Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 5 )

2019 ( 579 )

2018 ( 706 )

2017 ( 697 )

Custom range...

Search Results: 1 - 10 of 401378 matches for " M.Sukumar "
All listed articles are free for downloading (OA Articles)
Page 1 /401378
Display every page Item
Phytochemical, HPTLC finger printing and antibacterial activity of Acacia nilotica (L.) Delile
R.Venkataswamy,M.Sukumar,A.Doss, H. Mohamed Mubarack
Hygeia : Journal for Drugs and Medicines , 2010,
Abstract: The leaves of Acacia nilotica (L.) Delile was extracted with methanol and aqueous medium and studied for in vitro antimicrobial property. The methanol extract was found to be most active against all the bacterial species tested except S.aureus. Active methanol extract was further studied for HPTLC fingerprint and by phytochemical analysis. HPTLC analysis confirmed segregation of four individual compounds with individual Rf values and peak area percentage. The results of phytochemical screening of extract revealed the presence of Tannins, Carbohydrates and Glycosides. This analysis revealed the high antibacterial activity in the methanol extract of Acacia nilotica (L.) Delile
Metaheuristic Based Noise Identification and Image Denoising Using Adaptive Block Selection Based Filtering  [PDF]
M. Sasikala Devi, R. Sukumar
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79235
Abstract: Image denoising has become one of the major forms of image enhancement methods that form the basis of image processing. Due to the inconsistencies in the machinery producing these signals, medical images tend to require these techniques. In real time, images do not contain a single noise, and instead they contain multiple types of noise distributions in several indistinct regions. This paper presents an image denoising method that uses Metaheuristics to perform noise identification. Adaptive block selection is used to identify and correct the noise contained in these blocks. Though the system uses a block selection scheme, modifications are performed on pixel- to-pixel basis and not on the entire blocks; hence the image accuracy is preserved. PSO is used to identify the noise distribution, and appropriate noise correction techniques are applied to denoise the images. Experiments were conducted using salt and pepper noise, Gaussian noise and a combination of both the noise in the same image. It was observed that the proposed method performed effectively on noise levels up-to 0.5 and was able to produce results with PSNR values ranging from 20 to 30 in most of the cases. Excellent reduction rates were observed on salt and pepper noise and moderate reduction rates were observed on Gaussian noise. Experimental results show that our proposed system has a wide range of applicability in any domain specific image denoising scenario, such as medical imaging, mammogram etc.
Reduction of hexavalent chromium by Rhizopus Oryzae
M Sukumar
African Journal of Environmental Science and Technology , 2010,
Abstract: The ability of Rhizopus oryzae to reduce Cr6+ was evaluated in batch microcosms. The optimum pH of R. oryzae growth was between 6.0 and 7.0. The maximum chromium reduction efficiency of 91.15% and biomass growth was achieved at a pH of 7, temperature of 37°C, with an initial Cr6+ concentration of 400 ppm and incubation period of 72 h. Monod and Haldane models were used to describe the chromium reduction data and the specific growth rate constant value was calculated as 0.082 and the reduction rate was found to be highest at 400 mg Cr6+ /l. The high removal of chromate by R. oryzae indicates a feasible, economical technique for chromate removal from industrial wastewater effluents.
Human Exposure Assessment of Element Pollution for Environmental Health Implications: Teeth as a Biomonitoring Tool  [PDF]
Athimoolam Sukumar
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.63005
Reference values reflecting the findings of natural concentrations of teeth in a well-defined group of individuals, are indispensable, if one is to interpret results generated for clinical utility. Hence, a comprehensive compilation of literature survey is attempted to make available as a reference guideline for tooth element concentrations. Presently, the reference values are proposed for 19 elements. Several factors that are found influencing element levels, are common to any biosample and are broadly grouped under four categories namely, the factors of teeth, donor, environment and analytical methods. How best the influencing factors to be considered during analysis, are discussed. It is elucidated that standardized method of analysis with quality assurance and precision will reduce the ambiguity of comparison of inter-laboratory measurement. When the merits and demerits of element measurements are evaluated, it is recognized that except a hurdle of difficult specific sampling, many advantages make teeth an attractive material for environmental health monitoring of population and for assessment of element status of deficiency and excess due to differential exposure. The available data of tooth elements are lesser in comparison to data of blood and hair; further studies are required for reference values of others elements and for distribution pattern in different conditions, parts and types of teeth.
