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Search Results: 1 - 10 of 403377 matches for " M Seyed-majidi "
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Ameloblastomatous calcifying odontogenic cyst; a case report
M Seyed-majidi,K Nosrati,S Haghanifar
Journal of Isfahan Dental School , 2009,
Abstract: Introduction: Calcifying odontogenic cyst (COC) is an uncommon developmental odontogenic cyst first described by Gorlin in 1962. It is considered as extremely rare and accounts for only 1% of jaw cysts reported. Because of its diverse histopathology, there has always been confusion about its nature as a cyst, neoplasm or hamartoma.Case Report: In this report, we present a rare case of calcifying odontogenic cyst with ameloblastic proliferation, an extremely rare histologic variant, in a 15 year old female in the left mandibular molar region. The lesion was surgically removed. After enucleation and curettage, no recurrence recorded in next two years.Conclusion: Ameloblastomatous calcifying odontogenic cyst, microscopically resembles unicystic ameloblastoma except for the ghost cells and dystrophic calcifications within the proliferative epithelium. There has always been confusion about its nature as a cyst, neoplasm or hamartoma. Microscopically, this cyst shows ameloblastic proliferation in the connective tissue but no characteristics of basal cell hyperchromatism, vacuolization and nuclear polarization which is often seen in ameloblastoma, are present here. Ameloblastoma ex COC and ameloblastomatous COC are morphologically and clinically entirely different and easily distinguishable.Key words: Calcifying odontogenic cyst, Ghost cell, Gorlin Cyst, Ameloblastic proliferation
Immunohistochemical Evaluation of P53 Expression in Dental Follicle and Dentigerous Cyst
M Seyed Majidi,SH Shafahi,H Ehsani
Journal of Isfahan Dental School , 2007,
Abstract: Introduction: The survey was aimed to immunohistochemical evaluation of P53 expression in dental follicle and dentigerous cyst according to the capability of creating neoplastic changes in dentigerous cyst.Methods and Materials: Twelve cases of dentigerous cyst which has been supplied from archives of oral and maxillofacial pathology department of Babol School of Dentistry, from March 2004 to March 2006 and twelve cases of dental follicle supplied from surgery of impacted third molar of people visited oral & maxillofacial surgery department of Babol School of Dentistry during 2006 were selected. Five microns slices were gotten from paraffin block stained with P53 antibody, using immunohistochemical procedure. The observing of all the stained slides was done according to H-score gradation; it has been considered a degree of staining intensity of epithelial cells and the percent of stained epithelial cells. Then the aggregate of these two elements announced as final score. The results have been analyzed with Mann Whitney test using SPSS soft ware.Results: The expression of P53 in dentigerous cyst was more than dental follicle. (p value = 0.001). In relation with the percent of cells stained by P53 (p value > 0.0001), this difference has been more than intensity of staining. (p value = 0.021).Conclusion: The expression of P53 in dentigerous cyst was more than dental follicle (p value < 0.05). It seems we can distribute this difference to the capability of creating of neoplastic changes in dentigerous cyst.Key words: P53, Dentigerous cyst, Dental follicle
An Evaluation on the Importance of Phosphotungstic Acid Haematoxyiin (PTAH) Staining in Differential Diagnosis of Salivary Gland Neoplasms
F Baghaie Naeini,E Yazdi,M Seyed Majidi
Journal of Dental Medicine , 2003,
Abstract: The differential diagnosis between pleomorphic adenoma, the most common salivary gland neoplasm, microscopically, and two other common salivary gland neoplasms, meaning adenoid cystic carcinoma and mucoepidermoid carcinoma, is difficut.The purpose of this study was to determine the differences between pleomorphic adenoma, adenoid cystic carcinoma and mucoepidermoid carcinoma regarding the staining intensity with PTAH and H&E and also to investigate the relationship between staining intensity with PTAH and malignancy grade in mucoepidermoid carcinoma. 72 paraffin embeded samples including 24 pleomorphic adenoma, 24 adenoid cystic carcinoma and 24 mucoepidermoid carcinoma were selected and stained with PTAH. The staining intensity in total, in nucleus and cytoplasm of tumoral cells were evaluated and compared with H&E staining, statistically. The results were analyzed by Kruskal-Wallis, and Wilcoxon signed ranks tests (P<0.05).The logistic model was presented to predict the degree of malignancies through the assessment of nucleus and cytoplasm staining intensity in tumoral cells, and the patient's age. In this study, a statistically significant relationship was observed between staining intensity by PTAH and H& E in nucleus of tumoral cells in pleomorphic adenoma. Moreover, statistically significant relation between staining intensity by PTAH and H & E in cytoplasm of tumoral cells in adenoid cystic carcinoma was found. But there was no relation in other cases. On the other hand, a statistically significant relation between intensity of staining in total, in nucleus and cytoplasm of tumoral cells and the type of tumor was found. No relation was obtained between malignancy grade of mucoepidermoid carcinoma and staining intensity in total, in nucleus and cytoplasm of tumoral cells. The presented logistic model indicated a direct relation between tumor malignancy with patient's age and staining intensity in nucleus of tumoral cells, but a reverse relation was found between cytoplasm staining intensity in tumoral cells and tumor malignancy.Our findings show that PTAH and H & E staining methods, lead to similar results, however, PTAH staining is a reliable method in differential diagnosis of such salivary gland tumors.
