Malvern Instruments Inc

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New Products

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Chemicals

DETECTOR:

Calibration kit

$59991 (includes installation kit)

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Performance: This new Model 4420 |H^ electrolytic conductivity detector for " "«i your GC selectively detects halogen, SFI FCTIVF sulfur and nitrogen compounds. Sensitivity is up to 20 times that of any other electrolytic conductivity detector. Perfect for both capillary and conventional packed columns. Compatibility: The 4420 is manufactured in ten different versions, each specifically engineered for neat installation and full compatibility with major gc's of the following types: HP 5790, 5890, 5880: PE Sigma 1-4, 300, 2000, and 8300; TRACOR 540, 560, 565 and 570; Varian 3300, 3400, 3700, and Vista series; Schimadzu; and IBM. Installs in 10 minutes. Buy one: Write or call for a detailed brochure, including representative chromatograms. 800-445-0016. Texans call 409-693-1711. P.O. Box 2980, College Station, TX 77841-2980.

CM-CORPORATION CIRCLE 156 ON READER SERVICE CARD

NO CHARGE? no problem for Zetasizer He In studies of flocculation and colloid stability, the region close to the zero point of charge is the most critical. It is in precisely this region of low mobility that other electrophoresis systems are least accurate and most difficult to use. With its high frequency optical modulator, the Malvern Zetasizer lie solves this problem, allowing you to measure mobility and zeta potential with uncompromising accuracy right across the range. Measurements are simple, fast and operator-independent and Zetasizer lie also gives you built-in submicron pnrtHr size capability.

Learn more about the potential of Zetasizer lie in your laboratory — contact MALVERN today.

MALVERN

Malvern Instruments Inc. 200 Turnpike Road, Southborough, MA 01772, USA Telephone: (617) 480 0200

Telex: 311397

CIRCLE 135 ON READER SERVICE CARD 788 A · ANALYTICAL CHEMISTRY, VOL. 58, NO. 7, JUNE 1986

Carbamylyte calibration kit for 2-D electrophoresis consists of a set of highly purified protein standards whose free amino groups have been progressively carbamylated to create welldefined mixtures of differently substituted molecules. Each successive substitution produces a new molecular species of different pi. Pharmacia 422

SRM Two SRMs for use in calibrating DSCs, DTAs, and similar instruments are available: SRM 2220, Tin, and SRM 2221, Zinc. They are certified for melting temperature and enthalpy of fusion and were measured by DSC according to ASTM recommended practices E967 and E968. NBS 423

Standards Prestained electrophoresis standards allow users to localize resolved peptides, monitor runs for optimal resolution, eliminate preelution staining in preparative electrophoresis, and improve accuracy. Standards are available in low- and midrange kits and as individual standards. Diversified Biotech 424

Software Molecular weights Software package performs almost instantaneous Zimm plots on-screen using data produced by the Dawn laserlight-scattering instrument. Developed for IBM PCs, -XTs, -ATs, and compatibles, it displays the numerical and graphic aspects of the Zimm plot and allows the user to choose different order polynomials for extrapolating the Zimm plot curves. Wyatt Technology 425 Data transfer AA data communications package facilitates automatic transfer of data between SpectrAA series AA spectrometers and a range of computer systems, including the IBM PC, -XT, and -AT; DEC Rainbow and VAX; HP-110 and HP-150; Wang PC; and the NEC APC. Operators can choose how much information to transfer and whether to send data on-line or as a summarized batch report. Varian 426