نتایج جستجو برای: 222 and 187 tonsha
تعداد نتایج: 16829975 فیلتر نتایج به سال:
زمینه و هدف: رادن یک گاز بی رنگ، بی بو و رادیو اکتیو است که می تواند از سنگ های زینتی مانند گرانیت، مرمر و غیره منتشر گردد. استنشاق گاز رادن در طولانی مدت می تواند باعث بروز سرطان ریه در انسان شود. مواد و روش ها : در این مطالعه مقطعی توصیفی در سه مرحله، غلظت رادن222 و تورن هوای داخلی و زمینه، در 4 انبار نگهداری سنگهای زینتی توسط دستگاه رادن سنج پرتابل 2-1688rtm مورد اندازه گیری قرار گرفت. در مج...
This study investigates the role that financial analysts played in the 1994 restructuring of UAL Corporation (parent of United Air Lines). Under the restructuring employees agreed to $4.9 billion in wage and benefit concessions in exchange for 55% of UAL stock and seats on the board of directors. Although UAL’s shareholders eventually realized huge wealth gains, for almost two years after the t...
RNA interference (RNAi) is the process of sequence-specific post-transcriptional gene silencing triggered by double-stranded RNAs1–3. In attempts to identify RNAi triggers that effectively function at lower concentrations, we found that synthetic RNA duplexes 25–30 nucleotides in length can be up to 100-fold more potent than corresponding conventional 21-mer small interfering RNAs (siRNAs). Som...
Every time people think about what they said (e.g., Was I tactful?), check something they did (e.g., Did I get the correct change?), or decide whether they have finished a task (e.g., Is this note to my daughter clear enough?), they are engaging in metacognition, or thinking about thinking. Metacognition is very important for reading comprehension. This chapter focuses on understanding the role...
Na(+) binding near the primary specificity pocket of thrombin promotes the procoagulant, prothrombotic, and signaling functions of the enzyme. The effect is mediated allosterically by a communication between the Na(+) site and regions involved in substrate recognition. Using a panel of 78 Ala mutants of thrombin, we have mapped the allosteric core of residues that are energetically linked to Na...
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