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In toxicology, the median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test duration.
Title 50 of the United States Code outlines the role of War and National Defense in the United States Code. Chapter 1 : Council of National Defense Chapter 2 : Board of Ordnance and Fortification (repealed)
Dihydrogen monoxide is a name for the water molecule, which comprises two hydrogen atoms and one oxygen atom (H 2 O).. The dihydrogen monoxide parody is a parody that involves calling water by its unfamiliar chemical systematic name "dihydrogen monoxide" (DHMO, or the chemical formula H 2 O) and describing some properties of water in a particularly concerning manner — such as the ability to ...
Cadmium oxide was used in black and white television phosphors and in the blue and green phosphors of color television cathode ray tubes. [52] Cadmium sulfide (CdS) is used as a photoconductive surface coating for photocopier drums.
[49] [50] In particular, mail-in voting (which was seeing significantly increased use in states that already offered no-excuse absentee voting) was expanded in many states. [51] [52] In response, incumbent President Donald Trump spent weeks claiming that mail-in voting would allow the election to be rigged against him. [53]
X-ray spectromicroscopy has been used to analyse the reactions of pigments in paintings. For example, in analysing colour degradation in the paintings of van Gogh. [140] Using X-ray for inspection and quality control: the differences in the structures of the die and bond wires reveal the left chip to be counterfeit. [141]
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