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Search Results: 1 - 10 of 199225 matches for " N Keshavarz Mohammadi "
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Share of Nations in 37 International Public Health Journals: An Equity and Diversity Perspective Towards Health Research Capacity Building
N Keshavarz Mohammadi,F Zaree,E de Leeuw,MM Emamjomeh
Iranian Journal of Public Health , 2011,
Abstract: Background: This paper contributes to further exploration of inequity in access to health research capacity development by examining the representation of different nations in international public health journals. It also aims to examine the degree of diversity that exists in these journals.Methods: This study is a descriptive survey. It was done with objective sampling on 37 ISI health journals on October of 2008.The number and nationality of people in different editorial positions of the journals was identified. The second analy-sis involved recalculating the numbers obtained for each nation to the population size of nations per million inhabitants. In order to better compare countries in terms of presence in editorial team of the journals, a ‘public health editor equity gap ratio' (PHEEGR) was developed.Results: Low income countries have occupied none of the leadership positions of chief editor or associate /assistant chief editors and middle income countries at maximum shared less than 5 percent. The PHEEGR gap in access to the different editorial positions between highest to the lowest representation of countries was 16/1 for chief editors, 12/1 for associate editors , 335/1 for editorial boards and 202/1 for associate editorial boards. However, after normalizing the data to the country's population, the gap increased significantly.Conclusion: There is an imbalance and possibly even inequity in the composition of editorial boards and offices of interna-tional health journals that should be paid significant attention. This can contribute to fill the equity gap exists between health in developing and developed countries.
Phenotyping of peripheral memory T cell subsets in cutaneous leishmaniasis
Ali Khamesipour,Mahmoud Nateghi Rostami,Hossein Keshavarz,Akram Miramin Mohammadi
Dermatology and Cosmetic , 2010,
Abstract: "nBackground and Aim: The heterogenous population of memory T lymphocytes is distinguished based on surface markers and effector functions such as cytokine secretion. Recently, two subsets of memory T cells are defined by expression of chemokine receptor CCR7 and CD45RA designating as "central memory" T cells (TCM) and "effector memory" T cells (TEM). The objective of this staudy was to evaluate the phenotype and function of these lymphocytes in healed cases of cutaneous leishmaniasis."n"nMethods: The phenotype of lymphocytes were determined in blood samples of 13 volunteers with history of self healing cutaneous leishmaniasis (HCL) and in 6 healthy controls."n"nResults: No significant difference was found in memory T cell subsets between HCL volunteers and healthy controls using flow cytometry. However, following sorting of different memory subsets, a significantly higher proliferation was seen in cells of HCL volunteers comparing to the control group. A significantly higher IFN-γ response in TEM and a significantly higher IL-2 response in TCM were observed in cell culture of HCL volunteers comparing controls."n"nConclusion: The responses were elicited when the cells were stimulate with SLA in vitro, it is concluded Leishmania-specific TEM and Leishmania-specific TCM subsets exist in HCL volunteers and since the volunteers with history of CL presumed to be protected against reinfection, it seems that both TCM and TEM play role in the protection against Leishmania infection in these individuals.
Anti-Angiogenic Effect of Aqueous Extract of Shallot (Allium ascalonicum) Bulbs in Rat Aorta Ring Model
Hamid Reza Mohammadi Motlagh,Kamran Mansouri,Yadollah Shakiba,Maryam Keshavarz
Cell Journal , 2009,
Abstract: Objective: Angiogenesis is a key process in the promotion of cancer and its metastasis.Many natural health products inhibit angiogenesis. Because of the lack of molecular studieson anti-tumor and anti-angiogenic effects of shallot (Allium ascalonicum); except a few clinicalstudies on other shallot properties, such as the anti-proliferative effect of shallot chloroformicextract on two tumor cell lines, the present study focuses on the anti-angiogenic effect ofaqueous shallot extract using an aorta ring model.Materials and Methods: Aortic rings were obtained by cross-sectioning, at 1-2 mm intervals,the thoracic aorta of 4-8 weeks old Wistar male rats and cultured them in a thin drop oftype I collagen gel. After 3 days of culturing and first sprouting, the extract of A. ascalonicum(from 25 to 800 μg/ml) was added to cultures. The results of anti-angiogenic activity wereinvestigated by microscope. The cytotoxicity of extract at different doses on HUVECs wasmeasured by trypan blue assay.Results: The results showed that the shallot extract has suitable anti-angiogenic effect in arange of 50 to 800 μg/ml, but in 25 μg/ml, the extract has no considerable effect. In addition,a tangible cytotoxic effect on endothelial cells at the above mentioned doses was observed.Conclusion: Our study showed that aqueous extract of A. ascalonicum bulbs has noticeableanti-angiogenic activity without toxic effect on the cells in doses that ranged from 50-800 μg/ml. Therefore, A. ascalonicum can be a potential candidate for further investigations used inangiogenesis-related pathologic conditions.
