[In the era of the Royal Society of Medicine].

In the May 2013 issue of medecine/sciences, the Rob Laffecteur complained about the constraints imposed by the Société Royale de Médecine in 1779, bearing on the labelling of remedies. Though, he did take advantage of the evaluation from an advertising point of view; though in this prospect he diverted his evaluation's report, in order to present it in a flattering manner. The Société Royale de Médecine was founded in 1778; its mission was to cover everything that had to do with public healthcare.

Dissolution of synthetic hydroxyapatite in the presence of acidic polypeptides.

This article deals with the effect of two acidic polypeptides [polyaspartic acid (PA) and polyglutamic acid (PG)] onto hydroxyapatite (HAP) dissolution by separately considering their influence when they are present only at the HAP interface and when they are both adsorbed and present in the bulk solution. We first determined the amount of adsorbed PA and PG at pH 7.0 and 5.

Development of an automated experimental setup for the study of ionic-exchange kinetics. Application to the ionic adsorption, equilibrium attainment and dissolution of apatite compounds.

An ion-selective electrode and microcomputer-based experimental setup for the study of ionic-exchange kinetics between a powdered solid and the solution is described. The equipment is composed of easily available commercial devices and a data acquisition and regularization computer program is presented. The system, especially developed to investigate the ionic adsorption, equilibrium attainment and dissolution of hard mineralized tissues, provides good reliable results by taking into account the volume changes of the reacting solution and the electrode behaviour under different experimental conditions, and by avoiding carbonation of the solution.

Kinetics of dissolution of calcium hydroxyapatite powder. III: pH and sample conditioning effects.

The kinetics of dissolution of synthetic hydroxyapatite powder (HAP) were studied at 37 degrees C and constant pH in the pH range 3.7-6.9 by continuously recording proton uptake and calcium release.