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Search Results: 1 - 10 of 41 matches for " Maasumeh Tohidi "
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Mixed Medullary-Follicular Carcinoma of the Thyroid
Maasumeh Tohidi,Gholamreza Pourbehi,Mohammad Bahmanyar,Seyed Sajjad Eghbali,Mohammadreza Kalantar Hormozi,Iraj Nabipour
Case Reports in Endocrinology , 2013, DOI: 10.1155/2013/571692
Abstract: Introduction. Mixed medullary-follicular thyroid carcinoma is an uncommon tumor that consists of both follicular and parafollicular cells. Case. We report a 43-year-old woman with a palpable mass in the right side of the neck. Fine needle aspiration suggested a diagnosis of high grade anaplastic carcinoma that has been associated with papillary features. Total thyroidectomy was done in which histopathological examination showed diagnosis of medullary carcinoma. Immunohistochemical staining was positive for chromogranin, calcitonin, and thyroglobulin in tumoral cells. Conclusion. Mixed medullary-follicular thyroid carcinoma is a rare tumor. Diagnosis of these tumors with fine needle aspiration is very difficult and may lead to misdiagnosis. It is necessary to correlate the cytological finding with serum calcitonin and thyroglobulin. Also immunostaining for calcitonin and thyroglobulin confirms diagnosis. 1. Introduction Medullary thyroid carcinoma (MTC) is a neuroendocrine tumor that originates from parafollicular or c-cells of the thyroid gland [1]. MTC accounts for 5–10% of all thyroid carcinomas. A characteristic feature of this tumor is production of calcitonin. Most MTCs (80%) are sporadic and others (20%) are familial [2, 3]. Pfaltz et al. in 1959 reported that MTC is a tumor with solid-nonfollicular pattern, and it is different from other thyroid carcinomas clinically and pathologically [4]. Also it was noted that histological appearance of MTC may be atypical, and follicular structures can be seen in it. Also it was shown that these tumors have positive immunoreactivity for calcitonin and thyroglobulin. Subsequently such tumors were named mixed medullary-follicular carcinoma [4, 5]. Mixed medullary-follicular carcinoma is a rare tumor of the thyroid. Less than 40 cases have been reported in the literature [4–8]. The cellular origin of the mixed medullary-follicular tumors is unknown. Here we report a particular presentation of a mixed medullary-follicular carcinoma in which fine needle aspiration showed anaplastic carcinoma and mixed medullary-follicular thyroid carcinoma confirmed after thyroidectomy. 2. Case A 43-year-old woman presented with a palpable mass in the right side of the neck, increasing in size over several months. Physical examination revealed a 4?cm ?×? 4?cm, well-defined nontender nodule in right thyroidal lobe. There were no other physical abnormalities. The patient didnot smoke. Her family history was negative for thyroid and other endocrine tumors. The patient had no history of neck or whole body radiation. The plasma levels
Legendre Approximation for Solving Linear HPDEs and Comparison with Taylor and Bernoulli Matrix Methods  [PDF]
Emran Tohidi
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.35063
Abstract: The aim of this study is to give a Legendre polynomial approximation for the solution of the second order linear hyper-bolic partial differential equations (HPDEs) with two variables and constant coefficients. For this purpose, Legendre matrix method for the approximate solution of the considered HPDEs with specified associated conditions in terms of Legendre polynomials at any point is introduced. The method is based on taking truncated Legendre series of the functions in the equation and then substituting their matrix forms into the given equation. Thereby the basic equation reduces to a matrix equation, which corresponds to a system of linear algebraic equations with unknown Legendre coefficients. The result matrix equation can be solved and the unknown Legendre coefficients can be found approximately. Moreover, the approximated solutions of the proposed method are compared with the Taylor [1] and Bernoulli [2] matrix methods. All of computations are performed on a PC using several programs written in MATLAB 7.12.0.
Decrease of the Penalty Parameter in Differentiable Penalty Function Methods  [PDF]
Roohollah Aliakbari Shandiz, Emran Tohidi
Theoretical Economics Letters (TEL) , 2011, DOI: 10.4236/tel.2011.11003
Abstract: We propose a simple modification to the differentiable penalty methods for solving nonlinear programming problems. This modification decreases the penalty parameter and the ill-conditioning of the penalty method and leads to a faster convergence to the optimal solution. We extend the modification to the augmented Lagrangian method and report some numerical results on several nonlinear programming test problems, showing the effectiveness of the proposed approach.
