مزارع برنج از جمله اکوسیستم های خشکی هستند که از شرایط محیطی مناسبی برای رشد و انتشار سیانوباکتری ها برخوردارند. جنس anabaena bory ex bornet et flahault از جمله مهمترین جلبک های سبز-آبی رشته ای دارای هتروسیست در این اکوسیستم های خشکی به شمار می آید. در مطالعه حاضر، ایزوله های مختلف از این جنس، از خاک مزارع برنج 7 استان دارای کشت برنج واقع در مناطق شمالی، جنوبی، شرقی، غربی و مرکزی کشور، از اردیب...

During last three decades, because of rapid influx of population into the cities, many problems have been emerged for cities. Thus, it is necessary to plan and present models in order to regulate urban network to reduce and organize emerging problems. Finding factors resulting from these events, presenting solution in order to reduce unfavorably existing situation, and move toward balance in po...

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abstract the purpose of this study was to find out the effect of applying the principles of group-dynamic assessment (g-da) on learning of conditional structures in english by iranian efl learners at the intermediate level, which according to the formal educational system in iran, includes students who are in their second year of studying in high schools of koohdasht city. this study was a qua...

different researchers in different parts of the world have investigated the strategies used to translate written works ranging from novels to classroom assignments. however, by the significant increase in the number of postgraduate students in iran in the last few years, a very common kind of translation in iran includes translating abstracts of master’s theses. in this work, the researcher hav...