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Search Results: 1 - 10 of 167625 matches for " E. Rokni "
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Assessment of HAM and PEM to Find Analytical Solution for Calculating Displacement Functions of Geometrically Nonlinear Prestressed Cable Structures with Concentrated Mass
M. Ghasempour,E. Rokni,A. Kimiaeifar,M. Rahimpour
Journal of Applied Sciences , 2009,
Abstract: In this study, two powerful analytical methods, called He’s Parameter-Expanding Methods (PEM) and Homotopy Analysis Method (HAM) are used to calculating displacement functions of geometrically nonlinear prestressed cable structures. In this study, the results of two methods are compared and it is shown that one term in series expansions is sufficient to obtain a solution by using the PEM. Comparison of the obtained solutions with those obtained using numerical method shows that two methods are effective and convenient for solving this problem. These two methods introduce a capable tool for solving this kind of nonlinear problems.
Antidepressant-like effect of MRI based stimulation in mice
H. Sotoudeh,H. Rokni-Yazdi,E. Sotoudeh,M. Shakiba
Iranian Journal of Radiology , 2005,
Abstract: Introduction & Background: Pieces of evidence sug-gest that a novel type of magnetic resonance imaging (MRI) scan called echo planar magnetic resonance spectroscopic imaging (EP-MRSI) has mood-elevating effects in humans during the depressive phases of bi-polar disorder. We examined whether two protocols of MRI have antidepressant-like effects in mice. Patients & Methods: we examined the effects of stan-dard DWI EPI MRI and T1 MRI on immobility, swimming and climbing time in the standard modi-fied forced swimming test (FST) in three separated groups of Swiss mice. After exposure to first session of modified forced swimming test, one group (group B, n=21) received 15 minutes MRI (T1 proto-col:TR:625ms, TE:9ms, Freq:256, Phase:224, Nex:3, FOV:48) and the other group ( group C, n=21) re-ceived 15 minutes MRI (DWI EPI proto-col:TR:5000ms, TE:103ms, Freq:512, Phase:256, FOV:48). We then compared the mean immobility, swimming, and climbing times in the second session of modified FST between these groups and the con-trol group (group A, n=21) 12 hours later. Results: Groups B and C showed reduced immobility time compared to the control group (p<0.002, p<0.18 respectively). Climbing time in the group undergone DWI EPI MRI protocol was more than the control group (p<0.035), an antidepressant-like effect qualita-tively similar to that of antidepressant drugs affecting the catecholamine systems. Swimming time in T1 MRI group was more than the control group (p<0.037), an antidepressant effect similar to SSRIs. The swimming times, climbing times, and immobility times in the two groups undergone MRI showed no significant difference. Conclusion: MRI stimulation has antidepressant-like effects in mice with probably different mechanisms in the T1 and DWI EPI protocols. Our findings are in accordance with the results in previous studies and raise the possibility that MRI-based stimulations can affect brain biology and therefore might have physi-ologic consequences that may offer novel approaches to the therapy of psychiatric disorders. These conse-quences might render MRI-based scans more invasive than once previously appreciated.
Echinococcosis /hydatidosis in Iran
MB Rokni
Iranian Journal of Parasitology , 2009,
Abstract: "nCystic echinococcosis caused by Echinococcus spp. is considered endemic in Iran. To clarify the pre-sent status of hydatidosis in Iran the present review article is presented. Authentic databases and search engines from 1996 onwards were utilized to enquire the situation of the disease in Iran. Human hydati-dosis is responsible for approximately 1% of admission to surgical wards and the rate of human infec-tion is 0.6-1.2/100000. The usual order of involvement, i.e. liver, lung, and other organs, respectively is documented here as well. Risk factors include contact with dog, eating vegetable, geophagy and con-tact with sheep. Dogs play a critical role in transition the hydatidosis. The rate of infec-tion with E. granulo-sus in stray dogs shows a prevalence of 5% to 49% in different parts of Iran. Followed by sheep with 88% fertilized cysts, camel with 70%, and cattle with 19% have been considered as the most important and the weakest intermediate host of E. granulosus, respectively. Molecular analyses clearly indicate that the camel/dog strain (G6 genotype) of E. granulosus as well as the cosmopolitan, common sheep strain (G1 genotype) occurs in Iran. A wide variety of livestock including sheep, cattle, goat, camel and buffalo also harbor the disease. E. multilocularis another agent of human hydatidosis (alveolar cyst) is reported here as well and from 1946 to 1993, 37 cases of human alveo-lar echinococcosis were reported from northwestern Iran. Hydatidosis must be consid-ered as a dilemma in Iran because of its endemicity in the country.
