Abstract: An inverted microscope comprises an image output port that forms an image of an observation sample to the external surface facing to an observer, at the front side of a microscope main body, below an observation tube to which eyepieces are attached, and photographing devices configured that one of at least two kinds of photographing devices is selectively attachable/detachable to the image output port.

Abstract: Arthropod-controlling composition comprising an &agr;-pyrone compound shown by the formula: as an active ingredient provides an excellent activity for controlling arthropods, and therefore, the composition is utilized for controlling harmful arthropods.

Abstract: 4-Hydroxy-6-methyl-3-(3-methylbutanoyl)-2-pyrone has a rapid controlling effect against arthropods such as Dictyoptera insects (e.g. German cockroach, smokybrown cockroach).

Abstract: 4-Hydroxy-6-methyl-3-(3-methylbutanoyl)-2-pyrone has a rapid controlling effect against arthropods such as Dictyoptera insects (e.g. German cockroach, smokybrown cockroach).

Abstract: It is possible to repel arthropod by applying 4-hydroxy-6-methyl-3-(4- methylpentanoyl)-2-pyrone of formula: to a place where it is desired to repel arthropods.

Abstract: An illumination apparatus of the present invention used for a microscope to guide illumination light to an objective lens attached to a revolving nosepiece comprises a light source for radiating the illumination light, an optical system for guiding the illumination light radiated from the light source, to the objective lens, an aperture diaphragm switching section provided in the optical system and having a plurality of aperture diaphragms and a light shielding portion, for switching the aperture diaphragm on the illumination light, linked with motion of the revolving nosepiece, when switching an observation method or the objective lens, and a control circuit for controlling operation of at least one of the aperture diaphragm switching section and the revolving nosepiece such that amount of light entering into the objective lens is prevented from undesirably increasing, when the observation method or the objective lens is switched.

Abstract: It is possible to repel arthropod by applying 4-hydroxy-6-methyl-3-(4- methylpentanoyl)-2-pyrone of formula: 1

Abstract: An inverted microscope comprises an image output port that forms an image of an observation sample to the external surface facing to an observer, at the front side of a microscope main body, below an observation tube to which eyepieces are attached, and photographing devices configured that one of at least two kinds of photographing devices is selectively attachable/detachable to the image output port.

Abstract: Arthropod-controlling composition comprising an &agr;-pyrone compound shown by the formula: 1

Abstract: An observation lens barrel for use in a microscope, comprising a main body for receiving a light beam applied from the microscope and including an image to be observed, an observation optical system provided in the main body and extending at right angles to a direction in which the light beam from the microscope is focused, and optical elements provided in the main body, for receiving the light beam from the microscope and emitting a light beam to the observation optical system. The main body has a first port and a second port. The first port is provided on a side opposing the microscope, with the optical elements located between the first port and the microscope. The second port is provided on a side opposing the observation optical system, with the optical elements located between the second port and the observation optical system.