A needle-less syringe adapter has a tube, a resilient valve, a piercing member and an injection member. The marking elements available to be fired at firing moments are described as the active set. The sensors detect a position of the cleaner with respect to the substrate, a proper rotation of components within the substrate, and a proper bias of the components. A backstop member is configured to be moved to a removing position unengaged with the holding unit and to an engaged position engaged with the holding unit to prevent a rotation of the developing unit in a direction opposite the one-way direction rotation. The buffer layer includes GaxAl1-xN and has a thickness of not smaller than 20 nanometers and not larger than 50 nanometers. The term \u201clayered material\u201d includes anionic clays, layered hydroxy salts, cationic clays, and cationic layered materials.