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 27 for “"Pseudo-nitzschia"”.
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Factors that impact Pseudo-nitzschia spp. occurrence, growth, and toxin production
This work investigates, for the first time, the Pseudo-nitzschia (PN) dynamics in the western English Channel (L4) and the environmental factors impacting on domoic acid (DA) production in these waters. This is combined with laboratory studies examining key environmental factors and the …
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Cloning and characterization of a novel ferritin from the marine diatom Pseudo-nitzschia multiseries
… have been identified in pennate diatoms such as Pseudo-nitzschia, but not in other Stramenopiles (which include centric diatoms, brown algae and some protist plant parasites) or Cryptophyte relatives. Members of this genus readily bloom upon addition of iron to Fe-limited waters, and are known to …
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Gene discovery and expression profilng in the toxin-producing marine diatom, Pseudo-nitzschia multiseries (Hasle) Hasle
… marine environment. One unique marine diatom, Pseudo-nitzschia multiseries (Hasle) Hasle, produces the the neurotoxin domoic acid, which is the cause of amnesic shellfish poisoning. The molecular characterization of this organism has been limited to date. Therefore, the focus of this thesis was …
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Gene discovery and expression profiling in the toxin-producing marine diatom, Pseudo-nitzschia multiseries (Hasle) Hasle
… marine environment. One unique marine diatom, Pseudo-nitzschia multiseries (Hasle) Hasle, produces the neurotoxin domoic acid, which is the cause of amnesic shellfish poisoning. The molecular characterization of this organism has been limited to date. Therefore, the focus of this thesis was to …
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Population genetic structure of a planktonic diatom in the Gulf of naples : <i>Pseudo-nitzschia multistriata</i>
The planktonic diatom <i>Pseudo-nitzschia multistriata</i> appeared in plankton samples taken at the MareChiara station in the Gulf of Naples in 1995 and has appeared ever since in autumn, and since 2004 also in summer. This thesis focuses on population genetic structure of the species using the …
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Factors regulating transitions among life cycle phases in the marine pennate diatom <i>Pseudo-nitzschia multistriata</i>
The marine pennate diatom <i>Pseudo-nitzschia multistriata</i> has a heterothallic life cycle and the two mating types ('+' and '-') need to be in contact to allow sexual reproduction to occur. In this thesis, results 'are presented of an investigation using con focal and time lapse microscopy …
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Pseudo-nitzschia in the Gulf of Maine: investigating bloom dynamics, species introduction, and climate change implications with observations and models
… increase in harmful algal blooms (HABs) includes Pseudo-nitzschia blooms in the Gulf of Maine, where shellfishery closures can cost millions of dollars. Temperatures in the gulf are warming, which can affect the severity of some HABs. Yet Pseudo-nitzschia in the region are understudied. …
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Pseudo-nitzschia in the Gulf of Maine: investigating bloom dynamics, species introduction, and climate change implications with observations and models
… increase in harmful algal blooms (HABs) includes Pseudo-nitzschia blooms in the Gulf of Maine, where shellfishery closures can cost millions of dollars. Temperatures in the gulf are warming, which can affect the severity of some HABs. Yet Pseudo-nitzschia in the region are understudied. …
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Insights Into Particulate Phosphorus Dynamics and toxic Algal Bloom Events From A 13-Year Sediment Trap Study In Santa Barbara Basin (CA)
… blooms (HABs). One such HAB is the diatom genus Pseudo-nitzschia, which can produce the neurotoxin domoic acid (DA) and has been responsible for numerous marine mammal and bird mortalities on the West Coast of the U.S. The goal of this dissertation is to examine particulate P cycling, …
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Nitrogen nutrition of harmful algal blooms in upwelling systems
… dominant under different nutrient conditions. Pseudo-nitzschia spp. were abundant during a period of strong upwelling and high NO3-, peaking during short periods of wind relaxation. During these periods, a switch from high<br/>nitrate uptake [(NO3 -)] to regenerated nitrogen uptake [(NH4 +) and …
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Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior
… a glutamate analog produced by the marine diatom Pseudo-nitzschia spp. Current regulatory limits are designed to prevent acute neurotoxicity in adult humans. However, research shows that low-level exposure during early life can lead to long-term changes in behavior, neural connectivity, and brain …
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Diatom Community Composition Shifts Driven by Coherent Cyclonic Mesoscale Eddies in the California Current System
… I also found elevated relative abundances of <em>Pseudo-nitzschia</em> <em>cf. sp</em>. and <em>Thalassiothrix sp</em>. in the offshore eddy. The younger, nearshore eddy was higher in macronutrients, Fe-limited, and higher in diversity. Top abundances for this eddy include <em>Pseudo-nitzschia …
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Investigating change in toxic algae in Scottish coastal waters
… with signals that non-toxic species of Pseudo-nitzschia and Alexandrium dominated in high salinity summer water temperatures. The growing season of Alexandrium spp. in Loch Creran was shown to be lengthening, and a germination experiment on Lingulodinium polyedra cysts from the same loch …
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Mechanistic studies of iron uptake into, and release from, Ferritins
… ferritin from the bloom-forming pennate diatom Pseudo-nitzschia multiseries is similar to other eukaryotic ferritins that contains a ferroxidase centre but also contains a third site (site C) only previously found in non-heme bacterial ferritins. The mechanism of iron uptake in P. multiseries …
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Impacts of developmental exposures to the harmful algal bloom toxin domoic acid on neural development and behavior
… a glutamate analog produced by the marine diatom Pseudo-nitzschia spp. Current regulatory limits are designed to prevent acute neurotoxicity in adult humans. However, research shows that low-level exposure during early life can lead to long-term changes in behavior, neural connectivity, and brain …
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Assessing the impact of domoic acid exposure on the zebrafish (Danio rerio) brain across life stages
… is a neurotoxin produced by diatoms in genus Pseudo-nitzschia. DA accumulates in seafood and can affect the health of humans and wildlife. DA is a structural analog of glutamate - an excitatory neurotransmitter - that activates ionotropic glutamate receptors leading to excitotoxicity and …
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Improving the predictability of harmful algal blooms around the Shetland Islands
… was found with the potentially toxic Pseudo-nitzschia seriata complex and increasing temperatures in the North Sea, exemplifying the differences between HAB genera around Scotland.
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Eukaryotic Parasites of Toxic and Bloom-forming Diatoms: Molecular insights in their diversity and physiology
… parasites infecting the toxic diatom genus Pseudo-nitzschia have been investigated in the field via DNA metabarcoding, highlighting swift parasitic outbreaks and suggesting a role in the regulation of diatom blooms. The same method resulted in the first molecular identification of a …
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Photodégradation de l'acide domoïque à l'aide de photocatalyseurs à base d'oxyde de titane /cMélanie Losier
… par certaines espèces du genre de diatomées Pseudo-Nitzschia. Présent dans les eaux côtières, il peut constituer une menace pour la santé publique et la vie marine, et peut entraîner de graves pertes économiques pour les industries de récolte de mollusques et de crustacés. Nous présentons ici …
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Scales of variability of phytoplankton composition and biomass in Algoa Bay, South Africa
… In this period pennate diatoms of Pseudo-nitzschia sp. were abundant; this genus has been reported to produce the neurotoxin, domoic acid. Variable environmental conditions with low chlorophyll-a concentrations at Algoa Bay’s marine culture site indicate unsuitable conditions for …
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