Wyniki wyszukiwania dla: I. Sinha

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Autologous fat transplantation alters gene expression patterns related to inflammation and hypoxia in the irradiated human breast

A. Lindegren, I. Schultz, I. Sinha, L. Cheung, więcej

British Journal of Surgery > 106 > 5 > 563 - 573

Background Radiation‐induced fibrosis, an adverse effect of breast cancer treatment, is associated with functional and cosmetic impairment as well as surgical complications. Clinical reports suggest improvement following autologous fat transplantation, but the mechanisms underlying this effect are unknown. A global gene expression analysis was undertaken to identify genetic pathways dysregulated...

artykuł

Ag-Cu bimetallic nanocatalysts for p-nitrophenol reduction using a green hydrogen source

A.D. Verma, Shaili Pal, Pratibha Verma, Vandana Srivastava, więcej

Journal of Environmental Chemical Engineering > 2017 > 5 > 6 > 6148-6155

The quest for new nanomaterials that can efficiently catalyze reduction reactions using green transfer hydrogenation process is an important current area of research. Conventionally, NaBH₄, which is both expensive and toxic, has been the reducing agent for the model catalytic reduction of p-nitrophenol (Nip) to p-aminophenol (AP). The present communication studies the application of Ag-Cu bimetallic...

artykuł

Oxygen reduction reaction on anisotropic silver nanoparticles in alkaline media

Rajeev Kumar Gupta, A.D. Verma, I. Sinha, Manisha Malviya

Chemical Physics Letters > 2017 > 680 > C > 6-9

The effect of anisotropy of Ag nanoparticles on their electrocatalytic activity was investigated. By using increasing amounts of Cu salt etchant, we could obtain two AgNPs samples (S1 and S2) with different percentages of anisotropic nanoparticles. The third AgNPs sample was synthesized in the absence of any etchant and therefore resulted in the formation of only spherical nanoparticles. Investigation...

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EPS1.10 Misleading conclusions (“spin”) in the abstracts of published randomised controlled trial reports in cystic fibrosis

A.J. Cleator, S. Mayell, K.W. Southern, I. Sinha

Journal of Cystic Fibrosis > 2017 > 16 > S1 > S38

artykuł

Green synthesis and catalytic application of curcumin stabilized silver nanoparticles

A D Verma, N Jain, S K Singha, M A Quraishi, więcej

Journal of Chemical Sciences > 2016 > 128 > 12 > 1871-1878

An ultrasonication based green synthesis approach was used to prepare curcumin-stabilized silver nanoparticles (c-AgNPs). Nanoparticles thus obtained were characterized by UV-Visible spectroscopy, X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Two different size distributions of c-AgNPs were obtained by changing the ratio of curcumin...

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Methionine-restricted diet inhibits growth of MCF10AT1-derived mammary tumors by increasing cell cycle inhibitors in athymic nude mice

J. R. Hens, I. Sinha, F. Perodin, T. Cooper, więcej

BMC Cancer > 2016 > 16 > 1 > 1-13

Background Dietary methionine restriction (MR) improves healthspan in part by reducing adiposity and by increasing insulin sensitivity in rodent models. The purpose of this study was to determine whether MR inhibits tumor progression in breast cancer xenograft model and breast cancer cell lines. Methods Athymic nude mice were injected with MCF10AT1 cells in Matrigel® and fed a diet containing either...

artykuł

Erratum to: Methionine-restricted diet inhibits growth of MCF10AT1-derived mammary tumors by increasing cell cycle inhibitors in athymic nude mice

J. R. Hens, I. Sinha, F. Perodin, T. Cooper, więcej

BMC Cancer > 2016 > 16 > 1 > 1-2

artykuł

Effect of Surface Oxide Transformation on CO Oxidation

I. Sinha, A. K. Mukherjee

Brazilian Journal of Physics > 2015 > 45 > 1 > 72-78

Under sub-atmospheric conditions, many metal catalyst surfaces for CO oxidation transform to the oxide phase with higher catalytic activity than chemisorbed oxygen. The surface phase transformation from metal to its oxide could be by collective oxidation of the adsorbed oxygen sites as soon as their coverage reaches a global critical threshold, or such oxidation may be restricted to small patches...

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Chromium removal from aqueous media by superparamagnetic starch functionalized maghemite nanoparticles

P N Singh, D Tiwary, I Sinha

Journal of Chemical Sciences > 2015 > 127 > 11 > 1967-1976

Superparamagnetic starch functionalized maghemite nanoparticles (SMhNPs) were synthesised by a co-precipitation method via in situ functionalization and used as nano-adsorbents for the removal of Cr(VI) from aqueous waste. The characterization of the prepared nanoparticles was done by XRD, FTIR, TEM and VSM techniques. Adsorption of Cr(VI) on the surface of superparamagnetic starch functionalized...

artykuł

Kinetics of p-Nitrophenol Reduction Catalyzed by PVP Stabilized Copper Nanoparticles

A. D. Verma, R. K. Mandal, I. Sinha

Catalysis Letters > 2015 > 145 > 10 > 1885-1892

Copper nanoparticles (CuNPs) in aqueous medium were prepared with alkaline hydrazine hydrate as the reductant and PVP as the stabilizing agent without any inert gas protection. Careful variation in the amount of reductant resulted in formation of two stable CuNPs dispersions with different average sizes and consequently different localized surface plasmon resonance absorbances. These two as-synthesized...

