An optical parametric circuit for separating an input signal light and a wavelength-converted light even when the wavelength difference is small is provided. RSSI values are detected from a plurality of receiving circuits of a wireless module, respectively, and a computer judges whether or not there is a significant difference between a first RSSI value detected from one receiving circuit and a second RSSI value detected from another receiving circuit. Under the contact conditions, if the reference nucleic acid and target nucleic acid are identical, branch migration is capable of going to completion resulting in complete strand exchange. The approach may include the use of a vacuum capillary pickup tool to align and position the beam element. Biological reduction of COD, BOD, nitrogen and phosphorous are achieved. 5 mm larger than the second diameter.