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Kailāshahar, India

De U.C.,Tripura University | Ghosh R.,Sarat Chandra H.S. School | Chowdhury S.,RK Mahavidyalaya | Dinda B.,Tripura University
Natural Product Communications | Year: 2012

A new iridoid, shanzhiol (1), was isolated from the aerial parts of Mussaenda roxburghii. The structure was established by spectroscopic (including 2D NMR) and chemical methods. Shanzhiol (1) showed mild antibacterial activity against both Staphylococcus aureus and Escherichia coli with a MIC of 100 μg/mL by the broth dilution method.


Debbarma A.,RK Mahavidyalaya
Communications in Computer and Information Science | Year: 2012

Vowels form the basic block for word formation. It is the main constituent block for word pronunciation. In this paper we try to analyze the Kokborok vowels signals. Kokborok is the official language of Tripura, India. A Linear predictive coding coefficient (LPCC) feature is extracted and analyzed to recognize the vowels. Kokborok uses the English vowels format with additional vowel 'w'. We have found satisfactory recognition rate for the Kokborok vowels based on LPC analysis. © 2012 Springer-Verlag.


Singh M.K.,Tripura University | Sutradhar S.,Tripura University | Paul B.,Tripura University | Adhikari S.,Government Degree College | And 3 more authors.
Journal of Coordination Chemistry | Year: 2015

(Figure Presented) A new luminescent complex of Cd(II) with 1,1-dicyanoethylene-2,2-dithiolate [i-MNT2- = {S2C:C(CN)2}2-] has been synthesized and characterized on the basis of spectroscopy and single-crystal X-ray diffraction analysis. Single-crystal X-ray diffraction analysis reveals that the cadmium(II) complex is five coordinate in a 1-D polymer. Biological screening in vitro of the complex has been tested against five fungi Synchytrium endobioticum, Pyricularia oryzae, Helminthosporium oryzae, Candida albicans (ATCC10231), and Trichophyton mentagrophytes by the disk diffusion method. The antifungal activity of the complex of Cd(II) is significant compared to K2iMNT on S. endobioticum, P. oryzae, H. oryzae, and T. mentagrophytes and proved to be crucial for the growth-inhibitor effect. A new luminescent complex of Cd(II) with 1,1-dicyanoethylene-2,2-dithiolate [i-MNT2- = {S2C: C(CN)2}2-] with 1,3-diaminopropane (tn) and 4-methyl pyridine (γ-picoline) as secondary ligands has been synthesized and characterized on the basis of spectroscopy and single-crystal X-ray diffraction analysis. Single-crystal X-ray diffraction analysis reveals that cadmium(II) is five coordinate in a 1-D polymer. Biological screening effects in vitro of the synthesized complex has been tested against five fungi Synchytrium endobioticum, Pyricularia oryzae, Helminthosporium oryzae, Candida albicans (ATCC10231), and Trichophyton mentagrophytes by the disk diffusion method. A comparative study of inhibition zone values of K2i-MNT·H2O and {[Cd(tn)(iMNT)(4-MePy)]·4H2O}n (1) indicates that the complex exhibits antifungal activity, whereas K2i-MNT·H2O became silent on S. endobioticum, P. oryzae, H. oryzae, C. albicans (ATCC10231), and T. mentagrophytes. © 2015 Taylor & Francis.


Singh M.K.,Tripura University | Sutradhar S.,Tripura University | Paul B.,Tripura University | Adhikari S.,Government Degree College | And 3 more authors.
Journal of Coordination Chemistry | Year: 2014

A new mixed ligand complex of Zn(II) with 1,1-dicyanoethylene-2,2-dithiolate [i-MNT2- = {S2C:C(CN)2}2-] and 1,3-diaminopropane as ligands has been synthesized and characterized on the basis of spectroscopy and single-crystal X-ray diffraction analysis. Spectroscopic studies and single-crystal X-ray diffraction analysis reveal that the zinc(II) complex is tetrahedral and adopts a 1,3-diaminopropane-assisted linear polymeric assembly. The molar conductance data of the complex in DMF solution show non-electrolytic nature. Biological screening effects of the complex in vitro have been tested against five fungi Synchitrium endobioticum, Pyricularia oryzae, Helminthosporium oryzae, Candida albicans (ATCC10231), and Trichophyton mentagrophytes by the disk diffusion method. A comparative study of inhibition zone values of the primary ligand K2i-MNT·H2O and its synthesized complex indicates that the complex exhibits a fungistatic antifungal activity whereas K2i-MNT·H2O does not affect P. oryzae. © 2014 © 2014 Taylor & Francis.


Singh M.K.,Tripura University | Sutradhar S.,Tripura University | Paul B.,Tripura University | Adhikari S.,Government Degree College | And 3 more authors.
Journal of Coordination Chemistry | Year: 2016

A mixed-ligand polymeric metal complex of Cd(II) has been prepared by reactions of Cd(NO3)2·4H2O with 1,3-diaminopropane (tn) and potassium salt of 1,1-dicyanoethylene-2,2-dithiolate and characterized on the basis of spectroscopy and single-crystal X-ray diffraction analysis. Single-crystal X-ray diffraction analysis reveals that the Cd(II) complex crystallizes in monoclinic space group P21n with distorted octahedral coordination geometry. The Cd(II) complex was screened in vitro against fungal pathogens such as Synchytrium endobioticum, Pyricularia oryzae, Helminthosporium oryzae, Candida albicans (ATCC10231), and Trichophyton mentagrophytes by the disk diffusion method. The biological testing data of the primary ligand K2i-MNT·H2O and [Cd(tn)(i-MNT)] n indicate that the complex exhibits fungistatic antifungal activity, whereas K2i-MNT·H2O has no activity. The fungicidal properties of [Cd(tn)(i-MNT)] n showed that the cadmium complex was more bioactive than the parent ligand. © 2015 © 2015 Taylor & Francis.

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