A human melanoma was cultivated in tissue culture chambers on coverslips, under strips of dialysis cellophane. I t was found with phase contrast microscopy that cells emigrating from these cultures contained a Golgi complex and forms suggestive of the endoplasmic reticulum. Both of these observations are documented with photographs and discussed with respect to findings in melanomas by electron...

It is demonstrated that the isoelectric concentration of ThCl(4) is much greater for electroosmosis in small-pored membranes (cellophane, collodion) than for electrophoresis of particles of the same material. An explanation for the difference is advanced, based on the influence of the small pores in preventing complete development of the electrical double layer.

Electrochemical and electrokinetic characterizations of cellophane membrane samples have been carried out by measuring membrane potential, salt diffusion, and tangential streaming potential, which allow the determination of different characteristic membrane parameters. Experiments were made with the membrane samples in contact with NaCl and NaNO(3) solutions at different concentrations and unde...

The inception of this investigation is an exam ple of serendipity, a word recently popularized to designate the faculty of accidentally making ob servations or discoveries which were not originally sought. In the present instance, a safe antihyper tensive compound was being sought among the quinones to reduce the high blood pressure pro duced by wrapping one or both kidneys of rats with celloph...

Colonies of Streptomyces coelicolor growing on cellophane and impression preparations from sporing colonies were stained for chromatin by the methods of Feulgen, DeLamater (1951), and Piéchaud (1954). The chromatinic bodies of the substrate hyphae have a great variety of configurations. During the development of the spores, elongated chromatinic structures in the young aerial hyphae separate in...