NEW PRODUCTS
TUBES IN A TUBE
I m p r o v e d Electron M i c r o s c o p e A recently developed universal specimen chamber makes possible the microscopic study of particles at temperatures from 1400° C. to - 1 4 0 ° C. The microscope is capable of direct electron magnifications of up to 200,000 times. Model ÈMU-3G. RCA, 30 Rockefeller Plaza, New York 20, Ν. Υ. 428
Nuclear-Chicago liquid scintillation chemicals
POPOP P-BIS[2-(5-phenyloxazolyl)]-benzene 5 grams 25 grams 100 grams
ΡΡ0 2,5-diphenyloxazole 25 grams 100 grams
500 grams
Liquifluor* 25X concentrate liquid scintillator (500 ml. toluene solution containing 50 g. PPO + 0.625 g. POPOP) * T M Pilot Chemicals, Inc.
To solve a problem for a major instrument company we draw s e a m l e s s t u b i n g over t w o lengths of capillary tubing to make a tough, flexible, foolproof assembly for transmitting critical pressure changes. Posen & Kline produces Microdrawn* stainless steel and nickel alloy tubing up to % " OD in every conceivable finish, shape, tolerance, and ID to solve your tubing problems . . . s a t i s f y demanding tubing needs. Facts in Catalog 10. Posen & Kline Tube Company, Inc., Box raMHNorristown, Pa.
Variable gradient analyzer uses a sin gle analytical column and a continu ous gradient of buffer solutions to de termine the amino acid composition of proteins, physiological fluids, and tissue extracts by automatic ion ex change chromatography. The eluting buffer is fed from a 1.2-liter, ninechambered gradient-producing de vice. Though only one buffer, pH 2 . 9 1 , and an 0 . 8 M sodium citrate solution are required, the shape of the gradient can be altered by modifying the proportions used in the chambers or by varying the number of chambers used in combination. Analysis of a protein hydrolyzate may be completed in 24 hours using a single sample, and requiring only an hour of operat ing time to prepare the instrument. Bull. VG-6000. Phoenix Precision Instrument Co., 3803 N. 5th St., Phil adelphia 4 0 , Pa. 529
A subsidiary of Handy & Harmon. C o m p a c t Electron M i c r o s c o p e The Jem T-l electron microscope magnifies to 5000X (50,000X with photographic enlargement) with a resolution of 50A. This instrument's electron-optical column consists of a self-biased electron gun operated under a 50 kv. accelerating voltage, a speciCircle No. 178 on Readers' Service Card
PBD, phenylbiphenylyloxadiazole-1, 3, 4 2 grams
Starter Set POPOP, 5 grams PPO, 25 grams Liquifluor, 500 m l .
Scintillation Standards SK-4 Set consists of two unquenched samples—carbon-14 and tritium—and a blank. Prepared in our own standards laboratory. W r i t e for details and prices of these and other scintillation products. Ask for new bulletin, "Scintillation Chemi cals." A l s o available on request are Technical Bulletin No. 11, " H o w to Prepare Samples for Liquid Scintilla tion Counting,"and Technical Bulletin No. 13, " H o w to Determine Efficiency Automatically in Liquid Scintillation Counting." NUC:G- 2-262
nuclear-chicago CORPORATION
351 E. Howard Ave. Des Plaines, Illinois Telephone: 312-827-4456 Circle No. 181 on Readers' Service Card VOL. 34, NO. 11, OCTOBER 1962 ·
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