For the interpretation of the electron paramagnetic resonance spectra of doped boron it is desirable to know the structure of boron. Based on the structure of fl-rhombohedral boron proposed in 1963-65 by Hoard and co-workers, the atomic coordinates were refined by means of intensity measurements of a boron single crystal. An R1 factor of 10.6% was obtained.
EinleittmgMit Kohlenstoff dotiertes fl-rhomboedrisches Bor ist 1Gcherleitend und besitzt eine paramagnetische Elek-
The influence of Fez03, pyruvate and a sealing putty on microbiologically induced corrosion in part of a copper cold-water plumbing system in a large building was investigated. For this purpose, these three substances were injected into the pipe lumen of a non-disinfected and a thermally disinfected section of a tap line affected by microbiologically induced corrosion. It was shown that these substances stimulate, in varying degrees, the microbiological corrosion of copper pipes.Untersucht wurde der EinfluR von FezOs, Pyruvat und einem Dichtkitt auf die mikrobiologisch beeinfluRte Korrosion in einem Teilbereich eines Kaltwasser-Hausinstallationssystems aus Kupferrohren.Dazu wurden diese drei Substanzen jeweils ins Rohrlumen des undesinfizierten und des thermisch desinfizierten Kupferrohres des unter mikrobiologischer Beteiligung korrodierenden Trinkwasser-Installationssystems injiziert. Es konnte gezeigt werden, daB diese Substanzen in unterschiedlichem Ausmal3 die mikrobiologische Korrosion von Kupferrohren fordern.
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