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 158 for “"oligotrophic"”.
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Impact of Chloramination on the Development of Oligotrophic Biofilms
… and community development of laboratory-grown oligotrophic biofilms over a two-month period. Biofilm development and disinfection were realized in Center for Disease Control (CDC) reactor systems with PVC coupons as the substratum and groundwater as the seeding and growth nutrient. To compare …
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Seasonal patterns of colonization by protozoa in an oligotrophic lake
… foam (PF) units were investigated in.an oligotrophic lake, Mountain Lake, Virginia. PF units were placed into the lake's pelagic water to simulate barren habitat islands suitable for colonization by protozoa. The results were interpreted with respect to the MacArthur-Wilson equilibrium …
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Physiological adaptations of microorganisms to high oxygen in two oligotrophic lakes
… planktobacteria in surface waters of alpine oligotrophic Mountain Lake (Giles County, Virginia). Data included viable colony counts, D-[U-¹⁴C]glucose incorporation into extractable lipid of colonies, and respiration-assimilation of D-[U-¹⁴C]glucose by lake water samples. Significant (P<0.05) …
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The importance of dissolved organic nutrients in the biogeochemistry of oligotrophic gyres
… of biological production within two major ocean oligotrophic gyres: the Southern Indian Ocean gyre and the subtropical North Atlantic gyre. <br/>A transect across the Indian ocean at 32°S conducted in March/April 2002 was sampled for dissolved oxygen, inorganic and organic nutrients and …
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Transport of copiotrophic bacteria in oligotrophic coarse soils: a Monte Carlo analysis
… treatment systems placed in coarse-grained, oligotrophic soils such as those typically found in the mountainous regions of the West are designed and installed with the assumption that most pathogenic microorganisms will not pass unaltered through an unsaturated zone located in the soil below …
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The 16S rRNA characterization of a novel "microaerophilic" Pseudomonas sp. from the oligotrophic deep subsurface environment
A gram negative microaerophilic bacterium, designated Pseudomonas sp. strain MR 100, was isolated from a depth of 463 meters at the Savannah River DOE site and identified using 16S rDNA sequencing and DNA-DNA reassociation. Micro aerophiles from the Middendorf formation were isolated by use of a …
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Biological Iron Limitation within Lake Superior's Watershed: Oligotrophic Algal Blooms Along a Land to Lake Gradient
… relieving iron limitation. Concurrent rises in oligotrophic harmful algal blooms frequency could be influenced by recently relieved iron limitations. Lake Superior, while typically considered an environment resistant to harmful algal blooms, has begun to develop them along its southwest shore. …
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Bacterial Diversity of the Atacama Desert, Chile: The Challenges of Characterizing the Community Dynamics of Extreme Oligotrophic Ecosystems
… characterized for their application to extreme oligotrophic communities. Preliminary PCR-DGGE analysis of a west-east elevational transect from the Pacific Ocean near Antofagasta to the western slopes of the central Andes indicated that bacterial communities along this transect belonged to two …
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Copepod contribution in the pelagic food web in the oligotrophic waters of Eastern Mediterrenean Sea: Implications for MSFD Implementation.
Η Μεσόγειος Θάλασσα είναι γνωστή ως ένα από τα πιο ολιγοτροφικά υδάτινα σώματα στον πλανήτη, που χαρακτηρίζεται από εξαιρετικά χαμηλές συγκεντρώσεις θρεπτικών συστατικών, ιδιαίτερα στο ανατολικό της άκρο. Το ζωοπλαγκτόν, ως βασική ομάδα μεταξύ των βιολογικών συστατικών της Οδηγίας-Πλαισίου για τη …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… sediment core from Kitlope Lake, BC. This ultra-oligotrophic, glacially-turbid nursery lake has a large (~872 km^2) pristine catchment and historically high, but currently depressed, sockeye returns. Climate and fisheries data supplemented with local and traditional knowledge (LTEK) indicated …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… sediment core from Kitlope Lake, BC. This ultra-oligotrophic, glacially-turbid nursery lake has a large (~872 km^2) pristine catchment and historically high, but currently depressed, sockeye returns. Climate and fisheries data supplemented with local and traditional knowledge (LTEK) indicated …
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Kinetics and Mechanisms of Low-Concentration - Multisubstrate Utilization by Biofilms (Soluble Microbial Products, Steady-State Secondary, Oligotrophic Bacteria, Biodegradation of Trace Organics, Modeling)
Two major studies employed laboratory-scale completely mixed biofilm reactors and naturally grown oligotrophs. The first study addressed formation of soluble microbial products (SMP) when the organic concentration was low and biofilms were the predominant form of biological activity. The …
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Microbial Ecology of Dry Permafrost from Elephant Head, Antarctica
… microbial community could persist in cold, oligotrophic, dry permafrost soils from Elephant Head, Antarctica. Low amounts of microbial activity were measured in some microcosm samples at 5, 0, and -5C, as assessed using radiorespiration assays with radiolabeled acetate as a carbon source. …
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Bacterioplankton community composition and activity in the Atlantic Ocean
… in the Northern and Southern oligotrophic gyres and in the equatorial region.<br/>There was no statistically significant inter-annual variability in Prochlorococcus or<br/>Synechococcus abundance or integrated biomass in any of the provinces. The<br/>abundance and biomass of …
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Seasonal and spatial patterns in nitrogen cycling and food web interactions in Lake Taupō New Zealand
… and low productivity, commonly referred to as ‘oligotrophic’, are often viewed as relatively pristine and highly aesthetic ecosystems, but may still require management of nutrient inputs and fisheries. The ecosystem processes that determine functions in oligotrophic lakes are often distinct from …
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Vergleichende Untersuchungen über den potentiellen Eintrag von Nährstoffen in den Wasserkörper von Talsperren durch Freisetzung aus dem Sediment
… sampled in regular intervals (Neunzehnhain I - oligotrophic; Muldenberg - oligotrophic, dystrophic; Saidenbach - mesotroph; Quitzdorf - polytrophic). Many chemical and microbial parameters were examined regarding the trophic dependancy and the possibility for including these parameters into a …
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
… and dimethylsulfide (DMS) production in the oligotrophic North Atlantic are investigated using potential enzyme activity and gene expression and abundance data. Vertical mixing and UV radiative stress appear to be the dominant mechanisms behind seasonal variability in DMS production in the …
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Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean
… and dimethylsulfide (DMS) production in the oligotrophic North Atlantic are investigated using potential enzyme activity and gene expression and abundance data. Vertical mixing and UV radiative stress appear to be the dominant mechanisms behind seasonal variability in DMS production in the …
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Bacterial communities in glacier forefields of the Larsemann Hills, East Antarctica : structure, development & adaptation
… temperatures, low water availability and small oligotrophic nutrient pools and represent sites of different bacterial succession in relation to soil parameters. The investigated sites showed microbial succession at an early step of soil formation near the ice tongue in comparison to closely …
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