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Search Results: 1 - 10 of 2028 matches for " Mortazavi MR "
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Demographic and pathologic findings of squamous cell carcinoma of skin and lip in pathology department of Razi Hospital
Safaee Naraghi Z,Mortazavi MR,Omid A
Tehran University Medical Journal , 2001,
Abstract: Squamous cell carcinoma, a cancer of keratinocytes origin, mostly involves sun-exposed areas of the skin. To study the pathologic and demographic features of this disease, records of 395 patients of squamous cell carcinoma of skin and lip were reviewed. Most of the patients (83%) aged 40 years or more at the time of diagnosis. Respectively, 74.4% and 75.8% of cases with skin and lower lip carcinoma were men, but in upper lip cases frequencies of both sexes were equal. The number of patients referred from western and north-western provinces were much more than those of other provinces of the country. The most frequent histologic stage was grade I (53% and 58.8% in skin and lip carcinoma, respectively), showing that most patients visit physicians early enough, and are diagnosed in early stages of the disease.
Effect of bleaching on surface roughness of two nanofilled and a microhybrid composite
V Mortazavi,MH Fathi,MR Shirian
Journal of Isfahan Dental School , 2008,
Abstract: Introduction: Regarding the importance of surface roughness of tooth structure and restorativematerials on plaque retention, this study was done to evaluate the effect of home and officebleaching agents on surface roughness of microhybrid and nanofilled composite resins.Materials and Methods: Point 4 (kerr, USA) microhybride composite, Premise (Kerr, USA) andFiltek supreme (3M ESPE, USA) nanofilled composites, Opalescence PF (Ultradent, USA) as thehome bleaching agent and Opalescence Quisk (Ultradent, USA) as the office bleaching agent wereselected. One hundred and fifty samples were divided into 15 groups (n = 10). For each composite,five groups were defined as: control, two weeks home bleaching, 4 weeks home bleaching, one timeoffice bleaching and two times office bleaching with 2 weeks interval. The composites light curedunder clear matrix strip and polished with soflex TM (3M ESPE, USA) polishing disks systems.After bleaching with specific protocol, surface roughness of samples was measured withprofilometer (SM7 Profile Test, Italy). The data were analyzed with two-way ANOVA statisticaltest. Surface morphology of samples were analyzed with scanning electron microscopy; SEM(XL30, Philips, Netherlands).Results: There was no significant difference in surface roughness among all groups (p value >0.05). There were no difference between the surface morphology of control and experimentalgroups of each composite.Conclusion: The bleaching agents used in this study had no effects on surface roughness of twotypes of nanofilled composites and one type of microhybrid composite.Key words: Bleaching, Surface Raughness, Nano-filled composite, Micro-hybrid composites
Acanthosis nigricans, tripe palms and leser- trelat sign in a patient with carcinoid tumor
P Kafaie,MR Mortazavi zadeh,MH Rasoul zadegan
Journal of Shahid Sadoughi University of Medical Sciences , 2006,
Abstract: Acanthosis nigricans (AN), Tripe palm (TP) and sign of lesser trelat (LT) are rare dermatoses which are often seen with malignant conditions. Acanthosis nigricans occurs both on the skin and mucus membranes as velvety hyper pigmented lesions in the flexors and around the neck, or papillomatous and verrucous lesions on the lips and buccal mucosa. These para neoplastic dermatoses are generally linked with intra - abdominal malignancies, especially gastric adenocarcinomas and improvement of the associated dermatoses after treatment of the malignancy has been frequently observed, although it has also been observed with other malignancies. We report the case of a 44 year old woman who initially came to be treated for her mucocutaneous lesions, and with diagnosis of malignant AN was further studied for the initial malignancy and finally, her main malignancy was determined as carcinoid tumor.
The Determination of Promising Mineral Zones in 1:100,000 Varamin Sheet Based on Geochemical Studies (Heavy Minerals)  [PDF]
Seyyed Reza Mortazavi, Ghodratollah Mohammadi
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.68057
Abstract: In many parts of the world, data obtained from geochemical exploration of stream sediments are integrated with geological and geophysical data as one of the most efficient methods of exploring potential deposits at regional and semi-detailed scales. The aim of regional investigation is to study large areas to identify anomalies that might have been arisen from increased concentrations of an element or some elements in a region. A total of 78 geochemical samples were taken from Varamin sheet to identify regions of anomalies. The following information was used to perform a detailed geochemical exploration, in particular for geochemical sampling. 1) 1:100,000 geological map of Varamin. 2) 1:50,000 topographic maps of the region. 3) 1:100,000 airborne geophysical map of the region to locate shallow intrusions and hidden faults. The sampling network was designed using the above data and the analysis of 1:500,000 topographic maps. The sampling density was higher around faults and apparent and hidden intrusions, and lower in plains and lowlands.
