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Hrishikesh Bhunia, Abhijit Bera, Amlan J Pal
We form junctions between two single layers of p-type WSe2 and n-type MoS2 in both sequences. The WSe2|MoS2 and MoS2|WSe2 junctions of ultimate thickness limit exhibit current rectification when characterized vertically with a scanning tunneling microscope (STM) tip. The direction of rectification in the pn-junction is opposite to that of the np-junction confirming occurrence of the rectification to be due to the junctions themselves. From scanning tunneling spectroscopy (STS) and correspondingly the density of states (DOS), we locate the conduction and valence band-edges (CB and VB, respectively) of the materials inferring their single-layer and 2H phase configuration...
February 13, 2017: ACS Applied Materials & Interfaces
Pabitra Saha, Swagata Ganguly, Moytrey Chatterjee, Soumendu Bikash Das, Pratip K Kundu, Subhasish K Guha, Tamal K Ghosh, Dilip K Bera, Nandita Basu, Ardhendu K Maji
Asymptomatic leishmaniasis may drive the epidemic and an important challenge to reach the goal of joint Visceral Leishmaniasis (VL) elimination initiative taken by three Asian countries. The role of these asymptomatic carriers in disease transmission, prognosis at individual level and rate of transformation to symptomatic VL/Post Kala-azar Dermal Leishmaniasis (PKDL) needs to be evaluated. Asymptomatic cases were diagnosed by active mass survey in eight tribal villages by detecting antileishmanial antibody using rK39 based rapid diagnostic kits and followed up for three years to observe the pattern of sero-conversion and disease transformation...
February 10, 2017: PLoS Neglected Tropical Diseases
Krishan K Pandey, Sibes Bera, Ke Shi, Hideki Aihara, Duane P Grandgenett
The retrovirus integrase (IN) inserts the viral cDNA into the host DNA genome. Atomic structures of five different retrovirus INs complexed with their respective viral DNA or branched viral/target DNA substrates have indicated these intasomes are composed of IN subunits ranging from tetramers, to octamers or to hexadecamers. IN precursors are monomers, dimers or tetramers in solution. But, how intasome assembly is controlled remains unclear. Therefore, we sought to unravel the functional mechanisms in different intasomes...
February 8, 2017: Journal of Biological Chemistry
Baran Sarac, Supriya Bera, Sascha Balakin, Mihai Stoica, Mariana Calin, Jürgen Eckert
In order to establish a strong cell-material interaction, the surface topography of the implant material plays an important role. This contribution aims to analyze the formation kinetics of nickel and beryllium-free Ti- and Zr-based Bulk Metallic Glasses (BMGs) with potential biomedical applications. The surface patterning of the BMGs is achieved by thermoplastic net-shaping (TPN) into anisotropically etched cavities of silicon chips. The forming kinetics of the BMG alloys is assessed by thermal and mechanical measurements to determine the most suitable processing temperature and time, and load applied...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Moumita Majumdar, Sayantani Saha, Indranil Dutta, Arup Sinha, Jitendra K Bera
A series of Mo2, Ru2, Rh2 and Cu2 complexes with redox-active NP-R [2-(2-R)-1,8-naphthyridine; R = pyrazinyl (NP-pz, L(1)) and thiazolyl (NP-tz, L(2))] ligands have been synthesized and characterized by X-ray crystallography and spectroscopic methods. Two NP-R ligands wrap the dimetal core by occupying four equatorial positions and two axial sites. The remaining four equatorial sites are engaged by bridging acetates in quadruply bonded cis-[Mo2(L(1))2(OAc)2][BF4]2 (1), cis-[Mo2(L(2))2(OAc)2][BF4]2 (1A), doubly bonded cis-[Ru2(L(1))2(OAc)2][ClO4]2 (3), cis-[Ru2(L(2))2(OAc)2][ClO4]2 (3A) and singly bonded trans-[Rh2(L(1))2(OAc)2][BF4]2 (5) and trans-[Rh2(L(2))2(OAc)2][BF4]2 (5A)...
February 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Paramita Bera, Chiranjit Mukherjee, Adinpunya Mitra
Floral scent composed of low molecular weight volatile organic compounds. The sweet fragrance of any evening blooming flower is dominated by benzenoid and terpenoid volatile compounds. Floral scent of Jasminum sambac (Oleaceae) includes three major benzenoid esters - benzylacetate, methylbenzoate, and methylsalicylate and three major terpene compounds viz. (E)-β-ocimene, linalool and α-farnesene. We analyzed concentrations and emission rates of benzenoids and terpenoids during the developmental stages of J...
