In the construction of a cab-over-engine semi tractor, Freightliner
Corporation of Portland, Oregon uses brackets to make the connection
between the front leaf spring mounts, bumper, front hinges
for the tilt-cab and the longitudinal frame rails. One bracket is used
on each side. The integrity of these brackets is essential...
Laboratory experiments were used to investigate the mechanism
of plant response to water stress by determining the sensitivity of leaf
elongation, photosynthesis and transpiration in young corn plants to a
decrease in leaf water potential.
In initial experiments, 9 day old corn plants were grown at soil
water potentials of...
The effects of soil moisture (-2 to -17 bars), temperature (5 to 20°C), bulk density (0.90 to 1.40 gm/cm³) and texture (Bashaw silty clay and Woodburn silt loam) on germination and seedling emergence of three varieties (Yamhill, Bezostaya, Kirac 66) of wheat (Triticum Aestivum, L.) were evaluated under laboratory and...
The polyunsaturated fatty acids (PUFA) are known to be required
for larval growth and normal wing development in several
species of Lepidoptera but most of the basic information necessary
for a complete understanding of this nutritional phenomenon has not
been gathered. This includes the role of each of the essential...
Previous investigations have shown that the enzymes
catalyzing the biosynthesis of the gibberellin-type of hormones
from mevalonic acid in plants are compartmentalized
in plastids. Moreover, the activity of one of the key
enzymes in the biosynthetic sequence, kaurene synthetase,
exhibits markedly enhanced activity when a dark-grown pea
seedling undergoes de-etiolation...
During 1975 and 1976 a sedimentation study was conducted in the Bear Creek watershed, located in the southeastern corner of central Oregon's Crook County. A Rocky Mountain infiltrometer was used to simulate high intensity rainfall over 468 sedimentation plots. Rainfall and runoff were measured and a sample of the runoff...