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Dubey Anil Kumar,Singh Sudhir 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.4
Puparia of Pealius kufriensis Dubey sp. nov. found infesting a native and highly invasive plant, Rubus ellipticus Sm. (Rosaceae) are described. The host shrub was found highly infested with the new whitefly on the underside of leaves. Puparial characteristics of the genus Pealius Quaintance and Baker shared with Aleyrodes Latreille and Bemisia Quaintance and Baker are discussed.
Smart Phone Applications as a Source of Information on Stroke
Divyanshu Dubey,Amod Amritphale,Anshudha Sawhney,Nupur Amritphale,Pradeep Dubey,Ambarish Pandey 대한뇌졸중학회 2014 Journal of stroke Vol.16 No.2
Background and Purpose: Smartphone applications have been increasingly identified as a novel platform for dissemination of healthcare related information. However, there have been no studies done to evaluate the availability and content of stroke related apps. Purpose: This study aims to identify and analyze stroke-related applications available on the Apple iTunes and Android Google Play Store. Methods: The Apple iTunes store and Android Google Play Store were searched for stroke-related applications on July 27, 2013 using keywords: stroke, brain attack, intracranial hem-orrhage, subarachnoid hemorrhage, cerebral infarction. The content of the applications was analyzed by two independent investigators. Results: A total of 93 relevant applications (46.2% android and 53.8% iPhone) were identified of which 47.3% were available free of cost. 92% of apps were identified as useful by users and over 60% had scientifically valid information. There is a significant participation of healthcare agencies in dissemination of stroke related information through apps with 47.3% apps being uploaded by them. Over half of all stroke related apps were aimed towards health care workers (51.6%), 75% of which could be utilized as bedside tools for patient care and remainder had information related to recent research advances. The difference in scientific validity between the apps aimed at general population versus healthcare professionals was statistically significant (P<0.01). There was no statistical association between cost of app and scientific validity or usefulness. Conclusions: Smartphone apps are a significant source of information related to stroke. An increasing participation of healthcare agencies should be encouraged to promote dissemination of scientifically valid information.
Dubey, Pawan K.,Tripathi, Vrajesh,Singh, Ram Pratap,Sastry, K.V.H.,Sharma, G.Taru Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.9
Objective of this study was to examine the effect of sodium nitroprusside (SNP), a nitric oxide (NO) donor on steroid synthesis, growth and apoptosis of buffalo granulosa cells (GCs) in vitro. Follicular fluid of antral follicles (3-5 mm diameter) was aspirated and GCs were cultured in 0 (control), $10^{-3}$, $10^{-5}$, $10^{-7}$, $10^{-9}\;M$ of SNP for 48 h. To evaluate whether this effect was reversible, GCs were cultured in presence of $10^{-5}\;M$ SNP+1.0 mM $N^{\omega}$-nitro-L-arginine methyl ester (L-NAME) a NO synthase (NOS) inhibitor or hemoglobin (Hb, $1.0{\mu}g$) as NO scavenger. Nitrate/nitrite concentration was evaluated by Griess method, progesterone and estradiol concentrations by RIA and apoptosis by TUNEL assay. SNP ($10^{-3}$, $10^{-5}$, $10^{-7}\;M$) significantly (p<0.05) inhibited estradiol and progesterone synthesis, growth, disorganized GCs aggregates and induced apoptosis in a dose dependent manner. However, $10^{-9}\;M$ SNP induced the progesterone synthesis and stimulated GCs to develop into a uniform monolayer. Combination of SNP $10^{-5}$ M+L-NAME strengthened the inhibitory effect while, SNP+Hb together reversed these inhibitory effects. In conclusion, SNP at greater concentrations ($10^{-3}$, $10^{-5}$ and $10^{-7}\;M$) has a cytotoxic effect and it may lead to cell death whereas, at a lower concentration ($10^{-9}\;M$) induced progesterone synthesis and growth of GCs. These findings have important implications that NOS derived NO are involved at physiological level during growth and development of buffalo GCs which regulates the steroidogenesis, growth and apoptosis.
Dubey, S.P.,Dwivedi, A.D.,Lahtinen, M.,Lee, C.,Kwon, Y.N.,Sillanpaa, M. Pergamon 2013 Spectrochimica acta. Part A, Molecular and biomole Vol.103 No.-
This article is aimed to extend a simple protocol for preparation of various plant leaves extract and their application to green synthesis of the metallic nanoparticles. Five plant leaves extract showed mild reduction and stabilization ability for silver and gold nanoparticles (AgNPs and AuNPs) at room temperature. The particle size range varied from 25 to 42nm and 21 to 47nm for AgNPs and AuNPs, respectively. Plant leaves extract-mediated nanoparticles were characterized to confirm the shape, size, crystallinity, and content using different spectroscopic investigations. Differences in stability of nanoparticles at different pH were also measured by zeta potential.
