Esakkiammal B.,Sri Parasakthi College for Women
Pollution Research | Year: 2013
The aim of this work was to study the physico-chemical properties of leaf litter wastes. A study was conducted to evaluate the efficiency of an exotic earthworm species Eudrilus eugeniae and an indigenous earthworm species Lampito tnauritii were used for the decomposition of different types of leaf litter wastes into valuable vermicompost. Physico Chemical features of agro wastes before and after composting was analyzed, which increased after vermicomposting. Copyright © EM International.
Manimekalai V.,Sri Parasakthi College for Women |
Ravichandran P.,Manonmaniam Sundaranar University
International Journal of Botany | Year: 2012
Cyperus pangorei is a sedge extensively and exclusively used in silk mat weaving. It is a plant that grows along river banks and canals in rice fields and is considered as a weed, expect for its use in silk mat weaving. The objective of the present study was to analyze the chemical composition and wax micro morphology on the culms (stems) of Cyperus pangorei to decipher its role in silky texture of the mats and to know the abundance of waxes that may find use in commercial applications. Scanning Electron Microscopic (SEM) and GC-MS studies revealed several new chemical entities and their accumulation as cuticular wax layers. The analysis of components and morphological features of epicuticular waxes have provided information on four different classes of waxes and one very long chain wax ester-nona-hexacontanoic acid ester (C 69). The epicuticular waxes determined in this sedge also form first of its kind in Cyperaceae. The wax morphologies observed over the culm do not vary among the different culm regions. Wax morphologies such as thick amorphous film, fissured layers, thick crusts, platelets with orthorhombic symmetry and granules were observed. © 2012 Asian Network for Scientific Information.
Thiyagarajan S.,P.A. College |
Gnanadurai D.,P.A. College |
Malathi S.,Sri Parasakthi College for Women
International Journal of Applied Engineering Research | Year: 2014
Hyper Spectral Images (HSIs) exhibit significant spectral correlation, whose exploitation is crucial for compression. In this paper, a new lossless compression algorithm is proposed for HSIs, which is based on the Modified Ant Colony Optimization (MACO) algorithm and RADON transformation technique. Initially, the given HSI image is preprocessed by using a median filtering technique. After that, the single band image is selected from the original HSI and the color features of that band is extracted by using the HSV model. Then, the MACO algorithm is applied to select the band index based on the fitness value. Subsequently, the single band image is clustered into 6 segments by using the multi-thresholding technique. Furthermore, the RADON transformation and zig-zag encoding techniques are employed to compress the HSI band. Finally, the original band image is reconstructed by performing the zig-zag decoding and inverse RADON transformation techniques. The performance of the proposed system is evaluated in terms of Compression Ratio (CR), Mean Squared Error (MSE) and Peak Signal-to- Noise Ratio (PSNR). The proposed methodology is also compared with the existing methods such as, 3D-SPIHT, JPEG 2000 and 3D-SPECK. From this analysis, it is observed that the proposed method performs well and provides the best results, when compared with the other techniques. © Research India Publications.
Anitha M.,Sri Parasakthi College for Women |
Sakthidevi G.,Ethnopharmacology unit |
Muthukumarasamy S.,Sri Kgsarts College |
Mohan V.R.,Sri Kgsarts College
Journal of Applied Pharmaceutical Science | Year: 2012
The effect of ethanol extract of whole plant of Cynoglossum zeylanicum on Oral Glucose Tolerance was determined. Ethanol extract of Cynoglossum zeylanicum were evaluated for Oral Glucose Tolerance Test (OGTT) in normal and alloxan induced diabetic rats. Oral administration of ethanol extract at doses of 100 &150mg/kg body weight shows that the extract promote glucose uptake. These results suggest that the ethanol extract of Cynoglossum zeylanicum whole plant will be useful in the treatment of impaired oral glucose tolerance.
