FOR THINGS ULTRAVIOLET call on the specialist NEW high intensity 280 nm lamp measures proteins. Miniature PENRAY® lamps calibrate photometers in space, sterilize devices in the laboratory. CHROMATO-VUE® darkrooms help diagnose afflicted children, analyze food impurties, help in the fight against cancer. BLAK-RAY® ultraviolet meters assure efficiency of germicidal lamps, measure UV dose in mutation studies, establish reproducibility of UV experiments in photochemistry and biological sciences. Every day our products solve similar problems. But then, other people's problems are "our thing." That's why we specialize in ultraviolet. THE BROADEST ULTRAVIOLET LINE HAND LAMPS
Many powerful MINERALIGHT®, BLAK-RAY® models.
PEN-RAY® LAMPS Standard for wavelength calibration.
45/a'-
New Products UltraTip probe operates at nominal frequency of 23 kHz and irradiates up to 140 watts in liquids. The probe uses a magnesium alloy as the front quarterwave matching stub enabling the probe to reach electroacoustic efficiencies as high as 8 5 % . The solid-state generator with wattmeter and ultrasonic probe costs $1380. Wave Energy Systems, Inc. 215-968-3833 443 Lancer Coagulyzer is a totally automatic device for measuring variations in human blood coagulation characteristics. A manual control disengages all automatic functions permitting tests requiring special techniques. The instrument performs prothrombin times with single or combined reagents, and various other factor assays. The turntable will hold 1 to 60 cuvettes; a printout is immediately available. $7550. Sherwood Medical Industries, Inc. 314621-7788 444 Stacked columns extend large-scale gel filtration to any type of Sephadex and Sepharose. Last separation is now possible with bed volumes up to 150 liters, even with the least rigid gels. The company also offers a new type of thin layer apparatus specifically designed for conducting gel filtration experiments in aqueous systems. About $6000 and $180, respectively. Pharmacia Fine Chemicals, Inc. 201-4691222 445 Nonreturnable high-pressure lecture bottles of all compressed gases in the company's specialty gas catalog are available. The 3E1800 Thro-A-Way cylinder measures 2 in. by 1 2 % in., tests at 3000 psi, and has a burst pressure of 12,000 psi. The cylinder is supplied with a needle control valve. J. T. Baker Chemical Co. 201-8592151 446
CHROMATO-VUE H & TRANSILLUMINATORS Fluorescent darkrooms on a table top. UV METERS-Positive check of germicidal lamp output.
P.C.Q.® LAMPS Several intense, cool-burning models.
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ULTRA-VIOLET PRODUCTS, INC. Specialist
in specialty
lamps since 1932
Suite 117 · 5114 Walnut Grove Avenue San Gabriel, California 91778
Biosonic IV ultrasonic probe features an internal heat-sensing circuit to monitor the heat in the probe, transducer assembly, and generator. If operating heating is exceeded, the generator automatically shuts down; cooling fans operate, and the generator is switched back when circuitry is cooled. The unit has 300 watts of acoustical power and dual power ranges. It is portable and a full range of accessories are available. $1095. Bronwill Scientific, Inc. 716-254-4810 450 Model 417 skin chloride measuring system consists of sweat induction by pilocarpine iontophoresis and sweat chloride measurement by specific ion electrode. Each analysis requires only five min and about 50«i worth of supplies. Chloride level is read directly off a meter in milliequivalents per liter. $695. Orion Research, Inc. 617-8645400 451
Vitroller monolayer culture system will accept nine new disposable roller vessels per drum, nine 110-mm diam vessels, 240 mm to 370 mm in length, 17 75-mm diam vessels or 34 51-mm diam vessels. Vessels are held in place by spring clips. Vessel speed ranges from 0.2 to 12 rpm. Wheaton Scientific. 609-825-1400 447 HP Model 9125B plots the output of the company's Model 9100A/B desktop calculators 2 i / 2 times faster than its predecessor, the Model 9125A. The recorder takes only 400 msec to plot each point. Resolution is 500 points per in. on both axes; plotting accuracy is within 0.03 in. This X-Y recorder plugs into the back of any Model 9100A/B calculator. $2675. HewlettPackard. 415-326-7000 448
Circle No. 186 on Readers' Service Card
126 A ·
Model 224 column monitor measures true linear absorbance over wide ranges of sensitivity. Five optical units operate at 254 nm, 280 nm, or other wavelengths up to 950 nm. Dual-beam optical units have full-scale ranges of 0.1, 0.3, 0.5, and 1.0 od; single-beam, 0.5 and 2.0 od. Three types of flow cells are available. The Model 610 recorder is specifically adapted for this instrument, but any galvanometric recorder with a sensitivity of one mA or a potentiometric recorder with a sensitivity of one volt or better can be used. Prices range from $745 to $1095. Instrumentation Specialties Co. 402-4340231 449
ANALYTICAL CHEMISTRY, VOL. 43, NO. 4, APRIL 1971
Uv monitor is a double-beam, flowthrough uv filter photometer primarily for use as an effluent stream detector in liquid chromatography and for analysis of density gradients. Optional conversion is possible to 280 nm or 254 nm. The unit offers small cell volume (8 /J) and high sensitivity (0.0001 od). 280 nm, $1497; 254 nm, $1457. Pharmacia Fine Chemicals, Inc. 201-4691222 452
