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Urias E, Weil CR, Maity A, Tao R, Gaffney DK. Risk of Cardiac-Specific Mortality in Patients with Lymphoma Treated with Radiotherapy. Int J Radiat Oncol Biol Phys 2023; 117:e489. [PMID: 37785544 DOI: 10.1016/j.ijrobp.2023.06.1717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) The mainstays of treatment for Non-Hodgkin (NHL) and Hodgkin (HL) lymphoma are chemotherapy, radiotherapy (RT), or a combination of both. Thanks to improvements in treatment options many patients outlive their diagnosis by several decades. As treatments are de-intensified and cardiac sparing techniques have improved, the impact of RT on cardiac mortality should be re-visited. In this study, we sought to investigate the potential association between thoracic irradiation and cardiac-specific mortality (CSM) in patients with lymphoma. We hypothesized that receipt of RT would be associated with higher risk of cardiac death. MATERIALS/METHODS The Surveillance Epidemiology and End Results (SEER) database was queried to identify all patients with HL and NHL with a thoracic primary site from 1975 to 2018. Kaplan Meier estimators were used to analyze cardiac-specific survival. Cohorts were balanced using inverse probability treatment weighing (IPTW). Hazard ratios were calculated using multivariate cox regression analysis. The following treatment eras were defined for analysis: pre-1995, 1995-2003, post-2003, to roughly correspond to the adoption of 3D conformal RT (3DCRT) and intensity-modulated RT (IMRT). RESULTS We identified 10,602 patients, of which 8,088 (76%) had NHL and 2,514 (24%) had HL. Seventy-three percent of patients received chemotherapy and 38% received RT. Median follow up was 11.2 years. Forty-eight percent of patients were alive at last follow up, 6.6% had died from cardiac-specific causes, and 45% had died of other causes. Patients who received RT were had a lower risk of CSM (HR = 0.64, p < 0.01). However, IPTW survival analysis revealed no difference in the risk of cardiac death between the treatment cohorts (HR = 1.00, p = 0.99). Multivariate cox regression analysis identified female sex (HR = 0.73, p <0.01), age younger than 40 (HR = 0.27, p <0.01), and diagnosis after 1995 (HR = 0.31, p <0.01) to be associated with a lower CSM. In patients who received RT, we found that the risk of CSM was a higher (HR = 2.66, p <0.01) in those treated in the pre-1995 era and lower (HR = 0.32, p < 0.01) in the post-2003 era when compared to patients treated between 1995-2003. Additionally, receipt of RT was associated with a lower risk of all-cause mortality (HR 0.82, p<0.01). CONCLUSION Our IPTW analysis shows that patients with thoracic lymphoma treated with RT have a similar risk of cardiac death to patients who did not receive RT, and an improved OS. Known cardiovascular risk factors like male sex and older age were associated with higher risk of cardiac death in patients receiving RT. We also found that patients treated with RT pre-1995 had higher CSM compared to those treated in 1995-2003 and those treated after 2003 had the lowest CSM, possibly in part attributable to the adoption of newer RT techniques. These findings may help clinicians counsel patients with lymphoma on the optimal modality of therapy and the possibility for late treatment effects in the modern era.
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Affiliation(s)
- E Urias
- Department of Radiation Oncology, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT
| | - C R Weil
- Department of Radiation Oncology, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT
| | - A Maity
- Department of Radiation Oncology, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT
| | - R Tao
- Department of Radiation Oncology, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT
| | - D K Gaffney
- Department of Radiation Oncology, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT
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Maxwell R, Wright C, Baron J, Dreyfuss A, LaRiviere M, Chong E, Maity A, Plastaras J, Paydar I. Dose Response of Bulky Tumors in Relapsed/Refractory Diffuse Large B-Cell Lymphoma. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.593] [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: 10/31/2022]
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Kostopoulos N, Bedgi S, Krimitza E, Costabile F, Paydar I, Kim M, LaRiviere M, Maity A, Schuster S, Plastaras J, Facciabene A. Radiation Therapy for Bridging and Improving CAR-T Cell Therapy. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.488] [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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Su W, Maity A, Pryma D, Mankoff D, Cohen R, Lukens J, Lin A. A Phase II Study of Nelfinavir plus Concurrent Chemoradiation for Advanced, HPV-Negative Squamous Cell Carcinoma of the Head and Neck. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.613] [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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5
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Mahlangu T, Arunachellan I, Sinha Ray S, Onyango M, Maity A. Preparation of Copper-Decorated Activated Carbon Derived from Platamus occidentalis Tree Fiber for Antimicrobial Applications. Materials (Basel) 2022; 15:5939. [PMID: 36079320 PMCID: PMC9457392 DOI: 10.3390/ma15175939] [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] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 08/20/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
This study focuses on a greener approach to synthesizing activated carbon by carbonizing Platamus occidentalis tree fibers (TFSA) with 98% H2SO4 at 100 °C. The resulted TFSA was employed as an effective adsorbent for copper ions in aqueous media, yielding copper decorated TFSA (Cu@TFSA). The successful adsorption of copper onto the TFSA was proven through extensive characterization techniques. Herein, the TEM and XPS showed that copper nanoparticles were formed in situ on the TFSA surface, without the use of additional reducing and stabilizing agents nor thermal treatment. The surface areas of TFSA and Cu@TFSA were 0.0150 m2/g and 0.3109 m2/g, respectively. Applying the Cu@TFSA as an antimicrobial agent against Escherica coli ( E. coli) and Salmonella resulted in the potential mitigation of complex secondary pollutants from water and wastewater. The Cu@TFSA exhibited outstanding antimicrobial activity against E. coli and Salmonella in both synthetic and raw water samples. This demonstrated a complete growth inhibition observed within 120 min of exposure. The bacteria inactivation took place through the destruction of the bacteria cell wall and was confirmed by the AFM analysis technique. Cu@TFSA has the potential to be used in the water and wastewater treatment sector as antimicrobial agents.
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Affiliation(s)
- Thembisile Mahlangu
- Green Engineering Research Group, Department of Chemical Engineering, Faculty of Engineering and the Built Environment, Durban University of Technology, Durban 4000, South Africa
- DSI/CSIR Centre of Nanostructured and Advanced Materials, 1-Meiring Naude Road, Pretoria 0001, South Africa
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria 0001, South Africa
| | - Iviwe Arunachellan
- Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa
| | - Suprakas Sinha Ray
- DSI/CSIR Centre of Nanostructured and Advanced Materials, 1-Meiring Naude Road, Pretoria 0001, South Africa
| | - Maurice Onyango
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria 0001, South Africa
| | - Arjun Maity
- DSI/CSIR Centre of Nanostructured and Advanced Materials, 1-Meiring Naude Road, Pretoria 0001, South Africa
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria 0001, South Africa
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Parmar V, Maity A, Singh P. 133 A Quality Improvement Project to Improve the Appropriateness of Acute Clinic Referrals to a Local ENT Department Using an Electronic Booking System. Br J Surg 2022. [DOI: 10.1093/bjs/znac039.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Aim
Assess and improve the proportion of inappropriate acute clinic referrals being made to our local ENT department via a telephone referral system with regards to nature and suitability for a junior grade doctor run clinic with senior supervision. Additionally, to make a more efficient, timely and failproof booking system with an auditable trail by transitioning to an electronic referral system.
Method
A guideline was created using based on common protocols from major Trusts within the UK which was then used to assess 101 acute clinic referrals taken from February 2021 to our local service. An electronic referral system was created, and guidelines disseminated to departments commonly making referrals to the acute clinic in anticipation for re-audit in September 2021 alongside introduction of the guideline to new doctors rotating to the specialty at induction in August.
Results
Initial audit revealed 29% of referrals were inappropriate, 50% of which were too complex, 45% were not acute and 5% were due to accidental double-bookings. Additionally, nasal fracture reviews were seen within 10 days only one third of the time, 37% of patients referred did not have a recorded contact number and 13.8% of all referrals were made with incorrect or unclear clinical information.
