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Search Results: 1 - 10 of 457 matches for " Dariush Ranjbar Vakilabadi "
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Bacterial Quality of Drinking Water in Bushehr Intercity Buses in 2010
Dariush Ranjbar Vakilabadi,Sina Dobaradaran,Tahereh Kazemi Vakilabady,Rahim Tahmasbi
Journal of Fasa University of Medical Sciences , 2012,
Abstract: Background and Objective: Road transportation and specifically bus travel accounts for the bulk of travel. Contaminated drinking water consumption is one of the issues that threaten health, and always there is pollution possibility in drinking water in buses. This study evaluated the microbial quality of consumed drinking water in buses and also compared it with available standards. Materials and Methods: This study is a cross-sectional study. By considering similar studies, 95% confidence interval and based on the samples size formula for tradition of proportion, 80 buses from 122 buses that entered Bushehr Passenger Depot from other cities or exited it were randomly selected. Over a three-month period, samples were taken from drinking water in these buses. Temperature, pH, residual chlorine, total coliform (TC), and fecal coliform (E. coli) in each sample were measured in accordance with the standard method. Statistical analysis of the data was carried out with SPSS Version 16, and the t-test was performed for statistical difference. Results: The results showed that residual chlorine in 97.5% was zero and pH values of the samples were in the range of 6.8-8.7. TC and E. coli numbers in 12.5% and 8.8% of the samples were higher than those of standards, respectively. Conclusion: Use of ice, washing time of the drinking water tank (daily or weekly), and method of usage and storage of drinking water (with 20-liter tanks) had significant effects on the bacterial loads of the drinking water in the tanks (p value <0.05). Some factors such as tank material, driver's education and age, type and model of the bus, filling time of the tank (daily or weekly), the method of filling and emptying the tank (complete clearing out of the tank or otherwise), and distance had no significant effect on the quality of the drinking water in the buses.
The Correlation of Serum Calcium Level and Obesity; Is There Any Explanation?
Omid Dalfardi,Dariush Jahandideh,Gholam Hossein Ranjbar Omrani
Galen Medical Journal , 2013,
Abstract: Background: Obesity is caused by several factors while sedentary lifestyle and excessive energy intake are the most important ones. Obesity could be due to abnormal calcium metabolism, and a high calcium intake may prevent obesity. Studying serum calcium level, albumin, and triglyceride concentrations, we searched for probable correlation between serum calcium level and anthropometric data of the participants.Materials and Methods: This cross-sectional study was performed in 2011 in Shiraz Endocrine and Metabolism Research Center on 468 participants. Anthropometrics and serum levels of calcium, albumin, and triglyceride levels were measured, recorded, and analyzed by SPSS statistical software.Results: 329 participants were female (70.3%) and the remaining were male (29.7%) with mean age of 46.08 ±15.22 years old. Corrected plasma concentration of calcium based on albumin level had a significant relation with weight, BMI, and triglyceride levels.Conclusion: It is assumed that obesity induces the production of inflammatory cytokines which stimulates bone absorption by osteoclasts that might subsequently lead to a higher serum calcium level in obese people who have a high level of triglyceride at the same time.
A Ranking Method of Extreme Efficient DMUs Using Super-Efficiency Model  [PDF]
Dariush Akbarian
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.11001
Abstract: In this paper, we present a method for ranking extreme efficient decision making units (DMUs) in data envelopment analysis (DEA) models based on measuring distance between them and new PPS (after omission extreme efficient DMUs) along the input-axis or output axis.
Neural and Spinal Modules in Implementation of a Simple Ballistic Movement  [PDF]
Hooshang Hemami, Behzad Dariush
Journal of Software Engineering and Applications (JSEA) , 2016, DOI: 10.4236/jsea.2016.97023
Abstract: A simple ballistic movement and two of its attributes (namely, reversal in time and synchronization with external events) are formulated. A three-dimensional, three-link musculoskeletal arm is subjected to a fast ballistic type movement. The central components of the movement from hippocampal, cerebellar, basal ganglia and reticular formation structures that may be involved in timing are identified. The role of agonist muscles and spinal reflexes in the execution of ballistic movements (namely, in fast starts and fast stops) is discussed. The needed three time intervals are constructed in real time and can be coordinated with external events. Delaying or advancing in time, synchronization, time scaling and inverting events in time relative to the movement is formulated. Digital computer simulations are presented to test the behavior of the formulated neural and spinal processing and demonstrate the behavior of the arm under such control.
