A method, an apparatus, and a computer program product for wireless communication are provided. The shaft is configured to be connected to an auxiliary power unit and rotated by the APU. The acid formation is then detected by determining the pH at least once within a period of 12 hours after adding the carbon source, wherein the cariogenic bacteria are determined semi-quantitatively in the sample by comparison of the pH with at least one reference value. This allows the multi-hull vessel to plane at relatively low speeds without risking the consequences of a leeward planar hull digging into the water. The rotation shaft is moved with the tubular member towards the fastener. The precipitated proteins may include a single inhibitor protein, or a mixture thereof.