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Search Results: 1 - 10 of 461724 matches for " A. Umamaheswaran "
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Covers and Envelopes of $\mathcal{X}$-injective and $\mathcal{U}_\mathcal{X}$-projective modules
C. Selvaraj,A. Umamaheswaran,R. Udhayakumar
Mathematics , 2015,
Abstract: In this paper, we investigate the notions of $\mathcal{U}_\mathcal{X}$-projective, $\mathcal{X}$-injective and $\mathcal{X}$-flat modules and give their characterizations, where $\mathcal{X}$ is the class of left $R$-modules. We prove the class of all $\mathcal{U}_\mathcal{X}$-projective modules is Kaplansky and show the existence of $\widetilde{\mathcal{U}_\mathcal{X}}$-covers and $\mathcal{U}_\mathcal{X}$-envelopes over a $\mathcal{U}_\mathcal{X}$-hereditary ring $R.$ Moreover, we prove that decomposition of a $\mathcal{U}_\mathcal{X}$-projective module into a projective and a coreduced $\mathcal{U}_\mathcal{X}$-projective module over a self $\mathcal{X}$-injective and $\mathcal{U}_\mathcal{X}$-hereditary ring. Finally, we prove that every module has an $\mathcal{X}$-injective cover over a Noetherian ring $R,$ where $\mathcal{X}$ is the class of all pure projective modules.
Reliable Data Transfer on Dynamic Nodes using Packed Hiding Methods in Ad Hoc Networks
International Journal of Innovative Research in Science, Engineering and Technology , 2013,
Abstract: This paper addresses the problem of delivering data packets for highly dynamic mobile ad hoc networks in a reliable and timely manner. Most existing ad hoc routing protocols are susceptible to node mobility, especially for large-scale networks. Driven by this issue, we propose an efficient Position-based Opportunistic Routing (POR) protocol which takes advantage of the stateless property of geographic routing and the broadcast nature of wireless medium. When a data packet is sent out, some of the neighbour nodes that have overheard the transmission will serve as forwarding candidates, and take turn to forward the packet if it is not relayed by the specific best forwarder within a certain period of time. By utilizing such in-the-air backup, communication is maintained without being interrupted. This intentional interference with wireless transmissions can be used as a launch pad for mounting Denial-of-Service attacks on wireless networks. Typically, jamming has been addressed under an external threat model. However, adversaries with internal knowledge of protocol specifications and network secrets can launch low-effort jamming attacks that are difficult to detect and counter. In this work, we address the problem of selective jamming attacks in wireless networks.
Biological and molecular characterization of a Tospovirus isolate from tomato and its relationship with other Tospoviruses
Indian Phytopathology , 2012,
Abstract: A Tospovirus was isolated from tomato (Lycopersicon esculentum Mill) plants showing severe necrosis of leaves and growing buds. Host range studies indicated that the tomato Tospovirus isolate was closely related to Groundnut bud necrosis virus (GBNV). Sequence analyses of nucleocapsid protein (N) gene showed that the amino acid sequence identity with GBNV was 96% while the identities with other Tospoviruses were in the range of 16-85%. On this basis, it is concluded that the tomato Tospovirus should be considered as a strain of GBNV and designated as GBNV-To.
Necrosis disease on cowpea, mungbean and tomato is caused by Groundnut bud necrosis virus
Indian Phytopathology , 2012,
Antibiotic Resistance Genes Online (ARGO): A Database on vancomycin and b-lactam resistance genes
Joy Scaria,Umamaheswaran Chandramouli2,Sanjay Kumar Verma
Bioinformation , 2005,
Abstract: Vancomycin and b-lactams are antibiotics that inhibit gram positive bacteria by interfering with cell wall synthesis. However, continuous use of antibiotics results in the emergence of multi-drug resistant (MDR) bacterial strains. Here, we describe ARGO, a database containing gene sequences conferring resistance to these two classes of antibiotics. It is designed as a resource to enhance research on the prevalence and spread of antibiotic resistance genes. ARGO is the first attempt to compile the resistance gene sequence information with state specific information.
