Microbial activity within elevated CO2 and oxygen depleted environments changes with
density driven stratification overturn in the seasonally anoxic region of Devil’s Hole,
Bermuda. The temperature gradient developed during the summer months creates a
natural laboratory to study bacterial and virus population density and microbial
community dynamics in the anoxic...
Over 100 monthly bacterioplankton DNA samples, from each of the surface and 200 m depths at the Bermuda Atlantic Time-series Study (BATS) site, were analyzed for community assembly processes. Correlation networks, filtered for potential autocorrelation artifacts, were constructed for each depth. Network characteristics for the two depths were remarkably similar...
In recent years, the general public has recognized the dangers of a high fat diet and
are demanding meat with lower fat content. This demand has stimulated research in the
growth and regulation of adipocytes. However, despite much effort, no adipocyte-specific
plasma membrane markers from any species are available as...
Iron (Fe) and copper (Cu) are essential cofactors for microbial metalloenzymes, but little is known about the metalloenyzme inventory of anaerobic marine microbial communities despite their importance to the nitrogen cycle. We compared dissolved O₂ , NO₃⁻, NO₂⁻, Fe and Cu concentrations with nucleic acid sequences encoding Fe and Cu-binding...
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, Stephen J. Giovannoni 7, KevinL. Vergin 7 and Frank J. Stewart 1, 2
1 School of Earth and Atmospheric
Iron (Fe) and copper (Cu) are essential cofactors for microbial metalloenzymes, but little is known about the metalloenyzme inventory of anaerobic marine microbial communities despite their importance to the nitrogen cycle. We compared dissolved O₂ , NO₃⁻, NO₂⁻, Fe and Cu concentrations with nucleic acid sequences encoding Fe and Cu-binding...
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J.
Giovannonig, KevinL. Verging, Frank J. Stewarta,b
*Correspondence: Corresponding Author
Iron (Fe) and copper (Cu) are essential cofactors for microbial metalloenzymes, but little is known about the metalloenyzme inventory of anaerobic marine microbial communities despite their importance to the nitrogen cycle. We compared dissolved O₂ , NO₃⁻, NO₂⁻, Fe and Cu concentrations with nucleic acid sequences encoding Fe and Cu-binding...
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reaction center, L and M subunits 81482 0 0 0 629 122 12 10 6 170 6 11 0
f.21.1.2 Cytochrome b of
Inflammation is one of the first, most important responses of the immune system when presented with infection and is mediated primarily by eicosanoids and cytokines. The goal of this research was to generate monoclonal antibodies against murine IL17C, a poorly characterized cytokine involved in inflammation and linked to inflammatory conditions....
This thesis is a collection of four submitted manuscripts that present
methods to assist forest ecosystem service managers wanting to develop
operational sampling, monitoring, and production plans for a set of
specific quantifiable ecosystem services, which are formulated as a
series of general multi-objective optimization problems. The problems
are solved...
In this investigation, six different endogenous thyroid hormone derivatives—T₄, T₃, TA₄, TA₃, T₁-Amine, and N-Acetylated T₁-Amine—were tested to gain insight into their permeability coefficients and efflux ratios across a monolayer of Madin-Darby Canine Kidney (MDCK II) cells. The results indicate that T₃ and T₄ were unable to traverse the membrane...
This study sought to explore the differences between the varied academic advising models in the College of Science at Oregon State University through the feedback of its undergraduate students and advisors. Using parallel surveys of students and their academic advisors, it found that the decentralized and centralized models each had...
Uveitis is a serious ophthalmological disorder characterized by intraocular infiltration of inflammatory cells. In most cases, uveitis is derived from the adaptive immune response. More specifically, CD4+ T lymphocytes play an important role in the pathogenesis of uveitis by recognizing uveitogenic antigen and orchestrating the immune response. While it is...
A one-mile section of a newly constructed forest road in Northwest Oregon was analyzed for various aspects of subgrade and surface strength and their association with the formation of ruts during the first hauling season. Field and laboratory tests were completed on the road and the road materials to determine...