Evaluation of Enzyme-linked Immunotransfer Blot for the Immunodiagnosis of Human Fascioliasis Using Cysteine Proteinase Antigen
M.B. Rokni,A. Baghernejad,M. Mohebali,E.B. Kia
Pakistan Journal of Biological Sciences , 2006,
Abstract: The present study was targeted as examining sera obtaining from patients infected with Fasciola sp. by the Enzyme-linked Immunotransfer Blot (EITB) technique using the parasite`s Cysteine Proteinase (CE) antigen in order to evaluate the diagnostic potential of the assay. Altogether, a sort of sera including 80 cases of fasciolosis, 80 with other parasitosis other than fasciolosis and 30 normal control sera were enrolled in the trial. Hinge on the collected results, 78 fasciolosis serum samples recognized two antigenic polypeptides of 27 and 29 kDa. The sensitivity, specificity and positive and negative predictive values for CP antigen were 97.5, 98.8, 98.7 and 97.7%, respectively. Utterly, one case of cross-reaction was verified with a toxocariasis case. Concluding remark suggests that the 27 and 29 kDa bands in EITB test could be imperative in the immunodiagnosis of human fascioliasis.
"Evaluation of a Pre-Selected Epitope of Fasciola hepatica Cathepsin- L1 for the Diagnosis of Human Fasciolosis by IgG-ELISA Test."
MB Rokni,MJ Gharavi
Iranian Journal of Public Health , 2002,
Abstract: Coprological analysis is still commonly employed to diagnose human fasciolosis despite the fact that this method is not utterly reliable. By far serologic methods in this case hold more validity and reliability. The purpose of the present study was to evaluate a 35-mer peptide covering a preliminary epitope of Cathepsin L1, a new purified antigen of Fasciola hepatica, by IgG-ELISA method for diagnosis of human fasciolosis. The advantage of this method is that identical batches of a synthetic peptide could be generated immediately without any variation in prepared batches and can be applied to diagnose thousands of infection cases assertively. Totally 90 individuals coprologically positive for fasciolosis and 15 control negative serum samples were included in the test. The cut-off value (O.D.450 nm; 1:1250 serum dilutions) with this peptide was 0.16. Considering this value 27 cases of false negative were detected; hence the calculation of the sensitivity of the IgG-ELISA was identified as 77%. No cases of false positive were spotted. It is concluded that this peptide is not capable to detect antibody in patients’ sera. With reference to other peptides some measurements are being put into operation.
Evaluation of Enzyme- linked Immunosorbaent Assay, Using Somatic and Excretory-Secretory Antigens of Strongyloides stercoralis for the Serodiagnosis of Strongyloidosis
Rokni MB,Kia EB
Iranian Journal of Public Health , 2005,
Abstract: Strongyloidiasis, caused by a nematode parasite so-called Strongyloides stercoralis is one of the major human intestinal nematode infections. Considering that stool examination for Strongyloides larvae is not a sensitive method and immunodiagnostic methods are more applicable for this purpose, so the present study was conducted to compare the somatic (S) and excretory - secretory (ES) antigens of Strongyloides stercoralis in IgG-ELISA to diagnose human strongyloidiasis. Serum samples obtained from 50 individuals infected with Strongyloides stercoralis. Sera from healthy control individuals, not infected with any parasitic diseases (n=/30) and from others with different parasitic infections including hydatidosis (n=20), toxocariosis (n=18), ascariasis (n=2), trichostrongylosis (n=10), and hymenolepiasis (n=2) were examined as well. The cut-off point for (S) and ES was 0.48 and 0.36, respectively. Thirty eight and 42 out of 50 individuals infected with Strongyloides stercoralis were also seropositive using (S) and ES antigens, in that order, whereas 15 cases of false positive reactions for (S) and 10 for ES antigen were detected when non-strongyloidiasis sera were examined, therefore the sensitivity of the test was 80.6% and 86.2% for (S) and ES antigens, respectively. The specificity of those antigens was calculated as 84.2% and 88.2%, correspondingly. It was concluded that overall ES antigen showed a more convincing diagnosis in comparison with (S) antigen, although every interpretation of the results should be in accompany with clinical manifestations and a history of the disease.
