Raiganj College University College

Rāiganj, India

Raiganj College University College

Rāiganj, India

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Bagchi B.,Raiganj College University College | Goswami T.,North Bengal University | Ghosh P.,North Bengal University | Bothra A.K.,Raiganj College University College
Asian Journal of Chemistry | Year: 2016

The redox potential of puupehedienone/puupehenone couple was calculated at DFT- B3LYP/6-311G(d,p) level of theory in conjugation with polarizable continuum model (PCM). The calculated value of redox potential relative to standard hydrogen electrode was -0.370 V. The influence of hydrogen-bond on the redox reaction was also investigated and it has been found that redox reaction depends mainly on interaction energy and solvation free energy. © 2016, Chemical Publishing Co. All rights reserved.


Malik K.,University of Calcutta | Das D.,University of Calcutta | Bandyopadhyay S.,University of Calcutta | Mandal P.,Saha Institute of Nuclear Physics | And 3 more authors.
Applied Physics Letters | Year: 2013

Thermal variation of structural property, linear thermal expansion coefficient (α), resistivity (ρ), thermopower (S), and power factor (PF) of polycrystalline Bi1-xSbx (x = 0.10 and 0.14) samples are reported. Temperature-dependent powder diffraction experiments indicate that samples do not undergo any structural phase transition. Rietveld refinement technique has been used to perform detailed structural analysis. Temperature dependence of α is found to be stronger for Bi 0.90Sb0.10. Also, PF for direct band gap Bi 0.90Sb0.10 is higher as compared to that for indirect band gap Bi0.86Sb0.14. Role of electron-electron and electron-phonon scattering on ρ, S, and PF has been discussed. © 2013 AIP Publishing LLC.


Chatterjee S.,Indian Association for The Cultivation of Science | Singh V.R.,Indian Association for The Cultivation of Science | Deb A.K.,Raiganj College University College | Giri S.,Indian Association for The Cultivation of Science | And 4 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2010

The magnetic properties of the cubic Heusler alloys with nominal compositions Ni2 + x Mn1 - xIn have been investigated experimentally as well as theoretically using first principles electronic structure calculations. Magnetization measurements indicate that all the alloys considered in this work have ferromagnetic ground state. The Curie temperature and the saturation moment of the samples are found to decrease systematically with increasing Ni concentration. No indication of structural transition was evident from our experimental data recorded down to 5 K. Electronic structure calculation indicates that localized magnetic moments are predominantly contributed by the Mn atoms and the calculated magnetic moment as a function of excess Ni concentration agrees well with the experimental data. © 2009 Elsevier B.V. All rights reserved.


Saha M.R.,North Bengal University | De Sarker D.,Raiganj College University College | Sen A.,North Bengal University
Indian Journal of Traditional Knowledge | Year: 2014

Present study aimed at documenting and analyzing the ethnoveterinary practices of domesticated animals and birds of Malda district of West Bengal in India. Successive field surveys were conducted to assemble data from tribal practitioners by means of semi-structured individual interviews, open ended questionnaires, informal interviews, group discussion, etc. Present study recorded 70 phytotherapeutic practices involving 60 plants which were used to treat 34 types of disease and disorders of livestock. Out of 34 livestock disease and disorders, mostly treated ailment was agalactia with 7 different therapeutic uses followed by fever, treated with 5 different preparations. Leaves were most frequently used plant parts in preparing medicinal formulations. However, five new ethnoveterinary formulations were documented during this survey for the first time. The informants' consensus factor (FIC) was found very high (0.88 - 1) establishing the study more authentic. This is the first detailed documentation of ethnoveterinary knowledge as well as first report of determining FIC among the tribal communities of this region.


