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Search Results: 1 - 10 of 429171 matches for " B. S. Sherigara "
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Determination of Dopamine in Presence of Uric Acid at Poly (Eriochrome Black t) Film Modified Graphite Pencil Electrode  [PDF]
Umesh Chandra, B. E. Kumara Swamy, Ongera Gilbert, Sathish Reddy, B. S. Sherigara
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22032
Abstract: A simple commercial graphite pencil electrode was used to investigate the electrochemical oxidation of dopamine. The electropolymerised film of eriochrome black t was prepared on the surface of graphite pencil electrode by using cyclic voltammetry technique. The prepared electrode exhibits an excellent electrocatalytical activity towards the determination of dopamine. The effects of concentration, pH and scan rate were investigated. Simultaneous detection of dopamine and uric acid was investigated by using both cyclic voltammetric and differential pulse voltammetry technique. The modified electrode was also used for the detection of dopamine in injection.
Cyclic Voltammetric Investigation of Dopamine at Poly-(Gabapentin) Modified Carbon Paste Electrode
M. T. Shreenivas,B. E. Kumara Swamy,Umesh Chandra,B. S. Sherigara
International Journal of Electrochemistry , 2011, DOI: 10.4061/2011/386987
Abstract: The poly (gabapentin) film was prepared on the surface of carbon paste electrode by electrochemical method using cyclic voltammetric technique. The poly (gabapentin) film-modified carbon paste electrode was calibrated with standard potassium ferrocyanide solution in 1?M KCl as a supporting electrolyte. The prepared poly (gabapentin) film-coated electrode exhibits excellent electrocatalytic activity towards the detection of dopamine at physiological pH. The scan rate effect was found to be diffusion-controlled electrode process. The concentration effect of dopamine was studied, and the redox peak potentials of dopamine were dependant on pH. 1. Introduction Dopamine (DA) is one of the most important neurotransmitters and plays a significant role in the functioning of central nervous system. A serious disease such as Schizophrenia and Parkinsonism may result from the loss of DA-containing neurons [1, 2], and patients with this disease show a low concentration of DA. Therefore, it is significant to develop sensitive and simple methods for the determination of DA. Many methods were introduced to determine DA, such as spectroscopy, chromatography, and electrochemistry [3–6]. Since DA is an oxidizable compound, it can be easily detectable by electrochemistry methods based on anodic oxidation. Carbon paste electrode was very much attracted towards the determination of biologically active molecules because of the easy preparation of modified electrode, renewability, low background current, and fast response. A number of modified carbon electrodes were developed for the determination of DA by using voltammetric techniques [7–10]. Modified carbon paste electrode can be prepared by adding different types of modifiers. Modification can be done by grinding in an agate mortar [11–13], by electropolymerisation [14–16], and also by immobilization method [17, 18]. The modified electrode has good electrocatalytic activity such as sensitivity, selectivity, and also low detection limit when compared to traditional carbon paste electrode. In the present work, the modification was carried out by preparing poly gabapentin for electrochemical investigation of DA by using cyclic voltammetry. Gabapentin, (1-(aminomethyl)cyclohexane-acetic acid; Gpn) (Scheme 1) is extensively used for the treatment of convulsive-type cerebral disorders, such as epilepsy, hypokinesia, and cranial trachoma [19]. It is sometimes prescribed for the management of neuralgia [20] and prescribed usually in combination with other medications for the prevention of seizure in people suffering from seizure
Voltammetric Detection of Dopamine in Presence of Ascorbic Acid and Uric Acid at Poly (Xylenol Orange) Film-Coated Graphite Pencil Electrode
Umesh Chandra,B. E. Kumara Swamy,Ongera Gilbert,B. S. Sherigara
International Journal of Electrochemistry , 2011, DOI: 10.4061/2011/512692
Abstract: Poly (xylenol orange) film-coated graphite pencil electrode was fabricated for the detection of dopamine in the presence of ascorbic acid and uric acid in phosphate buffer solution of pH 7. The redox peaks obtained at modified electrode shows a good enhancement. The scan rate effect was found to be a diffusion-controlled electrode process. The electrochemical oxidation of dopamine was depended on pH, and the limit of detection was found to be 9.1 10?8?M. The simultaneous study gave and excellent result with great potential difference between dopamine and other bioactive organic molecules by using both cyclic voltammetric and differential pulse voltammetric techniques. The present modified graphite electrode was applied to the detection of dopamine in the injection samples, and the recovery obtained was satisfactory. 1. Introduction The graphite pencil electrode (GPE) has been successfully acting as a biosensor in modern electroanalytical field. A porous composite is consisting of graphite particles, polymeric binder and other additives such as clay. Due to high electrochemical reactivity, high electrical conductivity, good mechanical rigidity, low cost, low technology, high electrochemical reactivity, ease of modification, renewal, low background current, and miniaturization, the GPE has good application in analysis of neurotransmitter and in the detection of traces of metal ions [1–4]. GPE has a larger active electrode surface area and is therefore able to detect low concentrations and/or volume of the analyt [5]. This type of electrode has been successfully applied to design various biosensors [6–9]. In recent days the electropolymer modified carbon paste electrode works with very much excellent effort in acting as a sensor for dopamine [10–12]. Especially, the electropolymer film-coated electrodes with dyes have good stability, reproducibility, more active sites, homogeneity in electrochemical deposition [13, 14]. The electropolymerisation generally results in polymer film which is uniform and strongly adherent to the electrode surface. In addition the polymer film can be deposited onto the small area with high degree of geometrical conformity and controllable thickness. Several redox dyes are known to artificial electron donors [15]. Such dyes are able to undergo electropolymerisation from aqueous solution producing stable redox active layer [16, 17]. Dopamine (DA) is a well-known biogenic amine acting as a neurotransmitter in the brain. It has received considerable attention because of its suspected role in a variety of neuropsychiatric disorders
Electro-oxidation of Atenolol at a Glassy Carbon Electrode
R.N.Hegde, B.E.Kumara Swamy, B.S.Sherigara and S.T.Nandibewoor
International Journal of Electrochemical Science , 2008,
Abstract: The electro-oxidation of atenolol has been studied at a glassy carbon electrode in tetramethyl ammonium chloride in methanol media by using cyclic voltammetric technique. Effects of anodic peak potential (Epa), anodic peak current (ipa) and heterogeneous rate constant (ko) have been discussed. Single irreversible voltammogram was observed. The effects of scan rate, concentration, dielectric constant and temperature were evaluated. The electro-oxidation product of atenolol has been identified as 2-[4-(3-isopropylamino-2-oxo-propoxy)-phenyl]-acetamide involving 2-electron oxidation. The electrode processes were shown to be diffusion controlled and irreversible involving adsorption effects.
