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Memon SS, Srivastava P, Karlekar M, Thakkar H, Bandgar T. Ambulatory blood pressure monitoring in pheochromocytoma - paraganglioma: A single center experience. J Postgrad Med 2024; 70:84-90. [PMID: 37555422 DOI: 10.4103/jpgm.jpgm_208_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: 03/21/2023] [Accepted: 05/02/2023] [Indexed: 08/10/2023] Open
Abstract
CONTEXT/AIMS Pheochromocytoma and paraganglioma (PPGL) are rare tumors, and data on ambulatory blood pressure monitoring (ABPM) in these patients and the effect of blocking on ABPM parameters is limited. We aimed to describe ABPM parameters in a cohort of PPGL at our center in western India. METHODS Retrospective study of patients with PPGL whose ABPM data was available. Demographic details, secretory status, and ABPM data were retrieved. Coefficient of variability (CV) was calculated as standard deviation/mean in percentage. RESULTS In the 39 included patients, mean age at presentation was 39.3 ± 14.2 yr; 20 (51.3%) were males, 25 (64.1%) hypertensive, and mean tumor diameter was 5.3 cm. In 18 patients whose baseline ABPM was done without medications, those with nocturnal blood pressure dipping (6/18, 33%) had higher serum metanephrines (median 313.2 vs. 34.7 pg/ml, P = 0.028). Despite normal office blood pressure (BP), 8.9% of systolic BP readings were >140 mmHg, and 1.2% were >160 mmHg. Among 29 patients with both pre and post-block ABPM, mean BP (systolic 121.6 vs. 132.5 mmHg, P = 0.014; diastolic 68.9 vs. 76.4 mmHg, P = 0.005) and percentage of BP readings above 140 mmHg (median 9.4% vs. 24.4%, P = 0.016) were significantly lowered after the preoperative blockade in hypertensive ( n = 19) patients, whereas CV was similar. The post-blockade ABPM characteristics were similar in patients blocked with amlodipine or prazosin. CONCLUSION ABPM provides additional information about BP characteristics in PPGL. The preoperative blocking decreases the magnitude of BP excursions but does not affect BP variability.
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Affiliation(s)
- S S Memon
- Department of Endocrinology, Seth GS Medical College and KEM Hospital, Mumbai, Maharashtra, India
| | - P Srivastava
- Department of Endocrinology, Seth GS Medical College and KEM Hospital, Mumbai, Maharashtra, India
| | - M Karlekar
- Department of Endocrinology, Seth GS Medical College and KEM Hospital, Mumbai, Maharashtra, India
| | - H Thakkar
- Department of Radiology, Seth GS Medical College and KEM Hospital, Mumbai, Maharashtra, India
| | - T Bandgar
- Department of Endocrinology, Seth GS Medical College and KEM Hospital, Mumbai, Maharashtra, India
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Kumar P, Parashar M, Chauhan K, Chakraborty N, Sarkar S, Chandra A, Das NS, Chattopadhyay KK, Ghoari A, Adalder A, Ghorai UK, Saini S, Agarwal D, Ghosh S, Srivastava P, Banerjee D. Significant enhancement in the cold emission characteristics of chemically synthesized super-hydrophobic zinc oxide rods by nickel doping. Nanoscale Adv 2023; 5:6944-6957. [PMID: 38059027 PMCID: PMC10696928 DOI: 10.1039/d3na00776f] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 10/28/2023] [Indexed: 12/08/2023]
Abstract
The current article presents a huge enhancement in the field emission characteristics of zinc oxide (ZnO) micro/nanorods by nickel doping. The synthesis of pure and nickel-doped zinc oxide (ZnO) micro/nanorods was done by a simple low-temperature chemical method. Both the as-prepared pure and doped samples were analyzed by X-ray diffraction and electron microscopy to confirm the proper phase formation and the developed microstructure. UV-vis transmittance spectra helped in determining the band gap of the samples. Fourier-Transform Infrared Spectroscopy (FTIR) spectra showed the different bonds present in the sample, whereas X-ray Photoelectron Spectroscopy (XPS) confirmed the presence of nickel in the doped sample. Photoluminescence (PL) spectra showed that after doping, the band-to-band transition was affected, whereas defect-induced transition had increased significantly. After the nickel doping, contact angle measurement revealed a significant decrease in the sample's surface energy, leading to a remarkably high water contact angle (within the superhydrophobic region). Simulation through ANSYS suggested that the doped sample has the potential to function as an efficient cold emitter, which was also verified experimentally. The cold emission characteristics of the doped sample showed a significant improvement, with the turn-on field (corresponding to J = 1 μA cm-2) reduced from 5.34 to 2.84 V μm-1. The enhancement factor for the doped sample reached 3426, approximately 1.5 times higher compared to pure ZnO. Efforts have been made to explain the results, given the favorable band bending as well as the increased number of effective emission sites.
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Affiliation(s)
- P Kumar
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
| | - M Parashar
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
| | - K Chauhan
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
| | - N Chakraborty
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - S Sarkar
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - A Chandra
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - N S Das
- Department of Basic Science and Humanities, Techno International Batanagar Maheshtala Kolkata 700141 India
| | - K K Chattopadhyay
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - A Ghoari
- Department of Industrial Chemistry, Ramakrishna Mission Vidyamandira Belur Math Howrah-711202 India
| | - A Adalder
- Department of Industrial Chemistry, Ramakrishna Mission Vidyamandira Belur Math Howrah-711202 India
| | - U K Ghorai
- Department of Industrial Chemistry, Ramakrishna Mission Vidyamandira Belur Math Howrah-711202 India
| | - S Saini
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - D Agarwal
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - S Ghosh
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - P Srivastava
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - D Banerjee
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
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Srivastava P, Zhang X, Moriguchi J, Chang D, Czer L, Cole R, Kittleson M, Kransdorf E, Kobashigawa J, Patel J. Extreme HLA Homozygosity Contributing to Extreme HLA Sensitization. J Heart Lung Transplant 2023. [DOI: 10.1016/j.healun.2023.02.452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
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Srivastava P, Kransdorf E, Kittleson M, Chang D, Nikolova A, Patel J, Kobashigawa J. Mixed Rejection in Orthotopic Heart Transplantation. J Heart Lung Transplant 2023. [DOI: 10.1016/j.healun.2023.02.1105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
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Morthekai P, Tiwari P, Murari M, Singh P, Thakur B, Manoj M, Ali S, Singh V, Kumar K, Rai J, Dubey N, Srivastava P. Further investigations towards luminescence dating of diatoms. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Patel S, Ramchand J, Kearney L, Srivastava P, Burrell L. Reduced Gene Expression and Genetic Variation in Kruppel-Like Factor 15 Are Associated with Left Ventricular Hypertrophy and All-Cause Mortality in Patients with Aortic Stenosis. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Doumtsis N, Patel S, Ramchand J, Lu K, Srivastava P, Patel S, Burrell L. Circulating Angiotensin Converting Enzyme 2 Activity in Hospitalised Patients With Acute Heart Failure. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Srivastava P, May-Miller H, Gilroy JA, Blackie K, Worku D, Siddiqui N, Tweddle A, Droney J, Gruber P. 1442O Proactive early palliative care referral for cancer patients in the intensive care unit: Implementing a novel “triggers” checklist. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Srivastava P, Shetty P, Shetty S, Upadya M, Nandan A. Impact of Noise in Operating Theater: A Surgeon's and Anesthesiologist's Perspective. J Pharm Bioallied Sci 2021; 13:S711-S715. [PMID: 34447187 PMCID: PMC8375903 DOI: 10.4103/jpbs.jpbs_656_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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 11/18/2020] [Indexed: 11/04/2022] Open
Abstract
Background and Aims Noise is often considered as an undesirable sound. Excess noise is a health threat that deteriorates one's concentration and communication. Noise in the operating theater can be disturbing, impairs communication, and can lead to stress. The aim of this survey was to assimilate information about the perspective of surgeons and anesthesiologists regarding noise in the operating theater and whether it affects their work atmosphere. Methods A questionnaire consisting of 15 closed-ended questions excluding one open-ended question was given to surgeons from various specialties and anesthesiologists. The subjective response were analyzed and documented. Data analysis was done using descriptive statistics. Association was found out using Chi-square test. Results We collected a total of 290 responses, of which 87.6% (n = 254) considered noise to increase the stress level and deteriorates the quality of teamwork (83.8%, n = 243). Noise affects communication among the staff (86.2%, n = 250) and decreases their concentration level (85.5%, n = 248) which could be harmful in view of the patient's safety. 87.9% (n = 255) of the participants were in favor of limiting the number of people in the operating theater. Nonetheless, 73% (n = 211) considered music has a calming effect and were in favor of music in the operating theater. Conclusion Noise in the operating theater can have distressing effects on surgeons, jeopardizing the patient's safety. However, a flip side to this is that music is considered to have a calming and soothing effect decreasing the anxiety and stress levels.
