Continuous Zone‐Refining Apparatus

Continuous-Culture Apparatus for Long-Term Use1

The continuous production and harvest of uncontaminated cells for periods of several months are a major requirement inthe design of a suitable culture system. Many continuous-culture units have been reported previously (1, 2), and some units are now commercially available. However, in these units, rubber, metals, and other sources of potentially toxic extractives are not prevented from direct c...

An Apparatus for Continuous Oiling of Streams

Continuous Flow Apparatus for Preparing Isotopically Pure He

A He isotopic purification cryostat has been developed, capable of sustained operation in continuous flow. Starting from a feedstock of helium of the natural isotopic ratio, He/He = x3 ≈ 10−7, it yields a purified product for which x3 < 5× 10−13 at a production rate of 3.3 STP m h−1. The isotopically purified He is being used for a variety of applications, including quantum evaporation experime...

A continuous flow apparatus for the study of mixed cultures.

Although a continuous flow technique has been applied to pure culture studies by a number of workers, we are aware of only three reports (Rogers and Whittier, 1930; Savage and Florey, 1950; Zubrzycki and Spaulding, 1957) describing its use with mixed bacterial cultures. The advantages of the chemostat over the usual test tube-petri plate methods were outlined by Braun (1953) and by Novick (1955...

Convenient apparatus for the continuous dehydration of histologic material.

SUAL METHODS OF DEHYDRATING histologic material,such as repeated passages through weak to strong solutions of alcohol, are rather time consuming, and the time lost in the recovery of the solvent has compelled most laboratories instead to discard it after use. Such a practice can amount toenormous expense ofmaterial.Automatic devicesreduce toa minimum the personneland the time requiredfortheirop...