Mycobacteriumchubuense strain NBB4 can grow on both alkanes and alkenes as carbon sources, and was hypothesised to be an effective bioremediation agent for chlorinated aliphatic pollutants. In this study, the ability of NBB4 to biodegrade vinyl chloride (VC), cis-dichloroethene (cDCE) and 1,2-dichloroethane (DCA) was investigated under pure-culture conditions and in microcosms. Ethene-grown NBB4 cells were capable of biodegrading VC and cDCE, while ethane-grown cells could biodegrade cDCE and DCA. The stoichiometry of inorganic chloride release (1 mol/mol in each case) indicated that VC was completely dechlorinated, while cDCE and DCA were only partially dechlorinated, yielding chloroacetate in the case of DCA, and unknown metabolites in the case of cDCE. The apparent maximum specific activities (k) of whole cells against ethene, cDCE, ethane and DCA were 93 ± 4.6, 89 ± 18, 39 ± 5.5, and 4.8 ± 0.9 nmol/min/mg protein, respectively, while the substrate affinities (KS) of whole cells with the same substrates were 2.0 ± 0.15, 46 ± 11, 11 ± 0.33 and 4.0 ± 3.2 μM, respectively. In microcosms containing contaminated aquifer sediments and groundwater, NBB4 cells removed 85-95% of the pollutants (cDCE or DCA at 2 mM) within 24 h, and the cells remained viable for >1 month. Due to its favourable kinetic parameters, and robust survival and biodegradation activities, strain NBB4 is a promising candidate for bioremediation of chlorinated aliphatic pollutants.

Biodegradation of vinyl chloride, cis-dichloroethene and 1,2-dichloroethane in the alkene/alkane-oxidising Mycobacterium strain NBB4.

Es werden Verfahren zur Darstellung grosserer Mengen Tantalpentafluorid und Niobpentafluorid aus Tantalpentachlorid bzw. Niobpentachlorid und wasserfreier Flusssaure mitgeteilt. Die notigen Chloride werden am besten durch Erhitzen der Oxyde im Chlor- Chlorkohlenstoffstrom gewonnen.

Über Tantal- und Niobpentafluorid, sowie über die Reindarstellung der Tantal- und der Niobsäure

Argon: A New Constituent of the Atmosphere.

The system; sodium iodate, sodium oxalate, water

E. Kaufmann

Papers

Lösungsgleichgewichte von festen und flüssigen Stoffen in Flüssigkeiten

Lösungsgleichgewichte von Gasen mit Flüssigkeiten

Lösungsgleichgewichte von Gasen in festen und flüssigen Metallen

Gleichgewichte in Systemen mit mehreren nicht mischbaren flüssigen Phasen