An electrical discharge weapon projectile for immobilizing a live target that includes a shock circuit having a low power consumption, a high power efficiency, andor a low weight. By this process, the polyester-polyether block copolymers are firmly incorporated into the polyurethane matrix on curing, so that they are migration-proof. Also disclosed are compositions and methods for the isolation and characterization of nucleic acids that are specific to one or more pathogens, including for example Influenza virus and Mycobacterium tuberculosis, from a wide variety of samples including those of biological, environmental, clinical andor veterinary origin. The adjustable opening operates to adjust the airflow rate through the housing. Besides, infrared suitable to the absorption of human body for good blood circulation and body health is produced, and beneficial negative ions are increased in the air to balance the humidity and achieve anti-bug design, efficiently boosting the quality and effects of the disposable wearing article thereof. For greater security, the randomizer uses a random mapping function that is re-computed periodically.