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 115 for “"Marine organisms"”.
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How marine organisms cope with changing climate
… the oceans are becoming warmer and more acidic. Organisms need to adjust to such environmental changes and display a variety of mechanisms to maintain their fitness in novel conditions. These adjustments can operate at various levels of biological organisation: from cellular levels to organismal …
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Analyses of Organic Halogen Compounds in Marine Organisms
Made available in DSpace on 2014-12-10T23:24:35Z (GMT). No. of bitstreams: 1 7500468.pdf: 6438115 bytes, checksum: 03979e7270c8aa602e4edcdf27208e59 (MD5) Previous issue date: 1974
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Elucidating Mechanisms of Biofluorescence and Bioluminescence in Marine Organisms
<p>Biofluorescence and bioluminescence are two methods of light emission that entail separate mechanisms of action but end at the same process: a colorful display that have tremendous ecological and behavioral benefits, whether it be used to communicate with conspecifics, camouflage into a …
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Structural colour in marine organisms: From nature to applications
… responsible for the appearance of many living organisms. Over the past few decades, such mechanism has been proposed to develop alternatives to traditional dye-based pigments as it allows for the production of bright and vivid colourations using sustainable materials. Whilst structural colour …
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Isolation And Characterization Of Natural Antimicrobials From Plant And Marine Organisms
… a limited lifespan due to the ability of microrganisms to develop antimicrobial resistance. In this study a number extracts of plant and marine organisms were evaluated for their antimicrobial activity against a number of high priority pathogens. Bioassay-guided fractionation of four extracts …
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Adverse Effects of Crack/Cocaine to Marine Organisms Affected by Acidification Conditions
… alter physiology as well as behavior of aquatic organisms. Since 1970, cumulative carbon dioxide (CO2) emissions from fossil fuel combustion, cement production and flaring have tripled, and cumulative CO2 emissions from forestry and other sources have increased by about 40%. Rising atmospheric …
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Isolation, Characterization, and Molecular Modeling Studies on Diterpenes From Marine Organisms Withing the Eunicea Genus
Mass spectrometry was used in conjunction with numerous 1-D and 2-D NMR techniques to determine the structures, devoid of stereochemistry, of five different compounds isolated from the extracts of Eunicea succinea, Eunicea tourneforti, and an unidentified species isolated from the Eunicea genus by …
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Broadband and statistical characterization of echoes from random scatterers : application to acoustic scattering by marine organisms
… in the context of acoustic scattering by marine organisms. The unifying themes of the thesis are 1) quantitative characterization of the spectral, temporal, and statistical features derived from echoes collected using both broadband and narrowband signals, and 2) the interpretation of …
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Broadband and statistical characterization of echoes from random scatterers : application to acoustic scattering by marine organisms
… in the context of acoustic scattering by marine organisms. The unifying themes of the thesis are 1) quantitative characterization of the spectral, temporal, and statistical features derived from echoes collected using both broadband and narrowband signals, and 2) the interpretation of …
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The toxicity of ammonia to the marine organisms, sheepshead minnow (Cyprinodon variegatus), mysid (Mysidopsis bahia), and grass shrimp (Palaemonetes pugio)
… ammonia has been proposed in Virginia to protect marine aquatic life. This limit was based upon the national chronic criterion for un-ionized ammonia (0.035 mg/L) which was calculated using both freshwater and saltwater toxicity data. Therefore, additional bioassays needed to be performed with …
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Population Variation in the Mitochondrial-DNA of Two Marine Organisms: The Hard Shell Clam <i>Mercenaria spp.</i> and the Killifish, <i>Fundulus Heteroclitus</i>
<p>The two major topics are covered in this dissertation: the integration of molecular genetic tools with applied aquacultural research and short-term evolutionary dynamics. The first study investigated the extent of geographic differentiation of native clam stocks along the U.S. east and Gulf …
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Alpha-radioactive isotopes in the marine environment.
Various marine organisms collected from southern hemisphere waters around Cape Town were analysed by radiochemistry and alpha-spectrometry for Pu-239, 240. Many of these organisms were also analysed for Pu-238, Po-210 and - those isotopes of thorium and uranium that are alpha-emitters. In some …
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Micro fluidic cytometry for analysis of marine microorganisms
… to be strategically important for the study of marine environments in general and of phytoplankton in particular because it enables rapid, simultaneous quantitative analysis of multiple optical properties of particles. Unfortunately, cost, complexity and size limit the widespread use of this …
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A sea of contested evidence: Disputes over coastal pollution in Hout Bay, Cape Town, South Africa
… into the Atlantic Ocean through deep-water marine outfalls in Green Point, Camps Bay and Hout Bay. At total capacity, these three outfalls discharge 55.3 megalitres (Ml) into marine receiving environments daily. With minimal pre-treatment that amounts to screening and sieving, this results …
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South African marine compounds as anticancer agents
… a wide range of extracts from southern African marine organisms, supplied by our collaborators from Rhodes University, South Africa. The marine environment represents a rich, untapped repository of novel and interesting compounds, and through our collaboration we had access to a wide range of …
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Living costs of ocean acidification and warming in herbivorous gastropods and their adaptations
… to cause substantial abiotic changes in future marine ecosystems, including ocean acidification and warming. In addition, extreme climatic events, such as heatwaves, will become more prevalent and persistent due to global warming. Thus, extensive studies have been conducted to determine how …
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The Late Cenomanian Anoxic Event; implications for foraminiferal evolution
… have been integrated with changes in other marine organisms through the late Cenomanian.
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Determination of Toxic Chemical Contents in the Black Sea Marine Water , Sediment and Biota //// Определяне съдържанието на токсични химични елементи в системата вода-седимент- биота
[EN] Heavy metals in marine systems are a global problem, since continuous exposure of marine organisms to their low concentrations may result in bioaccumulation, and subsequent transfer to man through the food web (Mendil et al, 2005). Heavy metals in the marine environment may originate from …
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Fungal Biofilm Colonization and Succession on Artificial Reefs in the North-Central Gulf of Mexico
… biofilm communities on artificial reefs in the marine environment. Previous fungal biofilm studies have failed to observe the naturally-occurring biodiversity in coastal areas, which comprise the most utilized zone of the marine environment. Artificial reefs can increase fishing yields, amplify …
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Coral adaptations across ecological and evolutionary scales
Marine organisms occupy environments spanning wide distributions of conditions across large (e.g., latitudinal gradients) and small (e.g., different depths) scales. Populations that exist across these environments might be adapted to local conditions and exhibit genetic divergence between habitats, …
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