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Search Results: 1 - 10 of 5569 matches for " Hassan Taghipour "
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Solving the independent set problem by sticker based DNA computers  [PDF]
Hassan Taghipour, Ahad Taghipour, Mahdi Rezaei, Heydar Ali Esmaili
American Journal of Molecular Biology (AJMB) , 2012, DOI: 10.4236/ajmb.2012.22017
Abstract: In this paper, the sticker based DNA computing was used for solving the independent set problem. At first, solution space was constructed by using appropriate DNA memory complexes. We defined a new operation called “divide” and applied it in construction of solution space. Then, by application of a sticker based parallel algorithm using biological operations, independent set problem was resolved in polynomial time.
Applying Surface-Based DNA Computing for Solving the Dominating Set Problem  [PDF]
Hassan Taghipour, Mahdi Rezaei, Heydar Ali Esmaili
American Journal of Molecular Biology (AJMB) , 2012, DOI: 10.4236/ajmb.2012.23030
Abstract: The surface-based DNA computing is one of the methods of DNA computing which uses DNA strands immobilized on a solid surface. In this paper, we applied surface-based DNA computing for solving the dominating set problem. At first step, surface-based DNA solution space was constructed by using appropriate DNA strands. Then, by application of a DNA parallel algorithm, dominating set problem was resolved in polynomial time.
Fine-Needle Aspiration in the Diagnosis of Thyroid Diseases: An Appraisal in Our Institution
Heydar Ali Esmaili,Hassan Taghipour
ISRN Pathology , 2012, DOI: 10.5402/2012/912728
Abstract:
Fine-Needle Aspiration in the Diagnosis of Thyroid Diseases: An Appraisal in Our Institution
Heydar Ali Esmaili,Hassan Taghipour
ISRN Pathology , 2012, DOI: 10.5402/2012/912728
Abstract: Objective and Aims. In the last two decades, fine-needle aspiration cytology (FNAC) of thyroid has been introduced as the most reliable and cost-effective method for diagnosing of clinically important thyroid disorders. The aim of our study was to determine the accuracy and reliability of FNAC in our center. Materials and Methods. Thyroid fine-needle aspiration cytology (FNAC) of 1639 patients from October 2007 to September 2011 was evaluated in our center. Only patients which had a solitary or multiple thyroid nodules were selected for FNA. The FNAC results are classified as benign, malignant, suspicious, and unsatisfactory. From above patients, 192 (11.7%) cases underwent surgery, and histopathologic examination was performed. By comparing the FNAC reports with the corresponding histopathologic results, the accuracy of thyroid FNAC was determined. Results. According to FNAC diagnostic criteria, there were 1054 (64.3%) benign cases, 128 (7.8%) malignant, 306 (18.66%) suspicious and 151 (9.2%) inadequate for diagnosis. In 192 cases, which underwent surgery, FNAC reports were compared with histopathologic results and statistical indices were calculated. The sensitivity, specificity, and accuracy were 91.6%, 100%, and 97%, respectively. These findings strongly support that FNAC as a useful technic for preoperative diagnosis of thyroid lesions. Conclusion. This technique is easy to perform, cost effective, minimally invasive with few complications. FNAC has high sensitivity in diagnosis of thyroid malignancy and also has high diagnostic accuracy in the evaluation of thyroid disorders. 1. Introduction During the last two decades, FNAC has emerged as the most reliable and cost-effective method in the diagnosis and management of clinically important thyroid disorders. Thyroid nodules are very frequent and it is estimated that 4–7% of adults have palpable enlargement of thyroid and ten times more have impalpable nodules [1, 2]. Thyroid nodules are more frequent among females, elderly people, history of irradiation to the head and neck, and a diet containing high amount of goitrogenes [1]. Most of the thyroid nodules are benign and fewer than 5% of them are actually malignant [2–4]. The high frequency of benign versus malignant nodules creates a dilemma; how to manage patients with thyroid nodules that most probably are benign. To overcome this dilemma, thyroid nodules in FNAC are classified as benign, malignant, suspicious, and insufficient for diagnosis. By considering this classification, clinicians will be able to decide if the thyroid nodule should be
Solving the 0/1 Knapsack Problem by a Biomolecular DNA Computer
Hassan Taghipour,Mahdi Rezaei,Heydar Ali Esmaili
Advances in Bioinformatics , 2013, DOI: 10.1155/2013/341419
Abstract:
Solving the 0/1 Knapsack Problem by a Biomolecular DNA Computer