March 2017: Plant Science: An International Journal of Experimental Plant Biology
Sabera Millan, Lakkoji Satish, Krishnendu Bera, B Susrisweta, Durg Vijay Singh, Harekrushna Sahoo
A comparative study of binding interaction between Safranin O (SO) and Neutral Red (NR) with lysozyme (Lyz) has been reported using several spectroscopic methods along with computational approaches. Steady-state fluorescence measurements revealed static quenching as the major quenching mechanism in Lyz-SO and Lyz-NR interaction, which is further supported by time-resolved fluorescence and UV-vis measurements. Additionally, binding and thermodynamic parameters of these interactions are calculated from temperature dependent fluorescence data...
February 13, 2017: Journal of Physical Chemistry. B
Sudipta Bera, Jayeeta Kolay, Siddhartha Banerjee, Rupa Mukhopadhyay
Silicon is a solid-state semi-conducting material, which has long been recognized as a technologically useful one, especially in electronics industry. However, its application in the next-generation metalloprotein-based electronics approaches has been limited. In this work, applicability of silicon as a solid support for anchoring the iron-storage protein ferritin, which has a semiconducting iron nanocore, and probing electron transport via the ferritin molecules trapped between silicon substrate and a conductive scanning probe, has been investigated...
February 1, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Sudipta Bera, Shuvojit Paul, Rajesh Singh, Dipanjan Ghosh, Avijit Kundu, Ayan Banerjee, R Adhikari
Bayesian inference provides a principled way of estimating the parameters of a stochastic process that is observed discretely in time. The overdamped Brownian motion of a particle confined in an optical trap is generally modelled by the Ornstein-Uhlenbeck process and can be observed directly in experiment. Here we present Bayesian methods for inferring the parameters of this process, the trap stiffness and the particle diffusion coefficient, that use exact likelihoods and sufficient statistics to arrive at simple expressions for the maximum a posteriori estimates...
January 31, 2017: Scientific Reports
Rafika Ben Haj Slama, Bruno Gilles, Maher Ben Chiekh, Jean-Christophe Béra
This research evaluates the use of Particle Image Velocimetry (PIV) technique for characterizing acoustic streaming flow generated by High Intensity Focused Ultrasound (HIFU). PIV qualification tests, focusing on the seeding particle size (diameter of 5, 20 and 50μm) were carried out in degassed water subjected to a focused field of 550kHz-frequency with an acoustic pressure amplitude of 5.2, 10.5 and 15.7bar at the focus. This study shows that the ultrasonic field, especially the radiation force, can strongly affect seeding particle behavior...
January 14, 2017: Ultrasonics
Biswajit Kundu, Abhijit Bera, Amlan J Pal
Through scanning tunneling spectroscopy, we envisage imaging a heterostructure, namely a junction formed in a single nanorod. While the differential conductance spectrum provides location of conduction and valence band edges, dI/dV images record energy levels of materials. Such dI/dV images at different voltages allowed us to view p- and n-sections of heterojunction nanorods and more importantly the depletion region in such a junction that has a type-II band alignment. Viewing of selective sections in a heterojunction occurred due to band-bending in the junction and is correlated to the density of states spectrum of the individual semiconductors...
January 30, 2017: Nanotechnology
Jitendra Nath Pal, Amiya Kumar Bera, Amarendra Nath Roy, Wasim Bari
INTRODUCTION: Spontaneous ruptures of extension pollicis longus tendon predominantly occur after undisplaced or minimally displaced distal radial fracture near Lister tubercle. Systemic inflammatory diseases and systemic or local steroid, mechanical causes like bony ridges, presence of bone plate or external fixator pin may precipitate this. Repetitive uses in certain occupation like cooking, cow milking, tailoring and direct trauma in kick boxer are also identified as cause. In this study it is caused by screw tip that also after 20 years...
