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Iktidar MA, Sakib MM, Munni UR, Rimti FH, Yousuf R, Majumder K, Saha T, Golpo FL, Sayed MSU, Monsur S, Al Galib A, Hossain MK, Shupti SA, Nawar N, Mazumder S, Hasan MT. Correction: Medical students' career preferences in Bangladesh. BMC Med Educ 2024; 24:206. [PMID: 38419012 PMCID: PMC10902954 DOI: 10.1186/s12909-024-05189-5] [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] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Affiliation(s)
- Mohammad Azmain Iktidar
- Directorate General of Health Services, Dhaka, Bangladesh.
- Department of Public Health, North South University, Plot # 15, Block # B, Bashundhara R/A, 1229, Dhaka, Bangladesh.
- School of Research, Chattogram, Bangladesh.
| | - Md Muid Sakib
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | | | - Fahmida Hoque Rimti
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Renessa Yousuf
- School of Research, Chattogram, Bangladesh
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Koushik Majumder
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Tirtha Saha
- Rajshahi Medical College and Hospital, 6000, Rajshahi, Bangladesh
| | | | - Md Samee U Sayed
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Sabrina Monsur
- Dhaka Medical College Hospital, 1000, Ramna, Dhaka, Bangladesh
| | - Asadul Al Galib
- Sir Salimullah Medical College and Mitford Hospital, 1100, Mitford, Dhaka, Bangladesh
| | - Md Kamran Hossain
- IBN Sina Medical College and Hospital, 1216, Kallyanpur, Dhaka, Bangladesh
| | - Sigma Alam Shupti
- Mymensingh Medical College and Hospital, Chorpara, Mymensingh, Bangladesh
| | - Noshin Nawar
- School of Research, Chattogram, Bangladesh
- University of Chittagong, Chattogram, Bangladesh
| | - Sudeshna Mazumder
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - M Tasdik Hasan
- Action Lab, Department of Human Centred Computing, Faculty of Information Technology, Monash University, Melbourne, Australia
- Department of Public Health, State University of Bangladesh (SUB), Dhaka, Bangladesh
- Public Health Foundation, Bangladesh (PHF, BD), Dhaka, Bangladesh
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Rao AP, Nawar N, Annesley CJ. Machine Learning-Assisted Determination of C 6H 14 Mole Fraction From Molecular Emissions of Laser-Induced Hexane-Air Plasmas. Appl Spectrosc 2024:37028241233309. [PMID: 38403921 DOI: 10.1177/00037028241233309] [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: 02/27/2024]
Abstract
Laser-induced plasmas of materials containing hydrocarbons present strong carbon molecular emission features. Using these emissions to build models relating changes in spectral features to a physical parameter of the system, such as hydrocarbon content, can be difficult because of the dynamic complexity of the spectral features and temperature disequilibrium between molecular species. This study presents machine learning models trained to quantify the mole fraction of hexane in hexane-air plasmas from CN Violet and C2 Swan spectral features. Ensemble regression methods provide the most accurate predictions with root mean squared error on the order 10-2. Artificial neural network regressions produce predictions with superlative sensitivity, exhibiting detection limits as low as 0.008. These foundational models can be further refined with more advanced data to quantify the presence of carbon species in complex plasma environments, such as high-speed reacting flows.