Conclusions
The lack of clear clinical guidance on referrals to an acute ENT service at our local centre with an outdated telephone referral system is associated with a large proportion of inappropriate referrals, delays to timely care and transcription errors potentially putting patients at risk of harm.
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Affiliation(s)
- V. Parmar
- Bedfordshire Hospitals NHS Foundation Trust, Luton, United Kingdom
| | - A. Maity
- Bedfordshire Hospitals NHS Foundation Trust, Luton, United Kingdom
| | - P. Singh
- Bedfordshire Hospitals NHS Foundation Trust, Luton, United Kingdom
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Zou W, Kim H, Diffenderfer E, Carlson D, Koch C, Xiao Y, Teo B, Metz J, Maity A, Koumenis C, Cengel K, Dong L. FLASH OXYGEN DEPLETION EFFECTS DEPEND ON TISSUE VASCULATURE STRUCTURE: A SIMULATION STUDY ON SMALL ANIMAL PROTON FLASH EXPERIMENT. Phys Med 2022. [DOI: 10.1016/s1120-1797(22)01600-3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Busch T, Velalopoulou A, Karagounis I, Cramer G, Skoufos G, Hatzigeorgiou A, Lanza M, Radaelli E, Assenmacher CA, Putt M, Kim M, Diffenderfer E, Dong L, Metz J, Koumenis C, Cengel K, Maity A. FLASH Mechanisms Track MECHANISMS OF FLASH RADIOTHERAPY SPARING OF NORMAL TISSUE AS INFORMED BY RNA-SEQ TRANSCRIPTOME ANALYSES. Phys Med 2022. [DOI: 10.1016/s1120-1797(22)01452-1] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Velalopoulou A, Karagounis I, Cramer G, Kim M, Skoufos G, Goia D, Hagan S, Verginadis I, Shoniyozov K, Chiango J, Cerullo M, Varner K, Yao L, Qin L, Hatzigeorgiou A, Minn A, Putt M, Lanza M, Assenmacher CA, Radaelli E, Huck J, Diffenderfer E, Dong L, Metz J, Koumenis C, Cengel K, Maity A, Busch T. FLASH Mechanisms Track (Oral Presentations) FLASH PROTON RADIOTHERAPY IS EQUIPOTENT TO STANDARD RADIATION IN TREATMENT OF MURINE SARCOMAS WHILE REDUCING TOXICITIES TO NORMAL SKIN, MUSCLE AND BONE. Phys Med 2022. [DOI: 10.1016/s1120-1797(22)01459-4] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Tudu R, Banerjee J, Habib M, Bandyopadhyay S, Biswas S, Kesh SS, Maity A, Batabyal S, Polley S. Prevalence and molecular characterization of extended-spectrum β-lactamase (ESBL) producing Escherichia coli isolated from dogs suffering from diarrhea in and around Kolkata. Iran J Vet Res 2022; 23:237-246. [PMID: 36425605 PMCID: PMC9681975 DOI: 10.22099/ijvr.2022.42543.6176] [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] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 04/21/2022] [Accepted: 05/02/2022] [Indexed: 03/17/2023]
Abstract
BACKGROUND Dogs are the favorite companion animals among humans. The close interaction between dogs and people increases the risk of antibiotic resistance spreading. Surveillance for antimicrobial resistance and the identification of ESBL-producing Escherichia coli as an indicator bacterium is an important tool for managing antimicrobial drug therapy. AIMS The present study targeted to identify and characterize ESBL-producing E. coli among dogs suffering from diarrhea in and around Kolkata. METHODS Isolation and identification of E. coli from dogs suffering from diarrhea (n=70) along with screening for the production of both ESBL and AmpC. The isolates were further characterized through antimicrobial resistance profiling, resistance genes (bla CTX-M, bla TEM, and bla SHV) screening, and phylogenetic group study. RESULTS Among the 70 isolates, 21 (30%) were confirmed ESBL producers. An antibiogram typing of ESBL-producing E. coli revealed that the majority of them were resistant to norfloxacin (85.7%) followed by tetracycline (61.90%), doxycycline (57.14%), piperacillin/tazobactam (52.38%), cotrimoxazole (47.62%), gentamicin (42.62%), amikacin (23.81%), and chloramphenicol (19.05%). Major resistance genes included bla CTX-M (100%), bla TEM (28.57%), and bla SHV (9.50%). The predominant phylogenetic groups were phylogroup A (76%) followed by phylogroup D (24%). CONCLUSION The current investigation reported a high prevalence of both ESBL and AmpC β-lactamase (AmpC) producing E. coli, co-resistance to a distinct group of antibiotics, and co-existence of different ESBL genes in dogs. Our findings highlight the importance of diagnostic antimicrobial susceptibility testing for proper antimicrobial therapy and to prevent antimicrobial resistance from spreading to humans from dogs in Kolkata and the surrounding area.
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Affiliation(s)
- R Tudu
- Department of Veterinary Biochemistry, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
| | - J Banerjee
- Ph.D. Student in Veterinary Biochemistry, Department of Veterinary Biochemistry, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
| | - Md Habib
- Ph.D. Student in Veterinary Biochemistry, Department of Veterinary Biochemistry, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
| | - S Bandyopadhyay
- Eastern Regional Station, Indian Veterinary Research Institute, Kolkata-700 037, West Bengal, India
| | - S Biswas
- Department of Veterinary Biochemistry, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
| | - S S Kesh
- Department of Veterinary Clinical Complex, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
| | - A Maity
- Department of Veterinary Biochemistry, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
| | - S Batabyal
- Department of Veterinary Biochemistry, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
| | - S Polley
- Department of Veterinary Biochemistry, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, 37, K. B. Sarani, Belgachia, Kolkata-700 037, West Bengal, India
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Bhaumik M, Maity A, Brink HG. Metallic nickel nanoparticles supported polyaniline nanotubes as heterogeneous Fenton-like catalyst for the degradation of brilliant green dye in aqueous solution. J Colloid Interface Sci 2021; 611:408-420. [PMID: 34959012 DOI: 10.1016/j.jcis.2021.11.181] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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: 09/10/2021] [Revised: 11/23/2021] [Accepted: 11/28/2021] [Indexed: 12/01/2022]
Abstract
Metallic nanoparticles supported on porous matrices are promising heterogeneous catalysts for Fenton-like reaction towards the degradation of organic contaminants in water. Herein, novel magnetic nanocomposites (NCs) of metallic nickel (Ni0) nanoparticles and nanotubular polyaniline matrix (PANI/Ni0 NCs) were fabricated by simple reductive formation of Ni0 nanoparticles upon the pre-synthesized PANI nanotubes (NTs) surface and applied as heterogeneous Fenton-like catalyst in degrading cationic brilliant green dye (BG) in aqueous solution. Various physico-chemical characterization techniques revealed effective supporting of soft ferromagnetic well dispersed nano-dimensional Ni0 particles onto the PANI NTs matrix. Heterogeneous Fenton-like catalytic performance of PANI/Ni0 NCs for BG degradation in the presence of hydrogen peroxide (H2O2) oxidant demonstrated their superiority when compared with unsupported Ni0 nanoparticles counterpart. Experiments with a minimum 0.1 g/L of NCs and 10 mM of H2O2 displayed complete degradation of 100 mg/L BG within 120 min reaction time. Improved BG degradation was observed with increase in the dose of PANI/Ni0, H2O2 concentration and temperature, whereas it reduced with rise in initial concentration of BG. The rate of degradation was well described by the pseudo-first- order kinetic model. Six consecutive BG degradation experiments confirmed NCs reusability without loss of original (∼100%) degradation efficiency up to the fifth cycle. Finally, liquid chromatography-mass spectrometric (LC-MS) analyses of the BG samples after 120 min degradation time exposed the formation of N,N-diethylaniline as degradation product along with partial mineralization of the other end products via the attack of reactive hydroxyl radicals (HO•) produced in the catalytic system.
