Disclosed are the nanoparticle and the method for the same, and the preparing method includes steps of mixing polyethylenimine with the poly-bound iron oxide to form a PEI-PAAIO polyelectrolyte complex and mixing the PEI-PAAIO PEC with genetic material such as plasmid DNA to form the PEI-PAAIOpDNA magnetic nanoparticle. The disinfectant gel for hands of the invention contains 0. As a result, the pump motor is not necessarily always driven when the required braking force is generated, and the operating time period of the pump motor is reduced. The particles are integrated in the unitary support substrate layer. The host server generates a second transformed password and compares it to the password information received from the third party. The analog input signal is distributed to multiple processing channels operating in parallel.