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Affiliation(s)
- Pritika Srivastava
- Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
| | - Premalatha Shetty
- Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
| | - Sameep Shetty
- Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
| | - Madhusudan Upadya
- Department of Anesthesiology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
| | - Aditya Nandan
- Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
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Toner L, Chen J, Ramchand J, O'Donnell D, Srivastava P, Calafiore P, Jones E. Biventricular Function is Impaired in RV Septal Pacing – A Prospective Study Using Myocardial Strain Imaging. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pararajasingam A, Atwan A, Srivastava P, Chowdhury MMU, Stone NM. Shades of grey: an outbreak of tattoo-associated Mycobacterium chelonae. Br J Dermatol 2020; 184:e54. [PMID: 32875558 DOI: 10.1111/bjd.19487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/27/2020] [Accepted: 07/27/2020] [Indexed: 11/28/2022]
Affiliation(s)
- A Pararajasingam
- Department of Dermatology, Aneurin Bevan University Health Board, Newport, UK
| | - A Atwan
- Department of Dermatology, Aneurin Bevan University Health Board, Newport, UK
| | - P Srivastava
- Department of Dermatology, University Hospital of Wales, Cardiff, UK
| | - M M U Chowdhury
- Department of Dermatology, University Hospital of Wales, Cardiff, UK
| | - N M Stone
- Department of Dermatology, Aneurin Bevan University Health Board, Newport, UK
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Jain N, Pandya S, Srivastava P, Chotalia P, Moorthy A. AB0694 IS THERE ANY HETEROGENEITY OF SPONDYLOARTHRITIS DISEASE MANIFESTATIONS BETWEEN TWO ETHNIC SUBGROUPS?:A MULTICENTRE INTERNATIONAL COMPARATIVE STUDY BETWEEN INDIA AND UK. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.6497] [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: 11/04/2022]
Abstract
Background:Pathogenesis of Spondyloarthritis (SpA) multifactorial and remains unclear. Various hypothesis have been postulated genetics, HLAB27, IL17, Gut microbiome and Biomechanical stress. Many of these factors can be attributed to ethnic background and environment. HLAB27 accounts for 20–25 % of total heritability and 40% of genetic risk while <10% of HLA-B27 carriers in general population develop SpA1. Higher faecal calprotectin levels in SpA compared to control point towards microscopic gut inflammation2. Thus dietary habits and geographical factors can influence pathogenesis of disease. We looked in clinical manifestations of SpA patients of two very different ethnic background Caucasians and Indians from UK and India to shed more light in understanding the diseaseObjectives:To study any differences in the clinical manifestations of SpA patients of two ethnic groupsTo compare outcome measure (BASDAI and ASDAS) between Caucasians and IndiansTo study the difference in disease activity between Indian patients and British AsiansMethods:Multicentre observation study where data of SpA patients attending rheumatology clinics from two major teaching hospitals collected. In India data collected from Sheth VS Hospital and NHL Medical College, Gujarat and in United Kingdom from University Hospitals Leicester, NHS trust. Leicester has a multi-ethnic demography wherein almost 30%3of population is of south Asian ethnicity, making this study unique.Baseline demographic and clinical data was collected. Clinical and outcome measures compared to see any heterogeneity in disease manifestations. SPSS software usedResults:Total 200 patients analysed with 148 Indians and 52 Caucasians. The Indian cohort was subdivided into British Asians (second generation Indians) and those form Gujarat, IndiaWe found Indian subgroups were younger with shorter disease duration. Comparison in Table 1Table 1.CaucasianIndianPAge45.9±1231±12<0.001M:F34:193:10.74TDI years9.6 ±5.93.5± 5.2<0.001BASDAI4.05±2.173.1±1.70.002ASDAS2±0.82.4±1.20.02CRP12.8±23.624±12<0.001HLAB2767%26%<0.001Uveitis25%12%0.02IBP78%90%0.03Enthesitis21%60%<0.001Peripheral Arthritis19%36%0.02Dactylitis2%10%0.07Psoriasis10%20%0.1IBD2%5%0.35Comparing British Asians to Indians, Gujarat no significant difference in clinical parameters. (Table 2)British AsianIndianPBASDAI5.16±2.763.1±1.70.006ASDAS2.53±1.32.4±1.20.74CRP15.2 ±15.424±12<0.001Conclusion:We found Caucasians had more HLAB27 positivity and extra-articular manifestation of uveitis however the Indian population has more enthesitis and peripheral arthritis. Enthesitis is initiated during a mechano-sensation and the cultural difference including style of footwear could probably be one of the factors explaining our findings inflammatory back pain has been reported to be higher in Indians compared to Caucasians which could be due to life styleThe fact that ASDAS CRP behaves similarly in Indian patients across the two countries and is more when compared to Caucasians might point towards overall higher burden of disease in Indian populationTo our knowledge this is a first study comparing clinical manifestations of SpA between Indians and CaucasiansReferences:[1]Brown MAet al. Susceptibility to ankylosing spondylitis in twins: the role of genes, HLAand environment.Arthritis Rheum 1997;40: 1823–8[2]J Simione, et al. Fecal Calprotectin, GutInflammation and SpA Archives of Medical Research. 2019;50:41-46[3]http://www.ons.gov.uk/censusDisclosure of Interests:Nibha Jain: None declared, Sapan Pandya: None declared, Puja Srivastava: None declared, Prashant Chotalia: None declared, Arumugam Moorthy Speakers bureau: Abbvie, Novartis,UCB,MSD
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Srivastava P, Kumar P, Tiwari AK. Design, Synthesis, and In Silico Evaluation of Methyl 2-(2-(5-Bromo/chloro-2-oxobenzoxazol-3(2H)-yl)-acetamido)-3-phenylpropanoate for TSPO Targeting. Radiochemistry 2020. [DOI: 10.1134/s1066362220010142] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
