oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 49 )

2018 ( 783 )

2017 ( 721 )

2016 ( 1071 )

自定义范围…

匹配条件: “Umamaheswari A” ,找到相关结果约461108条。
列表显示的所有文章,均可免费获取
第1页/共461108条
每页显示
Evaluation of antibacterial activity of Boerhaavia diffusa L. leaves
Umamaheswari A,Nuni A,Shreevidya R
International Journal of Green Pharmacy , 2010,
Abstract: The aim of the present study was to evaluate the qualitative analysis of phytochemicals and antimicrobial activity of various solvent extracts of Boerhaavia diffusa L. (Family: Nyctaginaceae) leaves. The antimicrobial activity of different solvent extracts of B. diffusa L. leaves were tested against the Gram-positive and Gram-negative bacterial strains by observing the zone of inhibition. The Gram-positive bacteria used in the test were Staphylococcus aureus, Bacillus subtilis, Streptococcus faecalis and Micrococcus luteus, and the Gram-negative bacteria were Escherichia coli, Pseudomonas aeruginosa, Salmonella typhii, Klebsiella pneumoniae, Proteus vulgaris, Serratia marcescens, Shigella flexneri and Vibrio cholerae. It was observed that ethanol, methanol, chloroform, ethylacetate and aqueous extracts showed activity against Gram-positive and Gram-negative bacteria. The ethanol extract of B. diffusa L. leaves showed more activity against Gram-positive (e.g. S. aureus, zone of diameter 11 mm) and Gram-negative bacteria (e.g. E. coli, zone of diameter 9 mm) when compared to other solvent extracts except V. cholerae. The results confirmed the presence of antibacterial activity of B. diffusa L. leaves extract against various human pathogenic bacteria.
In silico approach for future development of subunit vaccines against Leptospira interrogans serovar Lai
Rakesh S.,Pradhan D.,Umamaheswari A.
International Journal of Bioinformatics Research , 2009,
Abstract: Leptospirosis continues to have major impacts on people of developing countries with inestimablemorbidity and mortality. As current leptospirosis vaccination is relatively unsuccessful, development ofefficacious vaccines through novel means became utmost priority for prevention of frequent outbreaks of thedisease. Herein, MHC class II restricted peptide epitopes were identified from pathogenic Leptospiralmembrane proteins to suggest T-cell epitope driven leptospirosis vaccines through reverse vaccinology. Theproteome of Leptospira interrogans serovar Lai was screened to select 137 membrane proteins. JembossAntigenic server was employed to find antigenic peptides, followed by ProPred analysis to predict 30 shortpeptides having strong binding affinity with HLA DRB1*0101, DRB1*0401 and DRB1*1501 alleles.Predictions were revised to pick antigenic peptides with same core region binding with the selected HLADRB1alleles and ten such peptides were found from seven proteins. Further, to confirm the interaction atstructure level, Leptospira excinuclease ABC subunit B protein having short T-cell antigenic peptide (133-REDVVIVSSVSCIYGLG-149) was modeled using Modeller9v7. The model reliability was evaluated throughProcheck, ProSA and ProQ. Docking calculations for selected HLA DRB1 alleles (receptor) and modeledLeptospira excinuclease ABC subunit B protein (ligand) were carried out using Hex 5.1. The protein -proteininteraction revealed that the core region (136-VVIVSSVSC-144) of the antigenic peptide (133-REDVVIVSSVSCIYGLG-149) was well interacting with the receptors. Through the reverse vaccinologyapproach and docking studies, the short antigenic peptide 133-REDVVIVSSVSCIYGLG-149 of Leptospiraexcinuclease ABC subunit B is proposed as a potential novel T-cell driven subunit vaccine againstleptospirosis.
Production of an Extra Cellular Feather Degrading Enzyme by Bacillus licheniformis Isolated from Poultry Farm Soil in Namakkal District (Tamilnadu)
P. Tamilmani,A. Umamaheswari,A. Vinayagam,B. Prakash
International Journal of Poultry Science , 2008,
Abstract: Chicken feather is recognized as a solid waste generated from poultry farms and is abundant in Namakkal district, Tamilnadu, India. Feather is commonly treated by high temperature and pressure; it is used as animal food stuffs. However, feather degradation by biological methods has been increasingly interested because of environmental awareness. In this study, unidentified bacterial strains isolated from soil samples. They had show ability of feather degradation by making a clear zone around their colonies in FMA medium. The zoned isolates were identified by morphological and biochemical tests. The Bacillus licheniformis were also examined for keratinase production by shake flask fermentation in a basal medium containing 1% feather. The fermentation mediums were optimized. Fermentation process was carried out at 37°C for 7 days at 150 rpm. Crude keratinase were extracted and purified by salt precipitation, dialysis and column chromatography and measured the activity of keratinase.
Antibacterial properties of Passiflora foetida L. – a common exotic medicinal plant
C Mohanasundari, D Natarajan, K Srinivasan, S Umamaheswari, A Ramachandran
African Journal of Biotechnology , 2007,
Abstract: Passiflora foetida L. (stinking passion flower) is an exotic medicinal vine. The antibacterial properties of leaf and fruit (ethanol and acetone) extracts were screened against four human pathogenic bacteria i.e. Pseudomonas putida, Vibrio cholerae, Shigella flexneri and Streptococcus pyogenes by well-in agar method. The results showed the leaf extract having remarkable activity against all bacterial pathogens compared to fruits. This study supports, the traditional medicines (herbal extracts) to cure many diseases like diarrhea, intestinal tract, throat, ear infections, fever and skin diseases.
Medicinal Use of Camellia sinensis on Lactose Intolerance
M. Amutha,R. Arunachalam,M. Umamaheswari,A. Usharamalakshmi
Journal of Biological Sciences , 2010,
