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Search Results: 1 - 10 of 15 matches for " Chandrabhan Dohare "
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Investigation of Crystallization Kinetics in Glassy Se and Binary Se98M2 (M=Ag, Cd, Zn) Alloys Using DSC Technique in Non-Isothermal Mode  [PDF]
Chandrabhan Dohare, Neeraj Mehta
Journal of Crystallization Process and Technology (JCPT) , 2012, DOI: 10.4236/jcpt.2012.24025
Abstract: The crystallization kinetics of glassy Se and binary Se98M2 (M=Ag, Cd, Zn) alloys have been studied at different heating rates (5, 10, 15, 20 Kmin-1) using Differential Scanning Calorimetric (DSC) technique. The crystallization temperature (Tc) is determined from exothermic peak obtained in DSC scans of present samples. The variation in peak crystallization temperature (Tc) with the heating rate (β) has been used to investigate the growth kinetics using Kissinger, Augis-Bennet and Matusita-Sakka models. The activation energy of crystallization (Ec) has been found to increase with Ag additive and to decrease with Zn and Cd additive. The value of various kinetic parameters such as rate constant (Kp), Avrami index (n), thermal stability (S) and Hruby number (Hr) have been calculated under non-isothermal mode. The maximum change in different kinetic parameters has been found after the incorporation of Ag additive.
Sources of exposure to and public health implications of organophosphate pesticides
Jaga,Kushik; Dharmani,Chandrabhan;
Revista Panamericana de Salud Pública , 2003, DOI: 10.1590/S1020-49892003000800004
Abstract: objective: to review the public health significance of organophosphate pesticide exposure in the united states of america. since the situation of high organophosphate pesticide exposure and the concomitant health risks in the developing countries of the world is well known, this article seeks to highlight the public health significance of organophosphate exposure in the united states, where it is less common than in many other nations. looking at the situation in the united states would serve to further emphasize the seriousness of organophosphate pesticide-related health issues in developing countries. methods: a search for journal articles on organophosphate pesticides and organophosphate exposure was done on the pubmed electronic bibliographic database system of the national library of medicine of the united states. to supplement that search, information on organophosphate toxicity, biological monitoring, and regulation of pesticides was obtained from other published articles, textbooks, and relevant internet sites. results: organophosphate pesticides are a group of chemicals that are mainly used in agriculture. organophosphates inhibit the activity of both the cholinesterase (che) enzymes-red blood cell (rbc) che and serum che-resulting in the cholinergic features of organophosphate toxicity. a 50% reduction in serum che activity from the baseline is an indication of acute organophosphate toxicity. the rbc che activity, which is less rapidly depressed than the serum che activity, is a measure of chronic exposure to organophosphates. exposures to organophosphates are broadly classified into two categories: occupational and environmental. occupational exposures occur among agricultural workers (including migrant farmworkers), industrial workers, pest control exterminators, and other workers. nonoccupational exposure affects a large segment of the general population in the united states. residential exposures come from organophosphate pesticide use by exterminators
Sources of exposure to and public health implications of organophosphate pesticides
Jaga Kushik,Dharmani Chandrabhan
Revista Panamericana de Salud Pública , 2003,
Abstract: OBJECTIVE: To review the public health significance of organophosphate pesticide exposure in the United States of America. Since the situation of high organophosphate pesticide exposure and the concomitant health risks in the developing countries of the world is well known, this article seeks to highlight the public health significance of organophosphate exposure in the United States, where it is less common than in many other nations. Looking at the situation in the United States would serve to further emphasize the seriousness of organophosphate pesticide-related health issues in developing countries. METHODS: A search for journal articles on organophosphate pesticides and organophosphate exposure was done on the PubMed electronic bibliographic database system of the National Library of Medicine of the United States. To supplement that search, information on organophosphate toxicity, biological monitoring, and regulation of pesticides was obtained from other published articles, textbooks, and relevant Internet sites. RESULTS: Organophosphate pesticides are a group of chemicals that are mainly used in agriculture. Organophosphates inhibit the activity of both the cholinesterase (ChE) enzymes-red blood cell (RBC) ChE and serum ChE-resulting in the cholinergic features of organophosphate toxicity. A 50% reduction in serum ChE activity from the baseline is an indication of acute organophosphate toxicity. The RBC ChE activity, which is less rapidly depressed than the serum ChE activity, is a measure of chronic exposure to organophosphates. Exposures to organophosphates are broadly classified into two categories: occupational and environmental. Occupational exposures occur among agricultural workers (including migrant farmworkers), industrial workers, pest control exterminators, and other workers. Nonoccupational exposure affects a large segment of the general population in the United States. Residential exposures come from organophosphate pesticide use by exterminators and by household residents as well as from dietary and accidental exposures. Other environmental exposures occur in public places and areas close to farms, and exposures could also happen from organophosphate use in chemical warfare or terrorism. In the United States some organophosphate pesticides are restricted by the Environmental Protection Agency in order to protect humans, animals, and the environment. In addition, the Food Quality Protection Act regulates dietary exposure to pesticides, particularly for infants and children. CONCLUSIONS: Organophosphate pesticides continue to pose a r
