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Nagaraja P.,University of Mysore | Honnur Krishna,University of Mysore | Shivakumar A.,Regional Institute of Education | Shrestha A.K.,University of Mysore
Clinical Biochemistry | Year: 2012

Objective: To develop a simple, rapid, sensitive and affordable assay method for the determination of glucose in blood samples using a novel approach. Design and methods: A spectrophotometric method for glucose quantification in human serum samples based on self-coupling of activated 2,5-dimethoxyaniline (DMA) in the presence of peroxidase (POD)/glucose oxidase (GOD) and H 2O 2 is described. H 2O 2 generated in situ by catalytic reaction between GOD and glucose, activates DMA in the presence of POD to form a green-colored product, which has a strong absorption at λ max=740nm at room temperature (30°C) in a 100mmol/L acetate/acetic acid buffer of pH 4.2. Results: The linearity ranges for the quantification of glucose by rate and one-time detection method are 0.017-0.740 and 0.017-0.478. mmol/L, respectively. Within-day and day-to-day precision were 0.98-1.4% (n = 10) and 1.33-2.89% (n = 15), respectively. Glucose recoveries ranged from 96.6 to 102%, indicating minimal interference by commonly present interferants in serum samples. Accuracy results were between 90 and 102%. The detection and quantification limits of glucose were 2.376 and 7.923 μmol/L, respectively. The proposed method has good correlation coefficient of 0.999 with the enzymatic kit method. Conclusions: This is a rapid and convenient method to determine serum glucose using simple spectrophotometer with excellent recovery and minimal interference by interferants in serum samples with low detection limit. Therefore, this method can be considered for adoption by the clinical diagnostic laboratories. © 2011 Elsevier B.V.. Source


Tanwar P.,Regional Institute of Education
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2015

The photogalvanic cell containing sodium Lauryl sulphate as micellar species, mannitol as an electron donor, and methylene blue as photo sensitizer has been used for solar energy conversion and storage. The electrical output of the cell was 999.0 mV, 85.0 A, and 849.15 W, respectively, as photopotential, photocurrent, and power at power point of the cell. The current voltage characteristics of the cell have been studied; observed conversion efficiency was 0.2664% and determine fill factor was 0.32. The performance of the cell in the dark was 45.0 min. © Taylor and Francis Group, LLC. Source


Kaur N.,Regional Institute of Education | Mohan R.,Jeju National University | Gaur N.K.,Barkatullah University | Singh R.K.,ITM University
Journal of Alloys and Compounds | Year: 2011

The elastic and thermodynamic properties for Sr1-xLa xMoO3 (x = 0.0, 0.05, 0.1, 0.15, and 0.2) with temperature have been investigated, probably for the first time, by using modified rigid ion model (MRIM). The computed results on the elastic constants (C11, C12, and C44) are the first report on them. Using these elastic constants we have computed other elastic properties such as B, β, G′, G, E, σ, B/G ratio, Cauchy pressure (C12 - C 44) and Lame's parameters (μ, λ). We have also reported the thermodynamic properties such as φ, f, θD, θD1, υ0, υ1, γ, and α. The values of Young's modulus, shear modulus and compressibility for SrMoO3 are in good agreement with the available experimental data. The concentration (x) dependence of θD in Sr 1-xLaxMoO3 suggests that increased La doping drives the system effectively away from the strong electron-phonon coupling regime. Specific heat is reported in the wide temperature range and compared with the respective experimental data available in the literature. The thermal expansion coefficient of SrMoO3 is in good agreement with the other theoretical data. © 2011 Elsevier B.V. All rights reserved. Source


Chand N.,Advanced Materials and Processes | Fahim M.,University of Delhi | Sharma P.,Advanced Materials and Processes | Bapat M.N.,Regional Institute of Education
Wear | Year: 2012

The ever increasing demand for high strength lightweight material is driving the current research efforts to develop advanced materials for a variety of structural applications. Polymer matrix composites form that group of advanced materials which are preferred in structural applications owing to their high specific strength. The concern for a safe environment further demands the optimum utilization of reinforcing agents and fillers that are derived from natural sources. In such a scenario rice husk seems promising as filler for polymer matrix composites. It is an agricultural waste produced in bulk quantity during rice milling. It has proved to be efficient agro filler for developing light weight polymer based composites. The weight of rice husk filled polymer composites can be further reduced if foaming agents are introduced. In the present study the influence of a foaming agent on the mechanical and wear behavior of surface modified rice husk filled polyvinylchloride has been studied. Six composites having 10, 20 and 30 weight percent of unmodified and surface modified rice husk having a small percent of a foaming agent have been studied and compared with foamed PVC. It was observed that with an increase in rice husk content wear resistance as well as compressive strength of composites increased. Surface treatment of rice husk by maleic anhydride improved the wear resistance due to improvement in compatibility between rice husk and PVC compound. © 2012 Elsevier B.V. Source


Sharma J.,CSIR - Central Electrochemical Research Institute | Chand N.,CSIR - Central Electrochemical Research Institute | Bapat M.N.,Regional Institute of Education
Results in Physics | Year: 2012

Dielectric characterization of cenosphere filled low density polyethylene composites is reported in this paper. Cenosphere filled low density polyethylene (LDPE) composites with inhomogeneous dispersions of cenosphere were prepared and dielectric measurements have been performed on these composites in the temperature range 34-110°C in the frequency range 1-10kHz. The dielectric constants of the composites with filler concentrations 0%, 10%, 15% and 20vol.% were measured. Effect of temperature and frequency variations on dielectric constant (ε'), dissipation factor (tanδ) and a.c. conductivity (σ a.c.) was also determined. The frequency dependent dielectric and conductivity behaviour of flyash cenosphere filled low density polyethylene (LDPE) polymer composites have been studied. Appearance of peak in the dielectric loss curves for all the concentrations confirms the presence of relaxing dipoles in the cenosphere/LDPE composites. The effect of filler distribution on the dielectric constant is examined and the observed differences are attributed to the differences in two kinds of interfaces present: one formed between the touching cenosphere particles and the other formed between LDPE and cenosphere. With the increase of cenosphere content dielectric constant decreased gradually. Maxwell-Garnett approximation fairly fits for the dielectric data obtained experimentally for these composites. © 2012 Elsevier B.V. Source

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