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Affiliation(s)
- Ashwin P Rao
- Space Vehicles Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico, USA
| | - Noshin Nawar
- Institute for Scientific Research, Boston College, Chestnut Hill, Massachusets, USA
| | - Christopher J Annesley
- Space Vehicles Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico, USA
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Iktidar MA, Sakib MM, Munni UR, Rimti FH, Yousuf R, Majumder K, Saha T, Golpo FL, Sayed MSU, Monsur S, Al Galib A, Hossain MK, Shupti SA, Nawar N, Mazumder S, Hasan MT. Medical students' career preferences in Bangladesh. BMC Med Educ 2024; 24:81. [PMID: 38263095 PMCID: PMC10804597 DOI: 10.1186/s12909-024-05050-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 01/10/2024] [Indexed: 01/25/2024]
Abstract
AIM This study aimed to investigate the career preferences among Bangladeshi medical students, identify the factors that influence their present choices, and additionally report the role of gender and academic year behind their decisions. METHODS This cross-sectional study conducted in Bangladesh from August 2022 to April 2023 included 801 medical students conveniently selected from medical colleges in eight divisions. Data were collected using a web-based survey and analysed using STATA version 16.0. Statistical tests included the Kolmogorov-Smirnov test, arithmetic mean, standard deviation, frequency, and Kruskal-Wallis H test. The response rate was 94.6%, and the CHERRIES guideline was followed for reporting the results. RESULT The majority of the participants were female (64.42%) and under the age of 23 years (58.8%). The study revealed that medicine was the preferred career choice for the majority of students (65%), with surgery being the most popular first choice (30.21%) among them. Female medical students showed a significantly higher preference for gynaecology & obstetrics (p < 0.001), while male students had a significantly higher tendency to choose general practice (p = 0.002). There is a significant gender difference (p < 0.05) in the career preference factors, including professional prestige, role model influence, easy money, family time, promotion opportunities, income for lifestyle, and research opportunities. Academic year differences were also observed, with increasing interest in medicine and public health (p < 0.001), a decrease in interest in surgery (p < 0.001), and a decline in preference for non-medical careers as students progressed through their MBBS life (p < 0.05). CONCLUSION Overall, medicine was the most popular speciality choice, however, male students preferred general practice and female students preferred gynaecology and obstetrics more. Personal passion, opportunities for contribution to society, professional prestige, having a direct dealing with patients, and income will allow an enjoyable lifestyle were the most important factors in the choice of their career.
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Affiliation(s)
- Mohammad Azmain Iktidar
- Directorate General of Health Services, Dhaka, Bangladesh.
- Department of Public Health, North South University, Plot # 15, Block # B, Bashundhara R/A, 1229, Dhaka, Bangladesh.
- School of Research, Chattogram, Bangladesh.
| | - Md Muid Sakib
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | | | - Fahmida Hoque Rimti
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Renessa Yousuf
- School of Research, Chattogram, Bangladesh
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Koushik Majumder
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Tirtha Saha
- Rajshahi Medical College and Hospital, 6000, Rajshahi, Bangladesh
| | | | - Md Samee U Sayed
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - Sabrina Monsur
- Dhaka Medical College Hospital, 1000, Ramna, Dhaka, Bangladesh
| | - Asadul Al Galib
- Sir Salimullah Medical College and Mitford Hospital, 1100, Mitford, Dhaka, Bangladesh
| | - Md Kamran Hossain
- IBN Sina Medical College and Hospital, 1216, Kallyanpur, Dhaka, Bangladesh
| | - Sigma Alam Shupti
- Mymensingh Medical College and Hospital, Chorpara, Mymensingh, Bangladesh
| | - Noshin Nawar
- School of Research, Chattogram, Bangladesh
- University of Chittagong, Chattogram, Bangladesh
| | - Sudeshna Mazumder
- Chattogram Medical College, 57 K.B. Fazlul Kader Road, 4203, Chattogram, Bangladesh
| | - M Tasdik Hasan
- Action Lab, Department of Human Centred Computing, Faculty of Information Technology, Monash University, Melbourne, Australia
- Department of Public Health, State University of Bangladesh (SUB), Dhaka, Bangladesh
- Public Health Foundation, Bangladesh (PHF, BD), Dhaka, Bangladesh
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Nawar N, Paul A, Mahmood HN, Faisal MI, Hosen MI, Shekhar HU. Structure analysis of deleterious nsSNPs in human PALB2 protein for functional inference. Bioinformation 2021; 17:424-438. [PMID: 34092963 PMCID: PMC8131579 DOI: 10.6026/97320630017424] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/15/2021] [Accepted: 03/18/2021] [Indexed: 11/23/2022] Open
Abstract
Partner and Localizer of BRCA2 or PALB2 is a typical tumor suppressor protein, that responds to DNA double stranded breaks through homologous recombination repair. Heterozygous mutations in PALB2 are known to contribute to the susceptibility of breast and ovarian cancer. However, there is no comprehensive study characterizing the structural and functional impacts of SNPs located in the PALB2 gene. Therefore, it is of interest to document a comprehensive analysis of coding and non-coding SNPs located at the PALB2 loci using in silico tools. The data for 1455 non-synonymous SNPs (nsSNPs) located in the PALB2 loci were retrieved from the dbSNP database. Comprehensive characterization of the SNPs using a combination of in silico tools such as SIFT, PROVEAN, PolyPhen, PANTHER, PhD-SNP, Pmut, MutPred 2.0 and SNAP-2, identified 28 functionally important SNPs. Among these, 16 nsSNPs were further selected for structural analysis using conservation profile and protein stability. The most deleterious nsSNPs were documented within the WD40 domain of PALB2. A general outline of the structural consequences of each variant was developed using the HOPE project data. These 16 mutant structures were further modelled using SWISS Model and three most damaging mutant models (rs78179744, rs180177123 and rs45525135) were identified. The non-coding SNPs in the 3' UTR region of the PALB2 gene were analyzed for altered miRNA target sites. The comprehensive characterization of the coding and non-coding SNPs in the PALB2 locus has provided a list of damaging SNPs with potential disease association. Further validation through genetic association study will reveal their clinical significance.
