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Singh DK, Shankar D, Yadav K, Kaif M. Rete middle cerebral artery presenting with a ruptured aneurysm. J Postgrad Med 2024; 70:109-112. [PMID: 37787263 DOI: 10.4103/jpgm.jpgm_152_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 06/13/2023] [Indexed: 10/04/2023] Open
Abstract
ABSTRACT The developmental anomaly of the middle cerebral artery (MCA) is a rare occurrence. Rete MCA, also known as "unfused," "twig-like," and aplastic MCA, is an even rarer anomaly. These immature rete vessels are prone to flow-related aneurysms which rupture themselves presenting with intraparenchymal hematoma. We here with present a case of rete MCA with a ruptured aneurysm and discuss its pathophysiology and management.
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Affiliation(s)
- D K Singh
- Department of Neurosurgery, Dr Ram Manohar Lohia Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
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2
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Kithan HM, Tyagi V, Singh N, Bhakhri BK, Singh DK. Clinical and antimicrobial susceptibility profile of typhoid fever in children in the era of antibiotic resistance. Trop Doct 2024; 54:112-115. [PMID: 38073124 DOI: 10.1177/00494755231217317] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Enteric fever remains a significant public health problem in low- and middle-income countries with further challenges from emerging antimicrobial resistance. Our prospective study evaluated the current clinical and antimicrobial susceptibility profile of enteric fever in 88 children and compared it to previously established literature. Enteric fever usually presents with nonspecific signs and symptoms, with predominant respiratory complaints. A paradigm shift in the antimicrobial sensitivity pattern has been noted, with increasing resistance for first-line antibiotics and older antibiotics such as ampicillin, cotrimoxazole, and chloramphenicol showing good sensitivity. Thus, the introduction of the latter merits consideration.
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Affiliation(s)
- Hachumlo M Kithan
- Junior Resident, Department of Pediatrics, Post Graduate Institute of Child Health (affiliated to Atal Bihari Bajpai Medical University, Lucknow), Noida, UP, India
| | - Vernika Tyagi
- Assistant Professor, Department of Pediatrics, Post Graduate Institute of Child Health (affiliated to Atal Bihari Bajpai Medical University, Lucknow), Noida, UP, India
| | - Nupur Singh
- Ex. Senior Resident, Department of Pediatrics, Post Graduate Institute of Child Health (affiliated to Atal Bihari Bajpai Medical University, Lucknow), Noida, UP, India
| | - Bhanu Kiran Bhakhri
- Additional Professor, Department of Pediatrics, Post Graduate Institute of Child Health (affiliated to Atal Bihari Bajpai Medical University, Lucknow), Noida, UP, India
| | - Dharmendra Kumar Singh
- Professor and Head, Department of Pediatrics, Post Graduate Institute of Child Health (affiliated to Atal Bihari Bajpai Medical University, Lucknow), Noida, UP, India
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3
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Pant AD, Ruhela R, Pilllai AS, Singh DK, Tomar BS. Rapid and reliable assaying of Tc-99 in sediment samples with novel MTPN polymeric resin. J Environ Radioact 2023; 270:107297. [PMID: 37738760 DOI: 10.1016/j.jenvrad.2023.107297] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 09/04/2023] [Accepted: 09/15/2023] [Indexed: 09/24/2023]
Abstract
The paper describes a new method for the rapid determination of Technetium (Tc) in sediment samples using solid-phase extraction chromatography (SPEC) with a novel methyl triphenyl phosphoniumnitrate (MTPN) resin. The effectiveness of the resin in selectively recovering Tc was evaluated in both batch and column mode and exploited for rapid analysis of 'Tc'. The procedure involves the acid digestion of samples, pre-concentration of fission products in supernatant and co-precipitation of actinides with Fe(OH)3, followed by selective recovery of Tc by SPEC using a column filled with MTPN resin. The recovered Tc was then radiometrically assayed using beta counting. The method was validated using IAEA certified reference materials and was found to provide reliable and reproducible results for the activity concentration of Tc-99 in sediment samples within 24 h.
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Affiliation(s)
- Amar D Pant
- Environmental Monitoring and Assessment Division, India; Homi Bhabha National Institute, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
| | - R Ruhela
- Material Processing and Corrosion Engineering Division, India; Homi Bhabha National Institute, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
| | | | - D K Singh
- Material Processing and Corrosion Engineering Division, India
| | - B S Tomar
- Homi Bhabha National Institute, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
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4
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Kumar N, Chandan SK, Jalan D, Sinha S, Jaiswal B, Singh DK. Ultrasound-guided interventions in primary carpal tunnel syndrome: perineural injection to thread carpal tunnel release. Br J Radiol 2023; 96:20230552. [PMID: 37660684 PMCID: PMC10546448 DOI: 10.1259/bjr.20230552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/12/2023] [Accepted: 08/09/2023] [Indexed: 09/05/2023] Open
Abstract
Carpal tunnel syndrome (CTS), the most common entrapment neuropathy, is compression of the median nerve deep to transverse carpal ligament at wrist. Ultrasonography and electrophysiological study are complementary in the diagnosis and grading of CTS in appropriate clinical settings. The initial management of patients with CTS is conservative with medical therapy and splinting. However, surgical interventions are indicated in patients in whom medical management has failed. With evolution of the concept of safe zone on ultrasonography and identification of the sonoanatomical landmarks of carpal tunnel in greater detail, Ultrasonography-guided interventions are safer and preferred over surgical management in CTS. The primary ultrasonography-guided interventions include perineural injection, perineural hydrodissection and ultrasonography-guided release of transverse carpal ligament. This review article presents the principles of ultrasonography-guided perineural injection, perineural hydrodissection in CTS, the merits and demerits of injectant used in perineural injection/ hydrodissection, and percutaneous ultrasonography-guided thread release of transverse carpal ligament utilizing the concept of safe zone of the ultrasonography-guided interventions for CTS.
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Affiliation(s)
- Nishith Kumar
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Shishir Kumar Chandan
- Department of Neurology, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Divesh Jalan
- Central Institute of Orthopaedics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Skand Sinha
- Sports Injury Centre, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Binita Jaiswal
- Department of Anaesthesia and Critical Care, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Dharmendra Kumar Singh
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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5
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Guo J, Ghosh P, Hill D, Chen Y, Stingaciu L, Zolnierczuk P, Ullrich CA, Singh DK. Persistent dynamic magnetic state in artificial honeycomb spin ice. Nat Commun 2023; 14:5212. [PMID: 37626129 PMCID: PMC10457338 DOI: 10.1038/s41467-023-41003-4] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 08/18/2023] [Indexed: 08/27/2023] Open
Abstract
Topological magnetic charges, arising due to the non-vanishing magnetic flux on spin ice vertices, serve as the origin of magnetic monopoles that traverse the underlying lattice effortlessly. Unlike spin ice materials of atomic origin, the dynamic state in artificial honeycomb spin ice is conventionally described in terms of finite size domain wall kinetics that require magnetic field or current application. Contrary to this common understanding, here we show that a thermally tunable artificial permalloy honeycomb lattice exhibits a perpetual dynamic state due to self-propelled magnetic charge defect relaxation in the absence of any external tuning agent. Quantitative investigation of magnetic charge defect dynamics using neutron spin echo spectroscopy reveals sub-ns relaxation times that are comparable to the relaxation of monopoles in bulk spin ices. Most importantly, the kinetic process remains unabated at low temperature where thermal fluctuation is negligible. This suggests that dynamic phenomena in honeycomb spin ice are mediated by quasi-particle type entities, also confirmed by dynamic Monte-Carlo simulations that replicate the kinetic behavior. Our research unveils a macroscopic magnetic particle that shares many known traits of quantum particles, namely magnetic monopole and magnon.
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Affiliation(s)
- J Guo
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA
| | - P Ghosh
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA
| | - D Hill
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA
| | - Y Chen
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, China
| | - L Stingaciu
- Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - P Zolnierczuk
- Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - C A Ullrich
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA.
| | - D K Singh
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA.
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6
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Gupta P, Tyagi V, Bhakhri BK, Singh DK. Multiple Splenic Abscesses in an Immunocompetent Host. Indian J Pediatr 2023; 90:845. [PMID: 37127824 DOI: 10.1007/s12098-023-04626-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 04/17/2023] [Indexed: 05/03/2023]
Affiliation(s)
- Prafful Gupta
- Department of Pediatrics, Post Graduate Institute of Child Health, Atal Bihari Vajpayee Medical University, Lucknow, Uttar Pradesh, India
| | - Vernika Tyagi
- Department of Pediatrics, Post Graduate Institute of Child Health, Atal Bihari Vajpayee Medical University, Lucknow, Uttar Pradesh, India.
| | - Bhanu Kiran Bhakhri
- Department of Pediatrics, Post Graduate Institute of Child Health, Atal Bihari Vajpayee Medical University, Lucknow, Uttar Pradesh, India
| | - Dharmendra Kumar Singh
- Department of Pediatrics, Post Graduate Institute of Child Health, Atal Bihari Vajpayee Medical University, Lucknow, Uttar Pradesh, India
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7
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Jatav MS, Sarangi A, Singh DK, Sahoo RN, Varghese C. Advanced machine learning-based kharif maize evapotranspiration estimation in semi-arid climate. Water Sci Technol 2023; 88:991-1014. [PMID: 37651334 PMCID: wst_2023_253 DOI: 10.2166/wst.2023.253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Accurate Crop Evapotranspiration (ETc) estimation is crucial for understanding hydrological and agrometeorological processes, yet it's challenged by multiple parameters, data variations, and lack of continuity. These limitations restrict numerical methods application. To address this, the study aims to develop and assess ML models for daily maize ETc in semi-arid areas, utilizing varied weather inputs. Five ML models viz., Category Boosting (CB), Linear Regression (LR), Support Vector Machine (SVM), Artificial Neural Network (ANN), and Stochastic Gradient Descent (SGD) were developed and validated for the ICAR-IARI, New Delhi, Research Station. Penman-Monteith (PM) model estimated ETc values are used as the standard for comparing the performance of the ML model values. Results revealed that the SVM model achieved the highest coefficient of determination (R2) among all models, with a value of 0.987. Furthermore, the SVM model exhibited the lowest model errors (MAE = 0.121 mm day-1, RMSE = 0.172 mm day-1, and MAPE = 4.37%) compared to other models. The ANN model also demonstrated promising results, comparable to the SVM model. Notably, the wind speed parameter was found most influential input parameter. In conclusion, SVM or ANN could be considered reliable alternative methods for the accurate estimation of kharif maize crop ETc in the semi-arid climate.
