Abstract: A porous solid phase for binding assay that enables a test sample such as whole blood to be analyzed promptly, conveniently, accurately, and inexpensively without requiring a pretreatment, and a binding assay method using said porous solid phase are disclosed. At least one surfactant is incorporated into the porous solid phase for binding assay prior to addition of a test sample, the at least one surfactant being selected from the group consisting of (A) a sugar-containing surfactant that comprises a compound shown by a general formula (I), (B) a sugar-containing surfactant that comprises a sucrose fatty acid ester wherein the constituent fatty acid has 5 to 14 carbon atoms, and (C) a steroid surfactant.

Abstract: A porous solid phase for binding assay that enables a test sample such as whole blood to be analyzed promptly, conveniently, accurately, and inexpensively without requiring a pretreatment, and a binding assay method using said porous solid phase are disclosed. At least one surfactant is incorporated into the porous solid phase for binding assay prior to addition of a test sample, the at least one surfactant being selected from the group consisting of (A) a sugar-containing surfactant that comprises a compound shown by a general formula (I), (B) a sugar-containing surfactant that comprises a sucrose fatty acid ester wherein the constituent fatty acid has 5 to 14 carbon atoms, and (C) a steroid surfactant.

Abstract: A concrete block having comparatively light weight and capable of being manufactured easily and used in various fields of application; a block joint for the concrete blocks, capable of carrying out the arrangement of the concrete blocks simply and retaining the arranged concrete blocks in good order; and a structure made by using the concrete blocks and the block joints.

Abstract: A method is provided for the determination of the presence of a reverse transcriptase in a sample liquid. In an aqueous medium, at least an adenine ribopolynucleotide RNA template (poly A), an immobilized oligodeoxythyminenucleotide and a biotinylated deoxyuridine triphosphate are reacted in the presence of the sample liquid. After separation of the reacted and the unreacted biotinylated deoxyuridine triphosphate from each other, the reacted or the unreacted biotinylated deoxyuridine triphosphate is detected. Also provided is a method for the determination of infection of a patient to a retrovirus. The reaction is conducted in the presence of a sample body fluid and the reverse transcriptase. After the detection of the reacted or the unreacted biotinylated deoxyuridine triphosphate, the reverse-transcriptase-neutralizing and/or inhibiting antibody titer in the sample body fluid is determined.

Abstract: A method for a high-sensitivity quantitative analysis of bile acid in a bile acid-containing sample utilizes a reagent comprising:(1) a steroid dehydrogenase which is capable of effecting a reversible reaction producing oxobile acid using bile acid, as a substrate, and a nicotinamide adenine dinucleotide phosphate compound (hereinafter referred to as an NADP compound) or a nicotinamide adenine dinucleotide compound (hereinafter referred to as an NAD compound) as coenzyme;(2) a compound A.sub.1 selected from the group consisting of NADP compounds and NAD compounds, in an amount surplus relative to the amount of bile acid;(3)(i) compound B.sub.1 selected from the group consisting of a reduced NAD compound and a reduced NADP compound, compound B.sub.1 being a reduced NAD compound, when A.sub.1 is an NADP compound, and a reduced NADP compound, when A.sub.1 is an NAD compound, or(ii) a compound B.sub.2 which is an oxidized product of B.sub.1, or(iii) a mixture of B.sub.1 and B.sub.2, where the amount of B.sub.