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Search Results: 1 - 10 of 324999 matches for " S. Nemati "
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Otosclerosis among first and second degree Relatives of Otosclerotic patients
S Soheilipour,S Nemati
Journal of Research in Medical Sciences , 2006,
Abstract: Background: Otosclerosis (OS) is the most common cause of conductive hearing loss in young population, and we determined incidence of OS among 1st and 2 nd degree relatives of surgically proved otosclerotic patients. Methods: In a cross sectional study among 43 surgically proved otosclerotic patients, positive family history of OS was determined. In suspicious cases, physical exam, tunning fork tests, and audiometry were performed. We also reviewed medical sheaths of admitted OS patients from 1995 to 2003 in Isfahan university hospitals for family history of OS. Results: Among 15 otosclerotic patients (34.88%) with positive family history of OS, 14 individuals of their first and second degree relatives had clinical and audiometric otosclerosis. Among 85 medical record sheaths of otosclerotic patients, 12 patients (27.9 %) had positive family history for OS. Conclusions: The incidence of clinical and audiometric otosclerosis among first and second degree relatives of OS patients is nearly similar to the rate of positive family history of our patients, which is relatively lower than other studies. Key words: Otosclerosis, family history, first and second degree relatives, hearing loss
Teaching reproductive endocrinology in Iran: Pilot assessment of hospital-based clinical modules for medical students at Tehran University of Medical Sciences  [PDF]
Batool H. Rashidi, Maryam Nemati, Mahya Ghazizadeh, Shala A. Salem, Gary S. Collins, E. Scott Sills
Health (Health) , 2013, DOI: 10.4236/health.2013.52024
Abstract:

This pilot study evaluated effectiveness and acceptance of a new hospital-based reproductive endocrinology curriculum among Iranian medical students. A voluntary, anonymous questionnaire was used to compare two teaching methods as applied to junior medical students at Tehran University of Medical Sciences. Students were randomly assigned to one of two clinical teaching settings; no student experienced both modules. Coursework for the pilot (experimental) group (n = 19) utilized a teaching approach comprising lectures, genetics laboratory, pelvic ultrasound, small group sessions, and opportunities to observe advanced reproductive technologies such as in vitro fertilization, ICSI, and embryo transfer. A control group (n = 34) received reproductive endocrinology instruction by the ‘traditional curriculum’, consisting mainly of lectures. Students were sampled at baseline and again atthe conclusion of their reproductive endocrinology session. Pre- and post-test data were analyzed for both groups; post-test differences between groups were also compared. No significant differences in mean age or gender mix were identified between the two study groups. Overall, the ques- tionnaire did not identify any significant intergroup differences for any parameter investigated. Although student acceptance rate appeared similar for both educational modules, the ratio of students having a “favorable regard” for reproductive medicine declined only among students randomized to the control group (41.2% vs. 32.3%). This report offers the first data on teaching reproductive endocrinology to medical students in Iran. Both traditional and innovative approaches to teaching reproductive endocrinology were well-accepted by students, although negative post-test responses were more common among students in the control group. While periodic quality assessments for existing clinical teaching methods are necessary, introduction of alternative teaching approaches is also important. Additional studies are planned to evaluate the impact this initiative may have on results on standardized tests measuring reproductive endocrinology knowledge, as well as election of further specialization in training.

Attitude Control of a Quadrotor with Optimized PID Controller  [PDF]
Hossein Bolandi, Mohammad Rezaei, Reza Mohsenipour, Hossein Nemati, S. M. Smailzadeh
Intelligent Control and Automation (ICA) , 2013, DOI: 10.4236/ica.2013.43039
Abstract: A new approach to control, stabilization and disturbance rejection of attitude subsystem of quadrotor is presented in this article. Analytical method is used to tune conventional structure of PID controller. SISO approach is implemented for control structure to achieve desired objectives. The performance of the designed control structure is evaluated through time domain factors such as overshoot, settling time and integral error index, and robustness. A comparison is done between designed controller and back-step controller applied to main model of quadrotor. The results of simulation show the effectiveness of designed control scheme.
Simple Bone Cyst of the Mandible: Report of Two Cases
M. Imanimoghaddam,A. Javadian Langaroody,S. Nemati,S. Ataei Azimi
Iranian Journal of Radiology , 2011,
Abstract: Despite their names, simple bone cysts are no longer categorized as cysts since they lack an"nepithelial lining. However, their nature remains controversial. The internal structure is totally"nradiolucent, sometimes showing multilocular appearance, although the lesion does not contain"ntrue septa and the ridges of bone is produced by the scalloping effect. We presented two cases"nof histopathologically confirmed simple bone cyst. Radiographic features such as multilocular"nappearance and significant buccal and lingual expansion are not usual findings for simple bone"ncyst, whereas evident in our presented cases.
