Now showing items 1-10 of 826
Fukushima-derived radionuclides in the ocean and biota off Japan
(National Academy of Sciences, 2012-04-02)
Particle export during the Southern Ocean Iron Experiment (SOFeX)
We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4 week Fe enrichment experiment conducted in the high-silicate high-nitrate ...
pH-Dependent iron oxide precipitation in a subterranean estuary
Iron-oxide coated sediment particles in subterranean estuaries can act as a geochemical barrier (“iron curtain”) for various chemical species in groundwater (e.g. phosphate), thus limiting their discharge to coastal waters. ...
The presence of four iron-containing superoxide dismutase isozymes in Trypanosomatidae : characterization, subcellular localization, and phylogenetic origin in Trypanosoma brucei
Metalloenzymes such as the superoxide dismutases (SODs) form part of a defense mechanism that helps protect obligate and facultative aerobic organisms from oxygen toxicity and damage. Here, we report the presence in the ...
Revisiting carbon flux through the ocean's twilight zone
(American Association for the Advancement of Science, 2007-04-27)
Molecular biogeochemistry of modern and ancient marine microbes
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)
Biological activity has shaped the surface of the earth in numerous ways, but life’s most pervasive and persistent global impact has been the secular oxidation of the surface environment. Through primary production – the ...
The redox and iron-sulfide geochemistry of Salt Pond and the thermodynamic constraints on native magnetotactic bacteria
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-06)
Salt pond is a meromictic system with an outlet to the sea allowing denser seawater to occupy the monimolimnion while the mixolimnion has relatively low salinity and is the site of greater mixing and microbial activity. ...
The role of colloidal organic matter in the marine geochemistry of PCB’s
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-04)
Polychlorinated biphenyls (PCBs) were used as model hydrophobic organic compounds (HOC) to study physical~chemical processes which affect the speciation and fate of HOC in coastal environments. The focus of this study ...
Transport of trace metals in nearshore sediments
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1985-04)
The focus of this thesis is on rates of transport of metals both across the sediment/water interface and within the sediment column of nearshore sediments. The early diagenesis of several first-row transition metals exhibiting ...
Methodology for sampling and analysis of lipids in aerosols from the remote marine atmosphere
(Woods Hole Oceanographic Institution, 1984-04)
A procedure is described for the collection of remote marine aerosol samples by high-volume filtration, cascade impaction, dry fallout collection and rain. Samples were analyzed quantitatively for five classes of naturally ...