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Balakrishnan A, Vijaya Suryaa K, Tripathy H, Trivedi S, Kumar A, Chinthala M. Phosphorylated g-C 3N 4/sulfur self-doped g-C 3N 4 homojunction carboxymethyl cellulose beads: An efficient photocatalyst for H 2O 2 production. J Colloid Interface Sci 2024; 663:1087-1098. [PMID: 38402009 DOI: 10.1016/j.jcis.2024.02.110] [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: 12/20/2023] [Revised: 02/03/2024] [Accepted: 02/12/2024] [Indexed: 02/26/2024]
Abstract
The development of highly reusable, affordable, and durable photocatalysts for the production of hydrogen peroxide (H2O2) remained a challenge. In this study, a homojunction photocatalyst (SPGCN) is constructed between phosphorylated g-C3N4 (PCN) and sulfur self-doped g-C3N4 (SCN) using a simple wet impregnation method. Later, the obtained SPGCN homojunction is transformed into hydrogel beads using carboxymethyl cellulose via an effective cross-linking strategy (SPGCN/CMC). The photocatalytic beads displayed a phenomenal H2O2 production of 3.5 mM under visible light illumination for 60 min. The SPGCN/CMC hydrogel beads showed a maximum reusability of 10 cycles with a decline of 1.5 mM H2O2 production. The improved photocatalytic efficiency is indicated by strengthened utilization of visible light via tuning of the band gap, suppressed recombination of electron-hole pairs, and higher separation efficiency through the effective construction of Z-scheme between the phosphorylated carbon nitride and the sulfur-self-doped carbon nitride present in the SPGCN/CMC beads. The mechanistic studies affirmed the dominant role of superoxide radicals in H2O2 production. The photocatalytic H2O2 production followed a highly selective two-electron reduction reaction. Overall, this study highlights the efficient engineering of carbon nitride-based materials towards artificial photosynthesis.
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Affiliation(s)
- Akash Balakrishnan
- Process Intensification Laboratory, Department of Chemical Engineering, National Institute of Technology Rourkela, Odisha 769 008, India
| | - K Vijaya Suryaa
- Process Intensification Laboratory, Department of Chemical Engineering, National Institute of Technology Rourkela, Odisha 769 008, India
| | - Hritankhi Tripathy
- Environmental Pollution Abatement Laboratory, Department of Chemical Engineering, National Institute of Technology Rourkela, Odisha 769 008, India
| | - Suverna Trivedi
- Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Arvind Kumar
- Environmental Pollution Abatement Laboratory, Department of Chemical Engineering, National Institute of Technology Rourkela, Odisha 769 008, India
| | - Mahendra Chinthala
- Process Intensification Laboratory, Department of Chemical Engineering, National Institute of Technology Rourkela, Odisha 769 008, India.
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Trivedi S, Javed NB, Desai RS, Issar P. Diagnostic efficacy of chest CT imaging in diagnosis of COVID-19 cases based on duration of symptoms. Niger J Clin Pract 2023; 26:1171-1175. [PMID: 37635613 DOI: 10.4103/njcp.njcp_103_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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Abstract
Background Chest computed tomography (CT) imaging provides results more rapidly and with higher sensitivity than reverse transcription polymerase chain reaction in diagnosis of COVID-19. Aim To evaluate diagnostic efficacy of chest CT imaging in diagnosis of COVID-19 cases based on age and duration of symptoms. Materials and Methods A retrospective study conducted during December 2020 to June 2021 in a tertiary care hospital, India. Total 495 patients with typical clinical symptoms of COVID-19, reverse transcription polymerase chain reaction positive for COVID-19 and had undergone chest CT imaging were included. Descriptive statistical analysis was performed for all the variables. Receiver operating characteristic curve analysis was used to determine threshold value of chest CT severity score (CT_SS) based on duration of symptoms and age to diagnose COVID-19. Results Mean age of patients was 61.86 ± 10.77 years and 367 (71.4%) patients were male. Ground glass opacities were observed in 456 (92.1%) patients and in 332 (67.1%) patients, multilobes were affected. Total CT_SS showed positive correlation with age (r = 0.257) and duration of symptoms (r = 0.625). Total CT_SS >6 after a duration of 2 days of symptoms identified COVID-19 cases with sensitivity 90.8% (95% confidence interval [CI]: 87.5%-93.5%) and specificity 84.6% (95% CI: 76.2%-90.9%). Total CT_SS >11 in patients aged more than 60 years identified COVID-19 cases with sensitivity 47.4% (95% CI: 41.2%-53.6%) and specificity 87.3% (95% CI: 82.3%-91.4%). Conclusion Threshold value of CT_SS determined will help to expedite diagnosis of COVID-19 patients by the clinicians in an early stage especially in India and other developing countries which have a high patient volume and limited health resources.
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Affiliation(s)
- S Trivedi
- Department of Respiratory Medicine, Jawaharlal Nehru Hospital and Research Center, Bhilai Nagar, Chhattisgarh, India
| | - N B Javed
- Department of Public Health, College of Health Science, Saudi Electronic University, Dammam, Saudi Arabia
| | - R S Desai
- Department of Respiratory Medicine, Jawaharlal Nehru Hospital and Research Center, Bhilai Nagar, Chhattisgarh, India
| | - P Issar
- Department of Radiology, Jawaharlal Nehru Hospital and Research Center, Bhilai Nagar, Chhattisgarh, India
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Patel K, Dessi D, Trivedi S. Case Report of Male Pseudohermaphroditism (Androgen Insensitivity Syndrome): Congenital Disorder of Sexual Differentiation. J Assoc Physicians India 2023; 71:1. [PMID: 37116050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
INTRODUCTION A broad spectrum of anomalies of sexual differentiation may exist at birth, which can be unreported until adolescence. A 17-year-old patent with female phenotype came with complaints of primary amenorrhea. On imaging (ultrasound and MRI) uterus and bilateral ovaries were absent. Small blind-ending vaginal pouch was noted along with features suggesting bilateral cryptorchidism. No definite male external genitalia/scrotal sac was seen except for subtle rudimentary bulbo-cavernous muscles. Karyotyping confirmed 46 XY consistent with Male Pseudohermaphroditism. MATERIALS Male pseudohermaphroditism refers to a condition that affects 46, XY individuals with differentiated testes who exhibit varying degrees of feminization. In these cases there is a spectrum of external genitalia; some individuals are completely phenotypically female. Androgen insensitivity syndrome (AIS), also known as the testicular feminization syndrome, results from end-organ resistance to androgens, particularly testosterone. As the appearance of the external genitalia often is not distinctive enough to make a specific diagnosis, this must be accomplished by clinical findings along with a combination of imaging, cytogenetic and biochemical studies. Ultrasound and MRI studies are extremely useful to diagnose such conditions at the earliest as these patients have an increased incidence of malignancy in the undescended testes. The treatment is influenced by genital tissue responsiveness to androgens and reconstructive surgical procedures. There is a need for counselling regarding pubertal development, sexual performance and fertility. RESULT A 17year old patent came with complaints of primary amenorrhea. On examination patient has normal external female genitalia, with developed breast. On laboratory correlation, it shows high testosterone level: 881 ng/dL and Normal progesterone level: 0.182 ng/mL. On karyotyping, it shows 46XY karyotype. On USG: Uterus is not well appreciated. There is iso-echogenic oval shaped soft tissue seen in bilateral inguinal regions with vascularity within-likely to be gonads. On MRI: Absence of uterus and bilateral ovaries are confirmed with evidence of symmetrical oval-shaped soft tissue lesions identified within bilateral inguinal canals - consistent with bilateral cryptorchidism. Male pseudohermaphroditism refers to a condition that affects 46, XY individuals with differentiated testes who exhibit varying degrees of feminization. CONCLUSION In cases of male pseudohermaphroditism, there is a spectrum of external genitalia; some individuals are completely phenotypically female, whereas others appear to be normal males with varying spermatogenesis and/or pubertal virilization. As the appearance of the external genitalia often is not distinctive enough to make a specific diagnosis, this must be accomplished by clinical findings along with a combination of cytogenetic, biochemical, and radiologic studies. Sonographic and radiographic studies are often used initially to evaluate such conditions. Male pseudohermaphrodites all possess testes yet exhibit incomplete virilization of the genital ducts and/or external genitalia. The findings depend on the underlying defect. Complete androgen insensitivity (testicular feminization) is an X-linked recessive disorder in which the absence of cytoplasmic testosterone receptors prevents specific gene activation and subsequent differentiation of the external genitalia. In this disorder, the external genitalia are completely feminized, while in the other forms of male pseudohermaphroditism various degrees of virilization occur. The absence of internal female genital tract structures reflects the synthesis of active Mullerian regression factor by the testes, which may be maldescended. Multiplanar MR images will confirm the absence of a uterus and demonstrate intraabdominal or inguinal testes. Integrated imaging in the form of ultrasound, genitography and MRI is important in demonstrating the anatomy, classification, possible effects or congenital malformations in other organs, warning patients of any risk of neoplasia and guiding the clinician to plan other investigations, hormonal replacement or reconstruction surgery if required. References Tanaka YO, Mesaki N, Kurosaki Y, et al. Testicular feminization: role of MRI in diagnosing this rare male pseudohermaphroditism. J Comput Assist Tomogr 1998;22(6):884-888. Nakhal RS, Hall-Craggs M, Freeman A, et al. Evaluation of retained testes in adolescent girls and women with complete androgen insensitivity syndrome. Radiology 2013;268(1):153-160.
