The holding device of the endoscope allows suspension of the tissue while it is held and fixed securely. The surface has a northern hemisphere N and a southern hemisphere S. An upstream and a downstream temperature sensor are provided at upstream and downstream locations of the adsorbent in an exhaust system for detecting temperatures of exhaust gases upstream and downstream of the adsorbent. A surface of the gate-insulating layer is in contact with the second gate electrode. The use of these colloidal additives inhibits surface-to-surface contact and scuffing while providing reliable lubrication under boundary lubrication conditions: . The invention also concerns a feed preparation and a method for feed treatment in which this mycotoxin adsorbent is used.