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The isostere concept was formulated by Irving Langmuir in 1919, [3] and later modified by Grimm. Hans Erlenmeyer extended the concept to biological systems in 1932. [ 4 ] [ 5 ] [ 6 ] Classical isosteres are defined as being atoms, ions and molecules that had identical outer shells of electrons, This definition has now been broadened to include ...
Silafluofen is an isostere of pyrethroid insecticides. Silafluofen is an organosilicon analogue of pyrethroid insecticide Etofenprox , wherein a carbon center has been replaced by isosteric silicon, and in addition, one hydrogen atom is replaced by isosteric fluorine atom.
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1080p (1920 × 1080 progressively displayed pixels; also known as Full HD or FHD, and BT.709) is a set of HDTV high-definition video modes characterized by 1,920 pixels displayed across the screen horizontally and 1,080 pixels down the screen vertically; [1] the p stands for progressive scan, i.e. non-interlaced.
Progression of the most-viewed video on YouTube Video name Uploader Views at achievement* Publication date Date achieved Days after upload Days held Takedown date Ref Notes "Baby Shark Dance" [7] Pinkfong Baby Shark - Kids' Songs & Stories: 7,046,700,000: June 17, 2016: November 2, 2020 1600 1,575 "Despacito" [10] Luis Fonsi: 2,993,700,000 ...
In organic chemistry, endo–exo isomerism is a special type of stereoisomerism found in organic compounds with a substituent on a bridged ring system. [1] The prefix endo is reserved for the isomer with the substituent located closest, or "syn", to the longest bridge.
Acridine is an organic compound and a nitrogen heterocycle with the formula C 13 H 9 N. Acridines are substituted derivatives of the parent ring. It is a planar molecule that is structurally related to anthracene with one of the central CH groups replaced by nitrogen.
Since June 2007, YouTube's videos have been available for viewing on a range of Apple products. This required YouTube's content to be transcoded into Apple's preferred video standard, H.264, a process that took several months. YouTube videos can be viewed on devices including Apple TV, iPod Touch and the iPhone. [108]