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According to CAS, his visionary view of CAS' potential "led to expansion, modernization, and the forging of international alliances with other information organizations." [15] CAS was an early leader in the use of computer technology to organize and disseminate information. [16] The CAS Chemical Registry System was introduced in 1965.
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.
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.
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.
Scopus is a scientific abstract and citation database, launched by the academic publisher Elsevier as a competitor to older Web of Science in 2004. [1] An ensuing competition between the two databases has been characterized as "intense" and is considered to significantly benefit their users in terms of continuous improvent in coverage, search/analysis capabilities, but not in price.
Cas Anvar (Persian: کاس انور; born 15 March 1966) [1] [2] [3] is a Canadian actor known for his role in the SyFy/Amazon Prime Video science fiction television series The Expanse. Early life [ edit ]
On October 21, 2016, a message posted on the show's Facebook page announced that Season 2 is "coming soon". [14] The first episode of the second season aired on November 21, 2016, [ 6 ] with episodes released on a weekly basis (excluding a break for Boxing Week ) through the season's conclusion on February 12.
Its first season of seven episodes was released on Netflix on January 4, 2020; [2] season 2 was released on March 1, 2020. [3] In the United Kingdom, the main cast's voices are dubbed with British voice actors, replacing their original American ones. A special mini-movie titled Go! Go! Cory Carson: The Chrissy was released on May