Hand-Made, Three-Dimensional Molecular Model for Active Inorganic Chemistry Learning  [PDF]
Elahe Keshavarz
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.97086
Abstract: The use of molecular model in education has demonstrated its importance due to its positive impact on the teaching and learning process. It is obvious that hand-made tools have considerable importance in science education. This?study suggests for employing three-dimensional molecular model in teaching and appraising chemistry skills and knowledge in high schools and universities. This paper presents three molecular models for unit cells of cubic system.
Complexity Science: New Emerging Approach for Health Professionals
N Keshavarz,I Huges,F Khavarpour
Iranian Journal of Public Health , 2005,
Abstract: Complexity science is about complex adaptive systems (CAS) and provides important concepts and tools for responding to challenge of health care in 21st century and as Holland describes, it is the science of 21st century. In this presentation, I will discuss some of the potential advantages of applying complexity science in my research in school health promotion. Complexity science originates from systems thinking and has been applied in biology, behaviour science, management, business, computer science and mathematics, physics and more recently, in health care. There are few reports about application of this theory in health but they look promising or at least challenging. A CAS is a collection of autonomous, interactive, and adaptive agents that act freely in diverse ways, which are unpredictable and, non-linear but interconnected. It is an ever-changing system, typically with fuzzy boundaries, built of multi-layer nested systems. The evolution of one system influences and influenced by that of other systems. Organisms such as human beings and organizations like health care organizations are good examples of these systems having Variation and non-linear pattern of cause and effect, interactions and change as concepts of CAS. One of the key benefits of the complex adaptive system approach is that it helps you see yourself in the context of a population of agents and helps you see your actions in the context of a population of strategies. In designing my research, I am able to choose from among a range of strategies, otherwise called research methods. I selected semi-structured interviews, participant observation and document analysis. I am interviewing, I meet and interact with teachers who are autonomous agents who make choices what strategies in a context of departmental and school policies described in documents.
The Comparison Of Vitamin C And WBC In Asthmatic And Normal Person
Bogaee N. Shidfar F. keshavarz S A
Tehran University Medical Journal , 2004,
Abstract: Background: Vitamin C is a major antioxidant in lung airways and also functions against external insulting oxidant sources such as smoke and environmental contaminants. The aim of study was to assess the vitamin C in asthmatic patients, by it’s measurement in plasma and white blood cells (WBC). Materials and Methods: In a case–control study 50 asthmatic patients and 50 healthy person were randomly selected. The data were obtained by utilizing socioeconomic questionnaire and 24 hour dietary recall. l0 c.c blood samples were drawn. Plasma and WBC vitamin C concentration were measured colorimetrically. The data were analyzed by FPI and SPSS software. Results: The results indicate that 38 percent and 92 percent of patients had deficient plasma and WBC vitamin C concentrations respectively. There was a significant difference in plasma and WBC vitamin C concentrations among patients and control group (P<0.0001) Analysis of regression showed that a significant dependence was observed between the duration of asthma and plasma vitamin C status (P=0.03), though a positive significant correlation was obtained between plasma vitamin C status and dietary vitamin C intake (P=0.0001, r =0.56), The interaction of socioeconomic parameters and vitamin C concentration in asthmatic patients in this study was not significant . Conclusion: Present study indicates that while there is an association between vitamin C status and asthma but WBC vitamin C status is more sensitive in this regard and deserves further study and consideration.
Melatonin Effects in Methylphenidate Treated Children with Attention Deficit Hyperactivity Disorder: A Randomized Double Blind Clinical Trial
Mohammad Reza Mohammadi,Seyed Ali Mostafavi,Seyed Ali Keshavarz,Mohammad Reza Eshraghian
Iranian Journal of Psychiatry , 2012,
Abstract: Objective: The aim of this study was to determine melatonin effects on sleep patterns, symptoms of hyperactivity and attention deficiency in children with attention-deficit hyperactivity disorder (ADHD).Methods: Children with age range of 7-12 years who had a combined form of ADHD were randomly divided in to 2 groups according to gender blocks. One group took melatonin (3 or 6mg) combined with methylphenidate (Ritalin) (1mg/kg), and the other group took placebo combined with methylphenidate (1mg/kg). ADHD rating scale and sleep patterns questionnaires were completed. Research hypotheses were assessed at the baseline, the second, fourth and eighth weeks after the treatment.Results: The mean sleep latency and total sleep disturbance scores were reduced in melatonin group, while the scores increased in the placebo group (p≥0.05). Data analysis, using ANOVA with repeated measures, did not show any statistically significant differences between the two groups in ADHD scores.Conclusion: Administration of melatonin along with methylphenidate can partially improve symptoms of sleep disturbance. However, it does not seem to reduce attention deficiency and hyperactivity behavior of children with ADHD.
