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Amino acids. Bulletin discusses amino acid analysis by HPLC using automat ed precolumn ΟΡΑ derivatization and data analysis. Determination of prima ry amino acids in protein hydrolyzates, physiological fluids, and culture media is described. Rainin Instrument Co. 419
Foods. Catalog features product de scriptions and typical test procedures for food, beverage, and cereal analysis. More than 20 analytical tests are pre sented. 20 pp. Hach Co. 425
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Blotting. Guide describes Western blotting detection systems. Protein blotting standards, total protein stains, and immunological detection systems are discussed. Bio-Rad Laboratories 420
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NMR. Brochure features the VXR se ries S NMR spectrometers, including 200 through 600 MHz systems. Spectra of two-dimensional, magic angle spin ning, and other experiments are pro vided. 20 pp. Varian 421
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Vacuum technology. Guide to vac uum technology discusses the princi ples, types, modes of operation, design fundamentals, and applications of turbomolecular pumps. 40 pp. Balzers 422
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Dielectric analyzer. Brochure high lights the Model 2970 dielectric analyz er, which measures changes in thermal, Theological, and molecular properties of polymeric materials that affect pro cessing behavior and end-use perfor mance. 20 pp. Du Pont 423 Immunoassay. Development of Microparticle Tests and Immunoassays discusses the factors to be considered in the development of a latex-based im munoassay, including test format, test methodology, and ligand coupling methods. 38 pp. Seradyn 424
LC. Catalog features columns for HPLC, including general-purpose, high-speed, and high-resolution col umns. Columns for special applications are also listed. 34 pp. Beckman 431 Environmental analysis. Catalog lists standards required for EPA meth ods 500, 600,8000, and the contract lab program. Also included are PCB, pesti cide, and PAH standards. 20 pp. Ultra Scientific 426 Scientific equipment. Catalog in cludes sample handling and hydrolysis tubes, evaporator and vacuum traps, microscale kits and accessories, solvent repurification systems, and products for HPLC. 32 pp. Kontes 427 Instrumentation. Catalog lists flow meters, McLeod gauges, manometers, micrometer and Teflon-glass valves, and syringes. An appendix of technical information is included. 66 pp. Gilmont Instruments 428 Chemicals. Catalog includes amines, anilines, benzyl halides, disulfides, fluorinated compounds, hydrazides, mercaptans, phosphonic acids, pyridines, styrènes, and thiophenols. 176 pp. Fairfield Chemical Co. 429 Thermometers. Catalog lists bimetal, liquid-in-glass, vapor tension, and digital thermometers for general, laboratory, industrial, and process applications. 16 pp. PSG Industries 434
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AAS supplies. PE XPRESS catalog includes lamps for AAS, AA burner system components, ICP torch components and accessories, graphite furnace tubes and supplies, ICP/MS supplies, reference and training materials, and data products. Perkin Elmer 432
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Centrifugation. Catalog lists centri fuge tubes and accessories, including microscale, medium-range, high-speed, and ultracentrifugation tubes. Also in cluded are chemical resistance tables and speed charts. 40 pp. Sarstedt 430
AT balances can determine the weight of a 200-g object with a precision of 0.0001 g. The instruments feature auto matic draft protection and calibration systems. Mettler 402
50 A · ANALYTICAL CHEMISTRY, VOL. 61, NO.
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TLC. 1989 catalog features analytical and preparative TLC plates in a variety of adsorbents and accessories such as developing chambers, sample application devices, and portable UV lamps. Analtech 433