Roy A.,North Bengal University | Bhattacharya S.,North Bengal University | Bothra A.K.,Raiganj College University College | Sen A.,North Bengal University
OMICS A Journal of Integrative Biology | Year: 2013

Members of the genus Mycobacterium are notorious for their pathogenesis. Investigations from various perspectives have identified the pathogenic strategies employed by these lethal pathogens. Secretomes are believed to play crucial roles in host cell recognition and cross-talks, in cellular attachment, and in triggering other functions related to host pathogen interactions. However, a proper idea of the mycobacterial secretomes and their mechanism of functionality still remains elusive. In the present study, we have developed a comprehensive database of potential mycobacterial secretomes (MycoSec) using pre-existing algorithms for secretome prediction for researchers interested in this particular field. The database provides a platform for retrieval and analysis of identified secretomes in all finished genomes of the family Mycobacteriaceae. The database contains valuable information regarding secretory signal peptides (Sec type), lipoprotein signal peptides (Lipo type), and Twin arginine (RR/KR) signal peptides (TAT type), prevalent in mycobacteria. Information pertaining to COG analysis, codon usage, and gene expression of the predicted secretomes has also been incorporated in the database. MycoSec promises to be a useful repertoire providing a plethora of information regarding mycobacterial secretomes and may well be a platform to speed global health research. MycoSec is freely accessible at http://www.bicnbu.in/mycosec. © Copyright 2013, Mary Ann Liebert, Inc. 2013.


Chatterjee A.,Raiganj College University College
International Journal of ChemTech Research | Year: 2013

Ethanol electro-oxidations on to platinum surface have been reported in surfactant environment. Analysis of the cyclicvoltammtry results shows that ethanol (EtOH) solution containing surfactants show a remarkable depression of all the peak current as compared to only ethanol solution. It is observed that in the presence of SDS (sodium dodecyl sulfate) the oxidation current of EtOH is reduced to a small extent but it is reduced to a large extent in the presence of CTAB (cetyl trimethyl ammonium bromide). Again, it is revealed from the study that both oxidation potential and the peak current are function of surfactant concentration.


Acharya S.,University of Burdwan | Sutradhar S.,University of Burdwan | Mandal J.,University of Burdwan | Mukhopadhyay K.,University of Burdwan | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2012

Nanocrystalline BiFeO 3 and rare earth ion doped BiFeO 3 (Bi 0.9R 0.1FeO 3, R=Er and Tm) were prepared by sol-gel method. Rietveld analysis of the X-ray diffractograms of the samples revealed that small amount of impurity phase of Bi 2Fe 4O 9 was formed together with the desired phase. In the thermal variation of magnetic mass susceptibility (χ m) of the samples, one sharp transition below T M (T M∼100 K, 50 K and 30 K for BiFeO 3, Bi 0.9Er 0.1FeO 3 and Bi 0.9Tm 0.1FeO 3, respectively) was observed, which clearly hint the change of the domination of the ferromagnetic exchange interaction over the usual antiferromagnetic exchange interaction. Also, static magnetization (M) and susceptibility of each doped sample have been drastically enhanced compared to that of BiFeO 3. The values of χ m and M measured at different temperatures confirmed that the magnetic behavior of the doped systems has been dominated by the paramagnetic/ferromagnetic clusters below ∼T M. Another phase transition were observed in the χ m vs. T curve of the samples at relatively higher temperature T B (∼260 K for BiFeO 3, ∼220 K for Bi 0.9Er 0.1FeO 3 and ∼180 K for Bi 0.9Tm 0.1FeO 3), which may be attributed to the charge ordering transition. Ferroelectric hysteresis loops of the samples observed at 100 Hz confirmed the presence of ferroelectric ordering of the samples. Measured values of dielectric constants at 1 kHz of each sample in presence and absence of magnetic field confirmed a substantial magnetoelectric coupling of all the samples. © 2012 Elsevier B.V. All rights reserved.


