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Marabi MH, Mozaffari HR, Ghasemi H, Hatami M, Yari K. Evaluation of the association between TNF-α-1031 T/C polymorphism with oral lichen planus disease. BMC Oral Health 2024; 24:189. [PMID: 38317095 PMCID: PMC10845614 DOI: 10.1186/s12903-024-03939-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 01/25/2024] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND Oral lichen planus (OLP) is a T-cell-mediated autoimmune disease that affects the epithelial cells of the oral cavity. This study was performed to investigate any possible relationship between - 1031(T/C) polymorphism (rs1799964) of the tumor necrosis factor α (TNF-α) gene with the risk and severity of oral lichen planus (OLP) disease among an Iranian population. METHOD Saliva samples were collected from 100 patients with OLP and a similar number of healthy controls (age and sex-matched). Then, DNA was extracted from the collected samples for genotyping TNF-α-1031 T/C polymorphism using the PCR-CTPP method. The results were assessed using SPSS software. RESULTS The findings revealed a significantly higher prevalence of the C allele in OLP patients (53%) compared to healthy controls (36%), suggesting an association between TNF-alpha gene polymorphism and OLP. A multivariate logistic regression analysis supported this finding, as the presence of the C allele was significantly associated with an increased risk of OLP [χ2 = 4.17, p = 0.04, 95% CI = 1.01-2.65, OR = 1.64]. However, our data indicated no significant association between TNF-alpha-1031 T/C gene polymorphism and OLP severity. CONCLUSIONS These findings provide the first evidence supporting a possible role of TNF-α-1031 T/C gene polymorphism in OLP susceptibility in the Iranian population. The findings of this study demonstrate a positive association between TNF-α-1031 C/T allele distribution and the risk of OLP disease in the Iranian population. Therefore, carrying the C allele may increase the susceptibility to OLP disease.
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Affiliation(s)
- Mohammad Hesam Marabi
- Student Research Committee, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Hamid Reza Mozaffari
- Department of Oral and Maxillofacial Medicine, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Haniyeh Ghasemi
- Student Research Committee, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Masoud Hatami
- Department of Oral and Maxillofacial Medicine, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Kheirollah Yari
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
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Ghasemi H, Mozaffari HR, Kohsari M, Hatami M, Yari K, Marabi MH. Association of interleukin-8 polymorphism (+ 781 C/T) with the risk of oral Lichen Planus disease. BMC Oral Health 2023; 23:404. [PMID: 37340381 DOI: 10.1186/s12903-023-03088-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 05/30/2023] [Indexed: 06/22/2023] Open
Abstract
BACKGROUND Oral Lichen Planus (OLP) is a chronic inflammatory mucosal disease. The pathogenesis of OLP is unknown. The Single Nucleotide Polymorphism (SNP) that occurs in the regulatory position + 781 could affect the expression of interleukin-8. This polymorphism is probably associated with increased serum levels of IL-8. The current study aimed to investigate the genotype and allele frequencies of IL-8( + 781 C/T) in OLP patients and whether it is associated with the severity of OLP disease in an Iranian population. METHODS Three milliliters of saliva were taken from 100 patients with OLP and 100 healthy individuals who were matched in age and gender. After DNA extraction from saliva samples of patients and healthy individuals, the genotype of IL-8 at position + 781 is detected using the PCR-RFLP method. The results were analyzed using SPSS software. RESULTS Frequency of C/C, T/C, and T/T genotypes at position IL-8 + 781 gene in the patient group were 47%, 41%, and 12%, respectively, and in the control group, were 37%, 42%, and 21%. The difference between the two groups regarding allele frequency distribution was statistically significant (χ2 = 3.86, p = 0.049, 95% CI = 0.44-1, OR = 0.66). Our results indicated the significantly higher frequency of the TT genotype in the erosive OLP compared to the nonerosive group (p = 0.03, OR = 0.89, 95% CI = 0.49-1.6). CONCLUSION This study depicted the difference in the frequency of SNP IL-8 + 781 C/T allele in the patient and control groups had a significant association with the risk of OLP. In addition, our data revealed that IL-8 + 781 C/T polymorphisms might be associated with the severity of OLP in the Iranian population.
