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Search Results: 1 - 10 of 1465 matches for " Yousef Sadeghi "
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The effect of amygdala lesion on anterior claustrum kindled seizures in rats
Fariba Zafari,Masome Sabetkasaei,Yousef Sadeghi,Mohammad Mohammad-zade
Physiology and Pharmacology , 2008,
Abstract: Introduction: The claustrum interconnects with the allocortical and neocortical regions and also projects to the hippocampus and the amygdala. .The role of claustrum in the complex partial seizure is not clear. Thus in this study the effect of amygdala lesion on anterior claustrum kindled seizures in rat were investigated. Methods: Male Wistar rats, weighting 250-300 g, were received DC current via a bipolar electrode which is inserted in right basolateral amygdala. A tripolar electrode for stimulation and electroencephalography recording in the right anterior claustrum has been fixed. After a 10 days period of surgical recovery, animals were received kindling stimulation (60Hz, 2s, 1 ms pulse duration) daily, and kindling parameters were measured. In the control group animals did not receive DC current. In the lesion groups (2 groups) animals received DC current both before kindling stimulation and after full kindled statement respectively. Results: Our result showed that amygdala lesion, were capable of delaying claustrum kindling. The delay in kindling was due to an increase in the stimulation trials required to kindle to seizure stages. Furthermore the effect of this lesion on established kindled seizures reduced the severity of claustrum by decrease the stage 5 duration and after discharge duration. Conclusion: amygdale lesion had no effect on the expression of generalized seizures and claustrum play an important role in the propagation of epileptic seizure. Whereas the amygdala has a facilitators role in propagation claustrum kindled seizure.
Relevance of Mastery Learning (ML) in Teaching of English (Case Study of the University of Guilan, Iran)  [PDF]
Abbas Sadeghi, Atefeh Sadeghi
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.31007
Abstract: The main purpose of the study was to gather, analyze and interpret the perceptions of the students about mastery learning (ML) held by 240 students randomly selected from each of the populations of different faculties in Guilan University. Guilan University was chosen because the researchers have some valuable experiences about English learning and are familiar with students’ weakness in English learning. The students of high ability were allocated to “A” and “B” classes, average to “C” and “D” classes and low to “E” and “F” classes respectively. Two Academic Staff Members were assigned to teach the six classes of English. Students could take 3 classes with each academic. Results showed that based on research results on deep and surface, biased learners increasingly which became surface learners did worse compare with deep learners. On the other hand, surface students of low ability seem to be motivated to study as they are given more chances to secure a pass. Thus, although the findings of this paper indicate that mastery learning promotes better quantitative results in English for surface learners, there are dangers. One of the main aims of learning to increase higher level cognitive processes seems actually to be discouraged in this mode.
Pectin-Based Biodegradable Hydrogels with Potential Biomedical Applications as Drug Delivery Systems  [PDF]
Mohammad Sadeghi
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2011, DOI: 10.4236/jbnb.2011.21005
Abstract: In this work, synthesis and swelling behavior of a superabsorbent hydrogel based on Pectin (Pc) and polyacrylonitrile (PAN) were investigated. A mechanism for hydrogel formation was proposed and the structure of the product was es-tablished using FTIR spectroscopy. The Pc-poly (sodium acrylate-co-acrylamide) hydrogel exhibited a pH-responsive swelling-deswelling behavior at pH’s 2 and 8. This on-off switching behavior provides the hydrogel with the potential to control delivery of bioactive agents. Release profiles of ibuprofen (IBU), a poor water-soluble drug, from the hydro-gels were studied under both simulated gastric and intestinal pH conditions.
