Trichūr, India
Trichūr, India

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Rajkumar P.R.,Bharathiyar University | Subhashchandran K.P.,Sri Vyasa NSS college
Digest Journal of Nanomaterials and Biostructures | Year: 2017

Nano filler dispersed conjugated polymer composites have zooming significance on account of their synergistic and hybrid attributes attained from the extensive gamut of modules. Pure and 2.5 mole % TiO2 nanoparticle dispersed PVAxPOM(1-x) polymer composite films for various x values (x= 0 to 1 insteps of 0.25) were casted by means of simple solution casting technique (SSCT). The casted films were characterized by structurally by X-ray diffraction method. Optical behaviour of the pure and TiO2 dispersed films were tested using UV-Vis absorbance spectroscopy. The dielectric measurements were performed using an impedance analyzer (Agilent 4284 A LCR meter) covering a frequency range from 100 to 1×106 Hz. © 2017, Inst Materials Physics. All rights reserved.


Suseel Rahul K.,Sri Vyasa Nss College | Suseel Rahul K.,Central University of Kerala | Salini K.,Central University of Kerala | Mathew V.,Central University of Kerala
Journal of Physics Condensed Matter | Year: 2016

In this study, we have carried out a detailed theoretical investigation on the binding energy of an exciton in type-II CdTe/CdSe core/shell/well/shell (CSWS) nanocrystal quantum dot (NCQD) in the strong confinement region. The calculations are based on the effective mass approximation, and the coulombic interaction between electron and hole is introduced using Hartree approximation. With these theoretical basis, the coupled Poisson-Schrodinger equations are solved in a self consistent iterative manner. In strong confinement regime, the binding energy variation with core radius in type-II NCQD shows a peak. And this peak widens for larger well width and inner shell thickness. Our study suggests that, this anomalous behavior of exciton binding energy is due to an effect called 'positional flip of exciton', caused by the faster tunneling of hole to the inner layer in comparison with electron. Our results can be applied in laser and optoelectronic engineering for designing more efficient optoelectronic devices. © 2016 IOP Publishing Ltd.


Selvam R.,Bharathiar University | Subashchandran K.P.,Sri Vyasa NSS College
International Journal of Peptide Research and Therapeutics | Year: 2014

Synthesis of hydrophobic peptides remains difficult due to internal aggregation of constituent amino acids via β-sheet formation, and also due to the association between the protected chains with the synthetic-support matrix. There are two types of amino acids: hydrophilic and hydrophobic. Each amino acid is chemically different, so the coupling efficiency of hydrophobic and hydrophilic amino acids also differs from each other. If large numbers of hydrophobic amino acids are present in a peptide sequence despite these difficult to synthesis. Here we developed a novel PS-TPGDD resin as a solid support for the synthesis of hydrophobic peptide, which is still a challenge to peptide chemistry. The most essential biologically active hydrophobic peptide T-1-Conotoxin (IINWCCLIFYQCC) was successfully synthesized and some synthetic modification was performed using the Fmoc SPPS method. Graphical Abstract [Figure not available: see fulltext.] © 2014 Springer Science+Business Media New York.


Omalsree M.,Bharathiar University | Omalsree M.,Sri Vyasa Nss College | Prabhu Kumar K.M.,Center for Medicinal Plants Research | Sabu M.,Calicut UniversityKerala | And 4 more authors.
Phytotaxa | Year: 2015

A new species of Striga from Tamil Nadu parts of Western Ghats of India is described and illustrated as Striga kamalii sp. nov. The new species shows similarity with S. densiflora in having a densely hispid stem, linear leaves, bracts longer than calyx, and oblong fruit shorter than calyx lobes, but differs in the 10-ribbed calyx, the glandular hairs on calyx and corolla tube, and the obovate-rounded petals. A detailed description, with data on distribution and parasitism together with relevant taxonomic notes and colour photographs are provided. © 2015 Magnolia Press.


Selvam R.,Bharathiar University | Sudha E.,Jawaharlal Nehru Technological University | Rajkumar P.R.,Bharathiar University | Subashchandran K.P.,Sri Vyasa NSS College
Journal of Chemical Biology | Year: 2015

The 10 amino acid sequence of the biologically important neutral amylo-β peptide has equally hydrophilic and hydrophobic properties, which reduces the coupling efficiency during its synthesis and reduces the final yield of the peptide, and is therefore classified as a “difficult peptide sequence.” The method presented here minimizes the synthetic problems by the introduction of improved Fmoc chemistry and effective hydroxybenzotriazole (HoBt), diisopropylcarbodiimide (DIC)-coupling and activation strategies. In addition, we developed a PS-TPGD resin as a solid support for the synthesis of specific neutral peptides, which is still a challenge to peptide chemistry. The most essential biologically active neutral amylo-β peptide (KVKRIILARS) was successfully synthesized, and some synthetic modification was performed using the Fmoc solid-phase peptide synthesis (SPPS) method for purity and yield improvement. [Figure not available: see fulltext.] © 2015, Springer-Verlag Berlin Heidelberg.


Selvam R.,Bharathiar University | Rohini K.C.,Sri Vyasa NSS College | Arunan C.,Mahatma Gandhi University | Subashchandran K.P.,Sri Vyasa NSS College
Asian Journal of Chemistry | Year: 2013

In peptide chemistry, there is the goal to produce pure biologically active peptides with the highest possible efficiency, even its possible by chemical synthesis purity and yield as a major problem. In this work, we focus to overcome above difficulty by novel synthetic approach. Angiotensin an oligopeptide is a hormone and a powerful dipsogen, which exhibits a wide range of biological activities, the 8-amino acid sequence Angiotensin-II and 6-amino acid sequence. Angiotensin-IV were synthesized by using 4-(2',4'- dimethoxyphenyl- Fmoc-aminomethyl)phenoxy resin, the modified Fmoc-chemistry and effective hydroxybenzenetriazole, N,N'-diisopropylcarbodiimide coupling and activation methods was used. The yield and chromatographic purities were compared.


PubMed | Jawaharlal Nehru Technological University, Bharathiar University and Sri Vyasa NSS College
Type: Journal Article | Journal: Journal of chemical biology | Year: 2015

The 10 amino acid sequence of the biologically important neutral amylo- peptide has equally hydrophilic and hydrophobic properties, which reduces the coupling efficiency during its synthesis and reduces the final yield of the peptide, and is therefore classified as a difficult peptide sequence. The method presented here minimizes the synthetic problems by the introduction of improved Fmoc chemistry and effective hydroxybenzotriazole (HoBt), diisopropylcarbodiimide (DIC)-coupling and activation strategies. In addition, we developed a PS-TPGD resin as a solid support for the synthesis of specific neutral peptides, which is still a challenge to peptide chemistry. The most essential biologically active neutral amylo- peptide (KVKRIILARS) was successfully synthesized, and some synthetic modification was performed using the Fmoc solid-phase peptide synthesis (SPPS) method for purity and yield improvement. Graphical abstract.

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