Concentration and transport of nitrate by the mat-forming sulphur bacterium Thioploca

Article Abstract:

Nitrate is migrated into the sediment by Thioploca bacteria using a unique mechanism of concentrating nitrate in liquid vacuoles that make up more than 80% of the bacteria's cells. The mechanism involves hydrogen sulphide oxidation linked to the sediment's sulphur cycles. This bacteria exists in thick mats in the oxygen-minimum zone of the upwelling region off the Pacific coast of South America.

Analysis, Physiological aspects, Nitrates, Sulfur bacteria

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The role of fluids in lower-crustal earthquakes near continental rifts

Article Abstract:

Three-dimensional tomographic imaging of seismic velocities and seismic attenuation is presented for Taupo Volcanic Zone (TVZ). It is found that crustal earthquakes accurately relocated deepening from mostly less than 10 km in the central TVZ to depths of 30-40 km in the lower crust, 30 km southwest of the termination of the volcanic zone.

Science & research, Research, Usage, Environmental aspects, Earth, Crust (Geology), Tomography, Volcanic gases

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