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Kevin Boston
A one-mile section of a newly constructed forest road in Northwest Oregon was
Approximately five to eight percent of domestic rams demonstrate a sexual attraction
towards other rams, directing no sexual behaviors towards estrous ewes. It has been
observed that these male-oriented rams (MORs) have a greater abundance of prolactin
mRNA than female-oriented rams in the medial preoptic area of the anterior
hypothalamus...
Total US lumber production in 2011 was 77.9 million cubic meters. Its primary use was for housing and construction. There is a growing concern that the structural properties for wood are being reduced as trees are harvested at much younger ages as the wood supply shifts from older to younger...
The USDA Forest Services' actions have come under greater scrutiny by a public that has become increasingly concerned with the legality of their actions. Often, challenges involve the quality of science used in the decision-making. Congress has mandated that the agency use the "best available science" in its decision making...
The pulse-coupled oscillator model is widely used to simulate the dynamics of neural systems. For networks with particular internal (Mirollo-Strogatz) dynamics, I will define three broad patterns of collective behaviors found in literature in terms of inter-spike interval (ISI) statistics. These patterns are i) temporally-regular, characterized by all oscillators in...
Iron (Fe) and copper (Cu) are essential cofactors for microbial metalloenzymes, but little is known about the metalloenyzme inventory of anaerobic marine microbial communities despite their importance to the nitrogen cycle. We compared dissolved O₂ , NO₃⁻, NO₂⁻, Fe and Cu concentrations with nucleic acid sequences encoding Fe and Cu-binding...
Our understanding of nitrogen (N) and phosphorus (P) variability in forested stream systems with minimal disturbance is confounded by the complex interactions of hydrologic and biogeochemical controls. In this thesis, our studies evaluate the variability of stream water N and P in a forested, headwater system in the Oregon Coast...
Forest harvest practices can impact nutrient concentrations and stream temperatures, altering aquatic ecosystems. To better inform future sustainable forest resource management practices, quantifying the impact of current practices on water quality, particularly in headwater streams is important. In this study, I quantified monthly nitrate-nitrite (N) and orthophosphate (P) concentrations, 7-day...
In recent decades, the occurrence of large, high severity wildfires has increased substantially in many parts of the world, including the western United States. These fires have the potential to impact water quality, aquatic ecosystems, and downstream communities for many decades. As such, it is increasingly important to understand the...
Work engagement is demonstrated when employees are involved with, committed to,
enthusiastic, and passionate about their work. The goal of this study was to summarize
relevant information on work engagement, produce a working coding system to identify
evidence of work engagement, and discuss the implications of work engagement on an...
The psychoactive component of marijuana, A9-tetrahydrocannabinol (THC), is known
to have effects in humans that are mediated by the cannabinoid receptor (CB 1). Although a great deal of research has been done to confirm the interaction of exogenous cannabinoids with the CB 1 receptor, little is known about the receptor's...
Current natural product (NP) research is limited by its reliance on bioassay-guided fractionation to identify bioactive compounds in mixtures. Computational approaches may improve NP research by correlating mass spectra (MS) and nuclear magnetic resonance spectra (NMR) of bioactive mixtures to their bioactivity patterns. In this study, I use artificial neural...
The extent and severity of wildfires in forested regions are increasing throughout many regions on the planet, including western North America. High-severity wildfires directly affect soils and vegetation by altering soil hydraulic properties, reducing soil organic matter, exporting carbon and nitrogen, and killing trees and understory vegetation. These impacts can...
The 3-substituded indolic enamide moiety has been found in many marine compounds over the past 20 years. These indolic enamides exhibit various biological properties such as cytotoxic, anthelmintic, antimicrobial and HW-inhibitory activities. Among these indolic enamides, some are (E)-enamides, like coscinamide A and coscinamide B, others are (Z)-configuration in their...
