A bioprosthetic stent graft is disclosed, having a stent frame and a biomaterial sheath suturelessly bonded to the stent frame. The motor housing has a porous noise prevention part at least at a portion, and at least a part of air discharging from the air outlet passes through the noise prevention part. The present invention discloses a method of selectively removing such extrusions. The container may be guided into the chamber with a plurality of chamfers. The present invention also describes flour, oral rehydrating solutions, beer adjuncts, food, feed, beverage additives incorporating the grain compositions made as described. The transformer transforms a differential radio frequency signal to a single-ended RF signal.