Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 56 for “"Marine phytoplankton."”.
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Iodate Transformation By Marine Phytoplankton
… the oceans are partly under biological control. Phytoplankton are suspected to mediate the transformation of iodate to iodide via reduction by the enzyme nitrate reductase. However, there has been no direct evidence to support this hypothesis.</p> <p>The influence of phytoplankton on the …
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Marine phytoplankton in a high CO2 world
Marine phytoplankton is responsible for ~50% of global primary productivity, it supports the oceanic food web and affects biogeochemical cycles. I participated in a large mesocosm experiment that observed altered community structure and carbon drawdown in response to increased CO2. There was a 27% …
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Cobalt substitution for zinc in marine phytoplankton
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Cadmium, a toxin and nutrient for marine phytoplankton
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Production and Decomposition of Hydrogen Peroxide by Marine Phytoplankton
… regulation of H202 are largely unknown. Marine phytoplankton was examined for the kinetics of the production and decomposition of H<sub>2</sub>0<sub>2</sub> in the dark. Effects of varying environmental factors such as light, temperature, salinity, nutrients, amino acids, trace metals and …
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Application of Clustering Techniques to the Classification of Marine Phytoplankton
… The flow cytometry data was collected for marine phytoplankton. Two groups of data are used, one containing species that overlapped each other, and one containing independent species (non-overlapped). Ten clusters of 1000 records each are collated for each group, each record comprising of …
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Determining the effects of ocean perturbations on marine phytoplankton assemblages
… a dynamic, constantly changing environment for marine phytoplankton. Understanding the effects of these changes on phytoplankton assemblages is fundamental when trying to anticipate future responses of primary producer's community to long-term environmental changes. In this study, artificial …
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Genetic variability and differentiation in niche components of marine phytoplankton species
… in asexual reproduction rates in individual phytoplankton populations ranged from 3 t o 13% (coefficients of variation). There is no obvious relationship between the amounts of genetic variability in the populations and the variability or predictability of the environments from which they …
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Factors Affecting the Kinetics of Light Intensity Adaptation in Marine Phytoplankton
… been suggested that the recent light history of phytoplankton and the kinetics of photoadaptation can be used to provide information about the vertical mixing processes in the upper mixed layer. To be useful as a parameter in a model of photoadaptation and vertical mixing, the response of a …
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Analysis of chlorophyll fluorescence in marine phytoplankton : interpretation of flow cytometric signals
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1988.
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Neural Network Techniques for the Identification and Classification Marine Phytoplankton from Flow Cytometric Data
… approach to analysing flow cytometric data from phytoplankton cells. The superiority of radial basis function networks (RBF) over multi-layer perception networks (MLP), for data of this nature, has been established, and analysis of 62 marine species of phytoplankton represents an<br/>advancement …
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The direct implications of warming on the phenotype and underlying functional traits of marine phytoplankton
Marine phytoplankton mediate oceanic biogeochemical cycling by linking cellular metabolism with many elemental fluxes including C, N, P and Si. These elemental transformations are physiologically regulated processes that are influenced by phytoplankton phenotypes that change over different spatial …
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Thermal responses of marine phytoplankton: Implications to their biogeography in the present and future oceans
Phytoplankton are ecologically significant as primary producers and as regulators of the biogeochemical cycle. However, some may form harmful algal blooms that are a global problem due to the production of toxins that pose a risk to public health, the environment, and our economy. Climate change …
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The Impacts of External Nutrient Sources on Marine Phytoplankton in an Eastern Shore Sea-Side Estuary
… importance of freshwater sources in governing phytoplankton production. The hypothesis of this research is that increases in external nutrient loading into Greens Creek will not result in an increase in primary production. The reasons behind this are due to the light limitation of …
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Development of an optical fibre array fluorosensor for monitoring in the aqueous environment.
… system is fully described. The study of marine phytoplankton and its fluorescence properties were also fully investigated before a series of sea trials were conducted. These sea trials involved the deployment of the optical fibre probe/s under various conditions. The system was found to …
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Characteristics of Nitrogen- and Iron-Limited Growth in the Diatom Phaeodactylum tricornutum, and in Natural Phytoplankton Populations.
… pathways involved in nitrogen (N) utilisation by marine phytoplankton have received considerable attention over the last forty years, but our understanding of these processes, and how they are affected by environmental change is still far from complete. This study investigates N metabolism in …
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Microbial production and consumption of marine dissolved organic matter
Marine phytoplankton are the principal producers of oceanic dissolved organic matter (DOM), the organic substrate responsible for secondary production by heterotrophic microbes in the sea. Despite the importance of DOM in marine food webs, details regarding how marine microbes cycle DOM are …
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Microbial production and consumption of marine dissolved organic matter
Marine phytoplankton are the principal producers of oceanic dissolved organic matter (DOM), the organic substrate responsible for secondary production by heterotrophic microbes in the sea. Despite the importance of DOM in marine food webs, details regarding how marine microbes cycle DOM are …
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Nitrogen isotopes in chlorophyll and the origin of Eastern Mediterranean sapropels
… of nitrogen and carbon isotope ratios in marine particulate and sedimentary chlorophyll derivatives; (2) to establish chlorophyll δ15N and δl3C as proxies for the nitrogen and carbon isotopic composition of marine phytoplankton; and (3) to use chlorophyll nitrogen isotopic ratios to …
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Investigation of the heterogeneous ice nucleation potential of sea spray aerosol
… Cultures of Procholorococcus, a highly abundant marine phytoplankton species, were used as a model source of organic sea spray aerosols. Results show that smaller particles generated from the lysed Procholorococcus cultures were organically enriched and effectively activated as ice nucleating …
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