Thiyagarajan S.,P.A. College |
Dhavamani G.,P.A. College |
Malathi S.,Sri Parasakthi College for Women
Current Medical Imaging Reviews | Year: 2016
Background: The Hyper Spectral Image (HSI) compression is a challenging and demanding task in many remote sensing applications, because it has the large hyperspectral data. Optical remote sensing is much increased due to newly imported sensor technologies and advancements. Lossy HSI compression is an essential part for long-terms spectral storage data. In this paper, we provide a new lossy HSI compression algorithm with the help of Residual Dependent Arithmetic Coder (RDAC). Methods: The main intention of this work is to reduce the complexity while compressing the large volume of data by compressing the spectral bands. Here, the Gray Level Co-occurrence Matrix (GLCM) technique is employed to extract the texture features of the given HSI band image. Then, the k-means clustering algorithm is employed to select the reference band in each cluster based on the cluster prominence value. Moreover, the RDAC is used to compress the reference band and the residual band information of each cluster. Finally, the HSI is decompressed with the help of compressed HSI band images. Results: In experiments, the performance of the proposed method is analyzed and evaluated in terms of Mean Squared Error (MSE), Peak Signal-to-Noise Ratio (PSNR) and Compression Ratio (CR). Moreover, it is compared with some of the existing HSI compression techniques such as, Set Partitioning in Hierarchical Trees (SPIHT), Joint Photographic Expert Group (JPEG), Set Partitioning Embedded bloCK (3D-SPECK), Inverse Wavelet Transform (IWT) and Reverse Karhunen-Loeve Transform (RKLT). Conclusion: This paper proposes a new RDAC technique for lossy HSI compression. For this purpose, different image processing techniques are used. In this analysis, it is proved that the proposed HSI compression technique provides the best results, when compared to the other techniques. © 2016 Bentham Science Publishers.
Umadevi M.,Sri Parasakthi College for Women |
Kesavasamy R.,Sri Ramakrishna Engineering College |
Rathina K.,Kumaraguru College of Technology |
Mahalakshmi R.,Kumaraguru College of Technology
Journal of Molecular Liquids | Year: 2016
The density, viscosity and ultrasonic velocity have been measured for the ternary mixtures of Methyl benzoate, cyclohexane with primary alcohol (1-propanol, 1-butanol, 1-pentanol and 1-hexanol) at 303.15, 308.15 and 313.15K. From the measured values, the acoustical parameters such as adiabatic compressibility (β), free length (Lf), free volume (Vf) have been computed. The excess parameters like excess adiabatic compressibility (βE), excess free length (Lf E), excess free volume (Vf E) and excess internal pressure (πi E) were also calculated in order to investigate the molecular interaction between the components of liquid mixtures. © 2016 Elsevier B.V. All rights reserved.
PubMed | King Saud University, Sri Parasakthi College for Women, Manonmaniam Sundaranar University, Alexandria University and U.S. Department of Agriculture
Type: | Journal: Acta tropica | Year: 2016
The current study investigated the toxic effect of the leaf extract compound andrographolide from Andrographis paniculata (Burm.f) against the dengue vector Ae. aegypti. GC-MS analysis revealed that andrographolide was recognized as the major chemical constituent with the prominent peak area compared with other compounds. All isolated toxic compounds were purified and confirmed through RP-HPLC against chemical standards. The larvicidal assays established at 25ppm of bioactive compound against the treated instars of Ae. Aegypti showed prominent mortality compared to other treated concentrations. The percent mortality of larvae was directly proportional to concentration. The lethal concentration (LC50) was observed at 12ppm treatment concentration. The bioactive andrographolide considerably reduced the detoxifying enzyme regulations of - and - carboxylesterases. In contrast, the levels of GST and CYP450 significantly increase in a dose dependent manner. The andrographolide also showed strong oviposition deterrence effects at the sub-lethal dose of 12ppm. Similarly, the mean number of eggs were also significantly reduced in a dose dependent manner. At the concentration of 12ppm the effective percentage of repellency was greater than 90% with a protection time of 15-210min, compared with control. The histopathology study displayed that larvae treated with bioactive andrographolide had cytopathic effects in the midgut epithelium compared with the control. The present study established that bioactive andrographolide served as a potential useful for dengue vector management.