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Cheng J, Chen G, Chakraborty D, Kutcher S, Wen J, Chen H, Trivedi S, Sobolewski R. (Cd,Mg)Te crystals for picosecond-response optical-to-x-ray radiation detectors. Rev Sci Instrum 2022; 93:113104. [PMID: 36461512 DOI: 10.1063/5.0101831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 10/18/2022] [Indexed: 06/17/2023]
Abstract
We demonstrate a photodetector sensitive to both optical and x-ray picosecond pulses based on our in-house grown cadmium magnesium telluride (Cd,Mg)Te single crystal. Specifically, we developed In-doped Cd0.96Mg0.04Te material and discuss its femtosecond optical photoresponse, as well as the detector performance, such as <100-pA dark current and up to 0.22-mA/W responsivity for 780-nm wavelength optical radiation. The detector exposed to Ti fluorescence (K alpha) x-ray pulses at 4.5 keV, generated by a free-electron laser beam with the central energy of 9.8 keV and <100 fs pulse width, exhibited readout-electronics-limited 200-ps full-width-at-half-maximum photoresponse, demonstrating that it is suitable for coarse timing in free-electron laser x-ray/optical femtosecond pump-probe spectroscopy applications.
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Affiliation(s)
- J Cheng
- Materials Science Graduate Program, University of Rochester, Rochester, New York 14627, USA
| | - G Chen
- Materials Science Graduate Program, University of Rochester, Rochester, New York 14627, USA
| | - D Chakraborty
- Materials Science Graduate Program, University of Rochester, Rochester, New York 14627, USA
| | - S Kutcher
- Brimrose Technology Corp, Sparks, Maryland 21152, USA
| | - J Wen
- Brimrose Technology Corp, Sparks, Maryland 21152, USA
| | - H Chen
- Brimrose Technology Corp, Sparks, Maryland 21152, USA
| | - S Trivedi
- Brimrose Technology Corp, Sparks, Maryland 21152, USA
| | - Roman Sobolewski
- Materials Science Graduate Program, University of Rochester, Rochester, New York 14627, USA
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Malik P, Trivedi S, Kolte A, Sejian V, Bhatta R, Rahman H. Diversity of rumen microbiota using metagenome sequencing and methane yield in Indian sheep fed on straw and concentrate diet. Saudi J Biol Sci 2022; 29:103345. [PMID: 35770269 PMCID: PMC9234715 DOI: 10.1016/j.sjbs.2022.103345] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 09/09/2021] [Revised: 05/06/2022] [Accepted: 06/10/2022] [Indexed: 11/18/2022] Open
Abstract
Bacteroidetes and Firmicutes were most prevalent bacteria in the sheep rumen. Bacteroidetes were negatively correlated with the Euryarchaeota. Archaea constituted ∼2.5% of the ruminal microbiota. Methanobrevibacter gottschalkii constituted > 50% of the ruminal archaea. Hydrogenotrophic methanogens distribution leads to the variability in methane yield.
An in vivo study aiming to investigate the rumen methanogens community structure was conducted in Mandya sheep fed on straw and concentrate diet. The ruminal fluid samples were collected and processed for unravelling the rumen microbiota and methanogens diversity. Further, the daily enteric methane emission and methane yield was also quantified using the SF6 tracer technique. Results indicated that the Bacteroidetes (∼57%) and Firmicutes (25%) were two prominent affiliates of the bacterial community. Archaea represented about 2.5% of the ruminal microbiota. Methanobacteriales affiliated methanogens were the most prevalent in sheep rumen. The study inveterate that the ruminal archaea community in sheep is composed of 9 genera and 18 species. Methanobrevibacter represented the largest genus of the archaeome, while methylotrophs genera constituted only 13% of the community. Methanobrevibacter gottschalkii was the prominent methanogen, and Methaobrevibacter ruminantium distributed at a lower frequency (∼2.5%). Among Methanomassiliicoccales, Group 12 sp. ISO4-H5 constituted the most considerable fraction (∼11%). KEGG reference pathway for methane metabolism indicated the formation of methane through hydrogenotrophic and methylotrophic pathways, whereas the acetoclastic pathway was not functional in sheep. The enteric methane emission and methane yield was 19.7 g/d and 20.8 g/kg DMI, respectively. Various species of Methanobrevibacter were differently correlated, and the distribution of hydrogenotrophic methanogens mainly explained the variability in methane yield between the individual sheep. It can be inferred from the study that the hydrogenotrophic methanogens dominate the rumen archaeal community in sheep and methylotrophic/aceticlastic methanogens represent a minor fraction of the community. Further studies are warranted for establishing the metabolic association between the prevalent hydrogenotrophs and methylotrophs to identify the key reaction for reducing methane emission.
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Affiliation(s)
- P.K. Malik
- Bioenergetics and Environmental Science Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore 560030, India
- Corresponding author.
| | - S. Trivedi
- Bioenergetics and Environmental Science Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore 560030, India
| | - A.P. Kolte
- Animal Nutrition Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore 560030, India
| | - V. Sejian
- Animal Physiology Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore 560030, India
| | - R. Bhatta
- Director, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore 560030, India
| | - H. Rahman
- International Livestock Research Institute, South Asia Regional Office, New Delhi 110 012, India
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Trivedi S, Stefani L, Byth K, Brown P, Qian P, Kumar S, Thomas S, Thomas L. Left Ventricular Diastolic Dysfunction and Left Atrial Myopathy Independently Predict Atrial Fibrillation Recurrence Post Pulmonary Vein Isolation. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.026] [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: 11/29/2022]
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Stefani L, Boyd A, Ferkh A, Zada M, Devine K, Trivedi S, Tchan M, Thomas L. Basal Segmental Strain as a Marker of Cardiac Involvement in Anderson-Fabry Disease. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.226] [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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Trivedi S, Stefani L, Byth K, Brown P, Qian P, Kumar S, Thomas S, Thomas L. Medium-term Maintenance of Sinus Rhythm Post Pulmonary Vein Isolation Results in Significant Cardiac Reverse Remodelling. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.175] [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: 11/29/2022]
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Karna ST, Gouroumourty R, Ahmad Z, Trivedi S, Thaware P, Singh P. Performance of prognostic scores in prediction of 30-day postoperative mortality in COVID-19 patients after emergency surgery: A retrospective cohort study. J Postgrad Med 2022; 68:199-206. [PMID: 36255012 PMCID: PMC9841536 DOI: 10.4103/jpgm.jpgm_1197_21] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Background : Risk assessment with prognostic scoring, though important, is scarcely studied in emergency surgical patients with COVID-19 infection. Methods and Material We conducted a retrospective cohort study on adult emergency surgical patients with COVID-19 infection in our institute from 1 May 2020 to 31 October 2021 to find the 30-day postoperative mortality and predictive accuracy of prognostic scores. We assessed the demographic data, prognostic risk scores (American Society of Anesthesiologists-Physical Classification (ASA-PS), Sequential Organ Failure Assessment (SOFA), Quick SOFA (qSOFA), Physiologic and Operative Severity Score for the enUmeration of Mortality and Morbidity (POSSUM) and Portsmouth-POSSUM (P-POSSUM) scores), surgical and anesthetic factors. We assessed the postoperative morbidity using the Clavien-Dindo scale and recorded the 30-day mortality. Correlation of prognostic scores and mortality was evaluated using Univariate Cox proportional hazards regression, receiver operating characteristic curve (ROC), Youden's index and Hosmer- Lemeshow goodness of fit model. Results Emergency surgery was performed in 67 COVID-19 patients with postoperative complication and 30-day mortality rate of 33% and 19%, respectively. A positive qSOFA and ASAPS IIIE/IVE had a 9.03- and 12.7-times higher risk of mortality compared to a negative qSOFA and ASA-PS IE/IIE (P < 0.001), respectively. Every unit increase of SOFA, POSSUM and P-POSSUM scores was associated with a 50%, 18% and 17% higher risk of mortality, respectively. SOFA, POSSUM and P-POSSUM AUCROC curves showed good discrimination between survivors and non-survivors (AUC 0.8829, 0.85 and 0.86, respectively). Conclusions SOFA score has a higher sensitivity to predict 30-day postoperative mortality as compared to POSSUM and P-POSSUM. However, in absence of a control group of non-COVID-19 patients, actual risk attributable to COVID-19 infection could not be determined.
