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CIRCLE 151 ON READER SERVICE CARD As chemists become aware of the available services, and participate in advocating introduction of the new technologies mentioned above, it is es- sential that they become familiar with how computers store and process in- formation requests. The reasoning and difficulty involved are not different from thé processes involved in learn- ing to use Chemical Abstracts, Beil- stein and Gmelin. But the rewards will be infinitely greater, and in any case the process is unavoidable. Over the next 20 years our libraries will slowly convert, for scientific purposes, from the cellulose technology of today to the electronic technology described. Acknowledgment The authors express their thanks for the time and energy, as well as ed- ucational skills, of the following: John Roach, Food and Drug Administra- tion; Lawrence Dusold, Food and Drug Administration; Charles Gold- stein, National Library of Medicine; Kay Pool, Interactive Sciences Corp.; Melvin Spann, National Library of Medicine; Personnel, Owens-Illinois Technical Library; A. R. Pierce, Vir- ginia Polytechnic Institute and State University Library; Victoria Kok, Vir- ginia Polytechnic Institute and State University Library; Martha Williams, University of Illinois; Frank Scardi- glia, Dart Industries; Dan O'Hare, Dart Industries; The material on ap- plications of inverted lists/IMAGE is drawn largely from elegant implemen- tation in the Analytical and Test Divi- sion of Dart Industries, Chemical- Plastics Group. A Reading List Richard A. Kaimann, "Structured Infor- mation Files," Melville Publishing Co., Los Angeles, 197!!. Idea; Concepts and Facilitie.s, Data General Corp., 1976. Mumps Language Standard, NBS Hand- book 18, 1976. Image Users Manual, Hewlett-Packard, 1975. Mass Spectral Search System: An Over- view; ADP Network Services, Cyphernet Division, 1975. MSSS Users Manual, ADP Network Ser- vices, Cyphernet Division, 1975. F. W. McLafferty, R. H. Heitel, and R. D. Villwock, "Probability Based Matching of Mass Spectra, Rapid Identification of Special Compounds in Mixtures, Org. Mass Spectrum. 9, 690 (1974). K.W.K. Yim, T. C. Miller, and L. R. Faulk- ner, "Chemical Characterization Via Flu- orescence Spectral Files: Data Compres- sion Via Fourier Transform," Anal. Chem., 49,2069(1977). R. (î. Dromey, "Inverted File Structure for Molecular Formula and Homologous Se- ries Searching of Large Data Bases," ibid., ρ 1982. Isenhour, McLafferty et al., "Comparison of Κ Nearest Neighbor Voting Schemes with the Self-Training Interpretive and Retrieval System for Identifying Molecu- lar Substructures from Mass Spectral Data," ibid., ρ 1720. F. W. McLafferty, "Performance Predic- tion and Evaluation of Systems for Com- puter Identification of Spectra," ibid., ρ 1441. Mass Spectral Identification Systems User's Guide, Cornell University, 1975. I. K. Mun, R. Venkataraghavan, and F. W. McLafferty, "Computer Assignment of Elemental Compositions of Mass Spec- tral Peaks from Isotopic Abundances," Anal. Chem., 49, 1720 (1977). D. H. Smith, M. Achenbach, W. J. Yeager, D. J. Anderson, W. L. Fitch, and T. C. Rindfleisch, "Quantitative Comparison of Combined Chromatographic/Mass Spectrometry· Profiles of Complex Mole- cules " ibid., ρ 1623. Proceedings of the 1975 Clinic on Library- Applications of Data Processing, F. Wil- frid Lancaster, Ed., University of Illinois, Urbana, III., 1975. Retrieval of Medicinal Chemical Informa- tion, ACS Symp. Ser. i-84, W. Jeffrey H< >we, Margaret M. Milne, Ann F. Pen- nell, Eds., 1978. Information Systems and Networks, 11th Annual Symp. John Sherrod, Ed., Green- wood Press, Westport, Conn., Mar. 27 29, 1974. Annual Review of Information Science and Technology, 13, Martha Williams, Ed., Knowledge Industry Publ., White Plains, N.Y., 1978. Journal of Chemical Information and Computer Sciences, Delos F. DeTar, Ed. On Line Review—The International Jour- nal of Online and Teletext Information Systems, Martha Williams, Kd., for U.S. Database Catalog 1979, Lockheed Missiles and Space Co., Palo Alto, Calif. Sources of Commercial or Publicly Available Data Bases ORBIT System Development Corp. 2500 Colorado Avenue Santa Monica, Calif. DIALOG Lockheed Missiles and Space Co. Sunnyvale, Calif. CIS Interactive Science Corp. Suite 500 918 16th St., N.W. Washington, D.C. CHEMLINE, TOXLINE, CATLINE Specialized Information Services National Library of Medicine, Room C6B 8600 Rockville Pike Bethesda, Md. PBM-STIRS PBM-STIRS Contact Computing Center Cornell University Ithaca, N.Y. TELENET TELENET Communications Corp. 1050 17th Street, N.W. Washington, D.C. TYMNET TYMNET Corp. 10261Bubb Road Cupertino, Calif. 95014 948 A • ANALYTICAL CHEMISTRY, VOL. 51, NO. 9, AUGUST 1979 EXAC™ 2000 Energy Dispersive X-Ray Spectrometers Solve today's problems with the most flexible computer-based system available.. .and be ready for tomorrow's challenges! ENVIROTECH ® NEC 963 Industrial Road San Carlos, California 94070 Phone (415) 591 8203 79/06 • Comprehensive library of quantitative and qualitative programs written in NEC BASIC II (the Spectroscopy Language of Today) • Unique operating simplicity through Operator Command Console with single function push buttons • Unexcelled expandability in hardware and software
