Mixed Phosphate Research Articles

An investigation of the reaction of UO2(NO3)2 with Na2HPO4 in aqueous solution

The system UO2(NO3)2- Na2HPO4-H2O was investigated by determining the solubility, pH, electrical conductivity and apparent volume of the precipitates. It was found that the reaction in this system takes place in three stages, with successive formation of (UO2)a(PO4), a mixed sodium uranyl acid phosphate UO2HxNa1−xPO4 and, finally, NaUO2PO4·nH20.

The Preparation and Properties of Spheroplasts of Aerobacter aerogenes

SUMMARY: Cells of Aerobacter aerogenes growing in a nutrient medium were lysed by 1000 u. penicillin/ml. When the medium contained penicillin and sucrose, bacterial mass continued to increase on incubation, although no further cell division took place. After growth for 3 hr. in the presence of penicillin, all the rod-shaped bacteria were converted to fragile spheroplasts. The internal osmotic pressure of the spheroplasts was estimated by direct counts of the intact cells in solutions containing various concentrations of sucrose, sodium chloride or mixed phosphates. Measurements of optical densities of suspensions were unsuitable for the estimation of the numbers of spheroplasts. Morphological study suggested the existence of a spheroplast cell wall outside the protoplasmic membrane.

Phosphoric acid treatments for steel. I. The nature of coatings produced by the action of phosphoric acid on steel

AbstractThe nature of the mixed phosphates present in coatings produced by the action of phosphoric acid on a clean steel surface has been investigated. It has been shown that the coating composition changes with time of exposure to atmospheric oxygen. The role of oxygen in the reaction mechanism is discussed.

An experiment for the pH meter

These procedures are designed for a Beckman Model H-2 line operated pH meter and include standardization, measurement of pH, titration curve of phosphoric acid, standardization of base, and analysis of mixed phosphate solutions.

Possible Chemical Nature of Tobacco Mosaic Virus

IN a recent issue of NATURE1 Barton-Wright and McBain give results of experiments on the precipitation of virus from infected tobacco juice. The method they used was that of Vinson and Petre, which consists essentially of the precipitation of the protein and other materials from the plant juice with basic lead acetate and the subsequent removal of the virus by elution with potassium-hydrogen phosphate solution. Barton-Wright found that if the mixed phosphate eluate be acidified to a pH of 5 (which means, in effect, the conversion of the alkaline to the acid phosphate, KH2PO4) and 2 volumes of acetone added, a precipitate is thrown down, which is partly colloidal and partly crystalline. The colloidal material is largely protein in nature and is rich in virus. The crystals also contain virus.

On simple and mixed alkyl phosphates

On simple and mixed alkyl phosphates