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...
NADPH-cytochrome P-450 reductase, an important enzyme in the
cytochrome P-450-dependent microsomal monooxygenase system, was
purified from insecticide-resistant (R) and -susceptible (S) house
flies (Musca domestica, L.) and from the black blow fly (Phormia
regina, Weigen). Proteolytic degradation to a P-450 - inactive form
of the reductase was reduced during the...
Soils of 49 agricultural and 2 "native condition" sites in the Lower Umatilla Basin,
Oregon were sampled for nitrate-nitrogen, ammonium-nitrogen, chloride, and pH
beginning in Fall of 1992. Several sites were sampled in Spring and Fall 1993 in order to
indicate movement or loss of residual soil nitrogen over time....
Batch cultures of Candidatus Pelagibacter ubique were grown under iron-, organosulfur-, and nitrogen-limiting conditions to understand how this ubiquitous marine bacterium responds to and interacts with environments where growth is limited by the availability of these nutrients. Global gene expression was monitored using microarrays and quantitative mass spectrometry to observe...
Streams and rivers play a critical role in global carbon (C) cycling by processing, storing, and transporting C. Headwater streams which make up more than 95% of the length of streams and rivers worldwide have disproportionate influence on fluvial C dynamics. The hyporheic zone (HZ) of headwater streams is a...
The increasing human demands on natural resources, in combination with uncertainties about ecosystem dynamics due to global change, has led the scientific community to conclude that new approaches in understanding of ecological systems are needed to tackle environmental issues in an efficient manner. One development that has received more attention...
This thesis describes a Mossbauer effect and electron
paramagnetic resonance study of iron (III) tetraphenylporphyrinatobenzenethiolate
benzene thiol, an analog compound
for bacterial cytochrome P-450. The compound is unusual in
that it provides a model for the two ferric reaction states
of cytochrome P-450. The iron in the model compound exhibits...
Forest soils and topography have long been known to influence forest productivity in complex terrain such as Oregon’s Coast Ranges. Incorporating physical site characteristics into predictions of forest growth and yield, however, has been problematic because of the high spatial variability of soil properties and the challenges associated with representing...
What constitutes quality of learning in primary care? A
social systems view of that central question regards the
relationships between dimensions of learning, purposes of
primary care, and quality of practice. The question of
learning quality was approached in three ways. First,
perceptions of learning quality were elicited through
recorded...
Biotic and abiotic processes at continent-ocean interfaces cycle a disproportionate mass of carbon and nutrients relative to their global surface area, and microbial activity is a principal determinant of organic and inorganic matter flux in these transition zones. Most studies using modern high-throughput ‘omics techniques to link microorganisms with costal...