An unusual behavior of strain HeLa cells in tissue culture

An improved organ culture method for adult mammalian lung

An improved method for maintaining adult rat lung in submerged organ culture is described in which the alveoli were inflated with agar and 200-micron-thick hand-cut sections were mounted in Rose chambers. The conventional single-compartmented Rose culture chamber was modified by adding a second chamber separated from the first by a gaspermeable membrane. One compartment functioned as an air reservoir and the other housed the explants submerged in nutrient medium. Visking dialysis membrane used underneath the explants prevented cell outgrowth and facilitated the exchange of nutrients and waste products at the glass-tissue interface. Because of the excellent optical properties of the Rose chamber and the thinness of the explants, individual cell types can be identified in the living tissue. The explants were studied with time-lapse cinematography, light microcoscopy, histology, and erythrosine B for dye exclusion. With this modified system the functional life span of the explants was increased from 1 week to 1 month.

The circumfusion system for multipurpose culture chambers. I. Introduction to the mechanics, techniques, and basic results of a 12-chamber (in vitro) closed circulatory system

A self-contained mechanical system for circulating nutrient fluid through 12 tissue culture chambers is described in detail. This system utilizes nonperforated cellophane membranes in the chambers which separate the circulating nutrient from the tissue culture environments. The nutrient, therefore, is dialyzed through the cellophane of each chamber; some cell products are retained in the microenvironment between the closely apposed cellophane and cover slip, whereas the other cell products move from chamber to chamber in the circulating nutrient. The resultant environmental conditions directed by the circumfusion systems are highly favorable for maintaining the differentiation of chick embryo tissues over protracted periods; a number of micrographs are shown.