Using combined HPLC-RIA, cytokinin levels in a series of tobacco crown gall tumors, having altered morphologies as a result of transposon mutagenesis were examined. Average trans-ribosylzeatin levels in the shoot-producing tumors (tms mutants) and root-producing tumors (tmr mutants) were 1400 pmol/gm and 0.97 pmol/gm, respectively. Cytokinin/auxin ratios were highest in...
A majority of eighteenth-century novels remain in regular print over two hundred years since their inception. Yet with the possible exception of Robinson Crusoe, they have largely fallen out of popularity, rarely appearing on "The Summer's Hottest Reading" lists or receiving celebrity endorsement. I consider Ian Watt's foundational study, The...
This thesis presents a hydrogeologic study of the Parrett Mountain Region,
located approximately 20 miles south of Portland, Oregon. The aim of the study was
to investigate the impacts of Columbia River Basalt on the regional groundwater
system, to expand our understanding of flow through fractured basalt, to improve
management...
This dissertation introduces a new idea for frequency
domain deconvolution of speech signals. The idea is to
approximate a unit sample by a Gaussian pulse. The
deconvolution is performed by designing a glottal inverse
filter that will estimate the excitation of the vocal tract.
Then, the excitation will be used...
Linear phase variable filters that are obtained with a frequency transformation of the form cos(ω) = P(cos(W)) were analyzed, where P is a finite degree polynomial, ω is the prototype frequency and W is the transformed filter frequency. A new transformation of third order is proposed. The new variable filter...
The purpose of the study was to compare the visual-motor performance
of college students who reported ingestion of certain drugs with
those college students who reported no drug ingestion. The study
drugs included the following drugs or groups of drugs: tobacco,
alcohol, marijuana, LSD, mescaline, barbiturates, and amphetamines.
A total...
Agrobacterium tumefaciens is a common soil bacterium that causes crown gall
disease on many dicotyledonous plant species. It has been exploited for use in genetic
engineering because it is able to promote transfer of any DNA segment to plant
chromosomes. Many molecular factors in both the plant and bacterium contribute...