Polychlorinated biphenyl
Videos
Polychlorinated biphenyls are organochlorine compounds with the formula C12H10−xClx. They were once widely used in a range of industrial and consumer electronic products including the manufacture of c
PCB warning label on a power transformer known to contain PCBs
Labelling transformers containing PCBs
Old power transformers are a major source of PCBs. Even units not originally filled with PCB may be contaminated, since PCB and oil mix freely and any given transformer may have been refilled from hoses or tanks also used with PCBs.
Orca
Videos
The orca, or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. The only extant species in the genus Orcinus, it is recognizable by its distinct pigmentation; being
Polychlorinated biphenyl
…PCB concentrations within an organism also change depending upon which trophic level they occupy. When an organism occupies a high trophic level, like orcas or humans, they will accumulate more PCBs than an organism that occupies a low trophic level, like phytoplankton. If enough organisms with a trophic…
Killerwhales jumping
Orcinus citoniensis fossil, an extinct species of the same genus, Museo Capellini in Bologna
Modern orca skeleton, Naturalis, Leiden
An orca leaps out of the water when swimming—a behaviour known as porpoising—in Hood Canal