The first report of the biological production of bromo ochratoxin B by Aspergillus ochraceus Wilh. is presented as well as a study of the influence of potassium bromide, potassium iodide, potassium fluoride, and potassium chloride on the production of ochratoxin A and ochratoxin B. Potassium fluoride and potassium iodide inhibited the growth of the fungus, whereas potassium chloride substantial...

The inward transport of potassium by separated dog erythrocytes has been studied at concentrations of potassium in the medium from 2.9 to 25.0 m.eq./liter and at 38.0 and 33.0 degrees C. At the physiological concentration of external potassium (4.06 m.eq./liter medium), the inward potassium flux is 0.11 m.eq./liter cells hour and the glucose consumption is 2.0 mM/liter cells hour. The dependenc...

Male Wistar rats were made potassium-deficient by feeding a diet low in potassium, while controls were pair-fed the same diet supplemented with potassium. Four weeks later 10 mg of T-1824 was injected into each rat. It was found that the characteristic granules which accumulate in the renal collecting tubule cells as a result of potassium deficiency were colored blue and that a diminished color...

The relation between the active potassium influx in the human red blood cell and the extracellular potassium concentration does not appear to be consistent with the Michaelis-Menten model, but is adequately described by a model in which two potassium ions are required simultaneously at some site or sites in the transport mechanism before transport occurs. The same type of relation appears to ex...

Functional regulation of potassium currents in developing neurons is pivotal for changes in excitability and action potential waveform. Here, we test whether an excess of potassium channel transcripts is sufficient to drive functional expression of potassium current and shortening of the duration of the action potential. Injection of Shaker-like potassium channel transcripts into two-cell stage...

In 1942 Winkler and Smith (1), studying the simultaneous renal clearances of exogenous creatinine and potassium in dogs following the injection of potassium salts, concluded that potassium is normally filtered at the glomerulus and subjected to a variable degree of tubular reabsorption. The highest potassium/creatinine clearance ratio obtained by these authors was 0.40. In 1948 Berliner and Ken...

Inherent smooth muscle tone and acetylcholine-induced contractions of the isolated longitudinal muscle from guinea pig ileum are inhibited by 1.2 M ethanol. The inhibitions are antagonized by high concentrations of calcium ion in the external medium. Previous work has indicated that an acetylcholine-induced increase in potassium efflux from the ileal muscle is also inhibited by ethanol and reac...