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Justine Coombs, Elsa Bera
No abstract text is available yet for this article.
August 11, 2016: Blood
Orlane Patrascu, Fabienne Béguet-Crespel, Ludovica Marinelli, Emmanuelle Le Chatelier, Anne-Laure Abraham, Marion Leclerc, Christophe Klopp, Nicolas Terrapon, Bernard Henrissat, Hervé M Blottière, Joël Doré, Christel Béra-Maillet
The digestion of dietary fibers is a major function of the human intestinal microbiota. So far this function has been attributed to the microorganisms inhabiting the colon, and many studies have focused on this distal part of the gastrointestinal tract using easily accessible fecal material. However, microbial fermentations, supported by the presence of short-chain fatty acids, are suspected to occur in the upper small intestine, particularly in the ileum. Using a fosmid library from the human ileal mucosa, we screened 20,000 clones for their activities against carboxymethylcellulose and xylans chosen as models of the major plant cell wall (PCW) polysaccharides from dietary fibres...
January 16, 2017: Scientific Reports
Matthieu Roussey, Leila Ahmadi, Ségolène Pélisset, Markus Häyrinen, Arijit Bera, Ville Kontturi, Janne Laukkanen, Ismo Vartiainen, Seppo Honkanen, Markku Kuittinen
We introduce a novel concept for an optical waveguide called a strip-loaded slot waveguide. It allows an extraordinary confinement of the field in a waveguide with an extremely tiny (vertical) cross section. Unlike conventional slot waveguides, the proposed configuration has potential for very low propagation losses. Its operation is demonstrated at telecommunication wavelengths and, in addition, it is fabricated by means of mass production compatible techniques: atomic layer deposition and nanoimprint replication...
January 15, 2017: Optics Letters
Indrani Bera, Mrinal Vishwas Marathe, Pavan V Payghan, Nanda Ghoshal
Opioid agonists are used clinically for the treatment of acute and chronic pain, however, their clinical use is limited due to the presence of undesired side effects. Dual agonists, simultaneously targeting mu and kappa opioid receptors, show fewer side effects than that of selective agonists. In the present work, 2D- and 3D- Quantitative Structure Activity Relationship studies were performed on a series of aminomorphinan derivatives as dual agonists, using a wide range of descriptors. The aim of the study was to identify the structural requirements for the activity of these compounds towards mu and kappa opioid receptors and using the models, with best external predictability, for predicting the activities of new hits obtained from shape based virtual screening of drug like compounds from ZINC database...
January 10, 2017: Journal of Biomolecular Structure & Dynamics
Anirban Ghosh, Nibedita Pradhan, Swapna Bera, Aritreyee Datta, Janarthanan Krishnamoorthy, Nikhil R Jana, Anirban Bhunia
A designed non-toxic, non-hemolytic 11-residue peptide, NF11 (NAVRWSLMRPF) not only inhibits the aggregation of Amyloid beta (Aβ40) protein but also disaggregates the pre-formed oligomers and mature Aβ fibrils thereby reducing associated-toxicity. NMR experiments provide evidence of NF11's ability to inhibit fibril formation, primarily through interaction with the N-terminus region as well as the central hydrophobic cluster of Aβ40. NF11 has micro molar binding affinity towards both monomeric and aggregated species for efficient clearance of toxic aggregates...
January 6, 2017: ACS Chemical Neuroscience
Mishra Indira Sushil, J N Muneshwar, Sayeeda Afroz
INTRODUCTION: Neuropathy is one of the commonest complications of Diabetes Mellitus (DM). Apart from having peripheral and autonomic neuropathy patients with type 2 DM may also suffer from sensory neural hearing loss, which is more severe at higher frequencies. However, few studies have done detailed evaluation of sensory pathway in these patients. In this study brain stem auditory evoked potential is used to detect the acoustic and central neuropathy in a group of patients with type 2 DM with controlled and uncontrolled blood sugar...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
D Muccigrosso, N Maughan, H Schultejans, R Bera, P Parikh
PURPOSE: It is well known that lung tumors move with respiration. However, most measurements of lung tumor motion have studied long treatment times with intermittent imaging; those populations may not necessarily represent conventional LINAC patients. We summarized the correlation between tumor motion and location in a multi-institutional trial with electromagnetic tracking, and identified the patient cohort that would most benefit from respiratory gating. METHODS: Continuous electromagnetic transponder data (Varian Medical, Seattle, WA) of lung tumor motion was collected from 14 patients (214 total fractions) across 3 institutions during external beam radiation therapy in a prospective clinical trial (NCT01396551)...