Subcellular localization of L-selectin ligand in the endometrium implies a novel function for pinopodes in endometrial receptivity
Reza Nejatbakhsh, Maryam Kabir-Salmani, Eva Dimitriadis, Ahmad Hosseini, Robabeh Taheripanah, Yousef Sadeghi, Yoshihiro Akimoto, Mitsutoshi Iwashita
Reproductive Biology and Endocrinology , 2012, DOI: 10.1186/1477-7827-10-46
Abstract: Endometrial biopsies of secretory phases from fertile females ranging in age between 25 and 42years were studied using several approaches, including scanning electron microscopy (SEM), immunostaining for light microscopy and transmission electron microscopy (TEM), and immunoblotting as well as statistical analysis of the area-related numerical densities of immunoreactive MECA-79-bound nanogolds to detect the expression pattern and the subcellular distribution pattern of L-selectin ligand (MECA-79) in human endometrium during the window of implantation.The endometrial biopsies were scored according the dating criteria of Noyes et al. by an experienced histologist. The SEM images of the midluteal phase specimens revealed that fully developed pinopodes were abundant in our samples. HRP-immunostaining and immunofluorescent staining as well as immunoblotting revealed that MECA-79 was expressed in the midluteal phase specimens. The results of immunogold TEM illustrated the expression of MECA-79 in human pinopodes in the midluteal phase and a higher area-relate numerical density in pinopodes compared to that of the uterodome-free areas.This is the first demonstration of the subcellular localization of MECA-79 in the human pinopodes which may indicate a novel role for pinopodes to be capable of shear-stress-dependent tethering-type adhesion in the initial phases of human embryo implantation.
Synthesis of Ba0.5Sr0.5Co0.2Fe0.8O3 (BSCF) Nanoceramic Cathode Powders by Sol-Gel Process for Solid Oxide Fuel Cell (SOFC) Application  [PDF]
Mohammad Ghouse, Yousef M. Al-Yousef
World Journal of Nano Science and Engineering (WJNSE) , 2011, DOI: 10.4236/wjnse.2011.14016
Abstract: The nano ceramic Ba0.5Sr0.5Co0.2Fe0.8O3 (BSCF) powders have been synthesized by Sol-Gel process using nitrate based chemicals for SOFC applications since these powders are considered to be more promising cathode materials for SOFC. Glycine was used as a chelant agent and ethylene glycol as a dispersant. The powders were calcined at 850℃/3 hr in the air using Thermolyne 47,900 furnace. These powders were characterized by employing SEM/EDS, XRD and TGA/DTA techniques. The SEM images BSCF powder indicate the presence of highly porous spherical particles with nano sizes. The XRD results shows the formation of BSCF perovskite phase at the calcination temperature of 850℃. From XRD line broadening technique, the average crystllite size of the BSCF powders were found to be around 9.15 - 11.83 nm and 13.63 - 17.47 nm for as prepared and after calcination at 850℃ respectively. The TGA plot shows that there is no weight loss after the temperature around 450℃ indicating completion of combustion.
Investigation on Tabriz University Teachers’ Experiences of the Ignored Curriculumin General Courses  [PDF]
Yousef Rezapour, Sajjad Purbaghban
Open Journal of Applied Sciences (OJAppS) , 2014, DOI: 10.4236/ojapps.2014.46035
Abstract: The ignored curriculum is one of important elements in the curriculum that the design of this concept has led to reduce a superficial look at measures to curriculum. Ignored curriculum not only in the design but also should be considered at the implementation level. The present study examined the experiences of teachers in general education from ignored curriculum in higher education and this study was done by qualitative research and its approach was interpretive phenomenology. In this regard, semi-structured interviews were conducted with twenty-six teachers of general education courses and the data obtained from these interviews were analyzed by using phenomenology of Smith. Three major themes from ignored curriculum, were found from the experience of teachers including 1) lack of attention to requirements which consists of three sub-categories: in attention to the needs of the learner, the needs and demands of everyday life and the needs of experts; 2) lack of attention to content; 3) run into problems involving the four sub-problems of teaching, evaluation time, space and assessment. The teachers during the training and implementing courses have gained a lot of experience from the ignored curriculum that had impact on their perception. Planners are familiar with academics experiences and identify ignored curriculum of general education courses and emphasized on how they understand the main goals of general education courses and made it meaningful and they had a main role in eliminating the flaws of this course, and enhance the effectiveness of them. In summary, the results obtained from the study were that general education courses, do not address the needs of learners. These requirements include of three sub-categories: inattention to the needs of the learner, routine needs and professionals. Also, courses have less attention to content. And there are problems such as difficulties in teaching this lesson, time, space and evaluation.
