UNEXCELLED FLUORESCENCE, UNBEATABLE PRICE Nothing tops the sensitivity of lumi nescence spectroscopy for measuring pico-to-nanograms of amino acids, hormones, enzymes, nucleic acids, proteins or phenols. And with the Perkin-Elmer MPF-44A fluorescence spectrophotometer, you get the high performance sources at a price you can afford. The MPF-44A handles practically any research situation. It has a wavelength range from 200-1200 nm, resolution of 0.2 nm, and the sensitivity to detect picogram/ml concentrations of quinine sulfate. It's the newest addition to the line that made Perkin-
Elmer the acknowledged leader in fluorescence performance. Two new microprocessor-based accessories. One gives you corrected excitation and emission spectra. The other, the Differential Corrected Spectra Unit, adds differential (double-beam) operation without sacrificing sensitivity.
A new ultra-micro flow cell acces sory with 20 μ\ sample capacity con verts the MPF-44A into an extremely sensitive, versatile LC detector. Other accessories let you select TLC, low temperature luminescence (phos phorescence), polarization, and solid sampling (front surface viewing). If you have any questions on a specific application for the MPF-44A, call us now at (203) 762-4379. Or for full details, write Perkin-Elmer Corp., Mail Station 12, Main Ave., Norwalk, CT 06856.
PERKIN-ELMER
CIRCLE 173 O N READER SERVICE CARD
NEW... A specific guide to RCA Photomultiplier tubes. New required reference — a catalog that is a prac tical working tool for engineers and scientists. It will keep you up-to-date on the latest in photomultiplier tubes, including electron multipliers; plus, for the first time, complete information on sockets, magnet ic shields and power supplies. Specifications on 118 different types — provides concise information on RCA's line of photomultipliers, auxiliary photomultiplier assemblies (APA's), integrated photodetection assemblies (IPA's), asso ciated photomultiplier components and accesso ries, and electron multipliers. Get your copy now — see your RCA Electro-Optics Distributor, or write: RCA Distributor & Special Products Division, 2000 Clements Bridge Road, Deptford, N.J. 08096. Attn: Sales Promotion Ser vices.
Distributor and Special Products Division 438 A · ANALYTICAL CHEMISTRY, V O L . 4 9 , NO. 4 , APRIL 1977
