Of the bacterial isolates found in the Arctic that are able to degrade PCBs, none used compounds such as 2-chlorobiphenyl, 3-chlorobiphenyl, camphor, citronellol, cymene, dehydroabietic acid, limonene, methanol, n-hexadecane, pentachlorophenol, phenol, or pinene as primary growth substrates (Master and Mohn 1998).
In the 20th century, demand for electricity led to the consideration of geothermal power as a generating source. Prince Piero Ginori Conti tested the first geothermal power generator on 4 July 1904, at the same Larderello dry steam field where geothermal acid extraction began. It successfully lit four light bulbs. Later, in 1911, the world's first commercial geothermal power plant was built there.
1791 First patent for a gas turbine (John Barber, United Kingdom) 1904 Unsuccessful gas turbine project by Franz Stolze in Berlin (first axial compressor) 1906 GT by Armengaud Lemale in France (centrifugal compressor, no useful power) 1910 First GT featuring intermittent combustion (Holzwarth, 150 kW, constant volume combustion)