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ACS AUDIO COURSES
keep up with successful chemists
The best way to keep pace with chemistry's rapid progress is to learn from the chemists who help make it happen. More than 25 ACS Audio Courses are now available—all prepared and recorded by leading chemists teaching their own specialties. All courses include audiotape cassettes and comprehensive manuals with information, diagrams and other visual material, many with exercises so you can combine the ease of listening with the challenge of doing as you learn. The courses cover all levels and interests, introductory and refresher topics, specialized subjects and techniques, non-technical courses to aid your personal development. Best of all, all ACS Audio Courses are offered on a money-back guarantee basis . . . so you can't lose. Send coupon below for more information. Department of Educational Activities American Chemical Society 1155 Sixteenth Street, N.W. Washington, D. C. 20036
Manufacturers' Literature U V - V I S Spectrophotometers. Series 634 spectrophotometers are described. Model 634S permits tracing of spectra or kinetics data on an external chart recorder. Wavelength range is 1 9 0 - 9 0 0 nm. Digital readout provides accurate and linear absorbance data, percent transmittance, or concentration. Other models share many of the same features. 6 pp. Varian Instrument Division 425 Biochemicals/Chromatography Products. The latest issue of " L i f e Scie n c e s " includes information on new nucleotides, buffers, and biochemicals as well as a new dry column chromatography technique. 6 pp. ICN Pharmaceuticals, Inc. 426 pH Electrodes. Full line of electrodes and accessories is described. The electrodes feature sealed construction and are made of a high impact polymer body. 8 pp. Graphic Controls Corp. 427 Gas Chromatograph Detector. Application Note ANGC 2-76 describes a recently developed gas chromatograph detector that is sensitive to both nitrogen and phosphorus-containing organic compounds. The detector operates in both modes without change in polarity or gas flows and shows high selectivity over hydrocarbons, sulfurous, and chlorinated compounds. 8 pp. HewlettPackard Co. 428 Column Chromatography Separations. Thirty-six figures show the separations obtainable using alumina and silica Woelm adsorbents at low pressures. Separations illustrated include pharmaceutical formulations, insecticides, dyes, acids, esters, aromatic nitro c o m pounds, and many others. 20 pp. ICN Pharmaceutical, Inc. 429 Fatty Acid Analysis. Free fatty acids, fatty alcohols, and fatty amides are separated and analyzed with a new liquid chromatographic column. Use of the column avoids lengthy sample preparation and high-temperature sample oxidation. 4 pp. Waters Associates 430
Please send information on ACS Audio Courses Electromagnet. V-7400 series 15-in. electromagnet provides extremely high field strength, a large range of field homogeneities, thermally protected
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850 A · ANALYTICAL CHEMISTRY, VOL. 48, NO. 11, SEPTEMBER 1976
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