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Affiliation(s)
- Malkhan Singh Jatav
- Division of Agricultural Engineering, ICAR-IARI, New Delhi 110012, India E-mail:
| | - A Sarangi
- Division of Agricultural Engineering, ICAR-IARI, New Delhi 110012, India
| | - D K Singh
- Division of Agricultural Engineering, ICAR-IARI, New Delhi 110012, India
| | - R N Sahoo
- Division of Agricultural Physics, ICAR-IARI, New Delhi 110012, India
| | - Cini Varghese
- Division of Agricultural Statistics, ICAR-IASRI, New Delhi 110012, India
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8
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Singh DK, Mukund A. Tissue Diagnosis in Infective Spondylodiscitis by CT-Guided Spinal Biopsy: A Standard Practice before Starting Treatment. Indian J Radiol Imaging 2023; 33:287-288. [PMID: 37362364 PMCID: PMC10289847 DOI: 10.1055/s-0043-1770345] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023] Open
Affiliation(s)
- Dharmendra Kumar Singh
- Department of Radiodiagnosis and Interventional Radiology, Vardhaman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Amar Mukund
- Department of Interventional Radiology, Institute of Liver and Biliary Sciences, New Delhi, India
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9
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Ghosh P, Guo J, Ye F, Heitmann T, Kelley S, Ernst A, Dugaev V, Singh DK. NiSi: New Venue for Antiferromagnetic Spintronics. Adv Mater 2023:e2302120. [PMID: 37080560 DOI: 10.1002/adma.202302120] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/02/2023] [Indexed: 05/03/2023]
Abstract
Envisaging antiferromagnetic spintronics pivots on two key criteria of high transition temperature and tuning of underlying magnetic order using straightforward application of magnetic field or electric current. Here, we show that NiSi metal can provide suitable new platform in this quest. First, our study unveils high temperature antiferromagnetism in single crystal NiSi with TN ⩾ 700 K. Antiferromagnetic order in NiSi is accompanied by the non-centrosymmetric magnetic character with small ferromagnetic component in a-c plane. Second, we find that NiSi manifests distinct magnetic and electronic hysteresis responses to field applications due to the disparity in two moment directions. While magnetic hysteresis is characterized by one-step switching between ferromagnetic states of uncompensated moment, electronic behavior is ascribed to metamagnetic switching phenomena between non-collinear spin configurations. Importantly, the switching behaviors persist to high temperature. The properties underscore the importance of NiSi in the pursuit of antiferromagnetic spintronics. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- P Ghosh
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA
| | - J Guo
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA
| | - F Ye
- Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - T Heitmann
- University of Missouri Research Reactor, Columbia, MO, USA
| | - S Kelley
- Department of Chemistry, University of Missouri, Columbia, MO, USA
| | - A Ernst
- Institut for Theoretical Physics, Johannes Kepler University, Linz, Austria
| | - V Dugaev
- Department of Physics and Medical Engineering, Rzeszów University of Technology, Rzeszów, Poland
| | - D K Singh
- Department of Physics and Astronomy, University of Missouri, Columbia, MO, USA
- MU Materials Science and Engineering Institute, Columbia, MO, USA
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10
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Guo J, Sarikhani A, Ghosh P, Heitmann T, Hor YS, Singh DK. Chemically induced ferromagnetism near room temperature in single crystal (Zn 1-x Cr x )Te half-metal. RSC Adv 2023; 13:8551-8556. [PMID: 36936828 PMCID: PMC10015435 DOI: 10.1039/d2ra08105a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 03/04/2023] [Indexed: 03/17/2023] Open
Abstract
Magnetic semiconductors are at the core of recent spintronics research endeavors. Chemically doped II-VI diluted magnetic semiconductors, such as (Zn1-x Cr x )Te, provide a promising platform in this quest. However, a detailed knowledge of the microscopic nature of magnetic ground state is necessary for any practical application. Here, we report on the synergistic study of (Zn1-x Cr x )Te single crystals using elastic neutron scattering measurements and density functional calculations. For the first time, our research unveils the intrinsic properties of ferromagnetic state in a macroscopic specimen of (Zn0.8Cr0.2)Te. The ferromagnetism is onset at T C ∼ 290 K and remains somewhat independent to modest change in the substitution coefficient x. We show that magnetic moments on Zn/Cr sites develop ferromagnetic correlation in the a-c plane with a large ordered moment of μ = 3.08 μ B. Magnetic moment across the lattice is induced via the mediation of Te sites, uncoupled to the number of dopant carriers as inferred from the density functional calculation. Additionally, the ab initio calculations also reveal half-metallicity in x = 0.2 composition. These properties are highly desirable for future spintronic applications.
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Affiliation(s)
- J Guo
- Department of Physics and Astronomy, University of Missouri Columbia MO USA
| | - A Sarikhani
- Department of Physics, Missouri University of Science and Technology Rolla MO USA
| | - P Ghosh
- Department of Physics and Astronomy, University of Missouri Columbia MO USA
| | - T Heitmann
- University of Missouri Research Reactor Columbia MO USA
| | - Y S Hor
- Department of Physics, Missouri University of Science and Technology Rolla MO USA
| | - D K Singh
- Department of Physics and Astronomy, University of Missouri Columbia MO USA
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Singh DK, Kumar N, Bhayana A, Altamash M, Sharma A, Agarwal A. A pentavalent approach for the evaluation of traumatic brachial plexopathy on MRI: correlation of macropattern and micropattern. Br J Radiol 2023; 96:20220913. [PMID: 36752595 DOI: 10.1259/bjr.20220913] [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: 02/09/2023] Open
Abstract
Macropattern analysis of traumatic brachial plexopathy (TBP) by Magnetic Resonance Imaging (MRI) encompasses localization of injured segments and determination of the severity of injury. The micropattern analysis implies the correlation of the MRI features of TBP with Sunderland's grading of the nerve injury, thereby guiding the management protocol. This review article presents a simplified novel pentavalent approach for the radiological anatomy of brachial plexus, MRI acquisition protocol for the evaluation of brachial plexus, cardinal imaging signs of TBP, and their correlation with Sunderland's microanatomical grading.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Nishith Kumar
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Aanchal Bhayana
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Mohd Altamash
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Anuradha Sharma
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Anuj Agarwal
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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12
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Waghaye AM, Singh DK, Sarangi A, Sena DR, Sahoo RN, Sarkar SK. Identification of suitable zones and sites for rainwater harvesting using GIS and multicriteria decision analysis. Environ Monit Assess 2023; 195:279. [PMID: 36609939 DOI: 10.1007/s10661-022-10801-6] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Identifying suitable zones for surface water storage and groundwater recharge is needed to enhance irrigation water availability. This study was undertaken to map rainwater harvesting (RWH) potential zones using geospatial tools and analytic hierarchy process (AHP). The suitable locations for RWH were also mapped using the Boolean logic concept. The surface runoff is a vital factor to demarcate the appropriate zones for RWH. The curve number approach was used to estimate the surface runoff potential. The runoff coefficient (RC) map was generated based on rainfall and surface runoff depth. Weights have been allocated to selected themes of RC, drainage density, and slope. The themes were integrated using geographic information system (GIS) and AHP to demarcate the suitable zones for RWH. The derived RWH potential map was categorized into zones like "very good," "good," "moderate," "poor," and "very poor" with an aerial extent of 14.3%, 24.7%, 28.3%, 20.2%, and 12.6%, respectively. The area suitable for farm ponds was found to be about 9% (408 km2), 13% (329 km2), and 4% (244 km2) in Mirzapur, Chandauli, and Sonbhadra districts, respectively. Furthermore, 22, 15, and 21 locations were found suitable for check dams in Mirzapur, Chandauli, and Sonbhadra districts, respectively. At a large scale, effective planning of water management strategies based on multicriteria decision analysis and GIS offers increased availability of surface and groundwater resources and may help for enhancing the agricultural land use options. The higher resolution maps may be further utilized to plan RWH strategies at village level.
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Affiliation(s)
- A M Waghaye
- ICAR-Indian Agricultural Research Institute, New Delhi, India.
| | - D K Singh
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - A Sarangi
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - D R Sena
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - R N Sahoo
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - S K Sarkar
- ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
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13
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Kumar PS, Gupta SK, Singh DK, Raina S. Study to Determine Role of Fungus in Cases of Chronic Rhinosinusitis with or without Nasal Polyps in Indian Population. BJOHNS 2022. [DOI: 10.47210/bjohns.2022.v30i1.683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
Introduction
Chronic rhinosinusitis (CRS) with or without nasal polyps is a significant public health burden worldwide and owing to its multifactorial etiology, it is often encountered across various medical and surgical specialities. Role of fungus in etiology of CRS has been debated for decades altogether and there is plethora of researches on cellular, molecular and biochemical aspects of fungal presence in nasal cavity and paranasal sinuses and how it affects. Although, there is denial at large on fungal effects on development of CRS, but the question, that whether concomitant and demonstrable presence of fungus in cases of CRS aggravates classic symptoms and signs, largely remains unanswered.
Material and Methods
This cohort study includes 121 subjects, which were divided in CRS without nasal polyps (CRSsNP) and CRS with nasal polyps (CRSwNP) on basis of rigid nasal endoscopic findings. Severity of disease symptoms, among these groups was corelated with Lund – Mackay (LM) symptom scores and extent of disease with LM endoscopic staging scores and LM radiology scores. Histopathology samples for demonstrating presence of fungus were taken and cohort was further subdivided into Fungi positive CRS and Fungi negative CRS, and, LM scores were compared.
Results
In fungi positive CRS group, mean LM symptoms score was 7.09 with standard deviation (SD) ±1.07; mean LM endoscopy score was 6.64 with SD ±1.94 and LM radiological score was 14.58 with SD ±2.96. In Fungi negative group, mean LM symptoms score was 3.58 with
SD ±1.30; mean LM endoscopy score was 4.47 with SD ±1.57 and LM radiological score was 12.20 with SD ±2.98.
Conclusion
Results of this study were statistically significant that fungi positive group was found to have more severe symptoms and larger extent of disease as compared to fungi negative group which indicate that fungal presence may have a role in escalation of symptoms, signs and radiological scores and it may aggravate pre-existing CRS.
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14
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Singh DK, Kishore N. Geoelectrical Sounding to Identify Sub-surface and Groundwater State at Village Banauli, Singrauli District, Madhya Pradesh, India. Nat Env Poll Tech 2022. [DOI: 10.46488/nept.2022.v21i04.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Electrical resistivity (Geoelectrical) methods are well-known and common techniques for investigating the groundwater potential zone. These methods are economically viable and have the highest resolving power compared with other geophysical methods. A total of fifteen Vertical electrical soundings were conducted in the village of Banauli, located in Singrauli district in Madhya Pradesh, India. Vertical electrical sounding was carried out using Schlumberger electrode configuration with the maximum current electrode (AB) spacing of 200 m and potential electrode (MN) spacing of 10 m. For interpretation of measured resistivity, the Partial curve matching technique was used to calculate the layer parameters (resistivity and thickness) and further depict the depth section of the profile. In this study, the maximum five-layer model is obtained, and most curves are of HAK types. The first layer has a mean resistivity value of 12.41 Ωm and a mean thickness of 0.94 m. The second layer has mean resistivity of 7.93 Ωm and a mean thickness of 4.79 m. The third layer has a mean thickness value of 10.55 m and a mean resistivity value of 16.54 Ωm. The fourth layer has a mean resistivity value of 20.17 Ωm and a mean thickness of 9.20 m, and finally, the fifth layer, the bedrock, has a higher mean resistivity value of 59.92 Ωm. Thus, the obtained results may be used for identifying the drilling site for the groundwater potential zone.
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15
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Rai R, Singh DK, Bhakhri BK. Hypothyroxinemia in sick term neonates and its risk factors in an extramural neonatal intensive care unit: a prospective cohort study. Arch Endocrinol Metab 2022; 66:466-471. [PMID: 35657132 PMCID: PMC10697644 DOI: 10.20945/2359-3997000000500] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 04/25/2022] [Indexed: 06/15/2023]
Abstract
Objective Thyroid functions in the sick newborns may be altered in the first week of life. Transient hypothyroxinemia has been reported in these babies, which could be due to the immaturity of the hypothalamic-pituitary-thyroid axis or to acute illness. We conducted this study to estimate the incidence of hypothyroxinemia and determine its risk factors in sick term newborns. Materials and methods We analyzed free T4 (FT4) and thyroid-stimulating hormone (TSH) levels in sick term neonates (≤7 days of life) admitted to the neonatal intensive care unit. FT4 and TSH levels were estimated in the first week of life in all the enrolled neonates (N = 98) and then repeated at 14-21 days of life in 46 babies. Risk analysis was conducted using univariate and multivariate logistic regression, and numerical data was compared using the Mann-Whitney U test and t-test. Results Hypothyroxinemia was seen in 10 (10.2%) of the admitted term babies. Male gender, vaginal delivery, presence of hypoxic ischemic encephalopathy, and need for mechanical ventilation (>24 hours) were identified as risk factors. There was a significant negative linear correlation between FT4 level in the first week of life and duration of hospital stay. Conclusion Hypothyroxinemia is common in sick term neonates.
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Affiliation(s)
- Ruchi Rai
- Department of Neonatology (Maternal Reproductive Health), Super Speciality Pediatric Hospital and Postgraduate Teaching Institute, Noida, UP, India,
| | - D K Singh
- Department of Pediatrics, Super Speciality Pediatric Hospital and Postgraduate Teaching Institute, Noida, UP, India
| | - Bhanu Kiran Bhakhri
- Department of Pediatrics, Super Speciality Pediatric Hospital and Postgraduate Teaching Institute, Noida, UP, India
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16
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Rajani H, Singh DK, Suman S, Katyan A, Sharma A, Kumar N. Two Sides of the Same Coin: Tendoligamentous Similarities and Dissimilarities of Great Toe and Thumb Anatomy on MRI. Indian J Radiol Imaging 2022; 32:113-123. [PMID: 35722646 PMCID: PMC9200492 DOI: 10.1055/s-0042-1743114] [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] [Indexed: 11/14/2022] Open
Abstract
Evolution and functional necessities have compelled the great toe of the foot and its embryological kin, thumb, to have some tendoligamentous differences with a similar basic anatomical structure. This provides biomechanical advantage to these joints: the thumb is apposable and more mobile, ensuring hand dexterity and tool-handling, whereas the great toe is less mobile and more stable, ensuring weight bearing, strength, and stability for bipedal locomotion. This pictorial review will methodically illustrate the similarities and dissimilarities of the joint morphology and its tendoligamentous attachments at the level of carpometacarpal joint, metacarpophalangeal joint, and interphalangeal joints of thumb compared with tarsometatarsal joint, metatarsophalangeal joint, and interphalangeal joints of great toe. It intends to provide a comprehensive understanding of the normal anatomy of great toe and thumb to the radiologists, enabling better interpretation of the pathologies.
