SEARCHING SEARCHING SEARCHING FOR FUNGUS?
AC
BRIEFS
Exchangeable Injection Port Cartridge for Gas Chromatographic Determination of Volatile Substances in Aqueous Fluids GERHARD FREUND, Department of Medicine, University Florida College of Medicine, Gainesville, Fia. 3260I
of
Anal. Chem. 39, 545 (1967)
FOR BACTERIA?
FOR THE PERFECT MEMBRANE?
We've got the perfect membrane—α new presferilized membrane. • Preautoclaved—resectable—reautoclavable • GA-4 . . . GA-6 in packs of 10 mem branes and 10 adsorbent pads. • 47 mm diameter . . . gridded for ac curate counts. • Green membranes, easier on the eyes. White, for specific growth media.
Rapid Sonication Technique for Liquid Scintillation Counting of Carbon-14-Labeled Barium Carbonate J O H N B. ALLRED, Department of Chemistry, Oklahoma University, Oklahoma City, Okla.
Anal. Chem. 39, 547 (1967)
Nitrogen Analysis of Nitrate Esters by Micro-Dumas Combustion
GA-4 0.8 micron pore size GA-6 0.45 micron pore size
P. BORDA and L D. HAYWARD, Department of University of British Columbia, Vancouver 8, Canada BOX
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ANN AMOR,
MICHIGAN
Chemistry,
Anal. Chem. 39, 548 (1967)
GELMAN INSTRUMENT COMPANY P.O.
City
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PARR
HYDROGENATION APPARATUS
Qualitative Detection of Boron via a Crystalline Derivative GEORGE VOGEL, Department of Chemistry, Chestnut H i l l , Mass. 02167
Boston College,
Anal. Chem. 39, 549 (1967)
Spectrophotometric Assay of the Triphenylmethyl Group ROBIN M. SAUNDERS and HENRY P. SCHWARZ, Biochemistry Department, Philadelphia General Hospital, Philadelphia, Pa., and J O H N C. STEWART, Twyford Laboratories, Twyford Abbey Road, London, England For catalytic reduction, condensation and other reactions with hydrogen at pressures up to 5 atm. (60 psig.) in 250 or 500 m l . glass bottles. Also available in a larger unit with interchangeable 1 and 2 liter bottles. Write or phone ( 3 0 9 ) 762-7716 for the latest issue of Spec. 3900 describing the recently improved models of this widely used hydrogenator.
PARR INSTRUMENT 211 Fifty-Third St.
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Moline, Illinois 6 1 2 6 5
Anal. Chem. 39, 550 (1967)
Anomalous Calibration Curves in Gas Chromatography of High-Boiling Compounds M. M. E. METWALLY, C. H. AMUNDSON, and T. RICHARDSON, Department of Food Science and Industries, University of Wis consin, Madison, Wis. Anal. Chem. 39, 551 (1967)
Circle No. 69 on Readers' Service Card 16
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ANALYTICAL CHEMISTRY