Propofol: Attenuating or Inducting of Oxidative Stress?: A Review Article
Akram Ranjbar
Pajouhan Scientific Journal , 2012,
Abstract: A radical (often, but unnecessarily called a free radical) is an atom or group of atoms that have one or more unpaired electrons. A prominent feature of radicals is that they have extremely high chemical reactivity, which explains not only their normal biological activities, but how they inflict damage on cells. The free radical formation in a living system leads to oxidative damage of macromolecules, such as DNA, proteins and lipids. Oxidative stress is defined most simply as the imbalance between the production of free radicals and the body’s antioxidant defense. Propofol (2,6-diisopropylphenol) is a versatile, short-acting, intravenous (i.v.)sedative-hypnotic agent initially marketed as an anesthetic, and now also widely used for the sedation of patients in the intensive care unit (ICU). Propofol's structure contains a phenolic hydroxyl group and thus resembles that of a-tocopherol (vitamin E), a natural antioxidant. As shown by both in vitro and in vivo studies, the antioxidant activity of propofol results partly from this phenolic chemical structure. Propofol has been reported to inhibit lipid peroxidation in various experimental models to protect cells against oxidative stress and to increase the antioxidant capacity of plasma in humans.
A Novel Mathematical/Numerical Formula for Assessing Right Ventricular Torsion Using Echocardiographic Imaging
Saeed Ranjbar
Physics , 2015,
Abstract: Recently, the ventricular torsional parameters have received special attention because of their significant role in the ventricular systolic and diastolic function. Right ventricular (RV) rotational deformation is a sensitive index for RV performance but difficult to measure. Having assumed RV as a conic shape, the present study serves a novel mathematical formula of right ventricular rotation that uses velocity vector imaging (VVI) for quantifying RV.
Fish, Mercury, Selenium and Cardiovascular Risk: Current Evidence and Unanswered Questions
Dariush Mozaffarian
International Journal of Environmental Research and Public Health , 2009, DOI: 10.3390/ijerph6061894
Abstract: Controversy has arisen among the public and in the media regarding the health effects of fish intake in adults. Substantial evidence indicates that fish consumption reduces coronary heart disease mortality, the leading cause of death in developed and most developing nations. Conversely, concerns have grown regarding potential effects of exposure to mercury found in some fish. Seafood species are also rich in selenium, an essential trace element that may protect against both cardiovascular disease and toxic effects of mercury. Such protective effects would have direct implications for recommendations regarding optimal selenium intake and for assessing the potential impact of mercury exposure from fish intake in different populations. Because fish consumption appears to have important health benefits in adults, elucidating the relationships between fish intake, mercury and selenium exposure, and health risk is of considerable scientific and public health relevance. The evidence for health effects of fish consumption in adults is reviewed, focusing on the strength and consistency of evidence and relative magnitudes of effects of omega-3 fatty acids, mercury, and selenium. Given the preponderance of evidence, the focus is on cardiovascular effects, but other potential health effects, as well as potential effects of polychlorinated biphenyls and dioxins in fish, are also briefly reviewed. The relevant current unanswered questions and directions of further research are summarized.
Dariush Parvizpour
Iranian Journal of Public Health , 1978,
Abstract: 968 male workers employed in five vegetable oil refineries were studied to discover the effects of age, length of employment and smoking habit on the prevalence of hypertension. The results obtained indicate that the overall prevalence of hypertension is 6.61% showing a direct relationship to the age. Considering the length of employment only, in the workers aged 50 and above, there is also a direct relation between the length of employment and prevalence of hypertension. Furthermore, the results show that not only smoking causes elevation of blood pressure, but the number of cigarettes smoked per day is also important, i.e. the workers who smoke more have a higher prevalence of abnormal pressure.
Designing webliographies in an effective and simple manner: a step by step process
Dariush Alimohammadi
Webology , 2004,
Abstract: This paper explains web-based information retrieval as one of the main research interests of information professionals during the last decade, and introduces machine-oriented and human-oriented approaches in the designing process of Internet search tools and concerns with the second approach as a basis for the discussion. Then it defines the concept of webliography as a special type human-edited search tools. It is in fact an enumerative list of hypertext links and a gateway to the scientific sources of information on the Net, whether annotated or not. The existence and development of webliographies on the Net are justified based on a brief literature review. 14 phases of webliography production process are also enumerated step by step and a conclusion is provided finally.
Book Review: Global information inequalities: Bridging the information gap
Dariush Alimohammadi
Webology , 2008,
Abstract: Digital divide has been one of the most important issues being discussed among information professionals all over the world during the past decade. Traditionally, political systems, public and private sectors, governmental budgets, educational systems and human resources have had many differences in various territories and this reality has led to an imbalance in the level of access different people have to information sources. Recently, this situation has been affected in different ways by technological waves. The invention of the Internet and the Web, specifically, created both opportunities and threats in terms of people's access to information. Although information poor and information rich could be found in all countries, the majority of information poor are in developing countries and information inequalities is a more serious problem in these countries due to several political, economic, educational and cultural factors.
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