نتایج جستجو برای: h11
تعداد نتایج: 590 فیلتر نتایج به سال:
در این مقاله با استفاده از داده های سری زمانی مربوط به سالهای 2010-1980 که از منابع مختلف جمع آوری شده اند و با به کارگیری روش سیستمی برآوردگر حداقل مربعات معمولی (روش ols)، تحت نرم افزار Eviews به تخمین تابع تقاضای نفت خام برای ایران پرداخته ایم، سپس با استفاده از ضرایب بدست آمده در تابع تقاضا و با توجه به مقادیر پیش بینی شده برای متغیرهای مربوطه تا سال 2015 و نیز تولید نفت خام پیش بینی شده در...
A total of 514 Shiga toxin-producing Escherichia coli (STEC) isolates from diarrheic and healthy cattle in Spain were characterized in this study. PCR showed that 101 (20%) isolates carried stx(1) genes, 278 (54%) possessed stx(2) genes, and 135 (26%) possessed both stx(1) and stx(2). Enterohemolysin (ehxA) and intimin (eae) virulence genes were detected in 326 (63%) and in 151 (29%) of the iso...
Avian influenza virus (AIV) surveillance in Antarctica during 2013 revealed the prevalence of evolutionarily distinct influenza viruses of the H11N2 subtype in Adélie penguins. Here we present results from the continued surveillance of AIV on the Antarctic Peninsula during 2014 and 2015. In addition to the continued detection of H11 subtype viruses in a snowy sheathbill during 2014, we isolated...
New KrAr ages based on ArrAr incremental heating of -2and 2–20-mm size fractions of the well-characterized, carbonate-bearing Heinrich layers of core V28-82 in the eastern North Atlantic are 846–1049 Ma, overlapping with conventional KrAr ages from the same Heinrich layers on the Dreizack seamounts of 844–1074 Ma. This agreement suggests the equivalence of the methods in fine-grained terrigenou...
Phoslactomycins (PLMs) A–F, produced by actinomycetes are polyketide-type antibiotics derived from a hydroxycyclohexanecarboxylic acid or a cyclohexanecarboxylic acid starter unit. Feeding experiments with [2-C]shikimic acid indicated that the C-18 carbon of PLMs comes from C-5 of shikimate. Further feeding studies of cis and trans-3-hydroxy[7-C]cyclohexanecarboxylic acid, [7-C]and [H11]cyclohe...
Periodic elections are the main instrument through which voters can hold politicians accountable. From this perspective term limits, which restrict voters’ ability to reward politicians with re-election, appear counterproductive. We show that despite the disciplining effect of elections, term limits can be ex ante welfare improving from the perspective of voters. By reducing the value of holdin...
From the literature on decentralization, it appears that the scal vertical imbalance is somehow inherent to multi-level governments. Using a stylized model we show that this leads to a reduction in the extent of redistributive scal policies if the maximal tolerable size of government has been reached. To test for this empirically we use some high quality data, from the LIS dataset, on individ...
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