Search results
Results from the WOW.Com Content Network
In 2021, CAS rebranded along with a change in logo. The organization updated their mission to be more focused on dynamic responsiveness due to ongoing changes within scientific industries and communities. [19] In 2022, CAS announced the release of almost half a million CAS registry numbers under an open license in their Common Chemistry project.
Different CAS Registry Numbers [1] are used for each form of a substance. For example, something simple like alanine will have one CAS# for the D form, another for L, another for "unspecified" and a fourth one for racemic. There would be another four CAS#s for the hydrochloride, four for the (1:1) sulfate, four for the (2:1)sulfate, etc.
Some registration systems such as the CAS system make use of algorithms to generate unique hash codes to achieve the same objective. A key difference between a registration system and a simple chemical database is the ability to accurately represent that which is known, unknown, and partially known.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Substructure search is used to retrieve from a database of chemicals those which contain the pattern of atoms and bonds specified by a user. It is implemented using a specialist type of query language and in real-world applications the search may be further constrained using logical operators on additional data held in the database.
The last of the non-avian dinosaurs died 66 million years ago in the course of the Cretaceous–Paleogene extinction event, whereas the earliest members of the genus Homo (humans) evolved between 2.3 and 2.4 million years ago. This places a 63-million-year expanse of time between the last non-avian dinosaurs and the earliest humans.
AOL latest headlines, entertainment, sports, articles for business, health and world news.
Trumptanic. 2021: The Week That Felt Like A Year – A ̶F̶o̶n̶d̶ Look Back. Tom Hanks (new footage from December 16, 2020 episode), Meryl Streep (new footage from December 7, 2020 episode) and George Clooney (new footage from December 18, 2020 episode) take "The Colbert Questionert".