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Search Results: 1 - 10 of 522 matches for " Marjan Mansourian "
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Association of Nitrate, Nitrite, and Total Organic Carbon (TOC) in Drinking Water and Gastrointestinal Disease
Samaneh Khademikia,Zahra Rafiee,Mohammad Mehdi Amin,Parinaz Poursafa,Marjan Mansourian,Amir Modaberi
Journal of Environmental and Public Health , 2013, DOI: 10.1155/2013/603468
Abstract: Objective. We aimed to investigate the amounts of nitrate, nitrite, and total organic carbon (TOC) in two drinking water sources and their relationship with some gastrointestinal diseases. Methods. This cross-sectional study was conducted in 2012 in Iran. Two wells located in residential areas were selected for sampling and measuring the TOC, nitrate (NO3?), and nitrite (NO2?). This water is used for drinking as well as for industrial and agricultural consumption. Nitrate and nitrite concentrations of water samples were analyzed using DR 5000 spectrophotometer. The information of patients was collected from the records of the main referral hospital of the region for gastrointestinal diseases. Results. In both areas under study, the mean water nitrate and nitrite concentrations were higher in July than in other months. The mean TOC concentrations in areas 1 and 2 were 2.29 ± 0.012 and 2.03 ± 0.309, respectively. Pollutant concentration and gastrointestinal disease did not show any significant relationship . Conclusion. Although we did not document significant association of nitrite, nitrate, and TOC content of water with gastrointestinal diseases, it should be considered that such health hazards may develop over time, and the quality of water content should be controlled to prevent different diseases. 1. Introduction Nitrate is considered as the most prevalent chemical contaminant in the world’s groundwater. Organic and inorganic sources of nitrogen are converted to nitrate. After reducing, nitrate can be biologically transformed to nitrogen gas. The growing contamination of public and private well drinking water by nitrate is mostly because of the widespread use of commercial fertilizers and waste [1]. Groundwater is used for agricultural and industrial consumption as well as for drinking water. Humans have altered the nitrogen cycle dramatically over the last decades, and as a result, nitrate is increasingly accumulating in water resources. Globally, human nitrogen production has increased significantly since 1950 due to the use of nitrogen fertilizers. In agricultural areas, groundwater and private and low depth wells have higher levels of nitrate. Fertilizers are most important contributing factor in agricultural areas; however, nitrogen from human waste seems to be an essential source in urban areas with deficient centralized water and sanitation systems [2]. Nitrate is in solution form and is mobile. It could become spread in groundwater and is one of the most common pollutant and concern for human health. It may have several health hazards.
First growth curves based on the World Health Organization reference in a Nationally-Representative Sample of Pediatric Population in the Middle East and North Africa (MENA): the CASPIAN-III study
Marjan Mansourian, Hamid Marateb, Roya Kelishadi, Mohammad Motlagh, Tahereh Aminaee, Mahnaz Taslimi, Reza Majdzadeh, Ramin Heshmat, Gelayol Ardalan, Parinaz Poursafa
BMC Pediatrics , 2012, DOI: 10.1186/1471-2431-12-149
Abstract: In this nationwide study, the anthropometric data were recorded from Iranian students, aged 10–19?years, who were selected by multistage random cluster sampling from urban and rural areas. Prior to the analysis, outliers were excluded from the features height-for-age and body mass index (BMI)-for-age using the NCHS/WHO cut-offs. The Box-Cox power exponential (BCPE) method was used to calculate height-for-age and BMI-for-age Z-scores for our study participants. Then, children with overweight, obesity, thinness, and severe thinness were identified using the BMI-for-age z-scores. Moreover, stunted children were detected using the height-for-age z-scores. The growth curve of the Iranian children was then generated from the z-scores, smoothed by cubic S-plines.The study population comprised 5430 school students consisting of 2312 (44%) participants aged 10–14?years , and 3118 (58%) with 15–19?years of age. Eight percent of the participants had low BMI (thinness: 6% and severe thinness: 2%), 20% had high BMI (overweight: 14% and obesity: 6%), and 7% were stunted. The prevalence rates of low and high BMI were greater in boys than in girls (P?<?0.001). The mean BMI-for-age, and the average height-for-age of Iranian children aged 10–19?years were lower than the WHO 2007 and United states Centers for Disease Control and Prevention 2000 (USCDC2000) references.The current growth curves generated from a national dataset may be included for establishing WHO global database on children’s growth. Similar to most low-and middle income populations, Iranian children aged 10–19?years are facing a double burden of weight disorders, notably under- and over- nutrition, which should be considered in public health policy-making.Growth curves are used for screening, surveillance and monitoring of children and adolescents’ health; and are cost-effective in detecting nutritional disorders [1]. These references serve as a tool for static and dynamic diagnosis of growth disorders, tracking the g
