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C60 embedded diamond-like nanocomposite thin film
Jana Sukhendu,Das Sayan,De Debasish,Shakti Nanda,Mondal Anup,Bhattacharya Sekhar,Gongopadhyay Utpal 한국탄소학회 2022 Carbon Letters Vol.32 No.1
Diamond-like nanocomposite (DLN) has become a promising thin film for many fields of applications due to its unique and tunable properties. However, low optical bandgap and thermal stability limits its application in many fields particularly as antireflection coating on solar cell. In the present study, the DLN thin film has been deposited using a mixed liquid precursor by rf-PECVD process. Surprisingly the presence of nc-C60 in FCC structure in DLN matrix has been observed. The degree of crystallinity and diameter of C60 have been increased significantly after annealed at 850 °C. The film has been annealed at 850 °C to primarily investigate its feasibility as antireflection coating (ARC) in compatible with industrial solar cell fabrication process. The refractive index and optical bandgap of the film were around 1.80 and 4.10 eV, respectively. Moreover, the optical bandgap has decreased to some extent to 3.92 eV even after annealing at such high temperature. The high SiOx at% and embedded nc-C60 enhanced the optical transparency and thermal stability of the DLN film. The solar-weighted average reflection of DLN-coated textured silicon was reduced significantly to 1.91%. The C60 embedded DLN film has a great potential to apply in different optoelectronic devices especially in solar cell as ARC.
Gemcitabine–Coumarin–Biotin Conjugates: A Target Specific Theranostic Anticancer Prodrug
Maiti, Sukhendu,Park, Nayoung,Han, Ji Hye,Jeon, Hyun Mi,Lee, Jae Hong,Bhuniya, Sankarprasad,Kang, Chulhun,Kim, Jong Seung American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.11
<P>We present here, the design, synthesis, spectroscopic characterization, and <I>in vitro</I> biological assessment of a gemcitabine–coumarin–biotin conjugate (<B>5</B>). Probe <B>5</B> is a multifunctional molecule composed of a thiol-specific cleavable disulfide bond, a coumarin moiety as a fluorescent reporter, gemcitabine (GMC) as a model active drug, and biotin as a cancer-targeting unit. Upon addition of free thiols that are relatively abundant in tumor cells, disulfide bond cleavage occurs as well as active drug GMC release and concomitantly fluorescence intensity increases. Confocal microscopic experiments reveal that <B>5</B> is preferentially taken up by A549 cells rather than WI38 cells. Fluorescence-based colocalization studies using lysosome- and endoplasmic reticulum-selective dyes suggest that thiol-induced disulfide cleavage of <B>5</B> occur in the lysosome possibly via receptor-mediated endocytosis. The present drug delivery system is a new theranostic agent, wherein both a therapeutic effect and drug uptake can be readily monitored at the subcellular level by two photon fluorescence imaging.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-11/ja401350x/production/images/medium/ja-2013-01350x_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja401350x'>ACS Electronic Supporting Info</A></P>
Nath, Sukhendu,Pal, Haridas,Sapre, Avinash.V.,Mittal, Jai.P. Korean Society of Photoscience 2003 Journal of Photosciences Vol.10 No.1
Fullerenes, $C_{60}$ and $C_{70}$, display interesting physicochemical properties in solutions, especially due to their unique chemical structures and their good electron accepting abilities. Solubility of fullerenes in different organic solvents and their unusual solvatochromic behavior, the ability of the fullerenes to form aggregates in solutions, and their electron transfer and charge transfer interactions with variety of electron donors, are the subjects of extensive research activities for more than one decade. Many research groups including ours have contributed substantially in the understanding of the solvatochromism, aggregation behavior, and the photoinduced electron transfer and charge transfer chemistry of fullerenes, in condensed phase. Present article is aimed to summarize the important results reported on the above aspects of fullerenes, subsequent to the earlier report from our group (D.K. Palit and J.P. Mittal, Full. Sci. & Tech. 3, 1995, 643-659).)., 643-659)..