Abstract: The present investigation was aimed at to test different Camellia sinensis (tea) extracts such as Magholai (I), 3 roses (II) and chakra gold (III) for their lactose reduction capability in milk with more lactose. Cow, goat, buffalo and two commercial milk samples such as KC and Star were tested for its lactose content. Among these buffalo milk as used as a control due to its high content of lactose (8 mL dL-1). Buffalo milk was treated by tea extracts I, II and III and 0.018, 0.018 and 0.042 mg dL-1 of lactose content were found. Its reveals that the lactose content of milk was well reduced by adding tea extracts and also its suggested peoples to have milk with herbal extracts (tea) who have gastrointestinal problems.
Performance Analysis of Multi Level Inverter with DC Link Switches for Renewable Energy Resources
PG Student. Karthika N,,Asst. Prof. Sangari A,,Prof. Dr. R. Umamaheswari
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: The main objective for a grid‐tied Photo Voltaic (PV) inverter is to feed the harvested energy from PV panel to the grid with high efficiency and high power quality. This paper reveals a novel modulation scheme called single carrier Phase Opposition Disposition (POD) Pulse Width Modulation (PWM) technique for H Bridge Multi Level Inverter topology for the solar plants that can account for voltage profile fluctuations among the panels during the day and the performance is studied by comparing total harmonic distortion and switching losses at different switching frequencies. The operating principle and performance of the proposed inverter is verified through simulation studies.
Association Analysis on Generalized Object-Relational Data Model of Cricket Video Annotations
P. UmaMaheswari,M. Rajaram
International Journal of Soft Computing , 2012,
Abstract: The ORDB model extends the relational model by providing a rich data type for handling complex objects and object orientation. The major limitation of many commercial data mining algorithms and tools leads to the thought of generalizing the Object -data base. The handling of complex data such as objects effectively is still remaining as a challenging research issue. Data generalization in databases can handle complex data types of the attributes and their aggregations, as necessary and summarizes the information in a relational database by repeatedly replacing specific attribute values with more general concepts according to user-defined concept hierarchies. Mining on video data remains a challenging issue in spite of storing and handling of visual data is very difficult on account of their complex organization structure and Lag of support of existing mining techniques. In this study, video annotation data of a serious of cricket matches are handled effectively in the form of objects that are stored in an Object-relational data base. The association relationships among the action patterns of cricket match are extracted in the form of association rules which are then be represented in the form of textual information. In order to handle the complexity and to make the Object-Relational model of video annotations in the form appropriate for implementing the existing "Apriori algorithm", a generalization technique called "Attribute Focusing and Retrieval" is applied. The associations that are found out of this mining activity can then be converted into useful information, which may help the coaches to train the team to lead for success.
Transducer Interface Module for Smart Control of DC/DC Converter System
B. Umamaheswari,J. Kamala
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
Quadratic Program Optimization using Support Vector Machine for CT Brain Image Classification
J.Umamaheswari
International Journal of Computer Science Issues , 2012,
Abstract: In this paper, an efficient Computer Tomography (CT) image classification using Support Vector Machine (SVM) with optimized quadratic programming methodology is proposed. Due to manual interpretation of brain images based on visual examination by radiologist/physician that cause incorrect diagnosis, when a large number of CT images are analyzed. To avoid the human error, an automated optimized classification system is proposed for abnormal CT image identification. This is an automated system for content based image retrieval with better classifier accuracy and prediction time. SVM classifier can accurately train up the datas as normal and abnormal brains interpreted manually by the user. The system can retrieve more number of images present in the query data base. The proposed classifier is analyzed with existing Sequential Minimal Optimization (SMO) and K Nearest Neighbour classifier KNN). From the experimental analysis, the proposed classifier outperforms all other classifier taken for examination.
Performance Oriented Query Processing In GEO Based Location Search Engines
M. Umamaheswari,S. Sivasubramanian
Computer Science , 2010,
Abstract: Geographic location search engines allow users to constrain and order search results in an intuitive manner by focusing a query on a particular geographic region. Geographic search technology, also called location search, has recently received significant interest from major search engine companies. Academic research in this area has focused primarily on techniques for extracting geographic knowledge from the web. In this paper, we study the problem of efficient query processing in scalable geographic search engines. Query processing is a major bottleneck in standard web search engines, and the main reason for the thousands of machines used by the major engines. Geographic search engine query processing is different in that it requires a combination of text and spatial data processing techniques. We propose several algorithms for efficient query processing in geographic search engines, integrate them into an existing web search query processor, and evaluate them on large sets of real data and query traces.
第1页/共461108条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.