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Affiliation(s)
- Heena Rajani
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Dharmendra Kumar Singh
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Saurabh Suman
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Amit Katyan
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Anuradha Sharma
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Nishith Kumar
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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17
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Singh DK, Kumar N, Rustagi A, Jalan D, Krishna LG, Sharma A. Percutaneous CT-guided radiofrequency ablation of osteoid osteoma: Potential Pitfalls and complications and how to avoid them. J Clin Orthop Trauma 2022; 28:101869. [PMID: 35494487 PMCID: PMC9043674 DOI: 10.1016/j.jcot.2022.101869] [Citation(s) in RCA: 1] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 03/13/2022] [Accepted: 04/13/2022] [Indexed: 10/18/2022] Open
Abstract
Targeted cannulation of the nidus and subsequent thermal ablation is the basis of CT-guided radiofrequency ablation (RFA) of osteoid osteoma, which is considered nowadays as the treatment of choice. The majority of complications during this procedure are due to thermal injury of adjacent structures. Specific measures as per the anatomical location of osteoid osteoma can avoid the majority of complications. This article enlists the possible complications and their necessary precautions and remedies to avoid these complications during CT-guided radiofrequency ablation of osteoid osteoma.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Nishith Kumar
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Ashish Rustagi
- Central Institute of Orthopaedics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Divesh Jalan
- Central Institute of Orthopaedics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Loveneesh G. Krishna
- Central Institute of Orthopaedics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Anuradha Sharma
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India,Corresponding author. Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India.
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18
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Pathania V, Guglani V, Azad C, Jain S, Kaur R, Singh DK. Disability and Mortality in Convulsive Status Epilepticus in Children at 3 Months' Follow-Up: A Prospective Study from India. J Neurosci Rural Pract 2022; 13:211-217. [PMID: 35694062 PMCID: PMC9187372 DOI: 10.1055/s-0042-1743212] [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: 11/13/2022] Open
Abstract
Background
Convulsive status epilepticus (CSE) is a common neurological emergency with high mortality, morbidity, and poor quality of life. There is a paucity of follow-up studies from developing nations in pediatric age group.
Objectives
This article looks for clinico-etiological profile of CSE and estimates the immediate and short-term mortality in children with CSE and its predictive factors.
Methodology
This prospective longitudinal study was done at a tertiary care institute of Northern India. The patients between the ages of 1 and 16 years with CSE were enrolled after informed consent, they were observed in the hospital, and survived patients were followed till 3 months after discharge.
Results
A total of 200 patients (58% males) were enrolled. Acute symptomatic (63.5%) was the most common etiology. Twenty-five (12.5%) patients died during hospital stay; at discharge, 160 (80%) had good recovery and rest had a varying range of disability. The predictive factors for poor outcome were female gender, duration of CSE > 1 hour at presentation, generalized seizures, Glasgow Coma Scale < 8 at presentation, refractory status epilepticus, need for critical care support, and acute symptomatic etiology. On follow-up, two patients died at 1-month and one at 3-month follow-up, the cause of death was probably seizures in two patients and feed aspiration in one patient. Seven patients deteriorated from good recovery scoring to moderate disability during the time interval between first and second follow-up, none of them reported apparent repeat seizures.
Conclusion
Pediatric CSE is associated with immediate poor outcome; risk of death and new disabilities persist after discharge thus proper follow-up is essential.
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Affiliation(s)
- Vansha Pathania
- Department of Paediatrics, Government Medical College and Hospital, Chandigarh, India
| | - Vishal Guglani
- Department of Paediatrics, Government Medical College and Hospital, Chandigarh, India
| | - Chandrika Azad
- Department of Paediatrics, Government Medical College and Hospital, Chandigarh, India
| | - Suksham Jain
- Department of Neonatology, Government Medical College and Hospital, Chandigarh, India
| | - Ravinder Kaur
- Department of Radiodiagnosis, Government Medical College and Hospital, Chandigarh, India
| | - Dharmendra Kumar Singh
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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19
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Reghunath A, Singh DK, Aggarwal A, Babbar N, Choudhary R, Surya S. MRI and MR Arthrography Imaging of the Pathologies of the Wrist: A Pictorial Essay. J Clin Diagn Res 2022. [DOI: 10.7860/jcdr/2022/59277.17323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Magnetic Resonance Imaging (MRI) has a special advantage over radiographs and Computed Tomography (CT) in evaluating an anatomically complex structure like wrist, owing to its excellent soft-tissue resolution and multiplanar imaging functionality. MR arthrography further improves the diagnostic value of MRI by virtue of its meticulous depiction of even small tears involving the Triangular Fibrocartilage Complex (TFCC), intrinsic and extrinsic ligaments of the wrist. This article focuses on the MRI and MR arthrography illustration of various traumatic as well as non traumatic pathologies affecting the wrist region and is mainly intended to educate the residents by comprehensively reviewing the imaging features of the major afflictions of this complex joint in a systematic fashion using checklists.
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20
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Yadav MS, Singh VK, Singh DK. Efficacy of Gentamicin versus Chlorhexidine as a Sole Prophylactic Oral Decontaminant in Reducing the Incidence of Ventilator Associated Pneumonia: A Randomised Clinical Study. J Clin Diagn Res 2022. [DOI: 10.7860/jcdr/2022/58684.17095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Introduction: Ventilator Associated Pneumonia (VAP) is the second most common nosocomial infection. Aspiration of bacteria from the upper digestive tract is important in the pathogenesis of this infection. Oral decontamination using antiseptic like chlorhexidine reduces the incidence of VAP but not mortality. There is conflicting results about oral decontamination with antibiotics in preventing VAP, some suggesting benefit and others showing no benefit. Aim: To use two different prophylactic oral decontaminant, gentamicin and chlorhexidine, to compare the incidence of VAP, prevalence of bacterial flora, duration of Intensive Care Unit (ICU) stay, and mortality. Materials and Methods: The present study was a randomised, clinical study conducted at Sir Sunder Lal Hospital, Banaras Hindu University, Varanasi, Uttar Pradesh, India from January 2017 to December 2018. Patients intubated within 24 hours of admission and who needed mechanical ventilation with an expected duration of more than 48 hours were included. All the adult patients between age group 18-50 years were included in study. Patients were randomised to receive either Topical Antimicrobial Prophylaxis (TAP) with 2% gentamicin (Group G) or to 2% chlorhexidine (Group C). Patients were followed until extubation or death. Sequential cultures from endotracheal tube were sent on days 3,7,14, and 21, and for oropharyngeal swab culture were sent on days 0, 3,7,14 and 21. VAP was diagnosed with the help of Clinical Pulmonary Infection Score (CPIS). Results: Out of 151 patients, 82 patients were placed in group G (2% gentamicin) and 69 in group C (2% chlorhexidine). On follow-up of various interval among both the groups, CPIS increased with ICU stay but incidence of VAP was comparable between the groups (50% vs 71%, p=0.009). Pseudomonas was found to be most prevalent bacteria among both the groups. Discharge rate from ICU was higher in group G (54.9%) than group C (52.2%) (p-value=0.744). The mortality rate was higher in the group C (43.9%) than group G (44.9%) (p-value=0.744). Conclusion: Prophylactic oral-decontamination with gentamicin or chlorhexidine does not reduce incidence of VAP and outcome among ICU patients. Gentamicin could be a better option for patients on ventilator because it may lead to less colonisation of Pseudomonas in oral cavity along with lower CPIS in the later stages of VAP.
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21
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Thounaojam N, Sanjenbam N, Pal S, Singh DK, Kumar K, Shah M. The Efficacy of Commercially Available Herbal Dentifrices in Comparison with Conventional Dentifrices against Two Common Oral Microbes: An In vitro Study. J Pharm Bioallied Sci 2021; 13:S176-S179. [PMID: 34447069 PMCID: PMC8375841 DOI: 10.4103/jpbs.jpbs_635_20] [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: 10/02/2020] [Revised: 10/03/2020] [Accepted: 10/04/2020] [Indexed: 11/04/2022] Open
Abstract
Background: Mechanical plaque removal is considered the gold standard for controlling and prevention of plaque and gingivitis. The present study was conducted to evaluate the efficacy of commercially available herbal dentifrices in comparison with conventional dentifrices against two of the common oral microbes, namely Streptococcus mutans and Candida albicans. Materials and Methods: To determine the antimicrobial properties of individual dentifrices, the zone of inhibition on the blood agar plates was measured and also disc diffusion method was used for testing the antibacterial properties for which a thin paper disc containing the antimicrobial agent was applied on a culture of bacteria grown on agar media. Each dentifrice was tested in 50% concentration (1:1 dilution [50% w/w] using sterile deionized distilled water/half strength) and 100% concentration (full strength). The blood agar plates were then incubated aerobically at 37°C. The measurement of zone of inhibition was done after 24–48 and 72 h on the underside of the Petri dishes using Vernier calipers. Results: At 50% concentration, Regimen B2 showed the maximum zone of inhibition which was closely followed by Regimen A1 for S. mutans, whereas at 100% concentration, Regimen A1 showed better effects. For C. albicans, it was observed that Dabur red toothpaste showed the significantly higher zone of inhibition at 50% concentration when the concentration was made 100% and also Dabur red toothpaste showed the maximum zone of inhibition. Conclusion: This concluded that the herbal dentifrices are equally and sometimes better than the conventional ones.
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Affiliation(s)
- Nikesh Thounaojam
- Department of Periodontology, Daswani Dental College and Research Centre, Kota, Rajasthan, India
| | - Nelson Sanjenbam
- Department of Oral and Maxillofacial Surgery, JNIMS Dental College, Porompat, Imphal East, Manipur, India
| | - Supriyo Pal
- Department of Oral and Maxillofacial Surgery, Sri Siddhartha Dental College and Hospital, Tumkur, Karnataka, India
| | | | - Kunal Kumar
- Dentist, Private Practitioner, Priyanka Clinic, Muzaffarpur, Bihar, India
| | - Mayank Shah
- Department of Prosthodontics and Crown and Bridge, Awadh Dental College and Hospital, Jamshedpur, Jharkhand, India
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22
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Kumar A, Raj A, Singh DK, Donthagani S, Kumar M, Ramesh K. A New Zinc Reinforced Glass Ionomer Cement: A Boon in Dentistry. J Pharm Bioallied Sci 2021; 13:S272-S275. [PMID: 34447091 PMCID: PMC8375885 DOI: 10.4103/jpbs.jpbs_730_20] [Citation(s) in RCA: 1] [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: 11/03/2020] [Revised: 11/28/2020] [Accepted: 11/28/2020] [Indexed: 11/25/2022] Open
Abstract
Background: Conventional glass ionomer cement (CGIC) has many beneficial properties, but it has poor physical and mechanical properties. Therefore, new glass ionomer cement (GIC) is manufactured by adding zinc to improve the mechanical properties of GIC ChemFil Rock. This material possesses better flexural tensile strength and compressive strength in comparison to conventional to CGIC. Objectives: The aim of this study was to compare four properties of ZRGI like fracture toughness, surface micro-hardness, abrasive wear, and roughness to other GIC material, which are commercially available as: resin-coated glass ionomer (EQUIA FIL). Materials and Methods: The study was done in dual phase. In phase-1, micro-hardness surface roughness, abrasion of four GIC and a composite resin as control was analyzed and in phase-2, fracture toughness of four GIC was done at 24 h interval so that all cement achieve its peak strength. Results: Micro-hardness value of ChemFil Rock was lowest among different GIC groups. All four GIC group exhibit similar abrasion capacities, while composite were more wear-resistant significantly. Roughness change was highest on ChemFil Rock compared to other GIC. EQUIA FIL has the highest fracture toughness, followed by ChemFil Rock. Conclusion: We can conclude that incorporating zinc in the matrix of chemfil rock increases fracture toughness and good abrasive wear, but it does not improve micro-hardness or surface roughness.
