automates Southern procedure. Reduces electrophoresis and transfer to 4 hours.

Oncor’s new Probe TechTM 1 automates elec- trophoresis and transfer of DNA to a 4-hour process. The system integrates electrophoresis, depurination, denaturation, and transfer into one procedure to maximize hybridization throughput.

Because of the automated procedure, learning how to use the Probe Tech 1 takes only a few hours. There is minimal sample handling, allowing the system to produce reliable and repeatable results from DNA samples as small as 100 base pairs to over 25,000. Oncor Probe GradeTM rea- gents are available with the system.

For more information contact

w Oncor, Inc. at P.O. Box 870, Gaithersburg, MD 20877.

8 Telephone: (301) 963-3500.

GENESCRIBE-ZTM & T7 RNA POLYMERASE

United States Biochemical introduces Gene- Scribe-ZTM, the most versatile and advanced transcription kit for producing high-sensitivity RNA probes. The kit contains four new vectors (D. Mead and 6. Kemper, in preparation) which combine the featuresof both pUC plasmid and Ml3 phagevec- tors with the ability to use T7 RNA polymerase to produce RNA transcript other applications. Also included is a generous supply of cloned T7 RNA polymerase (first Introduced by USB in 1984), all necessary E. co/i and phage strains, and a complete protocol booklet. For additional informa- tion contact United States Biochemical Corporation at 800-321-9322.

Ten-Chamber Microincubator For 8 x8 cm Membranes

Hoefer’s IO-chamber Mighty Small Deca-Probe” can stain 10 separate immunotransfers on an 8 x 8 cm membrane which remains intact for side-by- side comparison of sample lanes after incubation. Reagents are in- troduced and re- moved through small oval ports; and reagent re- quirements are minimal - about 2-3 ml per cham- ber. Telephone 800-227-4750.

m

New Large-Capacity Fraction Collector The new Retriever@ IV fraction collector features large capacity (to 286 tubes), yet is just 32 cm wide. You can collect by time, drops, or volume. An optional adapter allows collection from up to 20 sources for DNA alkaline elution, cell perfusion, and special LG. Isco, Inc., P.O. Box 5347, Lincoln, NE 68505.