Chemical Nomenclature and Subject Term Selection Aids: Annotated List

        1. "Index Guide" to Chemical Abstracts. 
         This should be the first place you look before beginning  either 
        a  manual or computer-based subject search.  Each five-year  col-
        lective  index period has its own Index Guide  volume.   Although 
        the  Chemical  Abstracts  database is in one huge  file  on  some 
        vendors'  systems, you still need to be aware that for  a  retro-
        spective search which crosses the boundaries of collective  index 
        time  periods  (1967-71, 1972-76, 1977-81,  1982-86,  etc.),  the 
        terms  which were used at the time the printed product  was  pro-
        duced  are still the terms in the database.  Thus,  two  entirely 
        different  controlled vocabulary terms may be used to search  for 
        information  on the same concept or even the same  chemical  com-
        pound, depending on the time an article or other primary work was 
        pub lished.  The Index Guide contains cross-references  and index-
        ing  policy notes to guide you to the controlled  vocabulary  for 
        both  chemical  substances  and general  subjects.  However,  not 
        finding an entry in the Index Guide does not mean that you should 
        not  use that term.  In fact, it means that you  probably  should 
        use  the  term  or phrase.  A full set of Index  Guides  is  also 
        shelved with the collective indexes to Chemical Abstracts.
        2.  CA Headings  List:  General  Subjects and CA  Headings  List:  
        Plants and Animals (May 1985).
         Index  headings  and cross-references for the  Ninth  Collective 
        Index  period  (1972-76), the Tenth (1977-81)  and  the  Eleventh 
        (1982-86)  periods  are  listed in these volumes.   Thus,  it  is 
        possible  to find in one place the changes in  terminology  which 
        have occurred for general subjects, plants, and animals.  
        3. Registry Handbook-Common Names (1984).
           This  is a microfiche set which allows you to find a  registry 
        number  and  molecular formula using a  relatively  uncomplicated 
        name for the substance.  The Name Section has chemical names from 
        the  CAS  Registry  Nomenclature File.  There is  also  a  Number 
        Section which lists both the CA Index Names (prefer red names) and 
        common substance names in the Handbook.  The Number Section  also 
        tells you when a particular CA Index Name was used in CA.  Locat-
        ed in the metal Kodak file on the Computer Reference Shelves.
        4.  New  and Revised Chemical Abstracts Indexing Terms  1982  and 
         These documents describe changes which took effect at the begin-
        ning  of the 12th collective index periods, for  General  Subject 
        Index headings and class es of substances. 
        5. Qualified Substances in the CA File (June 1985).
           A chemical substance is said to be "qualified" if it is one of 
        the ap proximately 600 substances which are found so frequently in 
        CA that its registry number is linked with one of seven  standard 
        qualifiers.  These are:
             Biological studies
             Uses and miscellaneous
           Thus,  the  main  type of information in a  document  about  a 
        substance in the list is entered into a database using one of the 
        seven terms or phrases.  
        6.  Search Aid  for  Name  Searching Frequently Posted Name  Seg-
        ments in the Registry File (April 1985).
         Name segments for chemical substances can be searched in the CAS 
        ONLINE Registry File.  Name segments with more than 1000 postings 
        are  listed  in this booklet.  For example, the term  METHOXY  is 
        actually segmented into two parts, METH and OXY.  
        7.  Standard  Abbreviations,  Acronyms,  Special  Characters  and 
        Symbols in CAS Computer-Readable Files and Publications (1982).
        Abbreviations have been used for certain terms both in the index-
        es and abstract text of CA.  It is important to include  relevant 
        abbreviations, etc. in a computer-based search.  
        8.  Subject Coverage and Arrangement of Abstracts by Sections  in 
        Chemical Abstracts (1982 edition) and Supplement.
             This manual gives the guidelines and policies which identify 
        the  subject  content of the 80 CA sections  into  which  printed 
        primary materials are div ided according to their subject content.  
        Summaries of changes in various sections over the years are found 
        in  the  supplement.   Copies may also be found  with  the  Index 
        Guides on the CA Collective Index shelves.
        9. Ring Systems Handbook (1984).
           The handbook contains structural diagrams and related data for 
        nearly  60,000 unique representative CA index ring  systems.   It 
        also  includes  data  on cage systems.  A  "Ring  Formula  Index" 
        provides  access by the number of rings in the compound  and  the 
        number  of atoms comprising those rings.  There is also  a  "Ring 
        Formula  Index"  by molecular formula.  The entries  provide  the 
        registry  numbers of the unsubstituted rings which could be  used 
        in  a  Registry File search as the starting point for  a  complex 
        ring compound.  Shelved with the CA Collective Index volumes.
        10.  Medical  Subject  Headings--Supplementary  Chemical  Records 
          This  publication contains approximately 23,000  chemical  com-
        pounds   mentioned in journals covered by Index Medicus  and  the 
        computer database  MEDLINE.  
        11. CA Condensates and CASIA Search Aids (1975, 1976).
           These  microfiche  sets  contain various lists  of  words  and 
        frequency  counts of their occurrence in certain  older  Chemical 
        Abstracts  volumes.  On the basis of the relative frequencies  of 
        occurrence  of these terms, one may be able to predict the  rela-
        tive size of the sets which they would retrieve.

CCIIM: 31-02.487

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