Taleigao, India
Taleigao, India

Goa University was established under the Goa University Act of 1984 and commenced operations on 1 June 1985. The university provides higher education in the Indian state of Goa.After the annexation of Goa by India in December 1961, the University of Bombay, offered affiliation through its Centre of Post-Graduate Instruction and Research to the first colleges that were instituted in Goa in June 1962. Since 1985 Goa University offers graduate and post-graduate studies and research programmes. It is currently accredited to the NAAC in India with a rating of four stars. It is located on the Taleigao Plateau. Wikipedia.


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Parvatkar P.T.,National Institute of Oceanography of India | Parameswaran P.S.,National Institute of Oceanography of India | Tilve S.G.,Goa University
Chemistry - A European Journal | Year: 2012

Heterocyclic scaffolds represent the key structural subunits of many biologically active compounds. Over the last few years iodine-mediated reactions have been extensively studied due to their low cost and eco-friendliness. This Review covers advances in the field of iodine-mediated synthesis of heterocyclic compounds since 2006, especially with an emphasis on mechanisms of ring formation. In this article, syntheses of different heterocycles are classified based on the manipulation of functional groups. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


The present article describes the synthesis of a wide spectrum of natural products of the class pyrrolidines, pyrrolizidines and indolizidines using proline as a viable synthetic precursor. The review emphasizes the versatility of the basic unit of proline as a useful chiral synthon confined for the synthesis of only natural products of the above mentioned families. The vast coverage of the synthesis of these natural products is presented for a period from 1990 onwards. The synthesis of all ranges of alkaloids from simple to complex molecules is presented under the groups of alkaloids. © 2014 The Royal Society of Chemistry.


Srinivasan B.R.,Goa University
Journal of Luminescence | Year: 2014

The reactive nature of aqueous orthophosphoric acid (H3PO 4) towards l-arginine (l-Arg), to form a phosphate salt namely l-arginine phosphate monohydrate (LAP), rules out the doping of any l-arginine into H3PO4. Hence, the reported claim of growth of 'l-arginine doped orthophosphoric acid' crystals by Saradha et al. J. Lumin (2013) is untenable. © 2013 Elsevier B.V.


Srinivasan B.R.,Goa University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

(Figure Presented) The bivalent metals Cd(II) and Zn(II) exhibit different stereochemical requirements for the set of chloride and L-proline ligands, which precludes the doping of Zn(II) ions into the crystal structure of dichloro (L-proline)cadmium(II) hydrate also referred to as L-proline cadmium chloride monohydrate (L-PCCM). Hence, the reported claim of growth of zinc doped L-PCCM crystals namely Zn(0.4mol):LPCCM and Zn(0.2mol):LPCCM by Vetrivel et al. (S. Vetrivel, P. Anandan, K. Kanagasabapathy, S. Bhattacharya, S. Gopinath, R. Rajasekaran, Effect of zinc chloride on the growth and characterization of L-proline cadmium chloride monohydrate semiorganic NLO single crystals, Spectrochim. Acta 110A (2013) 317-323), is untenable. © 2013 Elsevier B.V. All rights reserved.


Srinivasan B.R.,Goa University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

(Equation Presented) It is argued that the recently reported nonlinear optical crystal L-alanine cadmium bromide, grown by slow solvent evaporation method at room temperature [P. Ilayabarathi, J. Chandrasekaran, Spectrochim. Acta 96A (2012) 684-689] is the well-known L-alanine crystal. The isolation of L-alanine crystal is explained due to fractional crystallization. © 2013 Elsevier B.V. All rights reserved.


Srinivasan B.R.,Goa University
Optik | Year: 2014

It is argued that the nonlinear optical single crystal 'l-asparagine cadmium chloride monohydrate' grown by the slow evaporation solution growth technique by Masilamani et al. (Optik, 123 (2012) 1304-1306) is actually the well-known l-asparagine monohydrate crystal. © 2014 Elsevier GmbH. All rights reserved.


Srinivasan B.R.,Goa University
Optik | Year: 2014

It is proved that a so called novel nonlinear optical glycine barium nitrate potassium nitrate single crystal grown by slow evaporation solution growth technique by Ravishankar et al. (Optik, 2013) is actually the well-known γ-glycine crystal. © 2014 Elsevier GmbH. All rights reserved.


Pseudomonas nitroreducens TSB.MJ10 exhibiting growth and bioemulsifier production with 0.5% sodium benzoate as the sole carbon source was isolated from a mangrove ecosystem in the vicinity of a petroleum pump. The bioemulsifier is a lipopeptide that is stable over a pH range of 5-11 and a temperature range of 20-90 °C and showed emulsifying activity in the presence of relatively high NaCl concentrations (up to 25%). The bioemulsifier formed stable emulsions with aliphatic (hexadecane, n-heptane, cyclohexane), aromatic (xylene, benzene, toluene) and petroleum (gasoline, diesel, kerosene, crude oil) compounds. It exhibited a maximum emulsification activity with weathered crude oil (97%) and was capable of transforming the rheological behavior of the pseudoplastic to a Newtonian fluid. The results reveal the potential of the bioemulsifier for use in bioremediation of hydrocarbons in marine environments and in enhanced oil recovery. © 2012 Elsevier Ltd.


Srinivasan B.R.,Goa University
Journal of Thermal Analysis and Calorimetry | Year: 2015

Gopinath et al. report to have grown single crystals of thiourea urea magnesium chloride (1) (J Therm Anal Calorim 2012, 109:841-5) and urea thiourea sodium chloride (2) (J Therm Anal Calorim 2012, 110:789-92) from an aqueous solution containing thiourea, urea and magnesium chloride (sodium chloride for 2) by the slow evaporation method. In this letter, it is proved that (1) and (2) are not new metal-thiourea compounds but pure thiourea. In view of no chemical reaction among the reagents employed for crystal growth, thiourea is formed due to fractional crystallization. © 2014 Akadémiai Kiadó, Budapest, Hungary.


Naik S.R.,Goa University | Salker A.V.,Goa University
Journal of Materials Chemistry | Year: 2012

The superparamagnetic properties of the doped cobalt ferrite nanocrystals have been demonstrated. The significance of the sol-gel autocombustion method in yielding the as obtained doped cobalt ferrite oxide powder in the nano-range has been very well complemented with structural, dimensional and morphological analytical techniques such as X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), particle size analysis and Scanning Electron Microscopy (SEM). The lattice strain and lattice parameters have been calculated by making use of the Williamson-Hall extrapolation. The valence states of the metal ions and single phase formation of the polycrystalline oxides have been confirmed with the help of X-ray Photoelectron Spectroscopy (XPS) and Raman Spectroscopy. The magnetic measurements M-H and M-T have been carried out demonstrating a change in the magnetic moment and a superparamagnetic-ferrimagnetic transition in the ferrite system. The influence of the distribution of the metal ions in the crystal lattice and the dimensions of the ferrite oxides on the resultant magnetic properties has been demonstrated. The contribution of the spin-orbit coupling generating from the Co 2+ ions in the octahedral lattice towards higher magnetic anisotropy and hence the magnetic properties is investigated. The results provide an insight into the inter-relationship of the particle dimension, the spin-orbit coupling and the resulting superparamagnetic property. © 2012 The Royal Society of Chemistry.

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