New Products
Self-Cleaning pH Probe Model 8322 can be used in difficult in dustrial environments, such as mea surement of pH in waters containing hydrofluoric acid, oils, fats, and in rubber production, and measurement of redox in effluent detoxication plants. The accuracy of measurement is 0.15 pH from 2 to 12 pH. Average lifetime exceeds two years. Uster Corp. 422
Microprocessor Model 7551 spectral analysis micro processor is designed for use with the quadrupole mass spectrometer. It en ables users of gas chromatographymass spectrometry systems to accu mulate and process spectral data at one-third to one-sixth the cost of a small computer. Scientific Research Instruments Corp. 423
Liquid Chromatograph Model 244 offers precise, reproducible flow rates (0.1-9.9 ml/min), two sensi tive detectors, and increased user con venience. This high-efficiency liquid chromatograph enables the user to separate a wide variety of compounds on either an analytical or preparative scale. Waters Associates 403
A/D Converters The 13-bit MP2713 and the 14-bit MP2714 A/D converters feature lowpower dissipation consistent with ex tremely low noise and high speeds, 0.006% relative accuracy, differential linearity less than 3 ppm/°C, and four full-scale, pin selectable ranges, 0 to 5, - 5 to +5, 0 to 10, and - 1 0 to +10 V. Priced respectively at $309 and $419. Analogic 412
For more information on listed items, circle the appropriate numbers on one of our Readers' Service Cards
PIERCE
Anti-DNA Assay Kit 1-125 labeled kit provides a reliable standardized method for determining anti-DNA antibody activity over a concentration range of 0-100 units/ml in human serum. Amersham/Searle 428
UV Enzyme Kits Eight new UV enzyme kits are based on the most current methodologies for CPK, GPT, GOT, 7-GT, «-HBDH, LHD-L, LDH-P, and triglycerides. All reagents are premeasured, premixed, and lyophilized. User just adds dis tilled water. Kits are available in three package sizes to accommodate test volumes from automated runs to stats. Fisher Scientific Co. 429
Stable Turbidity Standard SNT, an aqueous suspension of plastic beads, is designed to eliminate timeconsuming standardization of nephelometers and turbidimeters with short-lived formazin materials. The beads have a permanent shelf life, function across the entire visible spec trum, and are nonreactive with vessel walls. AMCO Service Co. 430
Somatostatin
SEE WHAT'S GOING ON use Reacti-Vials THE IDEAL CONTAINER FOR Observation of smalt reactions retrieval residues
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Moisture protection ·
M a x i m u m sample ·
Derivative p r e p a r a t i o n
Isolation of ·
Sealed
c e n t r i f u g a t i o n · Sample storage The internal cone shape is ideal where removal of small amounts of material by syringe is desired and is naturally useful in centrifugation, precipitation and solu tion; other signs of reaction progress may be readily observed because of the mag nifying effect of the extra heavy base which also makes the unit stable for bench work without requiring a rack. Ask for our vials and closures brochure which describes Reacti-Vials, other use ful and novet containers and the most complete selection of septa and other closures ever offered. T e f l o n is a trademark of D u P o n t . Reacti-Vial is a trademark of Pierce.
13220 Reacti-Vial 0.3 ml Pkgof 12* $25.75
Chemicals
13221 Reacti-Vial 1.0 ml Pkgof 12" $28.40
PIERCE EUROCHEMIE B.V. P.O.Box 1161, Rotterdam,Holland
13222 Reacti-Vial 3.0 ml Pkg of 12* $30.60
Chester, Cheshire CH1 4EF England
Creatinine Kit The Creatinine Rapid Stat kit con tains reagents and standards for 120 determinations. The test is a singletube procedure, requiring no blank, in which timing is not critical. The same procedure may be used for urine cre atinine or creatine tests after suitable dilution. $19.60. Pierce Chemical Co. 432
/V-Dansylaziridine This new reagent is useful for the qualitative determination of free pro tein thiols and for the fluorescent tag ging of such samples. 100 mg for $7.50. Pierce Chemical Co. 433
Ion-Exchange Supports
13223 Reacti-Vial 5.0 ml Pkgof 12* $32.20
PIERCE &WARRINER(UK)LTD.
The tetradecapeptide somatostatin, the somatotropin release inhibiting factor, is now available in 1-mg ($55) and 5-mg ($220) sizes. Pierce Chemi cal Co. 431
' S h i p p e d in plastic cases of 12, complete w i t h screw caps and Teflon®-faced rubber discs.
PIERCE
ι Boxll^Flockford.lMinois 6 H O S CIRCLE 1 0 6 O N READER SERVICE CARD
876 A · ANALYTICAL CHEMISTRY, VOL. 47, NO. 9, AUGUST 1975
Four Corning supports are available; DEAE, a weak basic anion exchanger; CM, a weak cation exchanger; QAE, a strong basic anion exchanger; and SP, a strong acid cation exchanger. Pierce Chemical Co. 434
