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 38 for “"Marine algae"”.
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Characterization of a Bromoperoxidase From the Marine Algae Penicillus Capitatus
… soluble emzyme bromperoxidase isolated from the marine green algae P. capitatus is capable of catalyzing halide oxiations while in the presence of peroxide. Protein purification and characterization of this enzyme showed that the prosthetic group is ferric protoporphyrin IX and that the enzyme …
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The analysis of marine algae photosynthetic pigments by high performance liquid chromatography
A method of analysis of the photosynthetic pigments of in vitro algal cultures, using reverse-phase high performance liquid chromatography (HPLC) is described. This technique was extended to analysis of photosynthetic pigments in samples from the SIBEX-I Expedition; a preconcentration technique was …
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Organic nitrogen uptake by marine algae: consequences for marine ecosystem functioning and biodiversity
… a major pool of fixed, reactive nitrogen in marine systems. It is now recognized that this pool can support primary production and the ability of some algal species to exploit DON compounds as sources of Nitrogen (N) may indicate that specific DON components can exert selective pressure on …
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Characterisation, bioactivity and qsar studies of natural products from selected Namibian red marine algae
… was to discover new drug leads from Namibian marine algae. Plocamium extracts were screened and their phytochemical contents were quantified. Both the antioxidant activity and the antimicrobial activity of the crude extracts were determined, as well as the dose-response relationship for …
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Extraction of Algal Pigments and Their Encapsulation in Lyotropic Liquid Crystalline Nanoparticles for Anticancer Applications
… source of drugs is a widely available biomass of marine algae, rich in a whole range of valuable bioactive compounds. Modern green extraction techniques, such as microwave-assisted extraction (MAE), allow for highly efficient isolation of natural products with low energy and solvent input, …
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Investigação da atividade psicofarmacológica do extrato etanólico bruto de Sargassum polyceratium em modelos animais utilizando roedores
Marine algae has been the target of important researches in the past 50 years, in which were isolated and characterized a vast number of constituents of great importance to chemists and taxonomists. As scientific information about Sargassum polyceratium is quite limited, this study aims to evaluate …
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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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Determination of biologically active substances in Black Sea algae//Определяне на биологично активни вещества в черноморски водорасли
[EN] Marine organisms, especially marine algae are one of the most complete and natural food sources rich in a number of vital biologically active compounds, including polyunsaturated fatty acids, sterols, proteins, polysaccharides, antioxidants, pigments among others. Various biologically active …
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Methane sulphonic acid as a tracer for non sea salt sulphate: implications for global climate regulation
… product, sulphate, it's only major ource is the marine precursor compound. Given the potential importance of marine sulphur in influencing the albedo of clouds, it has been propo ed that the activity of marine algae has a wider global role in climate regulation (Charlson et al., 1987). …
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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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The effects of elevated CO2 and ocean acidification on the production of marine biogenic trace gases
… a climatically important trace gas produced by marine algae: it transfers sulphur into the atmosphere and is a major influence on biogeochemical climate feedbacks. Halocarbons are also important biogenic trace gases which undergo atmospheric photochemical degradation, releasing halide radicals …
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Variation in chemical components of aquacultured Ulva (Chlorophyta) in response to environmental variables
… biology and chemical composition is included. Marine algae are known to produce a wide range of volatile organic compounds that are primarily used in chemical communications. These compounds are released in seawater and act as either pheromones or allelochemicals. Aldehydes have been reported …
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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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Structural and Synthetic Studies of Bioactive Natural Products
… and comparison to the known literature data. Two marine extracts were also investigated. The pyridoacridine alkaloids, amphimedine and neoampimedine, were isolated from the marine sponge Petrosia sp., and three bromo-tyrosine alkaloids were isolated from the marine sponge Porphyria flintae. The …
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Development of hydrogel tracer beads and comparative tracer tests to better understand contaminant fate and transport in karst systems
… tracer made of calcium alginate (a derivative of marine algae), to better represent the behavior of NAPLs. The density of the HTBs can be readily modified to match different types of NAPLs. Sinking- and buoyant-HTBs were released during a preliminary field test at Hazel Run, in Bruceton Mills, WV. …
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Unravelling the impacts of palaeoecology, palaeoenvironment and lithofacies on sedimentary organic NSO compounds
… biomarkers. The impact of biological sources (marine algae, terrestrial plants and lacustrine Botryococcus braunii) on organooxygen and organonitrogen compounds was revealed through the investigations on the solvent extracts of immature–early mature rock samples from the marine Dynow, Schöneck, …
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