PILOT CHEMICALS, INC

simple and fast, gives excep- tionally high yieldsof very pure peptides free from by-products and withoutappreciable racemization. Also available ...
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PROGRAM photometric Determination of Thallium. L. Hargis, D . F . Boltz, Wayne State University, Detroit 2, Mich. 3:20 An Improved Chloranilate Method for the Determina­ tion of Boron. D . R. Peterson, J . R. Hayes, T h e Pennsyl­ vania State University, University Park, P a . 3:40 Precision Analysis of High Purity Bismuth Telluride by Differential Spectrophotometry. A. Eldridge, R. S. Kelly, R. Bastian, Republic Aviation Corp., Farmingdale, L. Ι., Ν . Υ. 4:00 Indirect Ultraviolet Spectrophotometric Determination of Ammonia. James Howell, D . F . Boltz, Wayne State Uni­ versity, Department of Chemistry, Detroit 2, Mich. 4:20 A New Technique for the Study of Photometric Preci­ sion. D . C. Nelson, R. C. Hawes, Applied Physics Corp., 2724 S. Peck Rd., Monrovia, Calif. 4:40 A Study of a N e w Spectrophotometric D a t a Acquisi­ tion System. R. N . Rand, B . Helm, Bausch & Lomb, Inc., Rochester, Ν . Υ.

and H . P . Smith, Continental Oil Co., Drawer 1267, Ponca City, Okla. 4:10 Proton and Carbon-13 N M R of Coal Derivatives a n d Other Carbonaceous Materials. H . L. Retcofsky and R. A. Friedel, U. S. Bureau of Mines, 4800 Forbes Ave., Pittsburgh 13, Pa. 4:30 T h e End Group Analysis and Number Average Molec­ ular Weight Determination of Some Polyalkylene Glycols and Their Esters Using Nuclear Magnetic Resonance Spec­ troscopy. T . F . Page, Jr., Warren E . Bresler, Battelle M e ­ morial Institute, 55 King Ave., Columbus 1, Ohio. 4:50 A N e w Type E S R Spectrometer. M . Takeuchi, T . Miyamae, Japan Electron Optics Laboratory Company, Ltd., 1418 Nakagamicho, Akishima, Tokyo, Japan. 5:10 E S R Observations of Oxidation-Reduction Process in Some Viscera. Tetsuo Okabe, Hitachi, Ltd., Katsuta-shi, Ibaraki-ken, Japan, P . Y. Sakagishi, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan.

SYMPOSIUM ON HIGH RESOLUTION NMR OF ORIENTED MOLECULES; NMR AND ESR SPECTROSCOPY

TUESDAY, MARCH 3

Monday Afternoon—Terrace R o o m

ANALYSIS OF INTERSTITIAL ELEMENTS IN METALS R. J. Kurland and J. D. Burke, Presiding

l :30 NMR of Polar Molecules in an External Electric Field. J. S. Waugh and J. D . Macomber, Massachusetts Institute of Technology, Cambridge, Mass. 2:10 H i g h Resolution N M R Spectra of Molecules in a n Ap­ plied Electric Field. K . A. McLauchlan, National Physical Laboratory, Teddington, Great Britain. END OF SYMPOSIUM 3:10 Conformation of Sugars and Glucose Polymers by Proton Magnetic Resonance. C. A. Glass, U. S. Department of Agriculture, 1815 North University St., Peoria, 111. 3:30 A Nuclear Resonance Study of Equilibria in the Sys­ tem Boron Trifluoride-Methanol. S. Brownstein, National Research Council of Canada, Ottawa, Ontario, Canada. 3:50 N M R Study of Isomeric Pentadienes. P . W . Flanagan

Tuesday M o r n i n g — B a l l Room L. C. Pasztor, Presiding

9:00 Cooperative Testing P r o g r a m s on Gases in Metals. T. D . McKinley, E . I . du Pont de Nemours & Co., Experi­ mental Station, Wilmington 98, Del. 9:20 Separation and Identification of Impurities in H y drided Uranium Zirconium Alloy. L. Silverman, D. J. Klein, Atomics International, Canoga Park, Calif. 9:40 Rapid Determination of Nitrogen in Refractory Borides and Nitrides. J. W. Tereshko, Union Carbide Corp., P. O. Box 191, Fostoria, Ohio. 10:20 T h e Rapid Determination of Low Concentrations of Oxygen in Potassium and NaK by a Modified Amalgamation Technique. G. Goldberg, Oak Ridge National Laboratory, P. O. Box X , Oak Ridge, Tenn. 10:40 Determination of Carbon and Carbon Compounds in

With Your Existing Monochromator . . . A Superior Spectrophotometric System at Moderate Cost

(1) Monochromator in circuit with (2) Gilford Model 205 transistorized Light Source Stabilizer for both hydrogen and tungsten lamps and (3) Model 220 direct-reading linear Absorbance Indicator. . .a stable, wide-range system for spectrophotometry.

In combination with the high quality optical system of your present monochromator, advancements in Gilford Instruments provide an unsurpassed spectrophotometric system at lower cost. Detailed specifications on request. Direct Digital Reading in Absorbance from 0 to 3 Units. Simplified operation elimi­ nates sensitivity and shutter adjustments. No dark current balance. Unaffected by humidity. No Dessicant. Light output fluc­ tuation less than ±0.001 O.D. Operates on standard line, voltage. No batteries.

gilford INSTRUMENT

58 A

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L A B O R A T O R I E S I N C O R P O R A T E D OBERLIN Circle No. 174 on Readers' Service Card

ANALYTICAL CHEMISTRY

A new Peptide-former

N-ETHYL-5-PHENYLISOXAZOLIUM3'-SULF0NATE (Woodward's Reagent K) Woodward's Reagent K, manufactured by PILOT, functions as a peptide bond former by combining with the acid group of one amino acid or peptide to form an active ester. This ester bond is then broken by the amino group of a second amino acid or peptide ester with concurrent formation of a peptide and a water-soluble by-product. The new procedure is simple and fast, gives excep­ tionally high yields of very pure peptides free from by-products and without appreciable racemization. Also available from PILOT are synthetic polypep­ tides. For more information, write to 591-A.

P I L OT CHEMICALS, INC. 36 Pleasant St., Watertown 72, Mass.

2 OHIO Circle No. 193 on Readers' Service Card