The root-lesion nematode, Pratylenchus penetrans (Cobb 1917).
Filipjev and Shuurmans Stekhoven, 1941, is widely distributed throughout
Oregon and other temperate zones of the world. Economically
it is probably the most important plant parasitic nematode in Oregon
because of its abundance, wide host range of economic plants and
interactions with other...
An investigation was undertaken to determine whether
potassium is indeed necessary for the in vivo synthesis of a
specific protein. The effects of univalent cations on the
inductive formation of nitrate reductase and on the level of
activity of representative non-adaptive enzyme are presented.
Cultures of Neurospora crassa were grown...
It has been undertaken here to use the matrix method of
structural analysis for the determination of the stability of elastically
restrained, simple portal frames. This involves the formulation of
the stiffness matrix of the structure in terms of the axial force in the
members. The stability criterion, when applied...
The response of three-dimensional frames subjected to an arbitrary
dynamic force is studied. The method of mode superposition
is used to obtain the frame response solution. Two different modeling
systems are used to idealize the frame. These are the "discrete
mass system" and the "continuous mass system." For an example...
The effects of vertical ground motion are particularly significant
in the design of highway bridge girders. Conventional codes do
not recommend methods for solving the problem. The intent of this
work is to suggest an approach for such design.
A set of curves for velocity spectra which are the average...
This thesis presents a matrix analysis of structures
with semirigid connections. The stiffness factor of a
connection has been assumed to be a constant as represented
by the initial relationship of moment versus
rotation. Three cases are considered: Case I - structures
with semirigid connections, column width and beam
depth...
Experiments are reported which demonstrate that a cobalt deficiency
in R. meliloti results in a decreased cytochrome content of
bacterial cells. It is concluded that the effect of cobalt deficiency
on cytochrome content of Rhizobium cells and on the leghemoglobin
content of nodules possibly may be explained by an effect...
This study was designed to evaluate the relative effectiveness
of a new college general biology course which utilized an audio -
tutorial laboratory as contrasted with a traditional lecture course.
Five biology classes with 720 students at the Kansas State
Teachers College in Emporia, Kansas, participated in the study.
The...
This thesis reports a portion of a general ecological study of
a stream under conditions of controlled flow and low levels of organic
enrichment. It is concerned with the effects of experimental variations
of light intensity and concentration of soluble organic enrichment
imposed on seasonal variations of temperature and total...
A method of treating resonance captures for few energy group
calculations is developed using the Narrow Resonance-Infinite
Absorber approximation to the resonance integral. The application
of this method is not restricted to this approximation, however,
as other approximations to the resonance integral could also be
used.
The approach presented defines...