Compounds that may be used to inhibit histone deacetylase having the formulaZ-Q-L-M or Z-L-Mwherein M is a substituent capable of complexing with a deacetylase catalytic site andor a metal ion; L is a substituent providing between 0-10 atoms separation between the M substituent and the remainder of the compound; and Z and Q are as defined herein. The portable biochemical testing apparatus includes a light source module, a sample module, a photoconductive material layer, a touch module, and a control module. The virtual machine can receive a request to be informed upon completion of execution of the garbage collection software on the computing device via a post up-call. At least a part of the metal wire extended from each of the electrode terminals of the semiconductor elements to the tapered surface is electrically connected to the side surface wiring. The respective order identifiers are updated as transactions are processed.