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Affiliation(s)
- Amit Kumar
- Consultant Endodontist, Patna, Bihar, India
| | - Anil Raj
- Department of Public Health Dentistry, Sarjug Dental College and Hospital, Darbhanga, Bihar, India
| | | | | | - Manoj Kumar
- Department of Prothodontics and Implantology, Rama Dental College and Hospital, Kanpur, Uttar Pradesh, India
| | - Kumar Ramesh
- Department of Dentistry, Anugrah Narayan Magadh Medical College and Hospital, Gaya, Bihar, India
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23
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Banday S, Pandita RK, Mushtaq A, Bacolla A, Mir US, Singh DK, Jan S, Bhat KP, Hunt CR, Rao G, Charaka VK, Tainer JA, Pandita TK, Altaf M. Autism-Associated Vigilin Depletion Impairs DNA Damage Repair. Mol Cell Biol 2021; 41:e0008221. [PMID: 33941620 PMCID: PMC8224237 DOI: 10.1128/mcb.00082-21] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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] [Received: 02/27/2021] [Revised: 03/17/2021] [Accepted: 04/28/2021] [Indexed: 12/24/2022] Open
Abstract
Vigilin (Vgl1) is essential for heterochromatin formation, chromosome segregation, and mRNA stability and is associated with autism spectrum disorders and cancer: vigilin, for example, can suppress proto-oncogene c-fms expression in breast cancer. Conserved from yeast to humans, vigilin is an RNA-binding protein with 14 tandemly arranged nonidentical hnRNP K-type homology (KH) domains. Here, we report that vigilin depletion increased cell sensitivity to cisplatin- or ionizing radiation (IR)-induced cell death and genomic instability due to defective DNA repair. Vigilin depletion delayed dephosphorylation of IR-induced γ-H2AX and elevated levels of residual 53BP1 and RIF1 foci, while reducing Rad51 and BRCA1 focus formation, DNA end resection, and double-strand break (DSB) repair. We show that vigilin interacts with the DNA damage response (DDR) proteins RAD51 and BRCA1, and vigilin depletion impairs their recruitment to DSB sites. Transient hydroxyurea (HU)-induced replicative stress in vigilin-depleted cells increased replication fork stalling and blocked restart of DNA synthesis. Furthermore, histone acetylation promoted vigilin recruitment to DSBs preferentially in the transcriptionally active genome. These findings uncover a novel vigilin role in DNA damage repair with implications for autism and cancer-related disorders.
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Affiliation(s)
- Shahid Banday
- Chromatin and Epigenetics Lab, Department of Biotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Raj K. Pandita
- Houston Methodist Research Institute, Houston, Texas, USA
- Baylor College of Medicine, Houston, Texas, USA
| | - Arjamand Mushtaq
- Chromatin and Epigenetics Lab, Department of Biotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Albino Bacolla
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Ulfat Syed Mir
- Chromatin and Epigenetics Lab, Department of Biotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, India
| | | | - Sadaf Jan
- Chromatin and Epigenetics Lab, Department of Biotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, India
| | - Krishna P. Bhat
- Department of Pathology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | | | - Ganesh Rao
- Baylor College of Medicine, Houston, Texas, USA
| | | | - John A. Tainer
- Department of Molecular and Cellular Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
- Department of Cancer Biology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Tej K. Pandita
- Houston Methodist Research Institute, Houston, Texas, USA
- Baylor College of Medicine, Houston, Texas, USA
| | - Mohammad Altaf
- Chromatin and Epigenetics Lab, Department of Biotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, India
- Centre for Interdisciplinary Research and Innovations, University of Kashmir, Srinagar, Jammu and Kashmir, India
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24
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Ram K, Thakur RC, Singh DK, Kawamura K, Shimouchi A, Sekine Y, Nishimura H, Singh SK, Pavuluri CM, Singh RS, Tripathi SN. Why airborne transmission hasn't been conclusive in case of COVID-19? An atmospheric science perspective. Sci Total Environ 2021; 773:145525. [PMID: 33940729 PMCID: PMC7984961 DOI: 10.1016/j.scitotenv.2021.145525] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/15/2021] [Accepted: 01/26/2021] [Indexed: 05/06/2023]
Abstract
Airborne transmission is one of the routes for the spread of COVID-19 which is caused by inhalation of smaller droplets1 containing SARS-CoV-2 (i.e., either virus-laden particulate matter: PM and/or droplet nuclei) in an indoor environment. Notably, a significant fraction of the small droplets, along with respiratory droplets, is produced by both symptomatic and asymptomatic individuals during expiratory events such as breathing, sneezing, coughing and speaking. When these small droplets are exposed to the ambient environment, they may interact with PM and may remain suspended in the atmosphere even for several hours. Therefore, it is important to know the fate of these droplets and processes (e.g., physical and chemical) in the atmosphere to better understand airborne transmission. Therefore, we reviewed existing literature focussed on the transmission of SARS-CoV-2 in the spread of COVID-19 and present an environmental perspective on why airborne transmission hasn't been very conclusive so far. In addition, we discuss various environmental factors (e.g., temperature, humidity, etc.) and sampling difficulties, which affect the conclusions of the studies focussed on airborne transmission. One of the reasons for reduced emphasis on airborne transmission could be that the smaller droplets have less number of viruses as compared to larger droplets. Further, smaller droplets can evaporate faster, exposing SARS-CoV-2 within the small droplets to the environment, whose viability may further reduce. For example, these small droplets containing SARS-CoV-2 might also physically combine with or attach to pre-existing PM so that their behaviour and fate may be governed by PM composition. Thus, the measurement of their infectivity and viability is highly uncertain due to a lack of robust sampling system to separately collect virions in the atmosphere. We believe that the present review will help to minimize the gap in our understanding of the current pandemic and develop a robust epidemiological method for mortality assessment.
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Affiliation(s)
- Kirpa Ram
- Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi 221005, India.
| | - Roseline C Thakur
- Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, 00014 Helsinki, Finland.
| | - Dharmendra Kumar Singh
- French National Centre for Scientific Research (CNRS)/IRCE Lyon, 2 avenue Albert Einstein, Villeurbanne 69100, France.
| | - Kimitaka Kawamura
- Chubu Institute for Advanced Studies, Chubu University, Kasugai 487-8501, Japan.
| | - Akito Shimouchi
- School of Life and Health Sciences, Chubu University, Kasugai 487-8501, Japan.
| | - Yoshika Sekine
- Department of Chemistry, Tokai University, Hiratsuka, Kanagawa 25901292, Japan.
| | - Hidekazu Nishimura
- Virus Research Center, Clinical Research Division, Sendai Medical Center, Sendai, Japan.
| | - Sunit K Singh
- Laboratory of Molecular Virology & Immunology, Molecular Biology Unit, Faculty of Medicine, Institute of Medical Sciences (IMS), Banaras Hindu University (BHU), Varanasi 221005, India.
| | - Chandra Mouli Pavuluri
- Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China.
| | - R S Singh
- Department of Chemical Engineering, IIT (BHU), Varanasi 221005, Uttar Pradesh, India.
| | - S N Tripathi
- Department of Civil Engineering, Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India.
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25
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Singh DK, Boruah T, Sharma A, Khanna G, Krishna LG, Kumar N. Comparative analysis of CT guided vertebral biopsy by a conventional bone biopsy needle versus bone biopsy needle with acquisition cradle. J Clin Orthop Trauma 2021; 19:231-236. [PMID: 34150496 PMCID: PMC8193153 DOI: 10.1016/j.jcot.2021.05.032] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND We aimed to compare the rate of diagnostically successful vertebral biopsies using conventional bone biopsy needles versus those performed with bone biopsy needles with an acquisition cradle. METHODS We retrospectively analyzed the data of patients who underwent CT-guided vertebral biopsy between December 2017 to December 2019 at our institute. From December 2017 to November 2018, the procedure was performed on 185 patients using an 11G conventional bone biopsy needle, Jamshidi needleTM "(group 1)". From December 2018 to December 2019, the procedure was performed on 242 patients using an 11G T-handle Jamshidi needle with an acquisition cradle "(group 2)". We reviewed their histopathological reports for both groups of patients to determine the rate of diagnostically successful biopsies. We also compared the crush artifact amongst the unsuccessful biopsy samples acquired by the two types of biopsy needles. RESULTS 427 patients (270 male and 157 female patients; mean age, 46.4 years; age range, 25-67 years) who underwent CT-guided vertebral biopsy from December 2017 to December 2019 were included in our study. In group 1, diagnostic success was achieved in 136 out of 185 biopsies (73.5%); whereas in group 2, diagnostic success was achieved in 219 out of 242 biopsies (90.50%), p < 0.0001. Out of the diagnostically unsuccessful biopsies in Group 1, 36 out of 49 (73.5%) were due to crush artifact; whereas crush artifact accounted for only 3 out of 23 (13.0%) diagnostically unsuccessful biopsies in group 2, p < 0.0001. Other causes of unsuccessful biopsies (hemorrhagic contents or presence of normal osseous tissue and fibrin only) were statistically insignificant. CONCLUSION The use of a T-handle Jamshidi needle with an acquisition cradle appears beneficial compared to the conventional Jamshidi needle in terms of the significantly higher rate of diagnostic success and a lower rate of crush artifact.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Radiodiagnosis, Vardhmaan Mahavir Medical College and Safdarjung Hospital, New Delhi, 110029, India
| | - Tankeshwar Boruah
- Central Institute of Orthopedics, Vardhmaan Mahavir Medical College and Safdarjung Hospital, New Delhi, 110029, India
| | - Anuradha Sharma
- Department of Radiodiagnosis, Vardhmaan Mahavir Medical College and Safdarjung Hospital, New Delhi, 110029, India
| | - Geetika Khanna
- Central Institute of Orthopedics, Vardhmaan Mahavir Medical College and Safdarjung Hospital, New Delhi, 110029, India
| | - Loveneesh G. Krishna
- Central Institute of Orthopedics, Vardhmaan Mahavir Medical College and Safdarjung Hospital, New Delhi, 110029, India
| | - Nishith Kumar
- Department of Radiodiagnosis, Vardhmaan Mahavir Medical College and Safdarjung Hospital, New Delhi, 110029, India,Corresponding author. Department of Radiodiagnosis, Vardhmaan Mahavir Medical College and Safdarjung Hospital, New Delhi, 110029, India.
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Khare M, Dewangan Y, Nayak T, Singh DK, Vibhakar V, Ramesh K. Oral and Esophageal Cancer: Incidence, Prevalence and Correlation in General Indian Population: A retrospective Study. J Pharm Bioallied Sci 2021; 13:S221-S224. [PMID: 34447080 PMCID: PMC8375816 DOI: 10.4103/jpbs.jpbs_695_20] [Citation(s) in RCA: 1] [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: 10/22/2020] [Revised: 10/24/2020] [Accepted: 10/30/2020] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Squamous cell carcinoma is the most frequent head-and-neck malignancy and chiefly encompasses malignancies of the upper aerodigestive tract, including the oral cavity, nasal cavity, paranasal sinuses, nasopharynx, oropharynx, hypopharynx, pharynx, and larynx. OBJECTIVES The current study was conducted to evaluate the incidence, prevalence, and correlation of oral and esophageal cancer in the Indian population. MATERIALS AND METHODS The present study was conducted on the basis of data collected from various government cancer hospitals in India. A total of 1000 patients of either sex admitted to the oncology ward with head-and-neck cancer from June 2018 to June 2020 were included in the study. Information regarding family history, deleterious habits, and immunity status was also collected from their medical records. The readings were recorded in a master chart, and data analysis was carried out statistically. RESULTS A total of 1000 patients (617 males and 383 females) between the age range of 38 and 86 years were selected for the study. A total of 425 out of 1000 patients had esophageal cancer, whereas, 575 patients had oral cancer. A total of 347 males and 228 females had oral cancer, whereas 270 males and 155 females had esophageal cancer. Among the patients with oral cancer, 44 presented with a history of cigarette smoking, 49 with bidi smoking, 140 with tobacco chewing, 142 with gutkha chewing, and 159 with betel quid chewing. Majority of the patients had a habit of consuming tobacco in smokeless form. Among the patients with esophageal cancer, 175 presented with a history of cigarette smoking, 136 with bidi smoking, 12 with tobacco chewing, 13 with gutkha chewing, and nine with betel quid chewing. CONCLUSION The incidence of both types of cancer was high in older age group, particularly in those aged above 50 years. Males had a higher predilection rate than females for both cancer types. The incidence of oral cancer was higher than that of esophageal cancer. Majority of the patients with oral cancer had a history of tobacco consumption in smokeless form, whereas the ones with esophageal cancer reported with a history of tobacco consumption in smoked form.
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Affiliation(s)
- Manish Khare
- Depatment of General Surgery, Sri Shankaracharya Institute of Medical Sciences, Bhilai, Chhattisgarh, India
| | - Yatindra Dewangan
- Depatment of General Surgery, Sri Shankaracharya Institute of Medical Sciences, Bhilai, Chhattisgarh, India
| | - Tarun Nayak
- Depatment of General Surgery, Sri Shankaracharya Institute of Medical Sciences, Bhilai, Chhattisgarh, India
| | | | - Vimal Vibhakar
- Depatment of General Surgery, Naval Hospital Navjivani, Kannur, Kerala, India
| | - Kumar Ramesh
- Department of Dentistry, Anugrah Narayan Magadh Medical College and Hospital, Gaya, Bihar, India
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Bhakhri BK, Singh DK, Singh N, Rai R. Does Malaria Co-Infection Alter the Clinical Course in Children Infected with Dengue? Analysis from 623 Indian Children Admitted with Dengue Infection. J Trop Pediatr 2021; 67:6284319. [PMID: 34037787 DOI: 10.1093/tropej/fmab006] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND Dengue and malaria co-infection has been reported in several case reports. We aim to study effect of malaria co-infection on clinical outcomes of dengue infection. METHODS Records of 623 children with dengue infection, based on NS-1 antigen and IgM ELISA testing, were collected. Malaria co-infection was identified in 20 cases, based on peripheral blood smear examination. Clinical and hematological parameters were compared in two groups (malaria co-infection vs. dengue mono-infection). RESULTS Duration of hospitalization was significantly higher in co-infected group. Significantly higher proportion of malaria co-infection cases had hepatosplenomegaly, hemoglobin ≤8 g/dl, serum albumin ≤3 g/dl, serum bilirubin ≥1 mg/dl, serum aspartate aminotransferase ≥500 U/l and serum alanine aminotransferase ≥300 U/l. Number of transfusions (PRBC and platelets) required in malaria co-infection group was higher. CONCLUSION Malaria co-infection in dengue impacts clinical presentation, hematological parameters, requirement of blood transfusion and morbidity. High index of suspicion is warranted while evaluating febrile patients.
