Abstract: A method for the quantitative determination of polyamines, which comprises allowing a polyamine oxidizing enzyme, an .omega.-aminoalkylaldehyde dehydrogenase, an oxidized nicotinamide coenzyme and, as required, an acylpolyamine anidohydrolase to act upon a sample solution containing polyamines (for example, urine, blood and other kinds of body fluid), and measuring the reduced nicotinamide coenzyme thus formed by, for example, colorimetry, thereby determining the amount of said polyamines.

Abstract: An immunological assay method, wherein the concentration of a substance to be assayed is calculated from a calibration curve, which is formed in the preparation of a reagent or in the assay of a sample based on parameter(s) determined in the preparation of the reagent, without the need of forming any additional calibration curve each time, is disclosed. By the immunological assay method of the present invention, the concentration of the substance to be assayed can be efficiently and discontinuously determined, when compared with conventional ones. The method of the present invention is particularly suitable for quantitatively determining an antigen or an antibody.

Abstract: An oriented polyolefin film containing particles of a condensated resin comprising, as a structural unit, a compound having a triazine ring with an average particle size of 0.5 to 10 .mu.m are contained at a ratio of 0.01 to 0.1% by weight based on a polyolefin and oriented monoaxially or biaxially by a factor of at least 4 in the orienting directions.

Abstract: A block of this invention for constructing a retaining wall is characterized by having a front wall portion of a rectangular shape, a rear retaining portion extending rearwardly and perpendicularly from the front wall portion and a gnarl-like uniting portion integrally formed at the distal end of the rear retaining portion. The block is further provided with vertical elongated holes through which reinforcing bars pass at least at a position where the front wall portion and the rear retaining portion merge and in the gnarl-like uniting portion. Due to such construction, when the blocks are stacked up in rows and the soil for land creation is charged in the spaces, each of which is defined by the front wall portion, the rear retaining portions and the gnarl-like uniting portion to form a retaining wall, such retaining wall can show increased integrity and stability against earthquakes, vibrations or flood disasters.