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Search Results: 1 - 10 of 144671 matches for " F. Tabatabaei "
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Static Parameters of Hadrons and Quantum Groups
F. Kazemi Tabatabaei
Physics , 1995,
Abstract: We study the static properties of hadrons, assuming quantum group symmetry. We calculate the magnetic moment, axial form factor and A-symmetry, using $SU_q(2)$ and $SU_q(3)$ quantum groups. The results are fitted with experimental data, giving an interval of $0.9
Investigating the Correspondence between Clinical and Histopathologic Diagnosis of Premalignant and Malignant Epithelial Lesions in Oral Mucosa
H Tabatabaei Tabatabaei,MH Akhavankarbasi,M Danesh Ardakani,F Gharaati
Journal of Shahid Sadoughi University of Medical Sciences , 2013,
Abstract: Introduction: Early diagnosis of malignant and premalignant lesions of oral mucosa has a definitive role in promotion of prognosis and life span of patients. This study aimed to investigate how accurate is a clinician‘s doubt regarding existence of premalignant and malignant of oral mucosal via the correspondence between clinical differential diagnosis and histopathologic diagnosis. Furthermore, it investigates factors that will probably help to decrease the lack of correspondence. Methods: Among 650 available files associated with 2001-2010 in archive of pathology department, the files that had at least one clinical differential diagnosis as leukoplakia, erythroplakia, erythroleukoplakia and SCC and also files with definite microscopical diagnosis as a dysplasia or a type of microscopical SCC were selected. Afterwards, it was analyzed utilizing statistical methods, t test, and fisher’s exact test. Results: The correspondence of clinical differential diagnosis significantly increased with age (p-value=0.047); however there was no significant difference regarding sex and site of lesions. Conclusion: Observing doubtful lesions particularly in women in any site of the oral cavity; the clinician should strongly suspect a malignant and premalignant lesion and take biopsy of the lesions, particularly in cases which there is no irritant factor for development of the lesion.
Potential Evaluation and Basin Modeling of the Pabdeh Formation in Zagros Basin: A Case Study  [PDF]
Hossein Tabatabaei
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.74035
Abstract: Pabdeh Formation is one of the most important source rocks in Zagros basin. In this study, thermal modeling and comparing of hydrocarbon potential evaluation of Pabdeh Formation in Mish Anticline and Gachsaran oil field have been investigated. For this reason, Rock-Eval pyrolysis was carried out on 21 cuttings samples collected from 2 boreholes (Well No. 55 and 83) of Gachsaran oil field and outcrop of Mish anticline. Accordingly, the Kerogen types of Pabdeh Formation in Gachsaran oil field are II, but in Mish anticline are type II and III. The amount of inert organic carbon determined for the Pabdeh Formation in Mish anticline is about 4.879 wt%, while for Gachsaran oil field, it is estimated at 0.153 (Well. No. 55) and 1.156 (Well. No. 83) wt%. Absorption of hydrocarbon by rock matrix was also determined. The amount of absorption in Mish anticline is more than that of Gachsaran oil field. This is mostly due to the presence of argillaceous matrix in this area, but the clays have not been successful in absorbing organic matter; this is due to the result obtained from small amount of organic matter in the basin. The Rock-Eval data revealed that the sedimentary paleo-environment strongly affected the source potential of this formation as it changed from the continental and Deltaic in the Mish anticline to deeper marine in Gachsaran oil field. In addition, curves of Burial history were drawn for Gachsaran well No. 55, in order to assess the thermal maturity of the Pabdeh formation. The results of the methods indicated that Pabdeh formation in Gachsaran oil field had a good to very good hydrocarbon potential and had entered to oil window.
Gitelman Syndrome: A Case Report
M Razaghy-Azar,F Tabatabaei
Tehran University Medical Journal , 2012,
Abstract: Background: Gitelman syndrome is a rare autosomal recessive disorder that typically presents with recurrent muscle cramps, carpopedal spasms, hypokalemic metabolic alkalosis, hypocalciuria and hypomagnesemia and high urine magnesium during adolescence. Mutation in the gene encoding for sodium chloride co-transporter in distal convoluted tubule causes electrolyte imbalance.Case presentation: We present a 10-year-old boy complaining of carpopedal spasms, tingling of fingers and facial parestesia for three years prior to his admission in endocrinology clinic of H. Ali-Asghar Pediatric Hospital. The patient had metabolic alkalosis, hypokalemia, hypocalciuria, increased urine fraction excretion of Mg, serum magnesium of 1.8 mg/dl, normal serum calcium and phosphorus and normal blood pressure. His clinical manifestations recovered after potassium and magnesium administration.Conclusion: A patient with Gitelman syndrome with normal serum Mg. is presented.
