PURPOSE:To carry out favorable tissue culture without causing the reduction in hydrophilic nature at the surface of a molded article with time, by treating the surface by low-temperature plasma and ionizing radiation. CONSTITUTION:A molded article (laboratory dish, wide mouth bottle, flask, test tube, etc.) of a synthetic resin (polystyrene, styrene-acrylonitrile copolymer, styrene-maleic anhydride copolymer, polyvinyl chloride, etc.) is treated by low- temperature plasma to make an atom ratio of oxygen atom/carbon atom by X- ray photoelectron spectrum of 0.15-0.35. It is then irradiated with an ionizing radiation (high-speed electron rays, X-rays, alpha-rays, beta-rays, gamma-rays, ultraviolet light rays of short wave length, etc.). at =20 Mrad.
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