During the course of an investigation into the excretion of “detoxication products” in the chicken (1) the need arose for a reasonably simple and reliable method for the estimation of “ethereal sulfate” in quantities of 0.1 to 1 mg. of SOa in volumes of some ml. of chicken urine. As none of the methods tried seemed satisfactory in the form described, a modification was developed. It appears tha...

During the course of an investigation into the excretion of “detoxication products” in the chicken (1) the need arose for a reasonably simple and reliable method for the estimation of “ethereal sulfate” in quantities of 0.1 to 1 mg. of SOa in volumes of some ml. of chicken urine. As none of the methods tried seemed satisfactory in the form described, a modification was developed. It appears tha...

Barium sulfate is an inert material used as a radiographic contrast medium during upper gastrointestinal contrast studies for evaluation of patients with dysphagia. Oral barium aspiration is an uncommon but wellreported complication of this procedure. While barium aspiration of small amounts may not cause any symptoms, massive barium aspiration can be life-threatening, particularly in elderly p...

Using Solvent Evaporating and Atomic Emission Spectrophotometric methods, the solubility of Ba (NO3 )2 inwater at 25.0 ° C was determined. Activity coefficients, f+ and f_ of Bat) and N0i(aq) ions in the saturatedsolution at 25.0 ° C were estimated upon the extended Debye —Hiickel theory and then, the constantK'sp =[Ba2+1f+ [NO-3 ]2 f 2 was evaluated. Comparing the value of thermodynamic solubi...

Different samples of purified tobacco mosaic virus show a relatively wide variation in solubility in ammonium sulfate solution. This variation and the type of solubility curve obtained in the presence of varying amounts of solid phase show that the purified virus whether isolated by mild treatment with ammonium sulfate or by ultracentrifugation is not a homogeneous chemical substance but contai...