Derivations with annihilator conditions in prime rings
Basudeb Dhara,Sukhendu Kar,Sachhidananda Mondal 대한수학회 2013 대한수학회보 Vol.50 No.5
Let R be a prime ring, I a nonzero ideal of R, d a derivation of R, m(≥ 1), n(≥ 1) two fixed integers and a ∈ R. (i) If a((d(x)y + xd(y) + d(y)x + yd(x))n − (xy + yx))m = 0 for all x, y ∈ I, then either a = 0 or R is commutative; (ii) If char(R) 6≠2 and a((d(x)y + xd(y) + d(y)x +yd(x))n −(xy +yx)) ∈ Z(R) for all x, y ∈ I, then either a = 0 or R is commutative.
Jung, Danbi,Maiti, Sukhendu,Lee, Jae Hong,Lee, Joung Hae,Kim, Jong Seung The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.23
<P>Biotin–disulfide–coumarin conjugates are designed and synthesized as novel fluorescent sensors for cancer targeted intracellular thiol imaging in living organisms. <I>In vitro</I> experiments disclose that probe 6 is preferentially taken up by biotin receptor-positive A549 tumor cells through receptor mediated endocytosis.</P> <P>Graphic Abstract</P><P>We developed a target specific thiol probe for rapidly sensing thiols in the cancer cells and cellular imaging. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc49790a'> </P>
DERIVATIONS WITH ANNIHILATOR CONDITIONS IN PRIME RINGS
Dhara, Basudeb,Kar, Sukhendu,Mondal, Sachhidananda Korean Mathematical Society 2013 대한수학회보 Vol.50 No.5
Let R be a prime ring, I a nonzero ideal of R, $d$ a derivation of R, $m({\geq}1)$, $n({\geq}1)$ two fixed integers and $a{\in}R$. (i) If $a((d(x)y+xd(y)+d(y)x+yd(x))^n-(xy+yx))^m=0$ for all $x,y{\in}I$, then either $a=0$ or R is commutative; (ii) If $char(R){\neq}2$ and $a((d(x)y+xd(y)+d(y)x+yd(x))^n-(xy+yx)){\in}Z(R)$ for all $x,y{\in}I$, then either $a=0$ or R is commutative.
A Note on Regular Ternary Semirings
DUTTA, TAPAN KUMAR,KAR, SUKHENDU 대한수학회 2006 Kyungpook mathematical journal Vol.46 No.3
This paper is a sequel of our previous paper [1]. In this paper, we introduce the notions of regular ideal and partial ideal (p-ideal) in a ternary semiring and using these two notions we characterize regular ternary semiring.
GENERALIZED DERIVATIONS WITH CENTRALIZING CONDITIONS IN PRIME RINGS
Das, Priyadwip,Dhara, Basudeb,Kar, Sukhendu Korean Mathematical Society 2019 대한수학회논문집 Vol.34 No.1
Let R be a noncommutative prime ring of characteristic different from 2, U the Utumi quotient ring of R, C the extended centroid of R and f($x_1,{\ldots},x_n$) a noncentral multilinear polynomial over C in n noncommuting variables. Denote by f(R) the set of all the evaluations of f($x_1,{\ldots},x_n$) on R. If d is a nonzero derivation of R and G a nonzero generalized derivation of R such that $$d(G(u)u){\in}Z(R)$$ for all $u{\in}f(R)$, then $f(x_1,{\ldots},x_n)^2$ is central-valued on R and there exists $b{\in}U$ such that G(x) = bx for all $x{\in}R$ with $d(b){\in}C$. As an application of this result, we investigate the commutator $[F(u)u,G(v)v]{\in}Z(R)$ for all $u,v{\in}f(R)$, where F and G are two nonzero generalized derivations of R.
Bhuniya, Sankarprasad,Lee, Min Hee,Jeon, Hyun Mi,Han, Ji Hye,Lee, Jae Hong,Park, Nayoung,Maiti, Sukhendu,Kang, Chulhun,Kim, Jong Seung The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.64
<P>We present the design, synthesis, optical properties and <I>in vitro</I> biological assessments of the theranostic prodrug <B>6</B> in which a near IR fluorophore is conjugated with a cancer cell-directing biotin unit; further it is linked with the anti-cancer drug gemcitabine <I>via</I> a self-immolative spacer, a disulfide bond. The prodrug <B>6</B> is able to monitor drug delivery and cellular imaging.</P> <P>Graphic Abstract</P><P>We developed a bifunctional theranostic prodrug that instantaneously monitors target specific delivery of gemcitabine and cellular imaging by the action of cellular enzyme. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc42653j'> </P>