Now in bead form for chromatography of biologic substances...
NEW PRODUCTS
THERMOLYNE
Sephadex
Laboratory Apparatus for:
Ion Exchangers Because of its advantages —sta bility and inertness —Sephadex has been used to produce a new class of ion exchangers: QAE-, DEAE-, C M - and SE-Sephadex. Since theirintroduction they have been used extensively, particu larly in the biochemical and clin ical field. In the new bead form they will be more useful both for laboratory and m a n u f a c t u r i n g s c a l e p r o c esses. Their spherical shape gives increased mechanical s t r e n g t h and leads to e a s i e r column packing. More uniform p a r t i c l e s r e s u l t in i m p r o v e d hydrodynamic properties. All Sephadex Ion Exchangers have a high capacity and low nonspecific adsorption. They are available in two types that differ in porosity, thus offering flexibility for your specific requirements. Sephadex Ion Ex changers are of analytic grade purity and are produced under rigorous quality con t r o l , t h u s e n s u r i n g u n i f o r m p r o d u c t s to give accurate and reproducible results.
Model experiment with glycogen, glucose, sugar phosphates and adenosine phosphates on a column of DEAE-Sephadex A-25. (From Biochim. Biophys. Acta 7 4 [1963) 5 8 8 , by permission of the author)
Anion Exchangers Grade
Type QAESephadex QAESephadex DEAESephadex DEAESephadex
A-25 40-120)1 A-50 40-120μ A-25
40-120ίΐ
A-50j 40-120)1
Ionic Form CI
-
CI""
Capacity (meq/g)
Bed Volume 1 (ml/g)
3 0 Γ*" 0.4
5-8
30 ±
04
-
3 5 + 0.5
5-9
CI
-
35 + 05
25-33
Type
lomc Form
Capacity (meq/g)
Bed Volume 2 (ml/g)
CMSephadex C 25
40-120w
Na·
4.5 + 0.5
6-10
CMSephadex C-50
40-120μ
Na*
4 5±0 5
32-40
40-120μ
Na*
2.3 Λ 0.3
5-9
40-120μ
Na*
2 3 + 03
30 38
SESephadex C-25 SESephadex C-50
1. In T r i s - H C l buffer. p H = 8 . 3 , ionic strength -— 0.05. 2. In sodium phosphate buffer pH = 6, ionic strength = 0.Q6.
For additional technical information, booklet on Sephadex Ion Exchangers,
including write to:
PHARMACIA FINE CHEMICALS INC. 800 Centennial A v e n u e , Piscataway, N. J. 08854 Pharmacia (Canada) Ltd., 110 Place C r é m a z i e , Suite 412, Montreal 11, P.Q. (Inquiries outside U.S.A. and Canada should be to PHARMACIA FINE CHEMICALS AB. Uoosala.
directed Sweden.;
Circle No. 136 on Readers' Service Card See ACS Laboratory Guide for All Products/Sales Office 132 A
·
ANALYTICAL
CHEMISTRY
Where versatility and modest cost are needed
FURNACE TYPE 1500 is the one. •
G r i n d i n g Vessel
The Potomill is a versatile instru ment featuring three speeds and a built-in timing device for runs of 0-15 minutes. A by-pass switch is provided for long grinding or mixing operations. The instrument can be used for the reduction of almost any material rang ing from quartz and rock, to foodstuff, pigments, and paper. It is ideal for spectroscopy, X-ray diffraction, and powder metallurgy specimen prepara tion. The vessel is available in hardened and stainless steel, agate, or tungsten carbide. Bcckman Instru ments, Inc., Scientific Instruments Di vision, 2500 Harbor Blvd., Fullerton, Calif. 92634 423
•
•
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STEPLESS TEMPERATURE CONTROL Anything from 3 5 0 F / 1 7 7 C to max. re gardless of line voltage and ambient temperature. Easy reading dual scale pyrometer. SPACE-SAVER DESIGN Convenient base-mounted built-in con trols. Holds temperatures accurately and constant. T W O CHAMBER S I Z E S - L O N G & SHORT 4 χ 2% χ 4Vi, or 4 χ 3% χ 9. Hi-Temp heating elements optional. SAFETY DOOR Fits tight but opens readily. Swings up w i t h hot side away. Stays open or clos ed by counter-weighted handle w i t h simple positive movement. N O SCORCHED OR BURNED BENCH TOPS Scientifically designed ventilated base keeps controls and bench tops cool. L O N G LIFE Sturdy steel body, all metal joints w e l d e d , three inches insulation, em bedded heating elements. PRICE
30-40
CI
Cation Exchangers Grade
Model RM-6 Resolution Multiplier au tomatically scans and then multiplies the resolution of curves and continu ous spectra by deconvolution. Its applications include mass spectrom etry, gas chromatography, nuclear magnetic resonance, infrared spec troscopy, and other continuous spec tra producing instrumentation. One unique feature of the RM-6 is that no assumptions or computations need be made regarding solutions being sought and results are not subject to operator interpretation. Micro-Tol Engineering Corp., Box 154, State College, Pa. 16801 422
L o w Level α a n d β C o u n t e r
This instrument provides a quick, simple, and accurate means of measur ing and recording α and low-level β radiation characteristics of radioactive pollution of any surface where such pollution might exist. The instrument virtually eliminates the effects of both background radiation and self absorp tion. A large-area, low-level detector, an ultra-stable high-voltage power sup ply, a triple discriminating amplifier/ac gate, and appropriate line noise filter are included in the instrument. A printer control and printer can be added if digital recording of the results is desired. Philips, P. O. Box 523, Eindhoven, The Netherlands 424
0 ^ HEAT Π LIGHT Π MOTION
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$170.00 to $190.00
ylrW CATALOG 68 Write today for your^free copy 48-Page catalog shows expanded line: furna ces, controls, hot plates, mag. stirrers. Stir - Plates, Stir Lights, Dri-Baths, in cubators, lab-lights, meters. Owner Built furnace ac cessories.
THERMOLYNE CORPORATION 2555 KERPER BLVD. DUBUQUE, I O W A
52001
U.S.A.
a subsidiary of Ritter Pfaudler Corporation Circle No. 86 on Readers' Service Card