A cross sectional study was done at Era's Lucknow Medical College & Hospital, Lucknowwith the objective to evaluate 25-hydroxyVitaminD3 level in women with and without uterine fibroid. Ninety subjects (45 cases and 45 controls) were enrolled. Cases were those having at least 1 uterine fibroid ≥10 mm detected on ultrasonography, while controls were those not having any uterine pathology. Estimation of Serum 25-hydroxyvitaminD3 Level was done. The mean ± SD concentration of 25-hydroxyvitaminD3 was Significantly lower in cases compared with controls (15.10 ± 6.09 vs 26.09 ± 7.90 respectively, p < 0.001).The number of women with 25-hydroxyvitaminD3 deficiency in cases and controls was 9(20%) and 3(6.67%) respectively (p < 0.001). Uterine fibroid size increased proportionately with decrease in 25-hydroxyvitaminD3 levels, (p = 0.014). We concluded that VitaminD3 deficiency is significantly associated with the occurrence of Uterine fibroids. Further studies need to be conducted in order to evaluate the therapeutic benefits VitaminD3 supplementation in the patients of Uterine fibroid.Impact Statementwhat is already known on this subject? Vitamin D is believed to regulate cell proliferation and differentiation, inhibit angiogenesis and stimulate apoptosis. Now a days hypovitaminosis D is believed to be a major risk factor in the development of uterine fibroids. There are several ideas about the use of vitamin D in uterine fibroid prevention or as a long term treatment but ongoing clinical trials in the area remain scarce.what do the results of this study add? Our study showed that 25-hydroxivitamin d3 deficiency is significantly associated with uterine fibroid.Lower levels of 25-hydroxivitamin d3were found to have aninverse relationship with increased size of fibroid uterus.what are the implications of these findings for clinical practice and / or further reasearch? Vitamin D seems to be a promising, safe and low-cost agent for the prevention and treatment of uterine fibroids. However, further studies with larger sample size are needed to confirm our findings.
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Affiliation(s)
- Pritika Srivastava
- Department of Obstetrics and Gynaecology, Era's Lucknow Medical College and Hospital, Lucknow, India
| | - Hem Prabha Gupta
- Department of Obstetrics and Gynaecology, Era's Lucknow Medical College and Hospital, Lucknow, India
| | - Shivani Singhi
- Department of Obstetrics and Gynaecology, Era's Lucknow Medical College and Hospital, Lucknow, India
| | - Sachin Khanduri
- HOD Department of Radiodiagnosis, Era's Lucknow Medical College and Hospital, Lucknow, India
| | - Brijesh Rathore
- Department of Biochemistry, Era's Lucknow Medical College and Hospital, Lucknow, India
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Eccleston D, Cehic D, Cross D, Srivastava P. P2448Evolution of clinical quality activities within a national echocardiography database: seven-year trends from the GenesisCare Outcomes Registry. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0780] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Introduction
Despite rapid technologic advances and sustained growth, less attention has been focused on quality in imaging than in other areas of cardiovascular medicine. To address this deficit, the ACC proposed additional areas of effort such as data standardisation, structured reporting identifying key data elements and imaging registries. We explored these changes within a large multi-centre Australian registry.
Methods
From 2010–2014 we introduced direct online entry of echocardiographic studies into an electronic database, selection and auditing of key data elements and quality improvement pathways to maximise completeness of data acquisition and reporting across 4 states. We compared completeness of key data elements (AV peak velocity, EF, E/E', LA area, rhythm, RVSP) by time and state using de-identified data.
Results
464,688 echocardiographic procedures were captured from 2011 to 2018.
Data completeness improved significantly from 2011 to 2018 (72.0±26.8 vs 88.2±13.5%, p=0.02). Inter-practice variability fell from 2011 to 2018 for both EF and E/E', p<0.002
Conclusion
Identification, systematic capture and auditing of key echo data elements can significantly improve the quality and reduce inter-practice variability of echo data. Developing a national database allows rapid adoption of local quality improvements.
Acknowledgement/Funding
None
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Affiliation(s)
- D Eccleston
- University of Melbourne and GenesisCare, Melbourne, Australia
| | - D Cehic
- University of Adelaide and GenesisCare, Adelaide, Australia
| | - D Cross
- University of Queensland and GenesisCare, Brisbane, Australia
| | - P Srivastava
- University of Melbourne and GenesisCare, Melbourne, Australia
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Dixit P, Anwar M, Saif J, Chamorro-Jorganes A, Dumas M, Angelini G, Punjabi P, Srivastava P, Katare R, Petretto E, Emanueli C. P6309Impaired secretion of clusterin in pericardial fluid of diabetics, a deleterious outcome for the cardiac micro-vasculature. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0906] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Extracellular vesicles are vital mediators of cell-to-cell communications. We previously demonstrated that in the adult heart, exosomes released in the pericardial fluid (PF) have the functional capability to induce cell survival and angiogenesis in recipient endothelial cells. It has previously been shown that PF exosomes from patients with an existing myocardial infarction (MI) contain clusterin (CLU). Remarkably, secreted CLU is cardio-protective as evidenced by enhanced arteriogenesis and reduced apoptosis in animal models of MI. We hypothesize that type 2 Diabetes Mellitus (T2DM) along with ischemic heart disease (IHD) alters PF EV content impairing its reparative angiogenic potential.
Aim
To investigate the role of T2DM in modulating human PF exosomal content and its vascular action.
Methods and results
PF samples were collected from 3 different groups of patients (N=3): 1) Ischemic heart disease (IHD) with or 2) without T2DM, and 3) non-ischaemic, non-diabetic controls operated for mitral valve repair.
The impact of PF exosomes on human coronary microvascular ECs (HCMECs) was evaluated by cell based functional assays for measuring apoptosis, proliferation and angiogenesis. Interestingly, unlike PF exosomes from control patients, PF exosomes from DM patients with IHD promoted EC apoptosis and impaired angiogenesis.
