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Search Results: 1 - 10 of 638 matches for " Gowri Sankar Singaraju "
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Tongue Thrust Habit - A Review
Gowri sankar singaraju,Chetan kumar
Annals and Essences of Dentistry , 2009,
Abstract: There is interrelation ship between the form and function. The different abnormal habits may effect the form of orofacial structures. The presence of one oral habit may induce the other. In this review article a new induction chart is prepared to show the interrelation between different abnormal habits and their effect on form. The chart also in turn explains how form can lead to development of different habits. Thus there is interrelation ship between form and function
Temporary Anchorage Devices in Orthodontics
Gowri Sankar Singaraju,Vasu Murthy
Annals and Essences of Dentistry , 2009,
Abstract: Anchorage control is one of the main aspects of orthodontic treatment plan. A good appliance system should put minimum taxation of anchorage on the anchor units. The structures present with in the confinement of oral cavity are very less in number. In such cases the anchor unit gets its reinforcement from extraoral structures or intraoral appliances. Extraoral anchorages have their inherent drawbacks and most of them rely on patient cooperation. The use of implants in orthodontics to reinforce the anchorage is a recent concept. The purpose of this article is to review the implants in the context of orthodontics which are called as TAD- temporary anchorage devices.
Methods of Identification in Forensic Dentistry
Ratnakar.P,Gowri Sankar Singaraju
Annals and Essences of Dentistry , 2010,
Abstract: The subject of Forensic Odontology has been generating as an area of emphasis for all interested and properly trained dentists in all hazards response. Many States have recognized the role of forensic dentist in the areas of emergency/hazard readiness. Forensic Odontology or Forensic Dentistry has been a discipline within the oral medicine fold and has been a well-accepted role for dentists. When the Tsunami in the Tamilnadu in 2001 and Bomb blasts in Mumbai in 2008 struck the people , another facet in the role of dentists and dentistry in emergency response as a forensic expert came to the collective consciousness of oral health professionals. The dentists participating in such events should be properly trained to have a meaning full role in disaster response. The dental evidence in forensic investigation is legally accepted. However there are certain pitfalls associated with the various methods in forensic dentistry. In this review various methods employed in the forenic odontology for personal identification such as Bite marks, Cheiloscopy , Rugoscopy , photographs and radiographs are discussed.
Development and Validation of a Rapid RP-HPLC Method for the Estimation of Esmolol Hydrochloride in Bulk and Pharmaceutical Dosage Forms
Vanita Somasekhar,D. Gowri Sankar
Journal of Chemistry , 2010, DOI: 10.1155/2010/470785
New Diazo Coupling Reactions for Visible Spectrophotometric Determination of Alfuzosin in Pharmaceutical Preparations
M. Vamsi Krishna,D. Gowri Sankar
Journal of Chemistry , 2007, DOI: 10.1155/2007/289426
Extractive Spectrophotometric Methods for the Determination of Rosuvastatin Calcium in Pure Form and in Pharmaceutical Formulations by Using Safranin O and Methylene blue
Marothu Vamsi Krishna,Dannana Gowri Sankar
Journal of Chemistry , 2007, DOI: 10.1155/2007/454853
Adaptation of Color Reactions for Spectrophotometric Determination of Pitavastatin Calcium in Bulk Drugs and in Pharmaceutical Formulations
Marothu Vamsi Krishna,Dannana Gowri Sankar
Journal of Chemistry , 2007, DOI: 10.1155/2007/628987
Optimization and Validation of Quantitative Spectrophotometric Methods for the Determination of Alfuzosin in Pharmaceutical Formulations
M. Vamsi Krishna,D. Gowri Sankar
Journal of Chemistry , 2007, DOI: 10.1155/2007/912762
Electronic Properties of Boron and Silicon Doped (10, 0) Zigzag Single-Walled Carbon Nanotube upon Gas Molecular Adsorption: A DFT Comparative Study
P. A. Gowri sankar,K. Udhayakumar
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/293936
