The major historical studies that have examined American
biology have emphasized the development of experimental biology at
the end of the nineteenth century. In this characterization, the
descriptive branch of biology has often been treated as less than
important and, in several cases, as a hindrance in the application
of...
Sediment yield increases following timber harvest and road construction
were predicted for four Pacific Northwest experimental
watersheds. Sediment yields were predicted using a handbook developed
by the U.S. Forest Service entitled, "An Approach to Water Resources
Evaluation of Non-Point Silvicultural Sources" (WRENS). Predicted
sediment yield increases varied from 40 to...
Efficiency of nitrogen fertilizer uptake by soft white winter
wheat (Triticum aestivum L.) was measured over two cropping seasons
across a range of soils and cropping histories in the Willamette
Valley. Fate and potential losses of applied nitrogen were also
assessed over a seventeen month period.
In both cropping seasons,...
Research Objective: Nearly 60 million people in the United States reside in a rural area. Residents in rural areas have higher rates of chronic disease, risky health behaviors, disability, infant mortality, and age-adjusted mortality than their urban counterparts. Health insurance and access to care mitigate those risks, in part because...
Managing rangelands with livestock grazing is a tool that can be applied to obtain vegetation management objectives. Animals utilize available resources, which vary in quantity and quality, across the landscape. Their movements are adjusted to the spatial and temporal heterogeneity of resource distribution. Controlling livestock distribution is fundamental to economically...
Flood plain regulations are one of six major adjustments
used to cope with flood hazard in the United States. This adjustment
was essentially neglected in the national flood hazard policies
until Congress enacted the National Flood Insurance Act of 1968.
The implementation of regulations, as called for in the Act,...
The toxicity of chlorobenzene (CB) was investigated in rainbow
trout following acute ip administration (1. 0 ml/kg, 1:1 in corn oil)
and chronic exposure (2. 1 ppm and 2. 9 ppm) via the water in a continuously
flowing system for 15 and 30 days.
In the acute study, overt toxicity...
Carter Lake, a freshwater, coastal dune-margin lake,
was sampled at the beginning and end of the summer of 1986
to determine the sediment characteristics and benthic
macroinvertebrate abundance, biomass, variety, and
diversity. The distributions of major benthic habitats were
estimated by snorkeling in June and July, 1986. Water
temperature and...
The hepatotoxicity of CB was studied in the Sprague-Dawley rat and rainbow trout. In rats, an ip dosage of 9.8 mmol/kg CB (~̲ LD10) produced evidence of liver toxicity over a 72 hr time course. Sulfobromophthalein (BSP) retention maximized 3-16 hr post treatment and normalized after 72 hr whereas plasma...