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Affiliation(s)
- Noshin Nawar
- Clinical Biochemistry and Translational Medicine Laboratory, Department of Biochemistry and Molecular Biology, University of Dhaka, Bangladesh
| | - Anik Paul
- Clinical Biochemistry and Translational Medicine Laboratory, Department of Biochemistry and Molecular Biology, University of Dhaka, Bangladesh
| | - Hamida Nooreen Mahmood
- Clinical Biochemistry and Translational Medicine Laboratory, Department of Biochemistry and Molecular Biology, University of Dhaka, Bangladesh
| | - Md Ismail Faisal
- Clinical Biochemistry and Translational Medicine Laboratory, Department of Biochemistry and Molecular Biology, University of Dhaka, Bangladesh
| | - Md Ismail Hosen
- Clinical Biochemistry and Translational Medicine Laboratory, Department of Biochemistry and Molecular Biology, University of Dhaka, Bangladesh
| | - Hossain Uddin Shekhar
- Clinical Biochemistry and Translational Medicine Laboratory, Department of Biochemistry and Molecular Biology, University of Dhaka, Bangladesh
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Nawar N. Structure analysis of deleterious nsSNPs in human PALB2 protein for functional inference. Bioinformation 2021. [DOI: 10.6026//97320630017424] [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: 11/23/2022] Open
Abstract
Partner and Localizer of BRCA2 or PALB2 is a typical tumor suppressor protein, that responds to DNA double stranded breaks through homologous recombination repair. Heterozygous mutations in PALB2 are known to contribute to the susceptibility of breast and ovarian cancer. However, there is no comprehensive study characterizing the structural and functional impacts of SNPs located in the PALB2 gene.Therefore, it is of interest to document a comprehensive analysis of coding and non-coding SNPs located at the PALB2 loci using in silico tools. The data for 1455 non-synonymous SNPs (nsSNPs) located in the PALB2 loci were retrieved from the dbSNP database. Comprehensive characterization of the SNPs using a combination of in silico tools such as SIFT, PROVEAN, PolyPhen, PANTHER, PhDSNP, Pmut, MutPred 2.0 and SNAP-2, identified 28 functionally important SNPs. Among these, 16 nsSNPs were further selected for structural analysis using conservation profile and protein stability. The most deleterious nsSNPs were documented within the WD40 domain of PALB2. A general outline of the structural consequences of each variant was developed using the HOPE project data. These 16 mutant structures were further modelled using SWISS Model and three most damaging mutant models (rs78179744, rs180177123 and rs45525135) were identified. The non-coding SNPs in the 3’ UTR region of the PALB2 gene were analyzed for altered miRNA target sites. The comprehensive characterization of the coding and non-coding SNPs in the PALB2 locus has provided a list of damaging SNPs with potential disease association. Further validation through genetic association study will reveal their clinical significance.
