LC detector. Brochure highlights the Wyatt/Optilab 903 interferometric refractometer for macromolecular char acterization. Theory, design, off- and on-line operation, and specifications are described. Wyatt Technology 421 LC. Brochure describes instrumenta tion for HPLC, including microproces sor-controlled pumps, low- and highpressure gradient systems, robotic autosamplers, detectors, integrators, and software. Hitachi 423
Catalogs Syringes. Catalog includes syringes for HPLC, GC, TLC, MS, and biotech nology applications. Liquid- and gastight syringes in sizes from 1 μL to 100 mL are listed. Unimetrics 425 Chromatography. Catalog lists col umns, accessories, and standards for GC and HPLC. Products for sample preparation and environmental analy sis are included. J & W Scientific 430 Filtration. Catalog contains products for process filtration applications in
Genepure 341 automates the purification of genomic DNA or RNA from sources such as whole blood, plants, leukocytes, and viruses. Up to eight samples can be handled simultaneously. Applied Biosystems 402
the pharmaceutical industry. Crossflow systems, standard and mini car tridge filters, and ready-to-connect fil tration units are included. Sartorius 428 Laboratory products. Catalog in cludes microcentrifuge tubes, vials, cylinders, ultrasonic cleaners, mechan
From pesticides/residues to food and feed processing
ical balances, portable pH meters, and hot plates. Fisher Scientific 427 Reagents. Catalog features reagents for molecular biology and electropho resis. Chemical formulas, weights, ana lytical specifications, and recommend ed storage conditions are listed. Fisher Scientific 429
Journal of
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ANALYTICAL CHEMISTRY, VOL. 62, NO. 15, AUGUST 1, 1990 · 851 A