Gly460Trp polymorphism of the ADD1 gene and essential hypertension in an Indian population: A meta-analysis on hypertension risk
Ramu P,Umamaheswaran G,Shewade D,Swaminathan R
Indian Journal of Human Genetics , 2010,
Abstract: Background: Essential hypertension is a complex genetic trait. Genetic variant of alpha adducin (ADD1) gene have been implicated as a risk factor for hypertension. Given its clinical significance, we investigated the association between ADD1 Gly460Trp gene polymorphism and essential hypertension in an Indian population. Further, a meta-analysis was carried out to estimate the risk of hypertension. Methods: In the current study, 432 hypertensive cases and 461 healthy controls were genotyped for the Gly460Trp ADD1 gene polymorphism. Genotyping was determined by real time PCR using Taqman assay. Multiple logistic regression analysis was used to detect the association between Gly460Trp polymorphism and hypertension. Results: No significant association was found in the genotype and allele distribution of Gly460Trp polymorphism with hypertension in our study. A total of 15 case-control studies were included in the meta-analysis. There was no evidence of the association of Gly460Trp polymorphism with hypertension in general or in any of the sub group. Conclusions: We found that the Gly460Trp polymorphism is not a risk factor for essential hypertension in a south Indian Tamilian population. However, the role of ADD1 polymorphism may not be excluded by a negative association study. Further, large and rigorous case-control studies that investigate gene-gene-environment interactions may generate more conclusive claims about the molecular genetics of hypertension.
The Spread of Infectious Disease on Network Using Neutrosophic Algebraic Structure  [PDF]
A. Zubairu, A. A. Ibrahim
Open Journal of Discrete Mathematics (OJDM) , 2017, DOI: 10.4236/ojdm.2017.72009
Abstract: Network theory and its associated techniques has tremendous impact in various discipline and research, from computer, engineering, architecture, humanities, social science to system biology. However in recent years epidemiology can be said to utilizes these potentials of network theory more than any other discipline. Graph which has been considered as the processor in network theory has a close relationship with epidemiology that dated as far back as early 1900 [1]. This is because the earliest models of infectious disease transfer were in a form of compartment which defines a graph even though adequate knowledge of mathematical computation and mechanistic behavior is scarce. This paper introduces a new type of disease propagation on network utilizing the potentials of neutrosophic algebraic group structures and graph theory.
A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation  [PDF]
S. A. A. Sajadi
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22013
Abstract: A comparative research has been developed for acidity and stability constants of M(Glu)1, M(Asp)2 and M(Ttr)3 complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) com-plexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(Asp), some metal ions are able to build chelate over amine groups. The results mentioned-above demonstrate that for some M(Glu) and M(Asp) complexes, the stability constants are also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions, and transfers them through building complexes accompanied with glutamate and aspartate. For heavy metal ions, this building complex helps the absorption and filtration of the blood plasma, and consequently, the excursion of heavy metal ions takes place. This is an important method in micro-dialysis. In this study the different as-pects of stabilization of metal ion complexes regarding to Irving-Williams sequence have been investigated.
Determining the Basaltic Sequence Using Seismic Reflection and Resistivity Methods  [PDF]
A. Alanezi, A. Qadrouh
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B004

This study was carried out in Harat Rahat (south of Almadinah Almonwarah) using seismic reflection and resistivity methods. The main objectives of this study are to determine the extent of the basaltic layer and to define the subsurface faults and fractures that could affect and control the groundwater movement in the study area. A 2D seismic profile was acquired and the result shows that the subsurface in the study area has a major fault. We obtained a well match when the seismic result was compared with drilled wells. As a complementary tool, the resistivity method was applied in order to detect the groundwater level. The results of the resistivity method showed that six distinct layers have been identified. The interpretation of these six layers show that the first three layers, the fourth layer, the fifth layer and the bottom of the section indicated various subsurface structures and lithologies; various basaltic layers, fractured basalt, weathered basement and fresh basaltic layers, respectively. It is obvious that the eventual success of geophysical surveys depend on the combination with other subsurface data sources in order to produce accurate maps.

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