July 2016: Journal of Orthopaedic Case Reports
Susanta Bera, Moumita Pal, Saswati Sarkar, Sunirmal Jana
Fabrication of homogeneously distributed (HD) macropores by breath figure process is an active research area. Adopting the process, for the first time, we report the fabrication of HD macro with nested meso (hierarchical) porous nanocrystalline zinc indium oxide conducting sol-gel thin film on glass by dip-coating at 45-50% room relative humidity (RH) from a solution in ethanol-2-butanol (1:1, w/w) medium with a 1:1, Zn:In ratio. In this process, solution composition and RH are found to play key roles on HD macropore generation...
January 25, 2017: ACS Applied Materials & Interfaces
Giuseppe De Tomasi, Soumya Bera, Jens H Bardarson, Frank Pollmann
We demonstrate that the quantum mutual information (QMI) is a useful probe to study many-body localization (MBL). First, we focus on the detection of a metal-insulator transition for two different models, the noninteracting Aubry-André-Harper model and the spinless fermionic disordered Hubbard chain. We find that the QMI in the localized phase decays exponentially with the distance between the regions traced out, allowing us to define a correlation length, which converges to the localization length in the case of one particle...
January 6, 2017: Physical Review Letters
Divya Sachidanandan, Haritha P Reddy, Anitha Mani, Geoffrey J Hyde, Amal Kanti Bera
Orexin-A and orexin-B (Ox-A, Ox-B) are neuropeptides produced by a small number of neurons that originate in the hypothalamus and project widely in the brain. Only discovered in 1998, the orexins are already known to regulate several behaviours. Most prominently, they help to stabilise the waking state, a role with demonstrated significance in the clinical management of narcolepsy and insomnia. Orexins bind to G-protein-coupled receptors (predominantly postsynaptic) of two subtypes, OX1R and OX2R. The primary effect of Ox-OXR binding is a direct depolarising influence mediated by cell membrane cation channels, but a wide variety of secondary effects, both pre- and postsynaptic, are also emerging...
January 19, 2017: Journal of Molecular Neuroscience: MN
Rudy Caparros Megido, Sandrine Desmedt, Christophe Blecker, François Béra, Éric Haubruge, Taofic Alabi, Frédéric Francis
Edible insects are gaining more and more attention as a sustainable source of animal protein for food and feed in the future. In Belgium, some insect products can be found on the market, and consumers are sourcing fresh insects from fishing stores or towards traditional markets to find exotic insects that are illegal and not sanitarily controlled. From this perspective, this study aims to characterize the microbial load of edible insects found in Belgium (i.e., fresh mealworms and house crickets from European farms and smoked termites and caterpillars from a traditional Congolese market) and to evaluate the efficiency of different processing methods (blanching for all species and freeze-drying and sterilization for European species) in reducing microorganism counts...
January 13, 2017: Insects
Saibal Bera, Arghya Basu, Srinu Tothadi, Bikash Garai, Subhrashis Banerjee, Kumar Vanka, Rahul Banerjee
Amine-linked (C-NH) porous organic cages (POCs) are preferred over the imine-linked (C=N) POCs owing to their enhanced chemical stability. In general, amine-linked cages, obtained by the reduction of corresponding imines, are not shape-persistent in the crystalline form. Moreover, they require multistep synthesis. Herein, a one-pot synthesis of four new amine-linked organic cages by the reaction of 1,3,5-triformylphloroglucinol (Tp) with different analogues of alkanediamine is reported. The POCs resulting from the odd diamine (having an odd number of -CH2 groups) is conformationally eclipsed, while the POCs constructed from even diamines adopt a gauche conformation...
January 18, 2017: Angewandte Chemie
Anirban Maitra, Amit Kumar Das, Ranadip Bera, Sumanta Kumar Karan, Sarbaranjan Paria, Suman Kumar Si, Bhanu Bhusan Khatua
Here, we highlight the design and fabrication of polydimethylsiloxane (PDMS) encapsulated advanced all-solid-state asymmetric supercapacitor (ASC) device consisting of hierarchical mesoporous zincironcobalt ternary oxide (ZICO) nanowire coated nickel (Ni) foam (ZICO@Ni foam) as a promising positive electrode and nitrogen doped graphene coated Ni foam (N-G@Ni foam) as negative electrode in presence of PVAKOH gel electrolyte. Owing to outstanding electrochemical behavior and ultrahigh specific capacitance of ZICO (≈ 2587...
January 17, 2017: ACS Applied Materials & Interfaces
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
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