Abstract: An object of the present invention is to provide an agent for enhancing fertilization function of a mammal sperm, which comprises a low molecular compound which can be produced relatively easily and inexpensively as an active ingredient, and a method for enhancing fertilization function of a mammal sperm and a method for preparing a mammal fertilized egg, which use a low molecular compound which can be produced relatively easily and inexpensively. An agent comprising one or more compounds selected from the group consisting of compounds of the following formula (I0), formula (II), and formula (III), and physiologically acceptable salts thereof when R3 is OH is used as an agent for enhancing fertilization function of a mammal sperm.

Abstract: A plastic bumper for use in an automobile includes a front wall member generally having a U-shape cross-section, and a rear wall member having a mid portion intermittently indented to form a plurality of pyramid frustum shaped recesses. An outer end face of each pyramid frustum recess is adhered to an inside face of said front wall member. Thus, the bumper is reinforced with respect to vertical and horizontal impacts.