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The Universe is an American documentary television series that features computer-generated imagery and computer graphics of astronomical objects in the universe plus interviews with experts who study in the fields of cosmology, astronomy, and astrophysics. The program was produced by Flight 33 Productions and Workaholic Productions.
There are three common naming conventions for specifying one of the two enantiomers (the absolute configuration) of a given chiral molecule: the R/S system is based on the geometry of the molecule; the (+)- and (−)- system (also written using the obsolete equivalents d- and l-) is based on its optical rotation properties; and the D/L system is based on the molecule's relationship to ...
The following is a list of television programs by episode count. Episode numbers for ongoing daytime dramas are drawn from the websites for the shows. Daily news broadcasts, such as The Today Show, Good Morning America, and SportsCenter, are not episodic in nature and are not listed.
Today (also called The Today Show) is an American morning television show that airs weekdays from 7:00 a.m. to 11:00 a.m. on NBC.The program debuted on January 14, 1952. It was the first of its genre on American television and in the world, and after 72 years of broadcasting it is fifth on the list of longest-running American television serie
[1] [2] With the use of computer-generated imagery (CGI) and visual effects, each episode presents and narrates a topic about the universe (e.g.: the origin of the universe, the formation and the evolution of the Solar System, and the origin and behavior of life), which then are complemented with scientific insights from leading scientists of ...
Also, for artificial compounds, including medicines, in case of chiral drugs, the two enantiomers sometimes show remarkable difference in effect of their biological actions. [29] Darvon (dextropropoxyphene) is a painkiller, whereas its enantiomer, Novrad (levopropoxyphene) is an anti-cough agent.
A racemic mixture is an equal mixture of both enantiomers, which may be easier to manufacture than a single enantiomeric form. Indacrinone Enantiomers. It is often the case that only a single one of the enantiomers contains all of the wanted bioactivity, the distomer is often less active, has no desired activity or may even be toxic. [6]
[24] [25] If the reaction is started with some of one of the product enantiomers already present, the product acts as an enantioselective catalyst for production of more of that same enantiomer. [26] The initial presence of just 0.2 equivalent one enantiomer can lead to up to 93% enantiomeric excess of the product.