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Now showing items 17 - 32 of 782

  • Insignia of positronium–molecular interaction in polyamide membrane material

    Dutta, D.   Bhattacharyya, A.   Chatterjee, S.   Ganguly, B.N.  

    A new variety of heterocyclic polyamide membrane material has been studied for the micro-void size and its dominant associative features through positronium annihilation method, concomitantly its molecular characterization was confirmed through FTIR spectroscopy. A nonmonotonous temperature dependence of annihilation rate constant related to configurational energy changes have been discussed through the paradigm of activated process for positronium–molecular interaction, and a plausible explanation for the corresponding inhibition of positronium formation at the low temperature has been presented.
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  • Process-based distributed modeling approach for analysis of sediment dynamics in a river basin

    Kabir, M. A.   Dutta, D.   Hironaka, S.  

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  • Nucleon resonances with double polarization observables of pion photoproduction

    Dutta, D.   Gao, H.   Lee, T.-S. H.  

    The role of the nucleon resonances in the double polarization observables of pion photoproduction is investigated by using the resonance parameters predicted by Capstick and Roberts. As an example, we show that the not-well-determined two-star resonance N(3/2)(-)(1960) can be examined by performing experiments on beam-recoil polarization at large angles.
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  • Microstructural Study of Silica Gel by Positron Annihilation

    Dutta, D.   Ganguly, B. N.   Gangopadhyay, D.   Mukherjee, T.   Dutta-Roy, B.  

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  • Information entropy of conditionally exactly solvable potentials

    Dutta, D.   Roy, P.  

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  • Dissipative phenomena in a chemically nonequilibrated quark gluon plasma

    Dutta, D.   Mohanty, A. K.   Kumar, K.   Choudhury, R. K.  

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  • Application of fuzzy goal programming approach to multi-objective linear fractional inventory model

    Dutta, D.   Kumar, Pavan  

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  • Lipid lowering after myocardial infarction in hospital practice

    Dutta, D.   Ogunnaike, B.  

    There is strong evidence for the use of HMG Co-A reductase inhibitors (statins) for secondary prevention after myocardial infarction. Previous surveys suggest sub-optimal use of such secondary prevention measures. The national service framework (NSF) for coronary heart disease (CHD) has now set new standards for preventing and treating CHD. In our audit of 182 survivors of myocardial infarction in 1999, 86.2 per cent had cholesterols measured on admission, but only 39 per cent had statins prescribed on discharge. Our data provide information about base-line practice for the year immediately preceding the publication of the NSF and indicate that the average district general hospital may have a long way to go to meet the target set by the NSF.
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  • Speeding up tandem mass spectrometry database search: metric embeddings and fast near neighbor search

    Dutta, D.   Chen, T.  

    Motivation: Due to the recent advances in technology of mass spectrometry, there has been an exponential increase in the amount of data being generated in the past few years. Database searches have not been able to keep with this data explosion. Thus, speeding up the data searches becomes increasingly important in mass-spectrometry-based applications. Traditional database search methods use one-against-all comparisons of a query spectrum against a very large number of peptides generated from in silico digestion of protein sequences in a database, to filter potential candidates from this database followed by a detailed scoring and ranking of those filtered candidates. Results: In this article, we show that we can avoid the one-against-all comparisons. The basic idea is to design a set of hash functions to pre-process peptides in the database such that for each query spectrum we can use the hash functions to find only a small subset of peptide sequences that are most likely to match the spectrum. The construction of each hash function is based on a random spectrum and the hash value of a peptide is the normalized shared peak counts score (cosine) between the random spectrum and the hypothetical spectrum of the peptide. To implement this idea, we first embed each peptide into a unit vector in a high-dimensional metric space. The random spectrum is represented by a random vector, and we use random vectors to construct a set of hash functions called locality sensitive hashing (LSH) for preprocessing. We demonstrate that our mapping is accurate. We show that our method can filter out > 95.65% of the spectra without missing any correct sequences, or gain 111 times speedup by filtering out 99.64% of spectra while missing at most 0.19% (2 out of 1014) of the correct sequences. In addition, we show that our method can be effectively used for other mass spectra mining applications such as finding clusters of spectra efficiently and accurately. Contact: tingchen@usc.edu Supplementary information: Supplementary data are available at Bioinformatics online.
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  • Transcription Termination Factor Rho Prefers Catalytically Active Elongation Complexes for Releasing RNA

    Dutta, D.   Chalissery, J.   Sen, R.  

