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Singh RK, Singh NL, Mehta M, Chauhan R, Suryanarayana SV, Makwana R, Nayak BK, Naik H, Varmuza J, Katovsky K. Activation cross section for the (n,2n) and (n,p) reactions on 103Rh, 48Ti and 52Cr from reaction threshold up to 25 MeV energy region. Appl Radiat Isot 2023; 200:110949. [PMID: 37582315 DOI: 10.1016/j.apradiso.2023.110949] [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: 02/23/2023] [Revised: 06/25/2023] [Accepted: 07/15/2023] [Indexed: 08/17/2023]
Abstract
Activation and off-line γ-ray spectrometric methods were used to measure the ground and isomeric state (n,2n) reaction cross section for 103Rh at two different neutron energies. The standard 27Al (n,α)24Na reference reaction was used to normalise neutron flux. The proton beam from the 14UD BARC-TIFR Pelletron facility in Mumbai, India, was utilised to create high-energy quasi-monoenergetic neutrons via the 7Li (p,n) reaction. Statistical model calculations including the level density, pre-equilibrium and optical potential model were performed using the TALYS (ver. 1.95) and EMPIRE (ver. 3.2.3) reaction codes. In addition, because of considerable discrepancies in measured data, the literature (n,p) reaction cross section of 52Cr and 48Ti targets were examined theoretically in the present work. The measured cross sections are discussed and compared with the latest evaluated data of the FENDL-3.2b, CENDL-3.2, TENDL-2019, JENDL-5.0, and ENDF/B-VIII.0 libraries, and experimental data based on the EXFOR compilation. The theoretical investigation of the (n,2n) reaction cross section was performed for the ground and isomeric state for the first time from reaction threshold to 25 MeV energies. The experimental data corresponding to the ground, isomeric state and isomeric ratio were reproduced consistently by the theoretical calculations. The present experimental results are good with certain literature data and theoretical values.
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Affiliation(s)
- R K Singh
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara, 390002, India.
| | - N L Singh
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara, 390002, India; Department of Physics, Netaji Subhas University of Technology, Dwarka, Delhi, 110078, India.
| | - Mayur Mehta
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara, 390002, India; Institute for Plasma Research, Gandhinagar, 382428, India
| | - Rakesh Chauhan
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara, 390002, India
| | - S V Suryanarayana
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Rajnikant Makwana
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara, 390002, India
| | - B K Nayak
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai, India
| | - H Naik
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Jan Varmuza
- Department of Electrical Power Engineering, Brno University of Technology, Brno, 61600, Czech Republic
| | - K Katovsky
- Department of Electrical Power Engineering, Brno University of Technology, Brno, 61600, Czech Republic
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Nayak BK, Prabhakar V, Nanda A. Myco-Facilitated Biosynthesis of Nano-Silver From Wasp Nest Fungus, Paecilomyces variotii, and Its Antimicrobial Activity Against MTCC Strains. Front Microbiol 2022; 13:841666. [PMID: 35464920 PMCID: PMC9019660 DOI: 10.3389/fmicb.2022.841666] [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: 12/22/2021] [Accepted: 01/31/2022] [Indexed: 11/29/2022] Open
Abstract
The utility of fungi as stabilizing and reducing agents in the biogenic synthesis of silver nanoparticles is striking due to the production of large quantities of biomolecules of minute toxic residuals. During the current study, sunlight- and dark-assessed silver nanoparticles were synthesized from wasp nest fungus, Paecilomyces variotii, at different pHs. Synthesized silver nanoparticles (AgNPs) at 6 pH were found to be more prominent than at 7 and 8 pHs. AgNPs were within the 20- to 90-nm range and were polygonal and elongated in shape. FTIR spectra of light-mediated AgNPs showed diverse transmittance bands than the silver nanoparticles synthesized in the dark. The synthesized AgNPs were found with diverse antimicrobial activities against pathogenic MTCC bacterial strains, i.e., Staphylococcus aureus, Vibrio parahaemolyticus, Escherichia coli, Shewanella putrefaciens, and fungus, Candida albicans. Aqueous filtrate and filtrate-mediated AgNPs combined with methanol solvent extract of yeast extract manitol broth (YEMB) had more inhibitory effects on all bacteria and Candida albicans. Furthermore, the combined effect of AgNPs and methanol solvent extract from YEMB culture filtrate was found more effective against E. coli, while AgNPs combined with methanol solvent of aqueous filtrate had inhibitory effects on E. coli and Candida albicans.