Studies toward the total syntheses of highly potent cytotoxic alkaloids
including the bromopyrrole alkaloids and indole alkaloids were conducted and are
described. Studies carried out in the course of this dissertation consist of five total syntheses of natural products that include bromopyrrole alkaloids nagelamide A, D and agelastatin D as...
Shallow subsurface flow and surface runoff are spatially and temporally variable in forested environments. The location and timing of this runoff depends on both site characteristics (e.g., vegetation, soil texture, geology, and topography) and on time-varying conditions (e.g., soil water content, precipitation type, duration, magnitude, and intensity). Forest management activities...
The epoxide deoxygenation reaction is formally the reverse of theepoxidation reaction. Compared to epoxidation, which has reached its fullmaturity, epoxide deoxygenation has not been as intensively developed.Among the few deoxygenation reagents, a handful are catalytic in a metalcomplex, show high stereospecificity and operate under mild conditions. Acommon feature of all...
In situ, reduction of Cp*ReO₃ by PPh₃ to form (Cp*ReO)₂(μ-O)₂ allows catalytic deoxygenation of epoxides, however, conproportionation between Reⱽ and Reⱽᴵᴵ species to form clusters of ((Cp*Re)₃(μ-O)₆}²⁺(ReO₄⁻)2 and new compound {(Cp*Re)₃(μ²-O)₃(μ³-O⁾³ReO₃}⁺(ReO₄⁻) leads to removal of rhenium from the catalytic cycle and loss of activity, The epoxide deoxygenation mediated by (Cp*ReO)₂(μ-O)₂...
In situ reduction of hydrido-tris-(3,5-dimethylpyrazolyl)borato(trioxo) rhenium(V) with triphenylphosphine or triethylphosphite leads to a reactive rhenium(V) species that catalytically deoxygenates epoxides at 75-105°C. The reaction is stereospecific, except for trans- and cis-butene oxide which formed minor amounts of the opposite isomer. A variety of different functional groups were tolerated and even...
A series of compounds, 7-8 and 20-25, were tested as competitive inhibitors of 2,5-dihydroxyacetanilide epoxidase I (DHAE I) and DHAE II. A Hammett plot was constructed for each enzyme to determine the effect of electron density on inhibition. DHAE I gave a linear, highly correlated plot (r²=0.91) that signifies the...
The rhenium (V) complex Tp'ReO₂ (Tp' = hydrido-tris-(3,5-
dimethylpyrazolyl)borate), generated in situ from PPh₃ reduction of
Tp'Re0₃, reacts with small ring heterocycles such as epoxides and
episulf ides. The strained trans-cyclooctene ring provides an unusual
thermodynamic bias against direct atom transfer, but trans-cyclooctene
oxide still produces substantial amounts of trans-cyclooctene....
The gut microbiome has been previously implemented in a number of diseases. Of note is its substantial role in metabolic syndrome, which encapsulates a group of conditions that increase the risk of cardiovascular disease, type 2 diabetes, and stroke. Understanding the causal relationships between the gut microbiome and host processes...
Timber harvesting practices can increase fine sediment inputs to streams due to increased hillslope soil erosion and mass wasting of roads, hillslopes, and stream channels. Excessive fine sediment depositions have been shown to impact aquatic ecosystems, fish habitat, and downstream community water supply. Despite these deleterious impacts, the influence of...
The rhenium dithiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazol yl) borato(ethane- 1 ,2-dithiodiolato)(oxo)rheni um(V), and Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl)borato(phenylethanedithiodiolato)(oxo)rhenium(V), were synthesized by reductive cyclocondensation of alkane-1,2-dithiols with Tp'Re0₃ in a one pot fashion. The rhemium monothiodiolate, Hydrido-tris-(3 ,5-dimethyl- 1 -pyrazolyl) borato(ethane- 1 ,2-monothiodiolato)(oxo)rhenium(V), and Hydrido-tris-(3 ,5- dimethyl- 1 -pyrazolyl)borato(propanemonothiodiolato)(oxo)rhenium(V), were also synthesized...
