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 “"brown algae"”.
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Evolution of the brown algae Fucus radicans and F. vesiculosus in the Baltic Sea
The aim of my thesis was to investigate neutral and adaptive evolution of a lineage of macroalga (Fucus vesiculosus) that entered the Baltic Sea about 6000 years ago, and later gave rise to a new endemic species, F. radicans. To examine whether the two species have adapted to local conditions of …
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The physiology and biochemistry of the Laminaria Pallida/Carpoblepharis Minima and Ecklonia Maxima/Suhria Vittata associations from South-Western Cape waters, South Africa
The two laminarian brown algae Laminaria pallida Grev. ex. J. Ag. and Eoklonia maxima (Osb.) Papenf. are important both economically and as major components of the South-western Cape waters, South Africa. Growing attached to these brown algae are several different species of red algae two of which, …
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Detached macrophyte accumulations in surf zones: Significance of macrophyte type and volume in supporting secondary production
Detached macrophytes (sea grass and macroalgae) are transported from more offshore areas and accumulate in large volumes in surf zones, where they are commonly called wrack. In coastal regions in other parts of the world, wrack transported from one habitat to a second habitat can be considered as a …
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The role of brown algal cell walls in morphogenesis and development
… evolutionary paths, land plants and some brown algae exhibit great developmental and morphological similarities. In two brown algal model systems: the Sargassum muticum apex and the Fucus serratus embryo, I have used a combination of imaging techniques, growth analyses, surgical and …
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Some South African red seaweed polysaccharides
Algae have been classified by botanists into four large groups: the Chlorophyceae or green algae, the Phaeophyceae or brown algae, the Rhodophyceae or red algae, and the Cyanophyceae or blue-green algae. The polysaccharides which are extracted from marine algae may be differentiated into reserve …
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Patterns of evolution in a young species, the Baltic seaweed Fucus radicans
… This thesis centers on the evolution of the two brown algae Fucus radicans and Fucus vesiculosus in the Baltic Sea, where Fucus radicans very recently diverged from F. vesiculosus, and where both species have aquired the unique character of asexual recruitment forming clones. Speciation is one of …
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SOME CHEMICAL CONSTITUENTS OF THE BROWN ALGA, AGARUM CRIBOSUM AND THE EFFECT OF ELECTROSTATIC INTERACTIONS ON THE STEREOCHEMISTRY OF THE S(N)2' REACTION
<p>Part 1. Some Chemical Constituents of the Brown Alga, Agarum cribosum. Agarum cribosum was examined for major chemical constituents. Halogenated terpenes found in red algae were not present in this seaweed. The sterol content was determined by GC/MS analysis and six sterols were identified: …
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Ichthyoplankton Composition in the Loop Current and Sargassum Habitats in the Northern Gulf of Mexico
… a two species assemblage of floating brown algae that is habitat for many larval and juvenile obligate and associated fishes. The objectives of this study were to characterize the density and community composition of ichthyoplankton within these habitats using multivariate analysis. I …
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Transcriptomics-Guided Biodiscovery of Peroxidases from Macroalgae
… recombinant production. Marine macroalgae, due to their phylogenetic diversity and ecological adaptations, represent a promising and largely untapped source of novel biocatalysts. The aim of this work was the transcriptomics-guided identification and characterization of novel enzymes, …
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Synthesis of glycolipids inspired by Fucus distichus and natural product isolation and characterization of Euphorbia lancifolia
… extracts of Fucus distichus, a freshwater brown algae harvested from Ungava Bay in northern Quebec, have demonstrated antiviral and antibiotic activity. The major component and potential active molecule from this seaweed was identified as a glycolipid consisting of beta- D-galactose linked …
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Assessing the Nursery-Role Function of Pelagic Sargassum for Juvenile Fishes in the Northern Gulf of Mexico
<p><em>Sargassum</em>, a genus of holopelagic brown algae, floats at the ocean’s surface using air-filled bladders and forms a complex comprised of two species, <em>S. natans</em> and<em> S. fluitans</em>. Oceanic processes (e.g., Langmuir circulation, etc.) aggregate <em>Sargassum </em>into mats …
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The phylogeny, biology and biogeography of the Southern African kelps Ecklonia maxima and Laminaria pallida
Brown algae of the order Laminariales, commonly referred to as kelps, are the largest and most productive primary producers in the coastal inshore environment. Three genera of kelps are present on the southern African coast: Ecklonia, Laminaria and Macrocystis, of which the first two are …
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Development of chitosan/alginate/silver nanoparticles hydrogel scaffold for soft tissue engineering applications
… or bioimplants. However, Alg derived from brown algae is highly compliant and easily decomposed in fluid, whilst Chi derived from shrimp shells has weak strength. In rectify these problems, the development of Chi and Alg based biodegradable scaffolds incorporated with silver nanoparticles …
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Tipping points, regime shifts and species interactions within shallow marine ecosystems
… on multiple shores, those dominated by green algae, those dominated by barnacles and those dominated by brown algae. Grazer number and biodiversity was higher on the latter of these boulder states. We then manipulated a green algae dominated system, by either removing 20% of the algae on the …
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Cloning and characterization of a novel ferritin from the marine diatom Pseudo-nitzschia multiseries
… 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 produce the neurotoxin domoic acid. Until now, the reason for the success of …
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Bioinformatics Discovery And Functional Characterization Of Lipid-Binding Lov Photoreceptors
… effectors (“RGS-LOV-PAS”) in dikarya fungi and brown algae. We report the experimental characterization of two bioinformatics-identified fungal RGS-LOV-PAS photoreceptors, BcRGS5 from B cinerea and CeRGS from C. europaea, that rapidly localize from cytoplasm to the plasma membrane upon …
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Herbivory by Parma mccullochi (Pomacentridae) : its role as an ecosystem engineer in temperate algal-dominated reefs
… and their likely importance in removing algae from reefs in the region, there is a lack of information on their diet and their impact on the reef algal community. This study aims to determine the role of Parma mccullochi as an ecosystem engineer on temperate algal-dominated reefs in the …
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Molecular insights into the niche of harmful brown tides
Recurrent brown tide blooms caused by the harmful alga Aureococcus anophagefferens have decimated coastal ecosystems and shellfisheries along the Eastern U.S. and South Africa. The exact mechanisms controlling bloom formation, sustenance, and decline are unclear, however bottom-up factors such as …
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ANTIFUNGAL ACTIVITY OF NATURAL AND NATURAL-INSPIRED BIOACTIVE COMPOUNDS TO CONTROL THE RICE BLAST FUNGUS
… Phlorotannins, polyphenolic compounds from brown algae, were synthesized and evaluated as antifungal agents. Polymethylated diphenyl ether derivatives showed moderate mycelial growth inhibition (20–45%) across multiple fungal strains, indicating that structural features such as methylation …
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Diet of the Tropicalised Herbivore Siganus fuscescens Across a Broad Latitudinal Gradient and Comparisons With Temperate Seagrass-associated Omnivorous Fishes
… Shark Bay and Perth. In all regions, red algae were the primary dietary component. Leathery macrophytes were also consumed in the temperate region, while filamentous Sphacelaria was grazed in subtropical Shark Bay and corticated foliose Dictyota in the tropical Kimberley. Seagrass was …
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