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.

Preparation and Kinetic Considerations for the Dissolution of Cr‐substituted Iron Oxides in Reductive‐complexing Formulations

Abstract: The dissolution rate coefficients of Cr-substituted (0-20 at.% Cr) iron oxides viz. hematite and magnetite were determined by using an inverse cubic rate (ICR) law applicable for spherical particles as well as by a general kinetic equation (GKE) applicable for polydispersed particles. An attempt is made to compare both the treatments for different kinds of dissolution profiles obtained by employing oxides with narrow particle size distribution in V(II)-EDTA and citric acid-EDTA-ascorbic acid formulations at 353±5K. The dissolution profiles could be classified into three types based on the nature of oxide and formulations. It is observed that both ICR and GKE treat the dissolution course as a function of decrease in fraction of undissolved mass, m/m0. The dissolution rate coefficients determined by ICR and GKE have shown the similar trend of decrease with increasing Cr content of the oxides and was ascribed to lattice stabilization. Les coefficients de vitesse de dissolution des oxydes de fer substitues par du Cr (0-20 % de Cr), a savoir l'hematite et la magnetite, ont ete determines a l'aide de la loi de « vitesse cubique inverse » (ICR) applicable aux particules spheriques ainsi que d'une « equation cinetique generale » (GKE) applicable aux particules polydispersees. On tente de comparer ces deux approches pour differentes sortes de profils de dissolution obtenus avec des oxydes a distribution de tailles de particules etroite dans les formulations de V(II)-EDTA et d'acide citrique-EDTA-acide ascorbique a 353±5K. Les profils de dissolution pourraient se classer en trois categories selon la nature de l'oxyde et les formulations. On observe que les methodes ICR et GKE traitent le processus de dissolution comme une fonction de la diminution de la fraction de matiere non dissoute, m/m0. Les coefficients de vitesse de dissolution determines par l'ICR et la GKE montrent la meme tendance a la diminution avec l'augmentation de la teneur en Cr des oxydes, ce qui est impute a une stabilisation du reseau.

Spectrophotometric investigations of the assay of physiologically active catecholamines in pharmaceutical formulations.

Abstract: Two simple, sensitive, and accurate spectrophotometric methods are proposed for the determination of levodopa (LD), methyldopa (MD), dopamine hydrochloride (DP), and pyrocatechol (PC) in pure and pharmaceutical preparations. The methods are based on measurement of the absorbances of tris(o-phenanthroline)iron(II) (method A) and tris(bipyridyl)iron(II) (method B) obtained by the oxidation of the catecholamines by iron(III) in the presence of 1,10-phenanthroline and 2,2'-bipyridyl at 510 and 522 nm, respectively. The absorbances were found to increase linearly with increases in the concentrations of the catecholamines, results which were corroborated by the calculated correlation coefficients (0.9990-0.9996). Beer's law was valid over the concentration ranges of 0.04-0.6, 0.06-0.75, 0.06-0.65, and 0.05-0.70 microg/mL in method A and 0.02-1.0, 0.04-1.3, 0.05-1.0, and 0.06-1.1 microg/mL in method B for PC, MD, LD, and DP, respectively. The common excipients and additives did not interfere in their determinations. The proposed methods were successfully applied to the assay of LD, MD, and DP in various dosage forms. The results were validated by statistical analysis.

Spin squeezing in symmetric multiqubit states with two non-orthogonal Majorana spinors

Abstract: Enhanced precision measurements using entangled many particle states are crucial for their technological applications in quantum information science and metrology. Squeezed spin states are a class of permutation symmetric N particle entangled states, which exhibit reduced quantum fluctuation in their collective spin angular momentum in a certain direction, and they are useful for quantum enhanced metrology. Permutation symmetric states attract attention as they offer significant test grounds for the description of entanglement in multipartite quantum systems, which is crucial for processing complex quantum information tasks. Spin squeezing serves as an experimentally amenable collective criterion of entanglement in symmetric multiqubit systems. In this paper, we explore spin-squeezing behavior in different classes of N-qubit symmetric states consisting of all permutations of two distinct spinors. We employ Majorana geometric representation of multiqubit states obeying exchange symmetry for this purpose. We prove that N qubit symmetric states consisting of two distinct non-orthogonal spinors do exhibit spin squeezing, thus expanding the avenues of their applicability in quantum enhanced sensing tasks.

Almost $$*$$∗ -Ricci soliton on paraKenmotsu manifolds

Abstract: We consider almost $$*$$ -Ricci solitons in the context of paracontact geometry, precisely, on a paraKenmotsu manifold. First, we prove that if the metric g of $$\eta $$ -Einstein paraKenmotsu manifold is $$*$$ Ricci soliton, then M is Einstein. Next, we show that if $$\eta $$ -Einstein paraKenmotsu manifold admits a gradient almost $$*$$ -Ricci soliton, then either M is Einstein or the potential vector field collinear with Reeb vector field $$\xi $$ . Finally, for three-dimensional case we show that paraKenmotsu manifold is of constant curvature $$-1$$ . An illustrative example is given to support the obtained results.

Inhibition of ATPase activity in the freshwater fish Labeo rohita (Hamilton) exposed to sodium cyanide.

Abstract: Present study concerns the effect of sodium cyanide on the Indian major carp, Labeo rohita. Fishes were exposed to lethal (0.32 mg/L) and sublethal (0.064 mg/L) concentrations of sodium cyanide. The effect of intoxication was studied on Na+K+ATPase, Mg+2ATPase and Ca2+ATPase in various physiological tissues (gill, liver, and muscle) at the end of 1, 2, 3 and 4 days of lethal and 5, 10 and 15 days of sublethal exposure periods. Sodium cyanide induced significant inhibitory effects on the ATPase activity of the fish. Inhibition of the ATPase blocked the active transport system of the gill epithelial as well as chloride cells, and thus altered the osmo-regulatory mechanism of the fish. The value of the measured responses as an indicator of stress caused by water contamination discussed. The results confirm that ATPase levels significantly decreased in treated fish, indicating that ATPases could be used as sensitive and useful biomarkers for cyanide pollution.