A wind turbine blade for a wind turbine is a shell structure of a fiber-reinforced composite and comprises a root region and an airfoil region. The physical behavior of the carbon nano-tubes, particularly a bending action that alters a normally linear configuration, is affected by elements of the transistor, such as a space between the carbon nano-tube and a conductor. The digital data comprises a sequence of signaling waveforms having a first or a second duty cycle, respectively, wherein each signaling waveform has the same shape. Thus, wire connection by soldering is eliminated and troubles in assembly are eliminated. The method comprises the steps of partially fixing a biological soft tissue with glutaraldehyde by cross-linking and incubating the partially fixed tissue together with an elastase.