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Nayak R, Nawar N, Webb J, Fatemi M, Alizad A. Impact of imaging cross-section on visualization of thyroid microvessels using ultrasound: Pilot study. Sci Rep 2020; 10:415. [PMID: 31942039 PMCID: PMC6962275 DOI: 10.1038/s41598-019-57330-w] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 12/13/2019] [Indexed: 11/10/2022] Open
Abstract
Non-invasive, contrast-free microvascular imaging of human thyroids can be potentially beneficial in reducing the large number of benign biopsies of suspicious nodules. However, motion incurred by thyroid due to its proximity to the pulsating carotid artery significantly impacts the visualization of blood flow in small vessels. Singular value based spatiotemporal clutter filtering (SVD-STF) improves the performance of tissue rejection in the presence of motion. However, despite effective clutter filtering, motion in thyroid imaging can impact coherent integration of the Doppler ensemble and degrade the visualization of the underlying vasculature. Recently studies have demonstrated that motion correction using 2D normalized cross-correlation based speckle tracking can address this issue, however, only in-plane motion can be tracked and corrected. Given the natural anatomical orientation of the rigid trachea, thyroid and the pulsating carotid artery, we hypothesize that imaging of thyroid microvessels may be more reliable in the longitudinal view than in the transverse. Specifically, distal presence of rigid trachea can limit out-of-plane motion in the longitudinal view. We tested this hypothesis on 48 acquisitions obtained from 24 thyroid patients having at least one suspicious nodule. In each patient, ultrasound images of the thyroid were acquired in both longitudinal and transverse views. Compounded plane-wave imaging was used to acquire the ultrasound images at high frame-rate, which is important for contrast-free small vessel blood flow imaging. Thyroid motion was tracked using 2D normalized cross-correlation based speckle tracking. Tissue clutter was rejected using singular value decomposition based spatiotemporal clutter filtering. The clutter-filtered Doppler ensemble was motion corrected prior to slow-time power Doppler integration. Signal-to-noise and contrast-to-noise ratios were computed to assess the improvement in quality of the power Doppler images. Out-of-plane motion was detected by estimating normalized ensemble cross-correlation coefficient. The results demonstrated that motion associated with the thyroid due to the carotid artery was primarily in the lateral direction, which could be estimated and corrected using 2D speckle tracking. However, the motion in the transverse view displayed increased speckle decorrelation. The average ensemble cross-correlation coefficient of the thyroid ultrasound images were significantly higher (p < 0.05) in the longitudinal view than in the transverse view. The largest improvement in SNR and CNR of the estimated PD images upon motion correction was observed in the longitudinal view (12.95 ± 3.76 dB and 16.48 ± 4.6 dB) than in the transverse view (3.72 ± 0.894 dB and 6.217 ± 1.689 dB). These preliminary results show that motion encountered by the thyroid due to carotid pulsations can be effectively tracked and corrected in the longitudinal view relative to transverse, which is important for reliably visualizing the underlying blood flow.
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Affiliation(s)
- Rohit Nayak
- Department of Radiology, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, 55905, United States
| | - Noshin Nawar
- Department of Radiology, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, 55905, United States
| | - Jeremy Webb
- Department of Radiology, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, 55905, United States
| | - Mostafa Fatemi
- Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, 55905, United States
| | - Azra Alizad
- Department of Radiology, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, 55905, United States.
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Ghonge T, Ceylan Koydemir H, Valera E, Berger J, Garcia C, Nawar N, Tiao J, Damhorst GL, Ganguli A, Hassan U, Ozcan A, Bashir R. Smartphone-imaged microfluidic biochip for measuring CD64 expression from whole blood. Analyst 2019; 144:3925-3935. [PMID: 31094395 DOI: 10.1039/c9an00532c] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Sepsis, a life-threatening syndrome that contributes to millions of deaths annually worldwide, represents a moral and economic burden to the healthcare system. Although no single, or even a combination of biomarkers has been validated for the diagnosis of sepsis, multiple studies have shown the high specificity of CD64 expression on neutrophils (nCD64) to sepsis. The analysis of elevated nCD64 in the first 2-6 hours after infection during the pro-inflammatory stage could significantly contribute to early sepsis diagnosis. Therefore, a rapid and automated device to periodically measure nCD64 expression at the point-of-care (POC) could lead to timely medical intervention and reduced mortality rates. Current accepted technologies for measuring nCD64 expression, such as flow cytometry, require manual sample preparation and long incubation times. For POC applications, however, the technology should be able to measure nCD64 expression with little to no sample preparation. In this paper, we demonstrate a smartphone-imaged microfluidic biochip for detecting nCD64 expression in under 50 min. In our assay, first unprocessed whole blood is injected into a capture chamber to immunologically capture nCD64 along a staggered array of pillars, which were previously functionalized with an antibody against CD64. Then, an image of the capture channel is taken using a smartphone-based microscope. This image is used to measure the cumulative fraction of captured cells (γ) as a function of length in the channel. During the image analysis, a statistical model is fitted to γ in order to extract the probability of capture of neutrophils per collision with a pillar (ε). The fitting shows a strong correlation with nCD64 expression measured using flow cytometry (R2 = 0.82). Finally, the applicability of the device to sepsis was demonstrated by analyzing nCD64 from 8 patients (37 blood samples analyzed) along the time they were admitted to the hospital. Results from this analysis, obtained using the smartphone-imaged microfluidic biochip were compared with flow cytometry. Again, a correlation coefficient R2 = 0.82 (slope = 0.99) was obtained demonstrating a good linear correlation between the two techniques. Deployment of this technology in ICU could significantly enhance patient care worldwide.