An evaluation of Microleakage of Posterior Composites
Yasini E,Mohammadi N
Journal of Dental Medicine , 1999,
Abstract: Polymerization contraction may produce defects in the composite - tooth bond. This may lead to bond failure and microleakage. The aim of this study was to reduce microleakage of posterior composites using different methods. 45 molar and premolars extracted teeth were choosen. The cavities were randomly assigned into 5 groups of 9. Box-shaped cavities were prepared on each side of proximal surfaces and restored by five different methods. Group 1 was filled by a light-cured composite and dentin bonding agents (DBAs) with light curing from the occlusal area. Group 2 was filled by a light-cured {LC} composite and DBA, in addition the angle between the light source and occlusal area was 45 degree. After conditioning of teeth in-group 3, LC glass ionomer was placed on the gingival floor and then filled by a light-cured composite and DBA. In group 4, after conditioning, the teeth were lined by a LC glass ionomer and then self-cured composite was placed on gingival floor. This group was filled with LC composite. In Group 5 DBA was used followed by placing a self-curing composite on gingival floor and filled by LC composite. The teeth were subjected to 500 thermocycling (5°C and 55°C with dowel time 30 s) and stored in 0.5% basic fushin for 24 hours. Dye penetration was evaluated by light microscope. The results were tested by Kruskat-Wallis one-way analysis of variance by rank. The comparison between treatment groups showed highly significant difference {P<0.0001). No significant difference was found between groups 3 versus 4 and groups 1,2,5 versus 3,4. Group 3 showed the least microleakage score. Therefore least microleakage was obtained by the group which used L C glass ionomer and DBA followed by filling a composite.
An Evaluation on the Effects of Flowable or Condensable Composites Application on Microleakage
E Yasini,N Mohammadi
Journal of Dental Medicine , 2002,
Abstract: Posterior composite restorations, due to polymerization contraction, result in microleakage. Different methods have presented to reduce this phenomena. The aim of this study is to evaluate the effects of flowable and condensable composites to reduce microleakage. Seventy extracted human teeth were prepared with proximal class II cavities with gingival margin 1 mm below CEJ. The teeth randomly were divided into 7 groups. Groups I & II were restored with a dentin bonding (DB) agent plus a Prodigy condensable (Kerr Co.) composite, placing incremental or bulky, respectively.. In groups IK IV, V a dentin bonding agent was applied and then cavities were restored with Tetric flow composite resin as a base plus either a hybrid composite (Tetric ceram, Vivadent Co.) or a Prodigy condensable composite (Cond), placing bulky or incremental. Groups VI and VII were restored with a resin modified glass ionomer (GI) (Fuji II Lc Co.) as a base plus either Prodigy condensable or Tetric ceram. Restorations were polished, thermocycled, and immersed in 0.3% basic fushin. After that samples were sectioned and studied under a stereomicroscope to evaluate dye penetration. Results showed that all restorations showed some degree of microleakage and according to kruskall- wallis statistical analysis, there were not any significant differences between all groups (P-0.051). Then fore pair comparison, between groups. Mann-Whitney analysis was used and no statistical difference was observed. However. Gh DB- Tetric group showed the least microleakage and DB+ Cond (bulk) the most one. Due to lack of an" statistical difference among different materials methods, it is concluded that no method or restorative material have been able to eliminate microleakage in margins completely yet, and using a flowable composite resin, in place of resin modified glass ionomer or using a condensable composite, instead of conventional In brid composites, do not have any effect on microleakage reduction.
Virtual Water Trade as a Strategy to Water Resource Management in Iran  [PDF]
F. Mohammadi-Kanigolzar, J. Daneshvar Ameri, N. Motee
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.62019
Abstract:

Agriculture has historically played a central role in the economy, life and culture of the Iranian population. Nowadays, this sector is facing the reality that its natural fresh water resources become fully utilized. Considering the climate conditions and limitation of using new water resources and the necessity of increasing agricultural product as a result of population growth, there is a general doubt about Iran’s ability to maintain this level of production amid the mounting water challenges, among other obstacles. Therefore, the evaluation of virtual water and water footprint can provide new indicators for informing water policy decisions. So, in order to study the situation at the national level, we estimated virtual water consumption in term of virtual water theory as well water footprint in agriculture sector of Iran. Data from 2001-2008 were used to account for yearly. The results of this study show that Iran has water import dependency and also net water import is 12.7 billion m3 averages. So Iran country saved 12.7 billion m3 from their domestic water resource for utilization in other sectors. Finally, it should be concluded that virtual water trade as a policy measure to water resources management will be provided to a great extent in order to reach both significant water saving and environmental sustainability.

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