145 results on '"Khan, FN"'
Search Results
2. Response surface approach to minimize the residual stresses in full penetration pulsed TIG weldments of Ti-5Al-2.5Sn alloy
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Khan, FN, primary, Junaid, Massab, additional, Baig, MN, additional, and Haider, J, additional
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- 2018
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3. Integrated management of fusarium wilt of gladiolus
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Yasmin, L, primary, Ali, MA, primary, and Khan, FN, primary
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- 2018
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4. Efficacy of fungicides in controlling fusarium wilt of gladiolus
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Yasmin, L, primary, Ali, MA, primary, and Khan, FN, primary
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- 2018
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5. Investigating tool performance and wear when simulating bandsawing of nickel-based superalloy under interrupted orthogonal turning condition
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Khan, FN, Haider, J, Persson, M, Khan, FN, Haider, J, and Persson, M
- Abstract
© 2017, IMechE 2017. The manufacturing industries still face the most challenging job at hand to machine nickel-based superalloy, Inconel 718, efficiently and economically. In contrast to the extensive research efforts in secondary machining processes such as turning, milling and drilling, very little or no attention is paid on bandsawing of Inconel 718. This article presents an experimental investigation of machining Inconel 718 using carbide-tipped bandsaw teeth in a custom-made experimental facility. Cutting forces were measured during the bandsawing operation using a dynamometer, and the wear modes and mechanisms in the bandsaw teeth were investigated in a scanning electron microscope. Three different feeds or depths of cut (10, 20 and 30 μm) were employed with a cutting speed of 30 m/min during the machining tests. At smaller feed or depth of cut (10 μm), abrasive wear, adhesive wear and some degree of plastic deformation were identified as the governing mechanisms of tool wear. The higher depth of cut (30 μm) could cause cracking, chipping or premature failure of the carbide tip in bandsaw tooth. Strong welding of workpiece material to the cutting edge formed a built-up edge, which would impair the bandsawability due to the modification of the cutting edge. The higher depth of cut significantly improved the machining performance due to the reduction in specific cutting energy. However, it was not recommended to apply higher depth of cut as there were obvious possibilities of premature tooth failure. Machining force and specific cutting energy results along with chip characteristics were correlated with the tool performance and tool wear. The results of this investigation would be helpful for bandsaw manufacturers and end users to get a fundamental understanding of the bandsawability of Inconel 718 with the carbide-tipped bandsaw.
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- 2017
6. A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet
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Junaid, M, Baig, MN, Shamir, M, Khan, FN, Rehman, K, Haider, J, Junaid, M, Baig, MN, Shamir, M, Khan, FN, Rehman, K, and Haider, J
- Abstract
Pulsed Nd:YAG laser beam welding (P-LBW) and pulsed tungsten inert gas (P-TIG) welding were used to prepare full penetration bead-on-plate weldments of 1.6 mm thick Ti-5Al-2.5Sn alpha titanium alloy sheet. The influence of welding phenomenon on the microstructure, micro-hardness, tensile properties, surface and sub-surface residual stress distribution and deformation and distortion of both the weldments were studied. Higher cooling rate in P-LBW resulted in complete α’ martensitic transformation in fusion zone whereas in P-TIG weldment α’ and acicular α was formed within equiaxed β matrix due to lower cooling rate. Hardness in fusion zone of P-LBW was higher than that of the fusion zone of P-TIG weldment due to faster cooling rate in P-LBW. The welded zone in both the weldments showed higher hardness and strength than that of the parent metal since a ductile fracture occurred in the un-welded section during tensile testing. Residual stresses in both P-LBW and P-TIG weldments showed similar trend but the distribution was much narrower in P-LBW due to less width of heat affected zone. P-LBW resulted in more nonuniformity in through thickness stress profile because of greater top to bottom width ratio. Less residual stresses, deformation and distortion and superior mechanical properties in P-LBW made the process more feasible than P-TIG for the welding of Ti-5Al-2.5Sn alloy sheet.
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- 2017
7. Machining characteristics of inconel with carbide tipped bandsaw
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Khan, FN, Daadbin, A, Persson, M, and Haider, J
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stomatognathic system - Abstract
Bandsawing is generally preferred over other sawing techniques (e.g., circular sawing) owing to its lower kerf width, higher metal removal rate and competitive surface finish. Investigations on machining Inconel alloys are generally limited to turning or milling processes with very little or no attention paid on bandsawing Inconel. The paper presents an experimental investigation on machining Inconel 718 using carbide tipped bandsaw teeth. The machining tests were carried out using a modified machine tool with a single bandsaw tooth. Cutting forces were measured during the bandsawing operation and the wear modes and mechanisms in the bandsaw teeth were investigated in a Scanning Electron Microscope (SEM). Abrasive wear, adhesive wear and some degree of plastic deformation were identified as the main wear mechanisms on the flank face of the bandsaw teeth. The higher depths of cut applied during machining could cause chipping or premature failure of the carbide tip in bandsaw tooth.
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- 2014
8. Response surface approach to minimize the residual stresses in full penetration pulsed TIG weldments of Ti-5Al-2.5Sn alloy
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Khan, FN, Junaid, Massab, Baig, MN, and Haider, J
- Abstract
Pulsation of current in tungsten inert gas (TIG) welding is employed to obtain good quality weldments. Peak current, background current, and welding speed in TIG welding are important parameters and their effects on the induced residual stresses are studied using Box–Behnken design methodology. The location of maximum residual stress was found to be close to the weld centerline. Longitudinal and transverse residual stresses at this location were found to be dependent on the pulsed TIG welding input parameters. However, using design of experiment approach, welding speed was found to have the most dominant influence on the stress values. In order to minimize the residual stresses, a reduction in heat input also led to reduction of weld pool penetration. The results of multiresponse optimization showed that in order to achieve a full penetration weldment, a minimum value of 235 MPa for longitudinal and 84 MPa for transverse residual stress will be attained. A weldment with these features can be obtained by using a high value of peak current and a high value of welding speed.
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- 2019
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9. Development of AlTiN coated carbide bandsaw for machining titanium-17 alloy
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Khan, FN, Daadbin, A, Persson, M, Haider, J, Khan, FN, Daadbin, A, Persson, M, and Haider, J
- Abstract
Economical and efficient machining of titanium alloys has always been a challenge for the metal cutting industry owing to their poor machinability characteristics, such as high reactivity with tool materials. In recent years, aluminium titanium nitride (AlTiN) coating has attracted increasing attention over traditional TiN coating, due to its superior properties. Bandsawing of titanium alloys has not been investigated in a greater detail compared to other machining operations such as turning, milling and drilling. In the present investigation, AlTiN coating was deposited onto carbide tipped bandsaw teeth and the coating properties were assessed. A modified lathe machine was used for performing the machining tests. Forces experienced by the bandsaw teeth during the machining tests were measured and specific cutting energy was calculated. The results showed that the AlTiN coated bandsaw teeth performed better than the un-coated bandsaw teeth in terms of wear length, force and specific cutting energy. Copyright © 2014 Inderscience Enterprises Ltd..
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- 2014
10. Effects of nitrogen and potassium on growth and yield of gladiolus corms
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Khan, FN, primary, Rahman, MM, primary, Karim, AJMS, primary, and Hossain, KM, primary
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- 2013
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11. Endoscopic therapy in children with pancreas divisium presenting with acute pancreatitis or chronic abdominal pain
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Catalano, MF, primary, Khan, FN, additional, Hogan, WJ, additional, and Geenen, JE, additional
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- 1998
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12. TRADITIONAL & PSYCHOSOCIAL RISK FACTORS FOR CAROTID ATHEROSCLEROSIS IN THE ELDERLY
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Khan, FN, primary, Fields, JZ, additional, Payne, K, additional, Clark, E, additional, Pomerantz, R, additional, Alexander, CN, additional, and Schneider, RH, additional
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- 1998
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13. The use of CRP within a clinical prediction algorithm for the differentiation of septic arthritis and transient synovitis in children.
