FUTURE ARTICLES
WighCResolutionÇel Scanning The new U.V. polyfrac allows pushbutton scanning ol polyacrylamide gels for RNA and protein work. Many features not found in spectrophotometers modified for this function are economically provided in the Joyce Loebl Scanner. High resolution, simplicity of operation, and economy are features of the densitometer. A 0.1 mm scanning slit and scanning speed of 25mm per minute provide high resolution analysis rapidly. The U. V. Scanner will easily accommodate purified gels or slabs for scanning unstained RNA at 265nmor 280nm for protein work. Full scale absorbence ranges of 0.5,1.5, and 3.0 are switch selectable. The high level output of 0-10V. proportional to absorbencEi, is compatible with most laboratory chart recorders, although a matching recorder is available. Joyce Loebl offers the highly sensitive and stable scanning densitometer separately or as an integral part of a complete system, including electrophoresis unit and a gel slicer designed to slice very soft gels frozen in dry ice. Slice thickness is adjustable from 0.1mm to 1.0mm in 0.1mm increments. For more information contact: Joyce Loebl & Company, Northwest Industrial Park, Burlington, Massachusetts 01803, (617) 272-2000.
JOYCE LOEBL & COMPANY CUMHUiVT
Reduction of a Matrix Effect in Spark Source Mass Spectrometry Using a Solution Doping Technique R. J. Guidoboni and C. A. Evans, Jr. Determination of Silver in Precipitation Down to 10 'Λ1 Concentrations by Ion Exchange and Neutron Activa tion Analysis J. A. Warburton and L. G. Young Equilibrium and Kinetic Simultaneous Determination of Sulfonephthalein Dye Mixtures by the Method of Proportional Equations G. L. Ellis and H. A. Mottola Spectroelectrochemical Studies of Metal Deposition and Stripping and of Specific Adsorption on MercuryPlatinum Optically Transparent Electrodes W. R. Heineman and Theodore Kuwana Production and Analysis of Special High-Purity Acids Purified by Sub-Boiling Distillation E. C. Kuehner, Robert Alvarez, P. J. Paulser, and T. J. Murphy Thermal Decomposition of Aliphatic Monoamino Monocar boxylic Acids P. G. Simmonds, E. Medley, M. Ratcliff, and G. Shulman Computer Controlled Stopped-Flow Studies: Applica tion to Simultaneous Kinetic Analysis Donald Sanderson, J. A. Bittikofer, and H. L. Pardue Conversational Mass Spectral Retrieval System and Its Use as an Aid in Structure Determination S. R. Heller Simple Gas Chromatographic Apparatus for Deter mination of Sulfur Compounds at the PPB Level in Air F. Bruner, A. Liberti. M. Possanzini, and I. Allegrini Photoelectron Spectra of Phosphorus Halides, Alkyl Phosphites and Phosphates, Orgatiophosphorus Pesti cides, and Related Compounds D. Betteridge, M. Thompson, A. Û. Baker, and N. R. Kemp Ratio Matching: A Statistical Aid for Discovering Generic Relationships among Samples O. U. Anders Determination of Rare-Earth, Yttrium, and Scandium Abundances in Rocks and Minerals by an Ion Exchange, X-Ray Fluorescence Procedure G. N. Eby Computerized Pattern Classification of Strongly Overlapped Peaks in Stationary Electrode Polaroqraphy L. B. Sybrandt and S. P. Perone High Speed Liquid Chromatography of Derivatized Urinary 17-Ketosteroids F. A. Fitzpatrick, Sidney Siggia, and Joseph Dingman, Sr. Peak Boundary Selection in Photopeak Integration by the Method of Covell Kaj Heydorn and Witold Lada Fluorescence Spectroscopy in the H Characterization of High-Boiling Petroleum Distillates J. F. McKay and D. R. Latham Determination of Trace Amounts of Iron(ll) Using Chemiluminescence Analysis W. R. Seitz and D. M. Hercules Elemental Analysis of Single Micrometer-Size Airborne Particulates by Ion Mass Spectrometry J. A. McHugh and J. F. Stevens Microdetermination of Carbon in Ferrous Alloys J. S. Duerr and R. E. Ogilvie Classification of Archaeological Artifacts by Applying Pattern Recognition to Trace Element Data B. R. Kowalski, T. F. Schatzki, and F. H. Stross
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A N A L Y T I C A L CHEMISTRY, VOL. 4 4 , NO. 1 1 , SEPTEMBER
1972
