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Priyadarshini P, Das S, Alagarasan D, Ganesan R, Varadharajaperumal S, Naik R. Author Correction: Observation of high nonlinearity in Bi doped Bi xIn 35-xSe 65 thin films with annealing. Sci Rep 2024; 14:9611. [PMID: 38671067 PMCID: PMC11053047 DOI: 10.1038/s41598-024-60479-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2024] Open
Affiliation(s)
- P Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India
| | - Subhashree Das
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - R Ganesan
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - S Varadharajaperumal
- Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Ramakanta Naik
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India.
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Rastogi G, Mohapatra A, Mishra P, Mandal S, Kulkarni R, Ganesan R, Thamizhavel A, Kumar PSA. Crossover from gapped-to-gapless Dirac surface states in magnetic topologicalinsulator MnBi₂Te₄. J Phys Condens Matter 2023. [PMID: 37883988 DOI: 10.1088/1361-648x/ad0765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Intrinsic magnetic topological insulators (MTI) host exotic topological phases such as quantized anomalous Hall insulating phase, arising due to the large magnetic exchange gap. However, the interplay of magnetism and topology in these systems in different temperature regimes remains elusive. In this work, we present the logarithmic temperature-dependence of conductivity for sub-100 nm thick exfoliated flakes of MTI MnBi2Te4 in the presence of out-of-plane magnetic fields and extracted the linear slope, κ. We observed a characteristic change, ∆κ ∼ -0.5 in the low-temperature regime, indicating the gapped Dirac surface state according to Lu-Shen theory. We also report the recovery of topological properties in the system via the weak-antilocalization (WAL) effect in the vicinity of antiferromagnetic to paramagnetic transition and in the paramagnetic regime. Hikami-Larkin-Nagaoka (HLN) analysis suggested the presence of topological surface states. Therefore, our study helps in understanding how intrinsic magnetism masks topological properties in an MTI as long as magnetic ordering persists.
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Affiliation(s)
- Gagan Rastogi
- Department of Physics, Indian Institute of Science, Bangalore 560 012, Bangalore, Karnataka, 560012, INDIA
| | - Abhinab Mohapatra
- Indian Institute of Science, Department of Physics, Bangalore, Karnataka, 560012, INDIA
| | - Pramita Mishra
- Physics, Indian Institute of Science, IISc, Bangalore, Bangalore, Karnataka, 560012, INDIA
| | - Shoubhik Mandal
- Physics, Indian Institute of Science, IISc, Bangalore, Bangalore, Karnataka, 560012, INDIA
| | - Ruta Kulkarni
- DCMP&MS, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, Mumbai, Maharashtra, 400005, INDIA
| | - R Ganesan
- Department of Physics, Indian Institute of Science, Bangalore 560 012, Bangalore, Karnataka, 560012, INDIA
| | - Arumugam Thamizhavel
- Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Dr. Homi Bhabha Road, Colaba, Mumbai, Mumbai, Maharashtra, 400005, INDIA
| | - P S Anil Kumar
- Department of Physics, Indian Institute of Science, Bangalore 560 012, Bangalore, Karnataka, 560012, INDIA
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Sahoo D, Priyadarshini P, Dandela R, Alagarasan D, Ganesan R, Varadharajaperumal S, Naik R. Correction: In situ laser irradiation: the kinetics of the changes in the nonlinear/linear optical parameters of As 50Se 40Sb 10 thin films for photonic applications. RSC Adv 2023; 13:29342. [PMID: 37818269 PMCID: PMC10560874 DOI: 10.1039/d3ra90098c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 10/02/2023] [Indexed: 10/12/2023] Open
Abstract
[This corrects the article DOI: 10.1039/D1RA02368C.].
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Affiliation(s)
- D Sahoo
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - P Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - R Dandela
- Department of Industrial & Engineering Chemistry, ICT-IOC Bhubaneswar 751013 India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - R Ganesan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - S Varadharajaperumal
- Centre for Nano Science and Engineering, Indian Institute of Science Bangalore 560012 India
| | - R Naik
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
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Parida A, Alagarasan D, Ganesan R, Bisoyi S, Naik R. Correction: Influence of time dependent laser-irradiation for tuning the linear-nonlinear optical response of quaternary Ag 10In 15S 15Se 60 films for optoelectronic applications. RSC Adv 2023; 13:28337-28338. [PMID: 37772269 PMCID: PMC10523445 DOI: 10.1039/d3ra90094k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 09/19/2023] [Indexed: 09/30/2023] Open
Abstract
[This corrects the article DOI: 10.1039/D2RA07981J.].
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Affiliation(s)
- Abinash Parida
- Department of Engineering and Materials Physics, ICT-IOC Bhubaneswar 751013 India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science Bengaluru 560012 India
- Department of Physics, NITTE Meenakshi Institute of Technology Yelahanka Bengaluru 560064 India
| | - R Ganesan
- Department of Physics, Indian Institute of Science Bengaluru 560012 India
| | - Sagar Bisoyi
- Department of Physics, School of Applied Science, KIIT Deemed to be University Bhubaneswar 751024 India
| | - R Naik
- Department of Engineering and Materials Physics, ICT-IOC Bhubaneswar 751013 India
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Giri S, Priyadarshini P, Alagarasan D, Ganesan R, Naik R. Annealing-induced phase transformation in In 10Se 70Te 20 thin films and its structural, optical and morphological changes for optoelectronic applications. RSC Adv 2023; 13:24955-24972. [PMID: 37614788 PMCID: PMC10442775 DOI: 10.1039/d3ra03731b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 08/09/2023] [Indexed: 08/25/2023] Open
Abstract
In2Se3 and In2Te3 have great importance in various device fabrications. The present report is based on the annealing-induced phase formation of both In2Se3 and In2Te3 from In10Se70Te20 thin films at different annealing temperatures as found from the XRD analysis and well supported by the Raman study. The average crystallite size increased with a decrease in the dislocation density. The surface morphology changed with annealing and increased in particle size as noticed from the FESEM images. The uniform distribution and presence of constituent elements in the film were verified using EDX data. The increase in transmittance is accompanied by a decrease in extinction coefficient, optical density and increase in skin depth with annealing. The increase in optical bandgap from 0.418 eV to 0.645 eV upon annealing at 250 °C is associated with a decrease in disorder. The steepness parameter increased and the Se-p value decreased with annealing. The refractive index decreased with an increase in oscillator energy and decrease in dispersion energy. The quality factor, dielectric loss, optical conductivity and electrical susceptibility decreased. The optical electronegativity and plasma frequency increased with annealing. There is a significant change in the non-linear susceptibility and non-linear refractive index with annealing. The observed changes in the film structure and optical behaviour are due to the annealing-induced phase formation from the In10Se70Te20 host matrix upon annealing. Such materials are suitable for optoelectronic and phase change devices.
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Affiliation(s)
- Sasmita Giri
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - P Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - D Alagarasan
- Nitte Meenakshi Institute of Technology Yelahanka Bengaluru 560064 India
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - R Ganesan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - R Naik
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
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Mandal S, Mallick D, Bitla Y, Ganesan R, Kumar PSA. Bulk-surface coupling in dual topological insulator Bi 1Te 1and Sb-doped Bi 1Te 1single crystals via electron-phonon interaction. J Phys Condens Matter 2023; 35:285001. [PMID: 36731168 DOI: 10.1088/1361-648x/acb89c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Accepted: 02/01/2023] [Indexed: 06/18/2023]
Abstract
Recently,Bi1Te1has been proved to be a dual topological insulator (TI), a new subclass of symmetry-protected topological phases, and predicted to be higher order topological insulator (HOTI). Being a dual TI (DTI), Bi1Te1is said to host quasi-1D surface states (SSs) due to weak TI phase and topological crystalline insulating SSs at the same time. On the other hand, HOTI supports topologically protected hinge states. So,Bi1Te1is a unique platform to study the electrical signature of topological SS (TSS) of fundamentally different origins. Though there is a report of magneto-transport measurements on large-scale Bi1Te1thin films, the Bi1Te1single crystal is not studied experimentally to date. Even the doping effect in a DTI Bi1Te1is missing in the literature. In this regard, we performed the perpendicular and parallel field magneto-transport measurement on the exfoliated microflake of Bi1Te1and Sb-doped Bi1Te1single crystals, grown by the modified Bridgmann method. Ourmetallicsample shows the weak anti-localization behavior analyzed by the multi-channel Hikami-Larkin-Nagaoka equation. We observed the presence of a pair of decoupled TSS. Further, we extracted the dephasing index (β) from temperature (T)-dependence of phase coherence length (Lϕ), following the power law equation (Lϕ∝T-β). The thickness-dependent value ofβindicates the transition in the dephasing mechanism from electron-electron to electron-phonon interaction with the increase in thickness, indicating the enhancement in the strength of bulk-surface coupling. Sb-doped system shows weakened bulk-surface coupling, hinted by the reduced dephasing indices.