June 2016: Medical Physics
Priyanath Mal, G Bera, P Rambabu, G R Turpu, Brahmananda Chakraborty, Lavanya M Ramaniah, R P Singh, Pintu Sen, Pradip Das
The influence of dopants (Co, Cu, Fe and Ni) on the optical, electronic and magnetic properties of multiferroic MnWO4 was studied using Raman spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), magnetization measurements and density functional theory (DFT) calculations. The evolution of Raman spectra with different elemental substitutions at the Mn site was also studied, where the peak width increased with doping of higher mass elements (Co, Cu, Fe and Ni). UV-Vis diffuse reflectance spectroscopy on polycrystalline Mn(1-x) A x WO4 (A  =  Co, Cu, Fe and Ni) (0  ⩽  [Formula: see text]  ⩽  0...
February 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Dixit V Bhalani, Anupam Bera, Arvind K Singh Chandel, Sweta B Kumar, Suresh K Jewrajka
Simultaneous immobilization and cross-linking of antifouling/low toxic polymers, e.g., poly(ethylenimine) (PEI), dextran (Dex), agarose (Agr), poly(ethylene glycol) (PEG), PEI-Dex, and PEI-PEG conjugates, and stimuli-responsive copolymers on a porous membrane surface in mild reaction conditions is desirable for the enhancement of hydrophilicity, antifouling character, cytocompatibility, and inducing stimuli-responsive behavior. Grafting to technique is required since the precursors of most of these macromolecules are not amenable to surface-initiated polymerization...
January 9, 2017: ACS Applied Materials & Interfaces
Achintya Bera, Anjali Singh, D Muthu, Umesh Waghmare, A Sooda
High pressure Raman spectroscopy of bulk 2H-MoTe$_2$ upto $\sim$ 29 GPa is shown to reveal two phase transitions (at $\sim$ 6 and 16.5 GPa), which are analyzed using first-principles density functional theoretical calculations. The transition at 6 GPa is marked by changes in the pressure coefficients of A$_{1g}$ and E$^{1}_{2g}$ Raman mode frequencies as well as in their relative intensity. Our calculations show that this is an isostructural semiconductor to a semimetal transition. The transition at $\sim$ 16...
December 23, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Ashok Bera, Ayon Das Mahapatra, Sulakshana Mondal, Durga Basak
Organic-inorganic hybrid diodes are very promising for solution processing, low cost, high performance optoelectronic devices. Here, we report a high quality p-n heterojunction diode composed of n-type inorganic Sb2S3 and p-type organic 2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) with a rectification ratio of ∼10(2) at an applied bias of 1 V. On illumination with visible light (470 nm, 1.82 mW/cm(2)), the current value in our device becomes 8 × 10(2) times that of its dark value even at a zero bias condition...
December 21, 2016: ACS Applied Materials & Interfaces
Sourav Sekhar Bera, Suvankar Debbarma, Avick Kumar Ghosh, Santanu Chand, Modhu Sudan Maji
Hydroarylation of internal alkynes by cost-effective Co(III)-catalysis, directed by N-tert-butyl amides, is achieved to avail mono- or dihydroarylated amide products selectively in an atom and step economic way. Several important functional groups were tolerated under the reaction conditions, and syn-hydroarylation products were exclusively isolated. Notably, a 4-fold C-H hydroarylation provided a highly conjugated organic framework in one step. Kinetic study with extensive deuterium labeling experiments were performed to support the proposed mechanism...
December 19, 2016: Journal of Organic Chemistry
Kelly G Aukema, Diego E Escalante, Meghan M Maltby, Asim K Bera, Alptekin Aksan, Lawrence P Wackett
Emerging contaminants are principally personal care products not readily removed by conventional wastewater treatment and, with an increasing reliance on water recycling, become disseminated in drinking water supplies. Carbamazepine, a widely used neuroactive pharmaceutical, increasingly escapes wastewater treatment and is found in potable water. In this study, a mechanism is proposed by which carbamazepine resists biodegradation, and a previously unknown microbial biodegradation was predicted computationally...
