in the present work, a simple and sensitive method was developed for determination of morphine and heroin using gold nanoparticles as resonance rayleigh scattering (rrs) and colorimetric technique’s probe. synthesized gold nanoparticles by sodium citrate reduction method have a negative charge layer on their surfaces because of self-assembled citrate anions on their surface. binding of morphin...

Abstract Background and Objectives Human T-cell lymphotropic virus type I (HTLV-I) has been associated with two diseases in humans such as adult T-cell leukemia/lymphoma (ATLL) and HTLV-associated myelopathy/tropical spastic Para paresis (HAM/TSP). About 5 to 10 million people are infected with HTLV-1 worldwide. In order to improve the blood safety and to prevent false positive results in bloo...

this thesis attempts to investigate the effects of prelistening activities on enhancing iranian efl learners` listening comprehension. the present study investigated ways in which learners` background knowledge could be activated in order to enhance their l2 listening comprehension by limiting the number of possible text interpretations prior to listening. the experiments conducted in this stud...

the present study was conducted to investigate the role of summary in teaching grammar process on pre-university students. to this end, 48 male pre-university students in semnan were participants. they were math class that we called experimental group and science class as control group. in order to make sure there was no significant difference in proficiency level of two groups. a pre-test wa...

Background & Aims: Salmonella enterica is a zoonotic pathogen causing typhoid fever in humans and animals. It is an important cause of food borne infections in humans throughout the world. A recent study estimated approximately 22 million cases of typhoid each year with at least 200,000 deaths. FliC encoding flagellin plays a role in pathogenesis and is an important antigen in vaccination....

Background: Antimicrobial peptides have been considered as the key to change in the current antibiotics. AcAMP, Antimicrobial peptide is one of them, which has been purified from the Aspergillus clavatus ES1 fungus, and its biochemical properties and characterization indicate that this peptide has unique properties. The aim of this study was to express the gene of AcAMP peptide in Escherichia c...

Cucumber cultivars, grown in greenhouse in the Jiroft region, were surveyed for the relative incidence of Zucchini yellow mosaic virus (ZYMV), Watermelon mosaic virus-2 (WMV-2), Cucumber mosaic virus (CMV) and Tomato spotted wilt virus (TSWV) from 2001 to 2004. Samples from 1294 plants representing different cultivars were analysed by Enzyme-linked immunosorbent assay (ELISA) and Dot immunobi...

Cucumber cultivars, grown in greenhouse in the Jiroft region, were surveyed for the relative incidence of Zucchini yellow mosaic virus (ZYMV), Watermelon mosaic virus-2 (WMV-2), Cucumber mosaic virus (CMV) and Tomato spotted wilt virus (TSWV) from 2001 to 2004. Samples from 1294 plants representing different cultivars were analysed by Enzyme-linked immunosorbent assay (ELISA) and Dot immunobind...

the effect of learning strategies on the speaking ability of iranian students in the context of language institutes abstract language learning strategies are of the most important factors that help language learners to learn a foreign language and how they can deal with the four language skills specifically speaking skill effectively. acknowledging the great impact of learning strategies...