A survey on the effects of three surface treatment methods on bond strength between base-metal alloys and Ceromer material (Targis)
Rokni. Sh.,Mehdizade. Sh
Journal of Dental Medicine , 2004,
Abstract: Statement of Problem: Ceramics and resins belong to the earliest tooth restorative materials. Nowadays new generations of these materials have provided a revolution in cosmetic dentistry. Ceramic Optimized polymer (Ceromer) is a newly made product that the bond between this material and base metal alloys, which are used widely today, is paid too much attention. Purpose: The aim of this study was to evaluate the bond strength of targis (Ceromer) to three types of base metal alloys through three different surface treatment methods. Materials and Methods: In this experimental study, ninety plates of Rexillium III, Silver cast and super cast alloys (30 5 0.4) were prepared and surface treated through three different methods (air oxidation, vaccum oxidation and sandblast). All samples were then veneered with 1.mm thickness of Targis. After thermocycling, three-point bending test was performed by universal testing machine (Instron) to evaluate the amount of forces at crack or fracture times in Targis. The type of failure (cohesive or adhesive) was also evaluated microscopically. Statistical analyses were made using 2-factor ANOVA and Duncan tests. Results: The type of surface treatment method caused a statistically significant difference in force rate required for crack and fracture in Targis. Sandblasting was found as the best method. The type of alloys, in all three methods, had a significant effect just on crack creation attributing the largest amount of force to Rexillium III. Adhesive type of failure occurred mostly in super-cast alloys through air-oxidation method, and cohesive type was more among silver cast alloys and sandblast method. Conclusion: According to the results of this study, bond strength between Ceromer materials and base metal alloys is significantly great and Rexillium III alloy associated with sandblast technique the best combination.
"Prevalence of Intestinal Parasites among Children in Day-care Centers in Damghan - Iran"
A Heidari,MB Rokni
Iranian Journal of Public Health , 2003,
Abstract: In order to identify the prevalence of parasitic intestinal infections and to determine the impact of some factors, such as age, health houses, education, environmental health etc, on infection, this survey was carried out on 461 stool specimens and scotch tapes obtained from children resident in day-care centers in Damghan city, Semnan province, Iran. The samples were tested using formalin-ether concentration and Graham methods. The analysis of the results showed that at least 68.1 percent of the individuals tested, were infected with one species of pathogen or non-pathogen parasites. The rate of infection for Enterobius vermicularis, Giardia lamblia, Entamoeba histolytica, Ascaris lumbricoides, Hymenolepis nana, Entamoeba coli, Blastocystis hominis, Iodamoeba butschlii and Chilomastix mesnili was 33.8%, 26.2%, 2.4%, 3%, 4.8%, 5.8%, 4.8%, 2.7% and 4% respectively. A significant difference was seen between the rate of infection and parents’ education (P<0.005) but was negative regarding age, sex, and health houses. It is concluded that sanitary measurements should be conducted in such centers to decrease the rate of parasitic infection.
E-learning in Type 1 Medical Universities of Iran
Mohammad Bagher ROKNI
The Turkish Online Journal of Distance Education , 2005,
Abstract: ABSTRACT Nowadays the Internet is the technological pedestal of organization in the information society and one of the main applications that the Internet offers is the Digital Library (DL). Each society, especially those that claim training of the public, predictably need implementation and endorsement these systems. The time of chalk and board is passed and the globalization and universal village demands a movement targeting to establish an information society. The university is said to be responsible for making "Human". In the era of information explosion, how can a university rely on a physical classroom, a tired teacher and some drowsy students listening to him? Internet "the sweet invention of man" is a bridge, between "slump" and "spurt". It is up to each authority in a university to design, employ, develop and evaluate a system embracing Internet, Multimedia, Network and so on to go parallel in modern era and to introduce the supreme system of E-learning in its program. Of different aspects of E-learning including computer networks, multimedia, search engines, electronic libraries, distance learning, and all that (Piskurich, 2003), most of the type 1 medical universities of Iran exploit, some how or another, all or some of them. These universities including Tehran, Iran, Shahid Beheshti, Mashhad, Isfahan, Tabriz, Shiraz, Ahwaz, and Kerman, at present encompass a powerful link with their audiences regarding digital libraries, search engine and authentic data bases. The present article is going to have a bird's eye view at various capacities of these universities in this regard.
Arab Women Viewpoints with Respect to Their Participation in Social Development in the Society
F. Rokni,A. Poladian
Journal of Applied Sciences , 2009,
Abstract: This study, with particular emphasis on women, investigates the roles of women in lasting social developments and the levels of their participation in various forms, in Bahrain. The outcome of this research study indicates factors affecting women to be more active and progressive or being hindered in their struggles need deliberation The main objective of this research was to study the elements, facilitating or deterring, involved in women participation in social activities from their point of views and by analyzing their viewpoints, deal with their participation in social, cultural and legal activities in their societies. To be able to proceed with the study and research it would be possible to propose the following pivotal questions and seek answers in order to fully understand and appreciate the fundamental elements compelling them to participate in social activities.
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