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Affiliation(s)
- Haniyeh Ghasemi
- Student Research Committee, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Hamid Reza Mozaffari
- Department of Oral and Maxillofacial Medicine, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Maryam Kohsari
- Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Masoud Hatami
- Department of Oral and Maxillofacial Medicine, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Kheirollah Yari
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
| | - Mohammad Hesam Marabi
- Student Research Committee, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
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Askarnia-Faal MM, Sayyed-Hosseinian SH, Nazari SE, Asgharzadeh F, Vahedi E, Eskandari M, Ghasemi H, Avan A, Alaei M, Naimi H, Daghiani M, Soleimani A, Alalikhan A, Mohammadzadeh R, Ferns G, Ryzhikov M, Khazaei M, Hassanian SM. Exploring new therapeutic potentials of curcumin against post-surgical adhesion bands. BMC Complement Med Ther 2023; 23:27. [PMID: 36721147 PMCID: PMC9887929 DOI: 10.1186/s12906-022-03808-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 11/23/2022] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Adhesion band formation is a common cause of morbidity for patients undergoing surgeries. Anti-inflammatory and anti-fibrotic properties of curcumin, a pharmacologically active component of Curcuma longa, have been investigated in several studies. The aim of this study is to explore the therapeutic potential of curcumin in attenuating post-operative adhesion band (PSAB) formation in both peritoneal and peritendinous surgeries in animal models. METHODS Bio-mechanical, histological and quantitative evaluation of inflammation, and total fibrosis scores were graded and measured in the presence and absence of phytosomal curcumin. RESULTS Results showed that phytosomal curcumin significantly decreased severity, length, density and tolerance of mobility of peritendinous adhesions as well as incidence and severity of abdominal fibrotic bands post-surgery. Curcumin may decrease inflammation by attenuating recruitment of inflammatory cells and regulating oxidant/anti-oxidant balance in post-operative tissue samples. Moreover, markedly lower fibrosis scores were obtained in the adhesive tissues of phytosomal curcumin-treated groups which correlated with a significant decrease in quantity, quality and grading of fibers, and collagen deposition in animal models. CONCLUSION These results suggest that protective effects of phytosomal curcumin against PSAB formation is partially mediated by decreasing inflammation and fibrosis at site of surgery. Further studies are needed to investigate the therapeutic potential of this molecule in preventing PSAB.
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Affiliation(s)
- Mohammad-Mostafa Askarnia-Faal
- grid.411583.a0000 0001 2198 6209Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Sayyed-Hadi Sayyed-Hosseinian
- grid.411583.a0000 0001 2198 6209Orthopedic Research Center, Shahid Kamyab Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyedeh Elnaz Nazari
- grid.411583.a0000 0001 2198 6209Department of Medical Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Fereshteh Asgharzadeh
- grid.411583.a0000 0001 2198 6209Department of Medical Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ehsan Vahedi
- grid.411583.a0000 0001 2198 6209Orthopedic Research Center, Shahid Kamyab Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Moein Eskandari
- grid.411583.a0000 0001 2198 6209Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Haniyeh Ghasemi
- grid.411583.a0000 0001 2198 6209Department of Medical Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Avan
- grid.411583.a0000 0001 2198 6209Metabolic syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran ,grid.411583.a0000 0001 2198 6209Department of Human Genetics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Alaei
- grid.411583.a0000 0001 2198 6209Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hamideh Naimi
- grid.411583.a0000 0001 2198 6209Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Daghiani
- grid.411583.a0000 0001 2198 6209Department of Physiotherapy, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Atena Soleimani
- grid.411583.a0000 0001 2198 6209Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Abbas Alalikhan
- grid.411583.a0000 0001 2198 6209Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Reza Mohammadzadeh
- grid.449862.50000 0004 0518 4224Department of Biology, Faculty of Basic Sciences, University of Maragheh, Maragheh, Iran
| | - Gordon Ferns
