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Operators for Relating Search Terms

Operator Relationship of Terms Example
AND Both terms must be present
in an answer
=> S ANABOLIC AND STEROID?
OR At least one term from a series
must be present in an answer;
enclose terms in parenteses.
=> S (HEART OR CARDI?)
NOT Eliminate terms; use with
caution
=> S PLASMA NOT BLOOD
(W) Terms are adjacent and in the
order entered; automatically
supplied by STN if necessary
when a phrase is entered
=> S X-RAY

STN searches X (W) RAY

(S) Terms are in the same
information unit (title/indexing
field) or the same sentence in the
abstract in any order and with
any number of words in between
=> S GAS (S) CHROMATOG?

Reproduced with the permission of CAS, a Division of the American Chemical Society, from "Tips for Searching the CAplus & REGISTRY Files." (CAS9613-0298)