Evaluation of urine mercury level of dentists in Tehran and its influencial factors
Tabatabaei M.,Golbabaei F.,Shariatei B.
Journal of Dental Medicine , 2006,
Abstract: Background and Aim: Dentists are exposed to mercury from dental amalgam in their routine occupational practice. Excess exposure to mercury is harmful and the measurement of mercury content of urine is a reliable and valid assessment of the level of mercury exposure from dental amalgam. The aim of this study was the measurement of urine mercury in dentists of Tehran and assessment of some possible related factors. Materials and Methods: This cross-sectional study was performed randomly on 211 dentists in all regions in Tehran city (center, north, south, west, and east) between 1381 and 1383. Dentists were asked to give a sample of urine in the day of visit and to complete a questionnaire consisting of variables such as age, working history, handling of amalgam, environmental parameters and general health situation. Urine samples were analyzed by cold vapour atomic absorption spectrophotometry. Data were analyzed by Kruskall Walis, Kendall and Mann Whitney tests, with p<0.05 as the limit of significance. Results: The mean of urine mercury content in Tehran dentists was 3.1 (± 3.95) which was lower than the international TLV (Threshold Limit Value). There was a significant relation between urine mercury level and working hours per day (P=0.006). This relation was observed with working hours per week too (P=0.006). In general dentists, there was a positive relation between urine mercury and age (0.008) as well as the practicing years (P=0.034). A significant relation was found between urine mercury and the number of amalgam repairs and replacements in restorative specialists (p=0.039). There was a significant relation between the number of amalgam fillings in the mouth and urine mercury in general practitioners (p=0.027). The type of amalgam (predosed capsules or bulk powder) had a significant effect on the urine mercury content (P=0.001). There was no significant relation between urine mercury and other variables of the study such as the squeezing of triturated amalgam, storage method of residual amalgam, method of storing mercury and office ventilation. Conclusion: Based on the results of this study, the mean urine mercury content of dentists of Tehran was below the international TLV. The use of precapsulated amalgams had significant effect on the urine mercury. Most of the dentists were working in public or semiprivate clinics, so it is concluded that the level of general hygiene and specially mercury hygiene in these centers seems to be acceptable.
Evaluation of mercury vapor in dental offices in Tehran
Hasani Tabatabaei M.,Golbabaei F.,Shariati B.
Journal of Dental Medicine , 2007,
Abstract: Background and Aim: Dental Amalgam is a common restorative material for posterior teeth. Because of Hg content in the composition of amalgam, during the handling of material, mercury may release as vapor in the environment. Excess amount of mercury vapor can cause serious health problems in dental personnel. The aim of this investigation was to determine mercury vapor concentration in working environment of dentists in Tehran. Materials and Methods: 211 dental clinics were participated in this cross-sectional study. The clinics were randomly selected from different regions of Tehran (north, center, south, east and west). The dentists were asked to complete a questionnaire including items on demographic characteristics such as age, sex and work history, method of handling of amalgam, environmental characteristics and general health conditions. Environmental measurements of mercury vapor in dentists’ offices were done by mercury absorption tubes (Hydrar) and personal pumps (SKC, 222-3, England) as suggested in NIOSH method. Analysis of air samples was done by atomic absorption spectrophotometery (cold vapor). The data were analyzed by non-parametric tests (Kruskall Wallis, Mann-Whitney and Kendall).P<0.05 as the level of significance. Results: The mean mercury vapor concentration in dentists’ offices was 8.39(±9.68) μg/m3.There was no significant relationship between the urine mercury of dentists (3.107±3.95) and the air Hg vapor concentration of their offices. Using precapsulated amalgam showed significantly less Hg vapor than bulk amalgam (P=0.034). Also the surface area of working room and air Hg vapor (P=0.009) had a significant relationship (P=0.009 r=0.81). There was not any significant correlation between mercury vapor and other factors such as working hours per day and working days per week, squeezing of triturated amalgam or not, storage medium of set amalgam (water or fixer solution), mercury storage method and type of ventilation. Conclusion: The concentration of mercury vapor in dental offices' environment was lower than threshold limit value. Based on this study the type of amalgam (precapsulated or not) and area of the working room had significant effect on the mercury vapor concentration of environment.
