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 298 for “"heterotrophic"”.
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The role of heterotrophic microflagellates in plankton communities
… one order of magnitude. Microscopical counts of heterotrophic nanoplankton (presumably microflagellates) typically ranged from a few hundred to a few thousand m1-1 for a variety of planktonic environments. They constituted approximately 1/3 to 1/2 of the nanoplankton in the euphotic zone and …
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The ecology and feeding biology of thecate heterotrophic dinoflagellates
A group of thecate heterotrophic dinoflagellates (THDs), principally in the diverse and ubiquitous genus Protoperidinium, was investigated both from an ecological and an organismal perspective. When this study was initiated, nothing was known about their feeding mechanisms, rates or food …
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Synthetic Biology for Autotrophic and Heterotrophic Production of Ethanol
<p>Growing energy demand and rising levels of greenhouse gases has put massive strain on the global environment. Alternatives to fossil fuels are being developed in an attempt to curb climate change. Biotechnology has made large strides in order to create a completely renewable energy source by …
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Interactions between selected metal compounds and marine heterotrophic bacteria
A method was developed to test the toxicity of several metal compounds to selected bacteria. The technique was based on the agar diffusion method. Reliability and reproducibility were enhanced by careful standardisation of experimental parameters. By quantification of the concentration of metal …
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Linking Heterotrophic Metabolism and Nutrient Uptake in Headwater Streams
… these relationships in the predominantly heterotrophic conditions of a southern Appalachian stream. We measured litter input, organic matter standing crops, litter respiration rates and nitrate demand several times during the course of decomposition. There was a strong relationship between …
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The effects of algal density on growth of heterotrophic microflagellates
The major role of heterotrophic nanoilagellates in the ocean is generally thought to be as grazers of bacteria, but they may also play an important role as grazers of photoautotrphs. The goal of the present study was to understand the basic growth kinetics of nanoilagellates feeding herbivorously. …
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Heterotrophic production of the microalgae Cyclotella cryptica: feed for aquaculture.
… by culture and environmental conditions. Heterotrophic cultivation systems are a potential alternative to the more traditional photoautotrophic cultivation systems, which typically suffer from low biomass concentrations, high production costs and unexplained ‘crashes’. This thesis presents …
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Response of indigenous heterotrophic groundwater bacteria to low organic substrate availability
… time saved, and ease of microscopic viewing. Heterotrophic uptake of aspartate, succinate, glucose and fructose by indigenous bacteria was measured and calculations of maximum uptake velocity (V<sub>max</sub>) and a constant (K<sub>t</sub> + S<sub>n</sub>) equalling the natural substrate …
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Siderophore production by heterotrophic bacterial isolates from the Costa Rica Upwelling Dome
An increased understanding of heterotrophic bacterial strategies for acquiring nutrients and trace elements is critical for elucidating their impact on biogeochemical cycling in the ocean. It is estimated that iron is a limiting nutrient for phytoplankton growth in over 30% of the open ocean, but …
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Siderophore production by heterotrophic bacterial isolates from the Costa Rica upwelling dome
(cont) An increased understanding of heterotrophic bacterial strategies for acquiring nutrients and trace elements is critical for elucidating their impact on biogeochemical cycling in the ocean. It is estimated that iron is a limiting nutrient for phytoplankton growth in over 30% of the open …
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Physiological and Phylogenetic Studies of the Biogeography of Alkaliphilic Heterotrophic Bacteria from Serpentinizing Habitats
Serpentinization occurs when ultramafic rocks containing the mineral olivine react with water to produce highly reducing conditions, which are commonly coincident with high concentrations of hydrogen. Hydrogen provides an energy source for microbial metabolism and in combination with mineral …
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Comparison of Heterotrophic Activity in Forested Streams Originating from Wetland and Agricultural Tile Drainage Sources
… inputs on stream ecosystem function, I compared heterotrophic activity (i.e., organic matter breakdown and benthic respiration) in forested streams originating from wetland and agricultural tile drainage sources over four seasons. I found a reduction in heterotrophic activity in the tile-sourced …
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Mechanisms and ecological implications of resistance to predation by heterotrophic ciliates expressed by marine bacteria
… and predation by bacterivorous bacteria and heterotrophic protists. The environmental persistence of marine bacteria can be attributed to multiple intra- and inter-specific strategies such as biofilm formation on biotic and abiotic surfaces, as well as interactions with other organisms, e.g. …
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Recovery of rare earth elements (REE) from waste printed circuit boards (WPCBs) through heterotrophic bioleaching
… strains (e.g. Aspergillus niger) in the heterotrophic bioleaching of REE from WPCBs. Adjusting initial pH (7.5), providing low phosphate concentrations (0.1 mM), and excluding the use of a buffering agent in the bioleaching medium were identified as the most effective factors for …
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Batch test for measurement of ordinary heterotrophic organism active biomass in activated sludge mixed liquor
To aid the design and operation of the single sludge activated sludge system, over the past three decades a suite of steady state design models (e.g. WRC, 1984; Wentzel et al., 1990; Maurer and Gujer, 1994) and kinetic simulation models (e.g. Dold et al., 1980, 1991; Van Haandel et al., 1981; Henze …
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Elucidating Factors that Impact the Removal of Organic Microconstituents by Ammonia Oxidizing and Heterotrophic Bacteria
… oxidizing bacteria (AOB), laboratory enriched heterotrophic cultures free of active nitrifiers with low (Ox⁻) or high (Ox⁺) oxygenase activity, and a nitrifying activated sludge (NAS) from a full-scale wastewater treatment plant) to determine whether partitioning dictates removal of individual …
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An evaluation of the radiorespirometric technique as a method for detecting changes in heterotrophic activity
… technique, a modification of the heterotrophic activity assay, was evaluated as a monitor of toxic perturbation. The basis for the technique consists of trapping ¹⁴CO₂ evolved from the catabolism of a ¹⁴C-labeled substrate, and analyzing the resultant activity in a scintillation …
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