Comparison of the effects of two anesthesia maintenance methods by remifentanil or halothane on endoscopic sinus surgery condition
Seyed mojtaba Karimi,Reza Jalaeian,Mohammadreza Majidi,Mohammad Marbootian
Iranian Journal of Otorhinolaryngology , 2008,
Abstract: Introduction: Endoscopic surgery is a new standard method of treatment for chronic sinusitis. During this operation even small amount of bleeding may reduce the visual field of surgeon significantly and make the procedure troublesome. In this study we have compared the operative condition between patients who receive either remifentanil or halothane for general anesthesia. Materials and Methods: Endoscopic sinus surgery was performed in 60 patents. Pre- medication was done by fentanil and midazolam and induction was done by propofol and atracurium. Halothane or remifentanil was used in two groups of patients respectively for anesthesia maintenance. Monitoring was performed during anesthesia. Bleeding volume was measured and operation field condition was assessed by the surgeon. Results: Personal characteristics such as age and sex were the same in both groups. Intra- operative systolic blood pressures was significantly lower in remifentanil group but diastolic and mean blood pressure and heart rate didn’t change after induction and during maintenance in both groups. Recovery time in remifentanil group was also significantly shorter than halothane group. Finally bleeding volume was lower and operation field condition was better significantly in remifentanil group. Conclusion: Remifentanil is a good choice to maintain an ideal anesthesia for endoscopic sinus surgery.
Occupational Exposure to Infrared Radiation in Aluminum and Cast-Iron Foundries in Zanjan, Iran
Faramarz Majidi,Kamaledin Abedi,Seyed Reza Azimi Pirsaraei
International Journal of Occupational Hygiene , 2011,
Abstract: The harmful effects of the long-term ocular exposure to cumulative levels of infrared radiation (IR) in glassblowing and foundries have been recognized since the late 19th century. These effects include cataracts, keratitis, and chronic dry eye problems. Therefore, infrared radiation measurements are critical and need to be assessed regularly in the industries and workplaces where there are high temperature furnaces, such as in the glass industries and foundries. However, IR measurement is not very simple, especially when the range of interest is one in which radiometers are not available, as for the IR-B and IR-C ranges, and commonly available radiometers have a limited sensitivity range. The present article deduce a calculation method for evaluating of IR irradiance based on Planck's radiation law for black body radiation and using an IR detector sensitive in the spectral range 750-1150 nm. Based on this method, workers exposure was assessed to all harmful wavelength ranges of IR radiation in three foundries (two aluminums and one cast-iron). The results suggested that IR-A and IR-B radiation (wavelength from 770 nm to 3000 nm) in the mentioned foundries were more than TLVs (threshold limit values) given by ACGIH. There were significant risks of health hazards due to IR radiation exposure. Personal protective equipment should be used in order to prevent serious damage to eyes and skin, and selection of appropriate equipment should be on an individual basis due to different radiation exposure.
An approach to Determine the Revenue Share of Each FACTS Device under Deregulated Environment
M. Majidi Qadikolai,S. Afsharnia
Journal of Applied Sciences , 2009,
Abstract: Under deregulated environment, transmission networks are operated close to their constraints. In this situation, FACTS devices can be useful in secure system operation. The obtained benefits of these devices have not been quantified and distinguished. In this study, for the first time, a method is proposed to calculate the revenue share of each FACTS device in the network by considering the role of FACTS devices in congestion management, reliability improvement and voltage profile improvement. Moreover, this method provides suitable economic signals for optimal FACTS devices expansion planning. To verify the proposed method, a 9-bus power system has been simulated in MATLAB/Simulink and Optimization Toolboxes.