Proportion, pattern and need assessment of deformities among registered leprosy affected individuals in Chamrajanagar district
Sukumar Gautham,Shivaraj N,Dayananada M
Indian Journal of Community Medicine , 2010,
Majorana spin-flip transitions in a magnetic trap
D. M. Brink,C. V. Sukumar
Physics , 2006, DOI: 10.1103/PhysRevA.74.035401
Abstract: Atoms confined in a magnetic trap can escape by making spin-flip Majorana transitions due to a breakdown of the adiabatic approximation. Several papers have studied this process for atoms with spin $F = 1/2$ or $F= 1$. The present paper calculates the escape rate for atoms with spin $F > 1$. This problem has new features because the perturbation $\Delta T$ which allows atoms to escape satisfies a selection rule $\Delta F_z = 0, \pm 1, \pm 2$ and multi-step processes contribute in leading order. When the adiabatic approximation is satisfied the leading order terms can be summed to yield a simple expression for the escape rate.
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: The eventual pursuit for self and its accomplishment is found in Toni Morrison's Song of Solomon (1977) an award winning novel. It narrates the hero's search for cultural identity. Milkman's journey explains the importance of the historical and cultural self and his responsibility to reconnect the loose historical cords of his memory. The quest of the hero built in bildungsroman is combined with the identity theme. Sexism is subservient to racism and capitalism in Song of Solomon because Toni Morrison realizes the fact, that the exploitation of African woman is the result of black man's national and class oppression. National and class oppression is experienced by the African in the United States. The African female is exploited by the African male due to this oppression. Toni Morrison's awareness enables her to create Pilate, a female protagonist, who takes pride and dignity in her Africanness. It is Pilate who teaches Milkman the first lesson in race and class consciousness. Mentors are 'the secondary characters who help the protagonist as lovers, educators and friends.
Preliminary phytochemical screening and antimicrobial studies of Lantana indica roxb
Venkataswamy R,Doss A,Sukumar M,Mubarack H
Indian Journal of Pharmaceutical Sciences , 2010,
Abstract: The aim of the present study was to investigate the antimicrobial and preliminary phytochemical properties of Lantana indica Roxb. The aqueous and organic solvent (ethyl acetate and methanol) extracts from the leaves of Lantana indica (Verbenaceae) were tested against Staphylococcus aureus, Bacillus subtilis, Steptococcus pyrogens, Escherichia coli, Proteus vulgaris, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella typhi, Aspergillus niger and Candida albicans by agar well diffusion method. The results showed promising antibacterial activity against the tested bacteria. Among these, methanol and aqueous extracts were found to possess a more potent inhibitory effect when compared to the ethyl acetate extract. Preliminary phytochemical analysis of extracts revealed the presence of antimicrobial compounds such as carbohydrates, proteins, tannins and flavonoidal glycosides. The result of this study validates the use of methanol and aqueous extract of this species in ethnomedicine, favouring the isolation of antibacterial agents from the leaf extract of Lantana indica.
SUSY transformation of the Green function and a trace formula
B F Samsonov,C V Sukumar,A M Pupasov
Mathematics , 2005, DOI: 10.1088/0305-4470/38/34/009
Abstract: An integral relation is established between the Green functions corresponding to two Hamiltonians which are supersymmetric (SUSY) partners and in general may possess both discrete and continuous spectra. It is shown that when the continuous spectrum is present the trace of the difference of the Green functions for SUSY partners is a finite quantity which may or may not be equal to zero despite the divergence of the traces of each Green function. Our findings are illustrated by using the free particle example considered both on the whole real line and on a half line.
Factors Influencing Radon (222Ra) Levels of Water: An International Comparison  [PDF]
M. Nagaraja, A. Sukumar, V. Dhanalakshmi, S. Rajashekara
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.75008
Radon levels were measured in 59 water samples of rural and urban places of Bangalore city following procedures of standardized techniques. Though water level of radon above 100 Bqll-1 of WHO is ascribed to causes of lung cancer and leukaemia, very low levels were found in different urban and rural places, but urban-rural gradient observed significantly higher urban levels than rural levels. Correlation between depth of water sampled and radon levels estimated indicates that in urban places, lower water depth is related to higher radon levels, while it is vice versa in rural. It is due to more water use for rural agriculture and more urban water pollution and granite quarries. In comparison to other countries, it is observed that water radon levels are at wide ranges from the lowest to the highest estimated with different techniques and differ due to types of water, soil, rocks and sampling season.
Page 1 /401378
Display every page Item

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