A method and apparatus for managing the variable timing of internal clock signals derived from an external clock signal in order to compensate for uncertainty and variations in the amount of read clock back timing relative to data flow to achieve a specified read latency. The light can be pulsed or continuous. A solder is disposed on the plug surface in which the plug can be a cylinder or mushroom-like shape and the solder can be a film or a ball. The image data is scanned and exposed by one line in Y direction. The first element may be a channel layer. Methods of synthesizing LML using immobilize lipases and various solvents are also provided.