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 39 for “"Nitrogen limitation"”.
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Investigation of the Gracilaria gracilis proteome response to nitrogen limitation
… nutrient limiting conditions. Inorganic nitrogen has been identified as the major nutrient factor limiting growth and production of G. gracilis populations in South Africa. Although the physiological mechanisms implemented by G. gracilis which allow adaption to low nitrogen environments …
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Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense
… of Maine, environmental factors, specifically nitrogen, are likely to be a controlling factor for A. fundyense blooms. Therefore, the ability to ascertain the nutritional status of this species in field assemblages in critical to understanding its bloom dynamics. The aim of this thesis was to …
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Physiological and behavioral diagnostics of nitrogen limitation for the toxic dinoflagellate Alexandrium fundyense
Thesis (Ph. D.)--Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Dept. of Ocean Engineering; and the Woods Hole Oceanographic Institution), February 2001.
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Study of nitrogen limitation and seed nitrogen sources for historical and modern genotypes in soybean
… Linear relationships between seed yield and nitrogen (N) demand are reported in the scientific literature. Main sources of N to the plant are the biological N fixation (BNF) and the soil mineralization processes. On overall, only 50-60% of soybean N demand is met by the BNF process. An …
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The effect of phosphorus and nitrogen limitation on viral infection in microcystis aeruginosa NIES298 using the cyanophage Ma-LMM01
… lake in Japan. The effect of phosphate and nitrogen limitation on phage and host replication was evaluated through modification of <em>M. aeruginosa</em> culture media. Growth of the host cells was monitored by culture light absorbance at 600 nm, while phage (genome) replication was …
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Impact of daytime nitrogen limitation on structure and function of mixed microalgal communities derived from three geographically distinct sources
Increased nitrogen (N) and phosphorus (P) loadings to surface waters lead to algal blooms which cause eutrophication and hypoxia, threatening aquatic ecosystems, human health, and local economies. The adoption of increasingly stringent regulations for effluent N and P loadings, including from …
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The exo-proteomic framework for nitrogen acquisition from proteinaceous organic matter in the model marine heterotroph Ruegeria pomeroyi DSS-3
Nitrogen-rich proteinaceous compounds are a key component of surface and upper mesopelagic particulate organic matter, and their rapid degradation by heterotrophic bacteria is an important process in releasing bioavailable nitrogen when other nitrogen containing substrates are deficient. …
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Data-driven spatial modeling of historic and future land change at global scale
… (e.g. LULCC datasets, model processes e.g. nitrogen cycle, environmental factors such as climate) in estimating historic and future LULCC emissions, and (4) explore statistical techniques to model future LULCC that takes into account the uncertainties in quantifying the spatial and temporal …
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Identification of differentially expressed genes in the commercially important agarophyte, Gracilaria gracilis, following nitrogen deprivation
… of generating foreign currency through export. Nitrogen limitation occurring within Saldahna Bay during the summer to autumn months, however, is considered to be the major factor preventing commercial cultivation of G. gracilis. Algae possess various survival mechanisms that generally involve …
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Functional analysis of MYB112 transcription factor in the model plant Arabidopsis thaliana
… pathway show enhanced expression levels during nitrogen limitation, or elevated sucrose content. In addition to the mentioned conditions, other environmental parameters including salinity or high light stress may trigger anthocyanin accumulation. In contrast to several other MYB TFs affecting …
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Urea and nickel utilization in marine cyanobacteria as evaluated by incubation, proteomic, and uptake techniques
Nitrogen and trace metal biogeochemical effects on phytoplankton productivity were compared through whole water bottle incubations and proteomic evaluation of in situ harvested particulate matter from two distinct oceanographic regions: the Equatorial Pacific Upwelling and the South Pacific Gyre. …
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Urea and nickel utilization in marine cyanobacteria as evaluated by incubation, proteomic, and uptake techniques
Nitrogen and trace metal biogeochemical effects on phytoplankton productivity were compared through whole water bottle incubations and proteomic evaluation of in situ harvested particulate matter from two distinct oceanographic regions: the Equatorial Pacific Upwelling and the South Pacific Gyre. …
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Primary production of particulate protein amino acids : algal protein metabolism and its relationship to the composition of particulate organic matter
… with conversion of inorganic carbon and nitrogen into protein, the effects of NH+4 limitation on free amino acid and protein composition and incorporation of inorganic 14C were studied in the marine chlorophyte, Nannochloris sp. (clone GSB Nanna). Free amino acid metabolism was sensitive …
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Teak: A Novel Computational And Gui Software Pipeline For Reconstructing Biological Networks, Detecting Activated Biological Subnetworks, And Querying Biological Networks.
… delta and lag1 delta mutants under conditions of nitrogen limitation were found using TEAK. Finally, the third module, the Query Structure Enrichment Analysis framework, is a network query module that allows researchers to query their biological hypotheses in the form of Directed Acyclic Graphs …
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Some aspects of the nitrogen nutrition and growth of Gracilaria gracilis grown by suspended cultivation in Saldanha Bay, South Africa
… by upwelling. This study documents the extent of nitrogen starvation during this period and investigates some possible methods of managing this problem. Nitrogen content, C:N ratio and stable isotope abundances of C and N were obtained for material grown for varying lengths of time, material grown …
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Lost in Starvation: How the interplay between physiology and ecology impacts bacterial persistence in a patchy landscape
… are intertwined. The stress response to nutrient limitation appears within three hours, while the encounter time to new particles has been estimated to happen on the scale of days. Therefore, it is unclear how the phenotypic changes undergone by bacteria during starvation affect their ability to …
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Blooms of the toxic dinoflagellate Alexandrium fundyense in the Gulf of Maine : investigations using physical-biological model
… formulations that do not include either nitrogen limitation or mortality overestimate observed cell abundances and are rejected. However, formulations using a wide range of mortality and nitrogen dependence, including the exclusion of one or the other, were able to match observed bloom …
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Studies on the regulation of nitrogen metabolism in clostridium acetobutylicum NCP 262 and clostridium beijerinckii NCIMB 8052
… governing solvent production is required. Nitrogen metabolism has been shown to be important in the regulation of sporulation and solventogenesis, and the enzyme glutamine synthetase, encoded by the gene ginA, is central to this aspect of metabolism. This work represents a continuation of …
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Guanosine 5'-diphosphate 3'-diphosphate (ppGpp), guanosine 5'-diphosphate 3'-monophosphate (ppGp) and antibiotic production in Streptomyces clavuligerus
… Clavulanic acid was produced in carbon- and nitrogenlimited continuous culture and in carbon- and phosphate-limited batch culture. Low levels of intracellular guanosine 5'-diphosphate 3'-diphosphate (ppGpp) were detected at D= 0.02 h' in continuous culture in all media. Low levels of …
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Biological nitrogen fixation in a nitrogen limited tropical lake, Lake Chapala, Mexico.
… my study was to quantify the rate of biological nitrogen fixation in Lake Chapala, Mexico. Lake Chapala is the largest lake in Mexico. It is an ancient, tropical lake which is shaped in an east-west culde-sac with the inflow and outflow at the eastern end. Previous work showed low available …
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