Mandal J.,University of Burdwan | Sarkar B.J.,University of Burdwan | Deb A.K.,Raiganj College University College | Chakrabarti P.K.,University of Burdwan
Journal of Magnetism and Magnetic Materials | Year: 2014

Nanocrystalline Fe3+ doped samarium oxide (Sm 1.90Fe0.10O3) has been prepared by the co-precipitation method. The as prepared sample has been annealed at 700 °C for 6 h in an argon atmosphere. The pure crystallographic phase as well as the substitution of Fe3+ ions in the lattice of Sm2O 3 is confirmed by Rietveld analysis of the X-ray diffraction patterns. The variation of magnetic susceptibility (χ) with temperature (T) is recorded by a Faraday Magnetometer in the temperature range of 300-14 K. The variation of χ vs. T down to ∼50 K was successfully fitted by the Curie-Weiss law and below this temperature, susceptibility increases very rapidly, which suggests the presence of ordering at low temperature. To explore this, magnetic measurements are also carried out at different temperatures down to 2 K by using a SQUID Magnetometer. No hysteretic behavior is observed down to 50 K, but a feeble ferromagnetic behavior is observed in the magnetization vs. field curve recorded at ∼30 K. A clear hysteresis loop is observed at 2 K with a comparatively high value of maximum magnetization (∼3.32 emu/gm). The observed magnetic phase transition is analyzed by using the dipole-dipole interaction among the magnetic nanoparticles at low temperature. © 2014 Elsevier B.V.


Sarkar B.J.,University of Burdwan | Bandyopadhyay A.,University of Burdwan | Mandal J.,University of Burdwan | Deb A.K.,Raiganj College University College | Chakrabarti P.K.,University of Burdwan
Journal of Alloys and Compounds | Year: 2016

Nanoparticles of Co-doped gadolinium oxide (Gd1.90Co0.10O3-δ) are prepared by co-precipitation method. To enhance the oxygen vacancy, the as prepared sample is sintered in vacuum at 700 °C for 6 h. The pure crystallographic phase as well as the complete substitution of Co-ions in the lattice of Gd2O3 is confirmed by Rietveld analysis of the X-ray diffraction pattern. No impurity phase is formed in the doped sample of Gd2O3 and this fact is also substantiated by the Raman Spectroscopy of the doped sample observed at room temperature. Magnetic measurements are carried out at different temperatures from 300 K down to 5 K by using a superconducting quantum interference device (SQUID) Magnetometer. The sample exhibit paramagnetic behavior down to 20 K but a feeble nonlinearity in the magnetization vs. field curve recorded at ∼20 K indicates the presence of very weak magnetic ordering in the sample. A clear hysteresis loop with high value of magnetization (∼103.56 emu/gm) is observed at 5 K with maximum applied field of 5 T. The lack of saturation in the hysteresis loop at and below ∼20 K indicates the coexistence of paramagnetic (PM) and ferromagnetic (FM) phase, which is confirmed by the good fitting of the M-T curve below ∼30 K by 3D spin wave and Curie-Weiss model. The observed magnetic phase transition is attributed to the substitution of Co-ions in Gd2O3 lattice and is analyzed by oxygen vacancy mediated bound magnetic polaron model. © 2015 Elsevier B.V. All rights reserved.


Chatterjee A.,Raiganj College University College | Bothra A.K.,Raiganj College University College
International Journal of Integrative Biology | Year: 2010

AngiotensinI (Ang I) is an oligopeptide, generated by the action of renm on alpha2-globulin or angiotensinogen. Substantiative amount of experimental and theoretical work has been done for AngiotensinH (Ang H) but much attention is not given to AngiotensitiI (Ang I) although it is precursor of Ang II. hi this work we have performed molecular dynamics simulation and principal component analysis of the peptide of Ang I in water and dimethyl sulfoxide (DMSO) using GROMACS software for a period of five nano second. On the analysis of the simulation trajectories, it is observed that the peptide behaves differently in DMSO. It is also seen that in both medium the fluctuation of N-terminal part (1-5 residue) is greater than C-terminal part (6-10 residue). We have also observed the distance between the C (alpha) of residue i and the C (alpha) of residue i+3. It is clear from the analysis that the peptide has different motional properties in two solvents and it remains in relatively folded form in water. ©IJIB All rights reserved.

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