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Affiliation(s)
- Bhanu Kiran Bhakhri
- Department of Pediatrics, Superspecialty Pediatric Hospital & Postgraduate Teaching Institute, Noida, Uttar Pradesh 201301, India
| | - Dharmendra Kumar Singh
- Department of Pediatrics, Superspecialty Pediatric Hospital & Postgraduate Teaching Institute, Noida, Uttar Pradesh 201301, India
| | - Nupur Singh
- Department of Pediatrics, Superspecialty Pediatric Hospital & Postgraduate Teaching Institute, Noida, Uttar Pradesh 201301, India
| | - Ruchi Rai
- Department of Neonatology & MRH, Superspecialty Pediatric Hospital & Postgraduate Teaching Institute, Noida, Uttar Pradesh 201301, India
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Rai R, Singh DK, Bhakhri BK. Transient hypothyroxinemia of prematurity and its risk factors in an extramural neonatal intensive care unit. Arch Endocrinol Metab 2021; 65:723-729. [PMID: 33909379 PMCID: PMC10065390 DOI: 10.20945/2359-3997000000360] [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: 11/23/2022]
Abstract
Objective Thyroid functions in preterm newborns may be altered in the first week of life. Hypothyroxinemia has been commonly reported in these babies, which could be due to the immaturity of the hypothalamic pituitary thyroid axis or acute illness. It could have a long-term impact on the developing brain of these babies. We conducted this study to estimate the incidence of transient hypothyroxinemia of prematurity (THOP) and to determine its risk factors. Methods We analyzed thyroid stimulating hormone (TSH) and free T4 levels of 64 preterm neonates admitted in the neonatal intensive care unit. TSH and free T4 levels were measured in the first week and then at 14-21 days of life to estimate the incidence of THOP and determine its risk factors. We also estimated the incidence of congenital hypothyroidism (CH) and delayed TSH elevation in CH. Risk analysis was conducted using simple and multiple logistic regression, and numerical data was compared using the Mann Whitney U test and t test. Results THOP was seen in 25% of the preterm babies. Caesarean delivery, presence of one or more morbidities, mechanical ventilation, birth weight ≥ 1,500 g, and gestational age ≥ 32 weeks were identified as risk factors for THOP based on simple logistic regression. In multiple regression, mechanical ventilation and gestational age ≥ 32 weeks were significantly associated with THOP. CH was seen in 2 (3.1%) babies, and 1 of these cases had delayed TSH elevation. Conclusion Thyroid abnormalities are common in preterm admitted neonates. Mechanical ventilation is an independent risk factor for development of THOP.
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Affiliation(s)
- Ruchi Rai
- Department of Neonatology (Maternal Reproductive Health), Super Speciality Pediatric Hospital and Postgraduate Teaching Institute, Noida, UP, India,
| | - Dharmendra Kumar Singh
- Department of Pediatrics, Super Speciality Pediatric Hospital and Postgraduate Teaching Institute, Noida, UP, India
| | - Bhanu Kiran Bhakhri
- Department of Pediatrics, Super Speciality Pediatric Hospital and Postgraduate Teaching Institute, Noida, UP, India
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Singh DK, Sharma A, Boruah T, Kumar N, Suman S, Jaiswal B. Computed Tomography-Guided Vertebral Biopsy in Suspected Tuberculous Spondylodiscitis: Comparing a New Navigational Tram-Track Technique versus Conventional Method. Journal of Clinical Interventional Radiology ISVIR 2020. [DOI: 10.1055/s-0040-1721532] [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: 10/22/2022] Open
Abstract
Abstract
Introduction Computed tomography (CT)-guided vertebral biopsy is always recommended for histopathological and microbiological confirmation in cases of tuberculous spondylodiscitis and for antimycobacterial drug sensitivity testing.
Aim To compare the conventional technique and a novel axis-defined tram-track technique of CT-guided vertebral biopsy in suspected tuberculous spondylodiscitis.
Materials and Methods Sixty-seven patients of clinico-radiologically suspected tuberculous spondylodiscitis referred for CT-guided vertebral biopsy were categorized into two groups: “Group A” patients (n = 32) underwent biopsy by conventional technique, and “Group B” patients (n = 35) by axis-defined tram-track technique. The time taken for procedure, radiation exposure, and any procedural complications were recorded for both the groups.
Results A statistically significant difference in procedure time and mean radiation dose was observed between the two groups: a longer procedural time was required in “Group A” (52.5 ± 3.5 minutes) as compared to “Group B” (37.3 ± 3.6 minutes) (p < 0.0001); and mean radiation dose (CTDIvol) in “Group A” and “Group B” was 8.64 ± 1.06 mGy and 5.73 ± 0.71 mGy, respectively (p < 0.0001). However, the difference in complication rate and tissue yield for successful diagnosis of the biopsies in the two groups was found to be statistically insignificant.
Conclusion Axis-defined tram-track technique was found to have a significantly shorter procedural time as well as lower radiation exposure compared to the conventional technique of vertebral biopsy in our study.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Anuradha Sharma
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Tankeshwar Boruah
- Central Institute of Orthopedics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Nishith Kumar
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Saurabh Suman
- Department of Radiodiagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Binita Jaiswal
- Department of Anesthesia, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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Singh DK, Kumar N, Nayak BK, Jaiswal B, Tomar S, Mittal MK, Bajaj SK. Approach-based techniques of CT-guided percutaneous vertebral biopsy. ACTA ACUST UNITED AC 2020; 26:143-146. [PMID: 32071026 DOI: 10.5152/dir.2019.19268] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [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]
Abstract
Magnetic resonance imaging (MRI) plays an important role in the characterization of vertebral lesions. Even if latest improvements in MRI permit to understand and suspect the nature of vertebral lesions and positron emission tomography computed tomography (PET-CT) gives information about lesion metabolism, biopsy is still needed in most cases. CT-guided percutaneous vertebral biopsy is a minimally invasive, safe and accurate procedure for definitive tissue diagnosis of a vertebral lesion. CT-guided vertebral biopsy is often the best alternative to a surgical biopsy. The purpose of this technical note is to discuss the approach-based techniques for CT-guided percutaneous vertebral biopsy.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Nishith Kumar
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Bibhu Kalyan Nayak
- Department of Sports Medicine, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Binita Jaiswal
- Department of Anesthesia, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Sagar Tomar
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Mahesh Kumar Mittal
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Sunil Kumar Bajaj
- Department of Radio-diagnosis, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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Singh DK, Katyan A, Kumar N, Nigam K, Jaiswal B, Misra RN. CT-guided radiofrequency ablation of osteoid osteoma: established concepts and new ideas. Br J Radiol 2020; 93:20200266. [PMID: 32520586 DOI: 10.1259/bjr.20200266] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Osteoid osteoma is a painful benign bone tumour of children and young adults with characteristic clinico-radiological features depending upon the location of the lesion. Intraoperative visualisation of the nidus is difficult and therefore curative surgery is often associated with excessive bone removal, significant perioperative morbidity and potential need of bone grafting procedures. With advancement in cross-sectional imaging and radiofrequency ablation (RFA) technology, CT-guided RFA has emerged as the treatment of choice for the osteoid osteoma. This procedure involves accurate cannulation of the nidus and subsequent thermocoagulation-induced necrosis.Multidisciplinary management approach is the standard of care for patients with osteoid osteoma. Appropriate patient selection, identification of imaging pitfalls, pre-anaesthetic evaluation and a protocol-based interventional approach are the cornerstone for a favourable outcome. Comprehensive patient preparation with proper patient position and insulation is important to prevent complications. Use of spinal needle-guided placement of introducer needle, namely, "rail-road technique" is associated with fewer needle trajectory modifications, reduced radiation dose and patient morbidity and less intervention time. Certain other procedural modifications are employed in special situations, for example, intra-articular osteoid osteoma and osteoid osteoma of the subcutaneous bone in order to reduce complications. Treatment follow-up generally includes radiographic assessment and evaluation of pain score. Dynamic contrast-enhanced MRI has been recently found useful for demonstrating post-RFA healing.
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Affiliation(s)
- Dharmendra Kumar Singh
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Amit Katyan
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Nishith Kumar
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Kanchan Nigam
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Binita Jaiswal
- Department of Anesthesia and Critical Care, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
| | - Ritu Nair Misra
- Department of Radiology and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
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Singh R, Singh A, Singh DK, Nazeer J, Singh S. Comparative evaluation of 2D miniplates and 3D miniplates fixation in mandibular angle fracture - A clinical study. Indian J Dent Res 2020; 31:134-137. [PMID: 32246696 DOI: 10.4103/ijdr.ijdr_885_19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 11/04/2022] Open
Abstract
Introduction Mandibular angle fracture is common in road traffic accidents. This study was conducted to compare 3D miniplate system with 2D plates for treatment of mandibular angle fractures. Materials and Methods The study was conducted on 120 patients with mandibular angle fracture of both genders. After selecting patients, patients were divided into 2 groups of 60 each. In group I, patients were treated with 3D, 2.0-mm titanium plates, and in group II, patients were treated with 2D, 2.0-mm titanium miniplate in mandibular angle fracture. Patients were evaluated regularly after 1, 3, and 6 months for outcome of treatment. Results In group I, males were 22 and females were 38. In group II, males were 40 and females were 20. Right angle fracture was seen in 32 patients in group I and 26 in group II. Left angle fracture was seen in 24 in group I and 28 in group II. Right angle and left parasymphysis fracture was seen in 3 in group I and 4 in group II. Left angle and right parasymphysis fracture was seen in 1 in group I and 2 in group II. [Table 3], [Graph 1] shows that in group I, after 1 month sensory deficit was present in 5 patients and in group II in 12 patients. After 3 months, there were no patients with sensory deficit in group I and 2 in group II. Preoperatively in group I, mouth opening was 24 mm and in group II patients was 25.80 mm, which increased to 31.20 mm in group I and 28.20 mm in group II at 1 month, 32 mm in group I and 30 mm in group II at 3 months, and 37.20 and 32.12 mm in groups I and II, respectively, at 6 months. The difference was significant (P < 0.05). Conclusion 3D miniplate system is reliable and effective treatment modality for mandibular angle fractures as compared with traditional 2D miniplates.[INLINE:1].
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Affiliation(s)
- Rohit Singh
- Department of Prosthodontics and Crown Bridge and Implantology, Patna Dental College and Hospital, Patna, Bihar, India
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- Conservative Dentistry and Endodontics, Patna Dental College and Hospital, Patna, Bihar, India
| | - Anju Singh
- Department of Dentistry, NMCH, Patna, Bihar, India
| | - D K Singh
- Prosthodontics and Crown Bridge and Implantology, Patna Dental College and Hospital, Patna, Bihar, India
| | - Jazib Nazeer
- Oral Pathology and Microbiology, Patna Dental College and Hospital, Patna, Bihar, India
| | - Supriya Singh
- Private Practitioner, Multispecialty Dental Clinic Patna, Bihar, India
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Soni N, Singh VK, Singh DK. HPLC characterization of molluscicidal component of Tamarindus indica and its mode of action on nervous tissue of Lymnaea acuminata. J Ayurveda Integr Med 2020; 11:131-139. [PMID: 30120053 PMCID: PMC7329724 DOI: 10.1016/j.jaim.2017.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 04/06/2017] [Revised: 07/24/2017] [Accepted: 09/29/2017] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Fasciolosis is a water-borne disease with gastropods snail (Lymnaea acuminata) act as key-link is still burden for mankind especially in developing countries. Snail control is one of the important tools to trim down the frequency of fasciolosis. OBJECTIVE To evaluate the toxic effect and inhibitory potential of plant Tamarindus indica and their active constituent on the key enzyme of nervous tissue of snail L. acuminata. METHOD The present study deals with the chromatographic isolation and identification of molluscicidal component from Tamarindus indica bark and its effects on enzymes activities of vector snail L. acuminata. RESULT The toxicity study reveals that among all organic extract ethanol extract of T. indica bark (96 h LC50:127.4 mgL-1) was more effective than other organic extracts. The 96 h LC50 of column purified fraction of T. indica bark was 13.78 mgL-1 respectively. Saponin was isolated, characterized and identified as active molluscicidal component in the bark of T. indica by column chromatography, TLC and HPLC chromatographic methods. The in vivo and in vitro treatment of column purified fraction and saponin has significant inhibition in enzyme AChE, ACP and ALP activities. The study of inhibition kinetics indicates that inhibition of AChE and ALP is competitive, while ACP is uncompetitive in both the treatments. CONCLUSION Thus inhibition of these enzyme activities by T. indica bark column purified fraction and saponin in the snail L. acuminata may be the cause of its molluscicidal activity which leads snail death.