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Affiliation(s)
- Tanmay Ghonge
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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Abstract
Non-activated carbon has been prepared by carbonizing waste products manufactured from phenol formaldehyde at 1073 K in a nitrogen atmosphere. Activated carbons were obtained by gasifying the non-activated product with air at 673 K, or with steam at 1173 K, to different levels of burn-off. The adsorption of nitrogen at 77 K and of carbon dioxide at 298 K was measured for all the carbons prepared using volumetric apparatus. The adsorption of iso-octane and α-pinene at 320 K was carried out gravimetrically using silica spring balances. The adsorption of methylene blue and of phenol from their aqueous solutions was determined spectrophotometrically. The adsorption of ammonia from its aqueous solution at 308 K was determined colorimetrically. The surface area of the activated carbons increased with increasing percentage burn-off to reach a maximum and then decreased with further increase in percentage burn-off. Gasification with oxidizing gases changed the porosity of the carbon with the change depending on the extent of gasification. The adsorption of iso-octane and α-pinene increased with increasing percentage burn-off as a result of pore widening. The low burn-off carbons obtained from phenol formaldehyde wastes are characterized by extremely high surface areas and microporosity, and a high CO/CO2 ratio on outgassing. The carbons exhibit high phenol adsorption capacities. Ammonia adsorption is favoured on carbons of a low CO/CO2 ratio.
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Affiliation(s)
- A.M. Youssef
- Chemistry Department, Faculty of Science, University of Mansoura, Mansoura 35516, Egypt
| | - M.N. Alaya
- Chemistry Department, Faculty of Science, University of Mansoura, Mansoura 35516, Egypt
| | - N. Nawar
- Chemistry Department, Faculty of Science, University of Mansoura, Mansoura 35516, Egypt
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El-Nabarawy T, Khalil L, Hamada M, Nawar N. Surface, Acidic and Catalytic Properties of Silica—Alumina Catalysts in Relation to Their Chemical Composition. ADSORPT SCI TECHNOL 2016. [DOI: 10.1177/026361749701500206] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Silica–alumina catalysts of varying chemical compositions were prepared under controlled conditions, employing the coprecipitation technique. The surface properties were determined from the adsorption of nitrogen at 77 K. The acidity was investigated by determining the adsorption of pyridine at 423 K and by following its thermal desorption up to 773 K. The conversion of 2-propanol at 523 K and the cracking of cumene at 693 K were investigated using the pulse microcatalytic technique. The surface area decreased and the mean pore volume increased with increasing alumina content. The amount of acid present and its surface density increased while the relative acid strength decreased with an increase in the alumina content. The extent of dehydration of 2-propanol increased with increasing surface acid density and proved to be insensitive to the acid strength. The cracking of cumene appears to depend on the surface area, the amount of acid present and the acid strength of the catalyst, although its dependence on these parameters is of a relative complex nature.
