How do you get the highest resolution consistently in ion exchange chromatography?
Manufacturers' Literature
Gas Chromatograph. An 8-page brochure describes the Model 2100 life sciences gas chromatograph. Included are chromatograms, specifications, lists of accessories, and prices. Varian Aerograph, 2700 Mitchell Dr., Walnut Creek, Calif. 94598 621 Specific Ion Electrodes. A 24-page booklet is a guide to specific ion electrodes and instrumentation. Illustrations, descriptions, and bibliographical information are given on the company's products. Orion Research, Inc., 11 Blackstone St., Cambridge, Mass. 02139 622 Instrument Leasing. A 6-page smallform folder gives rate schedules and comprehensive plans for the leasing of any analytical instrumentation for periods of 12 months or longer. Scientific Leasing, Inc., 77 Meadowgate, Wethersfield, Conn. 06109 623 Balances
and
Weighing
Systems.
Bulletin 41, 8 pages, includes several new products in its descriptions: a moisture system, a counting system, and a series of over-under scales for quality control use. Also described are 10-mg, 20-kg, and top loaders with optically projected readouts. Ohaus Scale Corp., 1050 Commerce Ave., Union, N. J. 07083 624
Only by using Bio-Rad AG resins! BIO-RAD AG resins represent the highest level of purity available for ion exchange chromatography. AG resins are exhaustively purified and sized to specific ranges to assure sharp resolution and highest reproducibility. For example, the maximum iron content in AG-1 anion resin is 0.00005%. For the full story on BIO-RAD and its role in ion exchange technology—including valuable data on Bio-Rex resins, specialty resins, resin selection, regeneration and applications — send for our general catalog, Price List T.
BIO-RAD Laboratories Dept. A-6 · 32nd and Griffin Ave. Richmond, California 94804 Circle No. 10 on Readers' Service Card See ACS Laboratory Guide for All Products/Sales Office
148 A • ANALYTICAL CHEMISTRY
Melting Points. A 4-page folder gives information on the Kofler Hotbench that determines melting points within 60 sec for any substance within the range of 122 to 500 °F. Hacker Instruments, Inc., P.O. Box 646, West Caldwell, N. J. 07006 625 Spectrophotometer Accessories. Bulletin 153-A, 12 pages, describes timesaving and error-reducing automatic sampling, readout, and printout systems, and accessories developed for use with most spectrophotometers without change in methodology. Arthur H. Thomas Co., Vine St. at Third, Philadelphia, Pa. 19105 626
Company Periodicals Requests for copies of the following publications, catalogs, etc., should be sent directly to the address shown. Business or professional letterheads are requested. Fluorescence News. Vol. 4, No. 4. This 16-page issue includes articles on fluorescence quantum yields and stan-
LOI MEMO DIET!
MMË SEW SAIC0R REAL TIME SPECTRUM ANALYZERS
With a Michelson Interferometer, they provide immediate, high-resolution information pertinent to the component parts of the specimen under test. Offer a different "view" for recognition of characteristics otherwise obscured. Engineered for instant action, simple operation. Spectrum analysis in real time with almost any output format — digital or analog. Solid-state, MOS FET shift register memory for non-spurious data.
Don't buy more resolution than you can use 5 standard models, each designed for the resolution required. SAI-21 (above) was developed for applications requiring 200 point resolution. Only SAICOR makes such a unit; priced at the lowest cost anywhere for the finest real time spectrum analyzer. Lighter weight, smaller size, portability, make it ideal for field and .laboratory.
SAICOR DIGITAL INTEGRATORS FOR ENSEMBLE AVERAGING Improve the detection of periodic signals obscured by noise and of stationary random signals, to secure confidence in the resultant. Digital-integrated value may be observed during and after integration; analog or digital output. Used with the analyzers, the compatible SAICOR integrators affect important economies. They may also be used independently. For literature, write or call Dept. C, Signal Analysis Industries Corp. 595 Old Willets Path, Hauppauge, N.Y. 11787 Phone: 516/234-5700
SAICOR Circle No. 48 on Readers' Service Card