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Affiliation(s)
- ST Karna
- Department of Anaesthesiology and Critical Care, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India,Address for correspondence: Dr. Karna ST, E-mail:
| | - R Gouroumourty
- Department of Community and Family Medicine, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India
| | - Z Ahmad
- Department of Anaesthesiology and Critical Care, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India
| | - S Trivedi
- Department of Anaesthesiology and Critical Care, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India
| | - P Thaware
- Department of Anaesthesiology and Critical Care, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India
| | - P Singh
- Department of Anaesthesiology and Critical Care, All India Institute of Medical Sciences, Bhopal, Madhya Pradesh, India
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Singh G, Mukherjee S, Trivedi S, Joshi A, Kaur A, Sahoo S. Observational study to compare the effect of altitude on cardiopulmonary reserves of different individuals staying more than 6 weeks at 10,000 ft and 15,000 ft. Med J Armed Forces India 2021; 77:419-425. [PMID: 34594070 DOI: 10.1016/j.mjafi.2021.07.002] [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: 03/30/2021] [Accepted: 07/04/2021] [Indexed: 10/20/2022] Open
Abstract
Background The variation in heights beyond high altitude has different effects on the cardiorespiratory profile of individuals because of variation in oxygen density with every thousand feet. This study was planned to analyze and compare the effects of difference in altitudes on cardiorespiratory profile from anesthesiologist's point of view. Methods A multicenter observational study was done involving two different groups of 600 patients at 10,000 ft (Group A) and 15,000 ft (Group B). Observation and comparison of oxygen saturation, 6-min walk test, and breath holding time was carried out. Results Fifty-five percent of subjects in Group A had oxygen saturation of more than 93% in comparison to 5.5% in Group B. This was statistically significant (P < 0.001). Two percent of subjects in Group A in comparison to 63.5% of Group B had oxygen saturation of less than 88% (P < 0.001). Percentage increase of more than 15% of heart rate was found to be statistically significant in all the age groups. Overall, 3.8% of individuals in Group A had breath holding time less than 15 s in comparison to 16.6% of individuals in Group B (P value < 0.001). Conclusion The study demonstrates that there is a significant fall in oxygen saturation, significant rise in the heart rate in 6-min walk test, and significant fall in the breath holding time in the group located at 15,000 ft. Heights beyond 10,000 ft should be restricted to life and limb saving surgeries, and logistics should be focused more on "scoop and run" than "stay and play" policy.
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Affiliation(s)
- Gunjan Singh
- Classified Specialist (Anesthesiology & Trained in Pediatric Anesthesiology), Command Hospital (WC), Chandimandir, India
| | - S Mukherjee
- Consultant & Head (Anaesthesiology & Critical Care), Command Hospital (WC), Chandimandir, India
| | - S Trivedi
- Senior Advisor (Anesthesiology & Intensive Care), Command Hospital (WC), Chandimandir, India
| | - A Joshi
- Graded Specialist (Anaesthesiology), 153 GH, C/o 56 APO, India
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Malik PK, Trivedi S, Mohapatra A, Kolte AP, Sejian V, Bhatta R, Rahman H. Comparison of enteric methane yield and diversity of ruminal methanogens in cattle and buffaloes fed on the same diet. PLoS One 2021; 16:e0256048. [PMID: 34379691 PMCID: PMC8357158 DOI: 10.1371/journal.pone.0256048] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 07/28/2021] [Indexed: 11/19/2022] Open
Abstract
An in vivo study was conducted to compare the enteric methane emissions and diversity of ruminal methanogens in cattle and buffaloes kept in the same environment and fed on the same diet. Six cattle and six buffaloes were fed on a similar diet comprising Napier (Pennisetum purpureum) green grass and concentrate in 70:30. After 90 days of feeding, the daily enteric methane emissions were quantified by using the SF6 technique and ruminal fluid samples from animals were collected for the diversity analysis. The daily enteric methane emissions were significantly greater in cattle as compared to buffaloes; however, methane yields were not different between the two species. Methanogens were ranked at different taxonomic levels against the Rumen and Intestinal Methanogen-Database. The archaeal communities in both host species were dominated by the phylum Euryarchaeota; however, Crenarchaeota represented <1% of the total archaea. Methanogens affiliated with Methanobacteriales were most prominent and their proportion did not differ between the two hosts. Methanomicrobiales and Methanomassillicoccales constituted the second largest group of methanogens in cattle and buffaloes, respectively. Methanocellales (Methanocella arvoryza) were exclusively detected in the buffaloes. At the species level, Methanobrevibacter gottschalkii had the highest abundance (55-57%) in both the host species. The relative abundance of Methanobrevibacter wolinii between the two hosts differed significantly. Methanosarcinales, the acetoclastic methanogens were significantly greater in cattle than the buffaloes. It is concluded that the ruminal methane yield in cattle and buffaloes fed on the same diet did not differ. With the diet used in this study, there was a limited influence (<3.5%) of the host on the structure of the ruminal archaea community at the species level. Therefore, the methane mitigation strategies developed in either of the hosts should be effective in the other. Further studies are warranted to reveal the conjunctive effect of diet and geographical locations with the host on ruminal archaea community composition.