Hassan Taghipour,Mahdi Rezaei,Heydar Ali Esmaili
Advances in Bioinformatics , 2013, DOI: 10.1155/2013/341419
Abstract: Solving some mathematical problems such as NP-complete problems by conventional silicon-based computers is problematic and takes so long time. DNA computing is an alternative method of computing which uses DNA molecules for computing purposes. DNA computers have massive degrees of parallel processing capability. The massive parallel processing characteristic of DNA computers is of particular interest in solving NP-complete and hard combinatorial problems. NP-complete problems such as knapsack problem and other hard combinatorial problems can be easily solved by DNA computers in a very short period of time comparing to conventional silicon-based computers. Sticker-based DNA computing is one of the methods of DNA computing. In this paper, the sticker based DNA computing was used for solving the 0/1 knapsack problem. At first, a biomolecular solution space was constructed by using appropriate DNA memory complexes. Then, by the application of a sticker-based parallel algorithm using biological operations, knapsack problem was resolved in polynomial time. 1. Introduction DNA encodes the genetic information of cellular organisms. The unique and specific structure of DNA makes it one of the favorite candidates for computing purposes. In comparison with conventional silicon-based computers, DNA computers have massive degrees of miniaturization and parallelism. By recent technology, about 1018 DNA molecules can be produced and placed in a medium-sized laboratory test tube. Each of these DNA molecules could act as a small processor. Biological operations such as hybridization, separation, setting, and clearing can be performed simultaneously on all of these DNA strands. Thus, in an in vitro assay, we could handle about 1018 DNA molecules or we can say that 1018 data processors can be executed in parallel. In 1994, Adleman introduced the DNA computing as a new method of parallel computing [1]. Adleman succeeded in solving seven-point Hamiltonian path problem solely by manipulating DNA molecules and suggested that DNA could be used to solve complex mathematical problems. In 1999, a new model of DNA computing (sticker model) was introduced by Roweis et al. [2]. This model has a kind of random access memory that requires no strand extension, uses no enzymes, and its materials are reusable. Sticker-based DNA computing has potential capability for being a universal method in DNA computing. Roweis et al. [2] also proposed specific machine architecture for implementing the sticker model as a microprocessor-controlled parallel robotic workstation. Thus, the operations
Investigation of the capability of regenerated rice husk silica to remove hydrogen sulfide pollution
Seyed Mahmoud Mehdinia,Puziah Binti Abdul Latif,Hassan Taghipour
Koomesh , 2012,
Abstract: Introduction: The main goal of this study was to investigate the capability of regenerated rice husk silicaafter saturation to remove Hydrogen sulfide (H2S). For this purpose, rice husk silica and regenerated ricehusk silica were used as adsorbents bed in filter.Material and Methods: A poly vinyl chloride filter with one liter of prepared bed was tested. Rice husksilica was prepared in a furnace at temperature of 800 oC for Four hours, after acid leaching. Saturated ricehusk silica was regenerated in a furnace at temperature of 800 oC for Four hours too. Removal efficiency,elimination capacity, and pressure drop were the three parameters to evaluate the filters bed. System wereoperated with empty bed residence time of 60 s and different inlet concentration of H2S from 10 to 300 partper million (ppm).Results: More than 98% of removal efficiency was observed for both packed filters at inletconcentrations of H2S. The maximum elimination capacity was 7.02 gm-3h-1 with H2S mass loading rateof 9.0 gm-3h-1 in the both beds. This study showed that at a 1.0 lmin-1 flow rate and differentconcentration of inlet H2S. There is no significant difference between the rice husk silica and theregenerated rice husk silica beds in the amount of removal efficiency (p< 0.01). Also, there is no significantdifference between these two beds in the amount of elimination capacity at the same condition (p< 0.01).Moreover, this study showed that the amount of pressure drop was undetectable (zero) in both filter’s bed.Conclusion: The results of this study showed the regenerated rice husk silica has the same performanceof the primary rice husk silica, Therefore it can be considered as a suitable and inexpensive bed to removeH2S at low concentration.