- grid.414601.60000 0000 8853 076XDivision of Medical Education, Brighton & Sussex Medical School, Falmer, Brighton, Sussex BN1 9PH UK
| | - Mikhail Ryzhikov
- grid.262962.b0000 0004 1936 9342Saint Louis University, School of Medicine, Saint Louis, MO USA
| | - Majid Khazaei
- grid.411583.a0000 0001 2198 6209Department of Medical Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran ,grid.411583.a0000 0001 2198 6209Metabolic syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyed Mahdi Hassanian
- grid.411583.a0000 0001 2198 6209Department of Clinical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran ,grid.411583.a0000 0001 2198 6209Metabolic syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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Salari N, Vepa A, Daneshkhah A, Darvishi N, Ghasemi H, Khunti K, Mohammadi M. Efficacy of COVID-19 vaccines by race and ethnicity. Public Health 2022; 208:14-17. [PMID: 35660280 PMCID: PMC9069229 DOI: 10.1016/j.puhe.2022.04.009] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 04/21/2022] [Accepted: 04/27/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVES Vaccine uptake amongst ethnic minority populations has been persistently lower, which may be because of socio-economic factors such as health literacy and health insurance status. This review aimed to assess to what extent COVID-19 clinical trials have considered the impact of race and ethnicity on COVID-19 vaccine safety and efficacy. STUDY DESIGN This was a systematic review. METHODS Data regarding ethnicity in COVID-19 vaccine clinical trials were systematically reviewed according to Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines in this systematic review, which ran from inception until June 2021. Three international databases, PubMed, Scopus and Web of Science, were used to conduct systematic article searches. Only two studies reported vaccine efficacy among ethnic minority groups. RESULTS The efficacy of the mRNA-1273 vaccine was confirmed to be 95% in Caucasians and 97.5% in 'people of colour' in a study by Baden et al. In another study by Polack et al., BNT162b2 mRNA vaccine efficacy was reported to be 95.2% in Caucasians, 100% in Afro-Caribbean or African Americans, 94.2% in Hispanic or Latinx and 95.4% in non-Hispanic, non-Latinx people. CONCLUSIONS Given the highly differing effect of COVID-19 on the Afro-Caribbean, Hispanic and South Asian populations, it is imperative for COVID-19 vaccine clinical trials to thoroughly assess the safety and efficacy of vaccines in different ethnicities and, if necessary, develop ethnicity-specific protocols, which can minimise the disproportionate effect of COVID-19 on ethnic minority populations.
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Affiliation(s)
- N Salari
- Department of Biostatistics, School of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran.
| | - A Vepa
- Northwick Park Hospital, London North West University Healthcare NHS Trust, London UK.
| | - A Daneshkhah
- Research Centre for Computational Science and Mathematical Modelling, Coventry University, Coventry CV1 5FB, UK.
| | - N Darvishi
- Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran.
| | - H Ghasemi
- Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran.
| | - K Khunti
- Leicester Diabetes Centre, University of Leicester, UK.
| | - M Mohammadi
- Cellular and Molecular Research Center, Gerash University of Medical Sciences, Gerash, Iran.
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Alipoor B, Nikouei S, Rezaeinejad F, Malakooti-Dehkordi SN, Sabati Z, Ghasemi H. Long non-coding RNAs in metabolic disorders: pathogenetic relevance and potential biomarkers and therapeutic targets. J Endocrinol Invest 2021; 44:2015-2041. [PMID: 33792864 DOI: 10.1007/s40618-021-01559-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 03/22/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND It has been suggested that dysregulation of long non-coding RNAs (lncRNAs) could be associated with the incidence and development of metabolic disorders. AIM Accordingly, this narrative review described the molecular mechanisms of lncRNAs in the development of metabolic diseases including insulin resistance, diabetes, obesity, non-alcoholic fatty liver disease (NAFLD), cirrhosis, and coronary artery diseases (CAD). Furthermore, we investigated the up-to-date findings on the association of deregulated lncRNAs in the metabolic disorders, and potential use of lncRNAs as biomarkers and therapeutic targets. CONCLUSION LncRNAs/miRNA/regulatory proteins axis plays a crucial role in progression of metabolic disorders and may be used in development of therapeutic and diagnostic approaches.