Dubey, Abhishek,Park, Dae Won,Kwon, Jung Eun,Jeong, Yong Joon,Kim, Taegeun,Kim, Inhye,Kang, Se Chan,Chi, Ki-Whan Dove Medical Press 2015 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.10 No.specal
<P>Three new large hexanuclear metalla-prisms <B>9</B>–<B>11</B> incorporating 1,3, 5-tris(pyridin-4-ylethynyl)benzene (tpeb) <B>4</B> and one of the dinuclear arene ruthenium clips [Ru<SUB>2</SUB>(<I>p</I>-<I>i</I>PrC<SUB>6</SUB>H<SUB>4</SUB>Me)<SUB>2</SUB>(<I>OO</I>∩<I>OO</I>)][CF<SUB>3</SUB>SO<SUB>3</SUB>]<SUB>2</SUB> (<I>OO</I>∩<I>OO</I> =2,5-dioxydo-1,4-benzoquinonato [dobq] <B>1</B>, 5,8-dihydroxy-1,4-naphthaquinonato (donq) <B>2</B>, and 6,11-dihydroxy-5,12-naphthacenedionato [dotq] <B>3</B>), which encapsulate the guest molecule ellagic acid (2,3,7,8-tetrahydroxy-chromeno[5,4,3-cde]chromene-5,10-dione, <B>5</B>) were prepared. All complexes were isolated as triflate salts in good yields and were fully characterized by <SUP>1</SUP>H NMR spectroscopy and electrospray ionization mass spectrometry. The photophysical properties of these metalla-prisms were also investigated. Compounds <B>9</B> and <B>10</B> showed potent antioxidant activity, but <B>10</B> had the superior ORAC<SUB>PE</SUB> value (1.30±0.020). Ellagic acid (<B>5</B>) and compound <B>11</B> showed weaker activity than that of Trolox. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay showed that the metalla-prism compounds exhibit anticancer properties in vitro. Compound <B>10</B> inhibited the growth of all cancer cell lines at micromolar concentrations, with the highest cytotoxicity observed against A549 human lung cancer cells (IC<SUB>50</SUB> =25.9 μM). However, these compounds had a lower anti-cancer activity than that of doxorubicin. In a tumoricidal assay, ellagic acid (<B>5</B>) and compound <B>10</B> induced cytotoxicity in tumor cells, while doxorubicin did not. While free ellagic acid had no effect on the granulocyte-colony stimulating factor and regulated on activation normal T cell expressed and secreted protein, the encapsulated metalla-prism <B>10</B> stimulated granulocyte-colony stimulating factor and reduced regulated on activation normal T cell expressed and secreted protein expression in the RAW264.7 macrophage line. Our results show that ellagic acid encapsulated in metalla-prisms inhibited cancer cells via the modulation of mRNA induction and protein expression levels of the granulocyte-colony stimulating factor and regulated on activation normal T cell expressed and secreted protein in macrophages.</P>
Raspberry derived mesoporous carbon-tubules and fixed-bed adsorption of pharmaceutical drugs
Dubey, S.P.,Dwivedi, A.D.,Lee, C.,Kwon, Y.N.,Sillanpaa, M.,Ma, L.Q. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.3
Novel mesoporous carbon-tubules were prepared from wild plant leaves of Rubus idaeus (Raspberry) and their physicochemical characteristics were analyzed by spectroscopic and potentiometric titration methods. The developed carbon-tubules were applied for the aqueous phase decontamination of three pharmaceutical drugs. Ibuprofen, naproxen and clofibric acid were selected for the study. Batch and fixed-bed studies were performed to investigate the adsorption of selected pharmaceutical drugs. Mathematical modelings were applied to the experimental data in order to estimate the maximum adsorption capacity and evaluate the characteristics of the fixed-bed. Based on finding, the adsorption mechanism was investigated by adsorbate and adsorbent physicochemical characteristics.
Dubey, Prashant,Choi, Sang Kyu,Choi, Ji Hoon,Shin, Dong Hoon,Lee, Cheol Jin American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.6
<P>We synthesized thin-multiwalled carbon nanotubes (t-MWCNTs) using Fe-Mo/MgO catalyst by citrate precursor method based on a simple sol-gel technique. Synthesis of high-quality t-MWCNTs with uniform diameters was achieved in large-scale by catalytic decomposition of methane over Fe-Mo/MgO catalyst prepared under Ar-atmosphere. The produced t-MWCNTs had the outer diameters in the range of 4-8 nm, with a Gaussian average diameter of 6.6 +/- 0.1 nm and wall numbers in the range of of 4-7 graphenes. The product yield of the as-synthesized t-MWCNTs was over 450% relative to the used Fe-Mo/MgO catalyst, and TGA showed purity about 85%. The t-MWCNTs showed the low turn-on field about 1.24 V/microm, corresponding to the current density of 0.1 microA/cm2, and the high emission Current density of 10 mA/cm2 at the applied electric field of 2.6 V/microm. The t-MWCNTs indicate good emission stability without any fluctuation of emission current through a lifetime measurement for 20 h. It was confirmed that the field emission performance of t-MWCNTs was similar to DWCNTs and the field emission stability of t-MWCNTs was similar to MWCNTs.</P>
Dubey, Rashmi,Tewari, Ashish K.,Ravikumar, K.,Sridhar, B. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.5
Evidences have proved the versatile role of sulfur atom in supramolecular chemistry. $^1$Presence of S atom in the molecule usually results in the specific structural properties of molecules. In the present study, $S{\cdots}arene$, $N{\cdots}arene$, $CH{\cdots}{\pi}$, $CH{\cdots}S$ and $CH{\cdots}N$ type of weak interactions stabilize the conformation and self assembly of symmetrical as well as dissymmetrical molecules.
GENERALIZED COMMON FIXED POINT RESULTS FOR THREE SELF-MAPPINGS IN COMPLEX VALUED b-METRIC SPACES
Dubey Anil Kumar,Mishra Urmila,Lim W. H. 경남대학교 수학교육과 2019 Nonlinear Functional Analysis and Applications Vol.24 No.2
In this paper, some generalized common fixed point results have been proved for three self maps in the context of complex valued b-metric spaces. Our results substantially improve and generalize a number of known results.