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Lumiflavin was prepared by photolysis of an alkaline aqueous solution of riboflavin (Knowles and Roe, 1968). As a solvent we used triply distilled water, as buffers (0,2 M) (Schwabe, 1958): pH 1-3'7 sodium acetate, hydrochloric acid pH 3·7-5·6 sodium acetate, acetic acid pH 6-12 potassium dihydrogen phosphate, sodium hydroxide pH 13 potassium chloride,(More)
In 1969 we defined in [8] and [9] the chromatic number γ(p,G) relative to distance p of a graph G to be the minimum number of colours sufficing for colouring the vertices of G in such a way that any two vertices of G of distance not greater than p have distinct colours. We gave also a characterization of the graphs for which we have γ(p,G) = p + 1. The same(More)
Fluorescence quenching of oxonine in methanol was investigated by means of a computerized dye laser flash spectrometer for the AGO, dependence of the quenching rate constant (k,) and the efficiencies of induced dye triplet formation (w), reduced dye radical formation (fR), and induced internal conversion. A total of 34 substituted benzenes including 20(More)
The diierential coincident pion electroproduction cross section in the 3 He(e,e 0 +) 3 H reaction has been measured with high resolution with the three-spectrometer setup at the Mainz Microtron (MAMI) electron accelerator. 1 Measurements were performed at the four incident energies E 0 = 855; 675; 600; and 555 MeV at xed four-momentum transfer Q 2 = 0.045(More)
The Prosthetics/Orthotics and Physical Therapy Departments were faced with the challenge of creating a modified crutch for an upper extremity amputee with lower extremity involvement. A 46-year-old man, with congenital absence of both fibulae and his left arm from above the elbow, underwent a left total hip replacement in March 1979. He then had a left(More)
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