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Affiliation(s)
- Shoubhik Mandal
- Department of Physics, Indian Institute of Science, Bengaluru, Karnataka 560012, India
| | - Debarghya Mallick
- Department of Physics, Indian Institute of Science, Bengaluru, Karnataka 560012, India
- Present address: Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Rd, Piscataway, NJ 08854, United States of America
| | - Yugandhar Bitla
- Department of Physics, School of Physical Sciences, Central University of Rajasthan, Ajmer, Rajasthan 305817, India
| | - R Ganesan
- Department of Physics, Indian Institute of Science, Bengaluru, Karnataka 560012, India
| | - P S Anil Kumar
- Department of Physics, Indian Institute of Science, Bengaluru, Karnataka 560012, India
- Center for Nanoscience and Engineering (CeNSE), Indian Institute of Science, Bengaluru, Karnataka 560012, India
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Parida A, Alagarasan D, Ganesan R, Bisoyi S, Naik R. Influence of time dependent laser-irradiation for tuning the linear-nonlinear optical response of quaternary Ag 10In 15S 15Se 60 films for optoelectronic applications. RSC Adv 2023; 13:4236-4248. [PMID: 36744282 PMCID: PMC9890660 DOI: 10.1039/d2ra07981j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 01/25/2023] [Indexed: 02/05/2023] Open
Abstract
The impact of laser irradiation on thin films results in multiple beneficial modifications of their structural, morphological, nonlinear-linear properties for optoelectronics applications. This work deals with the thermally evaporated Ag10In15S15Se60 films and post-laser irradiation to study the variations in structural and optical properties. The current investigation was carried out for different laser irradiation time durations such as 0, 10, 20, 30, and 60 minutes by 532 nm laser (2.34 eV). According to the X-ray diffraction analysis, all thin films have polycrystalline character. The change in the surface morphology after being exposed to the laser has been checked by FESEM, whereas the presence of constitutional elements has been verified by the EDX study. The related changes with laser irradiation in the optical properties, including both linear and nonlinear, were studied using UV-Vis spectroscopy data. The irradiation caused an enhancement in the transmission, and the absorption edge moved towards a lower wavelength, increasing the bandgap energy from 1.71 eV to 1.88 eV. The refractive index reduced as a result of the film's altered structure. The behaviour of the refractive index satisfies Moss's rule (E g n 4 = const). The nonlinear refractive index, first-order and 3rd order nonlinear susceptibility, is found to be decreased with laser irradiation. The dielectric parameters are also observed to be decreased with irradiation. Considering all the alterations in its properties caused by irradiation, the Ag10In15S15Se60 sample could be a favourable material for various photonic devices.
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Affiliation(s)
- Abinash Parida
- Department of Engineering and Materials Physics, ICT-IOC Bhubaneswar 751013 India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science Bengaluru 560012 India
- Department of Physics, NITTE Meenakshi Institute of Technology Yelahanka Bengaluru 560064 India
| | - R Ganesan
- Department of Physics, Indian Institute of Science Bengaluru 560012 India
| | - Sagar Bisoyi
- Department of Physics, School of Applied Science, KIIT Deemed to be University Bhubaneswar 751024 India
| | - R Naik
- Department of Engineering and Materials Physics, ICT-IOC Bhubaneswar 751013 India
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James MT, Mandal S, Sebastian NK, Mishra P, Ganesan R, Kumar PSA. Probing electron-phonon and phonon-phonon coupling in type-II Dirac semi-metal NiTe 2via temperature-dependent Raman spectroscopy. J Phys Condens Matter 2023; 35:125701. [PMID: 36623321 DOI: 10.1088/1361-648x/acb18a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
We report the temperature-dependent structural characterization of type-II Dirac semimetal NiTe2in the form of a bulk single crystal and a nanoflake (200 nm thick). Detailed x-ray diffraction study along with Rietveld refinement analysis reveals superior crystallinity and linear thermal expansion coefficient (αT) of 5.56 × 10-6and 22.5 × 10-6K-1along a or b and c lattice directions, respectively. Temperature evolution of Raman spectra shows non-linear variations in the phonon frequency and full-width half maxima of the out-of-plane A1gand in-plane Egmodes. Raman mode E2g1, corresponding to an in-plane vibration, disappears on decreasing the thickness from bulk to nanoflake. Quantitative analysis with anharmonic model yields dominating electron-phonon interaction over phonon-phonon interaction mediated by three- and four-phonon processes.
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Affiliation(s)
- Minna Theres James
- Department of Physics, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Shoubhik Mandal
- Department of Physics, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Nirmal K Sebastian
- Centre for Nanoscience and Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Pramita Mishra
- Department of Physics, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - R Ganesan
- Department of Physics, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - P S Anil Kumar
- Department of Physics, Indian Institute of Science, Bangalore, Karnataka 560012, India
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Xie D, Wang XT, Wei LJ, Zhang R, Ganesan R, Matthews DTA, Leng YX. Atomic configuration, electronic structure, and work of adhesion of TiN(111)//B2‐NiTi(110) and TiN(111)//B19’‐NiTi(010) interfaces: Insights from first‐principles simulations. SURF INTERFACE ANAL 2022. [DOI: 10.1002/sia.7158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dong Xie
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education of China, School of Physical Science and Technology Southwest Jiaotong University Chengdu China
| | - X. T. Wang
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education of China, School of Physical Science and Technology Southwest Jiaotong University Chengdu China
| | - L. J. Wei
- School of Materials Science and Engineering Southwest Jiaotong University Chengdu China
| | - R. Zhang
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education of China, School of Physical Science and Technology Southwest Jiaotong University Chengdu China
| | - R. Ganesan
- The University of Sydney Sydney NSW Australia
- Department of Nuclear, Plasma, and Radiological Engineering, Center for Plasma‐Material Interactions University of Illinois at Urbana‐Champaign Urbana Illinois USA
| | - D. T. A. Matthews
- Department of Mechanics Solids & Surfaces, Faculty of Engineering Technology University of Twente Enschede the Netherlands
| | - Y. X. Leng
- School of Materials Science and Engineering Southwest Jiaotong University Chengdu China
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Funingana I, Leung E, Alcaraz ML, Bird L, Ang J, Parkinson C, Jimenez-Linan M, Freeman S, Spencer C, Winning J, Ganesan R, Williams S, Ong K, Abedin P, Sundar S, Balega J, Brenton J. 33P The development of infrastructure for mainstream ovarian cancer genetic testing (DEMO). Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.04.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Priyadarshini P, Das S, Alagarasan D, Ganesan R, Varadharajaperumal S, Sahoo S, Naik R. The impact of fluence dependent proton ion irradiation on the structural and optical properties of Bi5In30Se65 thin films for nonlinear optical devices. RSC Adv 2022; 12:5012-5026. [PMID: 35425520 PMCID: PMC8981220 DOI: 10.1039/d2ra00097k] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 01/25/2022] [Indexed: 01/03/2023] Open
Abstract
The influence of 30 keV proton ion irradiation on the surface morphology, surface topography and optical properties of Bi5In30Se65 thin films.
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Affiliation(s)
- P. Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India
| | - S. Das
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India
| | - D. Alagarasan
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - R. Ganesan
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - S. Varadharajaperumal
- Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore-560012, India
| | - S. Sahoo
- Laboratory for Low Dimensional Materials, Institute of Physics, Bhubaneswar 751005, India
- Homi Bhabha Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - R. Naik
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India
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Priyadarshini P, Das S, Alagarasan D, Ganesan R, Varadharajaperumal S, Naik R. Observation of high nonlinearity in Bi doped Bi xIn 35-xSe 65 thin films with annealing. Sci Rep 2021; 11:21518. [PMID: 34728771 PMCID: PMC8563738 DOI: 10.1038/s41598-021-01134-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 10/20/2021] [Indexed: 11/09/2022] Open
Abstract
The present work demonstrates the impact of thermal annealing on the structural, linear, and non-linear optical characteristics of thermally evaporated BixIn35-xSe65 (x = 0, 5, 10, 15 at%) thin films. The prominent crystalline phases have been developed for all annealed films at 450 °C whereas the films remain amorphous at 350 °C annealing. The XRD and Raman analysis showed the phase transformation of Bi-doped films and new Bi2Se3 phases developed upon annealing at 450 °C. The phase transformation induced change increased the linear and nonlinear properties with great extent as seen from the UV-visible optical studies. The direct and indirect optical bandgaps decreased with annealing temperature and also with Bi % content due to the formation of surface dangling bonds near the crystallite sites. The static linear refractive index and high-frequency dielectric constants were increased with annealing. The third-order non-linear susceptibility and non-linear refractive index were found to be greatly influenced by annealing temperature and increased with bismuth content. The FESEM micrographs also showed the phase transformation and EDX analysis showed the composition. The results obtained from the materials showed the potentiality to be useful for photovoltaic and optoelectronic applications.
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Affiliation(s)
- P Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India
| | - Subhashree Das
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - R Ganesan
- Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - S Varadharajaperumal
- Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, 560012, India
| | - Ramakanta Naik
- Department of Engineering and Material Physics, ICT-IOC, Bhubaneswar, 751013, India.
