Index Catalog // ScholarsArchive@OSU

Fatty acid profiling of soil microbial communities : a comparison of extraction methods and temporal dynamics in plant residue amended soils

Creator:: Fernandes, Marcelo Ferreira
Abstract:: A method based on fatty acid (FA) analysis is used to profile microbial community structure (MCS). Various extraction protocols are available, which alter the types of FAs extracted from soils. The more time consuming but widely used protocol extracts only FAs from phospholipids (PLFA). This technique is desirable because PLFAs...
Resource Type:: Dissertation
Full Text:: outside of the range evaluated, other plant- and humin-associated peaks, as dihydroabietic acid (DHA

The Biogeochemistry of nitrogen and phosphorus cycling in native shrub ecosystems in Senegal

Creator:: Dossa, Ekw'e Lokossou, 1960-
Abstract:: Two native shrub species (Piliostigma reticulatum and Guiera senegalensis) are prominent vegetation components in farmers’ fields in Senegal. However, their role in nutrient cycling and ecosystem function has largely been overlooked. A study including both laboratory and field experiments was conducted to evaluate potential biophysical interactions of the two shrub...
Resource Type:: Dissertation
Full Text:: subtly arranging for the necessary chemicals and laboratory supplies needed for my soil and plant

Uranium and technetium bio-immobilization in intermediate-scale physical models of an in situ bio-barrier

Creator:: Michalsen, Mandy M.
Abstract:: Metal and hydrogen ion acidity and extreme nitrate concentrations typical of Department of Energy (DOE) legacy waste sites pose formidable challenges to successful implementation of in situ bio-immobilization. Intermediate-scale (~ 2.5 m), flow through models of an in situ bio-barrier were constructed to investigate U and Tc removal from groundwater...
Resource Type:: Dissertation
Full Text:: indirectly by ferrous iron, sulfide [30-33] or U (IV) [34]. Technetium (IV) forms the sparingly

Molecular characterization of bacterial populations implicated inthe anaerobic metabolism of toxic plant alkaloids from two different experimental and environmental sources

Creator:: Rattray, Rogan MacKay
Abstract:: There have been many studies that describe the protective degradation or metabolism of potentially harmful plant toxins, such as, mimosine from Leucaena leuconcephala, pyrrolizidine alkaloids from tansy ragwort (Senecio jacobaea), oxalate and some mycotoxins by rumen microbes. There are many cases of plant-related toxicoses suffered by ruminant animals where there...
Resource Type:: Masters Thesis
Full Text:: the Anaerobic Metabolism of Toxic Plant Alkaloids from Two Different Experimental and Environmental

Remediation of atrazine in irrigation runoff by a constructed wetland

Creator:: Runes, Heather B.
Abstract:: Due to its frequent use in agriculture and its frequent detection in surface water, atrazine was chosen as a model compound to study the treatment capability of a surface flow wetland used to remediate irrigation runoff at a container nursery near Portland, Oregon. Further evaluation of treatment of atrazine was...
Resource Type:: Dissertation
Full Text:: sediment bioaugmented with spill-site soil (1: 100 w/w) was shown to rapidly degrade 30% of atrazine added

Serpentine and non-serpentine edaphic ecology and the recovery of Lomatium cookii (Apiaceae), an endangered endemic of southwest Oregon

Creator:: Silvernail, Ian S.
Abstract:: The role of unusual geologies in plant distribution and form is well-known. Serpentine (ultramafic) soils exert a particularly strong influence on plants, as evidenced by a high level of endemism and the morphological and physiological traits displayed in adaptation to the extraordinary chemistry of these substrates. Adaptation may lead to...
Resource Type:: Masters Thesis
Full Text:: Ian S. Silvernail for the degree of Master of Science in Botany and Plant Pathology presented on

Iron acquisition and its regulation in Nitosomonas europaea

Creator:: Vajrala, Neeraja
Abstract:: Iron is absolutely necessary for the maintenance, the defense, the differentiation and last, but by no means least, the growth and cellular division of almost all living organisms including Nitrosomonas europaea, an ammonia oxidizing bacterium. Given the necessity of iron, it is not surprising that N. europaea evolved several irondependent...
Resource Type:: Dissertation
Full Text:: . Abstract…………………………………………………………...29 2.2. Introduction……………………………………………………….30 2.3. Materials and

Impacts of post-fire salvage logging on soil chemistry, physical properties and bacterial community composition in a mixed-conifer forest in central Oregon

Creator:: Jennings, Tara Nicolle
Abstract:: Land managers, scientists, and the interested public are confronted with uncertainty about the impacts of salvage logging on soil productivity. In recent years, stand-replacing wildfires in the western United States have increased in frequency, prompting the need to evaluate the effect of post-fire treatments on forest ecosystem recovery. This study...
Resource Type:: Masters Thesis
Full Text:: on the structure of the soil bacterial community than did logging disturbance. Plant-available

Physiological response of Nitrosomonas europaea to oxytetracycline, chromium, and silver

Creator:: Schaerer, Morgan A.
Abstract:: Nitrosomonas europaea carries out the first step in the biological nitrogen removal process in wastewater treatment by oxidizing ammonia to nitrite. It has been shown to be sensitive to a wide range of contaminants. The antibiotic oxytetracycline and the heavy metals chromium and silver have been found in wastewater influent....
Resource Type:: Masters Thesis
Full Text:: oxidizing ammonia to nitrite. It has been shown to be sensitive to a wide range of contaminants. The

Stable isotope probing of the ovine rumen for RDX degrading microorganisms

Creator:: Mitchell, Edward A.
Abstract:: The anaerobic and highly reductive conditions found in the ovine rumen are considered favorable for the degradation of the nitroaromatic explosives such as hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). In this study, we used stable-isotope-probing to determine the bacteria responsible for the degradation of RDX in the rumen. Results indicate 10 μg mL⁻¹ (45...
Resource Type:: Masters Thesis
Full Text:: ................... ....................................................... 30 7 Chart of Phylum level and Proteobacteria specific classification of 12C and 13C heavy-DNA

ScholarsArchive@OSU

Fatty acid profiling of soil microbial communities : a comparison of extraction methods and temporal dynamics in plant residue amended soils

The Biogeochemistry of nitrogen and phosphorus cycling in native shrub ecosystems in Senegal

Uranium and technetium bio-immobilization in intermediate-scale physical models of an in situ bio-barrier

Molecular characterization of bacterial populations implicated inthe anaerobic metabolism of toxic plant alkaloids from two different experimental and environmental sources

Remediation of atrazine in irrigation runoff by a constructed wetland

Serpentine and non-serpentine edaphic ecology and the recovery of Lomatium cookii (Apiaceae), an endangered endemic of southwest Oregon

Iron acquisition and its regulation in Nitosomonas europaea

Impacts of post-fire salvage logging on soil chemistry, physical properties and bacterial community composition in a mixed-conifer forest in central Oregon

Physiological response of Nitrosomonas europaea to oxytetracycline, chromium, and silver

Stable isotope probing of the ovine rumen for RDX degrading microorganisms

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