نتایج جستجو برای: 137
تعداد نتایج: 13875 فیلتر نتایج به سال:
On March 11, 2011 (hereafter 3.11), a magnitude nine earthquake hit the northeast part of Japan’s main island. The earthquake and subsequent tsunami damaged the cooling systems of the Fukushima No. 1 plant’s reactors operated by Tokyo Electric Company (TEPCO). Ranked seven (the most severe) on a seven-step scale by the International Atomic Energy Agency, comparable to the Chernobyl accident in ...
Air kerma calibration coefficients for a reference class ionization chamber from narrow x-ray spectra and cesium 137 gamma-ray beams were compared between the National Institute of Standards and Technology (NIST) and the Kenya Bureau of Standards (KEBS). A NIST reference-class transfer ionization chamber was calibrated by each laboratory in terms of the quantity air kerma in four x-ray referenc...
BACKGROUND The old Treatment Planning Systems (TPSs) used for intracavitary brachytherapy with Cs-137 Selectron source utilize traditional dose calculation methods, considering each source as a point source. Using such methods introduces significant errors in dose estimation. As of 1995, TG-43 is used as the main dose calculation formalism in treatment TPSs. OBJECTIVES The purpose of this stu...
Following Japan's 2011 Fukushima nuclear incident, voluntary participation, rather than mandatory, was adopted as the default scenario for individual radiation monitoring. We evaluated the representativeness of the internal monitoring results from voluntary participants in Minamisoma City, which is located 10-40 km from the Fukushima nuclear plant. Of approximately 70,000 individuals who were r...
miR-137 plays critical roles in the nervous system and tumor development; an increase in its expression is required for neuronal differentiation while its reduction is implicated in gliomagenesis. To evaluate the potential of miR-137 in glioblastoma therapy, we conducted genome-wide target mapping in glioblastoma cells by measuring the level of association between PABP and mRNAs in cells transf...
به‌منظور بررسی تغییرپذیری محتوای سزیم-137 در سایت مرجع شهرستان فریدن و ارتباط آن با برخی ویژگیهای خاک، تعداد 96 نمونه از اعماق 15-0 و 30-15 سانتیمتری و هم‌چنین برای تعیین توزیع عمودی آن، 8 نمونه خاک از دو پروفیل مرجع از اعماق 5-0، 15-5، 25-15 و 35-25 سانتیمتری برداشته شد. دستگاه اسپکترومتری اشعه گاما برای آنالیز سزیم-137 مورد استفاده قرار گرفت. مقادیر پذیرفتاری مغناطیسی در دو فرکانس 46/0 و 6...
کاهش قابل توجه عملکرد حوزه‌های آبخیز ایران به دلیل حجم زیاد فرسایش، بیانگر ضرورت روزافزون پایش و پیگیری این پدیده مخرب است. در این مسیر، بکارگیری روش‌های نو و دانش روز از اهمیت زیادی برخوردار است. در سرتاسر جهان برای برآورد فرسایش خاک از روش‌ها و مدل‌های فرسایشی به‌ویژه سزیم 137 و RUSLE-3D استفاده می‌شود. در این پژوهش با توجه به اهمیت نهشته‌های لسی از نظر حاصلخیزی و حساسیت بالا به فرسایش، انداز...
Substrate inhibition is a characteristic feature of many cytosolic sulfotransferases. The differences between the complex structures of SULT2A1/DHEA and SULT2A1/PAP or SULT2A1/ADT (Protein Data Bank codes are 1J99, 1EFH, and 1OV4, respectively) have enabled us to elucidate the specific amino acids responsible for substrate inhibition. Based on the structural analyses, substitution of the smalle...
To compare the diarrheagenic Escherichia coli (DEC) identifications obtained between traditional O serotyping and modern virulence gene detection assays, we developed a multiplex real-time PCR assay by detecting six specific virulence genes for enteropathogenic E. coli (EPEC), enterohemorrhagic E. coli (EHEC), enterotoxigenic E. coli (ETEC), and enteroinvasive E. coli (EIEC). Among 261 clinical...
The maturation of young neurons is regulated by complex mechanisms and dysregulation of this process is frequently found in neurodevepmental disorders. MicroRNAs have been implicated in several steps of neuronal maturation including dendritic and axonal growth, spine development, and synaptogenesis. We demonstrate that one brain-enriched microRNA, miR-137, has a significant role in regulating n...
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