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Yewale RV, Natarajan K, Ubal Dhus J, Parameswaran SA, Ramaswamy Palaniswamy K, Babu Vinish D, Somasundaram A, Ramakrishnan A, Karmegam S, Arun RS, Manmohan US, Mahadevan B, Harri Prasad B, Chandrasekar TS, Gokul BJ, Dutta A, Joseph AJ, Venkatraman J, Ganesh P, Shanmuganathan S, Alagammai PL, Ramasubramanian R, Venkatakrishnan L, Ganesan R, Chandrasekaran Arun A, Srinivas S, Kannan M, Revathy MS, Sathiyasekaran M, Sarangapani A, Rajesh N, Arulselvan V, Aravind A, Premkumar K, Kavitha S, Varadarajulu HV, Manimaran M, Basumani P, Murali A, Ramakrishna BS. Inflammatory bowel diseases in Tamil Nadu: A survey of demographics, clinical profile, and practices. JGH Open 2021; 5:1306-1313. [PMID: 34816017 PMCID: PMC8593807 DOI: 10.1002/jgh3.12673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/11/2021] [Accepted: 10/20/2021] [Indexed: 11/11/2022]
Abstract
BACKGROUND Inflammatory bowel disease (IBD) is increasingly diagnosed in South Asia. This survey by the Tamil Nadu Chapter of the Indian Society of Gastroenterology (TNISG) documents the demography, clinical profile, and therapeutic practices related to IBD in Tamil Nadu. METHODS TNISG members from 32 institutions completed an online cross-sectional questionnaire on IBD patients from March 2020 to January 2021. RESULTS Of 1295 adult IBD patients, 654 had Crohn's disease (CD), 499 ulcerative colitis (UC), and 42 IBD-unclassified (IBD-U). CD and UC showed a unimodal age distribution. A total of 55% were graduates or postgraduates. A positive family history was noted in 30, other risk factors were uncommon. In CD, the pattern of involvement was ileocolonic (42.8%), ileal (34.7%), colonic (18.9%), and upper gastrointestinal (3.5%); while in UC, disease was characterized as extensive (44.9%), left-sided (41.7%), or proctitis (13.4%). Perineal disease, perianal fistulae, and bowel obstruction were noted in 4.3, 14.0, and 23.5%, respectively, of CD. The most widely used drugs were mesalamine, azathioprine, and corticosteroids. Surgery was undertaken in 141 patients with CD and 23 patients with UC. Of the 138 patients with pediatric IBD (≤16 years), 23 were characterized as very early onset IBD (VEO-IBD), 27 as early-onset, and 88 as adolescent IBD. VEO-IBD were more likely to have a positive family history of IBD and were more likely to have perineal disease and to have the IBD-U phenotype. Among pediatric IBD patients, corticosteroids, mesalamine, and azathioprine were the most commonly used medications, while 25 pediatric patients received biologics. CONCLUSION This study provides important information on demography, clinical profile, and treatment practices of IBD in India.
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Srivastava S, Samarpita S, Ganesan R, Rasool M. CYT387 Inhibits the Hyperproliferative Potential of Fibroblast-like Synoviocytes via Modulation of IL-6/JAK1/STAT3 Signaling in Rheumatoid Arthritis. Immunol Invest 2021; 51:1582-1597. [PMID: 34704880 DOI: 10.1080/08820139.2021.1994589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Fibroblast-like synoviocytes (FLS) are the critical effector cells primarily involved in rheumatoid arthritis (RA) disease pathogenesis. Interleukin (IL)-6, a proinflammatory cytokine most abundantly expressed in the rheumatoid synovium, promotes Janus kinase (JAK)/signal transducer and transcriptional activator (STAT) signaling cascade activation in RA-FLS, thus leading to its aggressive phenotype, invasiveness, and joint destruction. Momelotinib (CYT387) is a selective small-molecule inhibitor of JAK1/2 and is clinically approved to treat myelofibrosis. However, the therapeutic efficacy of CYT387 in FLS mediated RA pathogenesis is less known. In the present study, we investigated the modulatory effect of CYT387 on IL6/JAK/STAT signaling cascade in FLS induced RA pathogenesis. CYT387 treatment inhibited IL-6 induced high proliferative and migratory potential of FLS cells isolated from adjuvant-induced arthritic (AA) rats. CYT387 reduced the expression of PRMT5, survivin, and HIF-1α mediated by IL-6/sIL-6R in AA-FLS in a dose-dependent manner. The IL-6/sIL-6R induced expression of angiogenic factors such as VEGF and PIGF in AA-FLS cells was found downregulated by CYT387 treatment. Importantly, CYT387 significantly reduced IL-6/sIL-6R dependent activation of JAK1 and STAT3 and increased SOCS3 expression in AA-FLS cells. Next, the S3I-201 mediated blockade of STAT3 activation supported the inhibitory effect of CYT387 on IL-6/JAK1/STAT3 signaling cascade in AA-FLS. Overall, this study proves that CYT387 inhibits proliferation, migration, and pathogenic disease potential of FLS isolated from adjuvant-induced arthritic (AA) rats via targeting IL-6/JAK1/STAT3 signaling cascade.
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Affiliation(s)
- Susmita Srivastava
- Immunopathology Lab, School of BioSciences and Technology, Vellore Institute of Technology (VIT), Vellore, India
| | - Snigdha Samarpita
- Immunopathology Lab, School of BioSciences and Technology, Vellore Institute of Technology (VIT), Vellore, India
| | - Ramamoorthi Ganesan
- Immunology Program, Department of Clinical Science, H. Lee Moffitt Cancer Center, Tampa, Florida, USA
| | - Mahaboobkhan Rasool
- Immunopathology Lab, School of BioSciences and Technology, Vellore Institute of Technology (VIT), Vellore, India
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15
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Vadivel M, Ganesan R. Design and Development of 3D Brain MRI System Using Deep Neural Networks. j med imaging hlth inform 2021. [DOI: 10.1166/jmihi.2021.3855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A Brain tumor is otherwise known as intracranial tumor. It is a formation of abnormal cells within the brain. A tumor cells grows continuously in the brain and destroys the cells in that specific region causing brain damage. The main problem in the tumor detection is that some normal
brain cells tend to behave as tumor cell which leads to misclassification or unwanted brain surgery. A great challenge for the researchers is to identify the region and appropriate tumor mass. Due to this main reason, automated classifications are acquired for the early detection of brain
tumor. In this research work, two standard datasets were used to test the developed classification algorithms. In this study, four different deep learning models were utilized to identify the accurate fit model to classify the brain tumor. From the results, it was observed that googlenet has
achieved maximum mean classification accuracy of 98.2%, sensitivity 98.67% and specificity 96.17%. Our proposed model can be used to classify the brain tumor more accurately and effectively.
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Affiliation(s)
- M. Vadivel
- Research Scholar, Department of Information Technology, Excel Engineering College, Namakkal 637303, TamilNadu, India
| | - R. Ganesan
- Department of Electrical and Electronics Engineering, E.G.S. Pillay Engineering College, Nagapattinam 611002, TamilNadu, India
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16
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Mathan Gopi A, Ganesan R, Somasundaram K. Automatic Facial Emotional Valence Detection System Modelling Using Crafted Features and Deep Neural Network. j med imaging hlth inform 2021. [DOI: 10.1166/jmihi.2021.3507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This work provides a method that merges handcrafted and automatic feature extraction with deep convolutional neural network (D-CNN) and visualization bagging (VB) to acquire effectual and improved results from traditional facial expression recognition (FER) results. To acquire features,
pre-trained model with D-CNN architecture is experimented with Dense and over sparse network. After extracting merged information, it is imposed over every featured image to protect structural information of all textured image. Therefore, dimensionality reduction of implicit feature extraction
is done with maximal pooling approach. At last, deep CNN is used to recognize class label only for testing images that was trained and classified using soft-max classifier. To validate robustness for recognizing facial expression under complex setup, simulation was performed by merging available
dataset with online dataset. Experimental results demonstrate that anticipated model can acquire recognition rate with training speed on training image is approximately two times faster than that of prevailing model. The anticipated model shows better trade off in comparison with prevailing
models. Simulation is done with MATLAB simulation environment.
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Affiliation(s)
- A. Mathan Gopi
- Computer Science and Engineering, Sri Muthukumaran Institute of Technology, Chakkarayapuram (Near Poonamallee), Near Mangadu, Chennai 600069, Tamil Nadu, India
| | - R. Ganesan
- Electrical and Electronics Engineering, E.G.S. Pillay Engineering College, Thethi Village, Nagore, Nagapattinam 611002, Tamil Nadu, India
| | - K. Somasundaram
- Computer Science and Engineering, Chennai Institute of Technology, Pudupedu Village Kundrathur Sriperumbudur, Kundrathur, Anna University, Chennai 600069, Tamil Nadu, India
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17
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Yap J, Slade D, Goddard H, Dawson C, Ganesan R, Velangi S, Sahu B, Kaur B, Hughes A, Luesley D. Sinecatechins ointment as a potential novel treatment for usual type vulval intraepithelial neoplasia: a single-centre double-blind randomised control study. BJOG 2021; 128:1047-1055. [PMID: 33075197 DOI: 10.1111/1471-0528.16574] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/08/2020] [Indexed: 01/20/2023]
Abstract
OBJECTIVE To compare the safety and efficacy of 10% sinecatechins (Veregen® ) ointment against placebo in the treatment of usual type vulvar intraepithelial neoplasia (uVIN). DESIGN A Phase II double-blind randomised control trial. SETTING A tertiary gynaecological oncology referral centre. POPULATION All women diagnosed with primary and recurrent uVIN. METHODS Eligible patients were randomised 1:1 to receive either sinecatechins or placebo ointment (applied three times daily for 16 weeks) and were followed up at 2, 4, 8, 16, 32 and 52 weeks. MAIN OUTCOME MEASURES The primary outcome measure, recorded at 16 and 32 weeks, was histological response (HR). Secondary outcome measures included clinical (CR) response, toxicity, quality of life and pain scores. RESULTS There was no observed difference in HR between the two arms. However, of the 26 patients who were randomised, all 13 patients who received sinecatechins showed either complete (n = 5) or partial (n = 8) CR, when best CR was evaluated. In placebo group, three patients had complete CR, two had partial CR, six had stable disease and two were lost to follow up. Patients in the sinecatechins group showed a statistically significant improvement in best observed CR as compared with the placebo group (P = 0.002). There was no difference in toxicity reported in either group. CONCLUSION Although we did not observe a difference in HR between the two treatment arms, we found that 10% sinecatechins application is safe and shows promise in inducing clinical resolution of uVIN lesions and symptom improvement, thus warranting further investigation in a larger multicentre study. TWEETABLE ABSTRACT A randomised control study indicating that sinecatechins ointment may be a novel treatment for uVIN.