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Affiliation(s)
- B Alipoor
- Department of Laboratory Sciences, Faculty of Paramedicine, Yasuj University of Medical Sciences, Yasuj, Iran
| | - S Nikouei
- Student Research Committee, Yasuj University of Medical Sciences, Yasuj, Iran
| | - F Rezaeinejad
- Department of Biochemistry, Faculty of Medicine, Yasuj University of Medical Sciences, Yasuj, Iran
| | | | - Z Sabati
- MSc student of Hematology, Student Research Committee, School of Allied Medical Sciences, Iran University of Medical Sciences, Tehran, Iran
| | - H Ghasemi
- Abadan Faculty of Medical Sciences, Abadan, Iran.
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Mirakhor Samani S, Ghasemi H, Rezaei Bookani K, Shokouhi B. SERUM NESFATIN-1 LEVEL IN HEALTHY SUBJECTS WITH WEIGHT-RELATED ABNORMALITIES AND NEWLY DIAGNOSED PATIENTS WITH TYPE 2 DIABETES MELLITUS; A CASE-CONTROL STUDY. Acta Endocrinol (Buchar) 2019; -5:69-73. [PMID: 31149062 DOI: 10.4183/aeb.2019.69] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Context Nesfatin-1 is a novel peptide with both central and peripheral anorexigenic regulatory properties. Besides its effects on food intake, few studies have suggested a possible role for this peptide in the pathogenesis of diabetes mellitus type 2. Objective To compare serum levels of nesfatin-1 between healthy, normal-weight persons and three groups including healthy underweight, healthy obese and diabetic subjects. Design Prospective, case-control study, performed between January 2015 and January 2016. Subjects and Methods Fasting levels in serum nesfatin-1 were measured in 30 healthy, normal-weight individuals (controls), 30 healthy underweight persons, 30 healthy obese persons, and 30 patients with newly diagnosed diabetes type 2 using standard enzyme-linked immunosorbent assay (ELISA) kits. Results The mean serum nesfatin-1 level was significantly higher in controls (2.61 ng/mL) compared to that in obese (1.13 ng/mL) and diabetic (0.99 ng/mL) patients; and significantly lower than that in the underweight group (3.50 ng/mL). The obese and diabetic groups were comparable in this regard. No significant association was found between serum nesfatin-1 level and age, sex, or body mass index. Conclusions Serum nesfatin-1 is possibly associated with weight-related abnormalities in otherwise healthy subjects and diabetes type 2. Obesity and diabetes type 2 may share a common pathologic point in this regard.
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Affiliation(s)
- S Mirakhor Samani
- Qazvin University of Medical Sciences, Department of Pathology, Qazvin, Tabriz University of Medical Sciences, Tabriz, Iran
| | - H Ghasemi
- Department of Internal Medicine, Tabriz, Iran
| | | | - B Shokouhi
- Urmia University of Medical Sciences, Department of Internal Medicine, Urmia, Iran
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Soltani A, Ghasemi H. Semi-Markov and reward fields. Stat Probab Lett 2014. [DOI: 10.1016/j.spl.2014.08.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Mirzadeh A, Ghasemi H, Bates PJ, Kamal MR. The Effect of Molecular Parameters on the Thermal Behavior of Recycled and Virgin Polyamides and Their Glass Fiber Composites. INT POLYM PROC 2014. [DOI: 10.3139/217.2775] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
A study was carried out to evaluate the effects of molecular weight and molecular structure on non-isothermal crystallization behavior of recycled and virgin polyamides (PA) and their corresponding glass fiber (GF) composites. Two different recycled polyamides (PA), namely post-industrial waste (PIW) and post-consumer waste (PCW) were used. The former was obtained from a fiber manufacturer and the latter was recycled from used carpets. The molecular weights of the resins were measured by intrinsic viscosity (IV) measurements and 13carbon nuclear magnetic resonance (13C-NMR). The NMR technique also provided information on PA structure, cis and trans amide conformers content and residual unreacted monomer. Non-isothermal crystallization of the resins was studied using differential scanning calorimetry (DSC). The molecular weights of recycled materials were higher than that of virgin injection molding grade PA-6. However, the crystallization rates (indicated by t1/2) of recycled resins were faster. It could be attributed to the presence of TiO2 in recycled materials. Moreover, the higher cis-amide conformer content of recycled resins suggested higher segmental mobility. On the other hand, the crystallization rate of composites based on recycled PA-6 was slower than that of composites based on the virgin PA-6. The suppression of crystallization rate was apparently due to PA-66 added during the preparation of reinforced recycled resins. This behavior was confirmed by model compounds based on PA-6/PA-66 blends.
