نتایج جستجو برای: stereoisomeric group
تعداد نتایج: 979523 فیلتر نتایج به سال:
this thesis attempts to measure learning styles, self efficacy and intrinsic motivation as predictors of iranian ielts reading comprehension. in order to address this issue, a quantitative study was conducted on some randomly selected intact students at ferdowsi university. these two groups were assigned as they were undergraduate (ba=91) and graduate (ma =74) students; they were all aged betwe...
Analysis often reveals variability in the composition of ecstasy pills from pure 3,4-methylenedioxymethamphetamine (MDMA) to mixtures of MDMA derivatives, amphetamine, and other unidentified substances. For a comprehensive toxicological analysis one needs to know all steps to MDMA synthesis which may originate impurities. The aim of this study was to synthesise and determine the chemical-physic...
abstract the present study was conducted to investigate the effect of using model essays on the development of writing proficiency of iranian pre-intermediate efl learners. to fulfill the purpose of the study, 55 pre- intermediate learners of parsa language institute were chosen by means of administering proficiency test. based on the results of the pretest, two matched groups, one as the expe...
this study aimed to investigate the effects of listening strategy training on iranian efl learners listening comprehension and use of such strategies. this work, employing an experimental methodology, was conducted among 60 adult efl learners from a language institute in isfahan, iran, as participants. the participants, who were selected based on the results of a placement test, were assigned t...
Acid hydrolysis has long been used to free the urinary 17-ketosteroids from the water-soluble combinations in which they are excreted. Both hydrochloric acid (13,5,11) and sulfuric acid (15)’ have been employed, for this purpose. The acid treatment, while effecting relatively complete hydrolysis, may also result in destruction (13, 5, 6,3, IS), chlorine substitution (2), dehydration (20,4, 12),...
1,31,4-@-~-Glucan 4-glucanohydrolases (EC 3.2.1.73) from Bacillus subtilis and barley (Hordeum vulgare) with identical substrate specificities but unrelated primary structures have been probed with (R,S)epoxyalkyl (-propyl, -butyl, -pentyl) 8-cellobiosides and with optically pure (3s)and (3R)-3,4-cellobiosides as active site-directed inhibitors. The optimal aglycon length for inactivation diff...
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