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Singhal R, Perry DC, Khan FN, Cohen D, Stevenson HL, James LA, Sampath JS, and Bruce CE
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- 2011
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14. Wide dynamic range OSNR monitoring for RZ-DQPSK systems using delay-tap sampling technique
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Wai, Pka, Lu, C., Pak Tao Alan LAU, and Khan, Fn
15. Optical performance monitoring using statistical signal processing
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Chao LU, Khan, Fn, Shen, Tsr, Sui, Q., and Lau, Apt
16. Compartment syndrome of lower leg associated with undisplaced fibula fracture.
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Khan, FN, Bidwai, ASC, and Atkinson, D
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- 2011
17. Prevention of recurrent attacks of pancreatitis in patients with cystic fibrosis: The role of endoscopic therapy
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Dahman, B, Khan, FN, Geenen, JE, Hogan, WJ, Johnson, GK, Schmalz, MJ, Geenen, DJ, and Catalano, MF
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- 1996
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18. Building supportive networks: Insights from a division mentorship workshop.
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Tylee TS, Khan FN, Nguyen T, and Narla RR
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- 2024
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19. Preoperative survey to evaluate the patients' allergy list and its relevance to perioperative care.
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Elmitwalli I, Khan FN, Redmond M, Rice-Weimer J, Yemele Kitio SA, and Tobias JD
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- Humans, Child, Adolescent, Child, Preschool, Female, Male, Surveys and Questionnaires, Preoperative Care methods, Cohort Studies, Drug Hypersensitivity epidemiology, Electronic Health Records, Perioperative Care methods
- Abstract
Introduction: Perioperative hypersensitivity and allergic reactions can result in significant morbidity and mortality. For routine anesthetic care, allergies are determined from a review of the electronic medical record supplemented by a detailed patient history. Although the electronic medical record is generally assumed to be accurate, it may be that allergies are erroneously listed or not based on sound medical practice. The purpose of the current study is to evaluate allergies listed in the electronic medical record of children presenting for surgery and determine their origin, authenticity, and impact on perioperative care., Methods: Eligible patients included those presenting for a surgical procedure in the main operating room, who were ≤ 21 years of age, with a drug allergy listed on the EMR. Prior to intraoperative care, an electronic survey questionnaire containing questions related to medication allergies was provided to a guardian or parent. Two anesthesiology physicians reviewed the survey responses to determine the validity of any reported allergies. A second electronic survey was given postoperatively to the attending anesthesiologist to determine whether the documented allergy impacted anesthetic care., Results: The study cohort included 250 patients, ranging in age from 5 to 14 years (median age 9 years). All of the patients had at least one allergy listed on the electronic medical record. Seventy of the 250 patients (28%) had more than one drug allergy listed for a total of 351 medication allergies. The majority of the listed allergies were related to antibiotics including 155 (44%) from the penicillin family, 26 (7%) cephalosporins, 16 (5%) sulfonamides, and 36 (10%) other antimicrobial agents. Other commonly listed allergies were 27 (8%) nonsteroidal anti-inflammatory agents and 15 (4%) opioids. The remaining 76 (22%) included a miscellaneous list of other medications. On further review of the allergies, the survey was completed for 301 medications. After physician review, 135 of 301 (45%) responses were considered consistent with IgE reactions "true allergy," 73 (24%) were deemed less relevant to IgE reactions "unlikely true allergy," and 93 (31%) were not related to IgE reactions "not an allergy." Care alterations during surgery were uncommon regardless of whether the issue was assessed as a true allergy (11%), unlikely to be a true allergy (3%), or not a true allergy (13%)., Conclusion: A significant portion of the documented allergies in children are not true allergies, but rather recognized adverse effects (apnea from an opioid, renal failure from an NSAIDs) or other nonallergic concerns (gastrointestinal upset such as nausea). Erroneously listed allergies may lead to unnecessary alterations in patient care during perioperative care. A careful analysis of the allergy list on the EMR should be supplemented by a thorough patient history with specific questions related to the drug allergy. Once this is accomplished, the allergy listed should be updated to avoid its erroneous impact on perioperative care., (© 2024 John Wiley & Sons Ltd.)
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- 2024
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20. Testosterone concentrations and associated predictors in men with cystic fibrosis: A retrospective, single-center study.
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Jathal I, Wang Y, Binongo JNG, Cobb C, Hunt WR, Khan FN, and Tangpricha V
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- Humans, Male, Retrospective Studies, Adult, Young Adult, Middle Aged, Testosterone blood, Cystic Fibrosis blood, Cystic Fibrosis epidemiology, Hypogonadism blood, Hypogonadism epidemiology
- Abstract
Background: Men with cystic fibrosis (CF) have sexual health concerns such as delayed puberty, infertility, and hypogonadism. The causes and prevalence of hypogonadism have not been well studied. The purpose of this study was to determine the prevalence of a low testosterone concentration in men with CF., Methods: This retrospective study was approved by the Emory University Institutional Review Board (IRB). Data were extracted from the electronic medical records of adult men with CF receiving care at the Emory Cystic Fibrosis Center. A total of 129 men with CF were followed at our center from 2016 to 2023. Of these individuals, 76 men with CF (58.9%) had at least one serum total testosterone measurement. Seven individuals were excluded from this study since they were currently receiving testosterone therapy, leaving a final sample size of 69 individuals for the analysis. Demographic data, serum testosterone concentrations, and other factors associated with low testosterone concentrations were collected. Low testosterone was defined as a value below 300 ng/dL. Regression analyses were used to determine factors associated with low testosterone levels., Results: The mean (± SD) age of the 69 eligible participants was 33.34 ± 10.98 years. The mean testosterone concentration was 421 ± 158.5 ng/dL with 27.54 percent of men with a testosterone value below 300 ng/dL. The mean hemoglobin level was 14.23 ± 2.18 g/dL. Testosterone levels were positively related to hemoglobin levels. Time of day of measurement and age were not associated with testosterone levels., Conclusion: Roughly a quarter of men with CF demonstrated low testosterone in our sample. Low hemoglobin was associated with low testosterone levels in men with CF. Neither time of day nor age influenced testosterone concentrations in this sample., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Vin Tangpricha, Yanhua Wang, William R. Hunt reports financial support was provided by Emory University School of Medicine. Vin Tangpricha, Crystal Cobb, William R. Hunt, and Farah Khan reports financial support was provided by Cystic Fibrosis Foundation. Vin Tangpricha reports financial support was provided by National Institutes of Health. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Published by Elsevier Inc.)
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- 2024
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21. Social Media and the Allergist.
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Gupta P, Kazmi W, Penna GD, Bupathi S, and Khan FN
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- Humans, Hypersensitivity therapy, Social Media, Allergists
- Abstract
Purpose of Review: With this brief review, we summarize our findings of how allergists, professional organizations and patients within the allergy space are using social media to date., Recent Findings: Millions of Americans suffer from allergic conditions and it has been well established that there aren't enough allergists to help treat and reach each of these people. With a noticeable absence from social media platforms of board certified allergists with knowledge based in evidence and science, the vacuum has been filled by others - some of whom advocate for the exact things we discourage because they are not helpful, and can even be harmful, for our allergic patients. While there are drawbacks to using social media platforms, as a specialty we need to acknowledge and perhaps even embrace the idea that the use of social media can have a positive effect - as a means to not only introduce, engage and educate our patients and other HCPs, but also to reduce misinformation. Social media is a powerful tool that can be responsibly used by our allergy community to amplify our collective voice to share important health information with our patients and other healthcare professionals and we believe that more training and education needs to be done so that our speciality can join others in becoming a larger voice in the space., (© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
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- 2024
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22. Non-technological barriers: the last frontier towards AI-powered intelligent optical networks.