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Affiliation(s)
- Madhumita Bhaumik
- Chemical Engineering Department, University of Pretoria, South Africa.
| | - Arjun Maity
- DST/CSIR, Centre for Nanostructure and Advanced Materials (CeNAM), Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa; Department of Chemical Science, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa.
| | - Hendrik G Brink
- Chemical Engineering Department, University of Pretoria, South Africa.
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Lukens J, Mick R, Huang A, Han N, Farwell M, Mitchell T, Amaravadi R, Schuchter L, Berman A, O'Hara M, Maity A, Miller D, Minn A, Vonderheide R, Wherry E, Maity A. Final Results of a Phase I “RadVax” Trial of Hypofractionated Radiation Combined With Pembrolizumab in Patients With Metastatic Solid Tumors. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.168] [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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Wright C, Baron J, Lee D, Carpenter M, Anstadt E, Briceño C, Chong E, Maity A, Plastaras J, Paydar I. Disease Outcomes Following Low-Dose Radiotherapy vs. Moderate-Dose Radiotherapy for Orbital Low Grade Non-Hodgkin Lymphoma. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.959] [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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Dlamini ML, Bhaumik M, Pillay K, Maity A. Polyaniline nanofibers, a nanostructured conducting polymer for the remediation of Methyl orange dye from aqueous solutions in fixed-bed column studies. Heliyon 2021; 7:e08180. [PMID: 34765762 PMCID: PMC8570955 DOI: 10.1016/j.heliyon.2021.e08180] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 08/07/2021] [Accepted: 10/11/2021] [Indexed: 01/25/2023] Open
Abstract
Polyaniline nanofibers (PANI NFs) were synthesized and employed as potential adsorbents in a continuous flow fixed-bed column adsorption study for an organic dye, Methyl Orange (MO) removal from water. These nanostructured adsorbents were characterized using ATR-FTIR, FE-SEM, HR-TEM, TGA, BET, XRD, XPS, and the Zeta-sizer. Morphological representations from SEM and TEM analyses showed that the fibers were nanosized with diameters lower than 80 nm and an interconnected network possessing a smooth surface. The SBET of the PANI NFs was found to be 35.80 m2/g. The impact of column design parameters for instance; influent concentration, flow rate, and bed mass was investigated using pH 4 influent MO solutions optimized through batch studies. The best influent concentration, bed length, and flow rate for this study were determined as 25 mg/L, 9 cm (6 g), and 3 mL/min, respectively. The column information was fitted in Thomas, Yoon-Nelson, and Bohart-Adams models. It appeared that the Thomas and Yoon-Nelson models described the data satisfactorily. The PANI NFs were able to treat 29.16 L of 25 mg/L MO solution at 9 cm bed length. A sulfate peak in a de-convoluted sulfur spectrum using XPS verified the successful adsorption of Methyl Orange.
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Affiliation(s)
- Mbongiseni Lungelo Dlamini
- Department of Applied Chemistry, University of Johannesburg, 2028, Doornfontein, Johannesburg, South Africa
| | - Madhumita Bhaumik
- Department of Physics, University of South Africa, Johannesburg, 1710, South Africa
| | - Kriveshini Pillay
- Department of Applied Chemistry, University of Johannesburg, 2028, Doornfontein, Johannesburg, South Africa
| | - Arjun Maity
- Department of Applied Chemistry, University of Johannesburg, 2028, Doornfontein, Johannesburg, South Africa
- DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, 1-Meiring Naude Road, Pretoria, 0001, South Africa
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Campion T, Maity A, Ali S, Richards P, Adams A. Concurrent thyrolipomatosis and thymolipoma in a patient with myasthenia gravis: a case report and review of the literature. Ann R Coll Surg Engl 2021; 103:e212-e215. [PMID: 34192501 PMCID: PMC10752004 DOI: 10.1308/rcsann.2020.7089] [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] [Accepted: 09/07/2020] [Indexed: 11/22/2022] Open
Abstract
We present a case of a man with a background of myasthenia gravis who presented with a neck lump, which was diagnosed as thyrolipomatosis in continuity with a very large thymolipoma. Following removal of these lesions, the patient's myaesthenic symptoms improved. While thymolipomas are often seen in the context of myasthenia gravis, thyrolipomatosis is a rare entity and to our knowledge the concurrent finding of both lesions with myasthenia gravis has never been reported. We highlight the important imaging features of both entities and the clinical importance of recognising them.
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Affiliation(s)
| | - A Maity
- Royal London Hospital,
London, UK
| | - S Ali
- Royal London Hospital,
London, UK
| | | | - A Adams
- Royal London Hospital,
London, UK
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16
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Maity A. Meet Our Associate Editorial Board Member. Mini Rev Med Chem 2021. [DOI: 10.2174/138955752110210319142646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- A. Maity
- School of Pharmaceutical Technology, Adamas University Kolkata,India
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Lehutso RF, Tancu Y, Maity A, Thwala M. Characterisation of Engineered Nanomaterials in Nano-Enabled Products Exhibiting Priority Environmental Exposure. Molecules 2021; 26:molecules26051370. [PMID: 33806400 PMCID: PMC7961725 DOI: 10.3390/molecules26051370] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/21/2020] [Accepted: 12/25/2020] [Indexed: 01/22/2023] Open
Abstract
Analytical limitations have constrained the determination of nanopollution character from real-world sources such as nano-enabled products (NEPs), thus hindering the development of environmental safety guidelines for engineered nanomaterials (ENMs). This study examined the properties of ENMs in 18 commercial products: sunscreens, personal care products, clothing, and paints—products exhibiting medium to a high potential for environmental nanopollution. It was found that 17 of the products contained ENMs; 9, 3, 3, and 2 were incorporated with nTiO2, nAg, binaries of nZnO + nTiO2, and nTiO2 + nAg, respectively. Commonly, the nTiO2 were elongated or angular, whereas nAg and nZnO were near-spherical and angular in morphology, respectively. The size ranges (width × length) were 7–48 × 14–200, 34–35 × 37–38, and 18–28 nm for nTiO2, nZnO, and nAg respectively. All ENMs were negatively charged. The total concentration of Ti, Zn, and Ag in the NEPs were 2.3 × 10−4–4.3%, 3.4–4.3%, and 1.0 × 10−4–11.3 × 10−3%, respectively. The study determined some key ENM characteristics required for environmental risk assessment; however, challenges persist regarding the accurate determination of the concentration in NEPs. Overall, the study confirmed NEPs as actual sources of nanopollution; hence, scenario-specific efforts are recommended to quantify their loads into water resources.
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Affiliation(s)
- Raisibe Florence Lehutso
- Water Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa; (R.F.L.); (Y.T.)
- Department of Chemical Sciences, University of Johannesburg, Johannesburg 2006, South Africa;
| | - Yolanda Tancu
- Water Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa; (R.F.L.); (Y.T.)
| | - Arjun Maity
- Department of Chemical Sciences, University of Johannesburg, Johannesburg 2006, South Africa;
- DST/CSIR, Centre for Nanostructure and Advanced Materials (CeNAM), Council for Scientific and Industrial Research, Pretoria 0001, South Africa
| | - Melusi Thwala
- Water Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa; (R.F.L.); (Y.T.)
- Department of Environmental Health, Nelson Mandela University, Port Elizabeth 6031, South Africa
- Correspondence: ; Tel.: +27-12-841-3859
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Maity A, Panesar H, Kajekar P, Singh P, Panesar J. Safe surgical tracheostomy in patients with COVID-19: key clinical considerations. Ann R Coll Surg Engl 2021; 103:e44-e47. [PMID: 33559561 PMCID: PMC9773852 DOI: 10.1308/rcsann.2020.7024] [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] [Indexed: 12/12/2022] Open
Abstract
Surgical tracheostomy is a high aerosol-generating procedure that is an essential aid to the recovery of patients who are critically ill with COVID-19 pneumonia. We present a single-centre case series of 16 patients with COVID-19 pneumonia who underwent tracheostomy. We recommend that the patient selection criteria for achieving a favourable outcome should be based on fraction of inspired oxygen together with prone-position ventilation. As with any challenging situation, the importance of effective communication is paramount. The critical modifications in the surgical steps are clearly explained. Timely tracheostomy also leads to an earlier freeing up of ventilator space during a period of a rapidly escalating pandemic. The outcomes in terms of swallow and speech function were also assessed. The study has also helped to remove the anxiety around open a tracheostomy in patients who are COVID-19 positive.
