Kuvempu University

About: Kuvempu University is a education organization based out in Shimoga, India. It is known for research contribution in the topics: Cyclic voltammetry & Carbon paste electrode. The organization has 1575 authors who have published 2210 publications receiving 39755 citations. The organization is also known as: KU.

Synthesis and Liquid Crystal Property of New Fluoro Coumarin Carboxylates

Abstract: New liquid crystalline 4-alkoxyphenyl-coumarin-3-carboxylates 6a–e, 7a–g, 8a–e, and 9a–e were prepared by reacting various coumarin-3-carboxylic acids 5a–d with 4-(alkoxy) phenols 4a–g in the presence of 1(3-dimethylaminopropyl-3-ethylcarbodiimide/dimethyl amino pyridine (EDCI/DMAP) as a coupling agent. The structures of the new coumarin derivatives were confirmed by spectral analysis and the liquid crystalline property was established by polarizing optical microscope and by differential scanning calorimetric techniques. The diethyl amine and morpholine were taken as electron-donating and –CF3 as electron-withdrawing groups at the seventh position of the coumarin-3-carboxylic acids to check the mesomorphic property in all new 4-alkoxyphenyl-coumarin-3-carboxylates. Among them, only 4-alkoxyphenyl-7-triflouromethyl-coumarin-3-carboxylates 7a–g exhibited liquid crystalline SmA phase.

Erratum to: The L1 Family of Cell Adhesion Molecules: A Sickening Number of Mutations and Protein Functions

Abstract: L1-type proteins are transmembrane cell adhesion molecules with an evolutionary well-conserved protein domain structure of usually six immunoglobulin and five fibronectin type III domains. By engaging in many different protein-protein interactions they are involved in a multitude of molecular functions and are important players during the formation and maintenance of metazoan nervous systems. As a result, mutations in L1-type genes cause a great variety of phenotypes, most of which are neurological in nature. In humans, mutations in the L1CAM gene are responsible for L1 syndrome and other L1-type genes have been implicated in conditions as varied as mental retardation, autism, schizophrenia, multiple sclerosis, and other disorders. Equally, the overexpression of L1-type proteins appears to have deleterious effects in various types of human tumor cells, where they generally contribute to an increase in cell mobility and metastatic potential.

Synthesis and dielectric properties of Cr-substituted CeO 2 nanoparticles

Abstract: Chromium doped ceria nanoparticles have been synthesized by using a novel solution combustion method with chromium nitrate hexahydrate as oxidizers and glycine as a fuel The main objective of the present study is to find the effect of chromium on structural, optical, dielectric properties and ac- conductivity of cerium oxide nanoparticles (CeO2 NPs) The prepared samples were characterized by various physicochemical techniques such as UV–Vis absorption spectra, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDS) analysis The powder XRD patterns confirm the cubic fluorite structure of CeO2 NPs The UV–Vis absorption spectra showed that the doping causes the red shift of absorption peaks The optical band gap of all samples has been measured by Tauc plot, which is found to be decreases with chromium concentration The uniform shaped NPs with the range of ~ 20 nm is observed by FESEM images EDS analysis confirms the expected elemental composition of Ce1−xCrxO2 NPs The dielectric constant ɛ′, dielectric loss factor (tanδ) and AC conductivity of the samples were studied as function of frequency range from 20 Hz to 3 MHz and found to be decreases with increasing the chromium content

Biological Evaluation of Silver Nanoparticles Obtained from T. arjuna Bark Extract as Both Reducing and Capping Agent

Abstract: A simple, environmentally benign and cost effective method is reported to obtain silver nanoparticles (AgNPs) using aqueous solution of AgNO3 and T. Arjuna (Terminalia Arjuna) bark extract, which act as both reducing and capping agent, under microwave irradiation. The formation of AgNPs was monitored by recording optical absorption spectra for surface plasmon resonance observed at ~425 nm. The bioactive polyphenols extracted from the plant extract are responsible for reduction of Ag+ → Ag0. During the formation of AgNPs, the reaction mixture showed gradual decrease in pH and an increase in reduction potential. The powder XRD pattern of AgNPs confirmed their fcc structure. An FTIR spectrum showed the presence of plant-residues adsorbed on the surface of AgNPs, which indicates the in situ bio-capping. The TG curve of AgNPs showed ~30 % weight loss due to thermal degradation of these plant-residues. The FE-SEM images showed spherical shape of AgNPs with an average particle size of 10–15 nm. The EDX analysis confirmed the presence of Ag as a major element. The biological evaluation of AgNPs showed higher inhibitory action for both bacteria and yeast when compared to that of fungus. A very good antioxidant property was also observed for these bio-capped AgNPs.

Nanoparticle shape effect on the thermal behaviour of moving longitudinal porous fin

Abstract: A numerical examination of nanoliquid flow over a longitudinal porous fin moving with constant speed is undertaken in the current study. Nickel alloy is used as a nanoparticle, and engineered fluid...