To investigate the effect of T2DM on PF content, we performed high throughput proteomic and metabolomic analysis of whole PF and PF EVs. We identified proteins and metabolites that were differentially expressed under T2DM condition by using the R package Limma. Employing a network approach, protein and metabolic data were integrated by using our newly developed inhouse R package Metabosignal. This networks approach revealed an interesting interaction circuit involving protein CLU. The T2DM-associated reduction of CLU level in the PF, identified from the “omics” analyses was confirmed by ELISA (n=8 patients per group).
To examine the effects of DM and ischemia on CLU intracellular expression and secretion, HCMECs were exposed to high D-glucose (HG, 25 mM) and hypoxia (1%O2). In line with our PF data, HCMECs exposed to HG and hypoxia showed lower levels of both CLU mRNA and secreted CLU (ELISA). Importantly, recombinant CLU (rCLU) treatment on HCMECs rescued their angiogenic potential, induced cell proliferation and protected them from apoptosis under both HG and hypoxia conditions. In addition, silencing of endogenous levels of CLU in HCMECs impaired angiogenesis, suggesting that CLU might be an inherent component of the angiogenesis machinery in ECs.
Conclusions
This study suggests that DM reduces the level of secreted CLU in the PF, depriving myocardial micro-vessels of this protective and regenerative mediator. Restoring diminished CLU levels in the diabetic heart could be a possible therapeutic approach for contrasting diabetic micro-angiopathy.
Acknowledgement/Funding
British Heart Foundation Program Grant
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Affiliation(s)
- P Dixit
- Imperial College London, London, United Kingdom
| | - M Anwar
- Imperial College London, London, United Kingdom
| | - J Saif
- Imperial College London, London, United Kingdom
| | | | - M Dumas
- Imperial College London, London, United Kingdom
| | - G Angelini
- Bristol Heart Institute, Bristol, United Kingdom
| | - P Punjabi
- Imperial College London, London, United Kingdom
| | | | - R Katare
- University of Otago, Physiology, Dunedin, New Zealand
| | - E Petretto
- Duke-NUS Graduate Medical School Singapore, Singapore, Singapore
| | - C Emanueli
- Imperial College London, London, United Kingdom
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Vishnu V, Vinny P, Rajan R, Goyal V, Srivastava P, Lal V, Sylaja P, Narasimhan L, Dwivedi S, Nair P, Ramachandran D, Gupta A. Neurology residents versus a mobile medical application in deducing differential diagnoses in movement disorders: A multi-center, cross-sectional, observational study. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sharma S, Srivastava P, Kuthiala N. Comparison of knowledge, attitude, practices among the different age group of Himachal Pradesh. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Cailes B, Koshy AN, Han H, Sajeev JK, Ko J, Weinberg L, Gow P, Testro A, Srivastava P, Lim H, Teh A, Farouque O. P3465Inducible left ventricular outflow tract obstruction is associated with a higher incidence of perioperative cardiac arrest in liver transplantation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0337] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Inducible left ventricular outflow tract obstruction (LVOTO) is not infrequently encountered in liver transplant (LT) candidates undergoing cardiac workup. While the impact of LVOTO on adverse cardiovascular haemodynamics is well reported, it is unclear whether it predisposes to perioperative cardiovascular complications following LT.
Purpose
To investigate the effect of inducible left ventricular outflow tract obstruction on perioperative cardiovascular complications in a modern cohort of liver transplant patients.
Methods
Consecutive patients undergoing dobutamine stress echocardiography (DSE) were evaluated from a quaternary LT centre between 2010 and 2017. Inducible LVOTO was defined as LVOT gradient ≥36mmHg. Perioperative major adverse cardiovascular events (MACE) at 30 days and all-cause death were recorded from a prospectively maintained transplantation database and augmented by electronic medical record review.
Results
We evaluated 560 patients who underwent DSE as part of a workup for LT. Of these, 319 progressed to transplant. Inducible LVOTO was observed in 68 patients (21.3%). A higher baseline cardiac output (7.7 L/min vs 7.0 L/min, p=0.002) predicted for development of inducible LVOTO. Seventy-seven patients (4.1%) experienced a MACE including five deaths, 19 cases of heart failure, 11 cardiac arrests, 10 acute coronary syndromes and 46 cases of arrhythmias (VT/AF). Overall MACE occurred in 17/68 patients (25.0%) with LVOTO and 60/251 patients (23.9%) without LVOTO (p=0.85). However, there was a significantly increased risk of resuscitated perioperative cardiac arrest in patients with LVOTO (7.4% vs 2.4%, p=0.04). Patients with LVOTO also required significantly greater volumes of fluid intra-operatively (8.37L vs. 6.71L, p=0.043).
Cardiac Arrest in LT Patients with LVOTO
Conclusions
Inducible LVOTO is a frequent finding occurring in 21.3% of LT candidates. Despite higher intraoperative fluid resuscitation, LVOTO increased the risk of a perioperative cardiac arrest. Further studies are required to confirm these findings and to assess whether patients with LVOTO undergoing liver transplantation may benefit from heightened perioperative surveillance.
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Affiliation(s)
- B Cailes
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - A N Koshy
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - H Han
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - J K Sajeev
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - J Ko
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - L Weinberg
- Austin Health Hospital, Department of Anaesthesia, Melbourne, Australia
| | - P Gow
- Austin Health Hospital, Victorian Liver Transplant Unit, Melbourne, Australia
| | - A Testro
- Austin Health Hospital, Victorian Liver Transplant Unit, Melbourne, Australia
| | - P Srivastava
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - H Lim
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - A Teh
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
| | - O Farouque
- Austin Health Hospital, Department of Cardiology, Melbourne, Australia