The Influence of Naqshbandi Sheikhs on Educational Process of Timurid Era
Maasumeh Goodarzi,Aboulhassan Fayyaz Anoush
Asian Culture and History , 2013, DOI: 10.5539/ach.v5n1p79
Abstract: In the ninth century (A.H.) the number of Sufis and their sects increased due to Timurids’ attention to Sufis, and as a consequence convents (Khaneqa) became one of the most important economical and political centers. Excessive wealth and spiritual influence of Sufis leaders particularly Sheikhs of Naqshbani kingdom result in Sufism power being twice as much so that, Timurid kings and Sultans used their spiritual influence to legitimize their rules and tried not only to respect and honor them but also, to construct and operate their Khaneqas. Close relationship between Naqshbani’s leaders and Timurid Sultans had a great influence on most country’s affairs, particularly education and training as most of removal and installations in the field of educational affairs were under their views. In this survey, the impact of Naqshbandi’s Sheikhs on educational process during Timurid period was investigated and analyzed by citing library references and implementing analytical-descriptive method.
Numerical Solution of a Class of Nonlinear Optimal Control Problems Using Linearization and Discretization  [PDF]
Mohammad Hadi Noori Skandari, Emran Tohidi
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.25085
Abstract: In this paper, a new approach using linear combination property of intervals and discretization is proposed to solve a class of nonlinear optimal control problems, containing a nonlinear system and linear functional, in three phases. In the first phase, using linear combination property of intervals, changes nonlinear system to an equivalent linear system, in the second phase, using discretization method, the attained problem is converted to a linear programming problem, and in the third phase, the latter problem will be solved by linear programming methods. In addition, efficiency of our approach is confirmed by some numerical examples.
Cutaneous leishmaniasis Parasite Identification via PCR in the Infected Areas in Golestan Province
Farideh Tohidi,Afsane Barghei
Knowledge & Health Journal , 2011,
Abstract: Introduction: Classification and identification of parasite species Leishmaniasis has been mainly based on the clinical features, geographical distribution and size of the parasite. Noting the limitations of this division, this study aimed to determine the epidemiological status and accurately determine the dominant parasite species based on molecular methods in the infected area in Golestan province as one of the foci of cutaneous leishmaniasis wet type (rural) in Iran. Methods: This is a descriptive analytical study that was performed on the 63 patients suspected with ulcers of leishmaniasis and referred to the laboratories of rural health centers from 2004 to 2007. The data collection instrument was a questionnaire containing demographic variables, such as age, sex and residence as well as clinical variables such as shape, type, location, number and size of ulcers, previous history of oscar, the number and location of the scar. Along with the completion of questionnaires, direct samples from the wounds of patients and were taken and cultured in medium biphasic NNN (Novy, McNeill, Nicole).After the parasite growth in the culture ,then DNA was extracted and PCR experiments were performed. Results: Statistically significant relationship was found between species of Leishmania and ethnicity and gender (p <0.05). 100% (N=54) in the Turkmen ethnicity had Leishmania major, 100% (N=3) of patients of Sistani ethnicity had leishmania tropica. The 33/3% (N=2) of Fars ethnicity patients had major species and 66/7% (N=4) had the tropica. Most patients were from rural areas of Gonbad. The disease was observed in both sexes. The number of males (57/1%) was higher than women (42/9%). Conclusion: The study showed the dominant species of parasites in the infected area in Golestan Province was Leishmania major and its cutaneous leishmaniasis was of the rural type.
The Effect of Individual Health Education on Preventing School Students from Intestinal Parasitic Infection in Gorgan
Faredeh Tohidi,Mostafa Qorbani
Knowledge & Health Journal , 2009,
Abstract: Introduction: Children due to their lower immunity level and higher exposure to soil and other contaminated materials are more prone to parasitological diseases than adult. This study aimed at determining the effect of individual health education on preventing re-infection with intestinal parasites in elementary school students. Methods: In this experimental study two elementary girl schools were selected based on cluster sampling from which 119 students were randomly selected. Three stool samples of the subjects were tested by direct flotation and formalin-ether methods. Out of the 119 persons 40 persons had parasite infection. The infected people were randomly assigned to two groups. In addition to treatment the experimental group received instruction about parasite transition ways and prevention ways from parasitic infections. The control group however received only treatment. After two months stool samples of the two groups were collected and analyzed through Chi-square and estimating the risk ratio. Results: Out of the 40 infected participants 24.3% had pathogenic parasites and 9.2% had non- pathogenic parasites. After instruction 35% of the cases and 75% of controls showed parasitic infection again. The experimental and control groups were significantly different in terms of infection with parasitic worms (P=0.02 RR= 2.1 0.95 CI: 1.0 – 4.7). Conclusion: The results showed that individual health education reduces the risk of infection with intestinal parasites.