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Affiliation(s)
- B. K. Nayak
- Department of Botany, Kanchi Mamunivar Government Institute for Post Graduate Studies and Research (Autonomous), Puducherry, India
| | - V. Prabhakar
- Department of Botany, Kanchi Mamunivar Government Institute for Post Graduate Studies and Research (Autonomous), Puducherry, India
| | - Anima Nanda
- Department of Biomedical Engineering, Sathyabama Institute of Science and Technology, Chennai, India
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Singh DK, Nayak BK, Kumar N, Jaiswal B. Efficacy of Ultrasound-Guided Injection of Platelet-Rich Plasma in Triangular Fibrocartilage Complex Tear: A Preliminary Report. Semin Musculoskelet Radiol 2020. [DOI: 10.1055/s-0040-1722491] [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: 10/22/2022]
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Mukherjee S, Vansola V, Parashari S, Makwana R, Singh NL, Suryanarayana SV, Sharma SC, Nayak BK, Naik H. Measurement of 232Th and 238U neutron capture cross-sections in the energy range 5-17 MeV. Appl Radiat Isot 2018; 143:72-78. [PMID: 30390503 DOI: 10.1016/j.apradiso.2018.10.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 05/12/2018] [Revised: 09/06/2018] [Accepted: 10/09/2018] [Indexed: 10/28/2022]
Abstract
The neutron capture cross sections of 232Th and 238U at the average neutron energies of 5.08 ± 0.17, 8.96 ± 0.77, 12.47 ± 0.83, and 16.63 ± 0.95 MeV have been measured by using the activation technique and off-line γ-ray spectroscopy. The 232Th and 238U were irradiated with neutrons produced from the 7Li(p, n) reaction using the proton energies of 7, 11, 15 and 18.8 MeV from the 14UD BARC-TIFR Pelletron facility in Mumbai, India. Detailed covariance analysis was also performed to evaluate the uncertainties in the measured cross-sections. The excitation function of the 232Th(n, γ) and 238U(n, γ) reactions were calculated using the theoretical model code TALYS-1.9. The experimental and theoretical results from the present work were compared with the ENDF/B-VII-1 and JENDL-4.0 nuclear data libraries and were found to be in good agreement.
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Affiliation(s)
- S Mukherjee
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390020, India.
| | - Vibha Vansola
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390020, India
| | - Siddharth Parashari
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390020, India
| | - R Makwana
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390020, India
| | - N L Singh
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390020, India
| | - S V Suryanarayana
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S C Sharma
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - B K Nayak
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - H Naik
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Soni BK, Makwana R, Mukherjee S, Parashari S, Suryanarayana SV, Nayak BK, Naik H, Mehta M. Neutron capture cross-sections for 159Tb isotope in the energy range of 5 to 17 MeV. Appl Radiat Isot 2018; 141:10-14. [PMID: 30144772 DOI: 10.1016/j.apradiso.2018.08.009] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 07/16/2018] [Accepted: 08/10/2018] [Indexed: 11/19/2022]
Abstract
The neutron capture cross-sections have been measured for the 159Tb(n, γ)160Tb reaction at the spectrum average peak neutron energies of 5.08 ± 0.165, 12.47 ± 0.825, and 16.63 ± 0.95 MeV respectively. The experiment has been carried out using the standard neutron activation technique and off-line γ-ray spectrometry. The present measurement has been done for the energies where very few measured results are available in the data library. The results have been compared with ENDF/B-VII.1 and JENDL-4.0 data libraries. The present results have also been supported by theoretical predictions of nuclear model code TALYS 1.9. Detailed covariance analysis was carried out to find the uncertainty and the correlations among the measured cross-sections.
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Affiliation(s)
- B K Soni
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390002, Gujarat, India
| | - Rajnikant Makwana
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390002, Gujarat, India
| | - S Mukherjee
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390002, Gujarat, India.
