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Kāyankulam, India

Bhadrakumari S.,Msm College | Predeep P.,National Institute of Technology Calicut
Journal of Superconductivity and Novel Magnetism | Year: 2010

A novel technique for preparing YBCO/polymer composites showing true superconducting transition above liquid nitrogen temperature has been developed. A thermoplastic polymer, poly(methyl methacrylate) (PMMA), was used to improve the flexural properties of the high-temperature superconducting ceramic YBCO. The superconductor/polymer composites exhibited superconducting resistive transition at about 90∈K. The scanning electron micrograph reveals excellent wetting, infiltration, and polymerization of the monomer into the superconducting material. Polymer impregnation has no measurable effect on the critical transition temperature, the width of transition, and Meissner effect. © 2009 Springer Science+Business Media, LLC.

Bindu L.,Kerala Agricultural University | Bindu L.,Msm College | Padmakumar K.G.,Kerala Agricultural University | Sreerekha P.S.,Kerala Agricultural University | Joseph N.,Kerala Agricultural University
Journal of Applied Ichthyology | Year: 2012

To study the reproductive biology of Horabagrus brachysoma (Günther, 1864), monthly samples were collected from the riverine stretches of Lake Vembanad during 2001-2002. The sexes can be distinguished only during the breeding season; male to female ratio in the exploited catch was 1:1.97. The mean L T at first maturity (L 50) was 18.5cm in females and 17.5cm in males. Absolute fecundity varied between 1100 and 124000, with a mean of 20472. The ovary showed group synchronous development and the oocyte diameter varied between 0.13 and 1.63mm. The relatively high fecundity and hardy nature of H. brachysoma may favour the expansion of this indigenous catfish throughout the culture systems. © 2012 Blackwell Verlag, Berlin.

Amina S.,Msm College
Journal of Advanced Zoology | Year: 2013

A study on seasonal distribution of Bacillariophyceae on Kayamkulam Back water reveals that twenty four genera were present In the Lake. They were conspicuous by their regular appearance throughout the period of Investigation. Bacillariophyceae exhibited a single dominant peak in all the stations during the month of March and April. In the current observation maximum number of Diatoms were documented during post-monsoon seasons more or less In all the stations. Diatoms value is strongly correlated with dissolved oxygen values at stations. Analysis further revealed the Phytoplankton fluctuations on long-term trends. We conclude that global Phytoplankton concentration has declined over the past century; this decline will lead to be considered in future studies of marine ecosystems, geochemical cycling, ocean circulation and fisheries.

Vysakh A.,Thomas College | Ratheesh M.,Thomas College | Pramod C.,Kerala University | Premlal S.,Drug Standardization Unit | And 2 more authors.
International Immunopharmacology | Year: 2014

We evaluated the protective efficacy of the polyphenolic fraction from virgin coconut oil (PV) against adjuvant induced arthritic rats. Arthritis was induced by intradermal injection of complete Freund's adjuvant. The activities of inflammatory, antioxidant enzymes and lipid peroxidation were estimated. PV showed high percentage of edema inhibition at a dose of 80 mg/kg on 21st day of adjuvant arthritis and is non toxic. The expression of inflammatory genes such as COX-2, iNOS, TNF-α and IL-6 and the concentration of thiobarbituric acid reactive substance were decreased by treatment with PV. Antioxidant enzymes were increased and on treatment with PV. The increased level of total WBC count and C-reactive protein in the arthritic animals was reduced in PV treated rats. Synovial cytology showed that inflammatory cells and reactive mesothelial cells were suppressed by PV. Histopathology of paw tissue showed less edema formation and cellular infiltration on supplementation with PV. Thus the results demonstrated the potential beneficiary effect of PV on adjuvant induced arthritis in rats and the mechanism behind this action is due to its antioxidant and anti-inflammatory effects. © 2014 Elsevier B.V.

Bhadrakumari S.,Msm College | Predeep P.,National Institute of Technology Calicut
Journal of Superconductivity and Novel Magnetism | Year: 2011

Ceramic-polymer composites using conducting YBa 2Cu 3O 7-x (YBCO) powder have been fabricated. Atomic force microscopy (AFM) and Scanning electron microscopy (SEM) images are used to provide new information about the more influent microstructural features. The effect of microstructure on percolation is studied for all the composites. Results indicate that percolation and subsequent positive temperature coefficient (PTC) behavior are related to the powder characteristics, composite microstructure, and ceramic-polymer interface. The reproducibility of the resistivity-temperature behavior for the polyethylene composites upon thermal cycling is illustrated and found that the room temperature resistivity increases by about 1 order of magnitude from the first to the forth cycle. © 2010 Springer Science+Business Media, LLC.

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