Abstract: Antibody-sensitized latex for use in determination of a bacterium belonging to the genus Nitrospira, the latex comprising latex particles each having a specific gravity of about 1.5 g/mL and an average particle diameter in the range of 1.0-1.5 ?m and an antibody adsorbed thereon. The antibody is specific to a bacterium belonging to the genus Nitrospira having an activity of nitrite oxidization. The latex is mixed with a sample, allowed to stand for a predetermined period of time, and observed on the presence or absence of agglutination of the latex particles in the mixture. This latex permits detection and determination of a bacterium belonging to the genus Nitrospira which is found in biological sewage treatment systems, such as streams and activated sludge, as well as in water of rivers, lakes and seashore, and in soil habitats, in a simple and easy manner.

Abstract: An electronic apparatus has an apparatus body into which one of first and second, different kinds of cards can selectively be inserted. The positions of connecting terminals of the first and second cards are different from each other. When one of the cards is inserted into said apparatus body, an electrical communication between the card and the apparatus body can be attained. The apparatus includes an apparatus body having connecting sections and an adapter which comprises a base portion, a connector member accommodated in the base portion for connecting the connecting terminals of the card to the connections sections of the apparatus body, and a unit for holding the connector member selectively at either one of two positions, in the base portion, in accordance with the kind of card.