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Khan FN
- Abstract
Machine learning (ML) has been remarkably successful in transforming numerous scientific and technological fields in recent years including computer vision, natural language processing, speech recognition, bioinformatics, etc. Naturally, it has long been considered as a promising mechanism to fundamentally revolutionize the existing archaic optical networks into next-generation smart and autonomous entities. However, despite its promise and extensive research conducted over the last decade, the ML paradigm has so far not been triumphant in achieving widespread adoption in commercial optical networks. In our perspective, this is primarily due to non-addressal of a number of critical non-technological issues surrounding ML-based solutions' development and use in real-world optical networks. The vision of intelligent and autonomous fiber-optic networks, powered by ML, will always remain a distant dream until these so far neglected factors are openly confronted by all relevant stakeholders and categorically resolved., (© 2024. The Author(s).)
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- 2024
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23. Prioritizing sexual and reproductive health research and care for people with cystic fibrosis: A 2023 workshop report from the Cystic Fibrosis Foundation Sexual Health, Reproduction, and Gender (SHARING) Research Working Group.
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Kazmerski TM, Moy C, Aliaj E, Hudson J, Wright B, Poranski M, Sjoberg J, Taylor-Cousar JL, Georgiopoulos AM, Ladores SL, Trimble A, Tangpricha V, Khan FN, Ramasamy R, Leitner DV, West NE, Santos RD, Stransky OM, Wilson A, Keller A, and Jain R
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- Humans, Female, Male, Biomedical Research, Adult, Cystic Fibrosis therapy, Cystic Fibrosis psychology, Reproductive Health, Sexual Health
- Abstract
Background: To address sexual and reproductive health (SRH) concerns among people with cystic fibrosis(PwCF), the CF Foundation created the Sexual Health, Reproduction, and Gender Research (SHARING) Working Group. This report summarizes CF community SRH research priorities and workshop discussions/future study planning., Methods: Pre-workshop, we distributed a community prioritization survey on CF SRH research/care. During the workshop, we used results and reviewed existing research to establish research priorities and design studies to address identified knowledge gaps., Results: A total of 303 respondents (85 % PwCF, 15 % caregivers) completed the survey. Highly-rated SRH topics were: 1) effects of CF modulator therapy on sex hormones; 2) effects of sex hormones on CF; 3) fertility; 4) pregnancy; and 5) SRH/mental health. Twenty-four workshop participants established the need for further research on sex hormones and CF, optimizing SRH care provision, and fertility/ART., Conclusion: SRH is an important and emerging area in CF and thoughtful consideration of community perspectives can ensure that future research is relevant and responsive., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 European Cystic Fibrosis Society. Published by Elsevier B.V. All rights reserved.)
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- 2024
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24. Trends and advances in pre- and post-harvest processing of linseed oil for quality food and health products.
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Langyan S, Yadava P, Khan FN, Sharma S, Singh R, Bana RS, Singh N, Kaur V, Kalia S, and Kumar A
- Abstract
Linseed is an ancient crop used for diverse purposes since the beginning of civilization. In recent times, linseed has emerged as a superfood due to its high content of health-promoting omega-3 fatty acids and other bioactive compounds. Among primary health effects, it has potential to manage hypertension, diabetes, osteoporosis, atherosclerosis, cancer, arthritis, neurological, cardiovascular diseases including blood cholesterol levels, constipation, diarrhea, and autoimmune disorders etc. due to the presence of omega-3 fatty acid, lignans, high dietary fibers, and proteins, whereas, secondary health effects comprise of relieving from various skin disorders. Due to these health-beneficial properties, interest in linseed oil necessitates the intensification of research efforts on various aspects. These include cultivation technology, varietal and genetic improvement, post-harvest processing, profiling of nutrients and bioactive compounds, pre-clinical and clinical studies, etc. The present review discussed the advances in linseed research including pre- and post-harvest processing. However, focus on the bioactive compounds present in linseed oil and their health effects are also presented. Linseed cultivation, pre- and post-harvest processing aspects are covered including climatic, edaphic, agronomic factors, type of cultivar and storage conditions etc, which impact the overall oil yield and its nutritional quality. Various emerging applications of linseed oil in functional food, nutraceutical, pharmaceutical, and cosmeceutical preparations were also presented in detail. Further, recommendations were made on linseed oil research in the field of genetics, breeding germplasm resources and genome editing for exploring its full applications as a nutrition and health product.
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- 2023
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25. Global emergence of Langya virus: A serious public health concern.
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Piracha ZZ, Saeed U, Ahmed RA, Khan FN, and Nasir MI
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- Humans, Public Health, Global Health, Zika Virus, Zika Virus Infection
- Abstract
Competing Interests: Disclosure of interest: The authors completed the ICMJE Disclosure of Interest Form (available upon request from the corresponding author) and disclose no relevant interests.
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- 2023
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26. Convolutional-neural-network-based versus vision-transformer-based SNR estimation for visible light communication networks.
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Zhao Z, Khan FN, Qasem ZAH, Deng B, Li Q, Liu Z, and Fu HY
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Visible light communication (VLC) has emerged as a promising technology for future sixth-generation (6 G) communications. Estimating and predicting the impairments, such as turbulence and free space signal scattering, can help to construct flexible and adaptive VLC networks. However, the monitoring of impairments of VLC is still in its infancy. In this Letter, we experimentally demonstrate a deep-neural-network-based signal-to-noise ratio (SNR) estimation scheme for VLC networks. A vision transformer (ViT) is first utilized and compared with the conventional scheme based on a convolutional neural network (CNN). Experimental results show that the ViT-based scheme exhibits robust performance in SNR estimation for VLC networks compared to the CNN-based scheme. Specifically, the ViT-based scheme can achieve accuracies of 76%, 63.33%, 45.33%, and 37.67% for 2-quadrature amplitude modulation (2QAM), 4QAM, 8QAM, and 16QAM, respectively, against 65%, 57.67%, 41.67%, and 34.33% for the CNN-based scheme. Additionally, data augmentation has been employed for achieving enhanced SNR estimation accuracies of 95%, 79.67%, 58.33%, and 50.33% for 2QAM, 4QAM, 8QAM, and 16QAM, respectively. The effect of the SNR step size of a contour stellar image dataset on the SNR estimation accuracy is also studied.
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- 2023
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27. Cloning and comparative modeling identifies a highly stress tolerant Cu/Zn cytosolic super oxide dismutase 2 from a drought tolerant maize inbred line.