| | - Siddharth Parashari
- Department of Physics, Faculty of Science, The M. S. University of Baroda, Vadodara 390002, Gujarat, India
| | - S V Suryanarayana
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - B K Nayak
- Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - H Naik
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - M Mehta
- Institute for Plasma Research, Gandhinagar, Gujarat 382428, India
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Gopalakrishna A, Suryanarayana SV, Naik H, Nayak BK, Patil BJ, Devraju S, Upreti RR, Kinhikar R, Deshpande DD, Maletha P, Kamaldeep, Banerjee S, Saxena A. Production of 99Mo and 64Cu in a mixed field of photons and neutrons in a clinical electron linear accelerator. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-6016-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pandey B, Prajapati PM, Jakhar S, Rao CVS, Basu TK, Nayak BK, Saxena A, Suryanarayana SV. Estimate of (n,p) Cross Section for Radionuclide 55Fe Using EMPIRE and TALYS. NUCL SCI ENG 2017. [DOI: 10.13182/nse14-26] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Bhawna Pandey
- Institute for Plasma Research, Fusion Neutronics Laboratory Bhat, Gandhinagar – 382 428, India
| | - P. M. Prajapati
- Institute for Plasma Research, Fusion Neutronics Laboratory Bhat, Gandhinagar – 382 428, India
| | - S. Jakhar
- Institute for Plasma Research, Fusion Neutronics Laboratory Bhat, Gandhinagar – 382 428, India
| | - C. V. S. Rao
- Institute for Plasma Research, Fusion Neutronics Laboratory Bhat, Gandhinagar – 382 428, India
| | - T. K. Basu
- Institute for Plasma Research, Fusion Neutronics Laboratory Bhat, Gandhinagar – 382 428, India
| | - B. K. Nayak
- Bhabha Atomic Research Centre, Nuclear Physics Division Mumbai – 400 085, India
| | - A. Saxena
- Bhabha Atomic Research Centre, Nuclear Physics Division Mumbai – 400 085, India
| | - S. V. Suryanarayana
- Bhabha Atomic Research Centre, Nuclear Physics Division Mumbai – 400 085, India
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Chattopadhyay D, Santra S, Pal A, Kundu A, Nayak BK, Mahata K, Ramachandran K, Tripathi R, Parkar VV, Sodaye S, Sarkar D, Pandey B, Kaur G. Elastic, inelastic and inclusive alpha cross sections in 6Li+ 112Sn system. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611706022] [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: 11/14/2022] Open
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Dubey S, Mukherjee S, Patel D, Gupta YK, Danu LS, Joshi BN, Prajapati GK, Mukhopadhyay S, John BV, Nayak BK, Biswas DC. Energy dependence of optical potential in the near barrier elastic scattering of 11B from 232Th. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158600008] [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: 11/14/2022] Open
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Patel D, Surayanarayana SV, Mukherjee S, Nayak BK, Mirgule ET, Biswas DC, Saxena A, Lubian J. 1 n-transfer reaction using 6Li with heavy mass target. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158600032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Prajapati PM, Pandey B, Rao CVS, Jakhar S, Basu TK, Nayak BK, Suryanarayana SV, Saxena A. Excitation Function of 56Fe( n,α) 53Cr Reaction from Threshold to 20 MeV for Fusion Applications. Fusion Science and Technology 2014. [DOI: 10.13182/fst14-804] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- P. M. Prajapati
- Institute for Plasma Research, Fusion Neutronics Laboratory, Bhat, Gandhinagar – 382 428, India
| | - Bhawna Pandey
- Institute for Plasma Research, Fusion Neutronics Laboratory, Bhat, Gandhinagar – 382 428, India
| | - C. V. S. Rao
- Institute for Plasma Research, Fusion Neutronics Laboratory, Bhat, Gandhinagar – 382 428, India
| | - S. Jakhar
- Institute for Plasma Research, Fusion Neutronics Laboratory, Bhat, Gandhinagar – 382 428, India
| | - T. K. Basu
- Institute for Plasma Research, Fusion Neutronics Laboratory, Bhat, Gandhinagar – 382 428, India
| | - B. K. Nayak
- Bhabha Atomic Research Centre, Nuclear Physics Division, Mumbai – 400 085, India
| | - S. V. Suryanarayana
- Bhabha Atomic Research Centre, Nuclear Physics Division, Mumbai – 400 085, India
| | - A. Saxena
- Bhabha Atomic Research Centre, Nuclear Physics Division, Mumbai – 400 085, India
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Affiliation(s)
- B K Nayak
- Dept of Ophthalmology, P. D. Hinduja National Hospital and Medical Research Centre, Veer Savarkar Marg, Mumbai, Maharashtra, India
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Ayangeakaa AD, Garg U, Anthony MD, Frauendorf S, Matta JT, Nayak BK, Patel D, Chen QB, Zhang SQ, Zhao PW, Qi B, Meng J, Janssens RVF, Carpenter MP, Chiara CJ, Kondev FG, Lauritsen T, Seweryniak D, Zhu S, Ghugre SS, Palit R. Evidence for multiple chiral doublet bands in 133Ce. Phys Rev Lett 2013; 110:172504. [PMID: 23679714 DOI: 10.1103/physrevlett.110.172504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Indexed: 06/02/2023]
Abstract
Two distinct sets of chiral-partner bands have been identified in the nucleus 133Ce. They constitute a multiple chiral doublet, a phenomenon predicted by relativistic mean field (RMF) calculations and observed experimentally here for the first time. The properties of these chiral bands are in good agreement with results of calculations based on a combination of the constrained triaxial RMF theory and the particle-rotor model.