Abstract: We have performed a comparative study of nine predominant gas molecules (H2, H2O, O2, CO, CO2, NO, NO2, NH3, and CH3OH) adsorption property on the top surface of the (10, 0) zigzag single-walled pristine Carbon nanotube (C-CNT), Boron doped carbon nanotube (B-CNT), and Silicon doped carbon nanotube (Si-CNT) are investigated by using density functional theory (DFT) computations to exploit their potential applications as gas sensors. For the first time, we calculated the optimal equilibrium position, absorption energy ( ), and density of states (DOS) of the considered gas molecules adsorbed on the open end of zigzag single-walled (10, 0) B-CNT and Si-CNT. Our first principle calculations demonstrate that the B-CNT and Si-CNT adsorbent materials are able to adsorb the considered gas molecules with variety of adsorption energy and their electronic structure dramatic changes in the density of states near the Fermi level. The obtained comparative DFT studies results are useful for designing a high-fidelity gas sensor materials and selective adsorbents for a selective gas sensor. 1. Introduction Gas molecular adsorption in nanostructures is an important issue for both fundamental research and technical application. In recent years, carbon nanotubes have been intensively studied due to their importance as building blocks in nanotechnology. The special geometry and unique properties of carbon nanotubes offer great potential applications, such as nanoelectronic devices, fuel cell, energy storage, chemical probes and biosensors, field emission display, and gas sensor [1–4]. Carbon nanotubes (CNTs) have the potential to be developed as a new gas sensing material due to their inherent properties such as their small size, great strength, high electrical and thermal conductivity, high surface-to-volume ratio, and hollow structure of nanomaterials. As a result, it is possible to create a miniaturized sensor, which can lead to low power consumption, lighter, and low cost. Therefore, CNTs-based gas sensors and their mechanisms have been widely studied recently. Different kinds of nanotubes have been investigated for gas molecules adsorption, such as carbon nanotubes (CNTs) [5–15], boron nitride nanotubes (BNNTs) [16–22], boron doped nanotubes [23–27], silicon carbide nanotubes [28–46], zinc oxide nanotube, TiO2 nanotube, tungsten carbide nanotube, and MgO nanotube [47]. Meanwhile, the efficiency of gas adsorption on pristine carbon nanotubes can be enhanced by doping process [16–46]. Doping (heteroatom substitution) is also a promising approach to enable single-walled
Curious Case of Bactericidal Action of ZnO
Somnath Ghosh,R. Gowri Sankar,V. Vandana
Journal of Nanoscience , 2014, DOI: 10.1155/2014/343467
Abstract: ZnO nanoparticles (NPs) are well known for their bactericidal properties. Various mechanisms are proposed for their bactericidal activity. An ambiguity still prevails to know which mechanism or property is mainly influencing the bactericidal activity of ZnO NPs. The antibacterial properties of ZnO NPs were investigated against both Gram-positive and Gram-negative bacteria. Different ZnO samples with different degrees of surface oxygen vacancies were prepared from ZnO2. The surface oxygen vacancy and thereby reactive oxygen species (ROS) production in aqueous ZnO solution are quantified by photoluminescence (PL) and electron paramagnetic resonance (EPR) spin trapping experiments, respectively. Systematic experiments have been performed to validate a precise antibacterial mechanism of ZnO particle. 1. Introduction The rapid development of nanotechnology emerges in a diverse range of nanomaterials and nanoproducts [1]. Various desired targets have been accomplished in order to employ materials in medicinal fields by maneuvering them at their atomic size scale [2, 3] through nanotechnology. Unfortunately, many such benevolent materials develop toxicity. As toxicities are selective to biological systems, nanomaterials are well exploited for antibacterial applications. To combat bacterial infections metal and metal oxide NPs in various forms are well studied [4–15]. The exposure of such NPs in the environment demands a fundamental understanding about their mode and range of toxicity. Their mode or modes of action towards bacteria remained ambiguous. ZnO NPs have been extensively used as antibacterial agents for water purification [16–19], biofilm prevention [20–22], sunscreen lotion [23, 24], wound dressing [25], and so forth. Protection against intestinal bacterial infections by bulk ZnO was reported in late 1990s [26, 27] though its bactericidal activity against a broad spectrum of bacteria (e.g., Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Streptococcus agalactiae, etc.) was revealed little late when ZnO NPs were exposed to bacterial solution [28–32]. Although the antimicrobial properties of ZnO NPs have been utilized to kill bacteria in different issues, their mechanistic pathways are still imprecise. The mechanisms of antibacterial property of ZnO NPs so far proposed are as follows: (i) physical attack of ZnO NPs on the bacteria [18, 33, 34] (ZnO NPs can adhere to the bacterial cell wall surface and eventually pierce into cell leading to bacterial death by membrane disruption), (ii) oxidative stress generated by particles in solutions
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