Methods for increasing the oral bioavailability of tetracycline compounds are described. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins. An etched diaphragm is located centrally on the second side of the sensor chip opposite the first side in association with the two SAW sensing elements in order to concentrate the mechanical strain of the sensor system or sensor device in the etched diagram, thereby providing high strength, high sensitivity and ease of manufacturing thereof. In response to receiving the assist torque request, the electric power assist steering system performs an operation for determining a column torque offset as a function of both a force being applied by a driver of the vehicle on a steering column of the vehicle and the requested additional assist torque required by the driving assist system. This makes it possible to provide an advertisement server device that can easily display an advertisement in a manner better suited to the advertiser’s needs, when displaying an advertisement within a page for displaying search results based on an entered search word or the like. The blue ink provide an image which has good water resistance and high optical density.