Abstract: A nucleic acid information processing device includes a storage unit that stores first base sequence information including information on a plurality of base sequences, and second base sequence information including information on a plurality of base sequences; a threshold value receiving unit adapted to receive information that identifies a similarity threshold; a hybridization unit adapted to identify a degree of similarity and a starting position and a finishing position of a similar portion for one to one combinations with the base sequences included in the first base sequence information as a target, and the base sequences included in the second base sequence information as a probe; and a similar base sequence counting unit adapted to count for each probe a number of the targets for which the identified degree of similarity is greater than or equal to the similarity threshold, and storing the count in the storage unit.

Abstract: The object is to provide a novel organism identification method which can be used as an alternative method to a conventional organism identification method which utilizes DNA and requires enormous labor. Developed is an organism identification method for determining whether or not an organism of interest is identical to a specific organism or a progeny thereof, which is characterized by introducing a DNA tag(s) in advance into a cell(s) of the specific organism, or a parasite or a symbiont with the specific organism, and determining whether or not the organism of interest is identical to the specific organism or a progenitor thereof based on the detection or non-detection of the DNA tag in DNA extracted from the organism of interest, or the parasite or the symbiont with the organism of interest.

Abstract: There is provided a method for the detection of a base sequence of interest when amount of a sample DNA or RNA is little and plural base sequences of interest to be detected are present in the sample DNA or RNA. The Problem is solved by a method for the detection of an base sequence of interest in a sample DNA or RNA comprising the steps of (1) contacting a sample DNA or RNA to a probe DNAs or RNAs in an aqueous solution to form a hybridization complex; (2) isolating the hybridization complex; (3) dissociating the complex to recover the probe DNAs or RNAs; and (4) identifying the said probe DNAs or RNAs to detect an base sequence of interest in the sample DNA or RNA.