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Improved removal of Cr(VI) by starch functionalized iron oxide nanoparticles

P.N. Singh, D. Tiwary, I. Sinha

Journal of Environmental Chemical Engineering > 2014 > 2 > 4 > 2252-2258

We investigate the effect of starch functionalization of iron oxide nanoparticles on their adsorption of Cr(VI) from aqueous solutions. Iron oxide nanoparticles (IONPs) are synthesized by alkaline hydrolysis of FeCl ₃ . The rate of addition of the base determines the time of aging of the reaction mixture at increasing pH values. This affects the iron oxide phase composition, nanoparticle sizes...

artykuł

Efficacy of bioconversion of paper mill bamboo sludge and lime waste by composting and vermiconversion technologies

B. Sahariah, I. Sinha, P. Sharma, L. Goswami, więcej

Chemosphere > 2014 > 109 > Complete > 77-83

Paper Mill Bamboo Sludge (PMBS) and Paper Mill Lime Waste (PMLW) are extensively produced as solid wastes in paper mills. Untreated PMBS and PMLW contain substantial amount of heavy metals (Zn, Pb, Ni, Cd, Cr) in soluble forms. Efficiency of vermiconversion and aerobic composting with these wastes is reported here. Adopted bioconversion systems enhanced the availability of some essential nutrients...

artykuł

Simulating interactions between nanoparticles in Lennard-Jones liquids

Shailendra Kumar Verma, A.K. Mukherjee, I. Sinha

Chemical Physics Letters > 2013 > 572 > Complete > 85-89

Off-lattice Monte Carlo simulations in the NVT ensemble are employed to study the interaction forces between nanoparticles in Lennard-Jones (L-J) liquids. We consider solvophilic, neutral and solvophobic interactions between the solvent atoms and those that make up the nanoparticles. Neutral and solvophobic nanoparticles are found to coalesce even at intermediate distances. On the other hand, solvophilic...

artykuł

Monte Carlo simulation of a surface oxide model of CO oxidation

I. Sinha, A.K. Mukherjee

Chemical Physics Letters > 2012 > 553 > Complete > 30-35

A kinetic Monte Carlo surface reaction lattice gas model is investigated for CO oxidation under sub-atmospheric conditions. The present Letter incorporates recent experimental observations suggesting the formation of surface oxide phase with higher catalytic activity than chemisorbed oxygen. Rate oscillations occur due to collective oxidation of the adsorbed oxygen sites as soon as their coverage...

artykuł

First-Order Phase Transition in a Modified Ziff-Gulari-Barshad Model with Self-oscillating Reactant Coverages

I. Sinha, A. K. Mukherjee

Journal of Statistical Physics > 2012 > 146 > 4 > 669-686

Using kinetic Monte Carlo simulations, we study the effect of oscillatory kinetics due to surface reconstructions on Ziff-Gulari-Barshad (ZGB) model discontinuous phase transition. To investigate the transition, we do extensive finite size scaling analysis. It is found that the discontinuous transition still exists. On inclusion of desorption in the model, the order-parameter probability distribution...

artykuł

Effect of Droplet Size on the First Order Ziff-Gulari-Barshad (ZGB) Phase Transition

I. Sinha, A. K. Mukherjee

Journal of Statistical Physics > 2012 > 147 > 4 > 707-715

We introduce a new method to analyze the coexistence region of the constant rate ensemble ZGB discontinuous transition. The method clearly delineates the spinodal and coexistence points in the constant rate ZGB model. Increase in system size reduces the gap between the spinodal and coexistence points. Next we quantify the effect of metastability by introducing a droplet/nucleus of CO occupied sites...

artykuł

Synthesis of anisotropic silver nanostructures in presence of polyvinyl pyrrolidone (PVP): LSPR and SAXS analysis

Manjeet Singh, A.K. Singh, R.K. Mandal, I. Sinha

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2011 > 390 > 1-3 > 167-172

We study polyvinyl pyrrolidone (PVP) stabilization of aqueous phase silver nanoparticles (AgNPs) sols. Glucose is used as the reducing agent. Addition of increasing amounts of NaOH cause interesting variations in sol pH and localized surface plasmon resonance (LSPR) behavior. The LSPR information is coupled with small angle X-ray scattering (SAXS) analysis and TEM imaging to delineate various nanoparticle...

artykuł

LSPR and SAXS studies of starch stabilized Ag–Cu alloy nanoparticles

Manjeet Singh, I. Sinha, A.K. Singh, R.K. Mandal

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2011 > 384 > 1-3 > 668-674

We report the aqueous phase chemical reduction synthesis of starch stabilized Ag–Cu alloy nanoparticles. Changing the proportions of Ag and Cu precursor salts leads to different levels of solid solubility. The variations in the localized surface plasmon resonance (LSPR) absorbance of sols are analyzed from the perspective of nanoparticles composition and their structural features. Small angle X-ray...

artykuł

Avrami exponent under transient and heterogeneous nucleation transformation conditions

I. Sinha, R.K. Mandal

Journal of Non-Crystalline Solids > 2011 > 357 > 3 > 919-925

The Kolmogorov–Johnson–Mehl–Avrami model for isothermal transformation kinetics is universal under specific assumptions. However, the experimental Avrami exponent deviates from the universal value. In this context, we study the effect of transient heterogeneous nucleation on the Avrami exponent for bulk materials and also for transformations leading to nanostructured materials. All transformations...

artykuł

Formation of fractal aggregates during green synthesis of silver nanoparticles

Manjeet Singh, I. Sinha, A. K. Singh, R. K. Mandal

Journal of Nanoparticle Research > 2011 > 13 > 1 > 69-76

The aggregation behavior of silver nanoparticles (AgNPs) prepared by a green synthesis procedure using starch as the stabilizer was studied by the small angle X-ray scattering (SAXS) technique. The protecting ability of starch was affected by the presence of NaOH leading to different aggregation behaviors. In all the samples, mass as well as surface fractal regimes were observed. Assuming spherical...

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