Isolation of Dental Caries Bacteria from Dental Plaque and Effect of Tooth Pastes on Acidogenic Bacteria  [PDF]
Dhruw Chandrabhan, Rajmani Hemlata, Bhatt Renu, Verma Pradeep
Open Journal of Medical Microbiology (OJMM) , 2012, DOI: 10.4236/ojmm.2012.23009
Abstract: Destruction of calcified tissue was caused by acids which are by product of carbohydrate metabolism of acidogenic bacteria consequent to dental caries. The purpose of this study was to assess the existence of acidogens potentially causing the dental caries and comparatively evaluation of efficacy of different toothpastes. The dental plaques of fifty persons belong to three age groups (1 - 20, 21 - 40, 41 - 60 year and above) were examined to identify microorganisms by the culture method. Thirty nine bacteria were isolated by spread plate method on BSMY I minimal media. Thirteen out of thirty nine, acidogens colonized in the dental plaques. Seven potentially acidogens CD17, CD26, CD27, CD28, CD29, CD34 and CD35 were treated with five different toothpastes. Inhibition effect of Triclosan and Fluoride containing tooth pastes were found more efficient. The results of the present study revealed that bacteria that commonly cause dental caries colonized in dental plaques of children and alcoholic person. Therefore, dental plaques must be considered a specific reservoir of colonization and subsequent dental caries. To reduce the dental problem triclosan and fluoride containing product should be recommended.
Iso-conversional analysis of glass transition and crystallization in as-synthesis high yield of glassy Se98Cd2 nanorods
C. Dohare,N. Mehta
Applied Nanoscience , 2013, DOI: 10.1007/s13204-012-0143-3
Abstract: In the present work, we have prepared high yield of glassy Se98Cd2 nanorods using melt–quench technique. The morphology and micro-structural analysis of as-prepared nanorods are characterized by SEM, XRD and EDX techniques. The glass transition and crystallization kinetics of glassy Se98Cd2 nanorods are studied at different heating rates (5, 10, 15, 20 K/min) using differential scanning calorimetric (DSC) technique. Four iso-conversional methods [Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), Tang and Straink] were used to determine the various kinetic parameters (crystallization temperature T αc, transition temperature T αg, activation energy of crystallization E αc, activation energy of glass transition E αg, order parameter n) of glass transition and crystallization process in non-isothermal mode. The monotonous decrease in activation energy E α with the crystallization fraction α confirm the complex kinetic mechanism of the glassy Se98Cd2 nanorods.
APPLICATION BASED SEMANTIC WEB MINING TECHNIQUE
Mahindra Pratap Singh Dohare
Journal of Global Research in Computer Science , 2011,
Abstract: The Web is a huge read-write information space where many items such as documents, images or other multimedia can be accessed. In this context, several information technologies have been developed to help users to satisfy their searching needs on the Web, and the most used are search engines. Search engines allow users to find Web resources formulating queries (a set of terms) and reviewing a list of answers. The Semantic Web improves the Web infrastructure with formal semantics and interlinked data, enabling flexible, reusable, and open knowledge management systems. The move towards open and interlinked data on the Web and the Semantic Web results in more open systems. In contrast to traditional database-driven applications, open systems liberate the data that they operate on: sources are decentralized, data can be semi-structured with arbitrary vocabulary and contributions can be published anywhere. This thesis offers algorithms and components that simplify and support knowledge management based on Semantic Web technology. We address four areas of Semantic Web application development: programmatic access: how to program against the flexible graph-based model; data navigation: how to navigate arbitrary information spaces; data entry: how to guide users through collaborative recommendation; and data discovery: how to locate relevant data sources. Our hypothesis is that the issues of programmatic access, data navigation, data entry, and data discovery can be addressed, with acceptable results, through the sole introspection of instance data at runtime, without relying on fixed schema structures at design time. In all four areas we devise solutions that are domain independent, rely only on instance data and dynamically adjust to the available data.
IN-VITRO ANTIOXIDANT ACTIVITY OF ASPARAGUS RACEMOSUS ROOTS
Kamran J. Naquvi,Senahlata Dohare,Mohd. Shuaib
International Journal of Biomedical Research , 2013, DOI: 10.7439/ijbr.v2i4.99
Abstract: Objective: The objective of present study is to evaluate the antioxidant activity of methanolic extract of Asparagus racemosus roots (liliaceae). Material and methods: The antioxidant activity of the methanolic extract of A. racemosus was determined by using a method based on the reduction of methanolic solution of coloured-free radical 1, 1 diphenyl-1-2 picrylhydrazyl (DPPH). The radical scavenging activity of tested sample was expressed as an inhibition percentage. Butylated hydroxyl toluene was used as reference standard. The absorbances of all the dilutions were taken after 30 minutes at max 517 nm using methanol as blank. Results and Discussion: The IC50 value of A. racemosus was 4158.8 whereas butylated hydroxyl toluene used as a standard showed an IC50 of 46.25 μg. The absorbance of samples (Methanolic extract of A. racemosus and standard Butylated hydroxytoluene) were taken in triplicate. Conclusion: The present study showed that the methnolic extract of roots of A. racemosus have moderate free radical scavenging activity.
