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Call timing interactions, aggressive behavior, and the role of acoustic cues in chorus formation in treefrogs
(University of Missouri--Columbia, 2008)
I studied calling patterns and aggressive behavior of the Bird voiced treefrog, , to assess how dynamic call characters influences males and the factors influencing the onset of choruses and settling patterns of males in ...
Pollen-pistil interactions in nicotiana
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] To screen for potential mates, angiosperm pistils provide a physical and biochemical barrier that promotes the growth of desirable pollen while ...
Chromatin-level regulation of the maize purple plant1 gene
(University of Missouri--Columbia, 2008)
In eukaryotes, gene expression is controlled at the chromatin level by mechanisms that are not yet well understood. This study addressed some of the unanswered questions about chromatin-level gene regulation. In maize, the ...
Characterization of an in vitro neural stem cell niche with educational component : stem cells and society
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] We describe a novel neural stem cell (NSC) culture system, derived from embryonic stem (ES) cells, that maintains and expands a population of neural ...
Role of non-hypophototropic hypocotyl[3] (NPH[3]) in regulation of phototropism in Arabidopsis
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Light is arguably one of the most important environmental factor that not only provides the plant with its energy needs but also cues to modulate its ...
Insights into phototropic signaling : a study of the unusual attributes of a hyper-phototropic mutant
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Many questions persist about the nature of and components associated with the initial signaling events that follow light perception for phototropism. ...
Interaction of RNA polymerase II and the RNA silencing machinery in heterochromatin formation of Drosophila
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] The eukaryotic chromosome is composed of two structurally and functionally distinct compartments. The loosely packaged region is known as the euchromatin, ...
A multi-scale investigation of ecologically relevant effects of agricultural runoff on amphibians
(University of Missouri--Columbia, 2008)
Modification of landscapes for agricultural production can introduce agrochemicals into surface waters and degrade aquatic habitats used by many amphibians for breeding and larval development. Although many ecotoxicological ...
Behavioral endocrinology of female gray treefrogs, Hyla versicolor, in response to acoustic stimulation
(University of Missouri--Columbia, 2008)
Particularly in organisms with a limited breeding period, females must rely on both external and physiological cues to regulate the phenology of reproduction and behavior. I investigated the relationship between male ...
Regulation of ceramide synthase 1 in cellular stress response
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Ceramides are intimately involved in a wide range of cellular processes. In mammals, de novo ceramide synthesis is catalyzed by the 6 ceramide synthase ...
Role of transmembrane protein strabismus in motor neuron migration in the zebrafish hindbrain
(University of Missouri--Columbia, 2008)
Nervous system development involves extensive cell migration, causing immature neurons to move from proliferative zones to specific locations to generate functional circuits. Defective in neuronal migration can cause severe ...
Generating temperature sensitive inteins for studying gene functions
(University of Missouri--Columbia, 2008)
Reversible and easy to use, temperature-sensitive (TS) mutations, are powerful tools to study the functions of all genes, including essential and pleiotropic ones. However, the rarity of TS alleles and the difficulty of ...
The evolutionary significance of developmental plasticity in the communication system of Neoconocephalus triops (Orthoptera: tettigoniidae)
(University of Missouri--Columbia, 2008)
The katydid Neoconocephalus triops is a tropical species that extended its distribution range to North America. In North America, males display developmental plasticity in mating calls between reproductive generations: the ...
Regulation of plant development in Arabidopsis
(University of Missouri--Columbia, 2008)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] The development of a complex organism, such as a plant, requires the function of multiple pathways that regulate various aspects of the developmental ...
Mating systems in Nicotiana longiflora and N. Plumbaginifolia : the effect of interspecific interactions
(University of Missouri--Columbia, 2008)
The research presented here was focused on the effects of interactions between Nicotiana longiflora and N. plumbaginifolia on their mating systems. First, I conducted a series of observations and pollination experiments ...
Effects of riparian buffer width on stream salamander populations in the southern Appalachian Mountains
(University of Missouri--Columbia, 2008)
Salamanders in the Appalachian region have been extensively studied, but the majority of research assessing the impacts of logging has focused on terrestrial species that are not dependent on stream habitats for egg ...
Spinal cord injury induces changes in ion channels of reticulospinal neurons in larval lamprey
(University of Missouri--Columbia, 2008)
After spinal cord injury in larval lamprey, RS neurons regenerate their axons (Davis and McClellan, 1994a,b), restore synaptic contacts and most of the original locomotor functions (McClellan, 1998). It was previously ...