نتایج جستجو برای: r12
تعداد نتایج: 486 فیلتر نتایج به سال:
Chronic sleep restriction (CSR) induces neurobehavioral deficits in young and healthy people with a morning failure of sustained attention process. Testing both the kinetic of failure and recovery of different cognitive processes (i.e., attention, executive) under CSR and their potential links with subject's capacities (stay awake, baseline performance, age) and with some biological markers of ...
مقدمه: ریزوبیوم ها باکتری هایی هستند که با گیاهان زراعی خانوادۀ لگوم همزیستی دارند. باکتری های ریزوبیومی علاوه بر تثبیت نیتروژن، قابلیت های دیگری از جمله توانایی تولید آمینو سیکلوپروپان کربوکسیلات دآمیناز (acc دآمیناز[i]) و سیدروفور را دارند، در ایجاد گرهک های بیشتر در شرایط مختلف محیطی موفق تر خواهند بود. هدف از این مطالعه، غربال سویه های رایزوبیومی بومی تولیدکنندۀ آنزیم acc دآمیناز و سیدروفور...
An essential component of mammalian cells, cholesterol exerts significant influence on the physical properties of the cell membrane and in turn its constituents, including membrane proteins. Although sparse, polar amino acid residues are highly conserved in membrane proteins and play pivotal roles in determining specific structural and functional properties. To improve our understanding of part...
This study documents the presence of local protectionism and quantifies its impacts on market competition social welfare in context China’s automobile market. A salient feature auto is that vehicle models by joint ventures state-owned enterprises command much higher shares their headquarter provinces than at national level. Through county border analysis, falsification tests, a consumer survey,...
By using twist construction, we obtain a quantum groupoid D⊗qUqg for any simple Lie algebra g. The underlying Hopf algebroid structure encodes all the information of the corresponding elliptic quantum group-the quasi-Hopf algebras as obtained by Fronsdal, Arnaudon et. al. and Jimbo et. al.. Groupöıdes quantiques associés à des R-matrices dynamiques universelles Résumé En utlisant une constructi...
We give a survey of Beilinson’s conjectures about special values of Lfunctions, with emphasis on the underlying philosophy of mixed motives and motivic cohomology. Introduction. In his seminal paper [1], A.A. Beilinson formulated far reaching conjectures about values of motivic L-functions at integers, and produced a compelling body of evidence in their favour by making ingenious calculations i...
This study investigates the short-run impact of COVID-19 pandemic on number domestic overnight stays at regional level in summer season 2020. Official data for 65 regions four countries are used analysis (Austria, Czech Republic, Germany and Switzerland). Dynamic panel models employed to estimate a tourism demand equation (real GDP price fluctuations) augmented by average temperatures. Estimati...
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