The FIGURE is a front elevational view of the house facade of the present invention. The method further involves determining the strengths of such signals for the test sample versus the control sample, and using the difference to determine whether oxygen in the test sample is being consumed. The silica glass is a silica glass-based optical fiber having a core made of silica glass, where the core is positioned at a center of the optical fiber and contains at least germanium, and a clad made of silica glass, where the clad surrounds the core and has a lower refractive index than the core. The device includes an inner hollow member moveably disposed within an outer hollow member. The support element is preferably an independent component from the tubular element. In particular, the invention is directed to methods of reacting compounds of structure with Rf\u2014CH\u2550N2 or 2C\u2550N2 to form a perfluoroalkylate or -arylated compounds, and products derived from these reactions, where X, YB, and Rf are described herein.