Product News

Higher system limits increase the power of STN substance-based searching

November  12th,   2010

Substance searchers on STN now have vastly enhanced searching power due to a recent increase in search limits in the CAS databases. The increased limits provide greater flexibility and efficiency in the substance-search processes.

  • The iteration and answer limits for CAS REGISTRY structure searching are increasing from  
    • 2 million to 6 million for online searches
    • 3 million to 8 million for batch searches

REGISTRY iteration and answer limits

Current 

New 

Online searches

2 million

6 million

Batch searches

3 million

8 million

  • The current accession number crossover limit from MARPAT to and from the CA/CAplus databases is doubling from 50,000 to 100,000.

MARPAT crossover limits

Current 

New 

50,000

100,000

The increase in system limits will permit broader REGISTRY structure searches to run to completion, increasing search power and efficiency. Enhanced crossover limits allow increased flexibility as searchers move between key STN data sources.


About CAS

Chemical Abstracts Service (CAS), a division of the American Chemical Society, is the world's authority for chemical information. CAS is the only organization in the world whose objective is to find, collect and organize all publicly disclosed substance information. A team of scientists worldwide curates and controls the quality of our databases, which are recognized as the most comprehensive and authoritative by chemical and pharmaceutical companies, universities, government organizations and patent offices around the world. By combining these databases with advanced search and analysis technologies (SciFinder® and STN®), CAS delivers the most current, complete, secure and interlinked digital information environment for scientific discovery.

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 Media Contact

 Name: Rhonda Ross
 Phone: 614-447-3624                                       
 Email: cas-pr@cas.org