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Gautam A, Khan FN, Priya S, Kumar K, Sharda S, Kaul T, Singh I, Langyan S, and Yadava P
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- Reactive Oxygen Species metabolism, Superoxide Dismutase-1 genetics, Phylogeny, Seedlings genetics, Superoxide Dismutase genetics, Cloning, Molecular, Oxides metabolism, Zinc metabolism, Zea mays genetics, Droughts
- Abstract
Plants have a complex system of stress response that deals with different types of stresses. Maize ( Zea mays L.), one of the most important crops grown throughout the world, across a range of agro-ecological environments, employs complex mechanisms of gene regulation in response to drought stress. HKI 335 is a tropical maize inbred line showing remarkable adaptation to drought stress. Abiotic stresses, like drought, trigger the production of reactive oxygen species (ROS) due to the incomplete reduction or excitation of molecular oxygen, eventually leading to cell damage. Superoxide dismutase (SOD, EC 1.15.1.1) is a metalloenzyme that acts as the first line of defense against ROS. We cloned the Sod2 gene from HKI 335 inbred line and analyzed its protein through detailed in silico characterization. Our comparative modeling revealed that at the level of tertiary structure, the HKI 335 SOD2 protein is highly similar to Potentilla atrosanguinea SOD2, which had been previously identified as highly thermostable SOD that can tolerate autoclaving as well as sub-zero temperatures. We performed phylogenetic analysis, estimated physicochemical properties, post-translational modifications, protein-protein interactions, and domain composition of this SOD2. The phylogenetic analysis showed that orthologous sequences of SOD from different species were clustered into two clusters. Secondary structure prediction indicates that SOD2 is a soluble protein and no transmembrane domains have been found. Most of the beta sheets have RSA value greater than 2. The Ramachandran plot from PDBsum revealed that most of the residues fall in the highly favored region. It was estimated that the value of the instability index was less than 40, the value of the aliphatic index was extremely high and the GRAVY value lies between -2 and +2. We could identify only one phosphorylation site, located at position 20 with a score of 0.692. Overall, the unique stress-tolerant properties of the HKI 335 SOD2, may be one of the reasons contributing to the high drought tolerance trait exhibited by HKI 335 maize inbred line. Further research may reveal more insights into the drought adaptation mechanism in maize and the eventual deployment of the trait in maize hybrids., Competing Interests: Pranjal Yadava and Sapna Langyan are Academic Editors for PeerJ., (© 2023 Gautam et al.)
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- 2023
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28. Creating and Stabilizing an Oxidized Pd Surface under Reductive Conditions for Photocatalytic Hydrogenation of Aromatic Carbonyls.
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Qiao W, Fan X, Liu W, Khan FN, Zhang D, Han F, Yue H, Li Y, Dimitratos N, Albonetti S, Wen X, Yang Y, Besenbacher F, Li Y, Niemantsverdriet H, Lin H, and Su R
- Abstract
Photocatalysis provides an eco-friendly route for the hydrogenation of aromatic carbonyls to O-free aromatics, which is an important refining process in the chemical industry that is generally carried out under high pressure of hydrogen at elevated temperatures. However, aromatic carbonyls are often only partially hydrogenated to alcohols, which readily desorbs and are hardly further deoxygenated under ambient conditions. Here, we show that by constructing an oxide surface over the Pd cocatalyst supported on graphitic carbon nitride, an alternative hydrogenation path of aromatic carbonyls becomes available via a step-wise acetalization and hydrogenation, thus allowing efficient and selective production of O-free aromatics. The PdO surface allows for optimum adsorption of reactants and intermediates and rapid abstraction of hydrogen from the alcohol donor, favoring fast acetalization of the carbonyls and their consecutive hydrogenation to O-free hydrocarbons. The photocatalytic hydrogenation of benzaldehyde into toluene shows a high selectivity of >90% and a quantum efficiency of ∼10.2% under 410 nm irradiation. By adding trace amounts of HCl to the reaction solution, the PdO surface remains stable and active for long-term operation at high concentrations, offering perspective for practical applications.
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- 2023
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29. Use of convalescent plasma in pregnant women with early stage COVID-19 infection in a tertiary care hospital in Dubai, February to March 2021: a case series study.
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Adan H, Harb D, Hazari K, Abdelkareem W, Khan FN, Zouaoui M, Raouf M, Elsawy D, Azar AJ, Khamis AH, and Ammar A
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- Adult, Female, Hospitals, Maternity, Humans, Patient Discharge, Pregnancy, Retrospective Studies, SARS-CoV-2 immunology, Tertiary Care Centers, Treatment Outcome, United Arab Emirates, COVID-19 Serotherapy, COVID-19 immunology, COVID-19 therapy, COVID-19 virology, Immunization, Passive adverse effects, Pregnancy Complications, Infectious immunology, Pregnancy Complications, Infectious therapy, Pregnancy Complications, Infectious virology
- Abstract
Background: The use of COVID-19 convalescent plasma (CCP) for the treatment of SARS-CoV-2 infection in pregnancy is intriguing in view of its safety profile in pregnancy and historical precedence of the use of plasma for other viral illnesses. This study aimed to evaluate the use of CCP in pregnant women with early COVID-19 infection., Methods: This is a retrospective case series study. We have included seven pregnant women admitted with early COVID-19 infection to a tertiary care hospital, Latifa Maternity Hospital in Dubai, United Arab Emirates between 12 February and 04 March 2021 and who consented to receive COVID-19 convalescent plasma as part of their treatment plan. Main outcomes measured were clinical and radiological features, laboratory tests, WHO clinical progression scale pre and post treatment, and maternal, fetal outcomes. COVID-19 clinical severity was classified according to the NIH guidelines for criteria of SARS-CoV-2. For the radiological features, a modified chest X-ray scoring system was used where each lung was divided into 6 zones (3 on each side upper, middle, and lower). Opacities were classified into reticular, ground glass, patchy and dense consolidations patterns., Results: Seven pregnant women with early COVID-19 were enrolled in this study, their mean age was 28 years (SD 3.6). Four had comorbidities: 2 with diabetes, 1 with asthma, and 1 was obese. Five patients were admitted with a WHO clinical progression score of 4 (hospitalized; with no oxygen therapy) and 2 with a score of 5 (hospitalized; oxygen by mask/nasal prongs). Upon follow up on day 10, 6 patients had a WHO score of 1 or 2 (asymptomatic/mild symptoms) indicating clinical recovery. Adverse reactions were reported in 2 patients, one reported a mild skin rash, and another developed transfusion related circulatory overload. All patients were discharged alive., Conclusion: CCP seems to be a promising modality of treating COVID-19 infected pregnant women. However, further studies are needed to ascertain the efficacy of CCP in preventing progressive disease in the management of COVID-19 infection in pregnant women., (© 2022. The Author(s).)
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- 2022
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30. Forecasting COVID19 parameters using time-series: KSA, USA, Spain, and Brazil comparative case study.
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Larabi-Marie-Sainte S, Alhalawani S, Shaheen S, Almustafa KM, Saba T, Khan FN, and Rehman A
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Many countries are suffering from the COVID19 pandemic. The number of confirmed cases, recovered, and deaths are of concern to the countries having a high number of infected patients. Forecasting these parameters is a crucial way to control the spread of the disease and struggle with the pandemic. This study aimed at forecasting the number of cases and deaths in KSA using time-series and well-known statistical forecasting techniques including Exponential Smoothing and Linear Regression. The study is extended to forecast the number of cases in the main countries such that the US, Spain, and Brazil (having a large number of contamination) to validate the proposed models (Drift, SES, Holt, and ETS). The forecast results were validated using four evaluation measures. The results showed that the proposed ETS (resp. Drift) model is efficient to forecast the number of cases (resp. deaths). The comparison study, using the number of cases in KSA, showed that ETS (with RMSE reaching 18.44) outperforms the state-of-the art studies (with RMSE equal to 107.54). The proposed forecasting model can be used as a benchmark to tackle this pandemic in any country., Competing Interests: The authors declare no conflict of interest., (© 2022 The Author(s).)
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- 2022
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31. Application and comparison of active and transfer learning approaches for modulation format classification in visible light communication systems.
