Abstract: A nucleic acid-bondable magnetic carrier of the present invention is a magnetic silica particle comprising a superparamagnetic metal oxide, wherein the magnetic silica particle has a specific surface of about 100 to about 800 m2/g.

Abstract: The present invention provides a method for detecting nucleotide polymorphism contained in a sample wherein nuclease activity and legase activity are employed at the same time.

Abstract: A method of detecting variation or polymorphism in a nucleic acid sequence, which is useful particularly in diagnosing a hereditary disease, analyzing nucleotide polymorphism, etc., and primers to be used therein. More particularly speaking, this method comprises treating a primer for wild type and one or two primers for variant with DNA polymerase either simultaneously or separately, and detecting the nucleotide polymorphism contained in the nucleic acid sample by judging whether or not the primers are extended, or whether or not the primers are amplified with a reverse primer. In this method, the 3′-end second bases of the primer for wild type and one or two primers for variant correspond to respective nucleotides anticipated in the nucleotide polymorphism site. Further, at least one of the bases from the 3′-end third position to the 5′-end is substituted by a base not complementary to the base in the chain hybridized with the primer in the chromosome or fragment.

Abstract: A nucleic acid-bondable magnetic carrier of the present invention is a magnetic silica particle comprising a superparamagnetic metal oxide, wherein the magnetic silica particle has a specific surface of about 100 to about 800 m2/g.

Abstract: A nucleic acid-bondable magnetic carrier of the present invention is a magnetic silica particle comprising a superparamagnetic metal oxide, wherein the magnetic silica particle has a specific surface of about 100 to about 800 m.sup.2 /g.