Abstract: The clutch includes inner and outer rotation members which respectively have the inner and outer raceways of mono-hyperboloids of revolution or cylindrical surfaces about the same axis line facing each other to form combined raceways, a plurality of intermediate rotation members of cylindrical shapes disposed slantly at an angle with the axis of the inner and outer rotation members with the raceways so that the surface thereof is in line contact with the raceways, and an energizing member which energizes either the inner rotation member or the outer rotation member in a direction to clutch both the members. Depending on rotational direction, the clutch functions as a free rotating rolling-contact bearing or clutch.

Abstract: Bacterial cells are separated from a culture broth by adding thereto a solution of casein or alkali-soluble soybean proteins, said culture broth being maintained at a pH less than 6. Bacteria cells are flocculated to form a protein-bacteria co-precipitate which is easily separable by a conventional procedure. The co-precipitate may be directly put to uses such as for foods or feeds.