Wheaton College (MA) Digital Repository
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Average length of axons before, during, and after incubation with DMEM and DMEM with methylmercury.
Get PDF10 pages; color illustrations.Includes bibliographical references
Small pond ecology : eutrophication, alternative stable states, and management options.
No full textvi, 102 leaves.Bibliography: leaves 98-102."Nutrient pollution is a growing problem for freshwater bodies around the world. Cultural eutrophication associated with nutrient pollution can lead to unhealthy ecosystems with a lack of oxygen and biodiversity. This study compares three small ponds in Massachusetts to determine their trophic status, measured by water chemistry and biological indicators. Based on these criteria, Gilmore and Peacock Pond have been identified as eutrophic systems, but Wildcat is not. Eutrophic ponds can enter one of two alternative stable states, and Gilmore and Peacock Ponds reflect each of these. Gilmore Pond is in a turbid, phytoplankton dominated state, and Peacock Pond is in a clear-water, macrophyte dominated state. Wildcat Pond lies in between these two extremes, with a moderate amount of both phytoplankton and macrovegetation. Management strategies to pull Gilmore Pond out of this turbid state by reestablishing bottom vegetation are described, but ultimately I would advise managers of Gilmore Pond against taking an active approach. Gilmore Pond is a satisfactory ecosystem, and the costs of management are not likely to outweigh the benefits.
Methylmercury and amount of endocytic activity in chick embryonic glial cell.
No full text5 pages; color illustrations.Includes bibliographical references
Degree of polyglutamylated tubulin in proximal axonal regions in relation to distal branched axonal and un-branched axonal regions.
No full text14 pages; color illustrations.Includes bibliographical references
Characterization of vegetal plate cilia during echinoid gastrulation.
No full texti, 81 leaves : illustrations
Bibliography: leaves 76-81.The objective of the present study was to characterize the growth, differentiation, lifecycle, and orientation of vegetal plate cilia during Echinoid gastrulation. Focus was placed on the role these cilia might play in PCP signaling during early embryonic development. Cilia at the vegetal plate were quantified for orientation, length, and retraction rate in order to better characterize the cilia in this region. In addition,methodologies for the immunofluorescence labeling of basal bodies were developed in order to better characterize the establishment of planar cell polarity at the vegetal plate during gastrulation. The data show that the archenteron cilia in both Strongylocentrotus purpuratus and Dendraster excentricus are motile. In addition, the results suggest that planar polarity establishment at the vegetal plate is a gradual process, while the length transition from lateral to vegetal cilia is abrupt. Finally, the data suggest that two distinct rates of ciliary retraction occur at the vegetal plate
