نتایج جستجو برای: s a p
تعداد نتایج: 13796703 فیلتر نتایج به سال:
a simple and reproducible method for the rapid extraction and determination of trace amounts of copper(ii) ions using octadecyl-bonded silica membrane disks modified by 1-(2-pyridyl azo)2-naphtol(pan) and atomic absorption spectrometry was presented. the method was based on complex formation on the surface of the envi-18 disk tm disks followed by stripping of the retained species by minimum amo...
conclusions the current study highlights that the high level of resistance to many antibacterial agents and a gradual increase in the degree of per, oxa-10, shv and tem esbls among the majority of imipenem resistant p. aeruginosa isolated from patients with burn infection is an enormous threat in burn centers in iran. results the results showed that the majority of isolates (88%) were multi-dru...
site-directed mutagenesis (sdm) as a powerful technique was used to change two important and conserved amino acids in 5-enolpyruvylshikimate 3- phosphate synthase (epsps) gene of e. coli. the mutations changed glycine 96 to alanine and alanine 183 to threonine. these two amino acids are very important for intraction of the wide spectrum herbicide, glyphosate, to epsp synthase enzymes. by design...
مقدمه: صنعت جوشکاری یکی از رایجترین صنایع در جهان به حساب میآید و تقریباً بیش از یک درصد نیروی کار هر کشور را جوشکاران تشکیل میدهند. هدف این مطالعه بررسی تغییرات شاخصهای عملکرد ریوی کارگران این صنعت پس از چهار سال جوشکاری میباشد. روش ها: جمعیت مورد مطالعه را تمام جوشکاران یکی از کارخانه های تولید آبگرمـکن شهرستان نیشابور (63 نفر) تشکیل میدهند. اطلاعات دموگرافیک و شکایت های تنفسی کارگرا...
plant growth promoting rhizobacteria and arbuscular mycorrhizal fungi can inhanced plant growth by increasing nutrient uptake. in order to investigate the effect of pgpr and amf on some morphological parameters, macro (nitrogen, phosphorus, potassium, calcium and magnesium) and micro (iron, zinc and copper) nutrients uptake, percentage of root colonization and some morphological factors of pepp...
alzheimer's disease (ad) is a progressive neurodegenerative disease characterized by memory and cognitive dysfunction due to neuronal cell loss in higher brain centers. senile plaques containing amyloid β (aβ) are associated with this disease as well as a reduction in cholinergic neuron numbers. tacrine is a reversible cholinesterase inhibitor in clinical use to treat moderate forms of ad. chit...
مقدمه: کروم یکی از شایع ترین آلاینده هایی است که به دلیل خاصیت تجمعپذیری در بافت های بدن انسان و توانایی ایجاد خطرات بهداشتی در سال های اخیر مورد توجه قرار گرفته است. هدف از این مطالعه مغناطیسی کردن کربن فعال پودری به وسیله نانو ذرات آهن صفر ظرفیتی و استفاده از آن به عنوان جاذب در حذف کروم شش ظرفتی cr (vi) از محیطهای آبی است. روش ها: در این مطالعه آزمایشگاهی از روش احیاء برای تبدیل آه...
glucose-6-phosphate dehydrogenase (g6pd) is a greatly polymorphic enzyme encoded by human x-linked gene. g6pd deficit is the most public enzymopathy in human with about 400 million people affected globally. it is the main controlling enzyme in the hexose monophosphate shunt catalase the oxidation of glucose-6-phosphate to 6-phosphogluconolacton and the creation of reducing equals in the form o...
abstractparkinson’s disease (pd) is a neuropathological and debilitating disorder involving the degeneration of mesencephalic dopaminergic neurons. neuroprotective effect of hesperetin has already been reported, therefore, this study examined whether the administration of this flavonoid would attenuate behavioral abnormalities in an experimental model of pd in rat. for this purpose, unilateral ...
in this work, zncao2 (zinc oxide-calcium oxide) nanocomposite were synthesized at different temperatures (500-700°c) by sol-gel method based on polymeric network of polyvinyl alcohol (pva). the synthesized samples were characterized by sem/edax, ft-ir and xrd techniques. it was found that synthesized nanocomposites have 1.62, 2.05 and 13.91%wt of cao, respectively. the obtained results show tha...
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