An object of the present invention is to provide a DOI synthase having properties such as stability to heat and pH, which are superior to those of conventional enzymes, and a method for producing DOI using the above-mentioned enzyme. Low-fluorescence glass is used for lenses of the first and seventh lens units of an objective lens used in both the illumination system and the observation system. The process includes the steps of mounting the new gallery, intermediate rake newel,location dependentmounting the starting newel, and attaching the rail section therebetween, and finishing off the upper portion of newels by attaching newel caps. A joint cover portion for covering the section where two or more edge cladding members meet. The porous pipe may be buried beneath the surface of a pile of mined ore, providing a more even and uniform distribution of the leaching solution across the pile, increasing metal yields, reducing water consumption and eliminating pooling and ponding of the solution on the top of the piles as occurs with prior art drip line emitters. The aggregation system allows a user to add a contact to a real-time contact list to enable real-time communications with that contact.