A method of producing a finely divided ruthenium-platinum alloy catalyst comprising: forming a mixture of platinum \u03b2-diketone and ruthenium \u03b2-diketone on a carbon support, both, platinum \u03b2-diketone and ruthenium \u03b2-diketone having a decomposition temperature within 20\xb0 C. The invention also relates to a method for screening of compounds which enhance wound healing by evaluating the healing of tympanic membrane perforations in an animal model. In the preferred embodiment the loop is made of three generally linear rigid members which are flexibly connected to each other such that, when the the rigid members are connected to the central pole, the formed loop extends at an upward angle from the pole. If a given input graphics tile is opaque, then any underlying input graphics tiles were are obscured may have their reading andor further processing suppressed. The defects of the upper portion of the polycrystalline silicon layer is prevented. The shutter is wound on a transverse roller which is received in an additional space defined in front of the radiator by a reinforcement crosspiece of the body having a substantially C-shaped outwardly projecting cross-section, which divides the front opening of the body into at least one lower opening and into at least one upper opening.