IN-VITRO ANTIOXIDANT ACTIVITY OF ASPARAGUS RACEMOSUS ROOTS
Kamran J. Naquvi,Senahlata Dohare,Mohd. Shuaib
International Journal of Biomedical Research , 2011, DOI: 10.7439/ijbr.v2i4.99
Abstract: Objective: The objective of present study is to evaluate the antioxidant activity of methanolic extract of Asparagus racemosus roots (liliaceae). Material and methods: The antioxidant activity of the methanolic extract of A. racemosus was determined by using a method based on the reduction of methanolic solution of coloured-free radical 1, 1 diphenyl-1-2 picrylhydrazyl (DPPH). The radical scavenging activity of tested sample was expressed as an inhibition percentage. Butylated hydroxyl toluene was used as reference standard. The absorbances of all the dilutions were taken after 30 minutes at λmax 517 nm using methanol as blank. Results and Discussion: The IC50 value of A. racemosus was 4158.8 whereas butylated hydroxyl toluene used as a standard showed an IC50 of 46.25μg. The absorbance of samples (Methanolic extract of A. racemosus and standard Butylated hydroxytoluene) were taken in triplicate. Conclusion: The present study showed that the methnolic extract of roots of A. racemosus have moderate free radical scavenging activity.
DESIGN AND NOISE ANALYSIS OF BIQUAD GIC NOTCH FILTER IN 0.18 μM CMOS TECHNOLOGY
Akhilesh Kumar,Bhanu Pratap Singh Dohare
International Journal of Advances in Engineering and Technology , 2011,
Abstract: In design of analog circuits not only the gain and speed are important but power dissipation, supply voltage, linearity, noise and maximum voltage swing are also important. Noise limits the minimum signal level that a circuit can process with acceptable quality. Today analog designers constantly deal with the problem of noise because it trades with power dissipation, speed, and linearity. So in this paper a biquad GIC notch filter is design which provides low noise linearity. In this research, the design and VLSI implementation of active analog filter, based on the Generalized Impedance Converter (GIC) circuit, are presented. The analog features include the filter type (band pass, high pass, low pass or notch), the centre or cut off frequency, and the quality factor. The circuit is then modeled and simulated using the Cadence Design Tools software package. Active filters are implemented using a combination of passive and active (amplifying) components, and require an outside power source. Operational amplifiers are frequently used in active filter designs. These can have high Q factor, and can achieve resonance without the use of inductors. This paper presents a new biquad GIC notch filter topology for image rejection in heterodyne receivers and Front End receiver applications. The circuit contains two op-amp, resistors, and capacitor topology for testing purposes. It is implemented with standard CMOS 0.18μm technology. The circuit consumes 0.54 mW of power with a open loop gain 0dB, 1 dB compression point the linear gain obtained +7.5dBm at 1.1 kHz and 105 degree phase response , from a 1.8V power supply optimum.
PHARMACOGNOSTICAL AND PHYTOCHEMICAL INVESTIGATION OF AERIAL PARTS OF ARISTOLOCHIA INDICA L.
Mall Mridula,Tomar Amita,Sushma,Dohare Bindu
International Journal of Research in Ayurveda and Pharmacy , 2011,
Abstract: Aristolochia indica L. (Family Aristolochiaceace) commonly known as Ishwari, Nakuli or Gandhanakuli. It possesses good medicinal value in traditional system of medicine. The present investigation deals with macroscopic, microscopic and phytochemical investigation which includes leaf constants, physiochemical parameters like ash value, extractive value and moisture content. The powdered leaves were subjected to fluorescence analysis with different chemicals. Phytochemical investigations revealed the presence of carbohydrate mainly reducing sugar, alkaloid, steroid, saponin and tannin. The ash value, acid insoluble ash value, water soluble ash value and sulphated ash were observed to be 15.2%, 5.15%, 1.95% and 10.15% respectively. The moisture content, petroleum ether soluble extractive value, benzene soluble extractive value, chloroform soluble extractive value, alcohol soluble extractive value and water soluble extractive value were found to be 3.66%, 0.424%, 2.79%, 15.53% and 8.80% respectively. The present study of macroscopic, microscopic and phytochemical investigation would help in identifying the drug from substitute and adulterants and can be used to prepare a monograph for the proper identification of the plant.
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