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.
1832 Using Faradayâs principles, Hippolyte Pixii built the first âdynamo,â an electric generator capable of delivering power for industry. Pixxiâs dynamo used a crank to rotate a magnet around a a piece of iron wrapped with wire. Because this devise used a coil of wire, it produced spikes of electric current followed by no current. 1835 Joseph Henry invented the electrical relay, used to send electrical currents long distances.