Diagnostic Accuracy of Doppler Ultrasonography in Differentiation between Malignant and Benign Cervical Lymphadenopathies in Pediatric Age Group
M. Nemati,S. Aslanabadi,A.S. Bavil,D. Diaz
Pakistan Journal of Biological Sciences , 2010,
Abstract: Cervical lymphadenopathy is a relatively common finding in pediatric age group and is caused by a wide spectrum of diseases from transient infections to malignancies especially lymphomas. The present study was aimed at evaluating the diagnostic performance of grey-scale ultrasonography, color Doppler ultrasonography and power Doppler ultrasonography in differentiation of reactively and metastatically enlarged cervical lymph nodes in pediatric age group. Fifty children with cervical lymphadenopathies were assessed by ultrasonographic methods. In each patient, the longest (L) and transverse (T) diameters, L/T ratio and presence or absence of the normal hilar pattern were checked by grey-scale ultrasonography. Spectral parameters (resistive and pulsatility indices) and vascular distribution pattern of nodes were recorded by color and power Doppler ultrasonography, respectively. Following the ultrasonographic evaluations, biopsy and/or clinical follow up was applied for six months, based on the clinical and paraclinical findings. Statistical analyses were performed by chi-square test, independent t-test and receiver operator characteristic curves. The mean age of patients was 12.42±2.42 years. Twenty eight patients (56%) had malignant enlargement of lymph nodes. The mean value of L/T ratio in malignant group was 1.70±0.22 and 2.40±0.38 in non-malignant nodes (p<0.001). Sensitivity, specificity and accuracy of combined grey-scale and power Doppler ultrasonography were 70, 86 and 81%, respectively. Combination of grey-scale and power Doppler ultrasonography is recommended for the differentiation between the malignant and benign lymphadenopathies in children. Moreover, our findings revealed no diagnostic role of color Doppler ultrasonography in the selection of malignant cervical lymph nodes in children.
The effect of plant density and shoot pruning on growth and yield of two greenhouse bell pepper cultivars
S. Seifi,S.H. Nemati,M. Shoor,B. Abedi
Journal of Science and Technology of Greenhouse Culture , 2012,
Abstract: In order to investigate the effects of plant density and pruning on yield characteristics and growth of two bell pepper cultivars, a 2×3×2 factorial experiment was conducted in a complete randomized block design with three replications and three factors of plant density (2.5, 3 and 3.5 plants per m2), shoot pruning at two levels (without pruning and training plants with 3 main stems) and two bell pepper cultivars (Tomson and Maratos), in greenhouse of Ferdowsi University of Mashhad, Iran. The results showed that the effect of shoot pruning on yield per m2, yield per plant, fruit weight, number of fruits per plant and plant weight was significant (P<0.01). The effect of cultivar on plant height, shoot diameter and plant weight was significant (P<0.01), and also the amount of these parameters for Tomson cultivar was higher than Maratos cultivar. Plant density had a significant effect on total yield, average fruit weight, plant height, shoot diameter and plant weight. Plant density of 3.5 plants per m2 produced the highest yield (10.80 kg/m2) and 2.5 plants per m2 showed the lowest yield (6.95 kg/m2). Average fruit weight decreased with increasing plant density, such that 2.5 plants per m2 produced the highest fruit weight (109.8 g). Plant weight and shoot diameter decreased with increasing plant density, while plant height increased with higher plant density. Pruning decreased total yield, yield per plant, plant weight and number of fruits per plant, but it increased fruit weight. The results of this experiment showed that pruning of bell pepper plants caused an increase in fruit weight and improved fruit quality.
Leasing and a Comparison between the Different Lease Rental Calculations in Iran
Ali Nemati,Yadollah Nemati
International Journal of Business and Management , 2012, DOI: 10.5539/ijbm.v7n8p80
Abstract: Leasing as a form financing besides loans, increasing capital and using different tools of monetary and financial markets has the main role in financing of goods so that this type of financing become the 2nd after the direct loans for several years. Here, in this article leasing and its different types and phases of development briefly are defined and then lease rental calculation methods in Iran are focused on, their advantages and disadvantages are explained and compared and finally some suggestions are offered. This article aims to analyze and compare the ordinary bank method and the PMT methods in terms offer of the calculation procedures involved in each. Banks in the past used the ordinary bank method while leasing companies used both methods. This situation has, however, changed recently and banks and leasing companies both use the PMT method these days. The other aim of this study is calculation of the stepped method. The problems that customers might have in paying back the finance in the beginning of the payback period has led to the offering of the stepped method to customers to solve their problem. Because of rise of income in the following years, this method will help these customers in such a way that they have to pay smaller initial installments and pay the larger ones in the following years when their income increases.