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Bhasin A, Srivastava P, Kumaran S, Pawan K, Mewar S. Bone marrow derived mononuclear stem cells in chronic stroke: Functional imaging & spectroscopic analysis. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sharma J, Srivastava P, Bhatia R, Rajan R, Singh R, Goyal V, Singh M, Garg A, Vishnu V. ‘Prehospital’ delay in acute stroke reperfusion therapy in Delhi: Time for introspection. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.687] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Koshy A, Cailes B, Testro A, Ramchand J, Sajeev J, Han H, Calafiore P, Jones E, Srivastava P, Salehi H, Teh A, Lim H, Gow P, Farouque O. Impaired Cardiac Reserve on Dobutamine Stress Echocardiography Predicts Development of Hepatorenal Syndrome. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Cailes B, Koshy A, Han H, Sajeev J, Ko J, Weinberg L, Gow P, Testro A, Srivastava P, Lim H, Teh A, Farouque O. Inducible Left Ventricular Outflow Tract Obstruction is Associated with a Higher Incidence of Perioperative Cardiac Arrest in Liver Transplantation. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Oosthuizen S, Srivastava P, Eccleston D, Kearney L. A Technical Perspective of Improving Detail and Consistency in the Performance and Reporting of Echocardiography: An Eight–Year Trend from a National Database. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Koshy A, Cailes B, Gow P, Testro A, Han H, Sajeev J, Ko J, Weinberg L, Srivastava P, Lim H, Teh A, Farouque O. Cardiac Output in End-Stage Liver Disease Increases Proportional to the Degree of Liver Dysfunction. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abu Hishmeh M, Srivastava P, Lougheide Q, Srinivasan M, Murthy S. Massive Spontaneous Hemothorax as a Complication of Apixaban Treatment. Case Rep Pulmonol 2018; 2018:8735036. [PMID: 30410811 PMCID: PMC6206516 DOI: 10.1155/2018/8735036] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/19/2018] [Indexed: 12/03/2022] Open
Abstract
INTRODUCTION Hemothorax is usually related to chest or iatrogenic trauma from procedures such as central lines and thoracentesis. Spontaneous hemothorax is defined as pleural fluid hematocrit greater than 50% of serum hematocrit in absence of natural or iatrogenic trauma affecting the lung or pleural space. Coagulopathy secondary to anticoagulant use has been associated with spontaneous hemothorax. We present a case of spontaneous hemothorax in a patient taking apixaban for venous thromboembolism disease. To our knowledge, this is the first case report of apixaban as a cause of spontaneous hemothorax. CASE PRESENTATION A 56-year-old woman with end-stage renal disease (ESRD) was diagnosed with upper extremity deep vein thrombosis (DVT) one month prior to presentation and was started on apixaban presented with dyspnea and left-sided pleuritic chest pain for two weeks. She was found to have left-sided large pleural effusion which was diagnosed as hemothorax. Other etiologies for spontaneous hemothorax were excluded and drainage by 12-French pigtail catheter achieved total resolution of hemothorax in three days. DISCUSSION Apixaban is a DOAC used to prevent stroke or thromboembolic events in patients with nonvalvular atrial fibrillation and to prevent recurrent venous thromboembolic disease. Events such as gastrointestinal, intracranial, and soft tissue bleeding have been well-documented. However, bleeding manifestation as hemothorax is seldom reported. Our patient presented with isolated left-sided large pleural effusion which was diagnosed as spontaneous hemothorax. 12-Fr pigtail catheter drainage was effective in the management of our patient and provided total resolution in three days. CONCLUSION Spontaneous hemothorax is a rare complication of anticoagulant therapy and might not exhibit the usual radiological signs of traumatic hemothorax. Health care providers should have high index of suspicion for spontaneous hemothorax when evaluating new pleural effusion in patients receiving DOACs therapy. Drainage by small bore pigtail catheter might be as effective as larger chest tubes.
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Affiliation(s)
- M. Abu Hishmeh
- Lincoln Medical and Mental Health Center, Westchester Medical Center, New York Medical College, USA
| | - P. Srivastava
- Lincoln Medical and Mental Health Center, Westchester Medical Center, New York Medical College, USA
| | | | | | - S. Murthy
- Lincoln Medical and Mental Health Center, USA
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Pihlak R, Almond R, Srivastava P, Raja H, Broadbent R, Hopewell L, Higham C, Lamarca A, Hubner R, Valle J, McNamara M. Effects of random glucose (Glc) levels on outcomes of patients (pts) with pancreatic ductal adenocarcinoma (PDAC). Ann Oncol 2018. [DOI: 10.1093/annonc/mdy282.134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Shetty P, Shetty S, Agarwal N, Srivastava P. Third molar in the orbital floor: A precarious presentation of odontogenic keratocyst-A case report and review of literature. Clin Case Rep 2018; 6:1854-1861. [PMID: 30214778 PMCID: PMC6132149 DOI: 10.1002/ccr3.1714] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 06/13/2018] [Indexed: 11/29/2022] Open
Abstract
The case illuminates the likelihood of a dental pathology presenting with discrete signs and symptoms and the importance of the differential diagnosis of some incongruent clinical entities. The purpose of this article was to present a case report of odontogenic keratocyst (OKC) arising in the orbital floor, finding the common thread in rare pathology, and highlighting the aberration in our treatment plan by collating all the wealth of information published in the literature.
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Affiliation(s)
- Premalatha Shetty
- Department of Oral and Maxillofacial SurgeryManipal Academy of Higher EducationManipal College of Dental SciencesMangaloreIndia
| | - Sameep Shetty
- Department of Oral and Maxillofacial SurgeryManipal College of Dental SciencesMangaloreIndia
| | - Nancy Agarwal
- Department of Oral and Maxillofacial SurgeryManipal College of Dental SciencesMangaloreIndia
| | - Pritika Srivastava
- Department of Oral and Maxillofacial SurgeryManipal College of Dental SciencesMangaloreIndia
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Aggarwal A, Phatak S, Srivastava P, Lawrence A, Agarwal V, Misra R. Outcomes in juvenile onset lupus: single center cohort from a developing country. Lupus 2018; 27:1867-1875. [DOI: 10.1177/0961203318791046] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Introduction About 10–20% of systemic lupus erythematosus (SLE) patients have onset in childhood and have more severe organ involvement. Survival of juvenile SLE patients is improving worldwide. Long-term data of childhood onset SLE from developing countries is scarce. Methods Clinical and laboratory data at initial presentation and follow-up visits were retrieved from clinic files, hospital information system and personal interviews. Treatment received, complications, flares, outcomes and death were recorded. Survival was calculated using Kaplan–Meier survival curves and regression analysis was done for predictors of mortality. Results Children with SLE ( n = 273, 250 girls) had a median age at onset of 14 years and duration of illness prior to diagnosis at our hospital of 1 year. Fever and arthritis were the most common presenting manifestations. Renal disease was seen in 60.5% and central nervous system (CNS) disease in 29%. The median follow-up period in 248 patients was 3.5 years. Fourteen children died, and 10 of these had active disease at the time of death. The mean actuarial survival was 24.5 years and survival rates at 1, 5 and 10 years were 97.9%, 95% and 89% respectively. Fever, CNS disease, anti-dsDNA levels and serious infections predicted death on univariate and multivariate analysis. Infections were seen in 72 children (26.3%), and 38 of these infections were serious. One-third of the patients had damage on the last follow-up. Flares were seen in 120 children, the majority being major flares. Conclusion Outcomes of pediatric SLE in North Indian children are similar to those seen in developed countries. Infections pose a major challenge in these patients.