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Affiliation(s)
- J Yap
- Institute of Cancer and Genomic Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Pan Birmingham Gynaecological Cancer Centre, City Hospital, Birmingham, UK
| | - D Slade
- Cancer Research UK Clinical Trials Unit, University of Birmingham, Birmingham, UK
| | - H Goddard
- Pan Birmingham Gynaecological Cancer Centre, City Hospital, Birmingham, UK
| | - C Dawson
- Department of Microbiology & Infection, Warwick Medical School, University of Warwick, Coventry, UK
| | - R Ganesan
- Department of Histopathology, Birmingham Women's NHS Foundation Trust, Birmingham, UK
| | - S Velangi
- Department of Dermatology, Queen Elizabeth Hospital, Birmingham, UK
| | - B Sahu
- Department of Obstetrics and Gynaecology, The Shrewsbury and Telford Hospital NHS Trust, Shrewsbury, UK
| | - B Kaur
- Cancer Research UK Clinical Trials Unit, University of Birmingham, Birmingham, UK
| | - A Hughes
- Cancer Research UK Clinical Trials Unit, University of Birmingham, Birmingham, UK
| | - D Luesley
- Institute of Cancer and Genomic Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Pan Birmingham Gynaecological Cancer Centre, City Hospital, Birmingham, UK
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18
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Sahoo D, Priyadarshini P, Dandela R, Alagarasan D, Ganesan R, Varadharajaperumal S, Naik R. In situ laser irradiation: the kinetics of the changes in the nonlinear/linear optical parameters of As 50Se 40Sb 10 thin films for photonic applications. RSC Adv 2021; 11:16015-16025. [PMID: 35481185 PMCID: PMC9030252 DOI: 10.1039/d1ra02368c] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 04/25/2021] [Indexed: 11/21/2022] Open
Abstract
The photosensitivity of amorphous chalcogenide thin films brings out light-induced changes in the nonlinear and linear optical parameters upon sub-bandgap and bandgap laser irradiation. The present work reports the in situ laser irradiated changes in the optical properties of As50Se40Sb10 thin films. The thermally evaporated film showed an exponential decrease in optical bandgap and increase in Urbach energy. The decay rate of the bandgap was 6.24 min and growth rate of Urbach energy was 6.67 min respectively. The dynamics of photo-induced changes were observed from the changes in linear refractive index and its dependent parameters such as 3rd order nonlinear susceptibility, nonlinear refractive index, dispersion and dielectric parameters. The conversion of heteropolar to homopolar bonds induced the photodarkening mechanism that changed the dispersion parameters. The decrease in E d and E o reduced the oscillator strength along with the zero-frequency dielectric constant. The optical and electrical conductivity changed significantly with time. The changes were saturated with time which brings stability in the film properties that is useful for various optical applications. However, no structural and compositional changes upon laser irradiation were noticed from the X-ray diffraction and EDX studies respectively. The surface homogeneity was checked from the FESEM picture.
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Affiliation(s)
- D Sahoo
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - P Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - R Dandela
- Department of Industrial & Engineering Chemistry, ICT-IOC Bhubaneswar 751013 India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - R Ganesan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - S Varadharajaperumal
- Centre for Nano Science and Engineering, Indian Institute of Science Bangalore-560012 India
| | - R Naik
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
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19
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Sahoo D, Priyadarshini P, Aparimita A, Alagarasan D, Ganesan R, Varadharajaperumal S, Naik R. Role of annealing temperature on optimizing the linear and nonlinear optical properties of As 40Se 50Ge 10 films. RSC Adv 2020; 10:26675-26685. [PMID: 35515774 PMCID: PMC9055387 DOI: 10.1039/d0ra04763e] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 07/09/2020] [Indexed: 11/21/2022] Open
Abstract
The present work shows the effect of annealing conditions on the linear and nonlinear optical properties of two-year-old thermally evaporated 800 nm As40Se50Ge10 thin films. The aging effect in this film is clearly noticeable as compared with the old observation. The two-year-old films were annealed at different temperatures like 373, 413, 453 and 493 K for 1 h. The optical parameters were calculated from the optical transmittance and reflectance spectra measured at normal incidence of light by spectrometer in the 500-1000 nm range. The linear refractive index (n) and extinction coefficient (k) were decreased with annealing temperature. The observation reveals the increase in optical band gap with increase in annealing temperature while the width of the tail in the gap has an opposite behaviour. The oscillator energy, dispersion energy, dielectric constant, the loss factor, and optical conductivity were discussed in detail. The nonlinear refractive index and optical susceptibility were calculated by using Miller's formula which decreased with annealing temperature. The changes in both linear and nonlinear optical parameters with annealing temperature showed that annealing temperature can be considered as a useful factor for controlling the optical properties of As40Se50Ge10 chalcogenide films which could be the candidate for numerous photonic applications. The structural study was done by X-ray diffraction and Raman spectroscopy.
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Affiliation(s)
- D Sahoo
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - P Priyadarshini
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
| | - A Aparimita
- Department of Physics, Utkal University Bhubaneswar 751004 India
| | - D Alagarasan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - R Ganesan
- Department of Physics, Indian Institute of Science Bangalore 560012 India
| | - S Varadharajaperumal
- Centre for Nano Science and Engineering, Indian Institute of Science Bangalore-560012 India
| | - R Naik
- Department of Engineering and Material Physics, ICT-IOC Bhubaneswar 751013 India
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20
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Samarpita S, Ganesan R, Rasool M. Cyanidin prevents the hyperproliferative potential of fibroblast-like synoviocytes and disease progression via targeting IL-17A cytokine signalling in rheumatoid arthritis. Toxicol Appl Pharmacol 2020; 391:114917. [PMID: 32044269 DOI: 10.1016/j.taap.2020.114917] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 01/31/2020] [Accepted: 02/06/2020] [Indexed: 12/24/2022]
Abstract
The hyperplastic phenotype of fibroblast-like synoviocytes (FLSs) plays an important role for synovitis, chronic inflammation and joint destruction in rheumatoid arthritis (RA). Interleukin 17A (IL-17A), a signature pro-inflammatory cytokine effectively influences the hyperplastic transformation of FLS cells and synovial pannus growth. IL-17A cytokine signalling participates in RA pathology by regulating an array of pro-inflammatory mediators and osteoclastogenesis. Cyanidin, a key flavonoid inhibits IL-17A/IL-17 receptor A (IL-17RA) interaction and alleviates progression and disease severity of psoriasis and asthma. However, the therapeutic efficacy of cyanidin on IL-17A cytokine signalling in RA remains unknown. In the present study, cyanidin inhibited IL-17A induced migratory and proliferative capacity of FLS cells derived from adjuvant-induced arthritis (AA) rats. Cyanidin treatment reduced IL-17A mediated reprogramming of AA-FLS cells to overexpress IL-17RA. In addition, significantly decreased expression of IL-17A dependent cyr61, IL-23, GM-CSF, and TLR3 were observed in AA-FLS cells in response to cyanidin. At the molecular level, cyanidin modulated IL-17/IL-17RA dependent JAK/STAT-3 signalling in AA-FLS cells. Importantly, cyanidin activated PIAS3 protein to suppress STAT-3 specific transcriptional activation in AA-FLS cells. Cyanidin treatment to AA rats attenuated clinical symptoms, synovial pannus growth, immune cell infiltration, and bone erosion. Cyanidin reduced serum level of IL-23 and GM-CSF and expression of Cyr 61 and TLR3 in the synovial tissue of AA rats. Notably, the level of p-STAT-3 protein was significantly decreased in the synovial tissue of AA rats treated with cyanidin. This study provides the first evidence that cyanidin can be used as IL-17/17RA signalling targeting therapeutic drug for the treatment of RA and this need to be investigated in RA patients.
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Affiliation(s)
- Snigdha Samarpita
- Immunopathology Lab, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, Tamil Nadu, India
| | - Ramamoorthi Ganesan
- Immunology Program, Department of Clinical Science, H. Lee Moffitt Cancer Center, Tampa, Florida 33612, United States
| | - Mahaboobkhan Rasool
- Immunopathology Lab, School of Biosciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, Tamil Nadu, India.
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21
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Banerjee A, Sundaresh A, Biswas S, Ganesan R, Sen D, Anil Kumar PS. Topological insulator n-p-n junctions in a magnetic field. Nanoscale 2019; 11:5317-5324. [PMID: 30843549 DOI: 10.1039/c8nr10306b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Electrical transport in three dimensional topological insulators (TIs) occurs through spin-momentum locked topological surface states that enclose an insulating bulk. In the presence of a magnetic field, surface states get quantized into Landau levels giving rise to chiral edge states that are naturally spin-polarized due to spin momentum locking. It has been proposed that p-n junctions of TIs exposed to external magnetic fields can manifest unique spin dependent effects, apart from forming basic building blocks for highly functional spintronic devices. Here, for the first time we study electrostatically defined n-p-n junctions of dual-gated devices of the three dimensional topological insulator BiSbTe1.25Se1.75 in the presence of a strong magnetic field, revealing striking signatures of suppressed or enhanced electrical transport depending upon the chirality of quantum Hall edge states created at the n-p and p-n junction interfaces. Theoretical modeling combining the electrostatics of the dual gated TI n-p-n junction with the Landauer Buttiker formalism for transport through a network of chiral edge states explains our experimental data. Our work not only opens up a route towards exotic spintronic devices but also provides a test bed for investigating the unique signatures of quantum Hall effects in topological insulators.
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Affiliation(s)
- Abhishek Banerjee
- Department of Physics, Indian Institute of Science, Bengaluru 560012, India.
