منابع مشابه
the underlying structure of language proficiency and the proficiency level
هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...
15 صفحه اولThe antisickling effects of some edible vegetables
The antisickling effects of the extracts of three vegetables highly consumed in Nigeria were investigated which included: Allium cepa (Onion), Allium sativum (Garlic) and Telferia occidentalis (Ugu). The extracts were partitioned into, the fat-soluble (FAS), the water-soluble (WAS), the butanol-soluble (BUS) and the crude aqueous extracts (CAEs) respectively. Free amino acid concentrations of t...
متن کاملWater: Structure and Properties
Water is a major component of all living things. It is anomalous in many of its physical and chemical properties. Some are essential for life while others have profound effects on the size and shape of living organisms, how they work, and the constraints within which they must operate. Many of water’s basic physical properties can now be explained, at least semiquantitatively, in molecular and ...
متن کاملAntisickling effects of 2,3-diphosphoglycerate depletion.
Elevation of 2,3-bisphosphoglycerate (2,3-DPG) in sickle erthrocytes (SS RBCs) and concomitant acidification of the cell interior promote polymerization by decreasing the solubility (csat) of deoxyhemoglobin S. The antisickling effect of 2,3-DPG depletion was evaluated after activation of the 2,3-DPG phosphatase activity of bisphosphoglycerate mutase by glycolate-2-phosphate, leading to rapid l...
متن کاملPhysiological and x-ray studies of potential antisickling agents.
Several aromatic compounds have been found to inhibit the gelling of sickle cell hemoglobin. We have tried to correlate the antigelling activity of such compounds with the stereo-chemistry of their binding sites in the hemoglobin molecule. This approach led to the discovery that two known antilipoproteinemia drugs, clofibrate and gemfibrozil, have antigelling activity. X-ray analysis showed tha...
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/289637a0