Princeton Applied Research Corporation

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<ul><li><p>1HE High Frequency Lock-in Amplifier from 1HE Leaders in Signal Processing Technology </p><p>O N L Y the 5 2 0 2 can prov ide y o u w i t h : </p><p> 0 0 k H z - 5 0 M H z ope ra t i on * 10 \ / fu l l -scale (FS) sens i t iv i ty </p><p>2 0 0 0 : 1 d y n a m i c reserve * Two-phase ope ra t i on ' O p t i o n a l Vector /Phase o u t p u t ; O p t i o n a l A / B , log A or log </p><p>A / B o u t p u t </p><p>F ind ou t now how the Mode l 5 2 0 2 can s i m p l i f y , solve or s t reaml ine y o u r h igh f r equency measurement p rob lems . </p><p>Wr i te or call t o d a y f o r more i n f o r m a t i o n . P r ince ton A p p l i e d Research C o r p o r a t i o n , P.O. Box 2 5 6 5 , P r i nce ton , New Jersey 0 8 5 4 0 ; p h o n e : 6 0 9 / 4 5 2 - 2 1 1 1 . </p><p>PRINCETON APPLIED RESEARCH </p><p>Circle 175 For Add i t i ona l I n fo rma t ion Only Circle 176 To Have a Salesman Call </p><p>Thermolyne's Type 2200 Hot Plates can accommodate several vessels and del iver precisely control led, uniform heat to each of them. Demand-type thermostat senses any change in" plate </p><p>temperature and responds with full power. Your best buy for big or mult iple heating jobs. </p><p>Contact your Lab Supply Dealer or write to: </p><p>SYBRON Thermolyne Thermolyne Corp., a subsidiary of Sybron Corp., 25SS Kerper Blvd.. Dubuque, !A S2001 </p><p>To get the most out of a large top surface </p><p>...you must have uniform heat </p><p>Books </p><p>view the principles of lasers, nonlinear Raman effects, infrared fluorescence, and tunable infrared lasers. Section contains six articles on experimental methods such as Fourier transform spectroscopy, matrix isolation, techniques for studying highly reactive species and high-temperature species, trace analysis by infrared spectroscopy, and resonance Raman spectroscopy. The seven articles in Section C on theoretical methods cover isotope substitution, analysis of infrared bands of different intensities and different contours, and force constant calculations. The last section on applications of infrared spectroscopy to solving problems in molecular structure contains eight articles devoted to a review of vibrational spectra of solids, transition metals, metal carbonyls, rc-alkane and polyethylene compounds, polymers, nucleic acids and proteins, and some model compounds of heme proteins. </p><p>Analytical and Quantitative Methods in Microscopy. G. A. Meek and . . Elder, Eds. 276 pages. Cambridge University Press, 32 East 57th St., New York, N.Y. 10022. 1977. $24.95, hardbound; $8.50, paperbound </p><p>This seminar series was initiated by the Society for Experimental Biology to aid research biologists. The aim is to acquaint the traditional biologists, accustomed to dealing only in qualitative aspects, with the recent analytical methods that can be applied to established techniques of microscopy to obtain accurate quantitative information. Topics of 13 chapters are: introduction, stereology, optical diffraction analysis of periodically repeating biological structures, quantitative fluorescence microscopy, quantitative image analysis, integrating micro-densitometry, scanning microinter-ferometry, potential of the scanning transmission electron microscope in biology scanning transmission electron microscopy at high resolution, microanalysis of biological material using electron energy loss spectrometry, energy dispersive x-ray microanalysis, wavelength dispersive x-ray microanalysis in biological research, and the use of ultrathin frozen sections for x-ray microanalysis of diffusible elements. </p><p>Fate of Pesticides in Large Animals. G. Wayne Ivie and H. Wyman Dorough, Eds. + 270 pages. Academic Press, Inc., 111 Fifth Ave., New York, N.Y. 10003. 1977. $14.50 </p><p>The contents of this volume are derived from a symposium on the fate of pesticides in large animals sponsored by the Pesticide Chemistry Division of </p><p>CIRCLE 204 ON READER SERVICE CARD </p><p>380 A ANALYTICAL CHEMISTRY, VOL. 50. NO. 3, MARCH 1978 </p><p>AN EG&amp;G C O M P A N Y </p></li></ul>

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