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Affiliation(s)
- A Maity
- Department of Otolaryngology, Luton and Dunstable Hospital NHS Foundation Trust, Luton, UK
| | - H Panesar
- Department of Ear, Nose and Throat, Nobles Hospital, Braddan, Isle of Man
| | - P Kajekar
- Department of Anaesthetics, Luton and Dunstable Hospital NHS Foundation Trust, Luton, UK
| | - P Singh
- Department of Otolaryngology, Luton and Dunstable Hospital NHS Foundation Trust, Luton, UK
| | - J Panesar
- Department of Otolaryngology, Luton and Dunstable Hospital NHS Foundation Trust, Luton, UK
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Sypu VS, Bhaumik M, Raju K, Maity A. Nickel hydroxide nanoparticles decorated napthalene sulfonic acid-doped polyaniline nanotubes as efficient catalysts for nitroarene reduction. J Colloid Interface Sci 2021; 581:979-989. [PMID: 32961349 DOI: 10.1016/j.jcis.2020.08.111] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 08/09/2020] [Accepted: 08/28/2020] [Indexed: 12/11/2022]
Abstract
Nanosize nickel hydroxide decorated 2-napthalene sulfonic acid-doped polyaniline nanotubes nanocomposites (Ni(OH)2@NSA-PANI NCs) were successfully developed for the catalytic reduction of aromatic nitro compounds. The Ni(OH)2@NSA-PANI NCs were synthesised by depositing Ni(OH)2 nanoparticles onto 2-napthalene sulfonic acid doped PANI nanotubes surface. The resulting material was characterized using field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), powder X-ray diffraction (P-XRD), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The prepared nanocomposite showed a remarkable ability to catalytically hydrogenate aromatic nitro compounds using sodium borohydride (NaBH4) as hydrogen source in aqueous medium at room temperature. Kinetic studies were performed using 4-nitrophenol (4-NP) as the model substrate, using the Langmuir-Hinshelwood model. The catalyst showed pseudo-first-order kinetics, with rate constants estimated between 0.08287 and 0.3649 min-1. Catalyst recyclability without reduced activity was demonstrated over 10 successive cycles. The optimised nanocomposite catalyst demonstrated a low activation energy barrier towards 4-NP reduction.
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Affiliation(s)
| | - Madhumita Bhaumik
- Chemical Engineering Department, University of Pretoria, South Africa
| | - Kumar Raju
- Energy Centre, Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa
| | - Arjun Maity
- Department of Chemical Science, University of Johannesburg, Johannesburg, South Africa; DST/CSIR, Centre for Nanostructure and Advanced Materials (CeNAM), Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa.
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Goddeti SMR, Maity A, Ray SS. Polypyrrole-coated gum ghatti-grafted poly(acrylamide) composite for the selective removal of hexavalent chromium from waste water. Int J Biol Macromol 2020; 164:2851-2860. [DOI: 10.1016/j.ijbiomac.2020.07.324] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 10/23/2022]
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Sambaza S, Maity A, Pillay K. Polyaniline-Coated TiO 2 Nanorods for Photocatalytic Degradation of Bisphenol A in Water. ACS Omega 2020; 5:29642-29656. [PMID: 33251400 PMCID: PMC7689664 DOI: 10.1021/acsomega.0c00628] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 07/13/2020] [Indexed: 05/23/2023]
Abstract
Polyaniline (PANI)-wrapped TiO2 nanorods (PANI/TiO2), obtained through the oxidative polymerization of aniline at the surface of hydrothermally presynthesized TiO2 nanorods, were evaluated as photocatalysts for the degradation of Bisphenol A (BPA). Fourier-transform infrared spectroscopy analysis revealed the successful incorporation of PANI into TiO2 by the appearance of peaks at 1577 and 1502 cm-1 that are due to the C=C and C-N stretch of the benzenoid or quinoid ring in PANI. Brunauer-Emmett-Teller analysis revealed that PANI/TiO2 had almost double the surface area of TiO2 (44.8999 m2/g vs 28.2179 m2/g). Transmission electron microscopy (TEM) analysis showed that TiO2 nanorods with different diameters were synthesized. The TEM analysis showed that a thin layer of PANI wrapped the TiO2 nanorods. X-ray photon spectroscopy survey scan of the PANI/TiO2 nanocomposite revealed the presence of C, O, Ti, and N. Photocatalytic activity evaluation under UV radiation through the effect of key parameters, including pH, contact time, dosage, and initial concentration of BPA, was carried out in batch studies. Within 80 min, 99.7% of 5 ppm BPA was attained using the 0.2 g/L PANI/TiO2 photocatalyst at pH 10. The quantum yield (QY) of these photocatalysts was evaluated to be 9.86 × 10-5 molecules/photon and 2.82 × 10-5 molecules/photon for PANI/TiO2 and TiO2, respectively. PANI/TiO2 showed better performance than as-synthesized TiO2 with a rate constant of 4.46 × 10-2 min-1 compared to 2.18 × 10-2 min-1. The rate of degradation of PANI/TiO2 was also superior to that of TiO2 (150 mmol/g/h vs 74.89 mmol/g/h). Nitrate ions increased the rate of degradation of BPA, while humic acid consistently inhibited the degradation of BPA. LC-MS analysis identified degradation products with m/z 213.1, 135.1, and 93.1. The PANI/TiO2 nanocomposite was reused up to five cycles with a removal of at least 80% in the fifth cycle. LC-MS results revealed three possible BPA degradation intermediates. LC-MS analysis identified degradation products which included protonated BPA, [C14H13O2 +], and [C9H11O+]. The PANI/TiO2 nanocomposite demonstrated superior photocatalytic activity with respect to improved QY and figure of merit and lower energy consumption.