- Author
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Zhao Z, Khan FN, Li Y, Wang Z, Zhang Y, and Fu HY
- Abstract
Automatic modulation classification (AMC) is a crucial part of adaptive modulation schemes for visible light communication (VLC) systems. However, most of the deep learning (DL) based AMC methods for VLC systems require a large amount of labeled training data which is quite difficult to obtain in practical systems. In this work, we introduce active learning (AL) and transfer learning (TL) approaches for AMC in VLC systems and experimentally analyze their performances. Experimental results show that the proposed novel AlexNet-AL and AlexNet-TL methods can significantly improve the classification accuracy with small sizes of training data. To be specific, using 60 labeled samples, AlexNet-AL and AlexNet-TL increase the classification accuracy by 6.82% and 14.6% compared to the result without AL and TL, respectively. Moreover, the use of data augmentation (DA) operation along with our proposed methods helps achieve further better performances.
- Published
- 2022
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32. Environmental impacts of FDI: evidence from heterogeneous panel methods.
- Author
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Arif U, Arif A, and Khan FN
- Subjects
- Cross-Sectional Studies, Environment, Environmental Pollution analysis, Internationality, Investments, Carbon Dioxide analysis, Economic Development
- Abstract
This paper investigates the effect of foreign direct investment (FDI) on environmental quality for 123 nations over the period 1996 to 2018. The study also conducts a comparative analysis for 45 developing and 78 developed nations to better understand the environmental impacts of foreign direct investment. The study employs pooled mean group (PMG) and mean group (MG) estimation techniques for investigating the impacts of FDI on environmental quality as the slope heterogeneity test rejects the null hypothesis of homogenous slope coefficients for the cross-sectional units in all country groupings. In addition, the study employs common correlated effect pooled mean group (CCEPMG) and common correlated effect mean group (CCEMG) estimation methods to tackle cross-sectional dependence in all country groupings. The results indicate that the impact of FDI on environmental emission is negative and significant for the global sample. Furthermore, the comparative analysis for developed and developing countries indicates that FDI improves environmental quality in developed nations as it leads to a lower level of CO
2 emissions whereas it leads to adverse environmental impacts in the developing nations as it leads to a higher level of CO2 emissions. The empirical findings for developed and developing countries confirm pollution haven hypothesis (PHH) for developing countries while pollution halo hypothesis for developed countries. This study may help the policy makers to better understand the attributes of FDI and to devise such type of policies and regulatory framework which encourages environmentally friendly FDI or the FDI that take care of environmental quality., (© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)- Published
- 2022
- Full Text
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33. Sustaining Protein Nutrition Through Plant-Based Foods.
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Langyan S, Yadava P, Khan FN, Dar ZA, Singh R, and Kumar A
- Abstract
Proteins are essential components of the human diet. Dietary proteins could be derived from animals and plants. Animal protein, although higher in demand, is generally considered less environmentally sustainable. Therefore, a gradual transition from animal- to plant-based protein food may be desirable to maintain environmental stability, ethical reasons, food affordability, greater food safety, fulfilling higher consumer demand, and combating of protein-energy malnutrition. Due to these reasons, plant-based proteins are steadily gaining popularity, and this upward trend is expected to continue for the next few decades. Plant proteins are a good source of many essential amino acids, vital macronutrients, and are sufficient to achieve complete protein nutrition. The main goal of this review is to provide an overview of plant-based protein that helps sustain a better life for humans and the nutritional quality of plant proteins. Therefore, the present review comprehensively explores the nutritional quality of the plant proteins, their cost-effective extraction and processing technologies, impacts on nutrition, different food wastes as an alternative source of plant protein, and their environmental impact. Furthermore, it focuses on the emerging technologies for improving plant proteins' bioavailability, digestibility, and organoleptic properties, and highlights the aforementioned technological challenges for future research work., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Langyan, Yadava, Khan, Dar, Singh and Kumar.)
- Published
- 2022
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34. Diabetes and the WHO Model List of Essential Medicines.
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Khan FN and Hirsch IB
- Subjects
- Humans, World Health Organization, Diabetes Mellitus drug therapy, Drugs, Essential
- Abstract
Competing Interests: FNK declares no competing interests. IBH receives research funding from Medtronic Diabetes, Insulet, and Beta Bionics. IBH receives consulting fees from Abbott Diabetes Care, Roche, Bigfoot, and GWave.
- Published
- 2022
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35. Assessing the Effect of Board Gender Diversity on CSR Reporting Through Moderating Role of Political Connections in Chinese Listed Firms.
- Author
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Shaheen R, Yang H, Bhutto MY, Bala H, and Khan FN
- Abstract
This study departs from existing work on board gender diversity (BGD) and corporate social responsibility (CSR) reporting by analyzing and explaining the mechanism by which gender-diverse boards in politically embedded firms (PEFs) affect firms' CSR reporting choices in a unique institutional setting of Chinese listed firms from 2010 to 2018. The following main results are obtained. First, having female directors and executives with political connections (PCs) on corporate boards improves the CSR reporting of firms. Firms with PCs have a greater possibility to issue CSR reports than their non-connected counterparts. Second, firms that have both gender diversity and PCs on their boards of directors are more likely to engage in CSR reporting. There is an indication that the presence of PCs on boards can strengthen the effect of female directors on firms' CSR reporting. Third, the presence of female directors on corporate boards has a stronger relationship with CSR reporting in PEFs than in non-PEFs. The study concludes that both BGD and PCs on corporate boards positively influence the diffusion of CSR-related practices in the Chinese business environment., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Shaheen, Yang, Bhutto, Bala and Khan.)
- Published
- 2021
- Full Text
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36. Financial inclusion and monetary policy effectiveness: A sustainable development approach of developed and under-developed countries.
- Author
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Arshad MU, Ahmed Z, Ramzan A, Shabbir MN, Bashir Z, and Khan FN
- Subjects
- Humans, Inflation, Economic, Models, Economic, Poverty economics, Developing Countries economics, Economic Development, Sustainable Development economics
- Abstract
The study explores the causal relationship between monetary policy effectiveness and financial inclusion in developed and under-developed countries. Structural Vector Auto-regressive techniques have been inducted to explore the relationship between monetary policy effectiveness and financial inclusion. The study covers the secondary data of 10 developed and 30 underdeveloped countries throughout 2004-2018. It is concluded that monetary policy effectiveness and financial inclusion do not have a contemporaneous impact on each other. Nevertheless, the reduced-form Vector Auto-regressive witness the reverse causality between financial inclusion and monetary policy effectiveness in developed countries. Thus, effective monetary policy enhances financial inclusion in a country, and a higher degree of financial inclusion lowers the inflation rate and makes monetary policy effective. One way causality from monetary policy effectiveness to financial inclusion can be observed in under-developed countries. Using the Structural Vector auto-regressive technique and financial inclusion index composed of three-dimension to examine the relationship of monetary policy effectiveness and financial inclusion in developed and developing countries is considered the study's significant contribution., Competing Interests: The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
- Published
- 2021
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37. Men's health in the modern era of cystic fibrosis.
- Author
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Khan FN, Tangpricha V, Hughan KS, Jain R, Ladores SL, Taylor-Cousar JL, West NE, Montemayor K, Sawicki GS, Uluer A, Aitken ML, Shnorhavorian M, Bray LA, Kvam C, Stalvey M, and Kazmerski TM
- Subjects
- Humans, Male, Cystic Fibrosis, Men's Health, Reproductive Health, Sexual Health
- Abstract
Competing Interests: Declaration of Competing Interest No conflicts to disclose.
- Published
- 2021
- Full Text
- View/download PDF
38. In silico proteolysis and analysis of bioactive peptides from sequences of fatty acid desaturase 3 (FAD3) of flaxseed protein.