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Affiliation(s)
- P. K. Malik
- Bioenergetics and Environmental Science Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, Karnataka, India
| | - S. Trivedi
- Bioenergetics and Environmental Science Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, Karnataka, India
| | - A. Mohapatra
- Bioenergetics and Environmental Science Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, Karnataka, India
| | - A. P. Kolte
- Animal Nutrition Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, Karnataka, India
| | - V. Sejian
- Animal Physiology Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, Karnataka, India
| | - R. Bhatta
- Bioenergetics and Environmental Science Division, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, Karnataka, India
| | - H. Rahman
- International Livestock Research Institute, South Asia Regional Office, New Delhi, India
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Narayanan S, Parikh N, Tavakoli MM, Pandey M, Kumar M, Kalam A, Trivedi S, Prochowicz D, Yadav P. Metal Halide Perovskites for Energy Storage Applications. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100015] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Saranya Narayanan
- Department of Solar Energy School of Technology Pandit Deendayal Petroleum University Gandhinagar 382 007 Gujarat India
| | - Nishi Parikh
- Department of Science School of Technology Pandit Deendayal Petroleum University Gandhinagar 382 007 Gujarat India
| | - Mohammad Mahdi Tavakoli
- Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Manoj Pandey
- Department of Science School of Technology Pandit Deendayal Petroleum University Gandhinagar 382 007 Gujarat India
| | - Manoj Kumar
- Department of Science School of Technology Pandit Deendayal Petroleum University Gandhinagar 382 007 Gujarat India
| | - Abul Kalam
- Department of Chemistry Faculty of Science King Khalid University Abha 61413, P.O. Box 9004 Saudi Arabia
| | - Suverna Trivedi
- Department of Chemical Engineering National Institute of Technology Rourkela 769008 India
| | - Daniel Prochowicz
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Pankaj Yadav
- Department of Solar Energy School of Technology Pandit Deendayal Petroleum University Gandhinagar 382 007 Gujarat India
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Trivedi S, Prochowicz D, Parikh N, Mahapatra A, Pandey MK, Kalam A, Tavakoli MM, Yadav P. Recent Progress in Growth of Single-Crystal Perovskites for Photovoltaic Applications. ACS Omega 2021; 6:1030-1042. [PMID: 33490762 PMCID: PMC7818074 DOI: 10.1021/acsomega.0c04593] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 12/21/2020] [Indexed: 06/12/2023]
Abstract
The growth of high-quality single-crystal (SC) perovskite films is a great strategy for the fabrication of defect-free perovskite solar cells (PSCs) with photovoltaic parameters close to the theoretical limit, which resulted in high efficiency and superior stability of the device. Plenty of growth methods for perovskite SCs are available to achieve a maximum power conversion efficiency (PCE) surpassing 21% for SC-based PSCs. However, there is still a lot of room to further push the efficiency by considering new crystal growth techniques, interface engineering, passivation approaches, and additive engineering. In this review, we summarize the recent progress in the growth of SC-based perovskite films for the fabrication of high-efficiency and stable PSCs. We describe the impact of SC growth of perovskite films and their quality on the device performance and stability, compared with the commonly used polycrystalline perovskite films. In the last section, the challenges and potential of SCs in PSCs are also covered for future development.
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Affiliation(s)
- Suverna Trivedi
- Department
of Chemical Engineering, National Institute
of Technology, Rourkela 769008, India
| | - Daniel Prochowicz
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
| | - Nishi Parikh
- Department
of Science, School of Technology, Pandit
Deendayal Petroleum University, Gandhinagar 382 007, Gujarat, India
| | - Apurba Mahapatra
- Department
of Physics & Astronomy, National Institute
of Technology, Rourkela 769008, India
| | - Manoj Kumar Pandey
- Department
of Science, School of Technology, Pandit
Deendayal Petroleum University, Gandhinagar 382 007, Gujarat, India
| | - Abul Kalam
- Department
of Chemistry, Faculty of Science, King Khalid
University, P.O. Box 9004, Abha 61413, Saudi Arabia
| | - Mohammad Mahdi Tavakoli
- Department
of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Pankaj Yadav
- Department
of Solar Energy, School of Technology, Pandit
Deendayal Petroleum University, Gandhinagar 382 007, Gujarat, India
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14
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Zada M, Lo Q, Trivedi S, Harapoz M, Boyd A, Devine K, Sadick N, Tchan M, Thomas L. Electrocardiographic Characteristics in Fabry Disease Patients: Impact of Impaired Longitudinal Strain and Left Ventricular Hypertrophy. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.066] [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]
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15
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Kolte A, Dhali A, Trivedi S, Malik P, Bhatta R. Effect of DNA isolation method and host species on the metagenomic DNA recovery and microbial community coverage. ANIM NUTR FEED TECHN 2021. [DOI: 10.5958/0974-181x.2021.00015.9] [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]
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16
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Stefani L, Gan G, Trivedi S, Ferkh A, Altman M, Thomas L. LA Strain Mechanics are Altered in Hypertensive Patients vs Healthy Individuals. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.221] [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]
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17
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Ferkh A, Stefani L, Trivedi S, Brown P, Altman M, Thomas L. Comparison of 2-Dimensional Single Plane, Biplane and Triplane With 3-Dimensional Left Atrial Strain. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.198] [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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18
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Trivedi S, Bennett R, Byth K, Campbell T, Turnbull S, Stefani L, Kumar S, Thomas L. Speckle Tracking Echocardiography Predicts Arrhythmia Recurrence in Patients With Structural Heart Disease Following Ventricular Tachycardia Ablation. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.012] [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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19
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Trivedi S, Tang S, Otton J, Delaney G, Holloway L, Liney G, Koh E, Thomas L. Regional cardiac dysfunction determined by radiation dose in patients with breast cancer. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3276] [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
Subclinical left ventricular (LV) dysfunction by 2D global longitudinal strain (GLS) immediately following radiotherapy (RT) and persisting at 12 months has been described in breast cancer (BC) patients. We hypothesised that persistent LV dysfunction may be regional and correlate with segmental RT.
Methods
Transthoracic echocardiograms were performed at baseline, 6 weeks and 12 months post-RT on 61 chemotherapy-naïve women with left sided BC.
Results
Anterior and anteroseptal regions received the highest radiation dose, and posterior and inferior segments the lowest radiation dose (Figure 1). Within each region, there was a progressive increase in the radiation dose received from base to apex. At 6 weeks, the greatest reduction in strain was observed in the anterior and anteroseptal regions, with the most significant reduction in strain in the apical segments. At 12 months, despite improvement in strain, the percentage reduction in strain was similar. There was a significant interaction between both region and segment, on the percentage change in strain at 6 weeks (p<0.001) and at 12 months (p=0.007). Pairwise comparisons of apical to basal percentage change in strain demonstrated the most significant reductions in the anterior region at 6 weeks and 12 months (Table 1).
Conclusions
RT causes segmental myocardial dysfunction, with areas receiving the highest RT demonstrating the largest impairment in strain, with these changes persisting at 12 months. Long term correlation with adverse events is required.
Figure 1. Radiation dose by region and segment
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- S Trivedi
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - S Tang
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - J Otton
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - G Delaney
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - L Holloway
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - G Liney
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - E Koh
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - L Thomas
- Westmead Hospital, Department of Cardiology, Sydney, Australia
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20
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Trivedi S, Prasad R, Mishra A, Kalam A, Yadav P. Current scenario of CNG vehicular pollution and their possible abatement technologies: an overview. Environ Sci Pollut Res Int 2020; 27:39977-40000. [PMID: 32803583 PMCID: PMC7429099 DOI: 10.1007/s11356-020-10361-7] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 08/03/2020] [Indexed: 05/25/2023]
Abstract
Compressed natural gas is an alternative green fuel for automobile industry. Recently, the Indian government is targeting to replace all the conventional fuel vehicles by compressed natural gas (CNG) automobiles due to its several merits. Still, the presence of a significant amount of CO, CH4, and NOx gases in the CNG vehicle exhaust are quiet a matter of concern. Thus, to control the emissions from CNG engines, the major advances are under development of and oxidation is one of them in catalytic converter. In literature, the catalysts such as noble and non-noble metals have been reported for separate oxidation of CO and CH4.. Experimentally, it was found that non-noble metal catalysts are preferred due to its low cost, good thermal stability, and molding tractability. In literature, several articles have been published for CO and CH4 oxidation but no review paper is still available. Thus, the present review provides a comprehensive overview of separate as well as simultaneous CO and CH4 oxidation reactions for CNG vehicular emission control.
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Affiliation(s)
- Suverna Trivedi
- Department of Chemical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi, India.