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22
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Banerjee A, Mohapatra A, Ganesan R, Kumar PSA. Restoring Superconductivity in the Quantum Metal Phase of NbSe 2 Using Dissipative Coupling. Nano Lett 2019; 19:1625-1631. [PMID: 30735619 DOI: 10.1021/acs.nanolett.8b04538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Localization arguments forbid the appearance of a metallic ground state in two dimensions. Yet, a large variety of disordered superconductors are known to manifest an anomalous metal phase in the zero temperature limit. While previous observations were confined to noncrystalline "dirty" superconductors, the recent observation of the so-called Bose metal phase in crystalline thin flakes of NbSe2 has sparked off intense debate. While the exact nature of this phase remains unknown, it is thought that quantum fluctuations play a decisive role in Bose metal physics. In this work, we study the response of the anomalous metal phase in thin flakes of NbSe2 to dissipative coupling. We evince a dramatic quenching of the Bose metal phase when dissipative coupling is strong, fully restoring a zero resistance superconducting state in the entire region of the magnetic field (H)-temperature (T) phase diagram where the Bose metal phase is otherwise observed. The suppression of the Bose metal phase by dissipative coupling is possible only in a quantum system where dissipation can directly affect system thermodynamics. Our observation of a dissipative phase transition in two-dimensional NbSe2 firmly establishes the quantum nature of the anomalous metal phase in this class of "clean" superconductors.
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Affiliation(s)
- Abhishek Banerjee
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
| | - Abhinab Mohapatra
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
| | - R Ganesan
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
| | - P S Anil Kumar
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
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23
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Ganesan R, Rasool M. Ferulic acid inhibits interleukin 17-dependent expression of nodal pathogenic mediators in fibroblast-like synoviocytes of rheumatoid arthritis. J Cell Biochem 2019; 120:1878-1893. [PMID: 30160792 DOI: 10.1002/jcb.27502] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 07/20/2018] [Indexed: 01/24/2023]
Abstract
Interleukin 17 (IL-17), a proinflammatory cytokine produced by T helper (Th) 17 cells, potentially controls fibroblast-like synoviocytes (FLS)-mediated disease activity of rheumatoid arthritis (RA) via IL-17/ IL-17 receptor type A (IL-17RA)/signal transducer and activator of transcription 3 (STAT-3) signaling cascade. This has suggested that targeting IL-17 signaling could serve as an important strategy to treat FLS-mediated RA progression. Ferulic acid (FA), a key polyphenol, attenuates the development of gouty arthritis and cancer through its anti-inflammatory effects, but its therapeutic efficiency on IL-17 signaling in FLS-mediated RA pathogenesis remains unknown. In the current study, FA markedly inhibited the IL-17-mediated expression of its specific transmembrane receptor IL-17RA in FLS isolated from adjuvant-induced arthritis (AA) rats. Importantly, FA dramatically suppressed the IL-17-mediated expression of toll-like receptor 3 (TLR-3), cysteine-rich angiogenic inducer 61 (Cyr61), IL-23, granulocyte-macrophage colony stimulating factor (GM-CSF) in AA-FLS via the inhibition of IL-17/IL-17RA/STAT-3 signaling cascade. In addition, FA significantly decreased the formation of osteoclast cells and bone resorption potential in a coculture system consisting of IL-17 treated AA-FLS and rat bone marrow derived monocytes/macrophages. Furthermore, FA remarkably inhibited the IL-17-mediated expression of receptor activator of nuclear factor κ-Β ligand (RANKL) and increased the expression of osteoprotegerin (OPG) in AA-FLS via the regulation of IL-17/IL-17RA/STAT-3 signaling cascade. The therapeutic efficiency of FA on IL-17 signaling was further confirmed by knockdown of IL-17RA using small interfering RNA or blocking of STAT-3 activation with S3I-201. The molecular docking analysis revealed that FA manifests significant ligand efficiency toward IL-17RA, STAT-3, IL-23, and RANKL proteins. This study provides new evidence that FA can be used as a potential therapeutic agent for inhibiting IL-17-mediated disease severity and bone erosion in RA.
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Affiliation(s)
- Ramamoorthi Ganesan
- Immunopathology Lab, School of Bio Sciences and Technology, Vellore Institute of Technology (VIT), Vellore, Tamilnadu, India
| | - Mahaboobkhan Rasool
- Immunopathology Lab, School of Bio Sciences and Technology, Vellore Institute of Technology (VIT), Vellore, Tamilnadu, India
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24
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Ganesan R, Vinodhini SP, Balasubramani V, Parthipan G, Sridhar TM, Arulmozhi R, Muralidharan R. Tuning the band gap of hybrid lead free defect perovskite nano crystals for solar cell applications. NEW J CHEM 2019. [DOI: 10.1039/c9nj03902c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In recent reports, combinations of lead free organic inorganic halide perovskites have shown significant advances in solar cell devices.
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Affiliation(s)
- R. Ganesan
- Department of Physics
- S. A. Engineering College
- Chennai-77
- India
| | - S. P. Vinodhini
- Department of Chemistry
- Veltech Dr Rangarajan & Dr Sakunthala R&D Institute of Science and Technology
- Chennai-62
- India
| | - V. Balasubramani
- Department of Analytical Chemistry
- University of Madras
- Chennai-25
- India
| | - G. Parthipan
- Department of Physics
- Veltech Multi-Tech Dr Rangarajan & Dr Sakunthala Engineering College
- Chennai-62
- India
| | - T. M. Sridhar
- Department of Analytical Chemistry
- University of Madras
- Chennai-25
- India
| | - R. Arulmozhi
- Department of Chemistry
- SRM Institute of Science and Technology
- Kattankulathur-603203
- India
| | - R. Muralidharan
- Department of Physics
- Veltech High-Tech Dr Rangarajan & Dr Sakunthala Engineering College
- Chennai-62
- India
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25
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Aravindan U, Ganesan R, Thamarai Kannan M. Surgery for Blue Rubber Bleb Nevus Syndrome-a Case Report. Indian J Surg 2018; 80:272-274. [PMID: 29973759 DOI: 10.1007/s12262-017-1715-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 12/08/2017] [Indexed: 01/10/2023] Open
Abstract
Blue rubber bleb nevus syndrome (BRBNS) is a rare disease characterised by multiple venous malformations and haemangioma in the skin and visceral organs. The lesion often involves the cutaneous and gastrointestinal tract. Most common visceral organ affected is the GIT. Most predominant region involved in the GIT is small bowel. However, vascular lesions can occur anywhere from oral mucosa to anal canal. GIT bleed is relatively slow, resulting in minor, chronic and occult blood loss. The syndrome in the GIT may also present with severe complications such as rupture, volvulus, intussusceptions and even death. Cutaneous malformations are usually asymptomatic and do not require treatment. The treatment of GIT lesions is determined by the extent of intestinal involvement and severity of the disease. Most patients respond to supportive therapy such as iron supplementation and blood transfusion. Surgical resection, endoscopic sclerosis and laser photocoagulation have been proposed for more significant haemorrhage and severe complications. Here, we present a case of BRBNS in a 13-year-old girl involving the GIT especially the large bowel, presenting with the complaints of bleeding per rectum and iron deficiency anaemia. Initially, endoscopic sclerotherapy was performed, but to no response. Hence, proceeded with surgical resection.
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Affiliation(s)
| | - R Ganesan
- Department of MGE, TMCH, Thanjavur, India
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26
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Doss HM, Samarpita S, Ganesan R, Rasool M. Ferulic acid, a dietary polyphenol suppresses osteoclast differentiation and bone erosion via the inhibition of RANKL dependent NF-κB signalling pathway. Life Sci 2018; 207:284-295. [PMID: 29908722 DOI: 10.1016/j.lfs.2018.06.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 06/11/2018] [Accepted: 06/13/2018] [Indexed: 12/31/2022]
Abstract
AIMS Bone erosion induced by enhanced osteoclast formation is a debilitating pathological phenomenon in rheumatoid arthritis (RA). Recent finding has revealed that ferulic acid is associated with reduced osteoclast differentiation and bone erosion. However, the underlying mechanism through which ferulic acid inhibited osteoclast differentiation and bone erosion still remains to be elucidated. This study assessed the therapeutic effects of ferulic acid on osteoclast differentiation and bone erosion by targeting RANKL dependent NF-κB pathway. MAIN METHODS RAW 264.7 monocyte/macrophage cells were left untreated/treated with 25, 50 and 100 μM ferulic acid prior to stimulation with/without RANKL and M-CSF. Osteoclast differentiation and formation was assessed by SEM and TRAP analysis whereas its functional activity of bone erosion was determined by pit formation assay. Crucial transcription factors (NF-κBp-65, NFATc1 and c-Fos) and osteoclast specific genes (TRAP, MMP-9 and Cathepsin K) were evaluated by quantitative RT-PCR. Further, the protein level expression of NF-κBp-65, NFAtc1, c-Fos and MMP-9 was assessed using western blot analysis. KEY FINDINGS Our results demonstrated that ferulic acid significantly attenuated RANKL induced osteoclast differentiation as evidenced from SEM and TRAP staining analysis. A remarkable decrease in the bone resorption activity of osteoclasts was also noticed upon ferulic acid treatment. In addition, the down-regulation of RANKL induced NF-κB activation and its associated downstream factors like NFATc1, c-Fos, TRAP, Cathepsin K and MMP-9 was also observed upon ferulic acid treatment. SIGNIFICANCE Thus, our findings evidence the anti-stimulatory and anti-resorptive role of ferulic acid via the inhibition of RANKL dependent NF-κB signalling pathway.