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Taylor J, Ruggiero M, Maity A, Ko K, Greenberger B, Donofree D, Sherif K, Lazar M, Jaslow R, Richard S, Mitchell E, Anne P, Trabulsi E, Leader A, Simone N. Sexual Health Toxicity in Cancer Survivors: Is There a Gender Disparity in Physician Evaluation and Intervention? Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Manjunath S, Cohen A, Arscott W, Maity A, Plastaras J, Paydar I. Is Bridging Radiation (RT) Safe with B Cell Maturation Antigen–targeting Chimeric Antigenic Receptor T Cells (CART-BCMA) Therapy? Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.934] [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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Sariket D, Ray D, Baduri S, Ghosh S, Maity A, Bhattacharya C. Synthesis of g‐C
3
N
4
/InVO
4
Semiconductor for Improved Photocatalytic and Photoelectrochemical Applications. ELECTROANAL 2020. [DOI: 10.1002/elan.202060161] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Debasis Sariket
- Department of Chemistry Indian Institute of Engineering Science & Technology, (IIEST) Shibpur, Howrah 711103 West Bengal INDIA
| | - Debasish Ray
- Department of Chemistry Indian Institute of Engineering Science & Technology, (IIEST) Shibpur, Howrah 711103 West Bengal INDIA
| | - Swarnendu Baduri
- Department of Chemistry Indian Institute of Engineering Science & Technology, (IIEST) Shibpur, Howrah 711103 West Bengal INDIA
| | - Sangeeta Ghosh
- Department of Chemistry Indian Institute of Engineering Science & Technology, (IIEST) Shibpur, Howrah 711103 West Bengal INDIA
| | - Arjun Maity
- DST/CSIR National Centre for Nanostructured Materials Council for Scientific and Industrial Research, Pretoria-0001 South Africa
- Department of Applied Chemistry University of Johannesburg South Africa
| | - Chinmoy Bhattacharya
- Department of Chemistry Indian Institute of Engineering Science & Technology, (IIEST) Shibpur, Howrah 711103 West Bengal INDIA
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Das P, Saha I, Chatterjee A, Pramanick K, Chakraborty S, Maity A, Bhowal S, Pradhan D, Mukherjee D, Maiti B. Participation of Phosphatidylinositol-3 Kinase Signalling in Human Chorionic Gonadotropin, Bovine Insulin (B-Insulin) and Human-Insulin-Like Growth Factor-I Induced Oocyte Maturation and Steroidogenesis in the Grey Mullet, Mugil Cephalus. Acta Endocrinol (Buchar) 2020; 16:426-436. [PMID: 34084233 PMCID: PMC8126398 DOI: 10.4183/aeb.2020.426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
CONTEXT The grey mullet, Mugil cephalus, is an edible fish of high economic importance. Breeding biology with reference to hormonal/growth factor regulation of oocyte maturation needs to be known for its commercial production. OBJECTIVE The present study was conducted to examine the potency of maturation inducing hormones, chorionic gonadotropin (hCG), bovine-insulin, and insulin like growth factor1 (h-IGF-1) I on ovarian steroidogenesis and oocyte maturation. DESIGN The role of hormones and growth factors on steroidogenesis and oocyte maturation was investigated using specific inhibitors, Wortmannin for phosphatidylinositol-3 (PI3) kinase, trilostane for 3β-hydroxysteroid dehydrogenase, 1-octanol and 1-heptanol for gap junctions, actinomycin D for transcription and cycloheximide for translation of signal molecules. METHODS Actions of hormonal and growth factors were examined for steroidogenesis, by radioimmunoassay and oocyte maturation by germinal vesicle breakdown (GVBD). Specific inhibitors were used to determine the cell signaling pathways, PI3 kinase. RESULTS All the inhibitors attenuated the hCG-induced oocyte maturation (GVBD%), steroidogenesis including transcription, translation, gap junctions and PI3 kinase signaling. These inhibitors failed to inhibit h-IGF-I and b-insulin-induced oocyte maturation, steroidogenesis, translation and PI3 kinase signaling. CONCLUSION hCG induces oocyte maturation via steroid dependent pathway involving gap junctions, transcription, translation and PI3 kinase signaling, unlike h-IGF-I and b-insulin in the mullet.
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Affiliation(s)
- P. Das
- University Of Calcutta - Zoology, Kolkata, West Bengal, India
| | - I. Saha
- University Of Calcutta - Zoology, Kolkata, West Bengal, India
| | - A. Chatterjee
- University Of Calcutta - Zoology, Kolkata, West Bengal, India
| | - K. Pramanick
- University Of Calcutta - Zoology, Kolkata, West Bengal, India
| | | | - A. Maity
- University Of Calcutta - Zoology, Kolkata, West Bengal, India
| | - S. Bhowal
- University Of Calcutta - Biochemistry, Kolkata, West Bengal, India
| | - D. Pradhan
- Egra Sarada Shashi Bhusan College - Zoology, Egra, West Bengal, India
| | - D. Mukherjee
- University Of Calcutta - Zoology, Kolkata, West Bengal, India
| | - B.R. Maiti
- University Of Calcutta - Zoology, Kolkata, West Bengal, India
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Bhaumik M, Raju K, Arunachellan I, Ludwig T, Mathe MK, Maity A, Mathur S. High-performance supercapacitors based on S-doped polyaniline nanotubes decorated with Ni(OH)2 nanosponge and onion-like carbons derived from used car tyres. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136111] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Maponya TC, Ramohlola KE, Kera NH, Modibane KD, Maity A, Katata-Seru LM, Hato MJ. Influence of Magnetic Nanoparticles on Modified Polypyrrole/ m-Phenylediamine for Adsorption of Cr(VI) from Aqueous Solution. Polymers (Basel) 2020; 12:E679. [PMID: 32204322 PMCID: PMC7182836 DOI: 10.3390/polym12030679] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/17/2020] [Accepted: 02/20/2020] [Indexed: 01/12/2023] Open
Abstract
A novel, modified polypyrrole/m-phenylediamine (PPy-mPD) composite, decorated with magnetite (Fe3O4) nanoparticles, and prepared via an in-situ oxidative polymerisation, was investigated. The PPy-mPD/Fe3O4 nanocomposite was employed for the removal of highly toxic oxyanion hexavalent chromium Cr(VI) from an aqueous solution. The structure and successful formation of the PPy-mPD/Fe3O4 nanocomposite was confirmed and investigated using various techniques. The presence of Fe3O4 was confirmed by high resolution transmission electron microscopy, with an appearance of Fe lattice fringes. The estimation of the saturation magnetisation of the nanocomposite, using a vibrating sample magnetometer, was observed to be 6.6 emu/g. In batch adsorption experiments, PPy-mPD/Fe3O4 nanocomposite (25 mg) was able to remove 99.6% of 100 mg/L of Cr(VI) at pH 2 and 25 °C. Adsorption isotherms were investigated at different Cr(VI) concentration (100-600 mg/L) and temperature (15-45 °C). It was deduced that adsorption follows the Langmuir model, with a maximum adsorption capacity of 555.6 mg/g for Cr(VI) removal. Furthermore, isotherm data were used to calculate thermodynamic values for Gibbs free energy, enthalpy change and entropy change, which indicated that Cr(VI) adsorption was spontaneous and endothermic in nature. Adsorption-desorption experiments revealed that the nanocomposite was usable for two consecutive cycles with no significant loss of adsorption capacity. This research demonstrates the application potential for the fascinating properties of PPy-mPD/Fe3O4 nanocomposite as a highly efficient adsorbent for the removal of heavy metal ions from industrial wastewater.
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Affiliation(s)
- Thabiso Carol Maponya
- Nanotechnology Research Lab, Department of Chemistry, School of Physical and Mineral Sciences, University of Limpopo (Turfloop), Sovenga 0727, Polokwane, South Africa; (T.C.M.); (K.E.R.)
| | - Kabelo Edmond Ramohlola
- Nanotechnology Research Lab, Department of Chemistry, School of Physical and Mineral Sciences, University of Limpopo (Turfloop), Sovenga 0727, Polokwane, South Africa; (T.C.M.); (K.E.R.)
| | - Nazia Hassan Kera
- DST/CSIR Innovation Centre, National Centre for Nanostructured Materials, CSIR Material Science and Manufacturing, Pretoria 0001, South Africa; (N.H.K.); (A.M.)
| | - Kwena Desmond Modibane
- Nanotechnology Research Lab, Department of Chemistry, School of Physical and Mineral Sciences, University of Limpopo (Turfloop), Sovenga 0727, Polokwane, South Africa; (T.C.M.); (K.E.R.)
| | - Arjun Maity
- DST/CSIR Innovation Centre, National Centre for Nanostructured Materials, CSIR Material Science and Manufacturing, Pretoria 0001, South Africa; (N.H.K.); (A.M.)
| | - Lebogang Maureen Katata-Seru
- Chemistry Department, Faculty of Natural and Agricultural Sciences, North-West University, Mmabatho 2735, South Africa;
| | - Mpitloane Joseph Hato
- Nanotechnology Research Lab, Department of Chemistry, School of Physical and Mineral Sciences, University of Limpopo (Turfloop), Sovenga 0727, Polokwane, South Africa; (T.C.M.); (K.E.R.)
