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.

Enhanced electrochemical performance of LiVPO 4 F/f-graphene composite electrode prepared via ionothermal process

Abstract: In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO4F electrode material. Structural and morphological features of LiVPO4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO4F is modified to LiVPO4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-ions. This article also provides the comparative electrochemical performances of LiVPO4F/f-graphene composite, LiVPO4F/carbon, and LiVPO4F/graphene composite electrodes in a nonaqueous rechargeable Li-ion battery system.

Benzo[h]quinoline based Macrocyclic Copper(II), Cobalt(II) Complexes: Synthesis, Characterization and Light induced DNA Cleavage Studies

Abstract: A new ligand dibenzo[h]quinolineno[1,3,7,9] tetraazacyclododecine-7,15 (14H, 16H)-dibenzene (L) and its Co(II)/Cu(II) metal complexes of type [MLX2] (Where (M = Co(II) (5), Cu(II) (6) and X = Cl) were synthesized and are well characterized by FT-IR, 1H-NMR, FAB mass elemental analysis, and electronic spectral data. The role of the cobalt/copper metals in photo-induced DNA cleavage reactions was explored by designing complex molecules having macrocyclic structure. Finally, we have shown that photocleavage of plasmid DNA is more efficiently enhanced when this macrocyclic ligand is irradiated in the presence of copper(II) than that of cobalt metal.

Frequency dependence studies on the interface trap density and series resistance of HfO2 gate dielectric deposited on Si substrate: Before and after 50 MeV Li3+ ions irradiation

Abstract: We report the first investigation of the frequency dependent effect of 50 MeV Li3+ ion irradiation on the series resistance and interface state density determined from capacitance–voltage (C–V) and conductance–voltage (G–V) characteristics in HfO2 based MOS capacitors prepared by rf-sputtering. The samples were irradiated by 50 MeV Li3+ ions at room temperature. The measured capacitance and conductance were corrected for series resistance. The series resistance was estimated at various frequencies from 1 KHz to 1 MHz before and after irradiation. It was observed that the series resistance decreases from 6344.5 to 322 Ω as a function of frequency before irradiation and 8954–134 Ω after irradiation. The interface state density Dit decreases from 1.12 × 1012 eV−1 cm−2 before irradiation to 3.67 × 1011 eV−1 cm−2 after ion irradiation and further decreases with increasing frequency.

Anthelmintic activity of pyrostegia venusta using pheretima posthuma

Abstract: Approximately 3 million people are infected with helminthes worldwide. Helminthes infections are commonly found in villages of developing countries and are being recognized as cause of much acute as well as chronic illness among the human beings as well as cattle’s. Hence, the treatment for helmintic infection is of utmost need. The high cost of modern anthelmintics has limited the effective control of these parasites. However, increasing problems of development of resistance in helminthes against anthelmintics have led to the proposal of screening medicinal plants for their anthelmintic activity. Literature survey revealed that there are only few reports available on phytochemical and pharmacological studies of this plant. In the present investigation we have made a sincere attempt to evaluate the anthelmintic property of chloroform and methanol extracts of Pyrostegia venusta using Pheretima posthuma as an experimental helminthes model. Piperazine citrate was used as the standard reference. Five different concentrations (2.5, 5.0, 7.5, 10.0 and 12.5 mg/ml) of chloroform and methanol extracts were used to determine their effect as time taken to paralysis and time to induce death in the worms. Among the various concentrations of chloroform extract tested, 12.5 mg/ml showed efficient anthelmintic activity with paralysis time (23 min) and death time (44 min). Among all the concentrations of methanolic extract tested, 12.5 mg/ml showed significant results with paralysis time (34 min) and death time (78 min) respectively. This investigation revealed that chloroform extract was more effective in its anthelmintic action against Pheretima posthuma when compared to methanolic extract. But both the extracts were less potent when compared with standard drug piperazine citrate.