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Affiliation(s)
- Hari Madhuri Doss
- Immunopathology Lab, School of Bio Sciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, Tamilnadu, India
| | - Snigdha Samarpita
- Immunopathology Lab, School of Bio Sciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, Tamilnadu, India
| | - Ramamoorthi Ganesan
- Immunopathology Lab, School of Bio Sciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, Tamilnadu, India
| | - Mahaboobkhan Rasool
- Immunopathology Lab, School of Bio Sciences and Technology, Vellore Institute of Technology (VIT), Vellore 632 014, Tamilnadu, India.
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Ganesan R, Sivalingam N. Transforming Growth Factor Beta 2 Inhibits Growth and Proliferation Potential of Smad4 and p53 Mutated Human Colon Adenocarcinoma Cells. Pathol Oncol Res 2018; 25:819-821. [PMID: 29948613 DOI: 10.1007/s12253-018-0423-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 05/28/2018] [Indexed: 12/20/2022]
Affiliation(s)
- Ramamoorthi Ganesan
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu, 603203, India
| | - Nageswaran Sivalingam
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu, 603203, India.
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Santhosh Kumar JU, Krishna V, Seethapathy GS, Ganesan R, Ravikanth G, Shaanker RU. Assessment of adulteration in raw herbal trade of important medicinal plants of India using DNA barcoding. 3 Biotech 2018; 8:135. [PMID: 29479511 DOI: 10.1007/s13205-018-1169-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 02/10/2018] [Indexed: 11/25/2022] Open
Abstract
A number of studies have shown that there could be widespread substitution and/or adulteration (hereafter referred to as substitution) in raw herbal trade of medicinal plants. Substitution could potentially endanger the health and safety of the consumers. In this study, the extent of adulteration in raw herbal trade of 30 important medicinal plants in South India was analyzed. Biological reference material (BRM) consisting of taxonomically authenticated samples of each of the 30 species along with 14 other co-occurring and congeneric allied species that are likely to be used in adulteration was established. DNA barcode signatures of 124 BRM using two candidate regions, nr-ITS and psbA-trnH were identified. A total of 203 herbal trade samples representing the 30 medicinal plant species were collected from 34 locations in South India. Using the DNA barcode sequences of the BRM as reference, the analysis indicated that the substitution ranged from 20 to 100%. Overall, approximately 12% of the market samples were adulterated. Considering the potential health hazard that such adulteration can cause, the need for a national regulatory framework that can authenticate and regulate raw herbal trade in the country is discussed.
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Affiliation(s)
- J U Santhosh Kumar
- 1Department of Post Graduate Studies and Research in Biotechnology, Jnanasahyadri, Kuvempu University, Shankaraghatta, Shimoga, 577451 India
- 2School of Ecology and Conservation, University of Agricultural Sciences, GKVK, Bangalore, 560065 India
- 3Department of Crop Physiology, University of Agricultural Sciences, GKVK, Bangalore, 560065 India
| | - V Krishna
- 1Department of Post Graduate Studies and Research in Biotechnology, Jnanasahyadri, Kuvempu University, Shankaraghatta, Shimoga, 577451 India
| | - G S Seethapathy
- 4Ashoka Trust for Research in Ecology and the Environment, Royal Enclave, Srirampura, Jakkur Post, Bangalore, 560064 India
| | - R Ganesan
- 4Ashoka Trust for Research in Ecology and the Environment, Royal Enclave, Srirampura, Jakkur Post, Bangalore, 560064 India
| | - G Ravikanth
- 4Ashoka Trust for Research in Ecology and the Environment, Royal Enclave, Srirampura, Jakkur Post, Bangalore, 560064 India
| | - R Uma Shaanker
- 2School of Ecology and Conservation, University of Agricultural Sciences, GKVK, Bangalore, 560065 India
- 3Department of Crop Physiology, University of Agricultural Sciences, GKVK, Bangalore, 560065 India
- 4Ashoka Trust for Research in Ecology and the Environment, Royal Enclave, Srirampura, Jakkur Post, Bangalore, 560064 India
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Agarwal A, Kasinathan A, Ganesan R, Balasubramanian A, Bhaskaran J, Suresh S, Srinivasan R, Aravind KB, Sivalingam N. Curcumin induces apoptosis and cell cycle arrest via the activation of reactive oxygen species-independent mitochondrial apoptotic pathway in Smad4 and p53 mutated colon adenocarcinoma HT29 cells. Nutr Res 2018; 51:67-81. [PMID: 29673545 DOI: 10.1016/j.nutres.2017.12.011] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 12/31/2017] [Accepted: 12/31/2017] [Indexed: 11/25/2022]
Abstract
Curcumin is a natural dietary polyphenol compound that has various pharmacological activities such as antiproliferative and cancer-preventive activities on tumor cells. Indeed, the role reactive oxygen species (ROS) generated by curcumin on cell death and cell proliferation inhibition in colon cancer is poorly understood. In the present study, we hypothesized that curcumin-induced ROS may promote apoptosis and cell cycle arrest in colon cancer. To test this hypothesis, the apoptosis-inducing potential and cell cycle inhibition effect of ROS induced by curcumin was investigated in Smd4 and p53 mutated HT-29 colon adenocarcinoma cells. We found that curcumin treatment significantly increased the level of ROS in HT-29 cells in a dose- and time-dependent manner. Furthermore, curcumin treatment markedly decreased the cell viability and proliferation potential of HT-29 cells in a dose- and time-dependent manner. Conversely, generation of ROS and inhibitory effect of curcumin on HT-29 cells were abrogated by N-acetylcysteine treatment. In addition, curcumin treatment did not show any cytotoxic effects on HT-29 cells. Furthermore, curcumin-induced ROS generation caused the DNA fragmentation, chromatin condensation, and cell nuclear shrinkage and significantly increased apoptotic cells in a dose- and time-dependent manner in HT-29 cells. However, pretreatment of N-acetylcysteine inhibited the apoptosis-triggering effect of curcumin-induced ROS in HT-29 cells. In addition, curcumin-induced ROS effectively mediated cell cycle inhibition in HT-29 cells. In conclusion, our data provide the first evidence that curcumin induces ROS independent apoptosis and cell cycle arrest in colon cancer cells that carry mutation on Smad4 and p53.
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Affiliation(s)
- Ayushi Agarwal
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - Akiladdevi Kasinathan
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - Ramamoorthi Ganesan
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - Akhila Balasubramanian
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - Jahnavi Bhaskaran
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - Samyuktha Suresh
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - Revanth Srinivasan
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - K B Aravind
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India
| | - Nageswaran Sivalingam
- Department of Biotechnology, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur-603203, Tamilnadu, India.
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Ganesan R, Rasool M. Interleukin 17 regulates SHP-2 and IL-17RA/STAT-3 dependent Cyr61, IL-23 and GM-CSF expression and RANKL mediated osteoclastogenesis by fibroblast-like synoviocytes in rheumatoid arthritis. Mol Immunol 2017; 91:134-144. [PMID: 28898718 DOI: 10.1016/j.molimm.2017.09.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 08/30/2017] [Accepted: 09/01/2017] [Indexed: 01/08/2023]
Abstract
Interleukin (IL)-17 predominately produced by the Th17 cells, plays a crucial role in the fibroblast-like synoviocytes (FLS) mediated disease process of rheumatoid arthritis (RA). IL-17 exerts its pathogenic effects in RA-FLS by IL-17/IL-17RA/STAT-3 signaling. Recent studies have shown that RA-FLS produces SHP-2, Cyr61, IL-23, GM-CSF and RANKL which results in worsening of the disease. However, whether IL-17/IL-17RA/STAT-3 signaling regulates SHP-2, Cyr61, IL-23, GM-CSF and RANKL expressions in RA-FLS remains unknown. In this study, IL-17 treatment dramatically induced the production of Cyr61, IL-23 and GM-CSF in FLS isolated from adjuvant induced arthritis (AA) rats. Conversely, IL-17 mediated production of Cyr61, IL-23 and GM-CSF was abrogated by knockdown of IL-17RA using a small interfering RNA or blockade of STAT-3 activation with S3I-201 in AA-FLS. Interestingly, IL-17 treatment noticeably increased the expression of IL-17RA and SHP-2 in AA-FLS. However, silencing of IL-17RA reversed the effect of IL-17 on the expression of IL-17RA and SHP-2 in AA-FLS. In addition, an increased number of TRAP-positive multinucleated cells were observed in a coculture system consisting of IL-17 treated AA-FLS and rat bone marrow derived monocytes/macrophages. Further, mechanistically we found that IL-17 upregulated RANKL expression in AA-FLS that was dependent on the IL-17/IL-17RA/STAT-3 signaling cascade. Knockdown of IL-17RA or inhibition of STAT-3 activation decreased the IL- 17 induced RANKL expression by AA-FLS and their osteoclastogenic potential. Taken together, our findings demonstrate that IL-17 regulates SHP-2 expression and IL-17RA/STAT-3 dependent production of Cyr61, IL-23, GM-CSF and RANKL in AA-FLS and may reveal a new insight into the pathogenesis of RA.
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Affiliation(s)
- Ramamoorthi Ganesan
- Immunopathology Lab, School of Bio Sciences and Technology, VIT University, Vellore 632 014, Tamilnadu, India
| | - Mahaboobkhan Rasool
- Immunopathology Lab, School of Bio Sciences and Technology, VIT University, Vellore 632 014, Tamilnadu, India.