The Role of Pediatric Dentist in Children's Undergoing Bone Marrow Transplantation
Mortazavi Sh
Journal of Dental Medicine , 2000,
Abstract: Bone marrow transplant (BMT) has increasingly become a common treatment option for patients whom has their bone marrow affected directly or indirectly by any disease. Because of the level of immunosuppression achieved in BMT, any problems the pediatric patient presents in their oral cavity can become life- threatening and increase the length of hospital stay, the patients discomfort and the treatment cost. This paper discusses the important and unique role that pediatric dentistry has in the multi professional bone marrow transplantation team to help bring out a successful outcome through the prevention and treatment of the acute oral complications often seen in these patients.
Investigation of various parameters influencing the duration of mucoadhesion of some polymer containing discs
Mortazavi SAR
DARU : Journal of Pharmaceutical Sciences , 2002,
Abstract: The aim of this study was to evaluate the effect of some important parameters on duration of adhesion of discs containing mucoadhesive polymers. For this purpose discs containing carbopol 934P (C934), polycarbophil (PC), sodium carboxymethyl cellulose (CMC) and hydroxypropylmethyl cellulose (HPMC) were prepared and the duration of their in vitro mucoadhesion were evaluated. Also the effect of the addition of various amounts of HPMC to other polymers, the effect of the test medium and prehydration of the test discs for 2 and 5 min prior to their placement in contact with the mucosal surface, on the duration of mucoadhesion of test discs were investigated. Results show that the addition of 25% HPMC increases the duration of mucoadhesion of all the tested polymers. The greatest duration of mucoadhesion with the anionic polymers CMC, C934 and PC was found to be at pH values above 4.0. The duration of mucoadhesion of HPMC containing discs were not greatly affected by the pH values above 2.2. However, at a pH value of 2.2 all of the investigated polymers showed the lowest duration of mucoadhesion. Finally, prehydration of discs containing HPMC, CMC or their combination before their placement on the mucosal surface resulted in a significant reduction in their duration of mucoadhesion. Discs containing only C934 or PC were far less affected by prehydration, especially after 2 min. Addition of HPMC to these discs greatly reduced their duration of mucoadhesion.
Mobile Phone Usage and the Risk of Brain Tumors  [PDF]
Naina Sawal, Amir Hossein Mortazavi Entesab
Occupational Diseases and Environmental Medicine (ODEM) , 2016, DOI: 10.4236/odem.2016.43006
Abstract: Purpose: This literature review investigated the possible association between the use of mobile phones and brain tumors. Methods: In brief, 11 publications were retrieved from JSTOR, PubMed, Google Scholar and Summon in order to compare the association between the usage of mobile phones in patients with a brain tumor and those without. Papers published in English, and after 2001 were selected for. There was no limit on age, gender, geographical location and type of brain tumor. Results: For regular mobile phone usage, the combined odds ratios (OR) (95% confidence intervals) for three studies are: 1.5 (1.2 - 1.8), 1.3 (0.95 - 1.9), and 1.1 (0.8 - 1.4), respectively. Furthermore, the odds ratio did not increase, regardless of mobile phone use duration. Additionally, Lonn et al. (2005) observed that the risk also did not significantly increase when assessing the laterality (ipsilateral or contralateral) of the tumor in relation to side of head used for the mobile phone. Kan et al. (2007) observed an OR of 1.22 when comparing analog phone to digital phone use. Conclusion: This review concludes that there is no current association between mobile phone use and the development of brain tumors. Although certain studies speak in favor of an increased risk, many are plagued with either: sampling bias, misclassification bias, or issues concerning risk estimates. Further research needs to be done in order to evaluate the long-term effect of mobile phone usage on the risk of developing a brain tumor.
