نتایج جستجو برای: 4050 nmm2

تعداد نتایج: 193  

2010
Teddi J. Setzer Robert H. Tykot

The reason for the choice of a specific type of obsidian for tool manufacturing is generally assumed to be related to the location of the source, the appearance of the material, and/or the sociopolitical relationships that may restrict its procurement, rather than the inherent qualities of the type of obsidian. This research examines the use of Monte Arci obsidian (types SA and SC) using macros...

Journal: :Journal of Biological Chemistry 2021

Transmission of Severe Acute Respiratory Syndrome Coronavirus 2 from humans to animals has been reported for many domesticated species, including farmed minks. The identification novel spike gene mutations appearing in minks raised major concerns about potential immune evasion and challenges the global vaccine strategy. One genetic variant, known as “cluster five,” arose among Denmark resulted ...

2016
G. Brown G. Waychunas C. Ponader W. Jackson D. Mckeown G. E. BROWN

X-ray absorption spectroscopic studies of cation environments in oxide glasses are selectively reviewed. New results are presented on K and Yb environments in silicate glasses and on Fe in silicate melts at temperatures up to 1173 " K. INTRODUCTION Recent investigations of oxide glasses and crystalline model compounds by x-ray absorption spectroscopy (XAS and the acronyms EXAFS for extended fin...

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