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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>
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,Laha, Paltan,Panda, Manas Kumar,Kim, Hyung Sik,Patra, Srikanta The Royal Society of Chemistry 2016 Dalton Transactions Vol.45 No.38
<P>Six mononuclear Ir complexes (1-6) using polypyridyl-pyrazine based ligands (L-1 and L-2) and {[cp*IrCl-(mu-Cl)](2) and [(ppy)(2)Ir(mu-Cl)](2)} precursors have been synthesised and characterised. Complexes 1-5 have shown potent anticancer activity against various human cancer cell lines (MCF-7, LNCap, Ishikawa, DU145, PC3 and SKOV3) while complex 6 is found to be inactive. Flow cytometry studies have established that cellular accumulation of the complexes lies in the order 2 > 1 > 5 > 4 > 3 > 6 which is in accordance with their observed cytotoxicity. No changes in the expression of the proteins like PARP, caspase 9 and beclin-1, Atg12 discard apoptosis and autophagy, respectively. Overexpression of CHOP, activation of MAPKs (P38, JNK, and ERK) and massive cytoplasmic vacuolisation collectively suggest a paraptotic mode of cell death induced by proteasomal dysfunction as well as endoplasmic reticulum and mitochondrial stress. An intimate relationship between p53, ROS production and extent of cell death has also been established using p53 wild, null and mutant type cancer cells.</P>
Outstanding Antibiofilm Features of Quanta-CuO Film on Glass Surface
Tripathy, Nirmalya,Ahmad, Rafiq,Bang, Seung Hyuck,Khang, Gilson,Min, Jiho,Hahn, Yoon-Bong American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.24
<P>Intelligently designed surface nanoarchitecture provides defined control over the behavior of cells and biomolecules at the solid liquid interface. In this study, CuO quantum dots (quanta-CuO; similar to 3-5 nm) were synthesized by a simple, low-temperature solution process and further formulated as paint to construct quanta-CuO thin film on glass. Surface morphological characterizations of the as-coated glass surface reveal a uniform film thickness (similar to 120 +/- 10 nm) with homogeneous distribution of quanta-CuO. The antibiofilm assay showed a very high contact bacteria-killing capacity of as coated quanta-CuO glass surfaces toward Staphylococcus aureus and Escherichia coli. This efficient antibacterial/antibiofilm activity was ascribed to the intracellular reactive oxygen species (ROS) generated by the quanta-CuO attached to the bacterial cells, which leads to an oxidative assault and finally results in bacterial cell death. Although there is a significant debate regarding the CuO nanostructure's antibacterial mode of action, we propose both contact killing and/or copper ion release killing mechanisms for the antibiofilm activity of quanta-CuO paint. Moreover, synergism of quanta-CuO with conventional antibiotics was also found to further enhance the antibacterial efficacy of commonly used antibiotics. Collectively, this state-of-the-art design of quanta-CuO coated glass can be envisioned as promising candidates for various biomedical and environmental device coatings.</P>
On Some New Paranormed Difference Sequence Spaces Defined by Orlicz Functions
Tripathy, Binod Chandra,Dutta, Hemen Department of Mathematics 2010 Kyungpook mathematical journal Vol.50 No.1
The main aim of this article is to introduce a new class of sequence spaces using the concept of n-norm and to investigate these spaces for some linear topological structures as well as examine these spaces with respect to derived (n-1)-norm. We use an Orlicz function, a bounded sequence of positive real numbers and some difference operators to construct these spaces so that they become more generalized and some other spaces can be derived under special cases. These investigations will enhance the acceptability of the notion of n-norm by giving a way to construct different sequence spaces with elements in n-normed spaces.
Sequence Spaces of Fuzzy Real Numbers Using Fuzzy Metric
Tripathy, Binod Chandra,Borgohain, Stuti Department of Mathematics 2014 Kyungpook mathematical journal Vol.54 No.1
The sequence spaces $c^F$(M), $c^F_0$(M) and ${\ell}^F$(M) of fuzzy real numbers with fuzzy metric are introduced. Some properties of these sequence spaces like solidness, symmetricity, convergence-free etc. are studied. We obtain some inclusion relations involving these sequence spaces.
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.
Use of human patient simulator for apnea studies: a preliminary in vitro trial
Tripathy Debendra K,Dhar Mridul,Bhardwaj Bharat B,Hemanthkumar K,Talawar Praveen,Rao Shalinee 대한마취통증의학회 2022 Korean Journal of Anesthesiology Vol.75 No.5
Background: Modern human patient simulators (HPSs) could be used for researching critical scenarios such as apnea oxygenation. We aimed to study the use of a high-fidelity HPS to assess prolonged apnea using various oxygenation strategies with a simple high-flow nasal cannula (15 L/min). Methods: An experimental simulation study using an HPS (CAE Healthcare™) was conducted after obtaining approval from the Institutional Review Board. The HPS responded according to real-time physiologically modeled responses to external gases, such as oxygen (O2). Apnea experiments were performed with different physiological settings, such as shunt fraction (5%) and O2 consumption (250, 500, and 750 ml/min). The following four apnea experiments were conducted: no oxygenation (NO), apnea oxygenation alone (AO), preoxygenation alone (PO), and para-oxygenation (PAO). The time to 92%, 75%, and 50% saturation was recorded. Alveolar and arterial gas levels were recorded till 50% saturation. Results: At 250 ml/min, PO (1121 s) and PAO (1274.5 s) had a significantly longer time to 50% saturation (400% increase) compared to NO (222.5 s) and AO (239 s). A similar trend was observed for the time to 92% and 75% saturation. At higher O2 consumption rates, a shorter time to desaturation was observed. Conclusions: Apnea trends in the HPS correlated with similar prior human experiments. AO without preoxygenation was found to provide no additional benefit. Preoxygenation with high-flow O2 via nasal cannula prolonged the time to desaturation in the PAO more than PO scenario. Therefore, HPSs can be used in future studies where patient safety is a concern.
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 $c$.
On I-Convergent Double Sequences of Fuzzy Real Numbers
Tripathy, Binod Chandra,Sarma, Bipul Department of Mathematics 2012 Kyungpook mathematical journal Vol.52 No.2
In this article we introduce the class of I-convergent double sequences of fuzzy real numbers. We have studied different properties like solidness, symmetricity, monotone, sequence algebra etc. We prove that the class of I-convergent double sequences of fuzzy real numbers is a complete metric spaces.