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Akila A.,Government Arts College Autonomous | Ponnuswamy S.,Government Arts College Autonomous | Shreevidhyaa Suressh V.,Anna Adarsh College for Women | Usha G.,Queen Marys College
Journal of Molecular Structure

Abstract Four new N-acyl-2,4-bis(4-methoxyphenyl)-3-azabicyclo[3.3.1]nonanes 3-6 have been synthesized. The structural characterization and the conformational preferences of the compounds 3-6 have been carried out using IR, 1D and 2D NMR and Mass spectral data. The NMR spectral data indicates that the N-acyl-2,4-bis(4-methoxyphenyl)-3-azabicyclo[3.3.1]nonanes 3-6 prefer to exist in twin-chair conformation with partial flattening at nitrogen end. To avoid A1,3-strain, the anisyl groups at C2 and C4 are forced to occupy the quasi-axial orientation. X-ray crystal structure of the N-dichloroacetyl-2,4-bis(4-methoxyphenyl)-3-azabicyclo[3.3.1]nonane 6 also supports the similar conformation in the solid state. © 2015 Elsevier B.V. All rights reserved. Source

Ponnuswamy S.,P.A. College | Akila A.,P.A. College | Rajakumari D.D.,P.A. College | Suressh V.S.,Anna Adarsh College for Women | Usha G.,P.A. College
Journal of Chemical Sciences

Three 1,5-benzodiazepines viz., N 5-chloroacetyl-, N 5-piperazinoacetyl- and N 5-morpholinoacetyl-2,2,4-trimethyl-1H-1,5-benzodiazepines have been synthesized. The structural characterisation and the conformational preferences of the compounds have been carried out using IR, 1D and 2D NMR spectral data. The NMR spectral data show that the N-acetyltetrahydro-1,5-benzodiazepines prefer to exist in boat conformation with exo orientation of >C=O at N 5 position in the solution state. The X-ray crystal structure of N 5-morpholinoacetyl-2,2,4-trimethyl-1H-1,5-benzodiazepine also supports boat conformation in the solid state. The antimicrobial activity for N-acetyltetrahydro-1,5-benzodiazepines have been carried out. N-morpholinoacetyl-2,2,4-trimethyl-1H-1,5-benzodiazepine demonstrated better antibacterial and antifungal activities. © 2015 Indian Academy of Sciences. Source

Shanthi P.,Anna Adarsh College for Women | Kothai S.,Ethiraj College for Women
International Journal of ChemTech Research

In this study chitosan with incorporated herb bio nanocomposite was synthesized using multiple emulsion –solvent evoparation method. Mahavilvam (narangicrenulata) was selected based on its anti-bacterial activity. The synthesized bio nanocomposite was characterized by UV, FTIR and SEM studies. Anti-Bacterial study was done using well diffusion method. A comparative anti-bacterial study was carried out for chitosan ,mahavilvam, chitosan-mahavilvam composite and chitosan-mahavilvam nanocomposite .The mahavilvam nanocomposite showed an enhanced anti-microbial activity .The SEM analysis showed that nano composite was spherical in shape, the size of composite particle was in the range of 80-94nm. © 2015, Sphinx Knowledge House. All rights reserved. Source

Samuel M.J.,Anna Adarsh College for Women | Daret V.R.,Madras Christian College
Proceedings 2010 IEEE 5th International Conference on Bio-Inspired Computing: Theories and Applications, BIC-TA 2010

Watson-Crick finite automata are language recognizing devices similar to finite automata introduced in DNA computing area. We define Watson-Crick online tessellation automata which works on double-stranded arrays where the two strands relate to each other through a complementary relation inspired by the DNA complementarity. Some computational power of this automaton is dealt with. Also we define timed Watson-Crick ω-automaton and some equivalence results have been established. © 2010 IEEE. Source

Samuel M.J.,Anna Adarsh College for Women | Dare V.R.,Madras Christian College | Kalyani T.,St. Josephs College
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

We observe that two-dimensional array languages are useful in Image Processing and Analysis. We represent two-dimensional iso-picture languages in terms of various classes of polyoisominoes. Polyoisominoes are related to tiling. The art of tiling has played an important role in the field of architecture since early civilization. A parallel generating model called pasting system was proposed in order to form coloured patterns over square grid (1999). This model allows two cells (tiles) to get glued on their sides depending upon some rules. Two tiles are called adjacent if they have an edge in common. We prove that various classes of polyoisominoes defined are tiling recognizable languages and local language. Local languages are introduced by Giammarresi and Restivo (1997). © 2010 Springer-Verlag. Source

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