Graph transformations are used by a data management system to correct violations of service-level objectives in a data center. The electrochemical conversion cells are configured to communicate with first and second reactant supplies. The switch module housing structure may include one or more recesses in which electrical components are mounted. The floating gate is arranged between the word line and the erase gate. The processing device comprises at least one collecting device for receiving bottles delivered to it and for loading several mobile intermediate supports with said bottles, as well as at least one magazine for the intermediate storage of full andor empty intermediate supports. The invention further provides a method for diagnosing a bone disease comprising measuring the level of expression of the Fhl2 gene.