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Dissertations / Theses on the topic 'Microbial activities'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Zhang, Li. "Clay Minerals Supporting Microbial Metabolic Activities in Natural Sediments." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1564142598119446.

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2

Rattray, Julie. "Studies on activities and diversities of heterotrophic bacteria in acidified lochs." Thesis, Glasgow Caledonian University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327893.

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3

Martin, Gregory Dean. "Microbial Community Composition and Activities in Wet Flue Gas Desulfurization Systems." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1493919370366314.

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4

Gibson, Michael John. "Biofiltration of dimethyl disulphide and ammonia, investigation of the underlying microbial activities." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2002. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ65821.pdf.

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5

Stiltner, Bridgett, Emily Garretson, and Phillip R. Scheuerman. "The Use of Microbial Enzyme Activities to Identify Fecal Pollution Sources in Surface Waters." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/2959.

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A total maximum daily load (TMDL), which is the calculated total amount of pollutant that a waterbody can receive from point and non-point sources, is established for streams that do not meet their designated use criteria. Physical, chemical, and biological water quality parameters are used to attempt to identify pollution sources. Microbial enzyme activity (mg/mL) is used to monitor the changes in the microbial community by identifying changes in their metabolism. The health of a stream can be monitored by the presence and absence of microorganisms due to the response of the microbial communi

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6

Marti, Serrano Elisabet. "Occurrence of antibiotic resistance genes in aquatic microbial communities exposed to anthropogenic activities." Doctoral thesis, Universitat de Girona, 2014. http://hdl.handle.net/10803/671847.

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The overuse of antibiotics has led to the selection of resistant strains. This thesis investigated the occurrence of antibiotic resistance genes (ARGs) in aquatic microbial communities influenced by anthropogenic activities. In this study, qPCR assays were designed to quantify the plasmid-mediated quinolone resistance in environmental samples. Then, several ARGs conferring resistance to several groups of antibiotics were quantified in biofilms and sediments from a wastewater treatment plant (WWTP) discharge point and the receiving river. Ciprofloxacin-resistant strains were also isolated an

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7

Odenthal, Paul James. "Push-pull test for in situ determination of microbial metabolic activities : denitrification and methanogenesis /." Thesis, Springfield, Va. : Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA304749.

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8

Salome, Kathleen. "Non-reductive biomineralization of U(VI)-phosphate minerals through the activities of microbial phytases." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52166.

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In environments characterized by low pH and/or high nitrate, the biomineralization of U(VI)-phosphate minerals represents a uniquely suited bioremediation method involving microbially-mediated hydrolysis of organophosphates coupled to a chemical precipitation of sparingly soluble U(VI)-phosphate minerals. In this study, the ability of natural microbial phytases to hydrolyze phytate, a naturally-occurring and abundant organophosphate, and precipitate uranium-phosphate minerals was investigated through a combination of sediment microcosms, soil slurries, and pure culture studies. In this study

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9

Ludwig, Sarah. "Fire severity effects on nutrient dynamics and microbial activities in a Siberian larch forest." Thesis, University of Alaska Fairbanks, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10146125.

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<p> High-latitude ecosystems store large amounts of carbon in soil organic matter and are among the most vulnerable to climate change. In particular, fire severity and frequency are increasing in boreal ecosystems, and these events are likely to have direct and indirect effects on climate feedbacks via increased emission of carbon (C) from soil and changes in vegetation composition, respectively. In this study we created experimental burns of three severities in the northeastern Siberian arctic, near Cherskiy, RU, and quantified dissolved C, nitrogen (N), and phosphorus (P), and microbial resp

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10

Mtimkulu, Yandiswa. "Monitoring extracellular enzyme activities and microbial population numbers during composting of winery solid waste." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2344.

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Thesis (MTech (Horticulture))--Cape Peninsula University of Technology, 2016.<br>Waste management in winery and distillery industries faces numerous disposal challenges as large volumes of both liquid and solid waste by-products are generated yearly during cellar practices. Composting has been suggested a feasible option to beneficiate solid organic waste. This incentivized the quest for efficient composting protocols to be put in place. The objective of this study was to experiment with different composting strategies for spent winery solid waste. Compost materials consisting of chopped pruni

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11

icardi, sara. "Lignocellulose degradation: a proteomic and metagenomic study." Doctoral thesis, Università del Piemonte Orientale, 2018. http://hdl.handle.net/11579/97185.

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Wood decay processes have recently attracted so much attention, as lignocellulose biomass (LCB) represents the most abundant renewable resource on the Earth and can provide fermentable sugar monomers convertible into value-added products. In order to improve the efficiency and ecological sustainability of the process, new insights about lignocellulosic biomass microbial degradation could be of fundamental importance. Organic matter rich environmental samples may host a large variety of microbes, most of them specialized in the degradation of LCB and thus important as potential sources of bioch

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12

McLean, Mary Ann. "Impacts of earthworm invasion on microbial activities and soil communities in a pine forest floor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq20755.pdf.

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13

Penduka, Dambudzo. "In-vitro anti-vibrio activities of crude extracts of Garcinia Kola seeds." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/405.

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The n-Hexane, dichloromethane, methanol and aqueous crude extracts of Garcinia kola (Heckel) seeds were screened for their anti-Vibrio activities against 50 Vibrio bacteria isolated from wastewater final effluents. The 50 isolates consisted of different Vibrio species namely V. fluvialis (14), V. vulnificus (12), V. parahaemolyticus (12), V. metschnikovii (3) and 9 others unidentified to the specie level. The n-Hexane, dichloromethane and methanol extracts had activities against 16 (32 percent) of the Vibrio isolates, while the aqueous extracts had activities against 12 (24 percent) all at a s

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14

Shen, Juecui. "Microbial communities and enzyme activities related to C and N cycling in fertilized and unfertilized forests." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23239.

