Clockwise from right: Photograph of sulfide chimneys covered with tube worms at Hulk
hydrothermal vent in the Main Endeavour Field on the Juan de Fuca Ridge, a tectonic
spreading center located off the coasts of the state of Washington in the United States
and the province of British Columbia in Canada; epi-fluorescence microscope image of
viral-like particles and cells from a hydrothermal vent diffuse fluid sample (grid is 72 x 72
μm across); and transmission electron microscope (TEM) images of bacterial and
archaeal viruses. Scale bars are 50 nm for bacterial viruses, 100 nm for archaeal viruses.
Site is 2,150 meters (about 6,500 feet) deep.
Credit: TEM image reproduced with permission from Krupovic et al., 2011, Microbiology
and Molecular Biology Reviews 75:610-635, 2011; other images: Rika Anderson and
John Baross, University of Washington.