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Paranormed I-convergent Double Sequence Spaces Associated with Multiplier Sequences
Tripathy, Binod Chandra,Sen, Mausumi Department of Mathematics 2014 Kyungpook mathematical journal Vol.54 No.2
In this article we introduce different types of multiplier I-convergent double sequence spaces. We study their different algebraic and topological properties like solidity, symmetricity, completeness etc. The decomposition theorem is established and some inclusion results are proved.
Tripathy, Binod Chandra,Borgohain, Stuti Department of Mathematics 2013 Kyungpook mathematical journal Vol.53 No.3
The sequence space $m(M,{\phi})^F$ of fuzzy real numbers is introduced. Some properties of this sequence space like solidness, symmetricity, convergence-free etc. are studied. We obtain some inclusion relations involving this sequence space.
Time-Dependent Controlof Hole-Opening Degree of Porous ZnO Hollow Microspheres
Tripathy, Nirmalya,Ahmad, Rafiq,Jeong, Han-Sol,Hahn, Yoon-Bong American ChemicalSociety 2012 Inorganic Chemistry Vol.51 No.2
<P>Well-designed, monodispersed porous ZnO hollow microsphereswithcontrolled hole-opening were successfully synthesized by a faciletwo-step solution route at low temperature. The hollow microsphereshaving average diameter of 3–4 μm showed time-dependenthole-opening, i.e. 4–100% for 15–75 min. The hole-openingpercentage increases linearly with time until complete opening. TheZnO hollow microspheres also exhibited a high surface area (34 m<SUP>2</SUP> g<SUP>–1</SUP>), a large pore volume (0.19 cm<SUP>3</SUP> g<SUP>–1</SUP>) and an average pore diameter of 3.8nm. A plausible growth mechanism for the formation of ZnO hollow microsphereswas also proposed.</P><P>Well-designed, monodispersed porous ZnOhollow microsphereswith controlled hole-opening were synthesized by a facile low temperature,two-step solution route. The hollow microspheres having average diameterof 3−4 μm showed time-dependent hole-opening. The hole-openingpercentage increases linearly with time until complete opening. TheZnO hollow microspheres also exhibited high surface area, large porevolume and average pore diameter of 3.8 nm. A plausible growth mechanismfor the formation of ZnO hollow microspheres was also proposed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2012/inocaj.2012.51.issue-2/ic2022598/production/images/medium/ic-2011-022598_0005.gif'></P>
Enhanced anticancer potency using an acid-responsive ZnO-incorporated liposomal drug-delivery system
Tripathy, Nirmalya,Ahmad, Rafiq,Ko, Hyun Ah,Khang, Gilson,Hahn, Yoon-Bong The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.9
<P>The development of stimuli-responsive nanocarriers is becoming important in chemotherapy. Liposomes, with an appropriate triggering mechanism, can efficiently deliver their encapsulated cargo in a controlled manner. We explored the use of acid-sensitive zinc oxide nanoparticles (ZNPs) as modulators of the responsive properties of liposomes. Nanocomplexes formed by the incorporation of ZNPs in liposomes (ZNP-liposomes) were designed to demonstrate the pH-responsive release of a drug (daunorubicin) without premature drug leakage and with the maintenance of the relevant therapeutic concentrations. The nanocomplexes were spherical in shape with a narrow size distribution and showed a high drug-encapsulating efficiency. Under acidic conditions, the ZNP-liposome nanocomplexes released the loaded drug more rapidly than bare liposomes. Using flow cytometry, confocal microscopy and an MTT assay, we demonstrated that these nanocomplexes were readily taken up by cancer cells, resulting in significantly enhanced cytotoxicity. On exposure to the acidic conditions inside cancer cells, the ZNPs rapidly decomposed, releasing the entrapped drug molecules from the ZNP-liposome nanocomplexes, producing widespread cytotoxic effects. The incorporated ZNPs were multimodal in that they not only resulted in a pH-responsive drug-delivery system, but they also had a synergistic chemo-photodynamic anticancer action. This design provides a significant step towards the development of multimodal liposome structures.</P>
The Spectrum of the Opertator D(r, 0, 0, s) over the Sequence Spaces c<sub>0</sub> and c
Tripathy, Binod Chandra,Paul, Avinoy Department of Mathematics 2013 Kyungpook mathematical journal Vol.53 No.2
In this paper we have examined the spectra of the operator D($r$, 0, 0, $s$) on sequence spaces $c_0$ and $c$.