Airborne discrete-return lidar is an active remote sensing technology capable of obtaining accurate, fine-resolution three-dimensional measurements over large areas. Discrete-return lidar data produce three-dimensional object characterizations in the form of point clouds defined by precise x, y and z coordinates. The data also provide intensity values for each point that...
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Kevin D. Boston
Airborne discrete-return lidar is an active remote sensing technology
Flow cytometry is a highly-extensible technology for performing rapid multi-parametric particle analysis. The use of flow cytometry has proliferated with the advent of smaller, intuitive, and more affordable instruments, along with a perpetual increase in research and medical applications. However, the technology is still largely inaccessible due to cost and...
In this dissertation, a novel method for analyzing computed transition states (TS) for organic reactions is disclosed. It introduces the use of localization-delocalization matrices as parameters in a linear free energy relationship to determine the transition state interactions responsible for differences in energy between the major and minor TS in...
Current frameworks for analyzing forest carbon offset projects in disturbance-prone western forests often fail to address the dynamic nature of carbon pathways through time. They do not account for the probability of loss due to wildfire, which can influence the prediction of carbon storage at the end of a planning...
Wildfires can affect soil physical properties, resulting in changes in infiltration, hillslope runoff, groundwater recharge, and sediment and dissolved nutrients to streams. In November 2016, the Chimney Tops 2 Fire burned 4,617 ha of Appalachian hardwood forest in eastern Tennessee. A portion of the fire burned through a National Ecological...
The purpose of this study was to investigate the effects of wildfire on soil hydraulic properties of forested hillslopes. The study site was located within the Stouts Creek wildfire, which burned approximately 10,705 ha of forest in southwestern Oregon in summer 2015. Three soil hydraulic properties (soil moisture, unsaturated hydraulic...
Headwater streams represent the majority of the drainage area of a river network and provide many critical functions supporting aquatic and terrestrial ecosystem health. The riparian zones that surround these streams are transitional areas between terrestrial and stream ecosystems, which provide key habitat for aquatic and terrestrial organisms, especially during...
Cell counting is a key tool used in biological and clinical laboratories, but at present, commercial cell counters are large and expensive. CMOS technology is a promising platform for creating small, low-cost sensors but currently lacks a robust method of directly interfacing these sensors with the microfluidic networks needed for...
Irrigated crop production is a stabilizing element in the
agricultural economy of Southeast Ford County, Kansas. The important role
irrigation plays in the local economy creates a need to carefully consider
the potential impact of aquifer depletion. An examination of the spatial
and temporal characteristics of aquifer depletion in relation...
Time trends in flow and channel characteristics were evaluated for the Middle Fork Willamette (MFW) River, which drains a 668 km2 forested watershed in the Cascade Mountains of western Oregon. Timber
production is the primary land use in the watershed. Analysis of precipitation and peak flow data from 1959 to...
Mountainous headwater streams make up ~80 % of stream length globally and are strongly connected with catchment hillslopes and riparian areas, which can influence water quantity, quality, and availability for downstream uses. Accordingly, effective management of headwater streams and riparian zones to maintain desired ecosystem services downstream is critical, particularly...
Forested headwater streams are critical for the supply of water, sediment, nutrients, and organic matter to downstream water bodies. Nearly half of all headwater streams display temporary flow regimes (i.e., non-perennial), but with climate change they may become more common. Thus, it will be increasingly imperative to adequately represent non-perennial...
Skeletal muscles provide several functions, including, yet not limited to, voluntary body movement and locomotion, posture and body position, and soft tissue support. Skeletal muscles also play a role in metabolism, requiring energy to facilitate contraction. Each skeletal muscle serves a different purpose despite seeming to perform the same task....
Seasonal diet and food selection of California quail (Callipepla
californica) were studied at E.E. Wilson Wildlife Area, Oregon,
during 1985 to 1987. Analysis of diets of 105 quail, along with
information from 117 quail taken during 1976 to 1978 revealed 14 key
plant foods. Collectively, the key foods composed 87%...
