Abstract: The present invention provides a method for inactivating RNase which generally presents in a sample such as biological sample (especially an excrement sample), or in a sample such as a living body-derived sample (especially an excrement-derived sample) obtained by separation of an RNA-including body therefrom or the like; a method for extracting and detecting RNA from the sample. An RNA extraction method, comprising the steps of: obtaining a mixture under a heating condition, said mixture comprising: a sample comprising an RNA-including body and RNase, and an alkaline treating reagent comprising at least a reducing agent, and having pH of 8.1 or higher, and conducting inactivation of the RNase and extraction of RNA from the RNA-including body by keeping the mixture under the heating condition. An RNA detection method, comprising conducting RNA amplification reaction by mixing a treated sample liquid comprising RNA extracted by the extraction method and an amplification reaction solution.

Abstract: An object of the present invention is to provide a method of treatment and a method of storage that are useful in conducting a nucleic acid synthesis procedure capable of directly amplifying an intended nucleic acid in a living body-derived sample without purification steps. The present invention provides a method for synthesis of nucleic acids in which a living body-derived sample itself is mixed with a reaction solution for gene amplification and allowed to react, which method comprises treating the sample with a surfactant before the reaction to destruct solid components such as cells or bacterial bodies containing nucleic acids and uniformly disperse them in the sample liquid.

Abstract: An object of the present invention is to provide a novel method for suppressing the action of nucleic acid synthesis inhibitory substances and thereby amplifying a nucleic acid in a sample efficiently. According to the present invention, in a method for synthesis of nucleic acids to amplify an intended nucleic acid in a sample, the sample is brought in advance into contact with an insoluble polymer of a polyanion, a sulfated polymer or a sulfated polysaccharide, to remove nucleic acid synthesis inhibitory substances.

Abstract: An object of the present invention is to establish a method for amplifying an RNA in a biologically-derived sample by preparing a reaction solution in which a nucleic acid synthesis is not inhibited even in the presence of various biologically-derived impurities and as well as to enable a convenient, rapid and highly sensitive analysis of the RNA in the sample. In a method of the present invention, a reaction solution having a pH higher than that of an ordinarily employed reaction solution and/or containing a polyamine and/or a sulfated polysaccharide.

Abstract: An object of the present invention is to provide a method of treatment and a method of storage that are useful in conducting a nucleic acid synthesis procedure capable of directly amplifying an intended nucleic acid in a living body-derived sample without purification steps.

Abstract: An object of the present invention is to provide a novel method for suppressing the action of nucleic acid synthesis inhibitory substances and thereby amplifying a nucleic acid in a sample efficiently.

Abstract: The invention provides a filler for ink jet recording paper which is composed of an amorphous silica containing 0.3-1.0% by weight of Al.sub.2 O.sub.3 and having a BET specific surface area of 250-400 m.sup.2 /g, a mean particle size of 3.6-10.0 .mu.m and a peak position of pore radius as measured by mercury injection method of 37.5-75 angstrom. A coat layer of ink jet recording paper formed of this filler excels not only in true circle property of dots and ink absorbing property when printed by ink jet recording system, but also in surface strength and writing quality. Furthermore, the coating liquid containing this filler has a low viscosity and hence exhibits good coating workability.