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Affiliation(s)
- Neelam Soni
- Malacology Laboratory, Department of Zoology, D.D.U. Gorakhpur University, Gorakhpur, Uttar Pradesh, 273 009, India
| | - Vinay Kumar Singh
- Malacology Laboratory, Department of Zoology, D.D.U. Gorakhpur University, Gorakhpur, Uttar Pradesh, 273 009, India.
| | - D K Singh
- Malacology Laboratory, Department of Zoology, D.D.U. Gorakhpur University, Gorakhpur, Uttar Pradesh, 273 009, India
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Tyagi N, Singh DK, Dash D, Singh R. Curcumin Modulates Paraquat-Induced Epithelial to Mesenchymal Transition by Regulating Transforming Growth Factor-β (TGF-β) in A549 Cells. Inflammation 2020; 42:1441-1455. [PMID: 31028577 DOI: 10.1007/s10753-019-01006-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Paraquat (PQ), a widely used potent herbicide, generates superoxide anions and other free radicals, leading to severe toxicity and acute lung injury. PQ induces pulmonary fibrosis through epithelial to mesenchymal transition (EMT) characterized by increased number of myofibroblasts. Time-dependent PQ-induced EMT has been evaluated in present investigation where intracellular ROS levels were significantly enhanced after 24 h of PQ intoxication. Anti-inflammatory effects of curcumin have been studied where alveolar epithelial cells (A549 cells) were incubated with curcumin (30 μΜ) for 1 and 3 h before PQ intoxication (700 μM). Western blot and immunocytochemistry studies revealed that pretreatment of A549 cells with curcumin for 3 h before PQ exposure has maintained E-cadherin expression and inhibited PQ induced α-smooth-muscle actin (α-SMA) expression. Transforming growth factor-β (TGF-β) that seems to be involved in PQ-induced EMT was enhanced after PQ intoxication, but curcumin pretreatment has effectively inhibited its expression. Immunostaining studies have shown that curcumin pretreatment has significantly reduced matrix metalloproteinase-9 (MMP-9) expressions, which were elevated after PQ intoxication. These results demonstrate that curcumin can regulate PQ-induced EMT by regulating the expression of TGF-β.
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Affiliation(s)
- Namitosh Tyagi
- Department of Zoology, MMV, Banaras Hindu University, Varanasi, 221005, India
| | - D K Singh
- Department of Physics, Udai Pratap Autonomous College, Varanasi, 221002, India
| | - D Dash
- Department of Biochemistry, Institute of Medical Sciences, Banaras Hindu University, Varanasi, 221005, India
| | - Rashmi Singh
- Department of Zoology, MMV, Banaras Hindu University, Varanasi, 221005, India.
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Gérard V, Noziere B, Fine L, Ferronato C, Singh DK, Frossard AA, Cohen RC, Asmi E, Lihavainen H, Kivekäs N, Aurela M, Brus D, Frka S, Cvitešić Kušan A. Concentrations and Adsorption Isotherms for Amphiphilic Surfactants in PM 1 Aerosols from Different Regions of Europe. Environ Sci Technol 2019; 53:12379-12388. [PMID: 31553874 DOI: 10.1021/acs.est.9b03386] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Predicting the activation of submicrometer particles into cloud droplets in the atmosphere remains a challenge. The importance of surface tension, σ (mN m-1), in these processes has been evidenced by several works, but information on the "surfactants" lowering σ in actual atmospheric particles remains scarce. In this work, PM1 aerosols from urban, coastal, and remote regions of Europe (Lyon, France, Rogoznica, Croatia, and Pallas, Finland, respectively) were investigated and found to contain amphiphilic surfactants in concentrations up to 2.8 μg m-3 in the air and 1.3 M in the particle dry volume. In Pallas, correlations with the PM1 chemical composition showed that amphiphilic surfactants were present in the entire range of particle sizes, supporting recent works. This implied that they were present in hundreds to thousands of particles cm-3 and not only in a few large particles, as it has been hypothesized. Their adsorption isotherms and critical micelle concentration (CMC) were also determined. The low CMC obtained (3 × 10-5-9 × 10-3 M) implies that surface tension depression should be significant for all the particles containing these compounds, even at activation (growth factor ∼ 10). Amphiphilic surfactants are thus likely to enhance the CCN ability of submicrometer atmospheric particles.
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Affiliation(s)
- Violaine Gérard
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS , Université Lyon 1 , 69626 Villeurbanne , France
| | - Barbara Noziere
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS , Université Lyon 1 , 69626 Villeurbanne , France
| | - Ludovic Fine
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS , Université Lyon 1 , 69626 Villeurbanne , France
| | - Corinne Ferronato
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS , Université Lyon 1 , 69626 Villeurbanne , France
| | - Dharmendra Kumar Singh
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), CNRS , Université Lyon 1 , 69626 Villeurbanne , France
| | - Amanda A Frossard
- Department of Chemistry , University of California, Berkeley , Berkeley , California 94720 , United States
| | - Ronald C Cohen
- Department of Chemistry , University of California, Berkeley , Berkeley , California 94720 , United States
| | - Eija Asmi
- Atmospheric Composition Research , Finnish Meteorological Institute , 00101 Helsinki , Finland
| | - Heikki Lihavainen
- Atmospheric Composition Research , Finnish Meteorological Institute , 00101 Helsinki , Finland
- Svalbard Integrated Arctic Earth Observing System , 9171 Longyearbyen , Norway
| | - Niku Kivekäs
- Atmospheric Composition Research , Finnish Meteorological Institute , 00101 Helsinki , Finland
| | - Minna Aurela
- Atmospheric Composition Research , Finnish Meteorological Institute , 00101 Helsinki , Finland
| | - David Brus
- Atmospheric Composition Research , Finnish Meteorological Institute , 00101 Helsinki , Finland
| | - Sanja Frka
- Division for Marine and Environmental Research , Ruđer Bošković Institute , Zagreb 10000 , Croatia
| | - Ana Cvitešić Kušan
- Division for Marine and Environmental Research , Ruđer Bošković Institute , Zagreb 10000 , Croatia
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Mukhia S, Mandal P, Singh DK, Singh D. The abundance of epiphytic liverworts on the bark of Cryptomeria japonica in relation to different physical and biochemical attributes, found in Senchal Wildlife Sanctuary, Darjeeling, Eastern Himalaya. BMC Ecol 2019; 19:37. [PMID: 31510990 PMCID: PMC6739907 DOI: 10.1186/s12898-019-0253-9] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 09/03/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Maintenance of biodiversity is an integral part of sustainable forest management. Epiphytic bryophytes are an important element of biodiversity. Thus, this work aims to study the role of different physical and biochemical factors in affecting the growth and proliferation of epiphytic liverworts. Fifty trees in three different plots, distributed in Senchal wildlife sanctuary, Darjeeling, were surveyed. Factors such as light intensity, moisture, and diameter at breast height (DBH) of the tree were studied to evaluate their possible role in affecting epiphytic liverworts. The effect of bark biochemical characteristics on the abundance of epiphytic liverworts was also studied by undertaking a quantitative test of pH, phenol, flavonoid, ortho-dihydric phenol, terpene, total sugar, and tannin. Multiple regression analysis and principal component analysis (PCA) were carried out to test the effects of these parameters. RESULTS Light intensity, moisture, and DBH highly influenced the abundance of liverworts. Old trees had higher epiphytic liverwort cover than younger ones. Bark biochemical properties like pH, phenol, flavonoid, ortho-dihydric phenol, tannin and sugar did not have a significant effect on the epiphytic liverwort cover, while the terpenoid content of the bark reduced liverworts cover. CONCLUSION To sustain the occurrence of epiphytic liverworts in ecosystems, forest management should ensure the presence of old trees. Light intensity and moisture had a large effect on the distribution and abundance of liverworts, so it is important to maintain tree cover, shrub layer, and tree density.
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Affiliation(s)
- Sumira Mukhia
- Plant Physiology and Pharmacognosy Research Laboratory, Department of Botany, North Bengal University, Raja Rammohunpur, District, P.O: NBU, Darjeeling, West Bengal, 734 013, India
| | - Palash Mandal
- Plant Physiology and Pharmacognosy Research Laboratory, Department of Botany, North Bengal University, Raja Rammohunpur, District, P.O: NBU, Darjeeling, West Bengal, 734 013, India.
| | - D K Singh
- Botanical Survey of India, CGO Complex, 3rd MSO Building, Salt Lake Sector I, Kolkata, West Bengal, 700 064, India
| | - Devendra Singh
- Botanical Survey of India, CGO Complex, 3rd MSO Building, Salt Lake Sector I, Kolkata, West Bengal, 700 064, India
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Jeet P, Singh DK, Sarangi A. Development of a Composite Hydrologic Index for Semi-Arid Region of India. Ground Water 2019; 57:749-755. [PMID: 30740694 DOI: 10.1111/gwat.12867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 01/30/2019] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
Rainfall is the major source for groundwater recharge in basins areas of central region of India. Now a day, the river basins are experiencing acute shortage of water which has resulted in lowering of groundwater level and drying up of water bodies. In order to maintain water sustainability; a composite hydrologic index was developed in the Betwa basin of Madhya Pradesh and Uttar Pradesh states, India. The index was developed using principal component analysis through hydrologic, topographic as well as geographic parameters derived from the Soil and Water Assessment Tool and MODFLOW model. The geomorphological parameters were categorized, on the basis of groundwater recharge potential and weight ranged from 1 to 4. The geomorphologic parameters, that is, soil type (T), slope (S), runoff ratio (R), and evapotranspiration (ET) were integrated into a single indicator of composite hydrologic index. Soil type and ET were the major factors that directly affected the groundwater recharge. These two parameters together explained 86% of total variability in the data. Based on the analysis of the four parameters that affected groundwater recharge, composite hydrologic index (CHI) was classified into very good, good, moderate, and low grade. The CHI was statistically validated using standardization methods. The index was developed as a water management tool to measure a sustainability state relative to a groundwater recharge potential, which allows for spatial and temporal comparison. This index will be helpful in natural resource management and will improve socioeconomic status of human population inhibiting in the semi-arid region.
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Affiliation(s)
| | - D K Singh
- Indian Council of Agricultural Research-Indian Agricultural Research Institute, New Delhi, India
| | - A Sarangi
- Indian Council of Agricultural Research-Indian Agricultural Research Institute, New Delhi, India
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Pareek P, Singh DK, Rai R, Srivastava A, Maurya M. Abacavir-based Regimen for HIV-infected Children and Adolescents. Indian Pediatr 2019; 56:685-686. [PMID: 31477651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We studied 48 children receiving abacavir-based HAART regimen, over a period of one-year for side effects and failure rates. None of the children developed hypersensitivity reaction. The CD4 count significantly improved from the time of enrolment till 12 months of therapy while the failure rate was 14.5%.