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Affiliation(s)
- A D Ayangeakaa
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Santra S, Parihari A, Singh NL, Nayak BK, Behera BR, Mahata K, Ramachandran K, Singh V, Pal A, Chakrabarti R, Appannababu S, Tripathi R, Sodaye S, Sugathan P, Jhingan A, Prasad E, Golda KS, Patel D, Kailas S. Fission fragment mass and angular distribution in 6,7Li+ 235,238U reactions. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136302016] [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: 11/14/2022] Open
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Nayak BK, Feliers D, Sudarshan S, Friedrichs WE, Day RT, New DD, Fitzgerald JP, Eid A, Denapoli T, Parekh DJ, Gorin Y, Block K. Stabilization of HIF-2α through redox regulation of mTORC2 activation and initiation of mRNA translation. Oncogene 2012; 32:3147-55. [PMID: 22869144 PMCID: PMC3696051 DOI: 10.1038/onc.2012.333] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [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] [Indexed: 01/01/2023]
Abstract
HIF-2alpha plays a critical role in renal tumorigenesis. HIF-2alpha is stabilized in Von Hippel-Lindau (VHL)-deficient renal cell carcinoma through mechanisms that require ongoing mRNA translation. Mammalian target of Rapamycin (mTOR) functions in two distinct complexes, Raptor-associated mTORC1 and Rictor-associated mTORC2. Rictor-associated mTORC2 complex has been linked to maintaining HIF-2alpha protein in the absence of VHL, however the mechanisms remain to be elucidated. Although Raptor-associated mTORC1 is a known key upstream regulator of mRNA translation, initiation and elongation, the role of mTORC2 in regulating mRNA translation, is not clear. Complex assembly of the mRNA cap protein, eIF4E, with activators (eIF4G) and inhibitors (4E-BP1) are rate-limiting determinants of mRNA translation. Our laboratory has previously demonstrated that reactive oxygen species, mediated by p22phox-based Nox oxidases, are enhanced in VHL-deficient cells and play a role in the activation of Akt on S473, a site phosphorylated by the mTORC2 complex. In this study, we examined the role of Rictor-dependent regulation of HIF-2alpha through eIF4E-dependent mRNA translation and examined the effects of p22phox-based Nox oxidases on TORC2 regulation. We demonstrate for the first time that mTORC2 complex stability and activation is redox sensitive and further defined a novel role for p22phox-based Nox oxidases in eIF4E-dependent mRNA translation through mTORC2. Furthermore, we provide the first evidence that silencing of p22phox reduces HIF-2alpha-dependent gene targeting in vitro and tumor formation in vivo. The clinical relevance of these studies is demonstrated.
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Affiliation(s)
- B K Nayak
- Department of Medicine, University of Texas Health Science Center, San Antonio, TX, USA
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Satyanarayana K, Sharma A, Parikh P, Vijayan VK, Sahu DK, Nayak BK, Gulati RK, Parikh MN, Prati PS, Bavdekar SB, Sreehari U, Sahni P. Statement on publishing clinical trials in Indian biomedical journals. J Postgrad Med 2009; 54:78-9. [PMID: 18480516 DOI: 10.4103/0022-3859.40766] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Nayak BK, Jain EK. Comparison of corneal endothelial cell loss during phacoemulsification using continuous anterior chamber infusion versus those using ophthalmic viscosurgical device: randomized controlled trial. Indian J Ophthalmol 2009; 57:99-103. [PMID: 19237781 PMCID: PMC2684437 DOI: 10.4103/0301-4738.45500] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Aim We conducted this study to evaluate and compare corneal endothelial cell loss between phacoemulsification with continuous anterior chamber infusion using anterior chamber maintainer (ACM) and phacoemulsification using ophthalmic viscosurgical device (OVD). Materials and Methods This was a prospective, randomized controlled trial. Fifty eyes of 47 patients of senile cataract undergoing phacoemulsification were included. Patients were randomly allocated into two groups of 25 eyes each. Cataract surgery was performed by phacoemulsification with anterior chamber (AC) continuous infusion with balanced salt solution (BSS) plus and ACM without OVD in Group A, and in Group B, phacoemulsification was performed using OVD with BSS plus. Corneal endothelial cell count and pachymetry were performed preoperatively and postoperatively on day 1, day 7, and day 30. Results The mean increase in pachymetry was 4.86%, 2.94%, and 1.94%, (Group A) and 5.95%, 3.94%, and 0.51%, (Group B) on first, seventh, and 30th postoperative day respectively. The difference between the percentage increase in pachymetry between the two groups was not significant at day 1 (P = 0.441), day 7 (P = 0.298), and day 30 (P = 0.174) postoperatively. The density of endothelial cells decreased postoperatively (day 30) by 7.38% (Group A) and 7.47% (Group B) without any significant statistical difference (P = 0.983) between two groups. Conclusion Use of ACM for continuous AC infusion and omission of OVD during phacoemulsification did not cause significant difference in corneal swelling or endothelial cell loss in the immediate postoperative period up to one month.
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Affiliation(s)
- B K Nayak
- Ophthalmology Department, P.D. Hinduja National Hospital and MRC, Veer Savarkar Marg, Mumbai - 400 016, India.