December 27, 2016: Environmental Science & Technology
S Supiot, G Delaroche, I Latorzeff, N Magne, G Créhange, C Carrie, P Pommier, E Martin, G Bera, E Rio, A Paumier, J Martin, M Levine, J Julian, H Lukka, C Catton
No abstract text is available yet for this article.
November 2016: Progrès en Urologie
Vladimir A Maksimenko, Vladimir V Makarov, Bidesh K Bera, Dibakar Ghosh, Syamal Kumar Dana, Mikhail V Goremyko, Nikita S Frolov, Alexey A Koronovskii, Alexander E Hramov
We study excitation and suppression of chimera states in an ensemble of nonlocally coupled oscillators arranged in a framework of multiplex network. We consider the homogeneous network (all identical oscillators) with different parametric cases and interlayer heterogeneity by introducing parameter mismatch between the layers. We show the feasibility to suppress chimera states in the multiplex network via moderate interlayer interaction between a layer exhibiting chimera state and other layers which are in a coherent or incoherent state...
November 2016: Physical Review. E
Sheetal Uppal, Amit Kumar Singh, Richa Arya, Debanjan Tewari, Neha Jaiswal, Abhijeet Kapoor, Amal Kanti Bera, Alo Nag, Suman Kundu
Since its discovery, neuroglobin (Ngb), a neuron-specific oxygen binding hemoglobin, distinct from the classical myoglobin and blood hemoglobin, has attracted attention as an endogenous neuroprotectant. Recent reports suggest that Ngb protects neurons from brain stroke, ischemic stress-induced degeneration, and other brain disorders. Proteins with a specific role in neuroprotection are often associated with neurodegeneration, as well, depending on the cellular environment or specific cellular triggers that tilt the balance one way or the other...
December 13, 2016: Biochemistry
Suvankar Debbarma, Sourav Sekhar Bera, Modhu Sudan Maji
The readily synthesized trichloro acetimidamide was found to be an excellent directing group for the directed C-H-allylation reactions. Depending on the allylating agent used, selectively either mono- or diallylated products were readily synthesized. Moreover, the trichloro acetimidamide directing group was found to be highly efficient even at lower temperature for the C-H-allylation reaction. Due to mildness of the reaction conditions, double bond isomerization or cyclization to indole side product was not observed...
December 2, 2016: Journal of Organic Chemistry
Indradweep Chakrabarty, Suleman M Inamdar, Manjur O Akram, Amol B Gade, Subhrashis Banerjee, Saibal Bera, Nitin T Patil
A Pt-catalyzed, highly regioselective reaction between N-allenamides and imino-alkynes leading to pyrrolo[1,2-a]indoles is described. This represents the first example of [3+2]-annulation of Pt-bound azomethine ylides with the distal C[double bond, length as m-dash]C bond of N-allenamides. The mechanism of the reaction was established by computational studies.
December 20, 2016: Chemical Communications: Chem Comm
M-S Agier, F Beau-Salinas, T Bejan-Angoulvant, C Lengellé, A-P Jonville-Béra
No abstract text is available yet for this article.
January 2017: Archives de Pédiatrie: Organe Officiel de la Sociéte Française de Pédiatrie
Taruna Anand, Bidhan Ch Bera, Rajesh K Vaid, Sanjay Barua, Thachamvally Riyesh, Nitin Virmani, Mubarik Hussain, Raj K Singh, Bhupendra N Tripathi
The ecosystem is continuously exposed to a wide variety of antimicrobials through waste effluents, agricultural run-offs and animal-related and anthropogenic activities, which contribute to the spread of antibiotic resistance genes (ARGs). The contamination of ecosystems with ARGs may create increased opportunities for their transfer to naive microbes and eventually lead to entry into the human food chain. Transduction is a significant mechanism of horizontal gene transfer in natural environments, which has traditionally been underestimated as compared to transformation...
December 2016: Journal of General Virology
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