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Affiliation(s)
- Prince Pareek
- Department of Pediatrics, MLN Medical College, Allahabad, Uttar Pradesh, India
| | - D K Singh
- Department of Pediatrics, MLN Medical College, Allahabad, Uttar Pradesh, India.
| | - Ruchi Rai
- Department of Pediatrics, MLN Medical College, Allahabad, Uttar Pradesh, India
| | - Anubha Srivastava
- Department of Pediatrics, MLN Medical College, Allahabad, Uttar Pradesh, India
| | - Manisha Maurya
- Department of Pediatrics, MLN Medical College, Allahabad, Uttar Pradesh, India
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Ramakrishnan N, Singh JK, Gupta SK, Bhalla V, Singh DK, Raina S, Kumari A. Tracheostomy: Open Surgical or Percutaneous? An Effort to Solve the Continued Dilemma. Indian J Otolaryngol Head Neck Surg 2019; 71:320-326. [PMID: 31559198 DOI: 10.1007/s12070-019-01684-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 05/17/2019] [Accepted: 06/04/2019] [Indexed: 10/26/2022] Open
Abstract
Due to lack of globally standardized guidelines and clarity on indications, patient selection, intra-operative preparations, technique, complications, postoperative care and decannulation protocols, percutaneous tracheostomy (PT) has come in vogue as compared to standard open surgical tracheostomy (OST). PercuTwist and guide wire dilatational method (GWDF), techniques of PT, offer lesser operative time and ease of surgery being a bedside procedure. There seems to be paucity of Indian literature on rising trend of increasing indications, post-operative care, management of complications and outcomes of tracheostomy. And thus, there arises a felt need to envisage a study in tertiary care setup targeting these issues and to question the so far unchallenged acceptance of new techniques and technology. Our aim is to study the recent trend of indications, complications, and outcomes of both OST and PT in a cohort of Indian patients who underwent tracheostomy. 80 patients with mean age of 59.0 ± 15 years underwent tracheostomy (OST: 48 (60%), PT: 32 (40%), and among PT, PercuTwist: 16 (50%), GWDF: 16 (50%)) for various indications with objectives to compare operative time, complications and decannulation rates of tracheostomy surgery, within the follow up period of 3 months. Most common indication of elective tracheostomy was prolonged ventilation, and for emergency ones, upper airway obstruction. Mean operative time taken by all the three techniques was comparable, i.e., 16.3 v/s 15 v/s 15.3 min (Open v/s PT GWDF v/s PT PercuTwist). Most common intra-operative complication of OST was haemorrhage (16.3%) and that of PT was false passage (8.8%). Early post-operative complications were haemorrhage (OST: 3.75%, PT: 1.25%) and tube blockage and dislodgement (equal distribution among OST and PT). Late post-operative complications were stomal granulations in PT: 7.5%. Outcomes of tracheostomy were significantly better with OST (36 (45%)) than PT (14 (17.5%)). In PT group, PercuTwist fared better than GWDF in terms of lesser complications (PercuTwist: 10%, GWDF: 18.6%) and better decannulation rates (PercuTwist: 13.6%, GWDF: 3.75%). Most common indication for tracheostomy remains prolonged intubation; complication of OST is intra and early post-operative haemorrhage and that of PT being tube dislodgement and blockage. Outcomes in form of successful decannulation are with OST.
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Affiliation(s)
- N Ramakrishnan
- Base Hospital, Lucknow Cantt, Lucknow, Uttar Pradesh 226002 India
| | - Jitendra Kumar Singh
- 2Department of ENT & HNS, Command Hospital (Eastern Command), Kolkata, West Bengal 700027 India
| | - Salil Kumar Gupta
- 2Department of ENT & HNS, Command Hospital (Eastern Command), Kolkata, West Bengal 700027 India
| | - Vijay Bhalla
- 2Department of ENT & HNS, Command Hospital (Eastern Command), Kolkata, West Bengal 700027 India
| | - D K Singh
- 2Department of ENT & HNS, Command Hospital (Eastern Command), Kolkata, West Bengal 700027 India
| | - Sheetal Raina
- 2Department of ENT & HNS, Command Hospital (Eastern Command), Kolkata, West Bengal 700027 India
| | - Abha Kumari
- 2Department of ENT & HNS, Command Hospital (Eastern Command), Kolkata, West Bengal 700027 India
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Dash CJ, Sarangi A, Singh DK, Adhikary PP. Numerical simulation to assess potential groundwater recharge and net groundwater use in a semi-arid region. Environ Monit Assess 2019; 191:371. [PMID: 31102073 DOI: 10.1007/s10661-019-7508-y] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 04/30/2019] [Indexed: 06/09/2023]
Abstract
Accurate assessment of deep percolation (potential groundwater recharge) under different field crops is essential for sustainable management of scarce water resources and proper planning of crop rotation in irrigated, semi-arid regions of the world. The potential recharge from commonly grown field crops in semi-arid Indo-Gangetic Plain (IGP) of India was estimated using HYDRUS-1D model, where, irrigation, evapotranspiration, and soil moisture dynamics were simulated. Simultaneously, net groundwater use by different cropping patterns was also calculated. Among the hydraulic parameters, n was found most sensitive for water percolation. During rainy season, 293.8 and 159.1 mm water was percolated below the root zone of cotton and soybean, respectively, which accounted for 39.4 and 32.9% of the water input. During winter season, 66.8 and 30.3 mm water was percolated below the root zone of winter maize and mustard, respectively, accounting for 20.5 and 10.6% of added water. It was observed that net groundwater use was positive for cotton, soybean, and summer maize with the values of 168.8, 159.1, and 18.0 mm year-1, respectively, and negative for rice, wheat, winter maize, and mustard. For the eight most important cropping patterns of semi-arid IGP, the net groundwater use was negative and varied between - 4.4 mm year-1 for cotton-maize and -423 mm year-1 for rice-wheat. With these cropping patterns, the overall rate of decline of groundwater was 231 mm year-1. It was found that maize-wheat and soybean-wheat cropping patterns consume much less water than rice-wheat cropping pattern and therefore are suitable to arrest the declining trend of groundwater in semi-arid IGP of India.
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Affiliation(s)
- Ch Jyotiprava Dash
- ICAR-Indian Institute of Soil and Water Conservation, Research Centre, Sunabeda, Koraput, Odisha, 763002, India
| | - A Sarangi
- Water Technology Centre, ICAR-Indian Agricultural Research Institute, PUSA, New Delhi, 110012, India
| | - D K Singh
- Water Technology Centre, ICAR-Indian Agricultural Research Institute, PUSA, New Delhi, 110012, India
| | - P P Adhikary
- ICAR-Indian Institute of Soil and Water Conservation, Research Centre, Sunabeda, Koraput, Odisha, 763002, India.
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Singh DK, Gupta SK, Bhalla V, Raina S, Kumari A. Clinical Study to Determine Occult Vestibular Dysfunction in Patients of Chronic Otitis Media using Computerized Static Posturography. BJOHNS 2019. [DOI: 10.47210/bjohns.2019.v27i1.223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Introduction
Various studies have shown high incidence of subjective vestibular dysfunction in cases of chronic otitis media (COM). Evaluation of vestibular dysfunction in chronic otitis media patients is becoming an integral part of comprehensive management of COM. In our study, we have evaluated vestibular dysfunction in patients with COM, using computerized static posturography, an objective technique in contrast to other subjective tests of vestibular dysfunction.
Materials and Methods
In this prospective case control study done over a period of 1.5 years, 50 cases of COM and 50 healthy controls were included and they underwent Computerized Static Posturography. Parameters taken were Somaesthetic, visual and vestibular scores in both antero-posterior (AP) and medio-lateral (ML) axis; and in combined axis (Antero-posterior +Medio-lateral) and these scores were compared with those of healthy controls.
Results
Total 50 cases of COM (average disease period - 5.7 years), of both sexes, with age range of 15-60 years and mean age of 31.58 years were taken. On analyzing above mentioned parameters using SPSS software, we found no significant difference in vestibular function in cases of COM as compared with healthy individuals.
Discussion
The outcome of computerized static posturography can be quantified with respect to changes in center-of-force sway amplitude, distance, or velocity, which, by virtue of not being burdened by subjective interpretation, its results can be, documented both graphically and numerically.
Conclusion
This study, further solidified with objective evidence, raises a question on COM without complications being directly responsible for vestibular dysfunction.
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Chauhan PS, Singh DK, Dash D, Singh R. Intranasal curcumin regulates chronic asthma in mice by modulating NF-ĸB activation and MAPK signaling. Phytomedicine 2018; 51:29-38. [PMID: 30466625 DOI: 10.1016/j.phymed.2018.06.022] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 05/04/2018] [Accepted: 06/18/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Curcumin, a natural product found in the plant Curcuma longa, has been reported to have diverse range of molecular targets that influence numerous biochemical and molecular cascades including anti-inflammatory and antioxidant properties. PURPOSE The aim of the study was to investigate the therapeutic potential of intranasal curcumin on ovalbumin (OVA)-induced chronic asthma and to elucidate underlying molecular mechanisms. STUDY DESIGN/METHOD Mice were sensitized and exposed to 2% OVA aerosol for 2 times in a week for five consecutive weeks to study effect of intranasal curcumin on various MAPK pathway enzymes involved in chronic asthma and its effect on the activation of nuclear factor kB (NF-kB). RESULTS Curcumin treatment decreased the ROS level in BALF and nitrite level in blood serum of chronic asthmatic mice. Curcumin treatment had significantly decreased the phosphorylation of JNK, ERK1/2, and p38 and COX-2 expression thereby nuclear factor κB (NF-κB) activation and expression in lung tissues. CONCLUSION These results suggest that intranasal curcumin protects against asthma via action on mitogen-activated protein kinase (MAPK)/NF-κB signaling pathways.
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Affiliation(s)
- Preeti S Chauhan
- Department of Zoology, MMV Unit, Banaras Hindu University, India
| | - D K Singh
- Department of Physics, Udai Pratap Autonomous College, Varanasi, India
| | - D Dash
- Department of Biochemistry, Institute of Medical Sciences Banaras Hindu University, Varanasi 221005, India
| | - Rashmi Singh
- Department of Zoology, MMV Unit, Banaras Hindu University, India.
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Stock C, Rodriguez-Rivera JA, Schmalzl K, Demmel F, Singh DK, Ronning F, Thompson JD, Bauer ED. From Ising Resonant Fluctuations to Static Uniaxial Order in Antiferromagnetic and Weakly Superconducting CeCo(In_{1-x}Hg_{x})_{5}(x=0.01). Phys Rev Lett 2018; 121:037003. [PMID: 30085774 DOI: 10.1103/physrevlett.121.037003] [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] [Received: 02/01/2018] [Indexed: 06/08/2023]
Abstract
CeCo(In_{0.990}Hg_{0.010})_{5} is a charge doped variant of the d-wave CoCoIn_{5} superconductor with coexistent antiferromagnetic and superconducting transitions occurring at T_{N}=3.4 and T_{c}=1.4 K, respectively. We use neutron diffraction and spectroscopy to show that the magnetic resonant fluctuations present in the parent superconducting phase are replaced by collinear c-axis magnetic order with three-dimensional Ising critical fluctuations. No low-energy transverse spin fluctuations are observable in this doping-induced antiferromagnetic phase and the dynamic resonant spectral weight predominately shifts to the elastic channel. Static (τ>0.2 ns) collinear Ising order is proximate to superconductivity in CeCoIn_{5} and is stabilized through hole doping with Hg.
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Affiliation(s)
- C Stock
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - J A Rodriguez-Rivera
- NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
- Department of Materials Science, University of Maryland, College Park, Maryland 20742, USA
| | - K Schmalzl
- Forschungszentrum Juelich GmbH, Juelich Centre for Neutron Science at ILL, 71 avenue des Martyrs, 38000 Grenoble, France
| | - F Demmel
- ISIS Facility, Rutherford Appleton Labs, Chilton, Didcot OX11 0QX, United Kingdom
| | - D K Singh
- Department of Physics and Astronomy, University of Missouri, Missouri 65211, USA
| | - F Ronning
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J D Thompson
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - E D Bauer
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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Singh DK, Lee HK, Dweikat I, Mysore KS. An efficient and improved method for virus-induced gene silencing in sorghum. BMC Plant Biol 2018; 18:123. [PMID: 29914379 PMCID: PMC6006947 DOI: 10.1186/s12870-018-1344-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 06/06/2018] [Indexed: 05/08/2023]
Abstract
BACKGROUND Although the draft genome of sorghum is available, the understanding of gene function is limited due to the lack of extensive mutant resources. Virus-induced gene silencing (VIGS) is an alternative to mutant resources to study gene function. This study reports an improved and efficient method for Brome mosaic virus (BMV)-based VIGS in sorghum. METHODS Sorghum plants were rub-inoculated with sap prepared by grinding 2 g of infected Nicotiana benthamiana leaf in 1 ml 10 mM potassium phosphate buffer (pH 6.8) and 100 mg of carborundum abrasive. The sap was rubbed on two to three top leaves of sorghum. Inoculated plants were covered with a dome to maintain high humidity and kept in the dark for two days at 18 °C. Inoculated plants were then transferred to 18 °C growth chamber with 12 h/12 h light/dark cycle. RESULTS This study shows that BMV infection rate can be significantly increased in sorghum by incubating plants at 18 °C. A substantial variation in BMV infection rate in sorghum genotypes/varieties was observed and BTx623 was the most susceptible. Ubiquitin (Ubiq) silencing is a better visual marker for VIGS in sorghum compared to other markers such as Magnesium Chelatase subunit H (ChlH) and Phytoene desaturase (PDS). The use of antisense strand of a gene in BMV was found to significantly increase the efficiency and extent of VIGS in sorghum. In situ hybridization experiments showed that the non-uniform silencing in sorghum is due to the uneven spread of the virus. This study further demonstrates that genes could also be silenced in the inflorescence of sorghum. CONCLUSION In general, sorghum plants are difficult to infect with BMV and therefore recalcitrant to VIGS studies. However, by using BMV as a vector, a BMV susceptible sorghum variety, 18 °C for incubating plants, and antisense strand of the target gene fragment, efficient VIGS can still be achieved in sorghum.