- Department of Environmental Sciences, College of Agriculture and Environmental Sciences, University of South Africa (UNISA), Florida Science Campus, Johannesburg 1710, South Africa
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Goddeti SMR, Bhaumik M, Maity A, Ray SS. Removal of Congo red from aqueous solution by adsorption using gum ghatti and acrylamide graft copolymer coated with zero valent iron. Int J Biol Macromol 2020; 149:21-30. [PMID: 31981661 DOI: 10.1016/j.ijbiomac.2020.01.099] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 01/03/2020] [Accepted: 01/09/2020] [Indexed: 11/19/2022]
Abstract
Gum ghatti (Gg) and acrylamide (AAm) grafted copolymer [poly (Gg-AAm)] coated by zero valent iron (ZVI) was developed to remove toxic Congo red (CR) from waste water. Prepared composite, [poly (Gg-AAm)/ZVI] was characterized by FESEM, TEM, BET, FTIR and XRD. CR adsorption from water using [poly (Gg-AAm)/ZVI] was investigated and several parameters discussed, such as solution pH, contact time, dosage and temperature to find out removal efficiency of polymer composite. The kinetic data for the adsorption of CR followed the pseudo-second-order model and the Langmuir maximum adsorption capacity for CR at pH 7.0 were found to be 153.8, 200 and 250 mg/g at 25, 35 and 45 °C correspondingly. Desorption studies revealed that prepared composite can be used up to three cycles efficiently and thermodynamic parameters such as Gibbs free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) changes showed the adsorption of CR onto [poly (Gg-AAm)/ZVI] was feasible, spontaneous and endothermic.
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Affiliation(s)
- Siva Mohan Reddy Goddeti
- Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.
| | - Madhumita Bhaumik
- Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa
| | - Arjun Maity
- Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.
| | - Suprakas Sinha Ray
- Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa; Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.
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LaRiviere M, Wright C, Arscott W, Miller D, Weber E, Landsburg D, Svoboda J, Nasta S, Gerson J, Chong E, Schuster S, Maity A, Plastaras J. Induction Radiation Prior to Commercial Chimeric Antigen Receptor T-Cell Therapy for Relapsed/Refractory Non-Hodgkin Lymphoma. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.514] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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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Shyamal S, Maity A, Satpati AK, Bhattacharya C. Development of Cu2O thin films under the influence of electrochemical impedance: Applications in improved photoelectrochemical water reduction. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.231] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Moeta PJ, Wesley-Smith J, Maity A, Thwala M. Nano-enabled products in South Africa and the assessment of environmental exposure potential for engineered nanomaterials. SN Appl Sci 2019. [DOI: 10.1007/s42452-019-0584-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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Ngulube T, Gumbo J, Masindi V, Maity A. Preparation and characterisation of high performing magnesite-halloysite nanocomposite and its application in the removal of methylene blue dye. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.02.043] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [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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Midya L, Das R, Bhaumik M, Sarkar T, Maity A, Pal S. Removal of toxic pollutants from aqueous media using poly (vinyl imidazole) crosslinked chitosan synthesised through microwave assisted technique. J Colloid Interface Sci 2019; 542:187-197. [DOI: 10.1016/j.jcis.2019.01.121] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/20/2019] [Accepted: 01/28/2019] [Indexed: 10/27/2022]
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Hajra P, Shyamal S, Mandal H, Sariket D, Maity A, Kundu S, Bhattacharya C. Synthesis of oxygen deficient bismuth oxide photocatalyst for improved photoelectrochemical applications. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.01.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Thomas C, Karagounis I, Srivastava RK, Kumar S, Karar J, Chao HH, Kazimierczak A, Bado I, Nikolos F, Leli N, Koumenis C, Krishnamurthy S, Ueno NT, Chakrabarti R, Maity A. Abstract P5-05-10: Estrogen receptor β suppresses metastasis of inflammatory breast cancer by regulating cell cytoskeleton and cytokine signaling. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p5-05-10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Inflammatory breast cancer (IBC) is the most lethal form of breast cancer that accounts for about 10% of breast cancer mortality annually in US. Poor prognosis is largely due to the high propensity of IBC tumors to develop distant metastasis that occurs directly from the gland epithelium and through lymphatic invasion in which dermal lymphatics are filled with tumor emboli. Owing to the complex metastatic process, the molecular basis of IBC aggressiveness is poorly understood, and no specific therapeutic target has been identified. Despite the lack of estrogen receptor α (ERα) in the majority of IBC tumors, estrogen may still play a role in these cancers through pathways that involve ERβ. Our tissue staining reveals expression of ERβ in more than 50% of IBCs that is reproduced in IBC cell lines. Furthermore, analysis of IBC datasets indicates correlation of receptor expression with good prognosis. We studied this association in preclinical models of IBC by knocking out ERβ in IBC cells. This promotes migration and invasion through cytoskeleton remodeling whereas re-expression of the receptor in knockout cells restores the cytoskeletal structure and migration to the levels of control cells. Consistent with increased migration, deletion of ERβ activates large gene networks of cell de-differentiation and cytokine synthesis that trigger tumor microenvironment responses to promote the motile phenotype of IBC cells. In contrast, ligands that activate the receptor inhibit signaling that contributes to metastasis in IBC. Analysis of an orthotopic xenograft model shows that IBC tumors lacking ERβ have higher propensity for metastasis compared with the ERβ-proficient tumors supporting the anti-metastatic activity of the receptor. Our findings point towards a role of ERβ in preventing distant metastases by inhibiting dissemination of IBC cells and maintaining the integrity of emboli. This function combined with distinct expression indicates the potential of ERβ to represent a unique prognostic marker and therapeutic target that can be utilized to repress IBC metastasis and eliminate its associated mortality.
Citation Format: Thomas C, Karagounis I, Srivastava RK, Kumar S, Karar J, Chao H-H, Kazimierczak A, Bado I, Nikolos F, Leli N, Koumenis C, Krishnamurthy S, Ueno NT, Chakrabarti R, Maity A. Estrogen receptor β suppresses metastasis of inflammatory breast cancer by regulating cell cytoskeleton and cytokine signaling [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P5-05-10.
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Affiliation(s)
- C Thomas
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - I Karagounis
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - RK Srivastava
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - S Kumar
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - J Karar
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - H-H Chao
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - A Kazimierczak
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - I Bado
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - F Nikolos
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - N Leli
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - C Koumenis
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - S Krishnamurthy
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - NT Ueno
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - R Chakrabarti
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
| | - A Maity
- University of Pennsylvania, Philadelphia; The University of Texas MD Anderson Cancer Center, Houston; Baylor College of Medicine, Houston
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Parashar K, Pillay K, Das R, Maity A. Fluoride Toxicity and Recent Advances in Water Defluoridation with Specific Emphasis on Nanotechnology. ACTA ACUST UNITED AC 2019. [DOI: 10.1007/978-3-030-04474-9_9] [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: 03/09/2023]
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Hato MJ, Maponya TC, Ramohlola KE, Modibane KD, Maity A, Monama GR, Makgopa K, Bello A. Polymer-Based Magnetic Nanocomposites for the Removal of Highly Toxic Hexavalent Chromium from Aqueous Solutions. Environmental Chemistry for a Sustainable World 2019. [DOI: 10.1007/978-3-030-04477-0_8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Maity A, Mick R, Huang A, George S, Farwell M, Lukens J, Berman A, Mitchell T, Bauml J, Schuchter L, O'Hara M, Lin L, DeMichele A, Christodouleas J, Haas N, Patsch D, Hahn S, Minn A, Wherry E, Vonderheide R. A Phase I Trial of Pembrolizumab with Hypofractionated Radiation Therapy (HFRT) in Patients with Metastatic Cancers. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.06.147] [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: 10/28/2022]
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Rengan R, Mick R, Pryma D, Lin L, Plastaras J, Simone C, Gupta A, Evans T, Stevenson J, Langer C, Kucharczuk J, Friedberg J, Lam S, Patsch D, Hahn S, Maity A. Long-term Results of a Phase I/II Trial of Nelfinavir with Concurrent Chemoradiotherapy for Locally Advanced Non-Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.06.135] [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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Sharma S, Guttmann D, Small D, Rareshide C, Kurtzman G, Jones J, Shabason J, Alonso-Basanta M, Lustig R, Maity A, Metz J, Lowitz S, Cohen M, Anderson N, Finlay J, Gabriel P, Patel M, Bekelman J. Effect of Introducing a Default Order Option on Unnecessary Daily Image Guidance During Palliative Radiation Therapy: A Cluster Randomized Stepped-Wedge Clinical Trial. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.06.382] [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: 11/16/2022]
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41
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Chigondo M, Paumo HK, Bhaumik M, Pillay K, Maity A. Rapid high adsorption performance of hydrous cerium-magnesium oxides for removal of fluoride from water. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.06.015] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [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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42
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Muliwa AM, Leswifi TY, Maity A, Ochieng A, Onyango MS. Fixed-bed operation for manganese removal from water using chitosan/bentonite/MnO composite beads. Environ Sci Pollut Res Int 2018; 25:18081-18095. [PMID: 29691746 DOI: 10.1007/s11356-018-1993-3] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 04/09/2018] [Indexed: 06/08/2023]
Abstract
In the present study, a new composite adsorbent, chitosan/bentonite/manganese oxide (CBMnO) beads, cross-linked with tetraethyl-ortho-silicate (TEOS) was applied in a fixed-bed column for the removal of Mn (II) from water. The adsorbent was characterised by scanning electron microscopy (SEM), Fourier transform infra-red (FT-IR), N2 adsorption-desorption and X-ray photoelectron spectroscopy (XPS) techniques, and moreover the point of zero charge (pHpzc) was determined. The extend of Mn (II) breakthrough behaviour was investigated by varying bed mass, flow rate and influent concentration, and by using real environmental water samples. The dynamics of the column showed great dependency of breakthrough curves on the process conditions. The breakthrough time (tb), bed exhaustion time (ts), bed capacity (qe) and the overall bed efficiency (R%) increased with an increase in bed mass, but decreased with the increase in both influent flow rate and concentration. Non-linear regression suggested that the Thomas model effectively described the breakthrough curves while large-scale column performance could be estimated by the bed depth service time (BDST) model. Experiments with environmental water revealed that coexisting ions had little impact on Mn (II) removal, and it was possible to achieve 6.0 mg/g breakthrough capacity (qb), 4.0 L total treated water and 651 bed volumes processed with an initial concentration of 38.5 mg/L and 5.0 g bed mass. The exhausted bed could be regenerated with 0.001 M nitric acid solution within 1 h, and the sorbent could be reused twice without any significant loss of capacity. The findings advocate that CBMnO composite beads can provide an efficient scavenging pathway for Mn (II) in polluted water.