- Department of Chemical Engineering, National Institute of Technology, Rourkela, Odisha, India.
| | - Ram Prasad
- Department of Chemical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi, India
| | - Ashuthosh Mishra
- Department of Chemical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi, India
- Department of Environment Engineering, CSIR, National Environment and Engineering Research Institute, Noida, India
| | - Abul Kalam
- Department of Chemistry, College of Science, King Khalid University, Guraiger, Saudi Arabia
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, Guraiger, Saudi Arabia
| | - Pankaj Yadav
- Department of Solar Energy, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, 382 007, India
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21
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Malik PK, V LJ, More RP, Kolte AP, Trivedi S, Arun AS, Thirumalaisamy G, Bhatta R. EXPLORING THE METABOLICALLY ACTIVE RUMEN MICROBIOTA AND ITS FIBROLYTIC POTENTIAL IN CROSSBRED CATTLE FED ON FIBROUS DIET THROUGH METATRANSCRIPTOMICS. J microb biotech food sci 2020. [DOI: 10.15414/jmbfs.2020.10.2.182-189] [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: 11/24/2022] Open
Abstract
The rumen wharves conglomerate of symbiotic fibrolytic microflora with the potential to produce repertoire of carbohydrate-active enzymes to elicit the degradation of recalcitrant plant lignocellulosic complex into simpler forms that can be utilized by the host. A metatranscriptomics approach was adopted to explore the metabolically active microbiota and the transcripts involved in the deconstruction of lignocellulose in Indian crossbred cattle rumen. The experimental animals were fed with mixed diet for a period of twenty-one days and the total RNA was isolated from the rumen digesta using a modified total RNA extraction protocol. After mRNA enrichment, the cDNA libraries were subjected to sequencing under Illumina HiSeq platform and generated about 2.89 GB of raw sequences. The contig assembly was accomplished using two different tools and the redundant sequences were removed before further processing. A total of 133,930 orfs were predicted from the assembled contigs using MetaGeneMark tool and the taxonomic affiliation of orfs were achieved using MEGAN 6.0 Community Edition. A total of 17 bacterial, 5 eukaryotic and 1 archaeal phylum were identified from rumen metatranscriptomic dataset. Phylum Bacteroidetes were acknowledged as the most abundant and metabolically active rumen bacterial populations in cattle rumen with 36,414 orfs corresponding to it, followed by Firmicutes with 6,349 orfs. Further, MEGAN annotation of metatranscriptomic data at species level revealed that Prevotella brevis and Prevotella ruminicola as the most metabolically active bacterial populations representing 4,022 and 2,725 orfs each. The functional annotation of metatranscriptomic data using COG database revealed that a large number of transcripts (~16%) were corresponding to translation, ribosomal structure and biogenesis and carbohydrate transport and metabolism (15%). dbCAN annotation of rumen metatranscriptomic data identified and classified 5,267 transcripts belonging to 168 CAZyme families (GH-52%, GT-26%, CBM-14%, CE-6%, PL-2% and AA-0%). The microbial community analysis of the CAZyme encoding transcripts using M5NR database revealed that a significant proportion of CAZymes were contributed by genera Prevotella (37%) and Bacteroides (21%). The cattle rumen microbiome metatranscriptome analysis presented in this study facilitated the detection of large number of transcripts encoding diverse CAZymes that actively take part in the hydrolysis of plant lignocellulose complex that may be useful for improving livestock and biofuel generation.
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22
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Thirumalaisamy G, Malik PK, Kolte AP, Trivedi S, Dhali A, Bhatta R. Effect of silkworm ( Bombyx mori) pupae oil supplementation on enteric methane emission and methanogens diversity in sheep. Anim Biotechnol 2020; 33:128-140. [PMID: 32573336 DOI: 10.1080/10495398.2020.1781147] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 10/24/2022]
Abstract
In vitro and in vivo studies were conducted to examine the effect of silkworm pupae oil on methane (CH4) emission and methanogens diversity. Five graded levels (2, 4, 6, 8 and 10%) of silkworm pupae oil were tested in vitro. Eighteen Mandya adult sheep were divided into three groups. All the animals were fed on similar basal diet except the oil supplementation in test groups. Oil level for supplementation was decided on the basis of in vitro study. In vitro study indicated a reduction of 22% in CH4 production with 2% oil supplementation. Animals in test groups were supplemented with oil (2%) either daily (CON) or intermittently (INT) on every alternate week for all the seven days. A significant reduction of 17-20% in enteric CH4 emission (g/d) was achieved due to oil supplementation in sheep. However, No variation was established between test groups CON and INT. In present study, Methanobrevibacter was major genus contributed ∼90% of the total rumen methanogens; whilst Methanobrevibacter gottschalkii was the most abundant methanogens species. Abundance of Methanobrevibacter ruminantium was affected with the oil supplementation. It can be concluded that the silkworm pupae oil at 2% can decrease CH4 emission by 15-20%.
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Affiliation(s)
- G Thirumalaisamy
- Energy Metabolism Laboratory, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, India
| | - P K Malik
- Energy Metabolism Laboratory, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, India
| | - A P Kolte
- Energy Metabolism Laboratory, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, India
| | - S Trivedi
- Energy Metabolism Laboratory, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, India
| | - A Dhali
- Energy Metabolism Laboratory, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, India
| | - R Bhatta
- Energy Metabolism Laboratory, ICAR-National Institute of Animal Nutrition and Physiology, Bangalore, India
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23
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Vijayvargiya P, Trivedi S, Song H, Liu Y, Steuer C, Stokes W, Kaka A, Patel M, Chen G, Shin D, Beitler J, Aiken A, Saba N. Comparison of the 7th and 8th editions of the American Joint Committee on Cancer (AJCC) staging for oropharyngeal squamous cell carcinomas (OPSCC): A Surveillance, Epidemiology and End Results Program (SEER) database analysis. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2019.11.052] [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: 11/26/2022]
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24
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Trivedi S, Stefani L, Brown P, Kizana E, Kumar S, Thomas S, Thomas L. P353 Structural, functional, and electromechanical alterations in patients with paroxysmal atrial fibrillation compared to healthy controls. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.204] [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 and Methods
We sought to evaluate the clinical and echocardiographic differences between healthy controls and paroxysmal atrial fibrillation (AF) patients. Clinical and echocardiographic parameters (performed in sinus rhythm) in 46 paroxysmal AF patients were compared with a departmental database of 83 health controls.
Results
AF patients were older and had increased body size (Table 1). 39/46 (84%) of AF patients had hypertension and 23/46 (50%) had diabetes mellitus.
AF patients had increased left ventricular (LV) mass, and reduced diastolic function (lower e’ and increased E/e’ ratio) when compared to healthy controls. Left atrial (LA) volumes were significantly increased in the AF group. All strain parameters – reservoir, conduit, and contractile strain – were impaired in AF patients compared to controls. LA mechanical dispersion (MD) was significantly increased in AF patients. A ratio of indexed LA volume/LA reservoir strain was significantly higher in AF patients over controls.
The duration of AF had an inverse correlation with LA reservoir strain (Fig 1) (r=–0.78; p < 0.001).
Conclusions
Compared to healthy controls, patients with paroxysmal AF have significant structural, functional and electromechanical alterations. LA strain is significantly impaired in paroxysmal AF and correlates with AF duration.
Table 1. Echocardiographic parameters Parameter Controls (mean ± SD) AF patients (mean ± SD) P value Age (years) 48 ± 18 58 ± 14 0.001 Body surface area (m2) 1.9 ± 0.2 2 ± 0.2 0.014 LV mass (g) 178 ± 48 223 ± 68 <0.001 Average e’ velocity (cms-1) 10.3 ±2.7 8.1 ± 2.2 <0.001 E/e’ 7.4 ± 1.9 9.3 ± 3.4 0.001 Indexed LA end systolic volume (ml/m2) 27.2 ± 7.1 39.0 ± 11.6 <0.001 LA ejection fraction 55.2 ± 10.4 48.5 ± 14.0 0.007 LA functional index 43.7 ± 14.6 29.8 ± 14.3 <0.001 LA reservoir strain (%) 34.3 ± 6.8 27.9± 8.1 <0.001 LA conduit strain (%) 18.4 ± 6.2 13.5 ± 4.7 <0.001 LA contractile strain (%) 15.9 ± 3.9 14.4 ± 5.5 0.007 LA mechanical dispersion (ms) 25.8 ± 9.6 30.9 ± 11.6 0.018 Indexed LA volume / Reservoir strain ratio 0.8 ± 0.3 1.6 ± 0.9 <0.001 LV = left ventricular; LA = left atrium; SD = standard deviation
Abstract P353 Figure. Fig 1. AF duration vs. Reservoir strain
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Affiliation(s)
- S Trivedi
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - L Stefani
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - P Brown
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - E Kizana
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - S Kumar
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - S Thomas
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - L Thomas
- Westmead Hospital, Department of Cardiology, Sydney, Australia
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25
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Emerson P, Mahendran S, Deshmukh T, Stefani L, Trivedi S, Hogg M, Brown P, Altman M, Panicker S, Gottlieb D, Thomas L. 072 Altered LA Strain in Bone Marrow Transplant (BMT) Patients Previously Treated With Anthracyclines: A Marker of an Atrial Myopathy. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.079] [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: 11/26/2022]
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26
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Ferkh A, Stefani L, Trivedi S, O'Keefe E, Duggins A, Evans A, Robert Denniss A, Kizana E, Thomas L. 366 Left Atrial Mechanical Dispersion in Patients With Embolic Stroke: A Marker of Underlying Atrial Dysfunction. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.373] [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: 11/25/2022]
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Trivedi S, Claessen G, Stefani L, Flannery D, Brown P, Janssens K, Thomas L, La Gerche A. P970 Significant differences in atrial structural and functional parameters leading to differing mechanisms of atrial fibrillation in athletes compared to non-athletes. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.602] [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/Introduction: There is an increased incidence of atrial fibrillation (AF) in endurance athletes. We sought to evaluate the likely mechanistic basis for this phenomenon.
