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Three variants of obelus glyphs. The dagger symbol originated from a variant of the obelus, originally depicted by a plain line − or a line with one or two dots ÷. [7] It represented an iron roasting spit, a dart, or the sharp end of a javelin, [8] symbolizing the skewering or cutting out of dubious matter.
Tin-117 has a cross section of 2.3 barns, one order of magnitude smaller, while tin-119 has a slightly smaller cross section of 2.2 barns. [30] Before these cross sections were well known, it was proposed to use tin-lead solder as a coolant for fast reactors because of its low melting point.
Phosphates may contain sulfur in place of one or more oxygen atoms (thiophosphates and organothiophosphates). Orthophosphates are especially important among the various phosphates because of their key roles in biochemistry , biogeochemistry , and ecology , and their economic importance for agriculture and industry. [ 2 ]
Following the example above, if one had a composite material made up of α and β phases under isostress conditions as shown in the figure to the right, the composition Young's modulus would be: = / (+) The isostrain condition implies that under an applied load, both phases experience the same strain but will feel different stress ...
Its main figures were Bomis CEO Jimmy Wales and Larry Sanger, editor-in-chief for Nupedia and later Wikipedia. [1] [21] Nupedia was initially licensed under its own Nupedia Open Content License, but before Wikipedia was founded, Nupedia switched to the GNU Free Documentation License at the urging of Richard Stallman.
Each green octahedron consists of one Cr atom in the center and six oxygen atoms (red balls) at the corners. Electron micrograph of a MIL-101 crystal showing its supertetrahedra Metal–organic frameworks ( MOFs ) are a class of porous polymers consisting of metal clusters (also known as Secondary Building Units - SBUs) coordinated to organic ...
The successful incorporation of a third base pair is a significant breakthrough toward the goal of greatly expanding the number of amino acids which can be encoded by DNA, from the existing 20 amino acids to a theoretically possible 172, thereby expanding the potential for living organisms to produce novel proteins. [17]
Worldwide consumption in 2019 was equal to 5.5 litres of pure alcohol consumed per person aged 15 years or older. [6] This is a decrease from the 5.7 litres in 2010.