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Affiliation(s)
- Anthony M Muliwa
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, South Africa.
| | - Taile Y Leswifi
- Centre for Renewable Energy and Water, Vaal University of Technology, Vanderbijlpark, South Africa
| | - Arjun Maity
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
- DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria, South Africa
| | - Aoyi Ochieng
- Centre for Renewable Energy and Water, Vaal University of Technology, Vanderbijlpark, South Africa
| | - Maurice S Onyango
- Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
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Hoppe BS, Hill-Kayser CE, Tseng YD, Flampouri S, Elmongy HM, Cahlon O, Mendenhall NP, Maity A, McGee LA, Plastaras JP. Consolidative proton therapy after chemotherapy for patients with Hodgkin lymphoma. Ann Oncol 2018; 28:2179-2184. [PMID: 28911093 PMCID: PMC5834068 DOI: 10.1093/annonc/mdx287] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [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: 11/16/2022] Open
Abstract
Background We investigated early outcomes for patients receiving chemotherapy followed by consolidative proton therapy (PT) for the treatment of Hodgkin lymphoma (HL). Patients and methods From June 2008 through August 2015, 138 patients with HL enrolled on either IRB-approved outcomes tracking protocols or registry studies received consolidative PT. Patients were excluded due to relapsed or refractory disease. Involved-site radiotherapy field designs were used for all patients. Pediatric patients received a median dose of 21 Gy(RBE) [range 15–36 Gy(RBE)]; adult patients received a median dose of 30.6 Gy(RBE) [range, 20–45 Gy(RBE)]. Patients receiving PT were young (median age, 20 years; range 6–57). Overall, 42% were pediatric (≤18 years) and 93% were under the age of 40 years. Thirty-eight percent of patients were male and 62% female. Stage distribution included 73% with I/II and 27% with III/IV disease. Patients predominantly had mediastinal involvement (96%) and bulky disease (57%), whereas 37% had B symptoms. The median follow-up was 32 months (range, 5–92 months). Results The 3-year relapse-free survival rate was 92% for all patients; it was 96% for adults and 87% for pediatric patients (P = 0.18). When evaluated by positron emission tomography/computed tomography scan response at the end of chemotherapy, patients with a partial response had worse 3-year progression-free survival compared with other patients (78% versus 94%; P = 0.0034). No grade 3 radiation-related toxicities have occurred to date. Conclusion Consolidative PT following standard chemotherapy in HL is primarily used in young patients with mediastinal and bulky disease. Early relapse-free survival rates are similar to those reported with photon radiation treatment, and no early grade 3 toxicities have been observed. Continued follow-up to assess late effects is critical.
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Affiliation(s)
- B S Hoppe
- Department of Radiation Oncology, University of Florida College of Medicine, Gainesville.,University of Florida Health Proton Therapy Institute, Jacksonville
| | - C E Hill-Kayser
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia
| | - Y D Tseng
- Department of Radiation Oncology, University of Washington, Seattle.,Proton Collaborative Group Registry Membership Site, Warrenville.,Seattle Cancer Care Alliance Proton Therapy Center, Seattle
| | - S Flampouri
- Department of Radiation Oncology, University of Florida College of Medicine, Gainesville
| | - H M Elmongy
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia
| | - O Cahlon
- Proton Collaborative Group Registry Membership Site, Warrenville.,Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York.,Procure Proton Therapy Center, Somerset
| | - N P Mendenhall
- Department of Radiation Oncology, University of Florida College of Medicine, Gainesville.,University of Florida Health Proton Therapy Institute, Jacksonville
| | - A Maity
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia
| | - L A McGee
- Proton Collaborative Group Registry Membership Site, Warrenville.,Mayo Clinic, Scottsdale, USA
| | - J P Plastaras
- Department of Radiation Oncology, University of Pennsylvania, Philadelphia
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Aigbe UO, Ho WH, Maity A, Khenfouch M, Srinivasu V. Removal of hexavalent chromium from wastewater using PPy/Fe3O4 magnetic nanocomposite influenced by rotating magnetic field from two pole three-phase induction motor. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1742-6596/984/1/012008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
Distant metastasis in advanced breast cancer is not uncommon; however, spread to the paranasal sinuses is extremely rare. We present a case of a woman who presented to our ophthalmology colleagues with worsening unilateral proptosis secondary to a tumour mass within her ethmoid sinuses. Biopsy of the ethmoid tumour showed adenocarcinoma of unknown origin. Whole-body positron emission computed tomography demonstrated a breast primary lesion. The patient was treated with palliative chemotherapy, and the patient remains well at this point. The importance of specialist head and neck radiological interpretation of imaging cannot be underestimated. Early tissue diagnosis is essential before ascribing patients with orbital symptoms to non-malignant process.
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Affiliation(s)
- A Maity
- Royal London Hospital , London , UK
| | | | - S Vasani
- Royal London Hospital , London , UK
| | - G Alusi
- Royal London Hospital , London , UK
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Mahato SK, Bhaumik M, Maji A, Dutta A, Maiti D, Maity A. Fe-polyaniline composite nanofiber catalyst for chemoselective hydrolysis of oxime. J Colloid Interface Sci 2018; 513:592-601. [PMID: 29195179 DOI: 10.1016/j.jcis.2017.11.059] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 11/16/2017] [Accepted: 11/17/2017] [Indexed: 11/17/2022]
Abstract
A facile chemoselective one-pot strategy for the deprotection of oxime has been developed using Fe0-polyaniline composite nanofiber (Fe0-PANI), as a catalyst. Nano material based Fe0-PANI catalyst has been synthesized via in-situ polymerization of ANI monomer and followed by reductive deposition of Fe0 onto PANI matrix. The catalyst was characterized by FE-SEM, HR-TEM, BET, XRD, ATR-FTIR, XPS and VSM techniques. The scope of the transformation was studied for aryl, alkyl and heteroarylketoxime with excellent chemoselectivity (>99%). Mechanistic investigations suggested the involvement of a cationic intermediate with Fe3+ active catalytic species. Substituent effect showed a linear free energy relationship. The activation energy (Ea) was calculated to be 17.46 kJ mol-1 for acetophenone oxime to acetophenone conversion. The recyclability of the catalyst demonstrated up to 10 cycles without any significant loss of efficiency. Based on the preliminary experiments a plausible mechanism has been proposed involving a carbocationic intermediate.
