A dishwasher having a dishwasher is provided in which an intake port cover for closing a steam intake port is mechanically operated. The biological condition is preferably one associated with dysregulated arginine metabolism andor abnormal endogenous levels of substances resulting from or involved in arginine metabolism. The lens system satisfies the following conditions:0. The time sequence of incorporation of nucleotide analogs is determined by identifying the types of labels of the nucleotide analogs that are incorporated into the growing strand using measured impedance. This two step clearing procedure avoids device latchup that might occur otherwise.