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Tirunelveli District, India

Khan M.F.,Sadakathullah Appa College Autonomous | Wesley S.G.,Scott Christian College Autonomous
Radiation Protection Dosimetry | Year: 2011

Activities of 210Po and 210Pb in various tissues of two common species of cephalopod molluscs (cuttlefishes) of Kudankulam coast were studied. Of all the tissues, 210Po and 210Pb were found accumulated more in the digestive gland, shell gland and intestine. Urotheuthis duvauceli accumulated more 210Po and 210Pb in certain organs when compared with Sepiella inermis. The activity ratio of 210Po/210Pb fell within the range of 0.6-29.3 in the organs. The biological concentration factor for the organs ranged from 1.2×103 to 2×105 for 210Po and 3.6×102 to 7.6×104 for 210Pb. A significant variation in the accumulation of 210Po and 210Pb was noted between species, organs and seasons (p < 0.05). The whole-body internal dose rate due to 210Po was 1.24 and 0.83 μGy h-1 and it was 2×10-3 and 3×10-3 μGy h-1 due to 210Pb for both the species. The effective dose in humans due to 210Po intake ranged from 96.3 to 376.6 μSv y-1 and that of 210Pb ranged from 35.2 to 105.7 μSv y-1, respectively. The data generated will act as a reference database for these organisms of this coast in which a nuclear power station is under construction. © Crown copyright 2010. Source

Khan M.F.,Sadakathullah Appa College Autonomous | Godwin Wesley S.,Scott Christian College Autonomous
Marine Pollution Bulletin | Year: 2011

The activities of 210Po and 210Pb were determined in commonly consumed seafoods to evaluate the internal exposure and risk to humans residing Kudankulam coast where a mega nuclear power plant is under construction. The concentration of 210Po in seafoods ranged from 1.2±0.7 to 248±8.1Bqkg-1. Meanwhile, 210Pb ranged between 1.1±0.05 and 14.8±1.6Bqkg-1. The committed effective dose (CED) due to 210Po and 210Pb varied from 11.04 to 515.6 and 3.93 to 23.5μSvyr-1, respectively. The lifetime cancer risk for the public due to 210Po was in the range of 3.47×10-5-1.62×10-3 and it was 4.03×10-5-1.96×10-4 due to 210Pb. The activity intake, effective dose and cancer risk was found lesser than international guidelines and the seafood intake was considered to be safe for human consumption. © 2010 Elsevier Ltd. Source

Janakiraman N.,Nesamony Memorial Christian College | Jasmin Jansi J.,Nesamony Memorial Christian College | Johnson M.,Center for Plant Biotechnology | Zahir Hussain M.I.,Sadakathullah Appa College Autonomous | Jeeva S.,Scott Christian College Autonomous
Anti-Infective Agents | Year: 2014

The present study was intended to reveal the antibacterial activity of various cold organic solvent extracts of Abrus precatorius L. (Fabaceae) and Asystasia gangetica (L.) T. Anderson (Acanthaceae) against the selected pathogens. Powders of whole plant parts of A. precatorius and A. gangetica were extracted with petroleum ether, benzene, chloroform and ethanol at ambient temperature. The dried extracts were tested for antibacterial activity by agar disc diffusion method. Among the different extracts of A. precatorius, ethanolic extracts showed maximum zone of inhibition (21 mm) against Bacillus subtilis followed by 13 mm against Staphylococcus aureus. Broadest spectrum of activity was exhibited in petroleum ether extracts of A. precatorius against different bacterial pathogens (5/7 pathogens). In A. gangetica, benzene extracts exhibited broadest spectrum of activity with the maximum level of inhibition (12 mm) against B. subtilis followed by 11 mm in ethanolic extracts against Salmonella typhi. Petroleum ether extracts of A. gangetica did not show any activity against the selected pathogens. The present study results clearly show that the extracts of A. precatorius and A. gangetica had significant and considerable antibacterial activity against various pathogens and further evaluation is necessary to find out the active principle compound responsible for bioactivity. © 2014 Bentham Science Publishers. Source

Feroz Khan M.,Sadakathullah Appa College Autonomous | Godwin Wesley S.,Scott Christian College Autonomous
Marine Pollution Bulletin | Year: 2012

Protection of non-human biota from ionizing contaminants, especially in the vicinity of nuclear installations is a very important aspect for nuclear engineers and ecologists. In this view, a baseline data on the activity concentration of 210Po and 210Pb were quantified in different tissues of molluscs inhabiting the intertidal region along the coast of Kudankulam. The activity concentration was noticed higher in the organs associated with digestion and metabolism. Filter feeding bivalve molluscs registered the maximum activity of 210Po in their whole body compared to grazing gastropods. 210Po: 210Pb ratio was calculated to be greater than unity in most of the analysed tissues. The ecological sensitivity of molluscs to the radiation exposure and the safeness of the environment was analysed by calculating the external and internal dose rate. The hazard quotient for molluscs was lesser than the global bench mark dose rate of 10μGyh -1. © 2011 Elsevier Ltd. Source

Parveen Sulthana A.,Crop Protection Research Center | Parveen Sulthana A.,Sadakathullah Appa College Autonomous | Martin Rathi J.,Crop Protection Research Center | Sahayaraj K.,Crop Protection Research Center | Sahayaraj K.,Stmarys College Autonomous
Journal of Biopesticides | Year: 2014

Owing to the unique properties, nanomaterials play a major role in many areas of science and technology. In this paper the antiphytopathogenic activity of gallic acid reduced Terminalia chebula Retz. silver nanoparticles (Ag NPs) was studied. AgNO3 (10-3M) stock solution was prepared by dissolving 17mg of silver nitrate in 100ml of double distilled water. 10ml of gallic acid solution isolated from Terminalia chebula Retz. (Combretaceae) was added to 90ml of 10-3M AgNO3solution for reduction of Ag+ions. The reduction of pure Ag+ions was monitored by measuring in the UV-Vis Spectroscopy at 426nm. Determination of the shape and structure of silver nanoparticle was characterized by Transmission Electron Microscopic (TEM) and X-ray Diffraction studies (XRD). The plasma resonance of the gallic acid reduced silver particle is brownish yellow. In the light of these studies, the shape of the silver nanoparticle (spherical) and face centered cubic (FCC) structure were explained. The antibiotic experiment conducted in the present study revealed the antiphytopathogenic activity of gallic acid reduced Terminalia chebula Retz. silver nanoparticles against the phytopathogen Xanthomonos axonopodis pv. malvacearum and also confirmed the antiphytopathogenic activity studies based on “Broth microdilution method” against Xanthomonos axonopodis pv. malvacearum. © 2014, JBiopest. All rights reserved. Source

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