Effect of ZnO nanoparticles aggregation on the toxicity in RAW 264.7 murine macrophage
Tripathy, N.,Hong, T.K.,Ha, K.T.,Jeong, H.S.,Hahn, Y.B. Elsevier Scientific Pub. Co 2014 Journal of hazardous materials Vol.270 No.-
Nanostructured zinc oxide (ZnO) has received much attention due to its biological and medical applications, where detailed knowledge about particle sizing, aggregation propensity and its related hazards are crucial. Herein, the aggregation propensity and dissolution behavior of ZnO nanoparticles in aqueous medium (PBS) were studied as a function of concentration and further correlated with its toxicity in RAW 264.7 murine macrophages. Fast formation of smaller aggregates having high dissolution rate was observed at low concentration ZnO (LC-ZnO). Compared to high concentration ZnO (HC-ZnO) aggregates, the LC-ZnO aggregates were highly pronounced in terms of reactive oxygen species generation and exerting cell apoptosis, ascribed to the secondary size effect, size-dependent cellular uptake and ion solubility. This study outlines the nanoparticle concentration as a key factor in scaling its aggregation, dissolution tendency and also emphasizes the accounting of ingested nanomaterials long-term fate inside the cells.
Metal oxide modified ZnO nanomaterials for biosensor applications
Tripathy Nirmalya,Kim Deok-Ho 나노기술연구협의회 2018 Nano Convergence Vol.5 No.27
Advancing as a biosensing nanotechnology, nanohybrids present a new class of functional materials with high selectivity and sensitivity, enabling integration of nanoscale chemical/biological interactions with biomedical devices. The unique properties of ZnO combined with metal oxide nanostructures were recently demonstrated to be an efficient approach for sensor device fabrication with accurate, real-time and high-throughput biosensing, creating new avenues for diagnosis, disease management and therapeutics. This review article collates recent advances in the modified ZnO nanostructured metal oxide nanohybrids for efficient enzymatic and non-enzymatic biosensor applications. Furthermore, we also discussed future prospects for nanohybrid materials to yield high-performance biosensor devices.
On b-Locally Open Sets in Bitopological Spaces
Tripathy, Binod Chandra,Sarma, Diganta Jyoti Department of Mathematics 2011 Kyungpook mathematical journal Vol.51 No.4
In this article we introduce the notion of b-locally open sets, $bLO^*$ sets, $bLO^{**}$ sets in bitopological spaces and obtain several characterizations and some properties of these sets.
Mesoporous ZnO nanoclusters as an ultra-active photocatalyst
Tripathy, N.,Ahmad, R.,Kuk, H.,Hahn, Y.B.,Khang, G. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.8
Morphology modulation of nanostructured materials are highly crucial for various applications including photocatalysis, drug delivery, etc. In this study, mesoporous zinc oxide (ZnO) nanoclusters (MZN) were synthesized via a simple, cost-effective, low-temperature wet chemical route and further sucessfully utilized for photodegradation of Rhodamine B (RhB). Firstly, polystyrene (PS) nanospheres (~300nm) were prepared by polymerization of styrene in aqueous solvent. Then the MZN were achieved by formation of ZnO nanoparticles-shell over the surface of PS nanospheres via esterification of zinc acetate dihydrate in isopropyl alcohol followed by toluene dissolution of PS core. The as-synthesized MZN were spherically-shaped, porous in nature with a diameter of ~ 400nm and composed of well-arranged highly-crystalline ZnO nanoparticles (~ 5nm). The MZN also exhibited a high surface area of 78.3+/-5.4m<SUP>2</SUP>g<SUP>-1</SUP> and an average pore diameter of ~26nm. Furthermore, this unique structure demonstrates an expeditious photodegradation of RhB under UV illumination, monitored by UV-visible spectroscopy at different time intervals until the dye was completely degraded to colorless end products. Fast RhB decomposition was observed with a degradation rate of ~98% within initial 40min which can be attributed to the porous nature, large specific surface area and excellent electron accepting features of the engineered nanoclusters.
Tripathy, Suman Kumar,De, Umasankar,Dehury, Niranjan,Pal, Satyanarayan,Kim, Hyung Sik,Patra, Srikanta The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.39
<P>Phpy bridged homodinuclear Ru–Ru (<B>1</B>) and heterodinuclear Ir–Ru complexes (<B>2</B>) have been developed. Complex <B>2</B> induces autophagy towards the cisplatin resistant human breast cancer (MCF7) cell line, whereas <B>1</B> is inactive.</P> <P>Graphic Abstract</P><P>Heterodinuclear Ir–Ru (<B>2</B>) with polypyridyl based phpy ligand shows autophagy induced cell death, whereas homodinuclear Ru–Ru (<B>1</B>) is inactive. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt01033g'> </P>