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Nayak BK. Author′s misconduct inviting risk: Duplicate publication. Indian J Ophthalmol 2009; 57:417-8. [PMID: 19861740 PMCID: PMC2812757 DOI: 10.4103/0301-4738.57142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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21
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Satyanarayana K, Sharma A, Parikh P, Vijayan VK, Sahu DK, Nayak BK, Gulati RK, Parikh MN, Singh PP, Bavdekar SB, Sreehari U, Sahni P. Statement on publishing clinical trials in Indian biomedical journals. Indian J Cancer 2008; 45:39-40. [PMID: 18626145 DOI: 10.4103/0019-509x.41767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Li T, Garg U, Liu Y, Marks R, Nayak BK, Rao PVM, Fujiwara M, Hashimoto H, Kawase K, Nakanishi K, Okumura S, Yosoi M, Itoh M, Ichikawa M, Matsuo R, Terazono T, Uchida M, Kawabata T, Akimune H, Iwao Y, Murakami T, Sakaguchi H, Terashima S, Yasuda Y, Zenihiro J, Harakeh MN. Isotopic dependence of the giant monopole resonance in the even-A 112-124Sn isotopes and the asymmetry term in nuclear incompressibility. Phys Rev Lett 2007; 99:162503. [PMID: 17995244 DOI: 10.1103/physrevlett.99.162503] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2007] [Indexed: 05/25/2023]
Abstract
The strength distributions of the giant monopole resonance (GMR) have been measured in the even-A Sn isotopes (A=112-124) with inelastic scattering of 400-MeV alpha particles in the angular range 0 degrees -8.5 degrees . We find that the experimentally observed GMR energies of the Sn isotopes are lower than the values predicted by theoretical calculations that reproduce the GMR energies in 208Pb and 90Zr very well. From the GMR data, a value of Ktau = -550 +/- 100 MeV is obtained for the asymmetry term in the nuclear incompressibility.
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Affiliation(s)
- T Li
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Natarajan M, Nayak BK, Galindo C, Mathur SP, Roldan FN, Meltz ML. Nuclear translocation and DNA-binding activity of NFKB (NF-kappaB) after exposure of human monocytes to pulsed ultra-wideband electromagnetic fields (1 kV/cm) fails to transactivate kappaB-dependent gene expression. Radiat Res 2006; 165:645-54. [PMID: 16802864 DOI: 10.1667/rr3564.1] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The objective of this study was to investigate whether exposure of human monocytes to a pulsed ultra-wideband electromagnetic field (EMF) of 1 kV/cm average peak power triggers a signaling pathway responsible for the transcriptional regulation of NFKB (NF-kappaB)-dependent gene expression. Human Mono Mac 6 (MM6) cells were exposed intermittently to EMF pulses for a total of 90 min. The pulse width was 0.79+/-0.01 ns and the pulse repetition rate was 250 pps. The temperature of the medium was maintained at 37 degrees C in both sham- and EMF-exposed flasks. Total NFKB DNA-binding activity was measured in the nuclear extracts by the electrophoretic mobility shift assay. Cells exposed to the EMFs and incubated for 24 h postexposure showed a 3.5+/-0.2-fold increase in the NFKB DNA-binding activity. Since activation of NFKB was observed, the possibility of kappaB-dependent gene expression in response to exposure to the EMFs was investigated using NFKB signal-specific gene arrays. The results revealed no difference in the NFKB-dependent gene expression profiles at 8 or 24 h postexposure, indicating that activated NFKB does not lead to the differential expression of kappaB-dependent target genes. To determine whether the absence of the kappaB-dependent gene expression was due to compromised transcriptional regulation of NFKB, the functional activity of NFKB was examined in cells transiently transfected with Mercury Pathway constructs containing 4x NFKB binding sites associated either with the luciferase reporter system or a control vector. Pulsed EMF exposure did not induce NFKB-driven luciferase activity in these cells, indicating that the activation of NFKB at 24 h after the 1 kV/cm EMF exposure is functionally inactive. From these results, it is clear that the EMF-induced NFKB activation is only a transient response, with minimal or no downstream effect.
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Affiliation(s)
- M Natarajan
- Department of Radiation Oncology, University of Texas Health Science Center, Brooks City-Base, San Antonio, TX 78229-3900, USA.