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31
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Lohani H, Mishra P, Banerjee A, Majhi K, Ganesan R, Manju U, Topwal D, Kumar PSA, Sekhar BR. Band Structure of Topological Insulator BiSbTe 1.25Se 1.75. Sci Rep 2017; 7:4567. [PMID: 28676658 PMCID: PMC5496864 DOI: 10.1038/s41598-017-04985-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 05/23/2017] [Indexed: 11/09/2022] Open
Abstract
We present our angle resolved photoelectron spectroscopy (ARPES) and density functional theory results on quaternary topological insulator (TI) BiSbTe1.25Se1.75 (BSTS) confirming the non-trivial topology of the surface state bands (SSBs) in this compound. We find that the SSBs, which are are sensitive to the atomic composition of the terminating surface have a partial 3D character. Our detailed study of the band bending (BB) effects shows that in BSTS the Dirac point (DP) shifts by more than two times compared to that in Bi2Se3 to reach the saturation. The stronger BB in BSTS could be due to the difference in screening of the surface charges. From momentum density curves (MDCs) of the ARPES data we obtained an energy dispersion relation showing the warping strength of the Fermi surface in BSTS to be intermediate between those found in Bi2Se3 and Bi2Te3 and also to be tunable by controlling the ratio of chalcogen/pnictogen atoms. Our experiments also reveal that the nature of the BB effects are highly sensitive to the exposure of the fresh surface to various gas species. These findings have important implications in the tuning of DP in TIs for technological applications.
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Affiliation(s)
- H Lohani
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751005, India.,Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400085, India
| | - P Mishra
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751005, India
| | - A Banerjee
- Indian Institute of Science, Bangalore, 560012, India
| | - K Majhi
- Indian Institute of Science, Bangalore, 560012, India
| | - R Ganesan
- Indian Institute of Science, Bangalore, 560012, India
| | - U Manju
- CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, 751005, India
| | - D Topwal
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751005, India.,Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400085, India
| | | | - B R Sekhar
- Institute of Physics, Sachivalaya Marg, Bhubaneswar, 751005, India. .,Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400085, India.
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Bawa KS, Ganesan R. Ecology: Document India's floral biodiversity. Nature 2017. [PMID: 28640267 DOI: 10.1038/546474d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - R Ganesan
- Ashoka Trust for Research in Ecology and the Environment, Bangalore, India
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Abstract
We demonstrate experimentally that a macroscopic topological insulator (TI) phase can emerge in a granular conductor composed of an assembly of tunnel coupled TI nanocrystals of dimension ∼10 nm × 10 nm × 2 nm. Electrical transport measurements on thin films of Bi2Se3 nanocrystals reveal the presence of decoupled top and bottom topological surface states that exhibit large surface state penetration depths (∼30 nm at 2 K). By tuning the size of the nanocrystals and the couplings between them, this new class of TIs may be readily tuned from a non-topological to a topological insulator phase, that too with designer properties. Paradoxically, this seemingly 'dirty' system displays properties that are closer to an ideal TI than most known single crystal systems, making granular/nanocrystalline TIs an attractive platform for future TI research.
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Affiliation(s)
- Abhishek Banerjee
- Department of Physics, Indian Institute of Science, Bengaluru 560 012, India.
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Banerjee A, Rai A, Majhi K, Barman SR, Ganesan R, Anil Kumar PS. Intermediate stages of surface state formation and collapse of topological protection to transport in Bi 2Se 3. J Phys Condens Matter 2017; 29:185001. [PMID: 28350542 DOI: 10.1088/1361-648x/aa666a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Surface states consisting of helical Dirac fermions have been extensively studied in three-dimensional topological insulators. Yet, experiments to date have only investigated fully formed topological surface states (TSS) and it is not known whether preformed or partially formed surface states can exist or what properties they could potentially host. Here, by decorating thin films of Bi2Se3 with nanosized islands of the same material, we show for the first time that not only can surface states exist in various intermediate stages of formation but they exhibit unique properties not accessible in fully formed TSS. These include tunability of the Dirac cone mass, vertical migration of the surface state wave-function and the appearance of mid-gap Rashba-like states as exemplified by our theoretical model for decorated TIs. Our experiments show that an interplay of Rashba and Dirac fermions on the surface leads to an intriguing multi-channel weak anti-localization effect concomitant with an unprecedented tuning of the topological protection to transport. Our work offers a new route to engineer topological surface states involving Dirac-Rashba coupling by nano-scale decoration of TI thin films, at the same time shedding light on the real-space mechanism of surface state formation in general.
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Affiliation(s)
- Abhishek Banerjee
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
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Dasiram JD, Ganesan R, Kannan J, Kotteeswaran V, Sivalingam N. Curcumin inhibits growth potential by G1 cell cycle arrest and induces apoptosis in p53-mutated COLO 320DM human colon adenocarcinoma cells. Biomed Pharmacother 2017; 86:373-380. [DOI: 10.1016/j.biopha.2016.12.034] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/01/2016] [Accepted: 12/08/2016] [Indexed: 02/07/2023] Open
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Ganesan R, Rasool M. Fibroblast-like synoviocytes-dependent effector molecules as a critical mediator for rheumatoid arthritis: Current status and future directions. Int Rev Immunol 2017; 36:20-30. [PMID: 28102734 DOI: 10.1080/08830185.2016.1269175] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Rheumatoid arthritis (RA) is a systemic-autoimmune-mediated disease characterized by synovial hyperplasia and progressive destruction of joint. Currently available biological agents and inhibitor therapy that specifically target tumor necrosis factor-α, interleukin 1β (IL-1β), IL-6, T cells, B cells, and subcellular molecules (p38 mitogen-activated protein kinase and janus kinase) cannot facilitate complete remission in all patients and are unable to cure the disease. Therefore, further potent therapeutic targets need to be identified for effective treatment and successful clinical outcomes in patients with RA. Scientific breakthroughs have brought new insights regarding fibroblast-like synoviocytes (FLS), a major constituent of the synovial hyperplasia. These play a pivotal role in RA invading cartilage and bone tissue. Currently there are no effective therapies available that specifically target these aggressive cells. Recent evidences indicate that FLS-dependent effector molecules (toll-like receptors, nodal effector molecules, hypoxia-inducible factor, and IL-17) have emerged as important mediators of RA. In this review, we discuss the pathological features and recent advances in understanding the role of FLS-dependent effector molecules in the disease onset of RA. Pharmacological inhibition of FLS-dependent effector molecules might be a promising option for FLS-targeted therapy in RA.
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Affiliation(s)
- Ramamoorthi Ganesan
- a Immunopathology Lab, School of Biosciences and Technology, VIT University , Vellore , Tamilnadu , India
| | - Mahaboobkhan Rasool
- a Immunopathology Lab, School of Biosciences and Technology, VIT University , Vellore , Tamilnadu , India
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Herring K, Ganesan R, Rao A, Edwards L, Pascoe J, Williams S. Ovarian granulosa cell tumours: hormone receptor positivity and response to aromatase inhibitors. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw374.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Doss HM, Ganesan R, Rasool M. Trikatu, an herbal compound ameliorates rheumatoid arthritis by the suppression of inflammatory immune responses in rats with adjuvant-induced arthritis and on cultured fibroblast like synoviocytes via the inhibition of the NFκB signaling pathway. Chem Biol Interact 2016; 258:175-86. [DOI: 10.1016/j.cbi.2016.09.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 07/24/2016] [Accepted: 09/05/2016] [Indexed: 12/20/2022]
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Ganesan R, Doss HM, Rasool M. Majoon ushba, a polyherbal compound, suppresses pro-inflammatory mediators and RANKL expression via modulating NFкB and MAPKs signaling pathways in fibroblast-like synoviocytes from adjuvant-induced arthritic rats. Immunol Res 2016; 64:1071-86. [DOI: 10.1007/s12026-016-8794-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Ganesan R, Doss HM, Rasool M. Majoon ushba, a polyherbal compound ameliorates rheumatoid arthritis via regulating inflammatory and bone remodeling markers in rats. Cytokine 2016; 77:115-26. [DOI: 10.1016/j.cyto.2015.11.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 10/20/2015] [Accepted: 11/02/2015] [Indexed: 12/12/2022]
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Santhosh Kumar J, Krishna V, Seethapathy G, Senthilkumar U, Ragupathy S, Ganeshaiah K, Ganesan R, Newmaster SG, Ravikanth G, Uma Shaanker R. DNA barcoding to assess species adulteration in raw drug trade of “Bala” (genus: Sida L.) herbal products in South India. BIOCHEM SYST ECOL 2015. [DOI: 10.1016/j.bse.2015.07.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Prebavathy T, Thanislass J, Dhanammal L, Ganesan R, Mukhopadhy H. Association between SNPs in TLR2 Gene Segment Corresponding to LRR Functional Domain of TLR2 Receptor and Bovine Mastitis. ACTA ACUST UNITED AC 2015. [DOI: 10.3923/ajas.2015.45.56] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ganesan R, Dhanavanthan P, Balasubramanyam D, Kumarasamy P, Kiruthika. Growth modeling and factors affecting growth traits in Madras red Sheep. INDIAN J ANIM RES 2015. [DOI: 10.5958/0976-0555.2015.00004.7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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45
