نتایج جستجو برای: type acid
تعداد نتایج: 1984637 فیلتر نتایج به سال:
a novel acrylic acid-functionalized fe3o4 magnetic nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperacid in chemical transformations. the structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (tem), thermogravimetric analysis (tga), and ft-ir...
Acid-soluble collagen could be isolated from fish skin using acetic acid. In recent years, much attention has been paid to collagen from marine sources, mainly arising from the fact that there is no risk of contagious diseases. Moreover, by processing the fish, significant amounts of waste materials are produced which can be considered as a substitute for these collagen sources. Thunnus tonggol...
Background and Aim: Perturbations in copper (Cu) metabolism are characteristic of diabetes type I. Hyperglycemia and increased free radicals generation result in increased Cu plasma levels and leads to oxidative stress. The aim of this study was to determine the antioxidant effects of ascorbic acid on Cu plasma levels in streptozotocin (STZ) induced diabetic rats. Materials and Methods: ...
Introduction: The aim of this study was to determine the effects of Insulin and Lascorbic acid on prevention of neuronal in granular layer of dentate gyrus and pyramidal layer of CA3 of hippocampus in streptozotocin-Induced diabetic rats. Methods: In this experimental study, diabetes type 1 was included by a single intraperitoneal injection of streptozotocin (STZ) (60mg/kg) in male adult ...
Ellipsoidal huge granitoidic batholiths of Zahedan, with NW-SE trending, located in south of this city which is intruded in low metamorphosed Eocene flysches (eastern Iran flysch zone). This batholith has two compositional terms: an extensive intermediate-acid term includes diorite - granodiorite with igneous source (I- type origin) and a low extent crustal and hybrid origin acidic term (H-type...
Background and Aims: Wild-type RS-12 strain of mumps virus has been isolated from an Iranian patient and has been attenuated after several serial passages. This study was designed to determine nucleotide and amino acid substitutions in the HN, F and SH genes during attenuation of the wild-type virus. Materials and Methods: Required viral samples prepared at Razi Vaccine and Serum Institute. Vi...
در سالهای اخیر تلاش زیادی برای سنتز کمپلکس های سوپرامولکول و پلیمرهای کوئوردیناسیونی بر مبنای لیگاندهای آلی چند دندانه شده است. این مواد به دلیل داشتن خواص منحصر به فرد، کاربردهای زیادی در صنعت دارند. سنتز پلیمرهای کوئوردیناسیونی جدید از سرب(ii) در ابعاد بالک(توده) و نانو با استفاده از روش گرادیان دمایی و به روش شاخه جانبی صورت گرفته و با روش طیف سنجی ir و پایداری گرمایی آن ها توسط آنالیزهای وز...
abstract this study investigates the teachers’ correction of students’ spoken errors of linguistic forms in efl classes, aiming at (a) examining the relationship between the learners’ proficiency level and the provision of corrective feedback types, (b) exploring the extent to which teachers’ use of different corrective feedback types is related to the immediate types of context in which err...
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