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Affiliation(s)
- A. Mirzadeh
- Chemical Engineering Department , McGill University, Montreal, QC , Canada
| | - H. Ghasemi
- Chemistry and Chemical Engineering , Royal Military College, Kingston, ON , Canada
| | - P. J. Bates
- Chemistry and Chemical Engineering , Royal Military College, Kingston, ON , Canada
| | - M. R. Kamal
- Chemical Engineering Department , McGill University, Montreal, QC , Canada
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Abstract
Abstract
Polyethylene terephthalate (PET) nanocomposite films (with 3 wt.% Cloisite 30B) were prepared by cast extrusion followed by uniaxial stretching, using chill rolls. Two screw profiles with different mixing elements under different screw speeds (N) and feeding rates (Q) were used to prepare PET/clay nanocomposite (PCN) films. Transmission electron microscopy (TEM) and wide angle X-ray diffraction (WAXD) showed that the clay layers were aligned in the machine direction (MD). XRD patterns depicted that the interlayer distance of clay platelets in the state of intercalation is somehow independent of the processing conditions, but the macro-scale characterization, including barrier and mechanical properties, showed that the level of clay layer delamination was affected by processing conditions. The results reveal that the applied strain has stronger effect than residence time on the barrier and mechanical properties. At the highest screw speed (N = 250 min−1), 27% reduction in oxygen permeability and 30% improvement in tensile modulus were obtained for the more severe screw profile.
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Affiliation(s)
- H. Ghasemi
- CREPEC, Chemical Engineering Department, Ecole Polytechnique, Montreal, Quebec, Canada
| | - P. J. Carreau
- CREPEC, Chemical Engineering Department, Ecole Polytechnique, Montreal, Quebec, Canada
| | - M. R. Kamal
- CREPEC, Department of Chemical Engineering, McGill University, Montreal, Quebec, Canada
| | - N. Chapleau
- CREPEC, Industrial Materials Institute, National Research Council Canada, Boucherville, Quebec, Canada
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Tabatabaei SH, Ajji A, Ghasemi H. Effect of Random and Block Copolypropylenes on Structure and Properties of Uniaxially and Biaxially Oriented PP Films. INT POLYM PROC 2013. [DOI: 10.3139/217.2404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Cast films of two linear polypropylenes (PP) having different molecular weights and their blends with 5, 20, and 40 wt.% random and block copolymers were prepared. The produced cast films were uniaxially and biaxially hot drawn at T = 155°C using a biaxial stretcher and the changes in structure and morphology were examined and related to barrier, mechanical, haze, and tear properties. The crystallinity and crystal size distribution of the films were studied using differential scanning calorimetry (DSC). The uniaxial drawing generated a highly oriented fibrillar structure, resulting in an increase in the melting point of the films. A significant effect of the random copolymer on the size of crystallites was found using DSC, which was also confirmed from polarized optical microscopy (POM). Compared to the neat homopolymers, finer and numerous spherulites were observed for the blends. During drawing, the applied loads in the machine and transverse directions (MD and TD, respectively) were recorded and related to breaking up and tilting of the crystal lamellae. Adding the random copolymer appreciably decreased the haze of the films and hence drastically improved the clarity. Tensile properties and tear resistance of the cast films in MD and TD were evaluated. The addition of the random copolymer slightly reduced the Young modulus and tensile strength, but increased the elongation at break. A slight increase in the oxygen transmission rate (OTR) of the biaxially drawn films were observed by adding the copolymer.