Serum Paraoxonase 1 Activity Is Associated with Fatty Acid Composition of High Density Lipoprotein
Maryam Boshtam,Amirnader Emami Razavi,Morteza Pourfarzam,Mohsen Ani,Gholam Ali Naderi,Gholam Basati,Marjan Mansourian,Narges Jafari Dinani,Seddigheh Asgary,Soheila Abdi
Disease Markers , 2013, DOI: 10.1155/2013/612035
Abstract: Introduction. Cardioprotective effect of high density lipoprotein (HDL) is, in part, dependent on its related enzyme, paraoxonase 1 (PON1). Fatty acid composition of HDL could affect its size and structure. On the other hand, PON1 activity is directly related to the structure of HDL. This study was designed to investigate the association between serum PON1 activity and fatty acid composition of HDL in healthy men. Methods. One hundred and forty healthy men participated in this research. HDL was separated by sequential ultracentrifugation, and its fatty acid composition was analyzed by gas chromatography. PON1 activity was measured spectrophotometrically using paraxon as substrate. Results. Serum PON1 activity was directly correlated with the amount of stearic acid and dihomo-gamma-linolenic acid (DGLA). PON1/HDL-C was directly correlated with the amount of miristic acid, stearic acid, and DGLA and was inversely correlated with total amount of ω6 fatty acids of HDL. Conclusion. The fatty acid composition of HDL could affect the activity of its associated enzyme, PON1. As dietary fats are the major determinants of serum lipids and lipoprotein composition, consuming some special dietary fatty acids may improve the activity of PON1 and thereby have beneficial effects on health. 1. Introduction Serum paraoxonase 1 (PON1) is a 45?kDa glycoprotein which can catalyze the hydrolysis of various organophosphates and nerve agents [1, 2] and also metabolize some drugs and prodrugs by its lactonase activity [3]. This enzyme which is located on high density lipoprotein (HDL) particles protects low density lipoprotein (LDL) phospholipids against oxidation [4]. Decreased PON1 activity has been addressed in several diseases such as coronary artery diseases (CAD) [5], type I diabetes [6], obesity [7], and renal failure [8]. It is evident that PON1 activity is influenced by a variety of agents like environmental, pharmacological, and lifestyle factors as well as age and sex [2, 5, 9–11]. Dietary fats have been suggested as an important relevant factor [12, 13]. Studies have presented that dietary fatty acids may affect PON1 activity [14]. Polyenoic fatty acids have shown considerable inhibitory effect on PON1 activity [15], while monoenoic acids (especially oleic acid) protect PON1 from oxidative inactivation [16]. It has been also indicated that replacement of dietary saturated fats with trans fats in healthy men and women leads to a small reduction in the serum PON1 activity [17]. Serum PON1 is almost exclusively found in association with HDL particles. The lipid
Book Review: Web Search-Public Searching of the Web
Yazdan Mansourian
Webology , 2004,
Abstract: The book consists of four sections including (1) the context of web search, (2) how people search the web, (3) subjects of web search and (4) conclusion: trends and future directions. The first section includes three chapters addressing a brief but informative introduction about the main involved elements of web search process and web search research including search engines mechanism, human computer interaction in web searching and research design in web search studies.
Editorial Note
Yazdan Mansourian
Webology , 2004,
Abstract: This issue of Webology journal consists of some articles on different aspects of the web search research. In terms of the articles' theme, they can be divided into two main categories. The first category is mainly on reviewing research on search procedure on the web and encompasses Spink and Jansen's article (the first paper) and Asadi and Jamali's work (the third paper). The other category includes Narsesian's article (the second paper) and Safari's article (the fourth paper) which are discussions on some aspects of the web content and web resources organization.