Physiological Responses of Broiler Chicks Fed Various Level of Dopamine and Zinc
Cyrus Farasati,Reza Tohidi
Pakistan Journal of Biological Sciences , 2007,
Abstract: The influences of dopamine (DA) and zinc (Zn) on some physiological parameters of plasma such as growth hormone, cholesterol, 3-glyceride and growth rate, feed conversion ratio and abdominal fat of broilers between the ages of 21 to 42 day were investigated. The experiment was designed on a total of 180 commercial meat-type chicks as a randomized complete block with a 3x2x2 factorial arrangement of treatments with three levels of DA (0, 50 and 100 mg kg-1) and two levels of Zn (0 and 40 mg kg-1) in each sex. At the first day of trial, chicks were randomly distributed in 36 boxes at the same condition until day 15. Then, the treatments were administered in a low dosage for acclimating of chicks to them. From day of 21, the main dose of treatments was used. The effects of DA and Zn and interaction between them on cholesterol concentration of plasma were significant (p<0.05). But the effects on concentration of growth hormone (GH) and 3-glyceride of plasma were not significant. The maximum concentration of cholesterol in plasma was observed in male chicks administered 40 mg kg-1 of Zn and the minimum concentration was related to female chicks administered 50 mg kg-1 of DA. In this period, the main and interaction effects of all treatments on weight gain mean of chicks were significant. Also, Zn and DA and interaction of DAxsex improved feed conversion ratio (p<0.05). The results of this experiment confirmed the lipolytic effect of DA on plasma cholesterol and abdominal fat and also showed that consumption of 100 mg kg-1 of DA plus 40 mg kg-1 of Zn cause to improve growth performance of male chicks.
The Comparison of Direct Microscopic Examination and Culture Results in Diagnosis of Cutaneous Leishmaniasis
Tohidi, F,Qorbani ,M
Medical Laboratory Journal , 2009, DOI: http://www.goums.ac.ir/mljgoums/index.php?&slct_pg_id=10&sid=1&slc_lang=en
Abstract: Background and Objectives: one of the endemic foci forCutaneous Leishmaniasis in Iran is Mashhad in which limitedoutbreak have recently been reported. The commonly used methodfor diagnosis is the clinical features confirmed by direct microspicexamination and culture or biopsy. We compared these two tests todetermine the level of their sensitivity, specificity and positivepredictive value.Material and Methods: we performed this comparative-analyticstudy on 73 patients suspected of having ulcers Leishmaniasis inMashhad, Iran. Giemsa was staining the smears and the samplescultivated on Di-phasic N.N.N. culture media . Analysis wasperformed by SPSS version 11.5 and Chi square test. A P- valueless than 0.05 were considered as a significant.Results: In 43 cases (58.9%), both the smear and culture arePositive. In 13 cases (17.8%), the smear is negative but the culturePositive. In 17 cases (23.2%), both smear and culture are negative.The two methods are positively correlated (82%). Sensitivity,Specifity, Positive predictive Value and negative predictive valueare 76.7%, 100%, 100% and 56.7%., respectively.Conclusion: when the smear is positive, there is no need forculture. However, the opposite is not true.Key words: Cutaneous Leishmaniasis, Laboratory Diagnostic,Direct Microspic Examination, Culture.
Robust Adaptive Fault-Tolerant Tracking Control of Three-Phase Induction Motor
Hossein Tohidi,Koksal Erenturk
Advances in Electrical Engineering , 2014, DOI: 10.1155/2014/915072
Abstract: This paper deals with the problem of induction motor tracking control against actuator faults and external disturbances using the linear matrix inequalities (LMIs) method and the adaptive method. A direct adaptive fault-tolerant tracking controller design method is developed based on Lyapunov stability theory and a constructive algorithm based on linear matrix inequalities for online tuning of adaptive and state feedback gains to stabilize the closed-loop system in order to reduce the fault effect with disturbance attenuation. Simulation results reveal the merits of proposed robust adaptive fault-tolerant tracking control scheme on an induction motor subjected to actuator faults. 1. Introduction With technology advances and modern control systems complexity increasing, rotating electrical machines play important roles in many fields especially in industrial processes because of their rigid, rugged, low price, reliable relative simplicity, and easy to maintain behaviors [1, 2]. However, the reliable electric drives are essential in all safety critical applications such as aerospace, transportation, medical, and military applications. In these applications, the reliability of electric drive systems must be ensured, and any failure in motor drives may result in loss of property and human life. Therefore, it is absolutely necessary for the motor drives (utilized in safety critical applications) in order to have a fault-tolerant capability and an ability to produce a satisfactory output torque even in the presence of faults [3–5]. That is why designing reliable drives has received great attention in the recent years. When a fault occurs in system components including sensors, actuators, and plant, it can cause performance reduction and the closed-loop system instability. Therefore, there is a crucial need to design a class of controllers to compensate the faults effects and guarantee system stability with acceptable performance. FTC design approaches develop controllers in order to guarantee system stability in the presence of faults and disturbances. They are classified as two main classes: passive FTC and active FTC [6–11]. In the passive FTC approach, robust control techniques are utilized to design a fixed controller for maintaining the acceptable system stability and performances throughout normal or faulty cases [11]. The passive FTC approach considers fault as a special kind of uncertainties, and consequently controllers are fixed and designed to be robust against a class of presumed faults. Then designing proper controllers becomes more conservative,
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