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NMR charts are updated to coincide with the newest in strument techniques: Fourier Transformation HeteroDecoupling, and Time Averag ing. •
I R C H A R T S : Full line of IR charts for most popular in struments.
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GENERAL RECORD I N G C H A R T S : We carry a full line of general recording charts for most standard recorders.
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Vitamin B-12—Total Synthesis Listen t o Dr R. B. W o o d w a r d describe his dramatic work
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Vitamin B-12—Biological Aspects International experts discuss bio chemistry, biosynthesis, and mecha nism of action
—other Science Symposia on Tape also available from ACS— D
The Energy Crisis Outlook for oil, gas, coal Π Fuels for the Future—Hydrogen Experts discuss solutions t o the energy crisis D Nutrition & Public Policy— Food Quality Govt,, industry officials spell it out Π Chemical Engineering In Medicine —at the frontier of chemical engi neering Π Drugs Affecting Learning & Memory A hot topic in drug research
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Analysis of a p h a r m a c e u t i c a l p r e p a r a t i o n Column packing: LiChrosorb SI 60
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PIONEERS IN ACCESSORIES AND ^SUPPLIES FOR SPECTROSCOPY.
Name-
LiChrosorb^ LiChrosorb — t o t a l l y p o r o u s H P L C c o l u m n p a c k i n g s of irregular shape L i C h r o s o r b SI 60 L i C h r o s o r b SI 100 L i C h r o s o r b Alox Τ L i C h r o s o r b SI 60 s i l a n i z e d m e a n particle sizes: 5 μπι, 10 μιη, 30 μπι LiChrospher™ LiChrospher — totally porous H P L C c o l u m n p a c k i n g s of spherical shape L i C h r o s p h e r SI 100 L i C h r o s p h e r SI 500 L i C h r o s p h e r SI 1000 m e a n p a r t i c l e s i z e 10 μπι EM also s u p p l i e s P E R I S O R B * a porouslayer column p a c k i n g m a t e r i a l for high s p e e d a n d high r e s o l u t i o n LC.
EM Laboratories, Inc. Order from : American Chemical Society 1 1 5 5 16th Street, N.W. Washington, D C 2 0 0 3 6 ATTN: A Poulos
CIRCLE 254 ON READER SERVICE CARD 1028 A · ANALYTICAL CHEMISTRY, VOL. 46, NO. 12, OCTOBER 1974
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