Three studies were conducted to characterize and present early-seral
competition between Douglas-fir seedlings and the surrounding vegetation
communities during Pacific Northwest forest establishment. The first experiment
served as the foundation for this dissertation and was designed to quantify tradeoffs
associated with delaying forest establishment activities by introducing a fallow year...
This study investigated the influence of perceptual training on
volleyball serve-reception performance. The subjects were ten female high-school
volleyball players. Subjects were randomly assigned in equal
numbers to a control or an experimental group.
Both groups were tested on two occasions, prior to and following a
three-week perceptual training intervention....
For coaches to qualitatively analyze the performance of sport skills as executed by their
students, they must possess an internal image of the desired skill against which to make
comparisons (Hoffman, 1983; Pinheiro & Simon, 1992). Leas and Chi (1993) have
indicated that there are differences between novice and expert...
This study investigated the relative effectiveness of
three instructional strategies on the learning of an overarm
throw among preadolescent females. Subjects were randomly
assigned to one of the following instructional strategies:
a correct model supplemented with verbal cues, a learning
model supplemented with verbal cues, and verbal cues only.
The...
Although research evidence clearly indicates support surface properties are a major factor contributing to fall risk among the elderly, investigations examining the influence of variations in surface conditions on the postural control of older adults during task performance have been limited. Thus, the primary purpose of the present studies was...
Respiratory infections caused by nontuberculous mycobacteria (NTM), especially Mycobacterium avium, can lead to progressive, recurrent disease that is refractory to therapy. Bacterial biofilms are intrinsically resistant to a variety of stressors and pressures, including host killing mechanisms and antibiotic therapy. Though it is becoming increasingly evident that NTM biofilms are...
There is considerable variation among rose varieties in susceptibility
to mildew, and as a result of maturation, leaves of most
susceptible varieties become resistant to infection. The nature of
resistance has been sought in various studies involving environmental,
morphological, and physiological factors. An attempt was made in the
present investigation...
Abstract Valleys of headwater channels in the Oregon Coast Range impound significant amounts of sediment, with the majority of deposits originating as debris flows. Headwater valleys function as transitional sedimentary reservoirs linking hillslope sources in active orogens to sinks in sedimentary basins, yet the residence time of deposits in the...