Manufacturers' Literature
Final Exam
Chromatography Supplies. Catalog No. 12, 56 pages, includes gas chroma tography and TLC supplies, and lists available lipids, radiochemicals, calibra tion standards, and reagents. Lawshe Instrument Co., Inc., 4926 St. Elmo Ave., Bethesda, Md. 20014. 610 Analog-to-Digital Converters. Models NS-628 and NS-629, featuring a 50megacycle digitizing rate with a 13-bit address scaler, are described in a fourpage brochure. Northern Scientific, Inc., 2551 W. Beltline, P. O. Box 66, Middleton, Wis. 53562 611 Chromatography Catalog. Whatman products, including paper, thin-layer, and column Chromedia, and other chro matography and electrophoresis needs, are included in a 16-page catalog. Reeve Angel, 9 Bridewell Place, Clifton, N . J . 07014 612
An ISCO monochromatic UV flow monitor is a reliable as sistant which you can trust to give your column efflu ents a comprehensive ex amination with a minimum of effort and supervision. And did you know that of all the instruments of this type, ISCO monitors • are the only true absorbance monitors? • have the narrowest bandwidth and least stray light? • are the only ones which can operate your fraction collector to automatically deposit sepa rate peaks into separate tubes? • with an optional channel alter nator accessory will monitor two columns at one wavelength, one column at two wavelengths, or one column at one wave length but with two flow cell light path lengths? • are priced no higher than in struments having none of these features? All this adds up to the only fully quantitative UV monitors on the market. For more information send for brochure UA31.
INSTRUMENTATION SPECIALTIES CO., INC. ^ . L s i ^ L v
4700 SUPERIOR
LINCOLN. NEBRASKA 6B504
Circle No. 29 on Readers' Service Card See ACS Laboratory Guide for All Products/Sales Office
AquaRater. Bulletin 644 describes this instrument which is designed to measure oxygen demand in the range of 10 to 300 mg per liter. Precision Scientific Co., 3737 W. Cortland St., Chicago, 111. 60647 613 Radioisotopes. Isotopes, including iron-59, strontium-85, chromium-51, calcium-45, and selenium-75, graded ac cording to different levels of specific activity are listed in Brochure No. NS6-68. Nuclear Science, Div. of Interna tional Chemical & Nuclear Corp., P. O. Box 10901, Pittsburgh, Pa. 15236 6 1 4 Products for Analytical Measure-* ment. Laboratory analyzers, crystallographic systems, vacuum systems and components, X-ray thickness gauging systems, and specialty products are in cluded in Bulletin GEA-8410, four pages. General Electric Co., Analytical Measurement Business Section, 4855 Electric Ave., Milwaukee, Wis. 615 Chromatography/Lipid Catalog. Gas, thin layer, and liquid chromatogra phy needs, and high-purity lipids and lipid mixtures are listed in this 32-page, 1969 catalog. Supelco, Inc., P. O. Box 628, Bellefonte, Pa, 16823 616 Specialty
Chemicals
for
Industry.
Specifications and suggested applica tions for the company's line of specialty surfactants and functional monomers are included in this eight-page catalog. Alcolac Chemical Corp., 3440 Fairfield Rd., Baltimore, Md. 21226 617 Gel
Permeation
Chromatronix now offers chemically inert columns with bores from 1 mm to 2 inches for all types of chromatography: ion exchange, gel filtration, gel permeation, adsorption and partition. All columns can produce rapid, high-resolution separa tions using fine packings and pressures up to 500 psi. D Available for use with the columns are water jackets, flow switching valves, sample injection valves, fittings, tubing, and constant-flow pumps. The assembled equipment will handle nearly any solvent, since only glass, Teflon and Kel-F touch the stream. Π Send for 8page technical bulletin on methods of increasing the resolution and speed of chromatography using the most advanced equipment available today.
Chromatography.
Model GPC-300, a basic tool for deter mining molecular weight distributions of polymeric mixtures, is described and evaluated in Technical Report TR-101. Waters Associates, Inc., 61 Fountain St., Framingham, Mass. 01701 618
CHROMATRONIX Chromatronix, Incorporated, 2743 Eighth St., Berkeley, Calif. 94710. Phone (415) 841-7221. Circle No. 16 on Readers' Service Card
VOL. 4 1 , NO. 1, JANUARY 1969
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