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Affiliation(s)
| | - Hee-Kyung Lee
- Noble Research Institute, Ardmore, Oklahoma 73401 USA
| | - Ismail Dweikat
- Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, Nebraska 68583 USA
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Singh DK, Kumar B, Shrinet G, Singh RP, Das A, Mantur BG, Pandey A, Mondal P, Sajjanar BK, Doimari S, Singh V, Kumari R, Tiwari AK, Gandham RK. Draft genome sequence of field isolate Brucella melitensis strain 2007BM/1 from India. J Glob Antimicrob Resist 2018; 13:152-153. [PMID: 29684575 DOI: 10.1016/j.jgar.2018.04.008] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 04/11/2018] [Accepted: 04/12/2018] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES Brucellosis is among one of the most widespread important global zoonotic diseases that is endemic in many parts of India. Brucella melitensis is supposed to be the most pathogenic species for humans. Here we report the draft genome sequence of B. melitensis strain 2007BM/1 isolated from a human in India. METHODS Genomic DNA was extracted from Brucella culture and was sequenced using an Illumina MiSeq platform. The generated reads were assembled using three de novo assemblers and the draft genome was annotated. RESULTS This monoisolate, with a genome length of 3268756bp, was found to be resistant to azithromycin and trimethoprim/sulfamethoxazole but susceptible to tetracycline, ofloxacin, rifampicin, ciprofloxacin and doxycycline. The presence of virulence genes in the strain was identified. CONCLUSIONS The results obtained will help in understanding drug resistance mechanisms and virulence factors in highly zoonotic B. melitensis and suggest the need for judicious use of antibiotics in livestock health and management practices.
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Affiliation(s)
- D K Singh
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India.
| | - Bablu Kumar
- Division of Biological Products, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Garima Shrinet
- Division of Biological Products, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - R P Singh
- Division of Biological Products, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Aparajita Das
- Division of Biological Products, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - B G Mantur
- Department of Microbiology, Belgaum Institute of Medical Sciences, District Hospital Campus, Belgaum 590 001, Karnataka, India
| | - Aruna Pandey
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Piyali Mondal
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - B K Sajjanar
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Soni Doimari
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Vijayata Singh
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Reena Kumari
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - A K Tiwari
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
| | - Ravi Kumar Gandham
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Izzatnagar, Bareilly 243122, Uttar Pradesh, India
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Rajput P, Singh DK, Singh AK, Gupta T. Chemical composition and source-apportionment of sub-micron particles during wintertime over Northern India: New insights on influence of fog-processing. Environ Pollut 2018; 233:81-91. [PMID: 29055838 DOI: 10.1016/j.envpol.2017.10.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 09/25/2017] [Accepted: 10/09/2017] [Indexed: 06/07/2023]
Abstract
A comprehensive study was carried out from central part of Indo-Gangetic Plain (IGP; at Kanpur) to understand abundance, temporal variability, processes (secondary formation and fog-processing) and source-apportionment of PM1-bound species (PM1: particulate matter of aerodynamic diameter ≤ 1.0 μm) during wintertime. A total of 50 PM1 samples were collected of which 33 samples represent submicron aerosol characteristics under non-foggy condition whereas 17 samples represent characteristics under thick foggy condition. PM1 mass concentration during non-foggy episodes varied from 24-393 (Avg.: 247) μg m-3, whereas during foggy condition it ranged from 42-243 (Avg.: 107) μg m-3. With respect to non-foggy condition, the foggy conditions were associated with higher contribution of PM1-bound organic matter (OM, by 23%). However, lower fractional contribution of SO42-, NO3- and NH4+ during foggy conditions is attributable to wet-scavenging owing to their high affinity to water. Significant influence of fog-processing on organic aerosols composition is also reflected by co-enhancement in OC/EC and WSOC/OC ratio during foggy condition. A reduction by 5% in mineral dust fraction under foggy condition is associated with a parallel decrease in PM1 mass concentration. However, mass fraction of elemental carbon (EC) looks quite similar (≈3% of PM1) but the mass absorption efficiency (MAE) of EC is higher by 30% during foggy episodes. Thus, it is evident from this study that fog-processing leads to quite significant enhancement in OM (23%) contribution (and MAE of EC) with nearly equal and parallel decrease in SO42-, NO3- and NH4+ and mineral dust fractions (totaling to 24%). Characteristic features of mineral dust remain similar under foggy and non-foggy conditions; inferred from similar ratios of Fe/Al (≈0.3), Ca/Al (0.35) and Mg/Al (0.22). Positive matrix factorization (PMF) resolves seven sources: biomass burning (19.4%), coal combustion (1.1%), vehicular emission (3%), industrial activities (6.1%), leather tanneries (4%), secondary transformations (46.2%) and mineral dust (20.2%).
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Affiliation(s)
- Prashant Rajput
- Department of Civil Engineering and APTL at Center for Environmental Science and Engineering (CESE), Indian Institute of Technology Kanpur, Kanpur, 208 016, India; Global Centre for Clean Air Research (GCARE), Department of Civil and Environmental Engineering, University of Surrey, Guildford, GU2 7XH, UK
| | - Dharmendra Kumar Singh
- Department of Civil Engineering and APTL at Center for Environmental Science and Engineering (CESE), Indian Institute of Technology Kanpur, Kanpur, 208 016, India; NUS Environmental Research Institute (NERI), National University of Singapore, #02-01, T-Lab Building 5A Engineering Drive 1, 117411, Singapore
| | - Amit Kumar Singh
- Department of Civil Engineering and APTL at Center for Environmental Science and Engineering (CESE), Indian Institute of Technology Kanpur, Kanpur, 208 016, India
| | - Tarun Gupta
- Department of Civil Engineering and APTL at Center for Environmental Science and Engineering (CESE), Indian Institute of Technology Kanpur, Kanpur, 208 016, India.
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James A, Singh DK, Khankhane PJ. Enhanced atrazine removal by hydrophyte-bacterium associations and in vitro screening of the isolates for their plant growth-promoting potential. Int J Phytoremediation 2018; 20:89-97. [PMID: 28598215 DOI: 10.1080/15226514.2017.1337068] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Emergent hydrophytes Acorus calamus, Typha latifolia, and Phragmites karka and epiphytic root bacteria isolated from their rhizoplanes were exposed to atrazine (5 and 10 mg l-1) individually and in plant-bacterium combination for 15 days hydroponically. It was observed that A. calamus-Pseudomonas sp. strain, the ACB combination, was best in decontamination, showing 91% and 87% removal of 5 and 10 mg l-1 atrazine. Plant-bacterium association led to significant increase in atrazine decontamination as compared to decontamination by either plant or bacterium alone, indicating a synergistic action of the hydrophytes and isolates which led to enhanced atrazine removal. To the best of our knowledge this is the first report on the potential of plant-bacterium combinations for atrazine decontamination. The isolates showed augmented growth in the presence of plants and were able to alleviate atrazine stress in them. These isolates exhibited plant growth-promoting traits such as auxin, siderophore, Poly(3-hydroxybutyric acid)/succinogycan, ammonia, catalase production and solubilization of inorganic phosphate in vitro. The use of plant-bacterium mutualistic symbiosis for atrazine mitigation is a relatively simple, inexpensive, and clean technique and this phytoremediation-rhizoremediation combination is suggested to be tried on field to establish their potential for clean-up of contaminated sites.
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Affiliation(s)
- Anina James
- a Department of Zoology , University of Delhi , Delhi , India
| | - D K Singh
- a Department of Zoology , University of Delhi , Delhi , India
| | - P J Khankhane
- b Directorate of Weed Research , Jabalpur , Madhya Pradesh , India
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Mahato MK, Singh DK, Rana HB, Acharya KP. Prevalence and risk factors associated with Giardia duodenalis infection in dairy cattle of Chitwan, Nepal. J Parasit Dis 2018; 42:122-126. [PMID: 29491570 DOI: 10.1007/s12639-017-0975-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 06/21/2017] [Accepted: 12/21/2017] [Indexed: 10/18/2022] Open
Abstract
Livestock farming has been an integral part of Nepalese agriculture systems since time immemorial. Giardia duodenalis is a cosmopolitan intestinal parasite present in a wide range of hosts. Very little or no information is reported on the prevalence of giardiasis in livestock of Nepal. This study was done during Jan 18 to July 19, 2014 to determine the prevalence and associated risk factors of Giardia duodenalis infection in dairy cattle of Chitwan, Nepal. A total of 96 fresh fecal samples were collected from various dairy pocket areas and were transferred to collection bottles with 10% formalin. Wet smears of the samples were prepared, stained with lugol's iodine and then viewed under microscope at 400× magnification. The overall prevalence was found to be 44.79% (43/96). Based on the risk factors assessment survey, age was found to be significantly associated with the prevalence of Giardia duodenalis. The prevalence was found significantly (P < 0.05) higher in 1-6 months age group compared to > 3 years. Similarly, higher prevalence was found in diarrheic animals compared to their counterparts (P < 0.05). Though higher prevalence was recorded in unhygienically housed animals, it was statistically non-significant (P < 0.05). Giardiasis should be considered as an important cause of diarrhea and further advanced diagnostic approaches should be employed for the confirmation of giardiasis in dairy cattle.
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Affiliation(s)
- M K Mahato
- 1Agriculture and Forestry University (AFU), Rampur, Chitwan, Nepal
| | - D K Singh
- Institute of Agriculture and Animal Sciences (IAAS), Rampur, Chitwan, Nepal
| | - H B Rana
- Institute of Agriculture and Animal Sciences (IAAS), Rampur, Chitwan, Nepal
| | - K P Acharya
- Institute of Agriculture and Animal Sciences (IAAS), Rampur, Chitwan, Nepal.,Regional Veterinary Diseases Diagnostic Laboratory (RVDDL), Pokhara, Nepal
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Bandi MM, Akella VS, Singh DK, Singh RS, Mandre S. Hydrodynamic Signatures of Stationary Marangoni-Driven Surfactant Transport. Phys Rev Lett 2017; 119:264501. [PMID: 29328684 DOI: 10.1103/physrevlett.119.264501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Indexed: 06/07/2023]
Abstract
We experimentally study steady Marangoni-driven surfactant transport on the interface of a deep water layer. Using hydrodynamic measurements, and without using any knowledge of the surfactant physicochemical properties, we show that sodium dodecyl sulphate and Tergitol 15-S-9 introduced in low concentrations result in a flow driven by adsorbed surfactant. At higher surfactant concentration, the flow is dominated by the dissolved surfactant. Using camphoric acid, whose properties are a priori unknown, we demonstrate this method's efficacy by showing its spreading is adsorption dominated.
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Affiliation(s)
- M M Bandi
- Collective Interactions Unit, OIST Graduate University, Okinawa 904-0495, Japan
| | - V S Akella
- Collective Interactions Unit, OIST Graduate University, Okinawa 904-0495, Japan
| | - D K Singh
- Collective Interactions Unit, OIST Graduate University, Okinawa 904-0495, Japan
| | - R S Singh
- School of Engineering, Brown University, Providence, Rhode Island 02912, USA
| | - S Mandre
- School of Engineering, Brown University, Providence, Rhode Island 02912, USA
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Summers B, Chen Y, Dahal A, Singh DK. New Description of Evolution of Magnetic Phases in Artificial Honeycomb Lattice. Sci Rep 2017; 7:16080. [PMID: 29167461 PMCID: PMC5700068 DOI: 10.1038/s41598-017-15786-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 08/29/2017] [Accepted: 11/01/2017] [Indexed: 11/08/2022] Open
Abstract
Artificial magnetic honeycomb lattice provides a two-dimensional archetypal system to explore novel phenomena of geometrically frustrated magnets. According to theoretical reports, an artificial magnetic honeycomb lattice is expected to exhibit several phase transitions to unique magnetic states as a function of reducing temperature. Experimental investigations of permalloy artificial honeycomb lattice of connected ultra-small elements, [Formula: see text] 12 nm, reveal a more complicated behavior. First, upon cooling the sample to intermediate temperature, [Formula: see text] 175 K, the system manifests a non-unique state where the long range order co-exists with short-range magnetic charge order and weak spin ice state. Second, at much lower temperature, [Formula: see text] 6 K, the long-range spin solid state exhibits a re-entrant behavior. Both observations are in direct contrast to the present understanding of this system. New theoretical approaches are needed to develop a comprehensive formulation of this two dimensional magnet.
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Affiliation(s)
- B Summers
- Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
| | - Y Chen
- Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
| | - A Dahal
- Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
| | - D K Singh
- Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA.
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