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Affiliation(s)
- S. H. Tabatabaei
- CREPEC, Chemical Engineering Department, Ecole Polytechnique, Montreal, QC, Canada
| | - A. Ajji
- CREPEC, Chemical Engineering Department, Ecole Polytechnique, Montreal, QC, Canada
| | - H. Ghasemi
- CREPEC, Chemical Engineering Department, Ecole Polytechnique, Montreal, QC, Canada
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Affiliation(s)
- H. Ghasemi
- University of Sistan and Baluchestan, Iran
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Satoh M, Terata S, Kikuya M, Ohkubo T, Hashimoto T, Hara A, Hirose T, Obara T, Metoki H, Inoue R, Asayama K, Nakayama M, Kanno A, Totsune K, Hoshi H, Satoh H, Sato H, Imai Y, Palmer S, Germaine W, Iff S, Craig J, Mitchell P, Wang JJ, Strippoli G, Palmer S, Craig J, Navaneethan S, Tonelli M, Pellegrini F, Strippoli G, Stracke S, Ernst F, Robinson D, Schwahn C, John U, Felix SB, Volzke H, Mysula I, Gozhenko A, Susla O, Minutolo R, Gabbai FB, Agarwal R, Bellizzi V, Nappi F, Conte G, De Nicola L, Smith E, Tomlinson L, Ford M, Mcmahon L, Rajkumar C, Holt S, Lee S, Kim I, Lee D, Rhee H, Song S, Seong E, Kwak I, Redal-Baigorri B, Rasmusen K, Goya Heaf J, Sombolos K, Tsakiris D, John B, Vlahakos D, Siamopoulos K, Vargiemezis V, Nikolaidis P, Iatrou C, Dafnis E, Argyropoulos C, Xynos K, Ramona H, Jos D, Guido F, Patrick D, Dominique L, Begona MYK, Antoon DS, Marc VS, Hellberg M, Wiberg EM, Hoglund P, Simonsen O, Clyne N, Manfredini F, Manfredini F, Bolignano D, Rastelli S, Barilla A, Bertoli S, Ciurlino D, Messa P, Fabrizi F, Zuccala A, Rapana R, Fatuzzo P, Rapisarda F, Bonanno G, Lombardi L, De Paola L, Cupisti A, Fuiano G, Lucisano G, Tripepi G, Catizone L, Zoccali C, Mallamaci F, Ishigami T, Ishigami T, Yamamoto R, Nagasawa Y, Isaka Y, Konta T, Iseki K, Moriyama T, Yamagata K, Tsuruya K, Yoshida H, Fujimoto S, Asahi K, Watanabe T, Morales E, Gutierrez E, Forteza A, Bellot R, Sanchez V, Sanz MP, Evangelista A, Cortina J, Praga M, Hung CC, Yang ML, Hwang SJ, Chen HC, Saglimbene VM, Palmer S, Craig J, Pellegrini F, Vecchio M, Ruospo M, De Berardis G, Strippoli G, DI Iorio B, Bellasi A, Pota A, Russo L, Russo D, Nakano C, Nakano C, Hamano T, Fujii N, Obi Y, Matsui I, Mikami S, Inoue K, Shimomura A, Rakugi H, Isaka Y, Yen CY, Wang HH, Hung CC, Hwang SJ, Chen HC, Postorino M, Postorino M, Cutrupi S, Pizzini P, Marino C, D'arrigo G, Tripepi G, Zoccali C, Ghasemi H, Afshar R, Afshar R, Shabpirai H, Davati A, Zerafatjou N, Abdi S, Khorsand Askari M, Almeida E, Lavinas C, Teixeira C, Raimundo M, Nogueira C, Ferreira M, Sampaio A, Henriques I, Teixeira C, Gomes Da Costa A, Leal M, Ekart R, Hojs N, Pecovnik Balon B, Bevc S, Dvorsak B, Stropnik Galuf T, Hojs R, Lin WH, Guo CY, Wang WM, Yang DC, Kuo TH, Liu MF, Wang MC, Hara S, Tanaka K, Tsuji H, Ohmoto Y, Amaka K, Ubara Y, Arase K, Yilmaz MI, Solak Y, Saglam M, Yaman H, Unal HU, Gok M, Cetinkaya H, Biyik Z, Gaipov A, Caglar K, Tonbul HZ, Turk S, Wang HH, Yen CY, Hung CC, Hwang SJ, Chen HC, Krivoshiev S, Krivoshiev S, Koteva A, Kraev Z, Mihaylov G, Shikov P, David R, Jeffrey J, Andrew S, Michael R, Charmot D, Fouda R, Abdelhamid Y, Alsayed D, Salah S, Belal D, Salem M, Ahmed H, Vecchio M, Palmer S, Saglimbene VM, Ruospo M, Gargano L, Pellegrini F, Strippoli G, Tisljar M, Horvatic I, Bozic B, Crnjakovic Palmovic J, Bacalja J, Bulimbasic S, Galesic Ljubanovic D, Galesic K, Choi JS, Kim CS, Park JW, Bae EH, MA SK, Kim SW, Choi JS, Kim CS, Park JW, Bae EH, MA SK, Kim SW. Clinical Nephrology - Epidemiology I. