Voltage differences between memory module power sources and memory controller power sources are corrected for when interpreting data signals passed between memory modules and a controller. These methods and apparatus allow a user to access and make use of electronic media input and output devices by reference to andor utilization of standard printed matter, such as magazines, textbooks, or any other printed matter that can be correlated to electronic media. The viscosifiers have a low content in educts or educt descendants that deteriorate the properties of compositions and considerably reduce or even exclude the formation of high-molecular addition products so that the products obtained have low viscosity and good storage stability. The source and the drain are positioned such that the channel region has a channel width with respect to a surface of the substrate greater than a width of the gate with respect to the surface of the substrate. Furthermore, spot size conversion efficiency is favorable even in a small size. In accordance with a particular embodiment of the present invention the siphon pipe includes a generally rigid, metallic portion disposed adjacent the upper surface of the tank, and a generally flexible portion disposed adjacent the lower surface of the tank.