The chloride retention of an alumina catalyst over the course of operation and regeneration can be controlled and stabilized by incorporating a small amount of a component selected from the group including phosphorus, boron, titanium, silicon, and zirconium. A method of operating a host in the interface system includes coupling the bus to the SD card while a first mode is enabled, coupling the bus to the SDIO card while a second mode is enabled, and enabling the first mode in response to a request for access to the SD card. The suspended microstructure includes a plurality of metal layers, at least one dielectric layer, and at least one peripheral metal wall. The common electrode in an upper layer is provided with a plurality of slits. The invention further provides methods of detecting agonists and antagonists of G protein coupled receptors by utilizing FRET.