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Mayāng Imphāl, India

Chandra Singh M.,Imphal College | Kushwaha R.A.S.,Manipur University | Srivastava G.,University of Lucknow | Mehrotra R.C.,University of Lucknow
Journal of the Geological Society of India | Year: 2012

Some plant remains are described from the Laisong Formation (Barail Group) of Thoubal and Senapati districts of Manipur. The flora is diverse comprising gymnospermous, monocotyledonous and dicotyledonous forms and indicates tropical to subtropical climate in the vicinity of the area during the deposition of the host rocks.

Agrawal H.,Banasthali University | Singh L.I.,Imphal College | Saraswat P.K.,P.A. College | Saraswat V.K.,Banasthali University
AIP Conference Proceedings | Year: 2013

In the present paper, I-V characteristics and DC volume conductivity of Se-In-Sb semi-conducting glasses has been discussed. This is an effort towards the understanding of physics of temperature dependence of dc electrical volume conductivity of Se90In10-xSbx(X=2,4,6&8) glass in bulk form. These Chalcogenide glasses were prepared by melt quenching (rapid cooling of melt) technique. The amorphous nature of as prepared glass was confirmed by XRD. Using Keithley Electrometer / High resistance Meter 6517 A, the I-V characteristics of these glasses have been recorded in a temperature range from room to 100°C and the voltage range was taken from 10V to 150V for elevated temperatures. Variation in conductivity, derived from I-V curves, as a function of composition of samples is explained on the basis of bonds formed in the system. Additionally, the Poole-Frenkel conduction mechanism has also been verified. © 2013 AIP Publishing LLC.

Lonibala R.K.,Manipur University | Devi T.H.P.,Manipur University | Yumnam S.,Manipur University | Devi R.K.B.,Manipur University | Devi R.K.B.,Imphal College
Asian Journal of Chemistry | Year: 2010

Some bivalent transition metal complexes of 3-hydroxypicolinamide (LH) of the empirical formulae, [M(LH) 2Cl(H 2O)]Cl [M = Mn, Co, Ni, Cd], [Cu(LH) 2Cl(OH)], [Hg(LH) 2Cl 2] and [M(L) 2(H 2O)n] [M = Mn, Co, Ni, Cu, Cd, Hg] have been synthesized. 1H NMR studies suggested the presence of one dissociable proton in the ligand. IR and NMR data show that LH acts as a neutral N,O chelating ligand in the protonated form while it behaves as a uninegative O, O chelating species in the monodeprotonated form. Electronic spectral studies suggest distorted octahedral geometry for Mn(II), Co(II), Ni(II) and Cu(II) complexes. Isotropic nature of Mn(II) complexes and anisotropic nature of Cu(II) complexes at LNT have been inferred from the ESR studies. Appreciable covalent nature of bonding in the complexes is suggested by the bonding parameters obtained from electronic and ESR spectra. 113Cd chemical shift also shows that Cd(II) ion is covalently bonded in [Cd(LH) 2Cl(H 2O)]Cl. XRD powder patterns of the Cu(II) complexes are indexed for a tetragonal crystal system for [Cu(LH) 2Cl(OH)] and orthorhombic for [Cu(L) 2(H 2O) 2]. Tentative structures of these complexes have been suggested based on their elemental, thermal, molar conductance, magnetic moment, and spectral data.

Singh M.A.,Manipur University | Singh M.A.,Imphal College | Chandrasekaran S.,Manipur University | Chandrasekaran S.,Tamil Nadu Agricultural University | And 6 more authors.
Asian Journal of Chemistry | Year: 2010

Twenty samples of brinjals (1 kg each) are collected from different vegetable markets of Imphal, India at fortnightly interval to assess the extent of pesticide residues. The samples were analyzed using multiresidues methodology (MRM) and residues were estimated by GLC for the presence of organochlorine, organophosphorus and synthetic pyrethroid insecticides. The study reveals that the maximum residue levels was observed for phorate, dimethoate, chloropyriphos, triazophos, β-endosulfan, λ-cyhalothrin and cypermethrin were 0.01, 0.19, 0.12, 0.23, 0.08, 0.12 and 0.13, respectively. None of the samples exceeded their respective maximum residues limit.

Singh S.J.,Manipur University | Singh L.R.,Manipur University | Devi S.K.,Manipur University | Singh S.S.,Manipur University | And 2 more authors.
Protein and Peptide Letters | Year: 2015

A new thermostable caseinolytic serine protease was purified from the latex of Euphorbia heterophylla L. to electrophoretic homogeneity by a procedure involving successive steps of pretreatment of the latex, PEG fractionation, CM-cellulose chromatography and DEAE-cellulose chromatography. The purified protease was found to be a monomeric protein of molecular weight 77.2 kDa. It exhibited caseinolytic activity with hyperbolic azocasein saturation with Vmax and Km values of 0.11 units.mL-1 and 0.55 mg.mL-1 respectively. Specific inhibitory studies revealed the enzyme to be a serine protease. The protease was characterized by pH optimum of 8.0 and high thermostability with T1/2 of 75°C. Based on the results of peptide mass fingerprinting analysis, the protease was shown to be a new protein not characterized earlier. © 2015 Bentham Science Publishers.

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