PubMed | National Institute of Crop Science, Sri Parasakthi College for Women, King Saud University, Manonmaniam Sundaranar University and 3 more.
Type: | Journal: Ecotoxicology and environmental safety | Year: 2016
Botanical insecticides may provide alternatives to synthetic insecticides for controlling Spodoptera litura (F.) and they are target specific, biodegradable, and harmless to mammals. Eight natural chemical compounds with larvicidal activity were identified from fraction F6 of C. guianensis flower extract. Probit analysis of 95% confidence level exposed an LC50 of 223ppm against S. litura third instar larvae. The growth and development of S. litura was affected in sub-lethal concentrations of fraction F6 (50, 100, 150 and 200ppm) compared to controls. Similarly nutritional indices values decreased significantly compared to controls. Fraction F6 also damaged the gut epithelial layer and brush border membrane (BBM). This study also resolved the effects of toxicity to non-target earthworm treated with fraction F6 and chemical pesticides (monotrophos and cypermethrin) and the results showed that fraction F6 had no harmful effect on E. fetida. Further, fraction F6 was eluted and sub fractions F6c (50ppm) showed high mortality against S. litura third instar larvae. Octacosane from fraction F6c was established and confirmed using IR spectrum and HPLC. The time of retention of fraction F6c was confirmed with the octacosane standard. Fraction F6 of C. guianensis extract caused dose-dependent mortality towards S. litura. Octacosane in fraction F6c was establish to be the prominent chemical compound associated with causing mortality but other compounds present in the fraction F6 were shown to be associated with changes in development of S. litura at low dosages. S. litura at low dosage. Therefore, these findings suggest that octacosane may be one of the major insecticidal compounds affecting S. litura survival.
PubMed | King Saud University, Sri Parasakthi College for Women, Manonmaniam Sundaranar University and U.S. Department of Agriculture
Type: | Journal: Chemosphere | Year: 2016
Evaluations of biological effects of (Pb-CVO) the crude volatile oil of Piper betle leaves on the tobacco cutworm Spodoptera litura were conducted. Pb-CVO was subjected to GC-MS analysis and twenty vital compounds were isolated from the betel leaf oil. Pb-CVO was tested at four different concentrations (0.25, 0.5, 1.0 and 1.5%) against S.litura. The treated insects exhibited dose depended mortality. The mortality rate was significantly higher at the 1.0 and 1.5% Pb-CVO. The LC50 (Lethal concentration) were observed at 0.48% Pb-CVO. Larval and pupal durations increased in all treatment concentrations (0.25, 0.3, 0.4 and 0.5%) whereas, pupal weight decreased compared to control. Adult longevity of S.litura was reduced in all treatments but predominantly in the 0.4 and 0.5% Pb-CVO. Correspondingly, mean fecundity rate was reduced at all concentrations compared to control. Histological studies of larvae mid-gut profiles of S.litura were severely damaged in 1.0 and 1.5% and showed abnormalities in mid-gut cells with 0.25 and 0.5% Pb-CVO treatments. Earthworm toxicity illustrated that 0.1% of chemical insecticides (monocrotophos and cypermethrin) varied widely in their contact toxicities compared to 0.5 and 1.0% Pb-CVO and control in both contact filter paper and artificial soil test. These findings suggest that twenty essential compounds of betel leaf oil were significant inhibitors of the development and caused behavioral changes of S.litura. Treatment with betel leaf oil at these concentrations had no adverse effect on earthworm populations.
PubMed | King Saud University, Sri Parasakthi College for Women, Manonmaniam Sundaranar University, Bharathiar University and Kalakad Mundanthurai Tiger Conservation Foundation KMTCF
Type: | Journal: Pesticide biochemistry and physiology | Year: 2016
Plumbagin was isolated and characterized from the roots of Plumbago zeylanica using chromatography: TLC, Column chromatogram, HPLC, FTIR and