm and fluorescence emission at 317 nm. The fluorescence emission of zinc oxide nanoparticle shows high selectivity towards picric acid (PA) and can be used as a fluorescent probe for the detection of PA via fluorescence quenching mechanism. The fluorescence quenching mechanism of picric acid may be due to the electron transfer process between ZnO NPs and picric acid which is confirmed by cyclic voltammetry (CV). The quenching efficiency of nanoparticle was calculated using Stern-Volmer equation. The limit of detection was found to be 1.83 µM for picric acid. The fluorescence property of the ZnO NPs can be utilized for cell imaging application as biosensors and also in the field of drug delivery.