Synthesis of pH-Sensitive Hydrogel Based on Starch-Polyacrylate Superabsorbent  [PDF]
Mohammad Sadeghi, Fatemeh Soleimani
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2012, DOI: 10.4236/jbnb.2012.322038
Abstract: In this article, we synthesize of a novel starch-based superabsorbent hydrogel via graft copolymerization of mixtures of acrylic acid (AA) and 2-Hydroxy ethyl methacrylate (HEMA) onto starch backbones. The polymerization reaction was carried out in an aqueous medium and in the presence of ammonium persulfate (APS) as an initiator and N,N’-methylene bisacrylamide (MBA) as a crosslinker. The hydrogel structures were confirmed by FTIR spectroscopy. Furthermore, the swelling of superabsorbing hydrogels was examined in solutions with pH values ranging between 1 and 13. It showed a reversible pH-responsive behavior at pHs 2 and 8. This on-off switching behavior makes the synthesized hydrogels as an excellent candidate for controlled delivery of bioactive agents. A proposed mechanism for hydrogel formation was suggested and the structure of the product was established using FTIR and SEM spectroscopies.
The University of Jordan E-Learning Platform: State, Students’ Acceptance and Challenges  [PDF]
Tamara Almarabeh, Hiba Mohammad, Rana Yousef, Yousef Kh. Majdalawi
Journal of Software Engineering and Applications (JSEA) , 2014, DOI: 10.4236/jsea.2014.712087
Abstract: The rapid changes and increased complexity in today’s world present new challenges and put new demands on the education system. There has been generally a growing awareness of the necessity to change and improve the existing system towards online learning. Jordan is one of the distinguished countries in the Middle East with rapid progress in education and with advanced teaching and learning technologies. The University of Jordan is trying to exploit Information and Communication Technology (ICT) in education and moving forward by introducing the latest E-learning management systems (LMSs) to keep pace of technological revolution in the higher education. It is important to find out the impact of E-learning management system in the University of Jordan, examine the students’ acceptance for this new system and address the challenges facing the students while using the E-learning management system and these are what this paper is trying to do.
Designing secure clustering protocol with the approach of reducing energy consumption in wireless sensor networks
Sanaz Sadeghi,Behrouz Sadeghi
Computer Science , 2013,
Abstract: In recent years, many researchers have focused on wireless sensor networks and their applications. To obtain scalability potential in these networks most of the nodes are categorized as distinct groups named cluster and the node which is selected as cluster head or Aggregation Node offers the operation of data collection from other cluster nodes and aggregation and sending it to the rest of the network. Clustering and data aggregation increase network scalability and cause that limited resources of the network are used well. However, these mechanisms also make several breaches in the network, for example in clustered networks cluster head nodes are considered Desirable and attractive targets for attackers since reaching their information whether by physical attack and node capturing or by other attacks, the attacker can obtain the whole information of corresponding cluster. In this study secure clustering of the nodes are considered with the approach of reducing energy consumption of nodes and a protocol is presented that in addition to satisfying Advanced security needs of wireless sensor networks reduces the amount of energy consumption by the nodes. Due to network clustering there is scalability potential in such a network and According to frequent change of cluster head nodes load distribution is performed in the cluster and eventually increase the network lifetime.
Norm attaining bilinear forms on
Yousef Saleh
International Journal of Mathematics and Mathematical Sciences , 2000, DOI: 10.1155/s0161171200003203
Abstract: Given a finite measure μ, we show that the set of normattaining bilinear forms is dense in the space of all continuousbilinear forms on L1(μ) if and only if μ is purelyatomic.
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