Quantitative Permeabilitätsbestimmungen

DISCHARGE OF SACCHARASE FROM MYCELIUM OF PENICILLIUM GLAUCUM

“…It has been supposed that in the diffusion of different compounds through the cell wall, the VAN'T HOFF rule is not applicable. It was supposed furthermore, that besides the osmotic permeability there exists "selective permeability" (15), which would permit the diffusion of compounds like sugars and some amino-acids. It has been observed that toxic materials of presumably high molecular weight are put out from cells which contain concentrated solutions of compounds of low molecular weight, but which do not pass out of the cell at all.…”

A history of research on yeasts 11. The study of solute transport: the first 90 years, simple and facilitated diffusion1

“…In a further study, Wieringa showed that chloride uptake from KCl solution was six to seven times faster than the uptake from a solution of the sodium salt200. Figure 5 depicts one set of observations involving KCl (B) and a further set illustrating the time course of urea uptake (A).…”

“…ln[ S o /( S o − S i )] = ( AP / v ) t = kt , where k is a first‐order rate constant. According to Wieringa200, v / A was 0.72 µm; according to Ørskov130, it was 0.55 µm, k being expressed in units of s −1 .…”

“… Observations of uptake by baker's yeast ( Presshefe ) at room temperature published by Wieringa in 1930200. Time of exposure to (A) ∼0.8% (w/v) urea, (B) ∼0.5% (w/v) KCl.…”

The Osmotic Properties of Living Cells (Eggs of Arbacia Punctulata)

“…Ege (6) found that the "disperse phase," b, in rabbit erythrocytes is equal to about 40 per cent of the cell volume, while Wieringa (7) reported that in certain yeasts, the volume occupied by osmotically…”