Index Catalog // ScholarsArchive@OSU

Ecology and Environmental Controls of Two Keystone Groups of Oceanic Microorganisms : Diazotrophs and Pathogenic Vibrio

Creator:: Gradoville, Mary Rose
Abstract:: Marine bacteria play vital roles in every niche of the ocean, from small-scale symbioses to large-scale productivity and the regulation of Earth’s climate. Recent advances in molecular tools now allow us to probe the genetic potential of entire microbial communities. The next step is linking these diverse communities to the...
Resource Type:: Dissertation

A study on the effects of enhanced pCO2 on open ocean diazotrophic assemblages

Creator:: Gradoville, Mary Rose
Abstract:: Biological di-nitrogen (N₂) fixation is a key process in open-ocean ecosystems, where the new nitrogen (N) provided by marine diazotrophs can support a large fraction of primary productivity and carbon (C) drawdown. Recent laboratory studies have shown that elevated pCO₂ enhances the rate of N₂ fixation by select laboratory isolates...
Resource Type:: Masters Thesis
Full Text:: : _____________________________________________________________________ Ricardo M. Letelier Biological di-nitrogen (N2) fixation is a key process in open-ocean

Isotopic constraints on the pre-industrial oceanic nitrogen budget

Creator:: Somes, C. J., Oschlies, A., and Schmittner, A.
Abstract:: The size of the bioavailable (i.e., “fixed”) nitrogen inventory in the ocean influences global marine productivity and the biological carbon pump. Despite its importance, the pre-industrial rates for the major source and sink terms of the oceanic fixed nitrogen budget, N₂ fixation and denitrification, respectively, are not well known. These...
Resource Type:: Article
Full Text:: major source and sink terms of the oceanic fixed nitrogen budget, N2 fixation and denitri- fication

Complementary constraints from carbon ¹³C and nitrogen ¹⁵N isotopes on the glacial ocean's soft-tissue biological pump

Creator:: Schmittner, A. and Somes, C. J.
Abstract:: A three-dimensional, process-based model of the ocean’s carbon and nitrogen cycles, including 13C and 15N isotopes, is used to explore effects of idealized changes in the soft-tissue biological pump. Results are presented from one preindustrial control run (piCtrl) and six simulations of the Last Glacial Maximum (LGM) with increasing values...
Resource Type:: Article

Remineralization of marine particulate organic matter

Creator:: Burkhardt, Brian Gary
Abstract:: Marine microorganisms play a significant role in the cycling of nutrients in the open ocean through production, consumption, and degradation of organic matter (OM). Carbon (C), nitrogen (N), and phosphorus (P) are essential ingredients in every known recipe for life. However, the cycling of each of these elements proceeds at...
Resource Type:: Masters Thesis
Full Text:: ). Carbon (C), nitrogen (N), and phosphorus (P) are essential ingredients in every known recipe for life

Quantitative Metatranscriptomics and Biogeochemical Rate Measurements Reveal Microbial Pathways Driving Carbon and Nitrogen Cycles in an Arctic Lagoon

Creator:: Griffin, Natasha A.
Abstract:: Microbial communities in Arctic coastal lagoons drive biogeochemical cycles at the terrestrial-marine interface and help to determine the fate and form of resources like nitrogen (N) and carbon (C) as they are delivered to the Arctic Ocean. Though rising rates of primary production in the Arctic Ocean are well-characterized, the...
Resource Type:: Masters Thesis
Full Text:: important transformations such as carbon (C) fixation and nitrogen (N) cycling. Lagoons, which are

Soil organic matter regulates molybdenum storage and mobility in forests

Creator:: Marks, Jade A., Perakis, Steven S., King, Elizabeth K., and Pett-Ridge, Julie
Abstract:: The trace element molybdenum (Mo) is essential to a suite of nitrogen (N) cycling processes in ecosystems, but there is limited information on its distribution within soils and relationship to plant and bedrock pools. We examined soil, bedrock, and plant Mo variation across 24 forests spanning wide soil pH gradients...
Resource Type:: Article

Characterizing drivers of microbial community structure and function in diverse marine sediments

Creator:: Graw, Michael F.
Abstract:: Marine sediments are one of the largest habitats for microbial life on earth. These microorganisms play critical roles in biogeochemical cycling both within the subsurface and between the sediment and water columns. However, microbial communities in sediments are highly heterogeneous and the factors defining microbial community structure and metabolic function...
Resource Type:: Dissertation
Full Text:: potential for sulfur oxidation and denitrification, and had less genetic potential for nitrogen fixation

The Role of Iron: How Natural and Human-Induced Iron Fertilization Could Change Ocean Productivity

Creator:: Adroli, Nurmalia
Abstract:: Iron (Fe) is an important limiting nutrient that can affect the rate of ocean primary production because it is required by phytoplankton as an enzymatic cofactor in photosynthesis, nitrogen fixation, and other essential metabolic functions. Most Fe reaches the surface of the open ocean via atmospheric dust deposition, which is...
Resource Type:: Masters Thesis
Full Text:: phytoplankton as an enzymatic cofactor in photosynthesis, nitrogen fixation, and other essential metabolic

Impact of Igneous Mineralogy on the Composition and Metabolic Function of Microbial Biofilms in a Thermal Suboceanic Crustal Aquifer

Creator:: Smith, Amy R.
Abstract:: Igneous oceanic crust encompasses ~60% of Earth’s surface and is composed of basalt glass and mafic, ultramafic, and felsic minerals. A vast marine aquifer lies within the crust, exchanging geochemically altered fluids with seawater from the overlying ocean at ridge crests, flanks, seamounts, and outcrops where permeable crust is exposed....
Resource Type:: Dissertation
Full Text:: VizBin……………. 74 11. Figure 3.3. Summary of carbon fixation, methane, nitrogen, and sulfur cycling

ScholarsArchive@OSU

Ecology and Environmental Controls of Two Keystone Groups of Oceanic Microorganisms : Diazotrophs and Pathogenic Vibrio

A study on the effects of enhanced pCO2 on open ocean diazotrophic assemblages

Isotopic constraints on the pre-industrial oceanic nitrogen budget

Complementary constraints from carbon ¹³C and nitrogen ¹⁵N isotopes on the glacial ocean's soft-tissue biological pump

Remineralization of marine particulate organic matter

Quantitative Metatranscriptomics and Biogeochemical Rate Measurements Reveal Microbial Pathways Driving Carbon and Nitrogen Cycles in an Arctic Lagoon

Soil organic matter regulates molybdenum storage and mobility in forests

Characterizing drivers of microbial community structure and function in diverse marine sediments

The Role of Iron: How Natural and Human-Induced Iron Fertilization Could Change Ocean Productivity

Impact of Igneous Mineralogy on the Composition and Metabolic Function of Microbial Biofilms in a Thermal Suboceanic Crustal Aquifer

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