Preparation and In-vitro Evaluation of Gastroretentive Bupropion Hydrochloride Tablets
F Fouladi, SA Mortazavi
Tropical Journal of Pharmaceutical Research , 2012,
Abstract: Purpose: To develop a gastroretentive formulation of bupropion hydrochloride in the form of floating tablets. Methods: Floating tablets were prepared by wet granulation method using various amounts of sodium carboxymethycellulose (NaCMC), different molecular weight grade of hydroxypropyl methylcellulose (HPMC) and varying amounts of fillers (microcrystalline cellulose, lactose and tricalcium phosphate). Sodium bicarbonate was also incorporated as the gas-generating agent. The formulations were tested for their physical properties, floating lag time, duration of floating and in-vitro drug release. Results: All the tablet formulations containing either HPMC K4M or HPMC K15M as the sustained release polymer together with either microcrystalline cellulose (MCC) or lactose, floated in the release medium for > 10 h. Tablets prepared with MCC released ≥ 79 % of the drug after 10 h, while those prepared with lactose released ≥ 85 % of the drug within the same period. Tablets containing NaCMC alone did not show good floating properties but when HPMC K4M was also incorporated at certain ratios, tablets with good floating behavior and suitable drug release patterns were produced. Drug release kinetic studies showed that formulations fitted best to the Higuchi model. Conclusion: The developed floating tablets of bupropion HCl exhibited prolonged drug release for ≥ 10 h, and, thus may improve bioavailability and minimize fluctuations in plasma drug concentration.
A Comparative Study Between the Strength and Duration of Mucosa-Adhesion of Transbuccal Carbomer Based Aqueous Gels
Seyed Alireza Mortazavi
Iranian Journal of Pharmaceutical Research , 2002,
Abstract: Mucosa-adhesive gels can be used as a useful mean of delivering drugs to or via mucosal membranes, and in particular buccal mucosa. Carbomers are among the best mucosa-adhesive materials known. The aim of this study was to compare the results obtained from the mucosaadhesive strength of aqueous gels containing Carbomers, either alone or in combination, to the data obtained from assessing the duration of mucosa-adhesion of these gels. Based on initial studies, a total Carbomer concentration of 2.0%w/v forms the most desirable gel. Furthermore, it was found that gels containing a combination of Carbomers 934P (C934), 971P (C971) and 974P (C974) form clear and transparent gels with good spreadability. Next, using these Crbomers, gels containing either one, two or all three Carbomers with a total polymer concentration of 2.0%w/v were prepared and tested for their mucosa-adhesive strength to rat small intestine (as model mucosa) in pH6.8 isotonic phosphate buffer at 37 oC. It was found that the presence of more than 0.4%w/v C971 in gels containing all three Carbomers, greatly reduce the mucosa-adhesive strength of the gel. Furthermore, it was found that a combination of C934and C974 at a total concentration of 1.6-1.8%w/v, along with 0.2-0.4%w/v C971 form gels with good clarity and spreadability as well as strong mucosa-adhesive strengths. Gels showing the greatest mucosa-adhesive strength and good general appearance and spreadability were then assessed in terms of their duration of mucosa-adhesion to rat intestine in pH6.8 isotonic phosphate buffer at 37 oC and under a constant applied force of 15.0g. The results obtained showed that a gel that has high mucosa-adhesive strength will not necessarily have a great duration of mucosa-adhesion. Hence, it is suggested that this important parameter should also be considered besides the test for assessing the mucosa-adhesive strength in the selection of aneffici ent transbuccal mucosa-adhesive drug delivery system.
g factor of the charged leptons in noncommutative spacetime
M Haghighat,N Mortazavi
Iranian Journal of Physics Research , 2011,
Abstract: The g-factor of the charged leptons has always been considered by many physicists, both experimentaly as well as theoretically. In fact the electron and muon g-factor play the main role in testing the QED as well as the standard model. Meanwhile, there is a discrepancy between the standard model prediction of the muon anomalies magnetic moment and its experimental determination as large as (25.5±8.0)×10-10.Therefore the g-factor can be used as the best place to study the new physics beyond the standard model. In this article, we consider the g-factor of the lepton in the noncommutative space time as a new physics model. In the ordinary theory, Schwinger evaluated the first correction to the g-factor of free electron, which arises from the electron interaction with photon at one loop level in the QED. In noncommutative space time, we show that at one loop, there is an NC-contribution to the g-factor of leptons which leads to a new bound on the noncommutative parameter (NC parameter). The obtained bounds are comparable with the current bounds on the NC-parameters of the order TeV.
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