Methods
36 endurance athletes in sinus rhythm, with a previous history of AF (ATH-AF) were compared to age and gender matched endurance athletes with no prior history of AF (ATH), non athletes with paroxysmal AF (NONATH-AF) and age and gender matched healthy controls (CONTROL). A detailed transthoracic echocardiogram was performed with all groups in sinus rhythm, with detailed left atrial (LA) and left ventricular (LV) measurements, including strain analysis.
Results
All athletes had increased LA and LV size when compared with healthy controls (Table 1). Non athletes with paroxysmal AF had increased LA size when compared with controls. However, indexed LA/LV ratio was preserved in athletes and similar to healthy individuals, whilst AF patients had significantly increased LA/LV ratio. Athletes with AF had higher e’ velocity and lower E/e’, whereas e’ was reduced and E/e’ elevated in non-athlete AF patients.
Athletes had impaired LA reservoir and contractile strain, and reduced LV global longitudinal strain (GLS) compared with healthy controls.
Conclusions
Compared to healthy controls, athletes have reduced LA and LV strain, with preserved LV diastolic function and LA/LV ratio. In contrast, altered diastolic function with differential increase in LA volume was observed in AF patients. The increased risk of AF in athletes is likely mediated by different mechanistic processes other than an atrial myopathy consequent to diastolic dysfunction as observed in non-athletes with AF.
Table 1. LA and LV parameters Parameter ATH-AF ATH NONATH-AF CONTROL P value LVEDV indexed (ml/m2) 84 ± 12 79 ± 14 57 ± 10 51 ± 13 <0.001 LVESV indexed (ml/m2) 35 ± 6 34 ± 7 25 ± 8 27 ± 33 0.02 LV ejection fraction (%) 58 ± 4 56 ± 4 56 ± 10 58 ± 8 0.586 LV global longitudinal strain (%) 19.2 ± 1.7 18.9 ± 2.1 21 ± 3.1 21.7 ± 2.9 <0.001 e’ vel (cm/s) 10 ± 2 10 ± 3 8 ± 2 9 ± 2 0.007 E/e’ 5.7 ± 1.3 5.9 ± 1.8 9.1 ± 3.3 7.5 ± 1.5 <0.001 LAV max indexed (ml/m2) 45 ± 11 43 ± 12 38 ± 11 27 ± 8 <0.001 Indexed LAV/LVEDV ratio 0.5 ± 0.1 0.6 ± 0.2 0.7 ± 0.2 0.5 ± 0.1 <0.001 LA reservoir strain (%) 27.2 ± 4.8 28.2 ± 3.7 27.9 ± 8.4 33.2 ± 7.0 <0.001 LA conduit strain (%) 14.2 ± 4.5 14.4 ± 4.0 14.9 ± 5.5 16.6 ± 6.3 0.182 LA contractile strain (%) 13.0 ± 3.1 13.8 ± 3.6 13.0 ± 5.1 16.6 ± 3.1 <0.001 LV = left ventricular, LAV = left atrial volume, LA = left atrial
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Affiliation(s)
- S Trivedi
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - G Claessen
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - L Stefani
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - D Flannery
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - P Brown
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - K Janssens
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - L Thomas
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - A La Gerche
- Baker Heart and Diabetes Institute, Melbourne, Australia
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Ferkh A, Stefani L, Trivedi S, Brown P, Pathan F, Thomas L. P1504 Inter-vendor comparison of left atrial 2-dimensional strain using multilayer analysis. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.928] [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
Left atrial strain (LAS) is increasingly being accepted as a marker of left atrial function. Different vendors utilise different techniques of measuring LAS in echocardiography.
AIMS
To determine the difference between multilayer endocardial and mid-myocardial measurements of LA strain on General Electric (GE) Echopac compared to the TOMTEC system which tracks endocardial strain.
METHODS
Peak reservoir left atrial strain (LAS) was measured on 50 healthy controls using the two different echocardiographic software packages. GE Echopac (v201) 2D-speckle tracking echocardiography technique (LV package) was used to measuremid-myocardial (GE-mid) and endocardial (GE-endo) LAS. This was compared to LAS measurement using TOMTEC (v4.6) which uses an endocardial tracking technique. LAS was measured in 4ch and 2ch views and average biplane strain measurement was obtained.
RESULTS
The mean of GE-mid LAS was 36.3 ± 6.3%, GE-endo LAS was higher with a mean of 44.1 ± 8.0%, while TOMTEC LAS was 42.1 ± 6.3 %. GE-mid and GE-endo LAS correlated well with TOMTEC LAS (r = 0.9, p < 0.001 for both). On Bland-Altman Analysis, GE-mid LAS measurements were systematically lower than TOMTEC LAS (mean difference -5.77), whereas GE-endo LAS had no systematic bias (mean difference 1.99).
CONCLUSIONS
Mid-myocardial peak reservoir left atrial strain, which is routinely measured using GE Echopac software, systematically underestimates LAS as compared to TOMTEC LAS or GE endocardial LAS. This suggests that serial follow up of LAS measurements for patients should be performed on the same software.
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Affiliation(s)
- A Ferkh
- University of Sydney, Sydney, Australia
| | - L Stefani
- University of Sydney, Sydney, Australia
| | - S Trivedi
- University of Sydney, Sydney, Australia
| | - P Brown
- Westmead Hospital, Sydney, Australia
| | - F Pathan
- University of Sydney, Sydney, Australia
| | - L Thomas
- University of Sydney, Sydney, Australia
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Stefani L, Trivedi S, Altman M, Thomas L. 335 Effects of Healthy Aging on Left Atrial Phasic Function Using Strain Analysis. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.342] [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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30
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Mahapatra A, Runjhun R, Nawrocki J, Lewiński J, Kalam A, Kumar P, Trivedi S, Tavakoli MM, Prochowicz D, Yadav P. Elucidation of the role of guanidinium incorporation in single-crystalline MAPbI3 perovskite on ion migration and activation energy. Phys Chem Chem Phys 2020; 22:11467-11473. [DOI: 10.1039/d0cp01119c] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We have studied the effect of guanidinium incorporation in a single-crystalline MAPbI3 perovskite on ion migration using temperature-dependent electrochemical impedance spectroscopy.