- Author
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Langyan S, Khan FN, Yadava P, Alhazmi A, Mahmoud SF, Saleh DI, Zuan ATK, and Kumar A
- Abstract
Flaxseed (Linum usitatissimum), commonly known as linseed is an oilseed crop, emerging as an important and functional ingredient of food and has been paid more attention due to its nutritional value as well as beneficial effects. It is mainly rich in is α-linolenic acid (ALA, omega-3 fatty acid), fibres and lignans that have potential health benefits in reducing cardiovascular diseases, diabetes, osteoporosis, atherosclerosis, cancer, arthritis, neurological and autoimmune disorders. Due to its richness in omega-3 fatty acid, a group of enzymes known as fatty acid desaturases (FADs) mainly introduce double bonds into fatty acids' (FAs) hydrocarbon chains that produce unsaturated fatty acids. Fatty acid desaturase 3 (FAD3), the commonest microsomal enzyme of omega-3 fatty acid, synthesizes linolenic acid (C18:3) from linoleic acid located in endoplasmic reticulum (ER) facing towards the cytosol. The emerging field of bioinformatics and large number of databases of bioactive peptides, helps in providing time-saving and efficient method for identification of potential bioactivities of any protein. In this study, 10 unique sequences of FAD3 from flaxseed protein have been used for in silico proteolysis and releasing of various bioactive peptides using three plant proteases, namely ficin, papain and stem bromelain, that are evaluated with the help of BIOPEP database. Overall, 20 biological activities were identified from these proteins. The results showed that FAD3 protein is a potential source of peptides with angiotensin-I-converting enzyme (ACE) inhibitory and dipeptidyl peptidase-IV (DPP-IV) activities, and also various parameters such as ∑A, ∑B, A
E , W, BE , V and DHt were also calculated. Furthermore, PeptideRanker have been used for screening of novel promising bioactive peptides. Various bioinformatics tools also used to study protein's physicochemical properties, peptide's score, toxicity, allergenicity aggregation, water solubility, and drug likeliness. The present work suggests that flaxseed protein can be a good source of bioactive peptides for the synthesis of good quality and quantity of oil, and in silico method helps in investigating and production of functional peptides., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2021 The Author(s).)- Published
- 2021
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39. A cohort study analyzing the impact of socioeconomic and spatial characteristics alongside treatment regimens on the environmental-health outcomes of the MDR-TB treatment in Pakistan.
- Author
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Arif A, Ahmad E, Khan FN, and Fatima R
- Subjects
- Cohort Studies, Humans, Male, Outcome Assessment, Health Care, Pakistan, Socioeconomic Factors, Antitubercular Agents, Tuberculosis, Multidrug-Resistant drug therapy, Tuberculosis, Multidrug-Resistant epidemiology
- Abstract
This study identifies and analyzes a number of factors that correlate with the environmental-health outcome of multi-drug resistance tuberculosis (MDR-TB) treatment in Pakistan. Survival analysis is carried out by applying the multivariable Cox Proportional Hazard model on secondary data of 369 patients registered at three main MDR-TB sites in Pakistan during 2012-2017. Results show that there is no difference in survival of patients between the two treatment arms, hospital and ambulatory care. Male gender and travel expenditure are found to be negatively associated with the environmental-health outcome, whereas spatial characteristic of time expenditure is positively related to it supporting distance bias approach. Medical expenditure is also positively related to the environmental-health outcome. The study concludes that availability of affordable and accessible health services, better environmental conditions, and ambulatory care based on WHO recommendation as well as health education along with social protection schemes should be ensured by the government to improve environmental-health outcome in the resource-scarce setting in Pakistan., (© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.)
- Published
- 2021
- Full Text
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40. Can We Coach Resilience? An Evaluation of Professional Resilience Coaching as a Well-Being Initiative for Surgical Interns.
- Author
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Song Y, Swendiman RA, Shannon AB, Torres-Landa S, Khan FN, Williams NN, Dumon KR, Brooks AD, DeMatteo RP, and Aarons CB
- Subjects
- Female, Health Personnel, Humans, Male, Personal Satisfaction, Burnout, Professional prevention & control, Internship and Residency, Mentoring
- Abstract
Objective: The purpose of this study was to evaluate the use of a professionally trained, resilience coach for surgical interns., Design: Mixed-methods study with pre- and postcoaching quantitative surveys measuring burnout and resilience factors and semistructured interviews., Setting: General, Vascular, Cardiac, Plastic, and Urologic Surgery residencies at a tertiary academic center., Participants: Categorical and preliminary interns (N = 25) participated in a year-long, 8-session resilience coaching program for the academic year 2018 to 2019., Results: Program participants included 17 (68%) men and 8 (32%) women. The precoaching survey administered to interns before the start of the program identified 60% at risk of burnout as measured by the Abbreviated Maslach Burnout Inventory. The mean (standard deviation) Brief Resilience Scale score was 3.8 (0.8), with a trend toward a higher score (greater resilience) among men compared to women (4.1 [0.7] vs 3.4 [1.0], p = 0.10). Following the completion of the coaching program, the mean (standard deviation) Brief Resilience Scale score increased significantly from 3.8 [0.8] to 4.2 [0.7] p = 0.002). There were no changes in other parameters measuring burnout, satisfaction with life, or positive/negative affect. In semistructured interviews (N = 16/25 participants), most interns believed the coaching experience provided useful skills, but expressed concern about the durability of a 1-year intervention. Additionally, leadership-driven wellness at work, including optimizing team dynamics and purpose-driven engagement, were emphasized., Conclusions: About 60% of new interns at our institution were at risk of burnout. The coaching program was viewed positively and was effective in improving resilience. While this intervention was a useful first step, it should be incorporated into a longitudinal wellness program for the duration of surgical training., (Copyright © 2020 Association of Program Directors in Surgery. Published by Elsevier Inc. All rights reserved.)
- Published
- 2020
- Full Text
- View/download PDF
41. Information and communication technology (ICT) and environmental sustainability: a panel data analysis.
- Author
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Khan FN, Sana A, and Arif U
- Subjects
- Carbon Dioxide, Communication, Cross-Sectional Studies, Investments, Data Analysis, Economic Development
- Abstract
This study investigates the impact of information and communication technology (ICT) on carbon dioxide emissions for a panel of 91 countries over the period 1990 to 2017. The study constructs an ICT index through principal component analysis and tests for the presence of cross-sectional dependence (CSD) in the data. The study employs pooled ordinary least squares, fixed-effects model, and system-generalized method of moments estimation techniques with panel-corrected standard errors (PCSE) to tackle the issues of CSD in the data. The findings of the study show that ICT reduces CO
2 emissions for the full sample of countries. However, the comparative study of developed and developing countries depicts that ICT encourages environmental sustainability in developed countries whereas opposite results are found for developing countries. Moreover, presence of the environmental Kuznets curve is confirmed for the full sample as well as for developed and developing countries. It suggests that with higher levels of development of a country, it would be possible to contribute towards environmental sustainability along with ICT diffusion. Therefore, the outcome of this study may be helpful for policymaker and policies may be designed to encourage ICT investments in developing countries, as ICT will take care of environmental sustainability with higher levels of development.- Published
