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Effect of Electric Field on Energy States of Electrons in Spherical Parabolic Quantum Dots
Bose,C.,Chakraborty,C.,Sarkar,C. K. 대한전자공학회 1997 ICVC : International Conference on VLSI and CAD Vol.5 No.1
An attempt is made to estimate the electric field induced shifts in electronic states in a spherical quantum dot (QD) with an isotropic parabolic potential (PP) by using a perturbation method. The results, computed for GaAs QD, shows that the electric field lowers the energy levels. The field induced energy shift is found to be the same for all levels, and also larger far a larger dot.
A Note on Spliced Sequences and A-density of Points with respect to a Non-negative Matrix
Bose, Kumardipta,Sengupta, Sayan Department of Mathematics 2019 Kyungpook mathematical journal Vol.59 No.1
For $y{\in}{\mathbb{R}}$, a sequence $x=(x_n){\in}{\ell}^{\infty}$, and a non-negative regular matrix A, Bartoszewicz et. al., in 2015, defined the notion of the A-density ${\delta}_A(y)$ of the indices of those $x_n$ that are close to y. Their main result states that if the set of limit points of ($x_n$) is countable and density ${\delta}_A(y)$ exists for any $y{\in}\mathbb{R}$ where A is a non-negative regular matrix, then ${\lim}_{n{\rightarrow}{\infty}}(Ax)_n={\sum}_{y{\in}{\mathbb{R}}}{\delta}_A(y){\cdot}y$. In this note we first show that the result can be extended to a more general class of matrices and then consider a conjecture which naturally arises from our investigations.
A note on the perimeter of fat objects
Bose, P.,Cheong, O.,Dujmovic, V. Elsevier 2011 Computational Geometry Vol.44 No.1
In this Note, we show that the size of the perimeter of (α,β)-covered objects is a linear function of the diameter. Specifically, for an (α,β)-covered object O, per(O)=<cdiam(O)αβsin<SUP>2</SUP>α, for a positive constant c. One easy consequence of the result is that every point on the boundary of such an object sees a constant fraction of the boundary. Locally γ-fat objects are a generalization of (α,β)-covered objects. We show that no such relationship between perimeter and diameter can hold for locally γ-fat objects.
Intestinal Protective Effects of Herbal-Based Formulations in Rats against Neomycin Insult
Bose, Shambhunath,Han, Kyung-Wan,Lee, Myeong-Jong,Kim, Hojun Hindawi Publishing Corporation 2013 Evidence-based Complementary and Alternative Medic Vol.2013 No.-
<P>Disturbance in the gut microbial niche by antibiotics like neomycin produces gastrointestinal (GI) disorders. Here, we evaluated the impact of a mixture of extracts of three herbs (Atractylodis Rhizoma Macrocephalae, Massa Medicata Fermentata, and Dolichoris Semen) with known GI protective activities, either laboratory unfermented (herbal formulation-1 (HF-1)) or fermented/re-fermented (herbal formulation-2 (HF-2)) on neomycin-treated rats using a commercial <I>Lactobacillus</I> probiotic as a reference. Treatment with neomycin augmented stool water content, decreased fecal population of <I>Lactobacillus</I> spp., changed the histology of intestine without inducing inflammation, reduced the colonic expression of zonula occludens-1 (ZO-1) and claudin-1, and elevated the serum C-reactive protein (CRP) and interferon-gamma (IFN-<I><I>γ</I></I>) levels. Coadministration of either HF-2 or probiotic, but not HF-1, restored the fecal content of <I>Lactobacillus</I> spp., normalized the serum CRP level, and significantly increased the colonic expression of ZO-1 and claudin-1 in neomycin-treated rats. The combined treatment with any of the above agents ameliorated the histological changes of cecum and colon in neomycin-treated rats, and the magnitude of this effect was probiotic > HF-2 > HF-1. Our study revealed the intestinal protective effect of a mixture of three herbs against neomycin insult, which is mediated through multiple mechanisms and is potentiated upon prior fermentation/refermentation of the herbs.</P>
Bose, Shambhunath,Kim, Hojun Hindawi Publishing Corporation 2013 Evidence-based Complementary and Alternative Medic Vol.2013 No.-
