Several gastrointestinal surgery procedures are effective as treatments for metabolic disorders such as obesity and diabetes. The user’s network graph data is typically updated by such processing\u2014providing a form of virtual image memory that can influence future social network behavior. For example, impregnating an adsorbent support such as silica gel with an aqueous solution of the europium-containing reagent solution described herein, and dehydrating the support to dryness forms a substance with a yellow color. An inner ring is fitted on the cylindrical portion of the wheel hub. To remove the housing from the mounting slot, the detent springs are retracted into the housing by rotating the catch.