An approach is provided for determining a communication session established between at least one first device of at least one first user and at least one second device of at least one second user, wherein the at least one first device and the at least one second device are in a collaborative context detection relationship. Also described are antimicrobial genes and their expression products from various microbial genomes that were found using this method. Moreover, the powders, as prepared, possess good aerosol properties, which are maintained upon storage. A node refers to any one of the radio network node, the wireless device and the positioning node. The isolator mount system is preferably configured to shift frequencies at predetermined displacements upon impact, at or before the system attains resonance. The invention also provides a process for producing the polypeptide encoded by MATKV.