Pakistan Journal of Botany , 2008,
Abstract: Selection of drought adapted genotypes and efficient use of water are among the most important goals in the breeding programs. In order to study drought tolerance of three important species of millets, Proso millet (Panicum miliaseum), Foxtail millet (Setaria italica) and Pearl millet (Pennisetum americanum) were planted in a split-plot design with two irrigation treatments (well watered and 50% of irrigation requirement) and four replications in Birjand Agricultural Research Station, Iran. Deficit irrigation declined yield by reduction of seed number per ear and ear number per plant. This reduction was greater in Proso millet than the other two species. In addition, although, drought stress caused a reduction in WUE of Proso millet, it increased WUE in the other ones. Harvest index also reduced in the presence of drought stress due to of both seed per ear and per plant reduction. Tillering started earlier in Proso millet than the other millets. Although, stem elongation started earlier in foxtail millet than the other millets, but its ear was emerged very late. Water stress caused reduction in the number of tiller and ear, peduncle and ear length and plant height. On the whole, foxtail millet showed the greatest yield in both stress and non-stress conditions.
Pakistan Journal of Botany , 2008,
Abstract: In order to examine the responses of proso millet (Panicum miliaceum) to drought stress in different growth stages, four breeded genotypes and a local one of proso millet were selected and planted in a split-plot design with five irrigation treatments and three replications. This experiment was conducted in two locations, Birjand and Sarbisheh, east of Iran. Irrigation treatments included well- watered, drought stress at vegetative stage, ear emergence stage, seed filling stage and vegetative and seed filling stages were considered as main- plots. The first five mentioned genotypes were considered as sub-plots. Drought stress caused a great reduction in grain yield and WUE at ear emergence stage. This reduction represented itself in the number of seed per ear and the weight of seeds, but it didn’t have any effects on the number of ear per plant. At ear emergence stage, the drought stress increased the floret death and loss of seed size which resulted in the reduction in the harvest index of both ear and seed per plant. Comparison of genotypes indicated that K-C-M.4 had a greater number of ears and K-C-M.9 had heavier seeds that had higher grain yield. These two genotypes had the highest WUE and their harvest indices were relatively higher. Due to the salinity of water and infertility of soil in Birjand, the grain yield was lower compared with Sarbisheh. Based on these results, genotype K-C-M.4 proved to be more suitable for both areas.
Effects of Endophyte Fungi on Seed Yield and Its Related Traits in Tall Fescue
M. M. Majidi,A. F. Mirlohi
Journal of Science and Technology of Agriculture and Natural Resources , 2007,
Abstract: Seed traits are an important measure of the effects of endophytic fungi in Festuca genus. In this study, endophyte-infected (E+) and un-infected (E-) clones of the same tall fescue genotypes were used to investigate the effects of endophyte on the seed production and associated traits. Endophyte infection resulted in 32.8% increase of total seeds by weight, 34.6% seeds per plant, and 30.6% panicles per plant, but other seed components were not affected by endophyte. Significant phenotypic variances were observed for traits except for 1000 seed weight. Plant genotype×fungal status interactions occurred for seed per plant. These interactions occurred largely because of variation in different plant genotypes. Genetic variance for this trait in E+ was greater than E- for both years, suggesting that the endophyte can mask plant genotypic variance. The results indicated that endophyte had a positive effect on seed production but could result in overestimating of plant genetic variance for some traits. In conclusion, breeding strategies should consider presence or absence of endophyte and the possible effects on variances.
Multivariate Statistical Analysis in Iranian and Exotic Tall Fescue Germplasm
M.M Majidi,A Mirlohi
Journal of Science and Technology of Agriculture and Natural Resources , 2009,
Abstract: This experiment was conducted to investigate the genetic diversity, identify traits explaining yield variation, recognize relationships between traits and classify accessions in a Iranian and forign germplasem of tall fescue. Forty six Iranian and foreign tall fescue accessions were surveyed for Phenological, morphological and agronomical characters in a randomized complete block design with three replications in field for 2 years. Significant differences were observed for all of the characters, indicating broad variation in this germplasm. Iranian accessions had a better performance for most of the traits in both years indicating their high potential for developing commercial varieties in breeding programs. Basis on stepwise regression analysis, crown width justified the majority of hay yield variation, followed by establishment rate, percentage of dry matter, height and number of stem. Hence, these characters could be used for selecting high yielding cultivars. Factor analysis revealed 4 factors which explained more than 80 percent of the total variation and confirmed the results of regression analysis. Using UPGMA method, cluster analysis revealed five groups. Accessions with similar country of origin or same ecological conditions were grouped in same cluster. Regarding the morphological characters the best accessions were identified to be used in the further breeding projects.
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