Relating dust, gas and the rate of star formation in M31
F. S. Tabatabaei,E. M. Berkhuijsen
Physics , 2010, DOI: 10.1051/0004-6361/200913593
Abstract: We derive distributions of dust temperature and dust opacity across M31 at 45" resolution using the Spitzer data. With the opacity map and a standard dust model we de-redden the Ha emission yielding the first de-reddened Ha map of M31. We compare the emissions from dust, Ha, HI and H2 by means of radial distributions, pixel-to-pixel correlations and wavelet cross-correlations. The dust temperature steeply decreases from 30K near the center to 15K at large radii. The mean dust optical depth at the Ha wavelength along the line of sight is about 0.7. The radial decrease of the dust-to-gas ratio is similar to that of the oxygen abundance. On scales<2kpc, cold dust emission is best correlated with that of neutral gas and warm dust emission with that of ionized gas. Ha emission is slightly better correlated with emission at 70um than at 24um. In the area 6kpc
Effects of Storage Time on Quality Characteristics of Frozen Turkey Meat
M. Jouki,F. Tabatabaei,N. Khazaei,F. Motamedi Sedeh
International Journal of Animal and Veterinary Advances , 2012,
Abstract: The samples were stored at -18oC and undergone microbial analysis, chemical characteristics and sensory evaluation at 2-month intervals. Mean bacterial loads and coliform counts were 7.1×107±2.0×106 and 1.9×107±7.1×106 CFU/g. In this study, frozen storage was more effective than either treatment alone at decreasing total and coliform counts. Microbial analysis indicated that freezing storage had a significant effect (p<0.05) on the reduction of microbial loads. Frozen storage of samples months had no significant effect on their Total Volatile Nitrogen (TVN) contents during two-month storage, while storage more than 2 months significantly increased the PV and TVN for samples. Storage of packed meat under frozen condition enhanced product shelf life for 2 months without undesirable and detrimental effects on its sensory acceptability.
High-Speed Pin-Traveling Wave Photodetector Based on a Semiconductor Optical Amplifier Layer Stack on Semi-Insulating Inp Substrate
Mahmoud Nikoufard;F. S. Alaei Tabatabaei;S. N. Ghafouri
PIER C , 2012, DOI: 10.2528/PIERC12020503
Abstract: We present a pin-Traveling wave Photodetector (TWPD) on semi-insulating (SI) InP substrate at 1.55 μm wavelength window with an electrical bandwidth of more than 120 GHz, a line characteristic impedance of about 50 W, and microwave index matched to the optical group index. The internal quantum efficiency more than 99% for a 200μm long device is determined. The layer stack of the TWPD has previously utilized in a semiconductor optical amplifier (SOA). The TWPD can be monolithically integrated with passive and active components such as arrayed waveguide grating (AWG), Mach-Zehnder Interferometer (MZI), laser and modulator.
Reduction of Left Ventricular Hypertrophy by Sirolimus in Kidney Transplant Recipients: A Nonrandomized Clinical Trial
Sedghipour M,Tabatabaei SAH,Sadadi F,Kamal Hedayat D
Tehran University Medical Journal , 2012,
Abstract: Background: Persistence of left ventricular hypertrophy (LVH) in renal transplant recipients is associated with unfavorable outcomes. Calcineurin-inhibitor (CNI) nephrotoxicity is a major cause of morbidity and mortality after kidney transplantation. In this study we compared sirolimus (SRL) with calcineurin-inhibitor as primary immunosuppressants for the attenuation of left ventricular hypertrophy in renal transplantation recipients. Methods: In this prospective cohort study done in Shariati Hospital in 2010, we evaluated the effects of sirolimus and CNI on LVH of 55 renal transplant recipients. The cases (19) received sirolimus while the controls (36) received CNI while being matched for age and duration of transplantation. Data regarding blood pressure (BP), hemoglobin, serum creatinine, uric acid and lipid concentrations were assessed and changes in left ventricular (LV) mass were evaluated by echocardiography over a one-year follow-up. Results: Left ventricular mass significantly decreased (P=0.0001) in the SRL group but blood pressure did not differ between the two groups. LV mass and LV mass index both decreased significantly (P≤0.05) but the difference was not associated with changes in BP. The difference in interventricular septal thickness at end diastole (IVSD) and posterior wall diameter (PWD) were significant (P≤0.05) in the SRL group but the difference in end diastolic diameter (EDD) was not significant. Conclusion: Conversion from CNI to SRL-based immunosuppressive therapy in RTRs is safe and SRL may decrease LVH. SRL seems to be safe and improve renal function without cardiac compromise in kidney transplant recipients.
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