Comparative evaluation of shear bond strength, between IPS-Empress2 ceramics and three dual-cured resin cements
Hajimiragha H,Nokar S,Nemati Z,Khajavi A
Journal of Dental Medicine , 2006,
Abstract: Background and Aim: Cementation is one of the most critical steps of the porcelain restoration technique. However, limited information is available concerning the bond strength of current ceramic bonding systems. The aim of this study was to evaluate the shear bond strength of three dual-cure resin cements to IPS-Empress2 ceramics. Materials and Methods: In this experimental study, 30 pairs of IPS-Empress 2 ceramic discs were fabricated with 10 and 8 mm diameters and 2.5 mm thickness. After sandblasting and ultrasonic cleaning, the surfaces of all specimens were etched with 9% hydrofluoric acid for 60 seconds. Then, the three groups of 10 bonded specimens were prepared ceramic bonding resin systems including Panavia F2, Variolink II and Rely X ARC. After storage in 37±1 c water for 24 hours and thermocycling in 5 c and 55 c water for 500 cycles with 1-minute dwell time, the shear bond strengths were determined using Instron machine at speed of 0.5mm/min. Data were analyzed by One Way ANOVA test. For multiple paired comparisons, the Tukey HSD method was used. The mode of failure was evaluated by scanning electro microscope (SEM). P<0.05 was considered as the limit of significance. Result: Significant differences were found between different cement types (P<0.05). Variolink II provided the highest bonding values with IPS-Empress2. A combination of different modes of failure was observed. Conclusion: Based on the results of this study, according to the highest mode of cohesive failure, Variolink II seems to have the strongest bond with IPS-Empress2 ceramics.
Estimation of Mandibular Premolar Teeth Length and Mesiodistal Width Based on Panoramic Radiograph
Haghanifar S.,Arash V.,Nemati R.,Bijani A.
Journal of Dentistry , 2011,
Abstract: Statement of Problem: In diagnostic studies of dentistry, estimation of the mesiodistal width of the unerupted teeth and the required space for their eruption in relation to the space analysis and evaluation of the root-crow ratio is of great importance. Purpose: This study aimed to evaluate the ratio between the real and radiographic length and mesiodistal width of mandibular premolars and provide a formula for prediction of the teeth length and mesiodistal width.Materials and Method: Fifty six extracted teeth of mandibular first and second premolars of patients and their panoramic radiographs with good quality were collected. The extracted teeth were divided into four groups: T34 (lower left first premolar), T44 (lower right first premolar), T35 (lower left second premolar), and T45 (lower right second premolar). Then the length and mesiodistal width of both the panoramic images and the extracted teeth were measured. All of the obtained data were analyzed through t-test, two tailed student and linear regression model.Results: It was shown that the vertical magnification of the mandibular first premolars was almost 11.4%-12.1% and that of the mandibular second premolar was almost 16%. The horizontal magnification of the mandibular first premolar was almost 15% and that of the mandibular second premolar was almost 26%. No statistically significant differences were found between the true and radiographic length and mesiodistal width and the magnifications of the left side premolars compared with right side premolars. To determine the real mesiodistal width and length size, some equations are introduced.Conclusion: The panoramic radiographs taken in this research by X-ray imaging machine are feasible and reliable for estimating the actual premolar teeth length and mesiodistal width using specific equations for each teeth in the lower jaw.
Induction of Somatic Embryogenesis in Saffron Using Thidiazuron (TDZ)
M. Sheibani,A.V. Azghandi,S.H. Nemati
Pakistan Journal of Biological Sciences , 2007,
Abstract: In vitro propagation of saffron either through somatic embryogenesis or cormogenesis is considered to be an efficient alternative method for large-scale propagation of pathogen-free corms. In order to develop an efficient protocol for in vitro propagation of saffron, a factorial experiment was carried out based on completely randomized design to investigate the effects of various concentrations of TDZ (0, 0.1, 0.25 and 0.5 mg L-1) on somatic embryogenesis induction from 5 different types of corm explants (terminal or axillary buds, upper or lower parts of the corm tissue and terminal buds from pre-treated corms at 4°C for 2 weeks). The results revealed that TDZ concentrations affected the induction of somatic embryogenesis significantly while different types of corm explants showed no significant effect on this process. Among TDZ concentrations used, 0.5 mg L-1 was the most effective treatment for embryogenesis induction. Embryogenic calli (globular stage) proliferated well when subcultured into MS medium supplemented with 0.25 mg L-1 TDZ before transferring to hormone-free MS medium containing 6% sucrose for maturation (scutellar or horn-shape stage). Matured embryos were transferred to half strength MS medium without growth regulators for further development, from which microcorms were produced at the basal part after 3 months.
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