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Full-Text Articles in Physical Sciences and Mathematics
U.S.-Korea Cooperative Research: Carbon Monoxide As A Substrate For Microbial Maintenance, Gary M. King
U.S.-Korea Cooperative Research: Carbon Monoxide As A Substrate For Microbial Maintenance, Gary M. King
University of Maine Office of Research Administration: Grant Reports
Bacteria play an important role in the global budget of carbon monoxide (CO). Largely unknown bacterial populations in soils and the water column of aquatic systems oxidize hundreds of teragrams per year, or about 10%-20% of the estimated annual flux to the atmosphere. In spite of their biogeochemical significance, relatively little is known about the identity of CO-oxidizing populations active in situ, their phylogenic and physiological diversity or the importance of CO as substrate for their basic metabolic needs. of CO oxidizers. It is clear that CO at high concentrations (> 1000 ppm) can serve as a sole source of …
Microbial Observatories: Kilauea Volcano Observatory For Carbon Monoxide-Oxidizing Bacteria, Gary M. King
Microbial Observatories: Kilauea Volcano Observatory For Carbon Monoxide-Oxidizing Bacteria, Gary M. King
University of Maine Office of Research Administration: Grant Reports
Volcanic activity regularly creates new landforms from deposits of tephra, ash and lava. These initially sterile, pristine deposits undergo a range of physical, chemical and biological transformations that lead in some cases to diverse, complex ecosystems such as Hawaiian rainforests. Recent activity by the Kilauea volcano has created unique opportunities to understand the timing and controls of complex ecosystem development, and to analyze the roles of microbes as pioneering colonists that contribute to plant development and succession. The newly established Kilauea Volcano Microbial Observatory will compare the diversity and activity of carbon monoxide-oxidizing bacteria colonizing two different deposits currently 45 …
Sger: Is Bolling Warming Recorded By The Southeastern Margin Of The Laurentide Ice Sheet?, Harold W. Borns Jr., Brenda Hall
Sger: Is Bolling Warming Recorded By The Southeastern Margin Of The Laurentide Ice Sheet?, Harold W. Borns Jr., Brenda Hall
University of Maine Office of Research Administration: Grant Reports
This award, under the auspices of the Small Grants for Exploratory Research (SGER) program, uses funds to increase the chronologic control for the southeastern margin of the Laurentide Ice Sheet (LIS). Ultimately, the researchers want to explore whether they are able to document the response of the ice sheet to major shifts in atmospheric temperature and assess the ability of the ice sheet to produce large volumes of meltwater.
The effect of prominent climate events, such as the Bolling warming (13,000 radiocarbon years before present), on the dynamics of the Laurentide Ice Sheet (LIS) remains unknown and yet has important …
Collaborative Research: Late Quaternary History Of Reedy Glacier, Brenda Hall
Collaborative Research: Late Quaternary History Of Reedy Glacier, Brenda Hall
University of Maine Office of Research Administration: Grant Reports
The stability of the marine West Antarctic Ice Sheet (WAIS) remains an important, unresolved problem for predicting future sea level change. Recent studies indicate that the mass balance of the ice sheet today may be negative or positive. The apparent differences may stem in part from short-term fluctuations in flow. By comparison, geologic observations provide evidence of behavior over much longer time scales. Recent work involving glacial-geologic mapping, dating and ice-penetrating radar surveys suggests that deglaciation of both the Ross Sea Embayment and coastal Marie Byrd Land continued into the late Holocene, and leaves open the possibility of ongoing deglaciation …
Collaborative Research: Chronology Of Ice Fluctuations In The South Shetland Islands Since The Last Glacial Maximum, Brenda L. Hall
Collaborative Research: Chronology Of Ice Fluctuations In The South Shetland Islands Since The Last Glacial Maximum, Brenda L. Hall
University of Maine Office of Research Administration: Grant Reports
This award supports a study of the timing of climate changes in the Southern Hemisphere with the goal of reconstructing former ice extent and fluctuations, as well as paleoclimate, along the key latitudinal transect from temperate Tierra del Fuego to the polar Antarctic Peninsula. Samples already in hand will allow the dating of ice fluctuations in the South Shetland Islands (SSI), a critical location where that transect crosses the Antarctic Convergence. Surprisingly little concrete evidence exists concerning former ice extent in the island chain. The results of this study will answer a number of basic questions regarding ice extent and …
Collaborative Research: Mechanisms Of Abiotic Immobilization Of Nitrate In Temperate Forest Soils, David B. Dail
Collaborative Research: Mechanisms Of Abiotic Immobilization Of Nitrate In Temperate Forest Soils, David B. Dail
University of Maine Office of Research Administration: Grant Reports
Atmospheric deposition of nitrogen to temperate forests has increased in recent decades as a result of increased combustion of fossil fuels. Knowing how nitrogen in air pollution is retained within forests will improve the ability of scientists to anticipate interactions among efforts to mitigate human alterations of regional and global cycles of carbon and nitrogen. For example, the way that forests retain nitrogen affects the ability of forests to help mitigate expected global warming due to increased carbon gases in the atmosphere. Because nitrogen often limits rates of plant growth, increased nitrogen inputs could affect forest growth and health. Most …