Dynamics of the ion cyclotron resonance effect on amino acids adsorbed at the interfaces.

In this study we show a reproduction of the Zhadin experiment, which consists of the transient increase of the electrolytic current flow across an aqueous solution of L-arginine and L-glutamic acid induced by a proper low frequency alternating magnetic field superimposed to a static magnetic field of higher strength. We have identified the mechanisms that were at the origin of the so-far poor reproducibility of the above effect: the state of polarization of the electrode turned out to be a key parameter. The electrochemical investigation of the system shows that the observed phenomenon involves the transitory activation of the anode due to ion cyclotron frequency effect, followed again by anode passivation due to the adsorption of amino acid and its oxidation products. The likely occurrence of similar ion cyclotron resonance (ICR) phenomena at biological membranes, the implications on ion circulation in living matter, and the consequent biological impact of environmental magnetic fields are eventually discussed.

Rectal administration of sodium valproate in children.

A study of VPA based on a comparison of mean plasma levels, plasma peak latency times and plasma half-lives after rectal and oral administration was conducted in 9 children between 6 months and 10 years of age suffering from various forms of epileptic seizure, before they received chronic VPA treatment. Each child received an oral dose of 20 mg/kg and after two days a rectal dose of 20 mg/kg and the mean plasma concentrations were determined at intervals for both modes of administration. An identical plasma concentration for both after 24 h showed that the quantity of drug absorbed was the same. The mean half-life varied according to age: 11 +/- 2 h for children over 3 years of age and 9 +/- 1 h for those under 3. The results of the study, in line with the few other available published data, thus confirm the validity of rectal VPA administration.