A drum type paper stock refine screen is provided which is capable of efficiently filtering a refined paper stock to the outside of a laterally suspended rotary drum and efficiently discharging foreign matter to the outside of the drum while rotating the drum. In certain embodiments, the compounds produced are secreted into the medium used to culture the organisms. The lever forming a remaining portion of the eye loop. A purpose of the abstract is to enable the Patent Offices and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure.