Much has been accomplished in the last few years
toward the conservation of natural resources, and in
this work the engineer has taken a leading part. The
prevention of unnecessary waste, the utilization of
hitherto useless by-products, and the economic production of the world's necessities are important features of this...
Nitrogen is one of the most important nutrients influencing
potato yields. The potential for environmental pollution from N is
also greater than for other nutrients added as fertilizer because
excessive amounts applied are subject to leaching into drainage water.
The purpose of this study was to improve N fertilizer recommendations...
A major objective of this investigation was to determine the
possible roles, if any, of poly-β-hydroxybutyrate and products of
its metabolic breakdown in symbiotic nitrogen fixation by nodule
bacteroids. Changes in poly -β- hydroxybutyrate content and in
activities of nitrogenase, β-hydroxybutyrate dehydrogenase, and
isocitrate lyase were studied under various conditions...
The process of biological nitrogen fixation involves the enzymic
reduction of atmospheric nitrogen (N₂) to ammonia (NH₃). The
enzyme which catalyzes this reduction, nitrogenase, does not exhibit
a high degree of substrate specificity. It also catalyzes the reduction
of acetylene (C₂2H₂) to ethylene (C₂H₄). The reduction of
C₂H₂ to C₂H₄...
Nitrogen fixation in both natural and domestic grasslands of Oregon was studied using the acetylene reduction assay. A substantial number of these tests made gave positive acetylene reduction activity. Rates in the range of 60g N₂ fixed/ha/day were observed for some Agrostis species. Assuming that this rate proceeds for 100...
This study examines several aspects of nitrogen fixation by
Purshia tridentata (Pursh) D. C., a rosaceous shrub widespread in the
central Oregon pumice region, especially as an understory species in
Pinus ponderosa and Pinus contorta forests. Anatomical studies of
root nodules under the light microscope revealed strong similarities
to other...