Printing 448 INDEX

GORE. The CORE Electronic Chemistry Library is a joint project of Cornell University, OCLC (On-line Computer Library Center), Bell Communications Research (Bellcore), and the American Chemical Society. The CORE database will contain the full text of American Chemical Society Journals from 1980, associated information from Chemical Abstracts Service, and selected reference texts. It will provide machine-readable text that can be searched and displayed, graphical representations of equations and figures, and full-page document images. The project will examine the performance obtained by the use of a traditional printed index as compared with a hypertext system (SUPERBOOK) and a document retrieval system (Pixlook) (6,116). 

The Eight-Peak Index of Mass Spectra published by the Mass Spectrometry Data Centre of the Royal Society of Chemistry is a popular printed index of mass spectral data that now contains some 81000 spectra of over 65000 different compounds [4], These spectra are published in the shape of lists of the eight main peaks. The complete data are sorted in three different ways to allow easy identification of unknown compounds by (i) molecular weight subindexed on molecular formula, (ii) molecular weight subindexed on m/z value and (iii) m/z value of the two most intense ions. 

In the online environment these are redundant as freestanding indexes since on ScienceDirect simple searches can achieve the same results more efficiently and quickly. In addition, whilst the print Index of Adverse Reactions was necessarily selective no such constraint affects the online edition. 

If the subject is very important, the searcher cannot afford to depend on the printed indexes. He will have to page the volume itself, or certain portions of it. He may even have to page certain original periodicals that are most specific to the field of the search. 

Indexes list magazines, journals, newspapers, audio and video sources, books, and collections that contain material you may wish to consult. Most of these indexes are now available on computer databases you will probably find the most current information there because databases are frequently updated. Some printed indexes, in contrast, may be revised and published only once a year. However, if electronic databases are not accessible, you can always turn to the print versions available at your library. For example, if you think your topic has been the subject of articles in general-interest magazines, you might consult The Reader s Guide to Periodical Literature for newspaper articles, you might check The New York Times Index or the National Newspaper... 

The second checker for procedure 68 should be Dominique Matt (not Watt as printed). Index of Contributors change Watt, D., 26 372 to read Matt, D., 26 372. 

The inverted file is. then, merely a computer application of traditional indexing philosophy. Perhaps the most important difference between computer searching and manual search of a printed index is that the computer enables coordination to be done much more easily at search time. In a computer search, the required term coordinations can be specified, as a Boolean expression for example, much more precisely than could be achieved by any precoordinated indexing system. Computer systems therefore convey a much greater flexibility. 

Although they are only indirectly concerned with information retrieval from the literature, it is worth noting that the computer has also made significant contributions to the production of printed indexes. Much of the work has involved the production of traditional indexes by computer methods, ranging from simple Uniterm and keyword indexes to fully articulated subject indexes and dual dictionaries. Products more particularly of the computer age are permuted indexes such as the Permuterm Index of the Institute for Scientific Information and the KWIC, KWAC, KWOC family. 

The purpose of the printed Indexes is to give an overview of the substances and mixtures for which data tables are provided. 

If thorough searches in both Beilstein and SciFinder turn up no exact matches for the structure in question, it is advisable to search the molecular formula and/or name in the pre-1967 Chemical Abstracts printed indexes. If you still are unable to find a match, you can fairly safely assume that the compound has not been fully characterized in the literature. Further searches for similar compounds can then begin. 

There are three printed indexes a name index which lists every compound name or synonym in alphabetical order a molecular formula index which lists all molecular formulae, including those of derivatives, in Hill convention order and a CAS registry number index listing all CAS numbers included in the Sourcebook in serial order. All indexes refer to the entry number. In the name index an entry number which follows immediately upon an index term means that the term itself is used as the entry name but an entry number which is preceded by the word see means that the term is a synonym to an entry name. In all three indexes an entry number which is preceded by the word in refers the reader to a specified stereoisomer or derivative which is to be found embedded within the particular entry. 

In addition to the three printed indexes, each element section is preceded by a graphical structure index allowing the rapid visual location of compounds of interest. The structure index reproduces all structure diagrams present in that element section in reduced size and printed in entry number order. 

Print indexes have been superceded to a large degree by their database counterparts on the Web, but they can stiU play an important role in access to those older materials not yet covered online. Records are usually arranged in some type of classed subject scheme or they can be alphabetically... 

ISMEC Mechanical Engineering Abstracts. 1988-1992. Bethesda, MD Cambridge Scientific Abstracts. This bimonthly print index, with annual cumulated indexes, was succeeded by... 

The first CAS product on CD-ROM was the 12th Collective Index which allows browsing as well as five-year retrospective searching for many pieces of information effectively buried in an alphabetically arranged printed index. The 115-book printed set, occupying ovct six meters of shelf space, was reduced to just ten discs. The collection of CA abstracts from the same period was also produced on CD-ROM. Plans are well under way to produce the 13th Collective Index on CD-ROM by the end of 1997. 

Eight printed indexes are included in Part 2 (Chap. 4) ... 

When the polymer structure is well documented by the author or can be confidently assumed, because one and only one structure is chemically possible, then a supplementary representation with a corresponding systematic name is added to the CAS Registry System and included in the printed indexes and online files. 

The Chemical Abstracts System (CAS) produces a set of various databases ranging from bibliographic to chemical structure and reaction databases. All the databases originate from the printed media of Chemical Abstracts, which was first published in 1907 and is divided into different topics. Author index, general index, chemical structure index, formula index, and index guide arc entries to the corresponding database (Table 5-3). 

The Merck Index Online Merck Co., Inc. Dialog, CIS, BRS, the online counterpart to the printed 11th ed. of The Merck Index, records contain molecular formulas and weights, systematic... 

Department ofiDefiense Index ofi Specifications and Standards, Superiatendent of Documents, U.S. Government Printing Office, Washington, D.C., pubhshed annually. 

The ChemicalF hstracts database does not have an on-line family capabUity, but does pubHsh a patent index, with family data obtained from INPADOC. Printed patent indexes have been including family information since the 1960s, but the number of countries covered before 1970 was limited. 

Coordinate Indexing and Boolean Logic. Three methods of indexing have been prominent in the chemical Hterature in recent times. The first, articulated indexing, has been used in printed Chemicaly hstracts subject indexes from their earliest days until well into the 1990s. A number of important concepts are identified as permissible index entries, including specific compounds, material types, reactions, and processes. One or more modifying statements foUow each basic index entry. Thus, eg. 

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