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Etemadian M, Maghsoudi R, Shadpour P, Ghasemi H, Radfar M. UP-03.107 Number of Tracts or Stone Size? Which One Influences Outcome of PCNL for Staghorn Renal Stone? Urology 2011. [DOI: 10.1016/j.urology.2011.07.1197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Maghsoudi R, Etemadian M, Shadpour P, Ghasemi H. UP-03.087 Outcomes of Percutaneous Nephrolithotomy (PCNL) in Patients with Chronic Renal Insufficiency. Urology 2011. [DOI: 10.1016/j.urology.2011.07.1177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ghasemi H, Ward CA. Comment on “Discussion on a mechanical equilibrium condition of a sessile drop on a smooth solid surface” [J. Chem. Phys. 130, 144106 (2009)]. J Chem Phys 2011; 134:247101. [DOI: 10.1063/1.3605662] [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: 11/14/2022] Open
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Rasouli S, Ghasemi H, Tavassoly MT, Khalesifard HR. Application of "parallel" moiré deflectometry and the single beam Z-scan technique in the measurement of the nonlinear refractive index. Appl Opt 2011; 50:2356-2360. [PMID: 21629313 DOI: 10.1364/ao.50.002356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this paper, the application of "parallel" moiré deflectometry in measuring the nonlinear refractive index of materials is reported. In "parallel" moiré deflectometry the grating vectors are parallel, and the resulting moiré fringes are also parallel to the grating lines. Compared to "rotational" moiré deflectometry and the Z-scan technique, which cannot easily determine the moiré fringe's angle of rotation and is sensitive to power fluctuations, respectively, "parallel" moiré deflectometry is more reliable, which allows one to measure the radius of curvature of the light beam by measuring the moiré fringe spacing. The nonlinear refractive index of the sample, including the sense of the change, is obtained from the moiré fringe spacing curve. The method is applied for measuring the nonlinear refractive index of ferrofluids.
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Affiliation(s)
- Saifollah Rasouli
- Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran.
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Ghasemi H, Ward CA. Energy transport by thermocapillary convection during Sessile-Water-droplet evaporation. Phys Rev Lett 2010; 105:136102. [PMID: 21230790 DOI: 10.1103/physrevlett.105.136102] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Indexed: 05/30/2023]
Abstract
The energy transport mechanisms of a sessile-water droplet evaporating steadily while maintained on a Cu substrate are compared. Buoyancy-driven convection is eliminated, but thermal conduction and thermocapillary convection are active. The dominant mode varies along the interface. Although neglected in previous studies, near the three-phase line, thermocapillary convection is by far the larger mode of energy transport, and this is the region where most of the droplet evaporation occurs.
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Affiliation(s)
- H Ghasemi
- Department of Mechanical and Industrial Engineering, Thermodynamics and Kinetics Laboratory, University of Toronto, Toronto, Canada
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Abstract
A method has been recently proposed for determining the value of the surface tension of a solid in the absence of adsorption, gammaS0, using material properties determined from vapor adsorption experiments. If valid, the value obtained for gammaS0 must be independent of the vapor used. We apply the proposed method to determine the value of gammaS0 for four solids using at least two vapors for each solid and find results that support the proposed method for determining gammaS0.
