A negative electrode includes a negative electrode active material layer containing a negative electrode active material mainly containing silicon and silicon oxide. The housing includes an inlet, an outlet, and an intermediate portion extending therebetween, which is formed with an admission port for admitting the predetermined liquid material. According to the method, metal nanodots can be uniformly disposed in the nanowires, and nanowires having various physical properties can be produced by controlling the size and interval of the nanodots. The data signal is recovered from the intensity modulation for the data signal using the clock signal. The carbon nanotube film includes a number of carbon nanotube wires substantially parallel with each other and a number of carbon nanotube clusters located between the number of carbon nanotube wires. In particular, the invention relates to methods and compositions selected to monitor cardiorenal syndrome using assays that detect NGAL, preferably together with assays that detect natriuretic peptides such as BNP.