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Affiliation(s)
- Th. El-Nabarawy
- Laboratory of Surface Chemistry and Catalysis, National Research Centre, Dokki, Cairo, Egypt
| | - L.B. Khalil
- Laboratory of Surface Chemistry and Catalysis, National Research Centre, Dokki, Cairo, Egypt
| | - M.A. Hamada
- Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
| | - N. Nawar
- Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
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Nawar N, El-Swwah I, Hosny N, Mostafa M. Novel mono- and binuclear complexes derived from N-benzoyl-N-glycylthiourea (BGH) with some transition metal ions. ARAB J CHEM 2015. [DOI: 10.1016/j.arabjc.2011.06.002] [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] Open
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Bekheit M, Nawar N, Addison A, Abdel-Latif D, Monier M. Preparation and characterization of chitosan-grafted-poly(2-amino-4,5-pentamethylene-thiophene-3-carboxylic acid N′-acryloyl-hydrazide) chelating resin for removal of Cu(II), Co(II) and Ni(II) metal ions from aqueous solutions. Int J Biol Macromol 2011; 48:558-65. [DOI: 10.1016/j.ijbiomac.2011.01.018] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 01/15/2011] [Accepted: 01/22/2011] [Indexed: 10/18/2022]
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Monier M, Nawar N, Abdel-Latif DA. Preparation and characterization of chelating fibers based on natural wool for removal of Hg(II), Cu(II) and Co(II) metal ions from aqueous solutions. J Hazard Mater 2010; 184:118-125. [PMID: 20810212 DOI: 10.1016/j.jhazmat.2010.08.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 07/29/2010] [Accepted: 08/06/2010] [Indexed: 05/14/2023]
Abstract
The graft copolymerization of acrylonitrile (AN) onto natural wool fibers initiated by KMnO(4) and oxalic acid combined redox initiator system in limited aqueous medium was carried out in heterogeneous media. Moreover, modification of the grafted wool fibers was done by changing the nitrile group (-CN) into cyano-acetic acid α-amino-acrylic-hydrazide through the reaction with hydrazine hydrate followed by ethylcyanoacetate which eventually produce wool-grafted-poly(cyano-acetic acid α-amino-acrylic-hydrazide) (wool-g-PCAH) chelating fibers. The application of the modified fibers for metal ion uptake was studied using Hg(2+), Cu(2+) and Co(2+). The modified chelating fibers were characterized using FTIR spectroscopy, SEM and X-ray diffraction.
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Affiliation(s)
- M Monier
- Chemistry Department, Faculty of Science, Mansoura University, 35516, Egypt.
| | - N Nawar
- Chemistry Department, Faculty of Science, Mansoura University, 35516, Egypt.
| | - D A Abdel-Latif
- Chemistry Department, Faculty of Science, Mansoura University, 35516, Egypt
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Nawar N, Khattab MA, Hosny NM. Some Metal(II) Complexes of O-Aminoacetophenone Benzoylhydrazone (Aabh): Their Preparation, Characterization and Antimicrobial Activity. ACTA ACUST UNITED AC 1999. [DOI: 10.1080/00945719909351705] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [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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Nawar N, Hosny NM. Transition metal complexes of 2-acetylpyridine o-hydroxybenzoylhydrazone (APo-OHBH): their preparation, characterisation and antimicrobial activity. Chem Pharm Bull (Tokyo) 1999; 47:944-9. [PMID: 10434397 DOI: 10.1248/cpb.47.944] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Coordination compounds of some transition metal ions with 2-acetylpyridene-o-hydroxybenzoylhydrazone (APo-OHBH) were synthesized. Their structures have been characterised by elemental analyses, electrical conductance, magnetic moments (at 25 degrees C) and spectral (IR, UV, NMR) studies. The fast atom bombardment (FAB) method was used for obtaining mass spectra of the positive ion FAB studies of the ligand and some metal complexes. The thermal behaviour of selected complexes was investigated by thermal gravimetrical analysis (TGA) and differential thermal analysis (DTA) techniques. The IR spectra show that the ligand acts in a neutral bidentate, neutral tridentate and/or mononegative tridentate fashion depending on the metal salt used and the medium of the reaction. Preliminary pharmacological tests on the ligand and its complexes showed some antimicrobial activity.
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Affiliation(s)
- N Nawar
- Chemistry Department, Faculty of Science, Mansoura University, Egypt
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Cotton FA, Dikarev EV, Nawar N, Wong WY. W2Cl4(NR2)2(PR‘3)2 Molecules. 4. A New Synthetic Route to Products with a Staggered Conformation. Preparations and Characterizations of W2Cl4(NR2)2(PR‘3)2 (R = Et, Bu, Hex; R‘3 = Me3, Et2H) and an Intermediate Complex W2Cl4(NEt2)2(NHEt2)2. Inorg Chem 1997. [DOI: 10.1021/ic9610694] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- F. Albert Cotton
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, College Station, Texas 77843-3255, and Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
| | - Evgeny V. Dikarev
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, College Station, Texas 77843-3255, and Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
| | - N. Nawar
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, College Station, Texas 77843-3255, and Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
| | - Wai-Yeung Wong
- Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, College Station, Texas 77843-3255, and Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
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