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Ganesan R, Ravi M, Ganavelu G, Karthikeyan G, Justin Paul G, Venkatesan S. Discrepancy in assessment of successful balloon mitral valvatomy (BMV) in patient with AF – Dissocation of LA mean pressure over MVO and mean gradient. Indian Heart J 2014. [DOI: 10.1016/j.ihj.2014.10.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Meads C, Sutton A, Małysiak S, Kowalska M, Zapalska A, Rogozinska E, Baldwin P, Rosenthal A, Ganesan R, Borowiack E, Barton P, Roberts T, Sundar S, Khan K. Sentinel lymph node status in vulval cancer: systematic reviews of test accuracy and decision-analytic model-based economic evaluation. Health Technol Assess 2014; 17:1-216. [PMID: 24331128 DOI: 10.3310/hta17600] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Vulval cancer causes 3-5% of all gynaecological malignancies and requires surgical removal and inguinofemoral lymphadenectomy (IFL). Complications affect > 50% of patients, including groin wound infection, lymphoedema and cellulitis. A sentinel lymph node (SLN) is the first groin node with the highest probability of malignancy. SLN biopsy would be useful if it could accurately identify patients in whom cancer has spread to the groin, without removing all groin nodes. SLNs can be identified by isosulfan blue dye and/or technetium-99 ((99m)Tc) radioactive tracer during lymphoscintigraphy. The blue dye/(99m)Tc procedure only detects SLN, not metastases - this requires histological examination, which can include ultrastaging and staining with conventional haematoxylin and eosin (H&E) or immunohistochemistry. OBJECTIVES To determine the test accuracy and cost-effectiveness of the SLN biopsy with (99m)Tc and/or blue dye compared with IFL or clinical follow-up for test negatives in vulval cancer, through systematic reviews and economic evaluation. DATA SOURCES Standard medical databases, including MEDLINE, EMBASE, Science Citation Index and The Cochrane Library, medical search gateways, reference lists of review articles and included studies were searched to January 2011. METHODS For accuracy and effectiveness, standard methods were used and reported according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Searches were to January 2011, with no language restrictions. Meta-analyses were carried out with Meta-Disc version 1.4 (Javier Zamora, Madrid, Spain) for accuracy; none was appropriate for effectiveness. The economic evaluation from a NHS perspective used a decision-tree model in DATA TreeAge Pro Healthcare 2001 (TreeAge Software, Inc., Williamstown, MA, USA). Six options (blue dye with H&E, blue dye with ultrastaging, (99m)Tc with H&E, (99m)Tc with ultrastaging, blue dye/(99m)Tc with H&E, blue dye/(99m)Tc with ultrastaging) were compared with IFL. Deterministic and probabilistic sensitivity analyses were conducted. RESULTS For accuracy, of the 26 included studies, most evaluated (99m)Tc/blue dye combined. Four studies had clinical follow-up only for test negatives and five had clinical follow-up for all and IFL for test negatives. Numbers with no SLN found were difficult to distinguish from those with negative SLN biopsies. The largest group of 11 studies using (99m)Tc/blue dye, ultrastaging and immunohistochemistry had a pooled sensitivity of 95.6% [95% confidence interval (CI) 91.5% to 98.1%] and a specificity of 100% (95% CI 99.0% to 100%). Mean SLN detection rates were 94.6% for (99m)Tc, 68.7% for blue dye and 97.7% for both. One study measured global health status quality of life (QoL) and found no difference between SLN biopsy and IFL. One patient preference evaluation showed that 66% preferred IFL rather than a 5% false-negative rate from SLN biopsy. For effectiveness, of 14,038 references, one randomised controlled trial, three case-control studies and 13 case series were found. Approximately 50% died from vulval cancer and 50% from other causes during follow-ups. Recurrences were in the ratio of approximately 4 : 2 : 1 vulval, groin and distant, with more recurrences in node-positive patients. No studies reported QoL. For cost per death averted, IFL was less costly and more effective than strategies using SLN biopsy. For morbidity-free survival and long-term morbidity-free survival, (99m)Tc with ultrastaging was most cost-effective. Strategies with blue dye only and H&E only were never cost-effective. The incremental cost-effectiveness ratio for (99m)Tc with ultrastaging compared with IFL was £4300 per case of morbidity-free survival and £7100 per long-term morbidity-free survival. LIMITATIONS The main limitations of this study include the lack of good-quality evidence on accuracy, effectiveness and QoL. A large project such as this takes time to publish, so the most recent studies are not included. CONCLUSIONS A sensitive and specific combined metastatic SLN detection test and information on generic QoL in vulval cancer is urgently required. FUNDING The National Institute for Health Research Health Technology Assessment programme.
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Affiliation(s)
- C Meads
- Centre for Primary Care and Public Health, Barts and The London School of Medicine and Dentistry, Queen Mary University of London Health Economics Research Group (HERG), Brunel University Unit of Health Economics, University of Birmingham Arcana Institute Departments of Gynaecology and Gynaecological Oncology, Addenbrooke's Hospital NHS Trust Department of Gynaecology, Barts Health NHS Trust Pan Birmingham Gynaecological Cancer Centre, Birmingham Women's Hospital NHS Foundation Trust, London Middlesex Birmingham Krakow Cambridge London Birmingham, UK UK UK Poland UK UK UK
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Meads C, Sutton AJ, Rosenthal AN, Małysiak S, Kowalska M, Zapalska A, Rogozińska E, Baldwin P, Ganesan R, Borowiack E, Barton P, Roberts T, Khan K, Sundar S. Sentinel lymph node biopsy in vulval cancer: systematic review and meta-analysis. Br J Cancer 2014; 110:2837-46. [PMID: 24867697 PMCID: PMC4056048 DOI: 10.1038/bjc.2014.205] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 03/19/2014] [Accepted: 03/24/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The purpose of this study was to determine the accuracy of sentinel lymph node (SLN) biopsy with technetium 99 (99mTc) and/or blue dye-enhanced lymphoscintigraphy in vulval cancer. METHODS Sensitive searches of databases were performed upto October 2013. Studies with at least 75% of women with FIGO stage IB or II vulval cancer evaluating SLN biopsy with 99mTc, blue dye or both with reference standard of inguinofemoral lymphadenectomy (IFL) or clinical follow-up were included. Meta-analyses were performed using Meta-Disc version 1.4. RESULTS Of the 2950 references, 29 studies (1779 women) were included; most of them evaluated 99mTc combined with blue dye. Of these, 24 studies reported results for SLN followed by IFL, and 5 reported clinical follow-up only for SLN negatives. Pooling of all studies was inappropriate because of heterogeneity. Mean SLN detection rates were 94.0% for 99mTc, 68.7% for blue dye and 97.7% for both. SLN biopsy had pooled sensitivity of 95% (95% CI 92-98%) with negative predictive value (NPV) of 97.9% in studies using 99mTc/blue dye, ultrastaging and immunohistochemistry with IFL as reference. Pooled sensitivity for SLN with clinical follow-up for SLN-negatives was 91% (85-95%) with NPV 95.6%. Patients undergoing SLN biopsy experienced less morbidity than those undergoing IFL. CONCLUSIONS Sentinel lymph node biopsy using 99mTC, blue dye and ultrastaging with immunohistochemistry is highly accurate when restricted to carefully selected patients, within a rigorous protocol, with close follow-up and where sufficient numbers for learning curve optimisation exist. Patients must make an informed choice between the slightly higher groin recurrence rates of SLN biopsy vs the greater morbidity of IFL.
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Affiliation(s)
- C Meads
- Centre for Primary Care and Public Health, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - A J Sutton
- Unit of Health Economics, University of Birmingham, Birmingham, UK
| | | | | | | | | | - E Rogozińska
- Centre for Primary Care and Public Health, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - P Baldwin
- Addenbrooke's Hospital NHS Trust, Cambridge, UK
| | - R Ganesan
- Pan Birmingham Gynaecological Cancer Centre, City Hospital and School of Cancer Sciences, University of Birmingham, Birmingham B15 2TT, UK
| | | | - P Barton
- Unit of Health Economics, University of Birmingham, Birmingham, UK
| | - T Roberts
- Unit of Health Economics, University of Birmingham, Birmingham, UK
| | - K Khan
- Centre for Primary Care and Public Health, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - S Sundar
- Pan Birmingham Gynaecological Cancer Centre, City Hospital and School of Cancer Sciences, University of Birmingham, Birmingham B15 2TT, UK
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Ganesan R, Dhanavanthan P, Kiruthika C, Kumarasamy P, Balasubramanyam D. Comparative study of linear mixed-effects and artificial neural network models for longitudinal unbalanced growth data of Madras Red sheep. Vet World 2014. [DOI: 10.14202/vetworld.2014.52-58] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Karunakaran K, Marudhupandian D, Ganesan R, Gobinath M. Anamolous course of right common carotid artery in a case of papillary carcinoma thyroid. Indian J Surg 2014; 75:145-6. [PMID: 24426411 DOI: 10.1007/s12262-012-0440-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2010] [Accepted: 03/04/2012] [Indexed: 10/28/2022] Open
Abstract
Anamolous Course of Carotid Artery is one of the rarest of the rare anamoly, we describe one such case of anamolous Course of Right Common Carotid Artery.
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Affiliation(s)
- K Karunakaran
- Department of General Surgery, Madurai Medical College & Government Rajaji Hospital, Madurai, 625 020 Tamil Nadu India
| | - D Marudhupandian
- Department of General Surgery, Madurai Medical College & Government Rajaji Hospital, Madurai, 625 020 Tamil Nadu India
| | - R Ganesan
- Department of General Surgery, Madurai Medical College & Government Rajaji Hospital, Madurai, 625 020 Tamil Nadu India
| | - M Gobinath
- Department of General Surgery, Madurai Medical College & Government Rajaji Hospital, Madurai, 625 020 Tamil Nadu India
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Underwood M, Yap JKW, Elattar A, Ganesan R, Notghi A, Crockett C, Luesley DM. The use of sentinel node sampling in vulval cancer. J OBSTET GYNAECOL 2013; 33:892-7. [DOI: 10.3109/01443615.2013.834301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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