Abstract: A DNA sequence transcribing method involves labeling a DNA fragment with a fluorescent substance, subjecting the labeled fragments to electrophoresis, exposing a gel containing the DNA fragment to light during electrophoresis, and detecting fluorescence generated upon exposure. An image corresponding to a fluorescent image on the gel is transcribed on a recording medium by entering a detecting signal in synchronization with operation of detecting fluorescence on the gel containing the DNA fragment after electrophoresis. This arrangement enables a crude fluorescent image on the gel containing the DNA fragment to be recorded as an intact image of the DNA sequencing on the basis of the fluorescent method, and the image can be retained.

Abstract: A recorder pen is mounted on the sample scanning stage of an electrophoretic sample analyzer. Movement of the stage scans the sample optically while, at the same time, the recorder pen produces an analog record of the optical analysis. A sample holder is mounted in the stage for detented movement in the direction orthogonal to the scanning motion of the sample stage. The sample holder can be moved to one of several detented positions so that different tracks of the samples are scanned.

Abstract: A data derandomizer for use in a scintillation imaging system. The imaging system produces data signals representing radiation events and presents them to a continuously operating video tape recorder for recording and subsequent playback to an imaging apparatus. The recorder can accept the data signals only in discrete time slots. The digital signals are produced in response to radiation events occurring randomly in time and therefore also occur at random time intervals. A data stacking circuit provides for receipt and simultaneous storage of several data signals between the detector and the recorder, the storage being in priority levels according to the order of occurrence of the data signals. Inventory control circuitry controls the stacking circuit to present the data signals to the recorder synchronously with the time slots, notwithstanding the random occurrence of the data signals.