- 2020
- Full Text
- View/download PDF
42. Prevalence, Characteristics, and Outcomes of Incidental IgA Glomerular Deposits in Donor Kidneys.
- Author
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Gaber LW, Khan FN, Graviss EA, Nguyen DT, Moore LW, Truong LD, Barrios RJ, and Suki WN
- Abstract
Introduction: Incidental IgA deposits in donor kidneys have unknown sequelae and may predate clinical kidney disease if primed by adverse immunologic or hemodynamic stimuli or may remain dormant., Methods: The presence of incidental IgA in post-implantation (T
0 ) biopsies from living (LDK) and deceased donor (DDK) kidneys, and its relationship to post-transplant patient and graft outcomes was investigated in an ethnically diverse US population at a large transplant center., Results: Mesangial IgA was present in 20.4% of 802 T0 biopsies; 13.2% and 24.5% of LDK and DDK, respectively. Donors with incidental IgA deposits were more likely to have hypertension and be of Hispanic or Asian origin. Intensity of IgA staining was 1+ (57.3%), 2+ (26.8%), or 3+ (15.8%) of the T0 IgA+ biopsies. Mesangial pathology correlated with higher-intensity IgA staining with less clearance on follow-up (53.8%) versus 79.2% without mesangial pathology. IgA cleared in 91%, 63%, and 40% of follow-up biopsies with 1+, 2+, and 3+ IgA staining, respectively. Early post-transplant rejection and rejection-related graft loss occurred more frequently in IgA+ kidney recipients; however, 5-year kidney function and graft survival were comparable to kidneys without IgA., Conclusion: This first and largest report of incidental IgA in T0 biopsies of LDK and DDK in a US ethnically diverse population demonstrated no adverse association between the presence of IgA in donor kidneys and graft or patient survival. Whether IgA in donor kidneys represents latent IgA nephropathy (IgAN) is uncertain; nevertheless, living donors who demonstrate IgA on T0 biopsy deserve careful follow-up., (© 2020 Published by Elsevier, Inc., on behalf of the International Society of Nephrology.)- Published
- 2020
- Full Text
- View/download PDF
43. Impact of mismatches in HbA 1c vs glucose values on the diagnostic classification of diabetes and prediabetes.
- Author
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Gonzalez A, Deng Y, Lane AN, Benkeser D, Cui X, Staimez LR, Ford CN, Khan FN, Markley Webster SC, Leong A, Wilson PWF, Phillips LS, and Rhee MK
- Subjects
- Adolescent, Adult, Aged, Aged, 80 and over, Blood Glucose metabolism, Cohort Studies, Cross-Sectional Studies, Diabetes Mellitus, Type 2 blood, Diabetes Mellitus, Type 2 classification, Female, Georgia, Glucose Intolerance blood, Glucose Intolerance classification, Glucose Intolerance diagnosis, Glucose Tolerance Test methods, Glucose Tolerance Test standards, Glycated Hemoglobin metabolism, Humans, Male, Middle Aged, Prediabetic State blood, Prediabetic State classification, Predictive Value of Tests, Reproducibility of Results, Young Adult, Blood Glucose analysis, Diabetes Mellitus, Type 2 diagnosis, Glycated Hemoglobin analysis, Prediabetic State diagnosis
- Abstract
Aims: To determine whether HbA
1c mismatches (HbA1c levels that are higher or lower than expected for the average glucose levels in different individuals) could lead to errors if diagnostic classification is based only on HbA1c levels., Methods: In a cross-sectional study, 3106 participants without known diabetes underwent a 75-g oral glucose tolerance test (fasting glucose and 2-h glucose) and a 50-g glucose challenge test (1-h glucose) on separate days. They were classified by oral glucose tolerance test results as having: normal glucose metabolism; prediabetes; or diabetes. Predicted HbA1c was determined from the linear regression modelling the relationship between observed HbA1c and average glucose (mean of fasting glucose and 2-h glucose from the oral glucose tolerance test, and 1-h glucose from the glucose challenge test) within oral glucose tolerance test groups. The haemoglobin glycation index was calculated as [observed - predicted HbA1c ], and divided into low, intermediate and high haemoglobin glycation index mismatch tertiles., Results: Those participants with higher mismatches were more likely to be black, to be men, to be older, and to have higher BMI (all P<0.001). Using oral glucose tolerance test criteria, the distribution of normal glucose metabolism, prediabetes and diabetes was similar across mismatch tertiles; however, using HbA1c criteria, the participants with low mismatches were classified as 97% normal glucose metabolism, 3% prediabetes and 0% diabetes, i.e. mostly normal, while those with high mismatches were classified as 13% normal glucose metabolism, 77% prediabetes and 10% diabetes, i.e. mostly abnormal (P<0.001)., Conclusions: Measuring only HbA1c could lead to under-diagnosis in people with low mismatches and over-diagnosis in those with high mismatches. Additional oral glucose tolerance tests and/or fasting glucose testing to complement HbA1c in diagnostic classification should be performed in most individuals., (Published 2019. This article is a U.S. Government work and is in the public domain in the USA.)- Published
- 2020
- Full Text
- View/download PDF
44. PlantPepDB: A manually curated plant peptide database.
- Author
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Das D, Jaiswal M, Khan FN, Ahamad S, and Kumar S
- Subjects
- Data Management, Peptides chemistry, Plants chemistry, Software, Databases, Protein, Plant Proteins chemistry, Plant Proteins classification
- Abstract
Plants produce an array of peptides as part of their innate defense mechanism against pathogens. The potential use of these peptides for various therapeutic purposes is increasing per diem. In order to excel in this research, the community requires web repositories that provide reliable and accurate information about these phyto-peptides. This work is an attempt to bridge the gaps in plant-based peptide research. PlantPepDB is a manually curated database that consists of 3848 plant-derived peptides among which 2821 are experimentally validated at the protein level, 458 have experimental evidence at the transcript level, 530 are predicted and only 39 peptides are inferred from homology. Incorporation of physicochemical properties and tertiary structure into PlantPepDB will help the users to study the therapeutic potential of a peptide, thus, debuts as a powerful resource for therapeutic research. Different options like Simple, Advanced, PhysicoChem and AA composition search along with browsing utilities are provided in the database for the users to execute dynamic search and retrieve the desired data. Interestingly, many peptides that were considered to possess only a single property were found to exhibit multiple properties after careful curation and merging the duplicate data that was collected from published literature and already available databases. Overall, PlantPepDB is the first database comprising detailed analysis and comprehensive information of phyto-peptides from a broad functional range which will be useful for peptide-based applied research. PlantPepDB is freely available at http://www.nipgr.ac.in/PlantPepDB/.
- Published
- 2020
- Full Text
- View/download PDF
45. Outcomes of kidney transplantation using deceased donors with history of diabetes.
- Author
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Khan FN, Truong LD, Nguyen DT, Graviss EA, Bhatti MI, Frost AE, Osama Gaber A, and Suki WN
- Subjects
- Graft Survival, Humans, Kidney, Tissue Donors, Treatment Outcome, Diabetes Mellitus, Kidney Transplantation
- Abstract
Deceased diabetic kidneys are increasingly utilized in transplantation. The relationship of donor's history of diabetes to clinical and histological outcomes was examined. Forty-nine diabetic deceased donor kidneys (D-DM) were transplanted into 26 normal (R-N/D-DM) and 23 diabetic recipients (R-DM/D-DM) and compared to 211 diabetic recipients of normal kidneys(R-DM/D-N) and 466 normal recipients of normal kidneys (R-N/D-N). Patient survival at 5 years was 89.7% in R-N/D-N, 96.2% in R-N/D-DM, 80.1% in R-DM/D-N, and a 71.6% in R-DM/D-DM (P = .008). Death-censored graft survival at 5 years was 86.3% in R-N/D-N, 87.4% in R-N/D-DM, 93.5% in R-DM/D-N, and 87.5% in R-DM/D-DM (P = .24). Multivariable regression analysis showed that compared to non-diabetic recipients, diabetic recipients had a 2- to 3-fold increased risk of mortality. In this cohort, there was no impact on death-censored graft survival of diabetic donor status. Only 6 of 26 post-perfusion biopsies showed evidence of diabetic nephropathy (