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Zhu S, Garg U, Nayak BK, Ghugre SS, Pattabiraman NS, Fossan DB, Koike T, Starosta K, Vaman C, Janssens RVF, Chakrawarthy RS, Whitehead M, Macchiavelli AO, Frauendorf S. A composite chiral pair of rotational bands in the odd-A nucleus 135Nd. Phys Rev Lett 2003; 91:132501. [PMID: 14525299 DOI: 10.1103/physrevlett.91.132501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2003] [Revised: 05/14/2003] [Indexed: 05/24/2023]
Abstract
High-spin states in 135Nd were populated with the 110Pd(30Si,5n)135Nd reaction at a 30Si bombarding energy of 133 MeV. Two DeltaI=1 bands with close excitation energies and the same parity were observed. These bands are directly linked by DeltaI=1 and DeltaI=2 transitions. The chiral nature of these two bands is confirmed by comparison with three-dimensional tilted axis cranking calculations. This is the first observation of a three-quasiparticle chiral structure and establishes the primarily geometric nature of this phenomenon.
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Affiliation(s)
- S Zhu
- Physics Department, University of Notre Dame, Notre Dame, Indiana 46556, USA
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26
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Pyle MC, García A, Tatar E, Cox J, Nayak BK, Triambak S, Laughman B, Komives A, Lamm LO, Rolon JE, Finnessy T, Knutson LD, Voytas PA. Revalidation of the isobaric multiplet mass equation. Phys Rev Lett 2002; 88:122501. [PMID: 11909451 DOI: 10.1103/physrevlett.88.122501] [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] [Received: 12/12/2001] [Indexed: 05/23/2023]
Abstract
We have determined the energy of the J(pi) = 1/2(+), T = 3/2 resonance in 32S(p,p) to be E(p) = 3374.7+/-0.8 keV. This disagrees with the previously accepted value of E(p) = 3370+/-1 keV by Abbondanno et al. [Nuovo Cimento 70A, 391 (1970)] and solves a problem raised by recent observations of unexpected deviations from the isobaric multiplet mass equation. This resonance is also important in calibrating the beta-delayed proton spectra from 33Ar and 32Ar, and our findings may modify previous conclusions.
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Affiliation(s)
- M C Pyle
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Abstract
Different transcription factors activate and repress the p53 gene expression. Recently, a tissue specific binding of NF1/YY1 to p53 promoter has been reported and further, it has been demonstrated that NF1/YY1 activates p53 promoter activity. The deregulated expression of p53 appears to be a central feature of malignant transformation and the basis of this deregulation is not well defined. Hence, an attempt has been made to know the binding of NF1/YY1 to p53 promoter taking breast tumour as a model system. Results have indicated a differential binding of NF1 to p53 promoter and a depletion or low level of NF1 in majority of breast tumour samples. Further, a correlation between NF1 and p53 has indicated the presence of p53 RNA even without NF1. Hence it is assumed that p53 expression is not NF1-dependent in breast tumours. However, the results clearly demonstrate a deregulation of NF1 transcription factor in breast tumours.
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Affiliation(s)
- B K Nayak
- Molecular Biology Division, Institute of Life Sciences, Bhubaneswar, India
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28
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Abstract
Few reports are available on mutations in the promoter of tumour suppressor genes like p16, WT1 and Rb in cancers. However, the involvement of p53 promoter in cancers is not clearly known. Further, methylation of CpG sites is a major contributor of mutations in several genes. So an attempt has been made to determine the mutation and methylation status of p53 promoter in breast tumours. Results have demonstrated absence of mutations and deletions in p53 promoter, leading us to conclude that mutation of p53 promoter is probably not a significant factor in breast tumorigenesis. Methylation analysis has shown that the CCGG sites in the p53 promoter are unmethylated unlike that of its exons. Further, it has been shown that there is no change in the methylation profile of the CCGG sites in breast tumours. However, such studies are to be conducted in different types of tumours to define the role of p53 promoter mutation and methylation in the process of tumorigenesis.
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Affiliation(s)
- B K Nayak
- Molecular Biology Division, Institute of Life Sciences, Bhubaneswar, India
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29
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Abstract
Different postreplicative, transcriptional, and translational mechanisms responsible for p53 gene inactivation are slowly unfolding. Rearrangement of the p53 gene is a very rare event in human solid tumors and has been reported only in osteosarcomas. From our laboratory we have recently reported rearrangement only in the coding region of the p53 gene in breast tumors. In this report we have undertaken a systemic investigation of p53 in oral tumors. Results have shown rearrangement in the coding region of p53 in 20% of cases and in the 5' region of p53 gene in approximately 8% of cases. No allelic loss and amplification of p53 gene was observed in these tumor samples. In our earlier studies on breast tumors, we found no abnormality in the 5' region of p53. However, in the present study we report for the first time rearrangement in the 5' region of p53 in oral tumors. Correlation of p53 gene rearrangement with p53 expression of RNA and protein indicates that rearrangement in the 5' region of p53 might not have a role in p53 expression. However, rearrangement in the coding region of p53 might play a critical role in controlling p53 gene activity in the process of tumorigenesis.
