A process for recovering butanol from a mixture comprising a water-immiscible organic extractant, water, butanol, and optionally a non-condensable gas, is provided. By sampling the signal at different phases of a system clock signal, a determination can be made of when during the system clock signal the signal at a point of interest changed state. , limited, if descent is detected. The specific binding partners, in particular immunoglobulins or fragments thereof, are useful for analysis and functional characterization of proteins encoded by nucleic acid sequences comprising the corresponding genomic DNA fragments or ESTs. The result of inspection is used to set the gain of the variable gain amplifier and further adjust the amplitude of the output signal. The resection plate has a resection surface.