one of the problems of learners that often impairs learning a second language is syntactic errors. therefore, the present study investigates the syntactic errors of arab speakers learning persian. this research is based on contrastive analysis approach. in this article, interlingual syntactic errors committed in learner’s writings are studied, using field method and through a content analysis o...

the persian morpheme ra has attracted the attention of many linguists including karimi (1989), dabir-moghaddam (1990) and ghomeshi (1996) among others. karimi takes ra as the accusative case marker, the presence of which on subjects and objects of prepositions render the sentence ungrammatical. according to ghomeshi (1996), it marks dps functioning as vp-level topics. dabir-moghaddam (1990) ana...

Background: Successful IVF process is limited by factors such as oocyte quality. Oocyte quality can be defined as its abilities to be fertilized, mature and give rise to normal offspring and it is dependent on nuclear maturation and cytoplasm maturation. Damage to mitochondrial DNA (mtDNA) has been described in oocytes in IVF failure women that decrease cytoplasmic quality because Mitochondria ...

a 9 bp deletion between cytochrome oxidase subunit ii and trna lys genes in mitochondrial dna, has proven to be an extremely informative marker for tracing population history. using the pcr-page and pcr-sscp techniques in this study, 152 dna samples collected from iranian populations were screened for the 9 bp deletion. no deletion was observed. a length polymorphism, most probably a 9 bp tripl...

background: creation of artificial gametes may provide a universal solution for these patients of lacking gametes. stem cell technology may provide a way to obtain fully functional gametes. retinoic acid (ra) can initiate meiosis. several studies have demonstrated that ra can promote sperm cells differentiation from mouse embryonic stem cells (mescs) and other cells from human embryonic stem ce...