نتایج جستجو برای: lack of concentration
تعداد نتایج: 21175937 فیلتر نتایج به سال:
the construct of self-efficacy has received increasing attention in research over the past two decades. many studies have been carried out 1.3 significance of the study this study has pedagogical implications since improving students’ self- efficacy and autonomy is important for promoting actual performance on classroom academic tasks. in academic settings, it has been shown that self-effi...
since a long time ago raisins has been considered as an exporting item iniran, in which only 15-20 percent of raisins are consumed and the remaining is exported at a low price. also, until 20 years ago,iranwas one of the most important exporters of raisins to european and asian countries. unfortunately because of retarded technology, lack of modern agricultural methods and also lack of suitable...
background : the present paper aims to study the effect of human and urban activities on the quality of groundwater within the city of khoy in terms of heavy metals, chemical salts, and minerals from the geological formations of this region. methods : samples were provided from 32 pumping wells and the concentration of heavy metals ( cd, cu, mn, pb, zn, fe, as, and b), the main ions (hco 3 ,so ...
background and objectives: with regard to the hazards of nitrite, application of natural preservatives in order to reduce the microbial load of meat and meat products is increasing. owing to their anti-bacterial properties, red barberry and the dried residue of red grape could be suitable replacers for nitrite. materials and methods: agar dilution method was employed in order to determine the m...
Background: The aim of this study was to use Japanese quail as an animal model to evaluate the effects of cadmium (Cd) on the ultrastructure and the activity of metallothionein (MT) in the liver and kidneys. Methods: One hundred male Japanese quails were randomly divided into two Cd and control groups in 2015. The first group received 100 ppm Cd for 60 days in their feed. The ultrastructural c...
Background and objective: The wastewater discharged from textile industries is one of the main environmental pollutants that causes many problems for the environment if it is not treated or discharged. The present study compared Fenton oxidation process with coagulation and flocculation using the natural coagulant of Sodium Alginate in order to remove Reactive Red 198 Dye. Materials and method...
Introduction: Nowadays, usefult study is considered as an important element in social development and progress through which the public and epecially university students gain a lot. The purpose of this research is to determine factors affecting on useful study among students of Isfahan University of Medical Sciences (IUMS) in 2012. Methods: This is an applied survey research in which the data...
Background: Pre-menstrual Syndrome (PMS), refers to a cyclic appearance of somatic and psychiatric symptoms in some women. Finding an effective and safe solution for the treatment of PMS had been always under consideration.The purpose of the present study is to evaluate of the effect of Omega-3 fatty acids on the treatment of PMS.Methods: A randomized double blind controlled trial was perfo...
Due to the importance of fish consumpotion, their contamination with heavy metals can be a serious threat to food security and public health. In this regard, the aim of this study was investigates the concentration and evaluation of the health hazard of heavy metals) Lead, Chromium, Copper and Zinc( in muscle tissue of Cyprinus carpio and Ctenopharyngodon idella species in Bashar River, Yasuj. ...
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