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Affiliation(s)
- A Aggarwal
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - S Phatak
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - P Srivastava
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - A Lawrence
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - V Agarwal
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - R Misra
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
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Srivastava A, Singh S, Rajpurohit CS, Srivastava P, Pandey A, Kumar D, Khanna VK, Pant AB. Secretome of Differentiated PC12 Cells Restores the Monocrotophos-Induced Damages in Human Mesenchymal Stem Cells and SHSY-5Y Cells: Role of Autophagy and Mitochondrial Dynamics. Neuromolecular Med 2018; 20:233-251. [PMID: 29603067 DOI: 10.1007/s12017-018-8487-9] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 03/28/2018] [Indexed: 12/16/2022]
Abstract
A perturbed cellular homeostasis is a key factor associated with xenobiotic exposure resulting in various ailments. The local cellular microenvironment enriched with secretory components aids in cell-cell communication that restores this homeostasis. Deciphering the underlying mechanism behind this restorative potential of secretome could serve as a possible solution to many health hazards. We, therefore, explored the protective efficacy of the secretome of differentiated PC12 cells with emphasis on induction of autophagy and mitochondrial biogenesis. Monocrotophos (MCP), a widely used neurotoxic organophosphate, was used as the test compound at sublethal concentration. The conditioned medium (CM) of differentiated PC12 cells comprising of their secretome restored the cell viability, oxidative stress and apoptotic cell death in MCP-challenged human mesenchymal stem cells and SHSY-5Y, a human neuroblastoma cell line. Delving further to identify the underlying mechanism of this restorative effect we observed a marked increase in the expression of autophagy markers LC3, Beclin-1, Atg5 and Atg7. Exposure to autophagy inhibitor, 3-methyladenine, led to a reduced expression of these markers with a concomitant increase in the expression of pro-apoptotic caspase-3. Besides that, the increased mitochondrial fission in MCP-exposed cells was balanced with increased fusion in the presence of CM facilitated by AMPK/SIRT1/PGC-1α signaling cascade. Mitochondrial dysfunctions are strongly associated with autophagy activation and as per our findings, cellular secretome too induces autophagy. Therefore, connecting these three potential apices can be a major breakthrough in repair and rescue of xenobiotic-damaged tissues and cells.
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Affiliation(s)
- A Srivastava
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India
| | - S Singh
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India
- Academy of Scientific and Innovative Research, CSIR-IITR Campus, Lucknow, India
| | - C S Rajpurohit
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India
- Academy of Scientific and Innovative Research, CSIR-IITR Campus, Lucknow, India
| | - P Srivastava
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India
| | - A Pandey
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India
| | - D Kumar
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India
- Academy of Scientific and Innovative Research, CSIR-IITR Campus, Lucknow, India
| | - V K Khanna
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India
- Academy of Scientific and Innovative Research, CSIR-IITR Campus, Lucknow, India
| | - A B Pant
- System Toxicology and Health Risk Assessment Group, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), MG Marg, Lucknow, Uttar Pradesh, 226001, India.
- Academy of Scientific and Innovative Research, CSIR-IITR Campus, Lucknow, India.
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Omair M, Salehi H, Jones R, Ord M, Calafiore P, Jones E, Srivastava P. Postoperative Atrial Fibrillation and Cardiac Complications After Liver Transplantation. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Srivastava P, Shetty P, Shetty S. Comparison of Surgical Outcome after Impacted Third Molar Surgery Using Piezotome and a Conventional Rotary Handpiece. Contemp Clin Dent 2018; 9:S318-S324. [PMID: 30294165 PMCID: PMC6169275 DOI: 10.4103/ccd.ccd_354_18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background and Aim: One of the most commonly performed surgical procedures by oral and maxillofacial surgeons all over the world is the removal of impacted teeth. The most critical and important steps in third molar extraction are bone cutting or osteotomy. Many techniques are used for this purpose including chisels and mallet, rotary instruments, and ultrasonic-based bone cutting instruments. Piezotome is newer and innovative device for osteotomy based on piezoelectric vibrations. Piezotome is considered very efficient in performing osteotomy because of its selective cutting; being inert against soft tissues, including nerves and blood vessels. The aim of this study was to compare the surgical outcome of third molar surgery using conventional handpiece and piezotome with all other criteria remaining same for all the individuals. Materials and Methods: All patients reporting to the Department of Oral and Maxillofacial surgery, Manipal College of Dental Sciences, Mangalore, for impacted mandibular third molar removal were screened. A total of 30 patients with same Pederson difficulty index for bilateral impacted third molar were selected for the study. The study involved the use of piezotome on one side (Side A) and rotary technique (Side B) on the other side for osteotomy on the same patient with an interval of 1 month. Therapeutic management was same for both the sides. Operating time was recorded in each surgery. Patients were examined postoperatively on 1st, 3rd, and 7th day and pain, edema, trismus, paresthesia, and dry socket were evaluated and compared on both the sides. Data collected were analyzed statistically. Results: The mean operating time was 48.13 min in piezotome (Side A) and 32.90 min in conventional handpiece (Side B) which was statistically significant (P < 0.001). Furthermore, there was statistically significant difference (P < 0.001) in the level of pain (P < 0.001), number of analgesics taken (P < 0.001), and trismus (P < 0.01) on 1st, 3rd, and 7th days postoperatively. There was no statistically significant difference in edema between the two sides. Paresthesia was present in one patient (3.3%) in Side B, while no paresthesia was present in Side A. No incidence of alveolar osteitis was reported on both the sides. Conclusion: Operating time with piezotome was more than that of conventional handpiece, but the postoperative responses such as pain, trismus, and edema were less in piezotome. Hence, despite being a slower procedure, piezotome can be an effective alternative for osteotomy in impacted third molar surgery. We recommend using piezotome for bone cutting and conventional rotary handpiece for tooth sectioning in order to obtain favorable outcomes as well as decreasing the operating time.
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Affiliation(s)
- Pritika Srivastava
- Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Manipal Academy of Higher Education, Mangalore, Karnataka, India
| | - Premalatha Shetty
- Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Manipal Academy of Higher Education, Mangalore, Karnataka, India
| | - Sameep Shetty
- Department of Oral and Maxillofacial Surgery, Manipal College of Dental Sciences, Manipal Academy of Higher Education, Mangalore, Karnataka, India
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Salehi H, Calafiore P, Neef P, Lim R, Smith G, Keraney L, Jones R, Ord M, Hughes T, Jones E, Srivastava P. Dobutamine Stress Echocardiography Compared with Coronary Computed Tomography Angiography in Screening for Coronary Artery Disease in End-Stage Liver Disease Patients Being Assessed for Liver Transplantation. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sinha P, Srivastava P, Srivastava A. Comparison of Visual Inspection with Acetic Acid and the Pap Smear for Cervical Cancer Screening. Acta Cytol 2017; 62:34-38. [PMID: 29136626 DOI: 10.1159/000484036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 08/04/2017] [Accepted: 10/03/2017] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To evaluate the efficacy of visual inspection with acetic acid (VIA) in the early detection of cervical cancer and compare it with the Pap smear. STUDY DESIGN This was a cross-sectional study conducted over a period of 3 months. A total of 316 patients who attended the Gynecology Outpatient Department of Era's Lucknow Medical College and Hospital, fulfilled the inclusion criteria, and gave their informed consent were included. RESULTS VIA was found positive in 38 patients (12.6%). Pap smear was positive in 31 patients (10.3%). Twenty-eight patients had a positive VIA and a positive Pap smear, 3 had a negative VIA and a positive Pap smear, 10 had a positive VIA and a negative Pap smear, and 34 had a negative VIA and a negative Pap smear. CONCLUSION The sensitivity of VIA and the Pap smear was found to be nearly equal, 93.3 and 93.8%, respectively. The Pap smear was found to be more specific than VIA, i.e., 72.9 versus 60%. In terms of test accuracy, the Pap smear was found to have greater test accuracy, i.e., 77.3 versus 66.7% for VIA.
