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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)

- Rudolf E Fo, Horst E A Kramer, Ulrich E Steiner
- 2001

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)

- Rainer Löwen, Günter F Steinke, Hendrik Van Maldeghem, H Grundhöfer, L Hähl, H Kramer +5 others
- 2009

A topological translation plane may be defined as a system <£ of affine /-dimensional subspaces of IR 2/ such that (1) any two points are joined by a unique line L e & and joining is continuous; (2) Euclid's parallel postulate holds and & is invariant under translation. It is easy to see that one of the two parts of condition (2) may be omitted. We use… (More)

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