Opening new frontiers with electro optics S e e m o r e with the most sensitive RCA photomultiplier tube. Astronomers a n d spectrosoopists, RCA has 2 " dia.. 11-stage PMTs with the characteristics you need. For critical photon counting applications, the GaAs C31034A has the highest known photocathode responsivity over its entire 200-930 nm spectral range, plus dark noise of only 100 cps max. at - 20°C. You c a n also get lower dark count rates, to 12 cps max. With InGaAs types you get extended spectral ranges, to 1030 nm. These are just a few of RCAs wide line of PMTs for all types of lowlight-level detection systems.
For more information, see your RCA EO distributor, or write: RCA Distributor & Special Products Division, 2000 Clements Bridge Road. Deptford, New Jersey 08096, Attn: Sales Promotion Services.
RCA Electro Optics
trode i m p l a n t s a n d surgical recovery, the rat m a y "decide" to disconnect his l e a d s o r fail in s o m e o t h e r w a y t o c o operate a n d one m u s t begin anew. Nevertheless, t h e results a r e so exciting a n d t h e p o s s i b i l i t i e s s o o p e n t h a t i t seems to us t o be electroanalytical chemistry a t its best! Acknowledgment Any success these studies have h a d is d u e e n t i r e l y t o t h e e f f o r t s of m y s t u dents and coworkers who have had t h e courage a n d d e t e r m i n a t i o n t o begin in this new area. Suggested Readings in CNS Functioning
HotftHeavy Tem-Pres Super Pressure Opposed Anvil Press
R. F. Thompson, "Introduction to Physiological Psychology", Harper & Row, New York, N.Y., 1975. J. R. Cooper, F. E. Bloom, and R. H . Roth, " T h e Biochemical Basis of Neuropharmacology", 2nd éd., Oxford Univ. Press, New York, N.Y., 1974. G. M. Shepherd, " T h e Synaptic Organization of the Brain", Oxford Univ. Press, New York, N.Y., 1974. S. W. Kuffler and J. G. Nicholls, " F r o m Neuron to Brain", Sinauer Associates, Sunderland, Mass., 1976. C. R. Noback and R. J. Demarest, " T h e H u m a n Nervous System", 2nd éd., McGraw-Hill, New York, N.Y., 1975. F. O. Schmitt, P . Dev, and Β. Η . Smith, Science, 193,114(1976). P. Rakic, Neurosci. Res. Program Bull., 13, # 3 , "Local Circuit Neurons". References (1) A. W. Sternson, R. McCreery, B. Feinberg, and R. N. Adams, J. Electroanal. Chem., 46, 313 (1973). (2) R. N. Adams, J. Pharm. Sci., 58,1171 (1969). (3) P . T. Kissinger, C. Refshauge, R. Dreiling, and R. N . Adams, Anal. Lett., 6, 465 (1973). (4) W. Kemula, Rocz. Chem., 26, 281 (1952). (5) R. Keller, A. Oke, I. Mefford, and R. N. Adams, Life Sci., 19, 995 (1976). (6) A. Oke, R. Keller, and R. N. Adams, manuscript in preparation. (7) R. M. Wightman, P . Plotsky, R. Delcore, E. Strope, and R. N. Adams, manu script in preparation. (8) P. Plotsky and R. N. Adams, manu script in preparation. (9) H. J. Spencer, V. K. Gribkoff, C. W. Cotman, and G. S. Lynch, Brain Res., 105,471(1976). (10) P . T. Kissinger, L. J. Felice, R. M. Riggins, L. A. Pachla, and D. C. Wenke, Clin. Chem., 20, 992 (1974). (11) P . T. Kissinger, R. M. Riggin, R. L. Alcorn, and L. Rau, Biochem. Med., 13, 299 (1975). (12) L. J. Felice and P . T. Kissinger, Anal. Chem., 48, 795 (1976). (13) R. M. Riggin, R. L. Alcorn, and P . T. Kissinger, Clin. Chem., 22, 782 (1976). (14) C. L. Blank and R. Pike, Life Sci., 18, 859 (1976). (15) R. L. Pike, C. L. Blank, and W. B. Stavinoha, unpublished data. (16) R. C. Buchta and L. J. Papa, J. Chromatogr. Sci., 14, 213 (1976). (17) D. G. Swartzfager, Anal. Chem., 48, 2189(1976). (18) P . T . Kissinger, J . B. H a r t , and R. N . Adams, Brain Res., 55, 209 (1973). (19) L. C. Clark and C. Lyons, Ala. J. Med. Sci., 2, 353 (1965).
The SJ -100 system consists of the pressure ram and press-frame, mounted on a custom control cabinet. A screw-type pressure generator automatically maintains hydraulic pressure within =1.8 kg/cm2 (25 psi) of gauge pressure, while a thermocouple - activated controller provides power to the sectional furnace that automatically heats the sample area to any temperature level up to 725°F. The console contains coarse and precision pressure gauges and furnace controls.
specialists in high pressure/high temperature research systems
contact R. M Shoff
Leco Corporation Tem-Pres Division 1401 South Atherton Street State College. Pennsylvania 16801 Phone: 814-237-7831
LECO CIRCLE 125 O N READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 48, NO. 14, DECEMBER 1976 · 1137 A