Nitrate Determination of Vegetables in Varzeghan City, North-western Iran
Parviz Nowrouz,Hassan Taghipour,Saeed Dastgiri,Yousef Bafandeh
Health Promotion Perspectives , 2012, DOI: 10.5681/hpp.2012.030
Abstract: Background: Vegetables play an important role in human nutrition. Nitrate content is a signifi-cant quality criterion to determine characteristic of vegetables. About 80% of nitrate intake in human is from vegetables and fruits. High dietary intake of nitrate is seen as an undesirable be-cause of its association with gastric cancer and infantile methemoglobinemia. Varzeghan, North-western Iran is one of the cities with high Age-standardized incidence rates (ASR) of gastric can-cer in Iran. Currently, in Varzeghan there is no available and accurate information describing ni-trate concentration as one of the important risk factors of vegetables for human consumption.Methods: In this cross sectional study totally 11 types of vegetables (cabbage, lettuce, spinach, parsley, coriander, dill, leek, fenugreek, tarragon, fumitory and mint) from several different green-grocery of Varzeghan were collected in spring (April) and autumn (November and December) 2011 and their nitrate contents were analyzed.Results: Mean nitrate contents at the above noted fresh vegetables were 161, 781, 83, 707, 441,501, 1702, 684, 805, 772 and 191 mg NO3-kg-1 respectively. In none of the 11 fresh vegetablesnitrate content were not more than established limitations.Conclusion: Nitrate concentrations were below of others reported at different countries. The mean concentration of nitrate at all vegetables in autumn was higher than in spring significantly.
Heavy Metals Concentrations in Groundwater Used for Irrigation
Hassan Taghipour,Mohammad Mosaferi,Mojtaba Pourakbar,Feridoun Armanfar
Health Promotion Perspectives , 2012, DOI: 10.5681/hpp.2012.024
Abstract: Background: The main objective of this study was characterization of selected heavy metals concentrations (Lead, cadmium, copper, zinc, nickel and chromium) in groundwater used for ir-rigation in Tabriz City's countryside.Methods: After consulting with the experts of agriculture department and site survey, 38 irriga-tion water samples were taken from different farms (34 wells) without primary coordination with farm owners. All of samples were acidified to achieve pH≈2 and then were concentrated from 10 to 1 volume. The concentrations of Cd, Pb, Cu, Cr, Ni, and Zn in the samples (totally 228) were determined with a flame atomic absorption spectrophotometer.Results: In none of 38 farms, irrigation with surface runoff and industrial wastewater was ob-served. The average concentrations of Cd, Pb, Cu, Cr, Ni, and Zn in the irrigated water were de-termined 6.55, 0.79, 16.23, 3.41, 4.49, and 49.33μg/L, respectively. The average and even maxi-mum concentrations of heavy metals in the irrigation water at the studied area were less than toxicity threshold limits of agricultural water.Conclusion: Currently, not using of surface runoff and industrial wastewater as irrigation water by farmers indicates that the controlling efforts by authorities have been effective in the area. Water used for irrigation of the farms and groundwater of the studied area are not polluted with heavy metals and there is no risk from this viewpoint in the region.
Corrosion and Scaling Potential in Drinking Water Distribution System of Tabriz, Northwestern Iran
Hassan Taghipour,Mohammad Shakerkhatibi,Mojtaba Pourakbar,Mehdi Belvasi
Health Promotion Perspectives , 2012, DOI: 10.5681/hpp.2012.013
Abstract: Background: This paper discusses the corrosion and scaling potential of Tabriz drinking waterdistribution system in Northwest of Iran. Internal corrosion of piping is a serious problem indrinking water industry. Corrosive water can cause intrusion of heavy metals especially lead in towater, therefore effecting public health. The aim of this study was to determine corrosion andscaling potential in potable water distribution system of Tabriz during the spring and summer in2011.Methods: This study was carried out using Langlier Saturation Index, Ryznar Stability Index,Puckorius Scaling Index, and Aggressiveness indices. Eighty samples were taken from all over thecity within two seasons, spring, and summer. Related parameters including temperature, pH, totaldissolved solids, calcium hardness, and total alkalinity in all samples were measured in laboratoryaccording to standard method manual. For the statistical analysis of the results, SPSS software(version 11.5) was usedResults: The mean and standard deviation values of Langlier, Ryznar, Puckorius andAggressiveness Indices were equal to -0.68 (±0.43), 8.43 (±0.55), 7.86 (±0.36) and 11.23 (±0.43),respectively. By survey of corrosion indices, it was found that Tabriz drinking water is corrosive.Conclusion: In order to corrosion control, it is suggested that laboratorial study with regard tothe distribution system condition be carried out to adjust effective parameters such as pH.
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