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Affiliation(s)
- Apurba Mahapatra
- Department of Physics & Astronomy
- National Institute of Technology
- Rourkela
- India
| | - Rashmi Runjhun
- Institute of Physical Chemistry
- Polish Academy of Sciences
- 01-224 Warsaw
- Poland
| | - Jan Nawrocki
- Institute of Physical Chemistry
- Polish Academy of Sciences
- 01-224 Warsaw
- Poland
| | - Janusz Lewiński
- Institute of Physical Chemistry
- Polish Academy of Sciences
- 01-224 Warsaw
- Poland
- Faculty of Chemistry
| | - Abul Kalam
- Department of Chemistry
- Faculty of Science
- King Khalid University
- Abha 61413
- Saudi Arabia
| | - Pawan Kumar
- Department of Physics & Astronomy
- National Institute of Technology
- Rourkela
- India
| | - Suverna Trivedi
- Department of Chemical Engineering
- National Institute of Technology
- Rourkela
- India
| | - Mohammad Mahdi Tavakoli
- Department of Electrical Engineering and Computer Science
- Massachusetts Institute of Technology
- Cambridge
- USA
| | - Daniel Prochowicz
- Institute of Physical Chemistry
- Polish Academy of Sciences
- 01-224 Warsaw
- Poland
| | - Pankaj Yadav
- Department of Solar Energy
- School of Technology
- Pandit Deendayal Petroleum University
- Gandhinagar-382 007
- India
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Trivedi S, Kumar S, Thomas L. P1783 Concealed structural abnormalities detected by 2D speckle tracking strain echocardiography persist post ablation in patients with idiopathic ventricular arrhythmias. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.1139] [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: 11/12/2022] Open
Abstract
Abstract
Background
Idiopathic ventricular arrhythmias (IVA) occurs in patients without overt heart disease. 2D speckle tracking strain echocardiography parameters, including global longitudinal strain (GLS) and mechanical dispersion (MD), have been shown to predict ventricular arrhythmias. It is unclear if the abnormalities are due to structural substrate abnormality, or substrate abnormality consequent to electrical alterations. Aim: We sought to assess whether patients with IVA have impaired left ventricular (LV) strain indices, and if so, whether these persist following successful treatment with radiofrequency ablation (i.e. correction of electrical alteration). Methods: 2D strain analysis was performed (in sinus rhythm) in 23 consecutive patients with IVA (no structural heart disease by cardiac magnetic resonance imaging (MRI); Group A) prior to electrophysiological mapping/ablation, and compared to 23 age and gender matched healthy controls (Group B). Follow up echocardiography and multiday Holter monitoring was performed 12 months post ablation. Results: Baseline characteristics were similar for indexed LV end diastolic volume (EDV) and ejection fraction (EF) (p = 0.1 for both) (Table 1). LV GLS was lower (p = 0.03) and LV MD was increased (p = 0.002) in the IVA group prior to treatment. At follow up, 18 patients (78%) (Group C) remained free of ventricular arrhythmias – in these patients, LV GLS improved and was similar to controls (p = 0.217); however, LV MD remained significantly increased at 12 months compared to controls (p = 0.009). In the 5 patients (22%) (Group D) that continued to have ventricular arrhythmias at follow up, both LV GLS (p = 0.04) and LV MD (p = 0.008) remained significantly impaired compared to controls. Conclusion: Despite demonstrable absence of structural abnormalities with cardiac MRI, 2D strain can detect subtle alterations in myocardial contraction heterogeneity. Furthermore, 12 months post successful ablation treatment, the increase in MD persists. This suggest the presence of subtle substrate abnormality that results in IVA. In uncured patients, both myocardial deformation parameters remain impaired, suggesting the need for close future surveillance of these patients. Long term follow up with greater number of patients is required to further validate these findings.
Table 1. Echocardiographic parameters Group Indexed LVEDV (ml/m2) LVEF (%) LV GLS (%) LV MD (ms) IVA (Group A) 55 ± 15 61 ± 5 -19.9 ± 3* 44 ± 12* Controls (Group B) 54 ± 14 64 ± 7 -21.2 ± 2 33 ± 9 Group C 12 months follow up -21.7 ± 3 42 ± 11* Group D 12 month follow up -19.8 ± 2* 43 ± 11* * denotes p < 0.05
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Affiliation(s)
- S Trivedi
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - S Kumar
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - L Thomas
- Westmead Hospital, Department of Cardiology, Sydney, Australia
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Trivedi S, Campbell T, Stefani L, Kumar S, Thomas L. 031 Speckle-Tracking Strain Echocardiography in the Assessment of Myocardial Mechanics in Patients With Idiopathic Ventricular Arrhythmias: A Longitudinal Follow-Up Study. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.038] [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: 11/25/2022]
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33
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Prochowicz D, Tavakoli MM, Alanazi AQ, Trivedi S, Tavakoli Dastjerdi H, Zakeeruddin SM, Grätzel M, Yadav P. Charge Accumulation, Recombination, and Their Associated Time Scale in Efficient (GUA) x (MA) 1-x PbI 3-Based Perovskite Solar Cells. ACS Omega 2019; 4:16840-16846. [PMID: 31646230 PMCID: PMC6796885 DOI: 10.1021/acsomega.9b01701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 09/18/2019] [Indexed: 06/10/2023]
Abstract
Here, we study the influence of guanidinium (GUA) ions on the open-circuit voltage (V oc) in the (GUA) x (MA)1-x PbI3 based perovskite solar cells. We demonstrate that incorporation of GUA forms electronic and ionic accumulation regions at the interface of the electron transporting layer and perovskite absorber layer. Our electrochemical impedance spectroscopy results prove that the formed accumulation region is associated with the enhanced surface charge capacitance and photovoltage. Furthermore, we also demonstrate the influence of the GUA ions on the enhanced interfacial and bulk electronic properties due to more efficient charge transfer between the bulk and interfaces and the reduced electronic defect energy levels.
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Affiliation(s)
- Daniel Prochowicz
- Institute
of Physical Chemistry, Polish Academy of
Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
- Laboratory
of Photonics and Interfaces, Institute of Chemical Sciences and Engineering,
School of Basic Sciences, Ecole Polytechnique
Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Mohammad Mahdi Tavakoli
- Department of Electrical Engineering
and Computer Science and Department of
Materials Science and Engineering, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department
of Materials Science and Engineering, Sharif
University of Technology, 14588 Tehran, Iran
| | - Anwar Q. Alanazi
- Laboratory
of Photonics and Interfaces, Institute of Chemical Sciences and Engineering,
School of Basic Sciences, Ecole Polytechnique
Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Suverna Trivedi
- Department of Chemical Engineering, School of Technology and Department of
Solar Energy, School of Technology, Pandit
Deendayal Petroleum University, Gandhinagar 382007, Gujarat, India
| | - Hadi Tavakoli Dastjerdi
- Department of Electrical Engineering
and Computer Science and Department of
Materials Science and Engineering, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Shaik M. Zakeeruddin
- Laboratory
of Photonics and Interfaces, Institute of Chemical Sciences and Engineering,
School of Basic Sciences, Ecole Polytechnique
Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Michael Grätzel
- Laboratory
of Photonics and Interfaces, Institute of Chemical Sciences and Engineering,
School of Basic Sciences, Ecole Polytechnique
Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Pankaj Yadav
- Department of Chemical Engineering, School of Technology and Department of
Solar Energy, School of Technology, Pandit
Deendayal Petroleum University, Gandhinagar 382007, Gujarat, India
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Trivedi S, Steuer C, Tkaczuk A, Shin D, Klein A, Saba N. Systemic bevacizumab for the treatment of recurrent respiratory papillomatosis: A retrospective analysis from an academic tertiary care center. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz252.025] [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: 11/14/2022] Open
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35
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Trivedi S, Kumar S, Thomas L. Speckle Tracking Echocardiography Identifies Selective Regional Pattern of Strain Abnormalities and Propensity for Ventricular Arrhythmias in Patients with Non Ischaemic Cardiomyopathy. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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36
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Trivedi S, Kumar S, Thomas L. Idiopathic Ventricular Arrhythmias in the Absence of Structural Heart Disease are Associated with Concealed Structural Abnormalities as Detected by Speckle Tracking Strain Echocardiography. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.274] [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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37
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Ferkh A, Trivedi S, Stefani L, Brown P, Pathan F, Thomas L. Multivendor Analysis of Left Atrial Strain using Multilayer Analysis. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.293] [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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38
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Trivedi S, Tang S, Koh E, Otton J, Delaney G, Holloway L, Liney G, Thomas L. Radiation Dose Determines Segmental Cardiac Dysfunction in Breast Cancer. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.313] [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: 11/26/2022]
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39
