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PRODUCTS sented along with typical reports and spectra. 6 pp. Perkin Elmer 415 H P L C . Bulletin No. 246 describes UV and conductivity detectors, col u m n h e a t e r s , and pumps for HPLC systems as well as components for modular IC systems, an on-line mo bile phase recycler for LC systems, and data management hardware. Sample c h r o m a t o g r a m s , specifica tion tables, and price tables are in cluded with each product descrip tion. 16 pp. Alltech 416 G C / M S . "Background Correction for GC-Combustion-IRMS" is a techni cal note describing a performance test for Isochrom, a software package designed to correct background for carbon isotope ratio analysis of com plex organic mixtures. The software s e l e c t s specific b a c k g r o u n d r a t i o points along the chromatogram and p e r f o r m s c u r v e f i t t i n g on t h e m . Fisons 417
Model 9001 gas chromatograph incorporates up to three N/P, flame ionization, or photoionization detectors into the main body of the instrument. The system can be linked to a LabQuest data station and to optional autosamplers, purge-andtrap accessories, and air concentrators for environmental and QC applications. An optional purged valve oven integrated into the detector compartment allows the configuration of complex gas analysis systems. Tremetrics 413
S p e c t r o m e t r y . "SpectraBook, Vol. Π" spectral i n t e r p r e t a t i o n t u t o r i a l software provides data and spectra for 50 organic compounds selected to demonstrate i n t e r p r e t a t i o n princi p l e s in m a s s , IR, NMR, a n d 1 3 C NMR s p e c t r o m e t r y . T h e software runs under Windows 3.0 for PCs, and SpectraDeck, a Macintosh-compati ble version, r u n s under HyperCard 1.2. Demo disks are available. Sa vant 411 C r y s t a l l o g r a p h y . SolidState crystallographic structure analysis soft ware simulates diffraction, scatter ing, composition, and NMR spectral d a t a for v a l i d a t i o n of s t r u c t u r a l models and performs crystal struc ture optimization. The software in cludes crystallographic, visualiza tion, and structure editing tools and can manipulate structures for inor ganic and organic crystals, metals, and glasses. Biosym 412 M o l e c u l a r m o d e l i n g . HyperChem v3 is a Windows-compatible 3D mo lecular modeling software package
that allows data transfer to and from external word processing, database, and spreadsheet programs. The u p grade includes prediction and analy sis of IR, UV, and visible spectra; protein modeling with ribbon struc tures; modeling of molecules contain ing t r a n s i t i o n metals; and format t i n g of files for compatibility with s t a n d a r d chemical d a t a b a s e s a n d molecular modeling programs. Auto desk 414
Manufacturers' Literature L u m i n e s c e n c e spectrometry. Bro chure describes a fast filter accessory for the Model LS-50B luminescence spectrometer. The accessory en h a n c e s d a t a collection speed more t h a n 45-fold for biochemical studies of rapid fluctuations in concentra tions of intracellular calcium or mag nesium ions or changes in pH. Fluo rescent indicators for excitation and emission wavelengths are listed in tables, and sample screens from ac companying control software are pre-
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F e r m e n t a t i o n m o n i t o r i n g . Appli cation note for t h e Q u a n t u m 3000 mass spectrometer discusses sample requirements, ranges, operating pro cedures, and data analysis in on-line analysis of fermentation gases. The spectrometer monitors multiple com ponents and streams at 15-20 s per sample, detects process abnormali ties, and determines respiratory quo tient and mass balance to optimize the fermentation process. ABB Pro cess Analytics 418
Catalogs GC. Catalog for GC lists capillary and packed columns, syringes, glass ware and sample-handling accesso ries, detectors, data acquisition sys t e m s , a n d c o m p l e t e GC s y s t e m s . 60 pp. Anspec 419 D e t e c t o r s . Catalog describes pho tonic devices such as linear image sensors, photodiodes, and IR detec t o r s . Included is information on a silicon photodiode with a built-in op tical amplifier, InSb and GaAs IR linear image sensors, thermoelectrically cooled MOS linear image sen sors, silicon avalanche photodiodes, and a compact microchannel plate PMT. 32 pp. Hamamatsu 420 C h r o m a t o g r a p h y . Catalog lists products for SFC, GC, a n d HPLC; Inno-Wax capillary columns; GC in let kits; an electron multiplier; and disposable autosampler supplies. Hewlett Packard 421