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Affiliation(s)
- Parul Sinha
- Department of Obstetrics and Gynaecology, Era's Lucknow Medical College, Lucknow, India
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Parashar R, Gupt A, Bajpayee D, Gupta A, Thakur R, Sangwan A, Sharma S, Mohanty JS, Kumar A, Srivastava P, Shah A. Lessons from implementation of ‘community based use of Misoprostol tablets to prevent PPH, in India’. Eur J Public Health 2017. [DOI: 10.1093/eurpub/ckx189.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- R Parashar
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - A Gupt
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - D Bajpayee
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - A Gupta
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - R Thakur
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - A Sangwan
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - S Sharma
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - JS Mohanty
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - A Kumar
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - P Srivastava
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
| | - A Shah
- USAID Vriddhi (Scaling Up RMNCH+A interventions) Project, New Delhi, India
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Abstract
Numerous antibiotics as secondary metabolites have been isolated from microbes specifically Streptomyces sp. Rapamycin is one of these, which exhibits many roles as immunosuppressant, antifungal antibiotic, anti-tumour etc. Constant thrust has been put by many researchers to improve the production of rapamycin by Streptomyces hygroscopicus. Past research show that whole cell immobilisation is a useful strategy for antibiotic production with economical advantage. This study is another attempt in this direction which involves immobilisation of producer organism on various supports such as polyutherane foam, sintered beads, glass beads and foam peanuts. These support materials have been selected based on their availability and were pre-treated chemically to improve their adsorption capacity. Comparative profiles have been studied to identify the most suited support for the growth of Streptomyces sp. Variation of biomass immobilisation on various support materials with respect to time in batch culture was studied. Cell release study for the carriers was carried out in production medium to evaluate the performance of beads. Also, scanning electron microscopy (SEM) has been employed for visualisation and analysis of immobilised biomass and measurement of pore size. This study aims to determine a suitable support for immobilisation of Streptomyces hygroscopicus which could be used for rapamycin production in batch and continuous mode.
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Affiliation(s)
- R Sinha
- School of Biochemical Engineering, Indian Institute of Technology (Banaras Hindu University) Varanasi, India
| | - P Srivastava
- School of Biochemical Engineering, Indian Institute of Technology (Banaras Hindu University) Varanasi, India
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Sahoo D, Dewan P, Srivastava P, Kohli A, Sandhu I, Kumari R, Saroha D, Guha A, Tewari A, Singh R. Performance of Gamma Chamber under blast loading. ANN NUCL ENERGY 2017. [DOI: 10.1016/j.anucene.2017.03.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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38
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Al-kaisey A, Jones N, Russell D, Hare D, Kearney L, Srivastava P, Mark H, Oliver L. When the Pathologist Makes the Diagnosis. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ramchand J, Patel S, Kearney L, Velkoska E, Matalanis G, Farouque O, Srivastava P, Burrell L. Plasma ACE2 Activity is a Novel and Independent Predictor of All-Cause Mortality in Patients with Aortic Stenosis. Heart Lung Circ 2017. [DOI: 10.1016/j.hlc.2017.06.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Saxena D, Srivastava P, Phadke SR. A novel heterozygous missense mutation in uromodulin gene in an Indian family with familial juvenile hyperuricemic nephropathy. Indian J Nephrol 2016; 26:364-367. [PMID: 27795632 PMCID: PMC5015516 DOI: 10.4103/0971-4065.167277] [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] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Familial juvenile hyperuricemic nephropathy (FJHN), characterized by early-onset hyperuricemia, reduced fractional excretion of uric acid, and chronic renal failure is caused due to mutation in uromodulin (UMOD) gene. We identified a novel mutation in a family with multiple members affected with FJHN. Ten coding exons of UMOD gene in three family members with clinical and biochemical features of FJHN and one unaffected family member were sequenced, and sequence variants were analyzed for the pathogenicity by bioinformatics studies. A heterozygous novel missense mutation (c. 949 T >G) in exon 5 leading to the replacement of cysteine by glycine at position 317 was identified in all three affected family members. This mutation has not been reported earlier in Human Gene Mutation Database, Human Genome Variation, Clinvar, and 1000 Genome. The mutation lies in the cysteine-rich 2 domain of the protein, and the affected residue is evolutionary conserved in other species. To our knowledge, this is the first report of the identification of UMOD mutation in an Indian family.
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Affiliation(s)
- D Saxena
- Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - P Srivastava
- Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - S R Phadke
- Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
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Ramchand J, Chen J, Yudi M, Kearney L, Calafiore P, O’donnell D, Lu K, Srivastava P, Jones E. The Short-Term Effect of Right Ventricular Mid-septal Pacing on Right Ventricular Function. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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42
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Ramchand J, Jones E, Calafiore P, Lu K, Kearney L, Chen J, Yudi M, Srivastava P. Echocardiographic Assessment of Pulmonary Haemodynamics Using Multiple Parameters. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Sharma V, Srivastava P, Agarwal DD, Diwedi K. Iodination of industrially important aromatic compounds with aqueous potassium triiodide. Russ J Org Chem 2016. [DOI: 10.1134/s1070428016030234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sarker D, Bhattacharya S, Rodriguez RD, Sheremet E, Kabiraj D, Avasthi DK, Zahn DRT, Schmidt H, Srivastava P, Ghosh S. Unraveling The Origin of Enhanced Field Emission from Irradiated FeCo-SiO2 Nanocomposites: A Combined Experimental and First-Principles Based Study. ACS Appl Mater Interfaces 2016; 8:4994-5001. [PMID: 26812580 DOI: 10.1021/acsami.5b07937] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work is driven by the vision of engineering planar field emitters with ferromagnetic metal-insulator nanocomposite thin films, using swift heavy ion (SHI) irradiation method. FeCo nanoparticles inside SiO2 matrix, when subjected to SHI get elongated. Using this, we demonstrate here a planar field emitter with maximum current density of 550 μA/cm(2) at an applied field of 15 V/μm. The film, irradiated with 5 × 10(13) ions/cm(2) fluence (5e13) of 120 MeV Au(9+) ions, shows very high electron emitting quantum efficiency in comparison to its unirradiated counterpart. Surface enhanced Raman spectroscopy analysis of unirradiated and 5e13 films further confirms that the field emission (FE) enhancement is not only due to surface protrusions but also depends on the properties of entire matrix. We find experimental evidence of enhanced valence band density of states (VB DOS) for 5e13 film from XPS, which is verified in the electronic structure of a model FeCo cluster from first-principles based calculations combining density functional theory (DFT) and molecular dynamics (MD) simulations. The MD temperature is selected from the lattice temperature profile inside nanoparticles as deduced from thermal spike model. Increasing the irradiation fluence beyond 5e13, results in reduced VB DOS and melting of surface protrusions, thus causing reduction of FE current density. We finally conclude from theoretical analysis that change in fluence alters the co-ordination chemistry followed by the charge distribution and spin alignment, which influence the VB DOS and concurrent FE as evident from our experiment.
