The organization of behavioral activities in time is important
to a bird's survival and reproduction. To be successful, either
proximately or ultimately, a bird must apportion its behavior in time
so that it may obtain sufficient energy for maintenance activities and
for such activities as migration and reproduction. The organization...
The primary objective of this thesis is to study, characterize
and compare four types of Scenedesmus obliquus pigment mutants with
the wild-type strain. The specific nature of the carotenoids synthesized
in both heterotrophically and myxotrophically-grown cells, Hill
reaction activity, photoreduction activity, and total photosynthetic
activity of these cells are examined....
Under adverse soil moisture conditions a critical water stress
or water potential develops in the plant and productivity is reduced,
or in extreme cases, terminated. Research to determine the soil
moisture status for maximum production of specific crops has been
conducted for decades. The results have done much to increase...
Some effects of 171β-estradiol on ovine luteal function were
studied in five experiments.
Estradiol injected into ewes on days 11 and 12 of the estrous
cycle caused luteal regression in both intact and unilaterally hysterectomized
ewes indicating that the presence of one uterine horn permits
estradiol to cause luteolysis comparable...
The purpose this study was to determine how group counseling
influenced attitudes of low-income youth toward self, others,
and society. The subjects, all high school age, were participants
in an education program held on a college campus during the 1970
regular collegiate summer session. They lived in a residence hall...
This exploratory study was undertaken to determine the combined
effects which two rather unique approaches in the fields of counseling
and psychotherapy might have on the behavior and academic achievement
of ten selected deviant high school students. These approaches have
been termed the 1) self-consistency approach to behavior change and...
Yield reductions due to competition of weeds with crop plants
can be extremely important. Early weed competition can be as important
in reducing crop yield as weed competition for the entire
season.
The objectives of this study were (1) to determine the weed
control achieved by narrow row-cropping patterns, (2)...
The nature of the interaction between juvenile coho salmon, Oncorhynchus kisutch (Walbaum), and fall chinook salmon, 0. tshawytscha (Walbaum), was studied in Sixes River, Oregon. Seining, snorkeling, and tagging were used to determine distribution and patterns of growth of these two species in the stream environment. Experiments conducted in flowing-water...