Abstract: Modified neurotoxins that contain protease cleavage sites susceptible uniquely to proteases present in certain tissues are described. The toxins can be selectively activated by proteases in muscle or selectively inactivated by proteases in blood.

Abstract: The present invention discloses modified neurotoxins with altered biological persistence. In one embodiment, the modified neurotoxins are derived from Clostridial botulinum toxins. Such modified neurotoxins may be employed in treating various conditions, including but not limited to muscular disorders, hyperhidrosis, and pain.

Abstract: A digital meter is designed for measuring alternating current and is formed of a metal rotary disk, a light-emitting element, a light-sensing element, a signal wire, and a signal conversion display. The metal rotary disk is provided with a through hole located at an appropriate position thereof The light-emitting element and the light-sensing element are corresponding in location to each other such that they are located on a rotational path of the through hole. As the metal rotary disk completes one revolution, the light-sensing element receives once a light signal is transmitted via the signal wire into the signal conversion display by which the signal is converted into a numerical value of power consumtion. The numerical value of power consumption by a power user is thus attained by a terminal located in the power company without the use of a meter-person.