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Princy K.G.,Carmel College | Joseph R.,Cochin University of Science and Technology | John H.,Cochin University of Science and Technology | Mathew K.T.,Cochin University of Science and Technology
Bulletin of Materials Science | Year: 2010

Poly(p-phenylenediazomethine) was synthesized by the condensation reaction between glyoxal and p-phenylene diamine in different solvents like methanol, toluene, m-cresol and N,N-dimethylformamide. The dielectric properties and microwave conductivity of the pelletized samples were measured using cavity perturbation technique. The measurements were done at 2.17 GHz at room temperature (25°C). The effect of dopants on the dielectric properties and conductivity was studied using HCl and HClO4. Dielectric properties like dielectric constant, dielectric loss factor and microwave conductivity increased on doping with HCl and HClO4. Conducting polymer composites were prepared by in situ polymerization of glyoxal and p-phenylenediamine in different solvents containing different amounts of PVC, and silica. The microwave conductivity and complex permittivity of each sample was measured. The effect of dopants like HClO4 and HCl on these dielectric properties was also studied. The d.c. conductivity of the pressed samples measured by the two-probe method was also studied. © Indian Academy of Sciences.

Pulfrey-Taylor S.,Wirral Grammar School for Girls | Henthorn E.,Carmel College | Atkinson K.,University of Liverpool | Wyner A.,University of Liverpool | Bench-Capon T.,University of Liverpool
Frontiers in Artificial Intelligence and Applications | Year: 2011

The paper addresses the extraction, formalisation, and presentation of public policy arguments. Arguments are extracted from documents that comment on public policy proposals. Formalising the information from the arguments enables the construction of models and systematic analysis of the arguments. In addition, the arguments are represented in a form suitable for presentation in an online consultation tool. Thus, the forms in the consultation correlate with the formalisation and can be evaluated accordingly. The stages of the process are outlined with reference to a working example. © 2011 The authors and IOS Press. All rights reserved.

Vijayan Mini N.,Carmel College | Ida B.,Carmel College | Seema D.,Carmel College | Shital D.,Carmel College | And 2 more authors.
African Journal of Microbiology Research | Year: 2010

Ten herbs which are widely used in Ayurvedic system of medicine and are collectively known as "Dashapushpam "in Kerala, (India), were screened for their antimicrobial properties against nine spp. of pathogenic fungi and seven spp. of pathogenic bacteria. In the preparation of extracts, the entire shoot systems were used for Cardiospermum halicacabum and Evolvulus alsinoides and only leaves for others. Crude plant extracts were prepared by cold extraction with acetone. Two sets of pathogenic fungi-Set-1 and Set- 2-were used with Nystatin and Amphotericin as standards, respectively. From Set- 1, all the extracts showed antimicrobial properties at least with two fungal species, the most commendable being the extract of Vernonia cinerea which was effective against all the fungal strains, outscoring the standard Nystatin. Only Ipomoea sepiaria and V. cinerea could inhibit the growth of Rhodotorula sp. Among the six extracts tested with Set- 2, only I. sepiaria and V. cinerea were effective which inhibited the growth of only one strain, in sharp contrast to the activity of the standard, Amphotericin which was highly effective against all other spp. The extracts of Aerva lanata, C. halicacabum and V. cinerea inhibited the growth of six, seven and four species of bacteria respectively. Results show that the herbal extracts involved are more effective against pathogenic fungi than pathogenic bacteria and throws light on the future prospects of plants as sources of potent antibiotics. ©2010 Academic Journals.

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