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Affiliation(s)
- S Patnaik
- Molecular Biology Division, Institute of Life Sciences, Bhubaneswar, India
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30
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Abstract
Rearrangement of the p53 gene is frequent in virus transformed cell lines and in chronic myelogenous leukemia. It is a rare event in solid tumours and has been reported only in osteosarcomas. In this study we have examined rearrangement of the p53 gene in human breast tumours. We found rearrangement in 35% of the patients (7 of 20 tumours examined). Normal tissue from these patients had an unrearranged gene, indicating that the genetic abnormality in the tumour is acquired during the natural process of tumorigenesis. No intronic rearrangement or allelic loss of the p53 gene was found in the breast tumour samples studied. Further, rearrangement of the p53 gene has been correlated with the p53 transcriptional status. Only two patients with rearranged p53 showed a high level of p53 RNA as well as protein expression. Thus, for the first time we report the rearrangement of the p53 gene in breast tumours, which may play a role in the process of tumorigenesis.
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Affiliation(s)
- B K Nayak
- Molecular Biology Division, Institute of Life Sciences, Bhubaneswar, India
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31
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Abstract
It is well established that TP53 regulates the expression of many genes, but the regulation of expression of TP53 itself is poorly understood. Recently, it has been shown that there is a tissue-specific binding of nuclear proteins in the TP53 gene promoter. The aim of this study was to determine the nuclear proteins that bind to the TP53 promoter elements (between -104 and -458) in male breast cancer. The results of our study, using the electrophoretic mobility shift assay (EMSA) and Southwestern analysis, have showed: (1) nuclear proteins or factors other than p53 bind to the TP53 promoter; (2) the levels of at least four nuclear proteins vary between normal and tumour breast tissue; and (3) two newly discovered nuclear proteins bind to the TP53 promoter in tumour tissue but are absent in normal tissue. This differential binding of nuclear proteins to the TP53 gene promoter might play a critical role in TP53 transcription and cancer progression in male breast tumours.
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Affiliation(s)
- B K Nayak
- Molecular Biology Division, Institute of Life Sciences, Orissa, India
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Chakrabarty DR, Datar VM, Choudhury RK, Nayak BK, Agarwal YK, Baba CV, Sharan MK. Study of nuclear shapes in Tl isotopes via excited state giant dipole resonance studies in the reaction 16O+181Ta. Phys Rev C Nucl Phys 1996; 53:2739-2748. [PMID: 9971260 DOI: 10.1103/physrevc.53.2739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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33
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Nayak BK, Choudhury RK, Pant LM, Nadkarni DM, Kapoor SS. Fusion l distribution in 16O, 28Si+115In reactions at near- and sub-barrier energies. Phys Rev C Nucl Phys 1995; 52:3081-3087. [PMID: 9970856 DOI: 10.1103/physrevc.52.3081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Nayak BK, Ahmed Z. Comment on "Intermittency in quark-gluon-plasma phase transition". Phys Rev Lett 1995; 75:2448. [PMID: 10059309 DOI: 10.1103/physrevlett.75.2448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Varma R, Mehta GK, Choudhury RK, Kapoor SS, Nayak BK, Ramamurthy VS. Prompt gamma-ray multiplicity distributions in spontaneous fission of 252Cf. Phys Rev C Nucl Phys 1991; 43:1850-1854. [PMID: 9967235 DOI: 10.1103/physrevc.43.1850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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36
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Kailas S, Navin A, Chatterjee A, Singh P, Choudhury RK, Saxena A, Nadkarni DM, Kapoor SS, Ramamurthy VS, Nayak BK, Suryanarayana SV. Fission fragment angular distributions for the system 19F+232Th. Phys Rev C Nucl Phys 1991; 43:1466-1468. [PMID: 9967188 DOI: 10.1103/physrevc.43.1466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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37
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Ramamurthy VS, Kapoor SS, Choudhury RK, Saxena A, Nadkarni DM, Mohanty AK, Nayak BK, Sastry SV, Kailas S, Chatterjee A, Singh P, Navin A. Entrance-channel dependence of fission-fragment anisotropies: A direct experimental signature of fission before equilibration. Phys Rev Lett 1990; 65:25-28. [PMID: 10042163 DOI: 10.1103/physrevlett.65.25] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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38
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Azad RV, Nayak BK, Sharma YR, Tiwari HK, Khosla PK. Risk factor profile in retinal detachment. Indian J Ophthalmol 1988; 36:131-4. [PMID: 3255703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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Abstract
A procedure is described for the ophthalmoscopic examination of the fundus in children after 1% or 2% oral fluorescein ingestion without sedation or anaesthesia. No major complications or any allergic reactions were observed. In the ophthalmoscopically normal fundi of the five healthy children studied the fluorescence of the nerve head and retinal blood vessels could be visualised at 15 minutes, increasing at 30 minutes, and declining by 60 minutes. The possible problems of the technique are discussed.