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Affiliation(s)
- Debalaya Sarker
- Department of Physics, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
| | - Saswata Bhattacharya
- Department of Physics, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
| | - Raul D Rodriguez
- Institute of Physics, Technische Universität Chemnitz , Chemnitz 09107, Germany
| | - Evgeniya Sheremet
- Institute of Physics, Technische Universität Chemnitz , Chemnitz 09107, Germany
| | - D Kabiraj
- Material Research Group, IUAC , New Delhi 110067, India
| | - D K Avasthi
- Material Research Group, IUAC , New Delhi 110067, India
| | - Dietrich R T Zahn
- Institute of Physics, Technische Universität Chemnitz , Chemnitz 09107, Germany
| | - H Schmidt
- Department of Electrical Engineering and Information Technology, Technische Universität Chemnitz , Chemnitz 09126, Germany
| | - P Srivastava
- Department of Physics, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
| | - S Ghosh
- Department of Physics, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
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Srivastava P, Abujam B, Misra R, Lawrence A, Agarwal V, Aggarwal A. Outcome of lupus nephritis in childhood onset SLE in North and Central India: single-centre experience over 25 years. Lupus 2015; 25:547-57. [PMID: 26637291 DOI: 10.1177/0961203315619031] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 11/02/2015] [Indexed: 11/16/2022]
Abstract
INTRODUCTION Childhood SLE (cSLE) has a higher prevalence of lupus nephritis (LN), and there are ethnic variations in response to treatment as well as outcome of LN. There are limited data on long-term outcome of LN in cSLE from the Indian subcontinent. METHODS Retrospective analysis of case records of patients with cSLE (satisfying revised American College of Rheumatology (ACR) 1997 criteria for diagnosis) and age of onset <18 years was conducted from 1989 to 2013. Data on clinical features, renal involvement and biopsy findings, treatment, renal outcome, damage accrual and mortality were collected. End-stage renal disease (ESRD) was defined as the need for renal replacement therapy. Actuarial ESRD-free survival was studied as the primary outcome measure using Kaplan-Meier analysis. RESULTS Among 205 children with cSLE, 134 (121 girls) had evidence of LN. The mean age at disease onset was 13.7 ± 3.5 years and the mean disease duration at presentation was 1.9 ± 2.5 years. Kidney biopsy was available for 92 patients, and histology included: 13 (14.2%) Class II, 24 (26%) Class III, 43 (46.7%) Class IV and 12 (13.1%) Class V LN. The mean follow-up period was 6.75 ± 5.7 years. At last visit, 81 (60.4%) children were in complete remission, 28 (20.9%) were in partial remission, 15 (11.2%) still had active nephritis and 10 (7.4%) had progressed to ESRD. Almost two-thirds (62.9%) of patients experienced lupus flares, and mean flare rate was 0.09 flares/patient follow-up year. Fifty-six (43.8%) children accrued damage and the mean Systemic Lupus International Collaborating Clinics (SLICC)/ACR damage score was 0.79 ± 1.13. Actuarial ESRD-free survival at five, 10 and 15 years was 91.1%, 79% and 76.2%, and five-, 10- and 15-year renal survival was 93.8%, 87.1% and 84%, respectively. Although multiple factors individually predicted poor outcome (death/ESRD), only raised serum creatinine at onset (R square = 0.65, p ≤ 0.0001) and damage accrual (R square = 0.62, p ≤ 0.0001) remained significant on multivariate analysis. Eleven (8.2%) children died during the follow-up period, and infections were the leading cause of mortality. CONCLUSIONS Long-term outcome of LN in cSLE in our cohort was better than previous reports from India. However, a high rate of major infection still remains the leading cause of mortality.
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Affiliation(s)
- P Srivastava
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - B Abujam
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - R Misra
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - A Lawrence
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - V Agarwal
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - A Aggarwal
- Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
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Lata M, Srivastava P, Sharma S, Sharma P. Nutrition and healthy aging with special reference to Western Rajasthan. Maturitas 2015. [DOI: 10.1016/j.maturitas.2015.02.343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Puppala M, Yin Z, Konde A, Srivastava P, Baker K, Rice L, Wong S, Iyer S. 243 ELEVATED SERUM FERRITIN IS PREDICTIVE OF INCREASE IN INFECTION AND INCREASED MORTALITY IN PATIENTS WITH MYELODYSPLASTIC SYNDROME. Leuk Res 2015. [DOI: 10.1016/s0145-2126(15)30244-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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48
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Srivastava P, Raut H, Puntambekar H, Desai A. HPLC analysis ofPhyllanthus amarussamples stored in stability chambers under different conditions and study of the effect on quantification of the phytomarkers phyllanthin and hypophyllanthin. ACTA CHROMATOGR 2015. [DOI: 10.1556/achrom.27.2015.1.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Srivastava P, Abou El Asrar R, Knies C, Abramov M, Froeyen M, Rozenski J, Rosemeyer H, Herdewijn P. Achiral, acyclic nucleic acids: synthesis and biophysical studies of a possible prebiotic polymer. Org Biomol Chem 2015; 13:9249-60. [DOI: 10.1039/c5ob00898k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The search for prebiotic, nucleic acid precursors is, at its best, a speculative undertaking.
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Affiliation(s)
| | | | - C. Knies
- Organic Materials Chemistry and Bioorganic Chemistry
- Institute or Chemistry
- University of Osnabrück
- 49069 Osnabrück
- Germany
| | - M. Abramov
- Medicinal Chemistry
- KU Leuven
- B-3000 Leuven
- Belgium
| | - M. Froeyen
- Medicinal Chemistry
- KU Leuven
- B-3000 Leuven
- Belgium
| | - J. Rozenski
- Medicinal Chemistry
- KU Leuven
- B-3000 Leuven
- Belgium
| | - H. Rosemeyer
- Organic Materials Chemistry and Bioorganic Chemistry
- Institute or Chemistry
- University of Osnabrück
- 49069 Osnabrück
- Germany
| | - P. Herdewijn
- Medicinal Chemistry
- KU Leuven
- B-3000 Leuven
- Belgium
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Sarker D, Ghosh S, Srivastava P. Spectral weight shift in the valence band density of states and concurrent increase in field emission by hydrogenation of FeCo–SiO2 nanocomposites. RSC Adv 2015. [DOI: 10.1039/c5ra06106g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Roughened surface and enhanced valence electronic states of hydrogen plasma treated FeCo–SiO2 nanogranular films has made it an efficient field emitter in comparison to its as-grown and furnace annealed counterparts.
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Affiliation(s)
- Debalaya Sarker
- Nanostech Laboratory
- Department of Physics
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - S. Ghosh
- Nanostech Laboratory
- Department of Physics
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - P. Srivastava
- Nanostech Laboratory
- Department of Physics
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
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