The invention provides a method for selecting pharmaceutical compounds that enhance inhibition of mevalonate synthesis in which mesodermal stem cells that are derived from human pluripotent cells or from induced stem cell are contacted with pharmaceutical compounds to be tested in the presence of an inhibitor of mevalonate synthesis. When a trouble occurs in any of the sensors other than the pressure sensors among them, a light degree of operation restrictions is performed for restricting a rotational speed of the engine while it can be determined that particulate matter is not excessively accumulated in a particulate matter removing filter from a detection value of the pressure sensors. The systems can be MEMS arrays or other types of devices where stiction related forces occur. In some embodiments, a capacitor is operably coupled to the amplifier output and is configured to provide a frequency compensation for the switching power converter and a charging ramp for the soft start process. If a drive encounters an unrecognized disk control block, the drive can still decode the standard control parameters, so that the drive behavior is not inconsistent with the requirements of the unrecognized disk control block. An interconnected weld containment apparatus pivotally connects to the clamp by use of a cam actuated linear pin.