CAS ONLINE

In the mid and late 1990s CAS developed the ChemPort module as a linked gateway to primary literature. The CAS online delivery clients arc able to move into CbemPort to display primaiy literature by presenting stored or dynamically generated URLs to ChemPort. Conversely, ChemPort will link a user to SciFinder to provide access to the CAS databases. 

Stmcture searching and display software are host-specific. The Softon Substmcture Search System (S4) was developed by the Beilstein Institute and Softon of Graefelfing Germany (50). It is a full stmcture and substmcture searching module. The S4 is used in-house by the Beilstein Institute and is operated by DIALOG. STN uses CAS ONLINE s messenger software for on-line stmcture searching of the Beilstein on-line database (51). 

A number of files under the generic tide CAS ONLINE are available on-line on STN International. The system software, MESSENGER, includes chemical substmcture, text, and numeric data searching facHities. Chemical stmctures and Registry Numbers are contained in the CA Registry file. The four ways to search the stmctures are EXA, EAM, SSS, and CSS. 

Description, Acquisition, Retrieval, and Correlation File. This is the only other pubhc substmcture search system, apart from CAS Online, that provides full access to the CAS Chemical Registry File. The DARC file, commercially available on-line from Telesystems-Questel, offered the first pubhc on-line implementation of substmctural searching of the CAS Chemical Registry System. The advantages and disadvantages of the CAS Online and DARC systems have been discussed (49). 

However, if one lacks access to these, one may consult Chemical Titles and the keyword index (p. 1611) at the end of each issue of CA. In these cases, of course, it is necessary to know what name might be used for the compound. The name is not necessary for Index Chemicus (p. 1622) one consults the formula indexes. However, these methods are far from complete. Index Chemicus lists primarily new compounds, those which would not have been found in the earlier search. As for chemical Titles, the compound can be found only if it is mentioned in the title. The keyword indexes in CA are more complete, being based on internal subject matter as well as title, but they are by no means exhaustive. Furthermore, all three of these publications lag some distance behind the original journals. To locate all references to a compound after the period covered by the latest semiannual formula index of CA, it is necessary to use CAS-online. 

CAS Registry Number (CASRN) This unique identifier is assigned by the American Chemical Society to chemicals recorded in the CAS Registry System. This number is used to access various chemical databases including the Hazardous Substances Data Bank (HSDB), CAS Online, Chemical Substances Information Network, and many others. This entry is also useful to conclusively identify a substance regardless of the assigned name. 

Rutgers Center of Alcohol Studies (CAS). Online. Available HTTP (accessed 2 April 2003). 

TABLE 1. CAS online investigation on liquid crystals with different functional groups... 

CAS Online, available from Chemical Abstract Service, Columbus, Ohio. MACCS and MACCS-3D, available from Molecular Design Ltd, Hayward, California. 

Commonweal. 2005. Taking It All In Documenting Chemical Pollution in Californians Through Biomonitoring. Commonweal Biomonitoring Center, Bolinas, CA [online]. Available http //www.commonweal.org/programs/download/TIAI Lo-Rez.pdf [accessed April 17, 2006]. 

CAS ONLINE American Chemical Society, Columbus, Ohio CAS ONLINE The Chemical Search System From Chemical Abstracts Service 1967-present CHEMICAL ABSTRACTS SERVICE Equivalent of the printed Chemical Abstraets(CA). Bibliographic data, keyword phrases, index entries, general subject headings, and CAS Registry Number(s) for chemistry-related publications in 50 languages from 150 countries. Includes worldwide patent documents. Easy crossover to the CAS CHEMICAL REGISTRY... 

Fig. 1.10. Drawing captured from CAS Online, processed by CASKit-1 and directly imported into ChemText and scaled.

Hedda Schulz and Ursula Georgy, From CA to CAS Online, 2nd ed., Nichigai Associates, Tokyo, 1995. 

In-house chemical information management systems began to emerge at some of the larger chemical and pharmaceutical firms. These included CONTRAST and SOCRATES at Pfizer, SYNLIB at SmithKline, COUSIN at Upjohn, MSDRL/CSIS at Merck, and CROSSBOW at ICI (27). The Chemical Abstracts database was made available online in 1967 (28). In 1980 this became CAS ONLINE. A compre-... 

Schulz, Hedda, and Ursula Georgy. From Ca to Cas Online Databases in Chemistry. 2nd ed. New York Springer-Ver-lag, 1994. 

TABLE 29.1 Scientific Journals Containing Articles about 3D QSAR, as Referred by CAS Online September 2007... 

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