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Cochin, India

Antony. A A.A.,St Alberts College | Nampy S.,University of CalicutKerala
Phytotaxa | Year: 2014

Capsule and seed morphology of 26 species of Murdannia in India are studied using light microscopy and seeds of 23 species by scanning electron microscopy. The capsules show differences in size, shape and in the number and arrangement of seeds in the locules. The seeds also display considerable variation in size, shape, ornamentation, shape of hilum and position of embryotega. The present study provides useful characters for the delimitation of Indian species of Murdannia. © 2014 Magnolia Press. Source

Vinayasree S.,Cochin University of Science and Technology | Vinayasree S.,Government Victoria College | Soloman M.A.,St Alberts College | Sunny V.,P.A. College | And 3 more authors.
Composites Science and Technology | Year: 2013

Flexible and thin single layer microwave absorbers based on strontium ferrite-carbon black-nitrile rubber composites have been fabricated employing a specific recipe and their reflection loss characteristics were studied in the S (2-4. GHz) and X-bands (8-12. GHz). The incorporation of carbon black not only reinforces the rubber by improving the mechanical properties of the composite but also modifies the dielectric permittivity of the composite. Strontium ferrite when impregnated into a rubber matrix imparts the required magnetic permeability to the composite. The combination of strontium ferrite and carbon black can then be employed to tune the microwave absorption characteristics of the resulting composite. The complex dielectric permittivity and permeability were measured by employing a cavity perturbation technique. The microwave absorption characteristics of composites were modelled in that an electromagnetic wave incident normally on the metal terminated single layer absorber. The influence of filler volume fraction, frequency, absorber thickness on the bandwidth of absorption are discussed and correlated. © 2013 Elsevier Ltd. Source

Jacob S.,Cochin University of Science and Technology | Suma K.K.,Cochin University of Science and Technology | Suma K.K.,Maharajas College | Mendez J.M.,Cochin University of Science and Technology | And 2 more authors.
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2010

Polymer composites reinforced by both the micro and nano fillers is the subject of this paper. Polypropylene (PP)-nylon micro-fibre composites modified with nanosilica and modified nanosilica (using silane coupling agent) were prepared by melt compounding. The nanosilica prepared in the laboratory was used as reinforcing filler in PP-nylon fibre composites. The compounding characteristics and mechanical properties of the composites were studied. The equilibrium torque during compounding increased with the addition of nanosilica and modified nanosilica. The use of two types of fillers leads to synergistic effect on the mechanical properties of the composite. Composites with 1 wt.% nanosilica and 30 wt.% nylon fibre show high tensile strength, tensile modulus, flexural strength and flexural modulus. Composites modified with 1 wt.% nanosilica and 10 wt.% nylon fibre-PP composite show higher impact strength. © 2009 Elsevier B.V. All rights reserved. Source

Fernandez S.,St Alberts College
AIP Conference Proceedings | Year: 2010

The major hurdle of a city planning council is to handle the traffic jam problem. The number of vehicles on roads increases day by day. Also the number of vehicles is directly proportional to the width of the road (including that of parallel roads). But it is not always possible to make roads or to increase width of the road corresponding to the increase in the number of vehicles. Also we cannot tell a person not to buy a vehicle. So trying to minimise the traffic jam is the only possible way to overcome this hurdle. Here we try to develop a method to avoid traffic jam through a mathematical approach (through fuzzy applications). This method helps to find a suitable route from an origin to a destination with lesser time than other routes. © 2010 American Institute of Physics. Source

Fung A.W.S.,University of Alberta | Ebhardt H.A.,University of Alberta | Ebhardt H.A.,ETH Zurich | Krishnakumar K.S.,CNRS Institute of Molecular and Supramolecular Chemistry and Biochemistry | And 5 more authors.
Protein and Peptide Letters | Year: 2014

Aminoacyl-tRNA protein transferases post-translationally conjugate an amino acid from an aminoacyl-tRNA onto the N-terminus of a target polypeptide. The eubacterial aminoacyl-tRNA protein transferase, L/F transferase, utilizes both leucyl-tRNALeu and phenylalanyl-tRNAPhe as substrates. X-ray crystal structures with substrate analogues, the minimal substrate phenylalanyl adenosine (rA-Phe) and inhibitor puromycin, have been used to characterize tRNA recognition by L/F transferase. However analyses of these two X-ray crystal structures reveal significant differences in binding. Through structural analyses, mutagenesis, and enzymatic activity assays, we rationalize and demonstrate that the substrate analogues bind to L/F transferase with similar binding affinities using a series of different interactions by the various chemical groups of the analogues. Our data also demonstrates that enlarging the hydrophobic pocket of L/F transferase selectively enhances puromycin inhibition and may aid in the development of improved inhibitors for this class of enzymes. © 2014 Bentham Science Publishers. Source

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