Similarities and differences between Web search procedure and searching in the pre-web information retrieval systems
Yazdan Mansourian
Webology , 2004,
Abstract: This paper presents an introductory discussion about the commonalities and dissimilarities between Web searching procedure and the searching process in the previous online information retrieval systems including classic information retrieval systems and database. The paper attempts to explain which factors make these two groups different, why investigating about the search process on the Web environment is important, how much we know about this procedure and what are the main lines of research in front of the researchers in this area of study and practice. After presenting the major involved factor the paper concludes that although information seeking process on the Web is fairly similar to the pre-web systems in some ways, there are notable differences between them as well. These differences may provide Web searcher and Web researchers with some opportunities and challenges.
The Past, Present and Future of Web Search Research: An Interview with Dr. Amanda Spink
Yazdan Mansourian
Webology , 2005,
Abstract: This is an interview which was carried out at the University of Sheffield on Thursday 14th April 2005. The interview is mainly about the current trends and issues of web search research area and is divided into two parts. In the first section Dr. Spink explains her ideas about the area as a senior researcher who has published many papers and research reports on users' web search behaviours. In the second section Dr. Spink answers a few general questions to explain her views as one of the millions of web users who search this ocean of information everyday.
Chemoinformatics and the World Wide Web: An Interview with Professor Peter Willett
Yazdan Mansourian
Webology , 2006,
Abstract: This report is the direct transcription of an interview with Professor Peter Willett in March 7, 2006 and seeks to illustrate some general issues in chemoinformatics and its linkage with the related areas. Professor Willett is the head of Department of Information Studies at the University of Sheffield and is one of the well-known researchers in information retrieval (IR) in general and chemoinformatics in particular. The interview consists of two parts. The first part is related to Professor Willett's specific research area and its relation to the World Wide Web. In the second part he addresses some general issues about his personal experience of using the Web as an end-user rather than an expert in IR.
Microstrip Ultra-Wideband Filter with Flexible Notch Characteristics  [PDF]
Marjan Mokhtaari, Jens Bornemann
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.31002
Abstract: A microstrip ultra-wideband (UWB) filter with unique shape, compactness, simplicity of operation and flexible notch characteristics is introduced. It is based on the fundamental and harmonic characteristics of a 50 Ohm transmission line that is grounded at both ends. The filter possesses design flexibility in the sense that it can operate as a stand-alone UWB component or include simple additional circuitry to create one or two notches within the ultra-wideband frequency range. The basic design principles are highlighted and verified using the results of two commercially available field solver packages. Individual filter structures with single and double notches are validated through measurements of a number of filter prototypes.
The Comparative Study of Obesity among Mothers with Different Ethnic Groups in Northern IRAN
GR Veghari,AR Mansourian
Iranian Journal of Public Health , 2007,
Abstract: "nBackground: To evaluate the prevalence of obesity and some related factors in the villages around Gorgan which is a multi-racial and capital city of Golestan Province, northern Iran. "nMethods: This was a cross-sectional study with 2854 women participated. Interviewers recorded the data using the question-naire. Subjects were weighed on scales and had their height, waist, and hip circumferences. Economic status was categorized based on 10 consumer items considered necessary for modern-day life (Low >=3, Moderate = 4-6 and Good= 7-10). Three ethnic groups were compared in this study: Fars (native), Turkman and Sistani. This study carried out in rural area of Golestan Province in 2004."nResults: Body Mass Index (BMI) in ranges of (25-29.9), (30-39.9) and (>=40) was observed in 28.3%, 15.9% and 0.5% of the subject, respectively. The frequency of BMI over 25 among Fars(native), Turkman and Sistani mothers was 64.3%, 43.4% and 32.9%, respectively and statistical differences was significant (P< 0.02). In 39.1% of these women, the Waist to Hip Ratio (WHR) exceeded 0.8 and the index was higher in Turkman women compared with other groups. The frequency of economic status was 34.7%, 50.8% and 55.9%, respectively, without any significant difference. The preva-lence of obesity in literate women was significantly higher than in illiterate women (P< 0.04)."nConclusion: Obesity is a common health problem among women in the rural areas of Gorgan and this abnormality is var-ied among three different ethnic groups in this region.
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