A call transmitter for the input of control commands, in particular for an elevator installation, has at least one carrier element that can be selectively received in an opening in either end face of a call transmitter housing. The power converter is adapted to be operable in the boundary conduction mode, and operation is interruptible in the absence of any load requirement. A humane method for euthanasia involves administering the composition to animals for which euthanasia is desired. Such computing resources may, for example, include virtual machine instances, virtual machine images, storage volumes, network resources, files, software bundles, etc. The exhaust gas that flows inside the porous tube passes through the metallic foam filter. The doped polysilicon contact line in the CMOS imager decreases leakage from the diffusion region into the substrate which may occur with other techniques for interconnecting the diffusion region with the source follower transistor gate.