<P>Lipopolysaccharide (LPS), a potent inducer of systemic inflammatory responses, is known to cause impairment of intestinal barrier function. Here, we evaluated the <I>in vitro</I> protective effect of an unfermented formulation of Rhizoma Atractylodis Macrocephalae (RAM), a traditional Chinese herbal medicine widely used in the treatment of many digestive and gastrointestinal disorders, and two fermented preparations of RAM, designated as FRAM-1 (prepared in Luria-Bertani broth) and FRAM-2 (prepared in glucose), on intestinal epithelial cells (IECs) against LPS insult. In general, fermented formulations, especially FRAM-2, but not unfermented RAM, exerted an appreciable protective effect on IECs against LPS-induced perturbation of membrane resistance and permeability. Both fermented formulations exhibited appreciable anti-inflammatory activities in terms of their ability to inhibit LPS-induced gene expression and induced production of a number of key inflammatory mediators and cytokines in RAW 264.7 macrophage cells. However, in most cases, FRAM-2 exhibited stronger anti-inflammatory effects than FRAM-1. Our findings also suggest that suppression of nuclear factor-<I><I>κ</I></I><I><I>β</I></I> (NF-<I><I>κ</I></I><I><I>β</I></I>) activity might be one of the possible mechanisms by which the fermented RAM exerts its anti-inflammatory effects. Collectively, our results highlight the benefits of using fermented products of RAM to protect against LPS-induced inflammatory insult and impairment in intestinal barrier function.</P>
Carbon-based nanostructured materials and their composites as supercapacitor electrodes
Bose, Saswata,Kuila, Tapas,Mishra, Ananta Kumar,Rajasekar, R.,Kim, Nam Hoon,Lee, Joong Hee The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.3
<p>This critical review provides an overview of current research on carbon-based nanostructured materials and their composites for use as supercapacitor electrodes. Particular emphasis has been directed towards basic principles of supercapacitors and various factors affecting their performance. The focus of the review is the detailed discussion regarding the performance and stability of carbon-based materials and their composites. Pseudo-active species, such as, conducting polymer/metal oxide have been found to exhibit pseudo-capacitive behavior and carbon-based materials demonstrate electrical double layer capacitance. Carbon-based materials, such as, graphene, carbon nanotubes, and carbon nanofibers, provide high surface area for the deposition of conducting polymer/metal oxide that facilitates the efficient ion diffusion phenomenon and contribute towards higher specific capacitance of the carbon based composite materials with excellent cyclic stability. However, further scope of research still exists from the view point of developing high energy supercapacitor devices in a cost effective and simple way. This review will be of value to researchers and emerging scientists dealing with or interested in carbon chemistry.</p> <P>Graphic Abstract</P><P>This review provides a summary of on-going researches on carbon-based nanostructured materials and their composites along with a demonstration of their performance and stability for use as supercapacitor electrodes. <img src='http://pubs.rsc.org/ej/JM/2011/c1jm14468e/c1jm14468e-ga.gif'> </P>
In vivo evaluation of anti-diarrheal activity of the rhizome of Nymphaea alba (Nymphaeaceae)
Bose, Anindya,Sahoo, Moumita,Ray, Sarbani Dey 경희한의학연구센터 2012 Oriental Pharmacy and Experimental Medicine Vol.12 No.2
Ethanol extract of the of rhizome of Nymphaea alba, at graded doses was investigated for anti-diarrhoeal activity in term of reduction in the rate of defecation in castor oil induced diarrhoea and anti-inflammatory activity in term of reduction in inflammation of rat paw. To understand the mechanism of its anti-diarrhoeal activity, its effect was further evaluated on intestinal transit and castor oil induced intestinal fluid accumulation (enteropooling). At various doses (100 & 200 mg/kg body weight) the extract showed a remarkable anti-diarrhoeal activity evidenced by the reduction in the rate of defecation. Results are comparable to that of standard drug diphenoxylate (5 mg/kg body weight). A single oral dose of N. alba extract of 100 mg/kg body weight produced a significant decrease in the severity of diarrhoea. Extract produced profound decrease in intestinal transit (25.73 and 37.29%) also significantly inhibited castor oil induced enteropooling comparable to that of intraperitoneal injection of standard drug atropine sulphate at doses of 0.1 mg/kg body weight and loperamide at 5 mg/kg body weight respectively. Results indicate N. alba possess significant anti-diarrhoeal activity and may be a potent source of anti-diarrhoeal drug in future. But the extract did not show anti-inflammatory activity.