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Affiliation(s)
- B K Nayak
- Paediatric Ophthalmology Service, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All-India Institute of Medical Sciences, New Delhi
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Abstract
Nine eyes of suspected papilloedema, 21 with incipient papilloedema, and 16 with pseudopapilloedema in 23 children aged 1 month to 10 years were examined after oral fluorescein. In pseudopapilloedema the retinal vascular fluorescence and slight disc head fluorescence with sharp margins at 30 minutes markedly declined by 60 minutes. These features were similar to our earlier findings with oral fluorescein in the normal fundi of children. Of the 30 eyes with suspected or incipient papilloedema late disc and peripapillary 'staining', polar or diffuse was observed in 12, the 60 minutes fluorescence being more than at 30 minutes in nine and of equal in intensity in three. In these 12 'positive' eyes, and four more of the 18 'negative' eyes, the retinal vascular fluorescence at 60 minutes was significantly more than at 30 minutes. The problems of interpretation after oral fluorescein in the early diagnosis of papilloedema in children and the possible fallacies are discussed.
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Affiliation(s)
- S Ghose
- Paediatric Ophthalmology Service, Dr Rajendra Prasad Centre for Ophthalmic Sciences, All-India Institute of Medical Sciences, New Delhi
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41
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Abstract
The manifest refractions of 37 high myopic and 16 high hypermetropic eyes in a total of 28 patients, aged 5 to 42 years, were determined on the Nikon NR-1000F Auto Refractometer. The data obtained were compared with the final clinical prescriptions for these eyes and analysed for degree of agreement for the spherical equivalents, sphere components, and cylinder powers and axes. The Auto Refractometer recordings for all the different refractive components were observed to skew towards more minus in the high myopic eyes but more plus in the high hypermetropes. The possible significance of these skewing patterns is discussed with reference to our earlier studies.
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Affiliation(s)
- B K Nayak
- Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi
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42
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Nayak BK, Kishore K, Gupta SK. Evaluation of oxymetazoline and naphazoline in benign red eyes: a double blind comparative clinical trial. Indian J Ophthalmol 1987; 35:190-3. [PMID: 3333648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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43
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Nayak BK, Ghose S, Singh JP. A comparison of cycloplegic and manifest refractions on the NR-1000F (an objective Auto Refractometer). Br J Ophthalmol 1987; 71:73-5. [PMID: 3814575 PMCID: PMC1041088 DOI: 10.1136/bjo.71.1.73] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The manifest (dry) and cycloplegic refractions of 50 eyes of 25 patients aged 8 to 28 years were studied on the Nikon Auto Refractometer NR-1000F (AR) and compared with the results of clinical refraction (CR) under homatropine and the final clinical acceptance on postmydriatic testing. Only patients in the younger age groups with low to moderate refractive errors were included in this study; high myopes and hypermetropes and patients with aphakia and mixed astigmatism were excluded. The degree of agreement for spherical equivalents, sphere components, and cylinder components was analysed separately for both cycloplegic and manifest refractions on the AR and CR. The results showed that the fixation target in the NR-1000F induces significant instrument myopia during manifest refraction in the younger patients with lower refractive errors. We recommend that caution should be exercised in interpreting manifest refractions on the AR, especially in younger patients. A cycloplegic automatic refraction would be acceptably accurate.
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Abstract
The manifest (dry) refractions of 165 eyes of 86 patients, aged 6 to 75 years, were studied on the Nikon Auto Refractometer NR-1000F. The results obtained were compared with the clinical refractive data, and they were analysed for degree of agreement of various refractive components in different types and grades of refractive errors in the separate age groups. On the NR-1000F the spherical and cylindrical components and spherical equivalents skewed towards more minus (or less plus), especially so in emmetropes, low hypermetropes, and low myopes. This error declined with increasing age over 40 years and was also significantly lower in aphakia and mixed astigmatism. Determination of cylinder axis was found to be reliable on the NR-1000F. In spite of the obvious utility of the device its inbuilt automatic fogging system does not seem adequately to neutralise the patient's accommodative efforts, as the fixation target probably induces instrument myopia.
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45
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Azad R, Nayak BK, Tewari HK, Khosla PK. Oral fluorescein angiography. Indian J Ophthalmol 1984; 32:415-7. [PMID: 6545332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
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46
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Nayak BK, Menon V, Prakash P. Acquired double depressor palsy. Indian J Ophthalmol 1983; 31:77-8. [PMID: 6662574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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47
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Prakash P, Nayak BK, Menon V. Abnormal insertion of inferior oblique. Indian J Ophthalmol 1983; 31:21-2. [PMID: 6629446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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48
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Khosla PK, Nayak BK, Prakash P, Ratnakar KS. Effect of hyperosmotic agent (mannitol) on ciliary epithelium. Indian J Ophthalmol 1981; 29:29-34. [PMID: 6793512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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49
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50
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