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 13 of 13 for “"marine diatoms"”.
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Barium uptake by marine diatoms.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences; and, (B.S.)--Massachusetts Institute of Technology, Dept. of Biology, 1978.
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Enhancing the production of Omega-3 polyunsaturated fatty acids in marine diatoms
… omega-3 polyunsaturated fatty acids are marine microalgae, which form the base of the aquatic food web. One alternative source of our ever diminishing stocks of fish and fish oil is via the cultivation of these microorganisms. Unfortunately, these microalgae, of which diatoms are the …
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Growth, photophysiology and photosynthesis of two marine diatoms grown under predictable intra-diel light fluctuations
… impact growth and photophysiology of diatoms is poorly understood. To address this, several aspects of photophysiology were measured in the diatoms Thalassiosira pseudonana and Phaeodactylum tricornutum when grown under square-wave (SQ), sinusoidal (SI), and low (LF) and high (HF) …
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The effect of nutrient limitation and oxidative stress on bromoform production from axenic cultures of marine diatoms
Bromoform is mainly produced naturally by marine organisms. The production by microalgae however is not well quantified, and the mechanism by which phytoplankton produce bromoform is not fully elucidated. The production of this compound at the cellular level seems to be linked to oxidative stress …
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Measuring and Comparing Quantum Yield in Two Species of Marine Diatoms Subjected to Constant and Fluctuating Light Conditions
… fluctuations on the photosynthetic efficiency of marine phytoplankton. Two species, <em>Phaeodactylum tricornutum </em>and <em>Chaetoceros gracile </em>were grown in specialized photobioreactors on a 12-hour:12-hour light:dark cycle. The cultures were diluted 50% daily to attain a specific growth …
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Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms
Marine diatoms are abundant photoautotrophic algae that contribute significantly to photosynthetic carbon fixation and export throughout the oceans. Zinc is an important micronutrient in algal metabolism, with scarce dissolved concentrations in the upper euphotic zone reflecting high biological …
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Assessing the potential for zinc limitation of marine primary production: proteomic characterization of the low zinc stress response in marine diatoms
Marine diatoms are abundant photoautotrophic algae that contribute significantly to photosynthetic carbon fixation and export throughout the oceans. Zinc is an important micronutrient in algal metabolism, with scarce dissolved concentrations in the upper euphotic zone reflecting high biological …
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Biologically active molecules from marine microalgae
Diatoms are unicellular photosynthetic microalgae responsible for approximately 40% of marine primary productivity. This algal class has traditionally been regarded as providing the bulk of the food that sustains the marine food chain to top consumers and important fisheries. However, this …
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Transformations of carotenoids in the oceanic water column
… products. Fucoxanthin, the primary carotenoid of marine diatoms, typically constituted 77-100% of the total fucopigments in suspended particulate material. In sediment trap samples this pigment constituted only 4-85% of the total. The remaining 15-96% of the pigments consisted of the fucoxanthin …
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Growth and the energy budget of juveniles of the abalone Haliotis tuberculata (L.)
… and growth of early juvenile abalone. However, marine diatoms such as Skeletonema costatum, Navicula ramosissima and Cylindrotheca closterium were easily ingested and assimilated depending on the size of the animal and conditions of culture. This thesis studied the effect of different diets (mix …
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Patterns of Evolutionary Conservation and Divergence in the Short-Term Hyposalinity Stress Response of a Euryhaline Diatom, Skeletonema marinoi
… survival of species, even within a lineage. Diatoms may constitute one such lineage, as salinity tolerance among extant species is diverse, and the observation of frequent historic habitat transitions between marine and freshwater environments indicates that diatoms successfully mitigated …
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Refining tsunami inundation limits for the 1700 CE Cascadia earthquake: detailed mapping of fine-grained deposits and diatom biostratigraphy at the Salmon River estuary, central Oregon
… Finer-grained sediments (e.g., silt) and marine microfossils can be transported farther inland beyond traces of sand and more accurately represent tsunami inundation limits. To improve estimates of tsunami inundation, we use a high-resolution, multiproxy approach to more precisely map the …
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Physiological and metabolic characteristics of polar diatoms: insights into cold adaptation and potential for biotechnology
… the summer and complete darkness in the winter. Marine diatoms are prevalent in the polar oceans, significantly contributing to primary productivity and ecosystem functioning. They are characterized by having optimal growth at low temperatures (<10°C) and have developed various genetic …