A nonvolatile semiconductor memory includes a trench isolation provided in a semiconductor substrate and an interlayer insulator provided on the semiconductor substrate. The device may be a cylindrically shaped antimicrobial hydrogel having a central opening and a slit along its length so that it can be applied directly over a previously inserted urinary catheter. Two free ends of the collapsible member are fixed to free ends of the cylinders respectively. The slurry in some methods is directly processed to form a final cheese product.