Showing 451 - 460 of 583 Items

Modeling Oyster Growth Dynamics in FLUPSY Systems to Develop a Decision Support Tool for Seed Management

Date: 2023-01-01

Creator: Gretchen Clauss

Access: Open access

As the Gulf of Maine warms and lobsters move north to colder waters, Maine’s working water front has begun to diversify. There is a thriving new ecosystem of aquaculturists looking to keep Maine’s waterfront traditions alive in a lasting, sustainable way. One of the most popular aquaculture industries is oyster farming. With an increasing number of oyster farms developing in Midcoast Maine each year, we seek to develop a decision support tool to aid farmers in seed management. Oyster farmers can choose weather or not to use an upweller on their farm, and our goal is to provide guidance on this choice, as well as on upweller management. We begin by culminating and synthesizing data from previous literature and oyster farmers. We then use this data to first build a basic analytical model of a cohort of oysters based on an exponential growth model. We expand this model to include biological differences among oysters as well as management practices. Finally, we walk through a case study, illustrating how our tool could be used to make seed management decisions on an individual farm scale.


Solvent Effect on Excited State Proton Transfer Mechanism of 8-Amino-2-Naphthol

Date: 2021-01-01

Creator: Gabrielle Vandendries

Access: Open access

Photoacids, compounds that undergo excited state proton transfer (ESPT), have been utilized in different solar energy and lithographic applications.1, 2 The addition of functional groups and solvent can both change the ESPT mechanism of photoacids. In this study, the effect of solvent on the ESPT mechanism was explored using a model diprotic photoacid, 8-amino-2-naphthol (8N2OH). The photochemistry of 8N2OH in water and common nonaqueous solvents, acetonitrile, tetrahydrofuran (THF), and methanol, were studied using UV/Vis absorption, steady-state emission, and time-correlated single photon counting (TCPSC) emission spectroscopy. The results were analyzed using the Kamlet-Taft parameters. It was found that the ESPT mechanism of the cation in water is different from the mechanism in acetonitrile and THF. In water the excited cation forms the zwitterion, i.e. the OH site undergoes ESPT, while in acetonitrile and THF, the excited cation forms the neutral species, i.e. the NH3+ site undergoes ESPT. No ESPT was observed for 8N2OH in methanol. The effect of solvent mixtures on photoacidity was also investigated using acetonitrile and water mixtures. The solvent effects were more subtle; the time-resolved emission measurements showed the greatest stabilization of the excited neutral 8N2OH species at 20/80% acetonitrile-water mixtures. Finally, the ability to extend the solvent studies to ionic liquids, 1-ethyl-3-methylimidazolium (Im) trifluromethanesulfonate (OTF), was demonstrated. The combined studies reveal that solvent plays a large role in determining the ESPT mechanism and stabilization of 8N2OH.


Miniature of Characterizing the exhumation path of the first ultrahigh-pressure terrane in North America
Characterizing the exhumation path of the first ultrahigh-pressure terrane in North America
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      Date: 2015-05-01

      Creator: Zachary FM Burton

      Access: Access restricted to the Bowdoin Community



        Genetic Analysis of Cellular Adhesion in Arabidopsis thaliana

        Date: 2021-01-01

        Creator: Andrew Close Bolender

        Access: Open access

        Plant cell adhesion is mediated by the extracellular matrix (ECM) or cell wall and plays an important role in plant morphogenesis and development. The amount, modification, and cleavage of pectin in the cell wall are major contributors to the adhesive properties of the ECM. To gain a more complete picture of plant cell adhesion processes, Arabidopsis thaliana seedlings were previously mutagenized and screened for hypocotyl adhesion defects. Genomic sequencing of one plant exhibiting an adhesion defect, isolate 242, showed that two mutations, one in cellulose synthase (CesA1) and another in a sugar transporter, are candidates for the causative mutation. This thesis reports that CesA1 is necessary for proper plant cell adhesion, while the sugar transporter encoded at At4g32390 is not. Dark grown seedlings homozygous for mutations in CesA1 stain in ruthenium red, indicating atypical adhesion, while those homozygous for null mutations in At4g32390 do not. Previous study of another adhesion mutant revealed ELMO1, a Golgi protein necessary for plant cell adhesion, and four additional homologs ELMO2-5 in the A. thaliana genome. Two of these homologs, ELMO2 and ELMO3, fused to GFP, colocalized with mCherry-MEM1 markers in the Golgi, but not mCherry-NLM12 ER markers, indicating that ELMO2 and ELMO3 are also Golgi proteins.


        Placemaking and Community-Building among Lesbian, Bisexual, and Queer (LBQ) Women and Non-Binary People during the Covid-19 Pandemic

        Date: 2021-01-01

        Creator: Gabby Unipan

        Access: Open access

        This paper draws on data collected through in-depth interviews with multi-generational participants recruited from various online sites to explore the place-making strategies among lesbian, bisexual, and queer (LBQ) women and trans- and gender-non-conforming people (tgncp) during the Covid-19 pandemic. Historically denied public space, placemaking in immaterial space (i.e., digital spaces) has been essential to the production and maintenance of communities for LBQ women and tgncp. Because these populations rely on non-traditional placemaking strategies that are not always instantiated in material space, sociologists often overlook their efforts to create place for themselves. This paper corrects this omission by exploring how communities create place through the deployment of subcultural capital onto immaterial space. Introducing four main strategies of community placemaking, material-constant communities, material-transient communities, immaterial-constant communities, and immaterial-transient communities, this article expands sociological conceptions of space to accommodate the placemaking strategies of marginalized communities who might lack the economic and political resources to foster communities in material spaces. Beyond the investigation of lesbian-queer placemaking, this research contributes to the growing sociological literature exploring the multifaceted, fluid, contested, and ephemeral nature of place and placemaking in the context of increasing Internet use.


        Miniature of The Lay Judge System: Following a Tradition of Maintaining the Status Quo or Forging a Path Towards More Reformation of the Justice System?
        The Lay Judge System: Following a Tradition of Maintaining the Status Quo or Forging a Path Towards More Reformation of the Justice System?
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            Date: 2015-05-01

            Creator: Alexandra Mathieu

            Access: Access restricted to the Bowdoin Community



              Miniature of Investigating the photoacidic properties of 8-benzylideneamino-2-naphthol
              Investigating the photoacidic properties of 8-benzylideneamino-2-naphthol
              This record is embargoed.
                • Embargo End Date: 2027-05-19

                Date: 2022-01-01

                Creator: Oliver M. Nix

                Access: Embargoed



                  Miniature of Ink
                  Ink
                  This record is embargoed.
                    • Embargo End Date: 2025-05-19

                    Date: 2022-01-01

                    Creator: Andrew MacGregor Nicholson

                    Access: Embargoed



                      Miniature of An analysis and characterization of Sonic Hedgehog and Fgf genes in <i>Danio rerio</i> embryonic tooth development
                      An analysis and characterization of Sonic Hedgehog and Fgf genes in Danio rerio embryonic tooth development
                      This record is embargoed.
                        • Embargo End Date: 2027-05-18

                        Date: 2022-01-01

                        Creator: Lauren Kanoelani Waters

                        Access: Embargoed



                          Miniature of Greening the Market: Natural Groceries from the Countercuisine to Whole Foods
                          Greening the Market: Natural Groceries from the Countercuisine to Whole Foods
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                              Date: 2022-01-01

                              Creator: Livia Kunins-Berkowitz

                              Access: Access restricted to the Bowdoin Community