M S . U p d a t e d PC v e r s i o n of t h e NIST/EPA/NIH Mass Spectral Data base contains 9000 new spectra for a total of more t h a n 63,000 spectra. The d a t a b a s e f e a t u r e s c h e m i c a l structures for most spectra, a search option for detecting spectra with a specified neutral loss, and the capa bility for comparing up to six spectra. HD Science Ltd. 415 P o l y m e r r e s e a r c h . SYBYL/Polymer can predict vibrational spectra as well as characteristics of crystal line and amorphous polymers. Other features include polymer construc tion and modeling, energy and struc ture optimization for conformers, and calculation of thermodynamics as well as electrostatic and mechani cal properties. Tripos 416
Manufacturers' Literature Gas a n a l y s i s . Brochure describes analyzers and detectors that monitor oxygen levels and gases such as HCHO, H Z S, HCN, Cl 2 , S 0 2 , COCl 2 , HF, Ο,, Br 2 , N 0 2 , NH 3 , CO, C 0 2 , HC1, H 2 , and CH 4 . Portable gas de tectors, fixed monitoring systems, and IR gas analyzers are among the instruments described. 6 pp. CEA In struments 417 R e a c t i o n k i n e t i c s . "Reaction Ki netics: pH-Stat Analysis with the TitraLab Titration System" provides information on the p H - s t a t tech nique for kinetics measurement. The determination of lipase, cholines terase, and protease activity as well as measurement of neutralizing ca pacity and reaction times of antacids are discussed. 20 pp. Radiometer 418 LC. Models UA-6 and 229 UV detec tors are introduced in this brochure. Performance range, sensitivity, auto matic peak separation, flow cells, op tical units, accessories, and specifica tions are described. 7 pp. Isco 419
Catalogs Analytical instruments. "Analyti cal Supplies Catalog 1992" lists prod ucts for AA operation, UV-vis and near-IR spectroscopies, sample in troduction, and GC autosampling; columns, accessories, and operation and maintenance supplies for GC and LC; syringes; standards and re agents; manuals and publications; and training courses. 272 pp. Varian 420
Plasma optical emission mass spectrometer, an ICP source instrument, combines emission and quadrupole mass detectors. The emission detector is a solid-state charge injection device, and the mass detector provides detection limits at the sub-ppb level. Thermo Jarrell Ash 421 NMR. Catalog features NMR sam pling tubes (including information on quality classes, application guides, o.d., and structural specifications), functional modifications of sample
tubes, inserts and microtubes, sam pling accessories, reference s t a n dards, chemicals and solvents, and recording and plotting supplies. Wilmad Glass Company 422
KONTES precision shrunk, ground and polished high resolution tubes are geometrically true to our specifi cations. They are guaranteed to auto-lock and are especially suited to high frequency systems (greater than 200 MHz). Each and every one of our tubes is checked for camber and concentricity using NEW technology developed by KONTES. Variations in your readings will reflect sample differences rather than tube inconsistencies. Add to this our competitive pricing and quick delivery; there's no reason to buy your high performance tubes elsewhere. Ask for details.
most complete KIMBLE Your source for laboratory
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Also available through major scientific distributors. Call Toll-Free 1-800-223-7150.
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ANALYTICAL CHEMISTRY, VOL. 64, NO. 11, JUNE 1, 1992 · 637 A
