The temporal and spatial characteristics of the plume produced
by a laser microprobe, are dependent upon the composition and pressure
of the atmosphere surrounding it. It has been shown that certain atmospheres
can enhance the analytical signal by increasing the free
atom lifetime.
Improvements were made to the existing laser...
An instrument was constructed to measure molecular fluorescence (FL) or chemiluminescence (CL) and absorbance (ABS) simultaneously. The lower, middle, and upper portions of the test solution are probed to obtain ABS, FL, and CL data. Optical fibers are used extensively. The ABS and FL or CL spectra are acquired in...
PART I. The concentration of nickel in some soils may be
insufficient to meet the requirements of enzymes such as
urease in soybeans and hydrogenase in Rhizobium. Nickel
availability in soils was examined by measuring microbial
urease activity in soils which were treated with glucose
and urea. Supplemental nickel was...
Published June 1987. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
About 7,000 years ago two major tephra-falls blanketed the
Pacific Northwest in volcanic ash. These two tephra-falls, identified
as the Llao and climatic tephra-falls, were a part of the eruptive
events that led up to the collapse of Mount Mazama to form Crater Lake
in the southern Oregon Cascades.
The...
The Miridae, or plant bugs, associated with noble fir, Abies
procera Rehd., are discussed. Thirty six species of the Miridae were
collected from noble fir. Twenty five of these species are considered
only "visitors" to noble fir. The study does not deal with these
species. Noble fir is a host...
This study was conducted to observe the manner in which three local
public interest organizations participated in a local, environmentallyoriented
decision process. The study period began in December, 1978,
with the passage of a revised solid waste ordinance (Ord. 78-102) for
the City of Corvallis, OR. The main forum for...