This thesis examines the motivations of ecological restoration volunteers with the Oregon chapter of The Nature Conservancy. This study helps fill in voids left by a lack of research on the motivations of ecological restoration volunteers. Studies that have explored restoration volunteer motivation relied largely on surveys that revealed altruistic...
Purpose: Model-based dose calculation algorithms (MBDCAs) have become clinically available within the past several years in commercially available brachytherapy planning systems. This work investigates the application of a 510(k) approved MBDCA Acuros™ BV and establishes a reproducible method of validation. The research is broken into three primary research goals. The...
This comprehensive bibliography is collection of refereed research related to climate change, wetlands and wetland restoration published before January 1, 2008.
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KevinL. Erwin, York University
2007
This comprehensive bibliography is a compilation of peer
This comprehensive bibliography is collection of refereed research related to climate change, wetlands and wetland restoration published before January 1, 2008.
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reproduction of red mangrove (Rhizophora mangle L.)
Oecologia, 112: 435-446
Ellison JC. (1993) Mangrove
This comprehensive bibliography is collection of refereed research related to climate change, wetlands and wetland restoration published before January 1, 2008.
Robotic Bipedal locomotion holds the potential for efficient, robust traversal of difficult terrain. The difficulty lies in the dynamics of locomotion which complicate control and motion planning. Bipedal locomotion dynamics are dimensionally large problems, extremely nonlinear, and operate on the limits of actuator capabilities, which limit the performance of generic...
Landscape positions have been used to determine soil properties. My soil study in Monteverde on the Pacific slope of Costa Rica was designed to examine soil-landscape relationships for sites with various land use histories and management. Soil pits were dug at Nacimiento y Vida, Crandell, Curi-cancha, La Calandria, and Finca...
Understanding the magnitude and longevity of wildfire effects in forested watersheds and subsequent impacts to downstream aquatic ecosystems and communities requires congruent investigation into post-fire aquatic and terrestrial processes. However, results from wildfire studies are often confounded by pre- and post-fire land management actions and based on either hydrologic or...
PART I. A deuterium exchange analysis of 2,5-dihydroxyacetanilide (5) in the absence and presence of DHAE II was performed to test the nucleophilicity of the substrate in the absence and presence of catalyst. In addition, inhibition studies using 1,4-dihydroxybenzene were performed to determine the role that the N-acetyl side chain...
The rapid pace of climate change is increasing tree mortality and highlighting the need to improve the mechanistic understanding of plant function under increased water stress. However, the processes that control soil moisture availability in steep mountainous terrain are poorly understood, as are the relative effects of atmospheric and soil...
Two different types of Phosphorodiamidate Morpholino Oligomers (PMOs) were used to
inhibit growth in pure cultures of Salmonella enterica serovar typhimurium and in mouse
macrophages infected with S. typhimurium. Both PMOs were 11 bases long and
complementary to bases 6-16 of acyl carrier protein mRNA. A membrane-penetrating
peptide, (RXR)4XB, was...
Pyrenophora tritici-repentis (Ptr) is the causal agent of the disease tan spot of wheat,
which can be responsible for the destruction of up to 50% of a wheat crop harvest.
Tan spot disease results in chlorotic and/or necrotic lesions triggered by the
pathogen’s production of one or several host-selective toxins...
An inducible, mutant virus, designated vvtetO:I7L/G1L, was used to study the morphogenic proteolysis step of the vaccinia virus life cycle. The vvtetO:I7L/G1L controlled the expression of two genes, I7L, a cysteine proteinase, and G1L, a putative metalloproteinase. These proteins are involved in the maturation of viral core proteins, p4a, p4b,...
The Chlamydiaceae are a family of obligate intracellular bacteria with a unique biphasic developmental cycle. The replicating, metabolically active, intracellular phase bacteria (RBs) grow within a cellular vacuole know as the inclusion. Since the proteins the Chlamydiaceae secrete into this membrane are the means of host/parasite interaction, they have long...