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Trivedi S, Zia Y, Tang J, Lameck C, Tegha G, Kourtis A. Medroxyprogesterone acetate (MPA) concentrations among HIV-infected depot MPA (DMPA) users receiving tenofovir antiretroviral therapy (art) in Lilongwe, Malawi. Contraception 2018. [DOI: 10.1016/j.contraception.2018.07.117] [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: 11/28/2022]
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40
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Trivedi S, Choudhary P, Lo Q, Sritharan H, Batumalai V, Delaney G, Thomas L. P3498Persistent reductions in Global Longitudinal Strain late after completion of radiotherapy in chemotherapy naive patients with left sided breast cancer. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3498] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S Trivedi
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - P Choudhary
- Westmead Hospital, Department of Cardiology, Sydney, Australia
| | - Q Lo
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - H Sritharan
- Liverpool Hospital, Department of Cardiology, Sydney, Australia
| | - V Batumalai
- Liverpool Hospital, Cancer Therapy Centre, Sydney, Australia
| | - G Delaney
- Liverpool Hospital, Cancer Therapy Centre, Sydney, Australia
| | - L Thomas
- Westmead Hospital, Department of Cardiology, Sydney, Australia
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Affiliation(s)
- S. Trivedi
- Dept. of Chemical Engineering &TechnologyIndian Institute of Technology (BHU)Varanasi 221005 India
| | - R. Prasad
- Dept. of Chemical Engineering &TechnologyIndian Institute of Technology (BHU)Varanasi 221005 India
| | - S. K. Gautam
- Dept. of Chemical Engineering &TechnologyIndian Institute of TechnologyKanpur 208016 India
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42
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Trivedi S, Switchenko J, Patel M, Steuer C, El-Deiry M, Higgins K, Solares C, McDonald M, Shin D, Gillespie T, Beitler J, Saba N. The Effect of Hospital Volume and Insurance Status on Overall Survival in Sinonasal Carcinoma: A National Cancer Database (NCDB) Analysis. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2017.12.202] [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: 10/17/2022]
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43
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Trivedi S, Prasad R. Choice of precipitant and calcination temperature of precursor for synthesis of NiCo 2O 4 for control of CO-CH 4 emissions from CNG vehicles. J Environ Sci (China) 2018; 65:62-71. [PMID: 29548412 DOI: 10.1016/j.jes.2017.03.002] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 03/03/2017] [Indexed: 06/08/2023]
Abstract
Compressed natural gas (CNG) is most appropriate an alternative of conventional fuel for automobiles. However, emissions of carbon-monoxide and methane from such vehicles adversely affect human health and environment. Consequently, to abate emissions from CNG vehicles, development of highly efficient and inexpensive catalysts is necessary. Thus, the present work attempts to scan the effects of precipitants (Na2CO3, KOH and urea) for nickel cobaltite (NiCo2O4) catalysts prepared by co-precipitation from nitrate solutions and calcined in a lean CO-air mixture at 400°C. The catalysts were used for oxidation of a mixture of CO and CH4 (1:1). The catalysts were characterized by X-ray diffractometer, Brunauer-Emmett-Teller surface-area, X-ray photoelectron spectroscopy; temperature programmed reduction and Scanning electron microscopy coupled with Energy-Dispersive X-Ray Spectroscopy. The Na2CO3 was adjudged as the best precipitant for production of catalyst, which completely oxidized CO-CH4 mixture at the lowest temperature (T100=350°C). Whereas, for catalyst prepared using urea, T100=362°C. On the other hand the conversion of CO-CH4 mixture over the catalyst synthesized by KOH limited to 97% even beyond 400°C. Further, the effect of higher calcination temperatures of 500 and 600°C was examined for the best catalyst. The total oxidation of the mixture was attained at higher temperatures of 375 and 410°C over catalysts calcined at 500 and 600°C respectively. Thus, the best precipitant established was Na2CO3 and the optimum calcination temperature of 400°C was found to synthesize the NiCo2O4 catalyst for the best performance in CO-CH4 oxidation.
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Affiliation(s)
- Suverna Trivedi
- Department of Chemical Engineering &Technology, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Ram Prasad
- Department of Chemical Engineering &Technology, Indian Institute of Technology (BHU), Varanasi 221005, India.
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44
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Trivedi S, Thomas L, Kumar S. Alterations in Myocardial Mechanics and Tachycardia-Mediated Cardiomyopathy. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.389] [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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45
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Abstract
The present study is devoted to formulating a doped spinel catalyst by a novel route of calcination for the oxidation of the CO–CH4 mixture emitted from compressed natural gas (CNG) vehicles.
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Affiliation(s)
- S. Trivedi
- Department of Chemical Engineering & Technology
- IIT (BHU)
- Varanasi-221005
- India
| | - R. Prasad
- Department of Chemical Engineering & Technology
- IIT (BHU)
- Varanasi-221005
- India
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46
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Trivedi S, Choudhary P, Lo Q, Sritharan H, Batumalai V, Delaney G, Thomas L. Persistent Reductions in Global Longitudinal Strain Late After Radiotherapy in Chemotherapy Naive Left-Sided Breast Cancer Patients. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.490] [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: 11/26/2022]
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47
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Affiliation(s)
- Suverna Trivedi
- Department of Chemical Engineering &Technology; Indian Institute of Technology (BHU); Varanasi 221005 India
| | - Ram Prasad
- Department of Chemical Engineering &Technology; Indian Institute of Technology (BHU); Varanasi 221005 India
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48
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Moreau P, Rabin N, Plesner T, Weisel K, Sonneveld P, Mateos MV, Schecter J, Amin H, Trivedi S, Dimopoulos M. Management of infusion-related reactions (IRRs) in patients (pts) receiving daratumumab plus standard of care for the treatment of multiple myeloma (MM) in the phase 3 studies CASTOR and POLLUX. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx373.004] [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: 11/13/2022] Open
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49
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Trivedi S, Prasad R. Selection of cobaltite and effect of preparation method of NiCo2O4for catalytic oxidation of CO-CH4mixture. ASIA-PAC J CHEM ENG 2017. [DOI: 10.1002/apj.2087] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- S. Trivedi
- Department of Chemical Engineering & Technology; Indian Institute of Technology (BHU); Varanasi 221005 India
| | - R. Prasad
- Department of Chemical Engineering & Technology; Indian Institute of Technology (BHU); Varanasi 221005 India
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50
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Dwivedi A, Srinivasan A, Kumar S, Trivedi S, Shukla VK, Shukla RC. The longest tumor diameter in one dimension as a predictor for skeletal metastasis in renal cell carcinoma. Indian J Cancer 2017; 53:420-422. [PMID: 28244474 DOI: 10.4103/0019-509x.200649] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
INTRODUCTION Renal cell carcinoma (RCC) comprises a diverse group of malignant neoplasms that have multifarious histopathological features and biological behavior. One-third of RCC patients develops skeletal metastasis with a poor 5-year survival rate. Data explaining how some of these tumors show sooner bony metastasis than expected is sparse. The objective of this study was to identify whether tumor size can act as a predictor of bony metastases among patients of RCC. MATERIALS AND METHODS We retrospectively reviewed contrast enhanced computed tomography (CECT) scan and clinical records of 66 patients with RCC, who fulfilled specified inclusion criteria. Patients who had bony metastasis at the time of presentation were selected as case and those without skeletal metastasis were referred to as controls. Receiver operating characteristic (ROC) curve analysis was used to determine the appropriate cut-off value for tumor size, which was measured as the longest tumor diameter (LTD) in one-dimensional (1D). RESULTS Of the 66 patients selected, 30% developed bone metastasis. The tumor size of RCCs significantly correlated with the presence of skeletal metastasis in our study. None of the patients with 1D LTD <4.8 cm on CECT were found to have skeletal metastasis. ROC analysis revealed that the accuracy of the LTD in predicting bone metastasis was high with an area under ROC curve of 0.823. A cut-off value of 7.5 cm had a sensitivity of 78.9% and specificity of 80.9%. CONCLUSION The 1D LTD with a cut-off value of 7.5 cm, at the time of presentation is an important predictor of skeletal metastasis. The result of this study may have role in triage of patients into a subgroup which mandates more aggressive treatment and monitoring.
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Affiliation(s)
- And Dwivedi
- Department of Radiodiagnosis and Imaging, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - A Srinivasan
- Department of Radiodiagnosis and Imaging, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - S Kumar
- Department of Surgery, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - S Trivedi
- Department of Urology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - V K Shukla
- Department of Surgery, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| | - R C Shukla
- Department of Radiodiagnosis and Imaging, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
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