- Published
- 2020
- Full Text
- View/download PDF
46. Low-complexity carrier phase recovery based on principal component analysis for square-QAM modulation formats.
- Author
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Diniz JCM, Fan Q, Ranzini SM, Khan FN, Ros FD, Zibar D, and Lau APT
- Abstract
We propose, numerically analyze and experimentally demonstrate a low-complexity, modulation-order independent, non-data-aided (NDA), feed-forward carrier phase recovery (CPR) algorithm. The proposed algorithm enables synchronous decoding of arbitrary square-quadrature amplitude modulation (QAM) constellations and it is suitable for a realistic hardware implementation based on block-wise parallel processing. The proposed method is based on principal component analysis (PCA) and it outperforms the well-known and widely used blind phase search (BPS) algorithm at low signal-to-noise ratio (SNR) values, showing much lower cycle slip rate (CSR) both numerically and experimentally. For operation at higher SNR values, a hybrid two-stage implementation combining the proposed method and BPS is also proposed and their performance are investigated benchmarking them against the two-stage BPS (2S-BPS). The complexity of the proposed simple and hybrid methods are evaluated against 2S-BPS and computational complexity savings of 92% and 40% are expected for the simple and hybrid methods, respectively.
- Published
- 2019
- Full Text
- View/download PDF
47. Insight into Mechanistic Action of Thymoquinone Induced Melanogenesis in Cultured Melanocytes.
- Author
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Zaidi KU, Khan FN, Ali SA, and Khan KP
- Subjects
- Cell Line, Tumor, Cell Survival drug effects, Humans, Melanocytes cytology, Melanocytes metabolism, Melanoma, Experimental, Monophenol Monooxygenase genetics, Monophenol Monooxygenase metabolism, Protein Kinase Inhibitors pharmacology, Signal Transduction, Tumor Cells, Cultured, Benzoquinones pharmacology, Melanins biosynthesis, Melanocytes drug effects
- Abstract
Background: Melanin plays a crucial role in camouflage, social communication and protection against harmful ultraviolet radiations. Melanin is synthesized by melanocytes through melanogenesis and several intrinsic and extrinsic factors are involved during the process. Any change occuring in the normal melanogenesis process can cause severe pigmentation problems of hypopigmentation or hyperpigmentation., Objective: The present study is based on the evaluation of the effect of thymoquinone on melanogenesis and their possible mechanism of action using the B16F10 melanoma cell line for the production via blocking signaling pathways., Methods: Phase contrast microscopy, cell viability, tyrosinase activity, melanin content and western blot analysis were used in the present study., Results: In the present investigation, cultured melanocytes exhibit that the stimulation of melanin synthesis when treated with thymoquinone. Tyrosinase activity and melanin production in B16F10 melanoma cell line was increased in doze-dependent manner. In western blot, we investigated the involvement of the cAMP/PKA pathway in thymoquinone induced melanogenesis. It was observed protein kinase inhibitors PKA, PKC, PKB and MEK1 decreased the stimulatory effects of thymoquinone from 11.45- fold value to 8.312, 6.631, 4.51, and 7.211-fold value, respectively. However, the results also prove that thymoquinone may partially induce tyrosinase expression via PKA, PKB, PKC and MEK1 signaling pathways., Conclusion: The present finding proposed that thymoquinone is a protective challenger for melanogenesis and it might be useful for the treatment of hypopigmentary disorders., (Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.)
- Published
- 2019
- Full Text
- View/download PDF
48. A review on the antagonist Ebola: A prophylactic approach.
- Author
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Khan FN, Qazi S, Tanveer K, and Raza K
- Subjects
- Animals, Disease Outbreaks, Hemorrhagic Fever, Ebola immunology, Hemorrhagic Fever, Ebola prevention & control, Humans, Vaccines immunology, Antiviral Agents pharmacology, Antiviral Agents therapeutic use, Ebolavirus drug effects, Hemorrhagic Fever, Ebola drug therapy
- Abstract
Ebola virus (EBOV), a member of Filoviridae virus family under the genus Ebolavirus, has emerged as a dangerous and potential threat to human health globally. It causes a severe and deadly hemorrhagic fever in humans and other mammals, called Ebola Virus Disease (EVD). In recent outbreaks of EVD, there has been loss of large numbers of individual's life. Therefore, EBOV has attracted researchers and increased interests in developing new models for virus evolution, and therapies. The EBOV interacts with the immune system of the host which led to understand how the virus functions and effects immune system behaviour. This article presents an exhaustive review on Ebola research which includes EVD illness, symptoms, transmission patterns, patho-physiology conditions, development of antiviral agents and vaccines, resilient health system, dynamics and mathematical model of EBOV, challenges and prospects for future studies., (Copyright © 2017 Elsevier Masson SAS. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF
49. Joint OSNR monitoring and modulation format identification in digital coherent receivers using deep neural networks.
- Author
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Khan FN, Zhong K, Zhou X, Al-Arashi WH, Yu C, Lu C, and Lau APT
- Abstract
We experimentally demonstrate the use of deep neural networks (DNNs) in combination with signals' amplitude histograms (AHs) for simultaneous optical signal-to-noise ratio (OSNR) monitoring and modulation format identification (MFI) in digital coherent receivers. The proposed technique automatically extracts OSNR and modulation format dependent features of AHs, obtained after constant modulus algorithm (CMA) equalization, and exploits them for the joint estimation of these parameters. Experimental results for 112 Gbps polarization-multiplexed (PM) quadrature phase-shift keying (QPSK), 112 Gbps PM 16 quadrature amplitude modulation (16-QAM), and 240 Gbps PM 64-QAM signals demonstrate OSNR monitoring with mean estimation errors of 1.2 dB, 0.4 dB, and 1 dB, respectively. Similarly, the results for MFI show 100% identification accuracy for all three modulation formats. The proposed technique applies deep machine learning algorithms inside standard digital coherent receiver and does not require any additional hardware. Therefore, it is attractive for cost-effective multi-parameter estimation in next-generation elastic optical networks (EONs).
- Published
- 2017
- Full Text
- View/download PDF
50. Temperature extraction in Brillouin optical time-domain analysis sensors using principal component analysis based pattern recognition.
- Author
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Azad AK, Khan FN, Alarashi WH, Guo N, Lau APT, and Lu C
- Abstract
We propose and experimentally demonstrate the use of principal component analysis (PCA) based pattern recognition to extract temperature distribution from the measured Brillouin gain spectra (BGSs) along the fiber under test (FUT) obtained by Brillouin optical time domain analysis (BOTDA) system. The proposed scheme employs a reference database consisting of relevant ideal BGSs with known temperature attributes. PCA is then applied to the BGSs in the reference database as well as to the measured BGSs so as to reduce their size by extracting their most significant features. Now, for each feature vector of the measured BGS, we determine its best match in the reference database comprised of numerous reduced-size feature vectors of the ideal BGSs. The known temperature attribute corresponding to the best-matched BGS in the reference database is then taken as the extracted temperature of the measured BGS. We analyzed the performance of PCA-based pattern recognition algorithm in detail and compared it with that of curve fitting method. The experimental results validate that the proposed technique can provide better accuracy, faster processing speed and larger noise tolerance for the measured BGSs. Therefore, the proposed PCA-based pattern recognition algorithm can be considered as an attractive method for extracting temperature distributions along the fiber in BOTDA sensors.
- Published
- 2017
- Full Text
- View/download PDF
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