Efficient Synthesis of 6-Methyl-4-phenyl-4,7-dihydrotetrazolo[5,1-c][1,2,4]triazine under Solvent-free Conditions
M. Raghavendra,Halehatty S. Bhojya Naik,Tangali R. Ravikumar Naik,Bailure S. Sherigara
Molbank , 2007, DOI: 10.3390/m541
Abstract: No abstract available
Microwave Induced Efficient Synthesis of 2-(1H-benzimidazol-2-ylthio)-4-methylquinoline
M. Raghavendra,Halehatty S. Bhojya Naik,Tangali R. Ravikumar Naik,Bailure S. Sherigara
Molbank , 2007, DOI: 10.3390/m540
Abstract: No abstract available
Introduction to the Theory of Relativity of Non-Inertial Systems and Mechanics of the Universe  [PDF]
B. S. Sadykov
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.32021
Abstract: The physical nature of inertia is explored. Authors, based on Mach’s principle, offer hypothesis of the induction nature of inertia and theory, which allows extend the principle of relativity to the non-inertial reference systems. The system of differential equations, which eliminates the shortcomings of Newtonian mechanics and Special Theory of Relativity (STR) was composed according to this theory. Row of concrete calculations and explanations are made using the theory. Reason of constancy orbital velocities of galaxies is found out and way of its calculations is shown. Existence of dark matter and the new particles (neutralinos, axons, space vacuum etc.) is prejudiced. Axial deviation of the ray of light in gravitational field is explained and calculated. An example of calculation of the Mercury’s orbital motion is made and complex planets’ trajectories are explained by the action of new field with induction nature. Flat rotation of celestial bodies and shaping of planets’ rings (like the Saturn’s rings) are explained. Indistinguishability of Doppler and Einstein’s effects for terrestrial observer is shown.
Observation of Vortex Lattice Related Anomalies in Polycrystalline YBa2Cu3O7-x Near the Superconducting Transition  [PDF]
S. B. Ota
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.310183
Abstract: The d.c. I-V characteristic of polycrystalline YBa2Cu3O7-x high temperature superconductors (HTSC) is measured near the transition temperature (Tc). The Tc was found to be 90 K with a width of 2 K. The voltage was measured at various current values and with reversing the current. A difference in voltage was found for forward and reverse current directions near Tc. The observed directionality of the I-V characteristic can be understood in terms of quantized magnetic flux by the self-field of the current and the proximity junctions in these materials. This can also be understood qualitatively as due to the d-wave superconductivity. The measured dc voltage showed increased noise near Tc which is possibly related to 1/f noise due to the motion of Abrikosov flux lines.
Mach Principle and Post-Einsteinian Relativity Theory  [PDF]
B. S. Sadykov
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.91003
Abstract: Inertia is one of the most mysterious forces of nature. Its physical nature is unknown. Accordingly, attempts are made to avoid this “dark force” in one way or another. In Newton’s mechanics and in the special relativity theory, this is done by postulating inertial reference frame, in the general relativity theory by postulating the equivalence principle. Postulates cannot change the laws of nature. One needs to know the latter. Given that the forces of inertia result in non-inertial reference frames only, a hypothesis of the induction nature of inertia has been made. According to this hypothesis, the forces of inertia result as the reaction of a body to external influence. A system of equations explaining the physical nature of inertia and its connection to gravity has been drafted. A group of coordinate conversion has been suggested, which without violating the general covariance of the laws of nature, enables to distinguish one reference frame associated with one body from another system associated with another body, to determine the privileged ones, and to take into consideration their influence on the readings of measurement instruments. A modified mechanics had been created. It takes into consideration the Mach’s principle and enables to cover all systems with the relativity principle. All of the relativistic effects arise from it. The reasons for emergence of new particles, dark matter, dark energy etc. are explained. New effects are predicted.
Weibull-Bayesian Estimation Based on Maximum Ranked Set Sampling with Unequal Samples  [PDF]
B. S. Biradar, B. K. Shivanna
Open Journal of Statistics (OJS) , 2016, DOI: 10.4236/ojs.2016.66083
Abstract: A modification of ranked set sampling (RSS) called maximum ranked set sampling with unequal sample (MRSSU) is considered for the Bayesian estimation of scale parameter α of the Weibull distribution. Under this method, we use Linex loss function, conjugate and Jeffreys prior distributions to derive the Bayesian estimate of α. In order to measure the efficiency of the obtained Bayesian estimates with respect to the Bayesian estimates of simple random sampling (SRS), we compute the bias, mean squared error (MSE) and asymptotic relative efficiency of the obtained Bayesian estimates using simulation. It is shown that the proposed estimates are found to be more efficient than the corresponding one based on SRS.
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