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Affiliation(s)
- Sanjit Kumar Mahato
- Department of Civil and Chemical Engineering, University of South Africa (UNISA), PO Box 392, Pretoria 0003, South Africa
| | - Madhumita Bhaumik
- Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa
| | - Arun Maji
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | - Abhijit Dutta
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India.
| | - Arjun Maity
- Department of Civil and Chemical Engineering, University of South Africa (UNISA), PO Box 392, Pretoria 0003, South Africa; Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa; National Centre for Nanostructured Materials, Materials Science and Manufacturing, Council for Scientific and Industrial Research (CSIR), Pretoria, South Africa.
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Sariket D, Shyamal S, Hajra P, Mandal H, Bera A, Maity A, Bhattacharya C. Improvement of photocatalytic activity of surfactant modified In2O3 towards environmental remediation. NEW J CHEM 2018. [DOI: 10.1039/c7nj04645f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
TX-100 surfactant modification of In2O3 semiconductor thin films with better surface coverage and crystallinity for photoelectrochemical applications with improved catalytic properties.
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Affiliation(s)
- Debasis Sariket
- Department of Chemistry
- Indian Institute of Engineering Science & Technology (IIEST)
- Shibpur
- Howrah – 711103
- India
| | - Sanjib Shyamal
- Department of Chemistry
- Indian Institute of Engineering Science & Technology (IIEST)
- Shibpur
- Howrah – 711103
- India
| | - Paramita Hajra
- Department of Chemistry
- Indian Institute of Engineering Science & Technology (IIEST)
- Shibpur
- Howrah – 711103
- India
| | - Harahari Mandal
- Department of Chemistry
- Indian Institute of Engineering Science & Technology (IIEST)
- Shibpur
- Howrah – 711103
- India
| | - Aparajita Bera
- Department of Chemistry
- Indian Institute of Engineering Science & Technology (IIEST)
- Shibpur
- Howrah – 711103
- India
| | - Arjun Maity
- DST/CSIR National Centre for Nanostructured Materials
- Council for Scientific and Industrial Research
- Pretoria-0001
- South Africa
- Department of Applied Chemistry
| | - Chinmoy Bhattacharya
- Department of Chemistry
- Indian Institute of Engineering Science & Technology (IIEST)
- Shibpur
- Howrah – 711103
- India
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Motshekga SC, Sinha Ray S, Maity A. Synthesis and characterization of alginate beads encapsulated zinc oxide nanoparticles for bacteria disinfection in water. J Colloid Interface Sci 2017; 512:686-692. [PMID: 29107919 DOI: 10.1016/j.jcis.2017.10.098] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 10/23/2017] [Accepted: 10/23/2017] [Indexed: 12/19/2022]
Abstract
The use of polymer nanocomposites as novel materials for water remediation has emerged as a promising alternative for disinfection of bacteria contaminated water. Sodium alginate, a natural biopolymer has been investigated in this study by encapsulating antimicrobial zinc oxide nanoparticles supported bentonite. The confirmation of the alginate nanocomposites was done by use of TEM, SEM-EDS and XRD. The antimicrobial activity of the alginate nanocomposites was investigated by batch studies using surface water and synthetic bacteria contaminated water containing Staphylococcus aureus. The effect of nanocomposite amount and initial bacteria concentration has been studied. The inactivation results indicated that the nanocomposite effectively inactivated bacteria in both the synthetic and surface water. With an amount of 0.5 g of the nanocomposites, no bacteria was observed in the water after 70 min of contact time with initial bacteria concentration of 200 cfu/ml for synthetic water and within a min, no bacteria was observed in the water for surface water. It is worth noting that 200 cfu/ml is the bacteria concentration range in which environmental water is likely to contain. Therefore, the results of this study have indicated that the alginate nanocomposites can be deemed as a potential antimicrobial agent for water disinfection.
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Affiliation(s)
- Sarah Constance Motshekga
- DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa.
| | - Suprakas Sinha Ray
- DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa; Department of Applied Chemistry, University of Johannesburg, Doornfontein, 2028 Johannesburg, South Africa.
| | - Arjun Maity
- DST/CSIR National Centre for Nanostructured Materials, Council for Scientific and Industrial Research, Pretoria 0001, South Africa; Department of Applied Chemistry, University of Johannesburg, Doornfontein, 2028 Johannesburg, South Africa.
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Dasgupta R, Ray PP, Maity A, Pradhan D, Sarkar S, Maiti BR. DUAL ACTION OF ARECOLINE ON ADRENAL FUNCTION AND GLUCOSE-GLYCOGEN HOMEOSTASIS IN METABOLIC STRESS IN MICE. Acta Endocrinol (Buchar) 2017; 13:400-409. [PMID: 31149208 DOI: 10.4183/aeb.2017.400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Background People chew betel nut (Areca catechu) for physical work and stress reduction, but it contains arecoline, which has both therapeutic value and untoward effects on endocrine and gonadal functions. Objective Aim of the present study is to investigate its role on adrenal with its target in metabolic stress in mice. Materials and methods Mice were deprived of water / food, each for 5 days / treated with arecoline (10 mg / kg body wt daily for 5 days) / arecoline after water or food deprivation, for 5 days each. Results Water or food-deprivation caused adrenocortical hyperactivity, evident from abundance of enlarged mitochondria and smooth endoplasmic reticulum (SER) with elevation of corticosterone level (C: 68.31 ± 2.30, WD: 159.31 ± 4.10 / FD: 194.12 ± 3.40 μg/ mL). Arecoline treatment alone or in water deprivation (C: 68.31 ± 2.30, AR: 144.50 ± 4.33, AR+WD: 194.42 ± 3.35 μg/ mL) / food deprivation (AR + FD: 180.89 ± 4.51 μg/ mL) stress also stimulated adrenocortical activity as recorded in metabolic stress. In contrast, adrenomedullary activity was not altered following water/ food deprivation. Arecoline treatment alone or in metabolic stress suppressed adrenomedullary activity by showing depletion of chromaffin granules (E/NE?), epinephrine (E) and norepinephrine (NE) concentrations. Both the stress decreased blood glucose and liver glycogen levels. Arecoline treatment decreased blood glucose level, with a rise in liver glycogen level, but elevated blood glucose level in water deprivation unlike in starvation. Conclusion Arecoline alone or in metabolic stress involves adrenal and probably other endocrine glands (pancreas, posterior pituitary and rennin-angiotensin system) to maintain homeostasis in metabolic stress in mice.
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Affiliation(s)
- R Dasgupta
- University of Calcutta, Department of Zoology, Calcutta, India
| | - P Paramita Ray
- Bangabasi College, Department of Zoology, Calcutta, India
| | - A Maity
- University of Calcutta, Department of Zoology, Calcutta, India
| | - D Pradhan
- University of Calcutta, Department of Zoology, Calcutta, India
| | - S Sarkar
- City College, Department of Zoology, Calcutta, India
| | - B R Maiti
- University of Calcutta, Department of Zoology, Calcutta, India
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Tseng Y, Hoppe B, Miller D, Maity A, Nanda R, Mendenhall N, Flampouri S, Mohindra P, Hartsell W, Vargas C, Plastaras J. Rates of Toxicity and Outcomes After Mediastinal Proton Therapy For Relapsed/Refractory Lymphoma. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.155] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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