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  • Nitrogen-fixing and cellulose-producing Gluconacetobacter kombuchae sp. nov., isolated from Kombucha tea

    Dutta, D.   Gachhui, R.  

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  • Q weak : First Direct Measurement of the Proton’s Weak Charge

    Androic, D.   Armstrong, D.S.   Asaturyan, A.   Averett, T.   Balewski, J.   Bartlett, K.   Beaufait, J.   Beminiwattha, R.S.   Benesch, J.   Benmokhtar, F.   Birchall, J.   Carlini, R.D.   Cates, G.D.   Cornejo, J.C.   Covrig, S.   Dalton, M.M.   Davis, C.A.   Deconinck, W.   Diefenbach, J.   Dowd, J.F.   Dunne, J.A.   Dutta, D.   Duvall, W.S.   Elaasar, M.   Falk, W.R.   Finn, J.M.   Forest, T.   Gal, C.   Gaskell, D.   Gericke, M.T.W.   Grames, J.   Gray, V.M.   Grimm, K.   Guo, F.   Hoskins, J.R.   Johnston, K.   Jones, D.   Jones, M.   Jones, R.   Kargiantoulakis, M.   King, P.M.   Korkmaz, E.   Kowalski, S.   Leacock, J.   Leckey, J.   Lee, A.R.   Lee, J.H.   Lee, L.   MacEwan, S.   Mack, D.   Magee, J.A.   Mahurin, R.   Mammei, J.   Martin, J.W.   McHugh, M.J.   Meekins, D.   Mei, J.   Michaels, R.   Micherdzinska, A.   Mkrtchyan, A.   Mkrtchyan, H.   Morgan, N.   Myers, K.E.   Narayan, A.   Ndukum, L.Z.   Nelyubin, V.   Nuhait, H.   Nuruzzaman,   van Oers, W.T.H   Opper, A.K.   Page, S.A.   Pan, J.   Paschke, K.D.   Phillips, S.K.   Pitt, M.L.   Poelker, M.   Rajotte, J.F.   Ramsay, W.D.   Roche, J.   Sawatzky, B.   Seva, T.   Shabestari, M.H.   Silwal, R.   Simicevic, N.   Smith, G.R.   Solvignon, P.   Spayde, D.T.   Subedi, A.   Subedi, R.   Suleiman, R.   Tadevosyan, V.   Tobias, W.A.   Tvaskis, V.   Waidyawansa, B.   Wang, P.   Wells, S.P.   Wood, S.A.   Yang, S.   Young, R.D.   Zang, P.   Zhamkochyan, S.   Foka, Y.   Brambilla, N.   Kovalenko, V.  

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  • Intrabronchial injection, an unusual complication of interpleural analgesia

    DUTTA, D.   HARDY, P. A. J.  

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  • Contribution of Impaired Mitochondrial Autophagy to Cardiac Aging: Mechanisms and Therapeutic Opportunities

    Dutta, D.   Calvani, R.   Bernabei, R.   Leeuwenburgh, C.   Marzetti, E.  

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  • Generalized counting rule and oscillatory scaling

    Dutta, D.   Gao, H.  

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  • Effect of Confinement on the Phase Transition of Benzene in Nanoporous Silica: A Positron Annihilation Study

    Dutta, D.   Pujari, P. K.   Sudarshan, K.   Sharma, S. K.  

    We report new results on the solid-liquid phase transition of benzene confined in nanopores of silica using positron annihilation spectroscopy. The pore sizes, ranging from 0.7 to 7.0 nm, were evaluated by positron lifetime and the Brunauer-Emmett-Teller (BET) techniques. Temperature dependent Doppler and lifetime measurements revealed discontinuities at temperatures below the bulk freezing temperature of benzene corresponding to the freezing of benzene confined in pores of different dimensions present in the silica samples. The temperatures corresponding to the freezing of confined liquids were assigned to the pore sizes on the basis of the well-known inverse correlation of depression in the freezing point with pore sizes. However, the magnitude of shift in the freezing point could not be explained on the basis of the classical Gibbs-Thomson relation. On the other hand, the data are seen to be consistent with the molecular cluster theory for microcrystal growth in confined region.
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