Abstract: The subject invention pertains to a method of binding proteins and double-stranded DNA to the same membrane matrix. The DNA bound to the membrane matrix remains in double-stranded form. The subject invention further concerns an assay procedure for detecting antibodies, such as autoimmune antibodies, in a biological sample that are immunoreactive with the proteins and double-stranded DNA attached to a membrane matrix. The subject invention provides a single assay system that allows for the determination of antinuclear antibody specificities which can be used to aid in the diagnosis and monitoring of autoimmune diseases.

Abstract: A process and apparatus for purifying and concentrating DNA, which has relatively high molecular weight, from test samples containing DNA, for example from human whole blood samples; the collected DNA is of usable volume and concentration, and is of such purity as to permit conventional restriction by a number of enzymes without the need for further purification. The apparatus consists essentially of an agarose gel disc, typically 5 mm. thick by 31 mm. in diameter, immersed in an electrophoresis buffer solution and supported between two 8 micrometer polycarbonate filters in an electric field. Further, the method involves the loading of a suitably treated sample such as blood lysate onto the top face of the agarose gel disc and then applying an electric field. Of the constituent parts of the treated blood, the DNA molecules are the largest with regard to molecular weight. Consequently, their passage through the agarose gel disc, under the force of the electric field, is impeded.

Abstract: A process and apparatus for purifying and concentrating DNA, which has relatively high molecular weight, from a crude mixture containing DNA for example from human whole blood samples; the collected DNA is of usable volume and concentration, and is of such purity as to permit conventional restriction by a number of enzymes without the need for further purification. The apparatus consists essentially of an agarose gel disc, typically 5 mm. thick by 31 mm. in diameter, immersed in an electrophoresis buffer solution and supported between two 8 micrometer polycarbonate filters in an electric field. Further, the method involves the loading of a suitably treated sample such as blood lysate onto the top face of the agarose gel disc and then applying an electric field. On the constituent parts of the treated blood, the DNA molecules are the largest with regard to molecular weight. Consequently, their passage through the agarose gel disc, under the force of the electric field, is impeded.