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Affiliation(s)
- H Ghasemi
- Department of Mechanical and Industrial Engineering, Thermodynamics and Kinetics Laboratory, 5 King's College Road, Toronto, Canada M5S 3G8
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Ghasemi H, Murtomaa H, Torabzadeh H, Vehkalahti MM. Restorative treatment threshold reported by Iranian dentists. Community Dent Health 2008; 25:185-190. [PMID: 18839727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
OBJECTIVE To study Iranian dentists' conceptions of the earliest stage to place a restoration on proximal caries lesions. BASIC RESEARCH DESIGN A questionnaire survey was carried out among the participants of two annual dental meetings in Tehran, Iran, in December 2004 and July 2005. The questionnaire was filled in anonymously and returned during the meeting days. The questions covered two patient paper cases with schematic drawings of the radiolucency of proximal caries lesions according to bitewing radiographs from 20-year-old patients: one high-caries case and one low-caries case. Dentists' gender, age, working experience and place, and participation in continuing education served as background data. In total, 1,033 dentists completed the questionnaire, 63% were men. Statistical evaluation was by the Chi square test and logistic regression. MAIN OUTCOME MEASURES Respondents were to select from four alternatives the earliest stage in the progression of a lesion at which they would intervene by restorative treatment. RESULTS For the high-caries case, 77% of the respondents chose to restore a caries lesion confined to enamel; activity in continuing education was the strongest factor (OR = 1.4) to explain dentists' restoring a lesion no earlier than in dentine. For the low-caries case, 32% chose to restore a lesion in enamel. Restoring a lesion no earlier than in dentine was more likely (OR = 1.5) among female dentists. CONCLUSION Iranian dentists seem to prefer early restorative intervention, which indicates a need to focus on the preventive aspects of caries treatment both in dental curricula and in continuing education.
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Affiliation(s)
- H Ghasemi
- Department of Oral Public Health, Institute of Dentistry, University of Helsinki, P.O. Box 41, FI 00014, Helsinki, Finland.
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Motazedian H, Ghasemi H, Sadjjadi SM. Genomic diversity of Blastocystis hominis from patients in southern Iran. Ann Trop Med Parasitol 2008; 102:85-8. [PMID: 18186983 DOI: 10.1179/136485908x252197] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- H Motazedian
- Department of Parasitology and Mycology, School of Medicine, Shiraz University of Medical Sciences, P.O. Box 71345-1735, Shiraz, Iran.
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Hosseini MJ, Ranjbar R, Ghasemi H, Jalalian HR. The prevalence and antibiotic resistance of Shigella sp. recovered from patients admitted to Bouali Hospital, Tehran, Iran during 1999-2001. Pak J Biol Sci 2007; 10:2778-2780. [PMID: 19070104 DOI: 10.3923/pjbs.2007.2778.2780] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [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: 05/27/2023]
Abstract
The present study was conducted to determine the prevalence of serotypes and antibiotic resistance in Shigella spp. isolated from patients admitted to Bouali hospital, Tehran, Iran during 1999 to 2001. All cases of shigellosis that were diagnosed according to their clinical pictures and microbial cultures were included in current study. Patients' age ranged from 12 to 89 years. Overall, 52 patients (56%) and 41(44%) were males and female, respectively. From a total of 90 Shigella isolates, 40 strains were identified as S. sonnei (45%), 26 as S. flexneri (27.9%), 3 as S. boydii (3%) and 21 as S. dysenteriae (24%). More than 95% of the isolates were susceptible to ciprofloxacin, ceftriaxone and ceftizoxim, 70% to nalidixic acid and less than 50% to co-trimoxazole, tetracycline, ampicillin and fourazolodon.
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Affiliation(s)
- M J Hosseini
- Research Center of Molecular Biology, Baqiyatallah University of Medical Sciences, Tehran, Iran
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