The purpose of this project was to isolate gabosines and other compounds through chemical screening of secondary metabolites of Streptomyces cellulosae subsp. griseorubiginoses strain S1096. Two different media were used to cultivate S. cellulosae. The first contained soybean and mannitol. The other contained oatmeal and trace element solution. After cultivation...
Non-insulin dependent diabetes mellitus (NIDDM), commonly known as type 2 or
delayed onset diabetes, is a recognized growing global epidemic, which is connected to cultural and behavioral factors, such as diet, exercise, obesity, and genetics. In a recent survey of both men and women in Mexico City, the prevalence of...
The Sortase A (SrtA) enzyme is a potential target for a new class of anti-infective drugs
because it is responsible for anchoring virulence factors to the surface of pathogenic,
Gram-positive bacteria such as Staphylococcus aureus. High throughput screening
yielded low molecular weight compounds that inhibit purified SrtA from S. aureus....
Tomato is considered to be one of the most important vegetables for its value as a source
of nutrients and antioxidants, and as a model crop for biological research, including seed
biology. In this thesis, tissue-specific gene expression and its regulation in tomato seeds
were analyzed to understand the mechanisms...
The endoplasmic reticulum (ER) is a crucial organelle in the cell where protein folding and processing occurs, and conditions that negatively affect ER functions are highly detrimental to the cell. The accumulation of unfolded/misfolded proteins in the ER leads to a condition known as ER Stress. The ER has developed...
The Supreme Court Bar-the lawyers who argue before the US Supreme Court-has historically been an elite and exclusive group. This investigation examines the demographic make-up of the Supreme Court Bar in the Roberts Court and compares it to previous iterations of the Supreme Court Bar, as well as the national...
This dataset contains DNA sequence data of Oncorhynchus species, isolated from environmental DNA (eDNA) from Pacific Northwest streams via microfluidic eDNA metabarcoding and high-throughput (Ilummina) sequencing (samples collected from 2017-09-22 to 2017-10-10). It is accompanied by scripts and commands for data analyses including: sequence denoising, calculation of entropy values by...
A concern which has restricted the use of parthenocarpic pickling cucumbers in the
United States has been firmness of fruit processed by brining. Fruit firmness and defects
of parthenocarpic and nonparthenocarpic pickling cucumbers were evaluated in 1992 and
1993. Fruits were produced with or without pollination by growing plants with...
Let K be a cyclic number field of prime degree ℓ. Heilbronn showed that for a given ℓ there are only finitely many such fields that are norm-Euclidean. In the case of ℓ = 2 all such norm-Euclidean fields have been identified, but for ℓ ≠ 2, little else is...
1,4-Dioxane (dioxane) is a probable human carcinogen and is often found comingled with chlorinated aliphatic hydrocarbon (CAH) contamination since dioxane is used as a stabilizer in CAH solutions. Dioxane is miscible in water, has a low K[subscript ow], low H[subscript cc], and is highly recalcitrant in the environment. The presence...
In this study an improved model of biomass and nutrient estimation of coastal Douglas-fir (Psuedotsuga menziesii) in the Pacific Northwest has been developed across a wide range of stand management regimes. This study quantifies and defines the type and intensity of biomass harvest and associated removal for actively managed stands...
The imposing andesite stratovolcano is the characteristic expression of subduction zone magmatism, posing hazards to coastal populations and bearing insight into deep Earth processes. On a map of a typical volcanic arc, one can easily distinguish the approximately linear alignment and regular spacing of these major edifices that stand out...
E. coli thioredoxin (TRX) was modified by the episulfonium ion derived from S-(2-chloroethyl)glutathione (CEG) or S-(2-chloroethyl)cysteine (CEC). The alkylation site was located at Cys-32, which was confirmed by tandem mass spectrometry. Two forms of native TRX, Oxi- and Red-TRX, and two modified TRXs, GS- and Cys-TRX, were examined by hydrogen/deuterium...
Two new concepts have been explored in solving the neutron
diffusion equation in one and two dimensions. At the present time,
the diffusion equation is solved using source iterations. These
iterations are performed in a mathematical form which has a great
deal of physical significance. Specifically, the neutron production
term...
Kentucky bluegrass (Poa pratensis L.) cultivars are known to differ quantitatively in their photothermal floral inductive requirements. The extent to which these requirements are met influences the potential for subsequent panicle exsertion. A better understanding of the inductive requirements as they vary among cultivars would aid in the selection and...
Rapid tiller and root production can improve seedling survival and
benefit stand establishment of perennial ryegrass (Lolium perenne L.)
in commercial seed fields. Environmental conditions after establishment
and inherent morphological factors combine to reduce the commercially
harvested yield below the theoretical potential yield.
These studies were conducted to determine if...
In this report, three studies are presented that aid in the development of drug discovery and their synthesis. In each, the importance of the marriage between computations and experiments is highlighted. Continued efforts in this vein are essential for future efforts towards improving human health.
The first case study investigated...
Livestock grazing has been indirectly related to sage-grouse (centrocercus
urophasianus) declines in the western United States and southern Canada; however,
there is a lack of scientific research that directly relates the two. Our objective was
to investigate the influence of livestock herbivory on sage-grouse nesting habitat by
determining the spatial...
Wildfire exclusion over the past century or more has resulted in extensive fuel accumulations throughout much of the West that combined with recent climatic patterns have increased the frequency of relatively uncommon, large, high-severity wildfires. Forest restoration treatments intended to alter landscape-level fire disturbance patterns can be difficult to implement...
The natural gas industry has become essential in many areas in the United States. Currently there is over 37.5 million miles of natural gas distribution lines. A large majority of these lines are polyethylene pipes. With such a large percentage of polyethylene lines in use gas companies are continually looking...
A partially automated radio-tracking system with semi-continuous
azimuth data collection and XYLOG5 and MAP computer programs for azimuth
data analysis was used for studies of California quail (Callipepla
californica) at the E.E. Wilson Wildlife Area, Oregon, in 1988 and 1989.
Movements of 58 hens were monitored daily to determine nest...
Reactor refueling is a computationally intensive
problem solving process that requires automation since
significant resources are expended upon the search for
an optimal core loading. Without imposing some
constraints upon the configurations investigated, an
extremely large number of prototype loadings may be
generated without discovery of an improved loading. As...
Larix laricina in Alaska occurs on sites ranging from productive
slopes and riverbottoms to wet bogs underlain by permafrost. It is
largest on sites without permafrost, where it is associated with
Picea glauca, but is much more common in bogs, where it occurs with
Picea mariana. In this study, I...
Cnidarians, such as anemones and corals, engage in an intracellular symbiosis with
photosynthetic dinoflagellates. Corals form both the trophic and structural foundation of
reef ecosystems. Despite their environmental importance, little is known about the
molecular basis of this symbiosis. In this dissertation we explored the cnidariandinoflagellate symbiosis from two perspectives:...
Azaspiracid has generated an enormous amount of scientific interest in the fourteen years since its initial discovery. The structure contains a 6,5,6 bis-spiroketal, a [3.3.1] bicyclic ketal and a 6,5-spiroaminal linkage as key moieties. With 9 rings, 20 stereocenters and three alkenes, the azaspiracid immediately attracted the interest of the...
Vegetation patterns and species distributions are strongly linked to soil moisture regimes, and populations within a species from contrasting climatic regimes could exhibit differences in the degree to which certain functional traits related to establishment are expressed. Tree seedling survival is crucial for forest regeneration, and thus may be a...
Earth’s mantle extends to nearly 3000 km depth, comprises >80 % of Earth’s total volume, and has the largest influence on the primordial and radiogenic heat budget. Despite its importance, the structure and composition of the mantle is still debated. There are three primary models for Earth’s mantle structure that...