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The study was conducted at the fertilization demonstration plots of the Salal Cedar Hemlock Integrated Research Program. PH, moisture, N availability (NO₃⁻ and NH₄⁺), microbial biomass C,N and P, phospholipid fatty acids (PLFA), and enzyme activities were measured in the forest floor and mineral soil of western red cedar stands and western hemlock stands ten years following fertilization with N or P, or both. Results showed that forest floor had the largest effect on microbial and soil chemical variables, followed by forest type, and fertilization. N fertilization significantly increased overa

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15

Penton, Christopher Ryan. "Influences of nutrient loading, vegetative habitats and simulated drought on microbial enzyme activities in the everglades." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0005181.

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16

Ouyang, Yang. "Agricultural Nitrogen Management Affects Microbial Communities, Enzyme Activities, and Functional Genes for Nitrification and Nitrogen Mineralization." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/5068.

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The transformations of organic nitrogen to ammonium and nitrate are central processes in the internal soil nitrogen cycle. In most agricultural soils, ammonium is rapidly oxidized to nitrate in the process known as nitrification; often leading to loss of nitrate from the system. Nitrification is mediated by ammonia oxidizing bacteria or archaea, and nitrite oxidizing bacteria. Understanding links between process rates, enzyme activities and the communities of microbes that cycle nitrogen may contribute to sustainable management. Our main objective was to determine the impacts of contrasting ni

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17

Ghosh, Soumya. "Metagenomic screening of cell wall hydrolases, their anti-fungal activities and potential role in wine fermentation." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96977.

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Thesis (PhD)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: The grape and wine ecosystem contains fungi, bacteria and yeasts whose interactions contribute to the final wine product. While the non-Saccharomyces yeasts are dominant in the early stage of alcoholic fermentation, the later stage is always dominated by Saccharomyces cerevisiae. Although their presence in wine fermentation is often short-lived, the non-Saccharomyces yeasts are known to produce an array of extracellular hydrolytic enzymes which facilitate the extraction and release of aroma compounds, but might also play a role

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18

Singh, Gargi. "Effect of surface modifications on biodegradation of nanocellulose and microbial response." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/76655.

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History teaches us that novel materials, such as chlorofluorocarbon and asbestos, can have dire unintended consequences to human and environmental health. The exponential growth of the field of nanotechnology and the products developed along the way provide the opportunity for a new paradigm of design thinking, in which human and environmental impacts are considered early on in product development. In particular, nanocellulose is touted as a promising green nanomaterial, as it is sourced from an effectively inexhaustible feedstock of wood-based cellulose and is assumed to be harmless to the en

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19

Van, Coller Charné. "Utilizing earthworm and microbial assays to assess the environmental effects of different mining activities / Charné van Coller." Thesis, North-West University, 2011. http://hdl.handle.net/10394/9712.

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Mining has negative impacts on the environment, and is one of the main contributors to environmental pollution. This holds a potential hazard for ecosystems surrounding mining areas and also for public health in the surrounding communities. There is therefore a need for ecotoxicological research in order to assess these possible risks and find ways to minimize the harmful effects. One way in which to assess soil vitality are soil enzymes which are produced by plants and microorganisms and will therefore be more abundant in healthy soils. Earthworms have been proven to be useful bioindicators f

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20

Evanshen, Brian G., Kurt J. Maier, and Phillip R. Scheuerman. "Comparison Study of the Averaged Sediment Microbial Enzyme Activities in Four Fecally-Contaminated streams in the Same Watershed in Northeast Tennessee to Biochemical Oxygen Demand, Nitrate Concentration, and Phosphate Concentration." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etsu-works/2944.

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Microbial enzyme activities (MEA’s) are measurements of microbial metabolism. These activities are dependent on the need for nutrients and respiration. This extended study evaluated four streams in the same watershed that had an approved fecal coliform Total Maximum Daily Load. Sediment and water samples were collected monthly for the first year of each specific stream study, and then quarterly to the end of 2006. Dehydrogenase, a measure of microbial respiration, along with acid phosphatase, alkaline phosphatase, galactosidase and glucosidase activities were measured using colorimetric assays

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Evanshen, Brian G., Kurt J. Maier, and Phillip R. Scheuerman. "Comparison Study of Sediment Microbial Enzyme Activities to Biochemical Oxygen Demand, Nitrate Concentration, Phosphate Concentration in the Sediments of a Fecally-Contaminated Stream in Northeast Tennessee Relative to Season and Land Use." Digital Commons @ East Tennessee State University, 2006. https://dc.etsu.edu/etsu-works/2942.

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Microbial metabolism reacts quickly to environmental conditions. These reactions are dependent on the need for nutrients and respiration and can be measured using an assay of individual microbial enzyme activities (MEA’s). In this study, we measured MEA’s in the sediments of a stream in northeast Tennessee that had an approved fecal coliform Total Maximum Daily Load (TMDL). These values were compared to biochemical oxygen demand (BOD), phosphate concentration and nitrate concentration in the water column of this stream. Comparisons were grouped by season and land use. Stream sediments and wate

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22

Mungai, Nancy Wangari. "Distribution of soil organic carbon and nitrogen fractions, enzyme activities and microbial diversity in temperate alley cropping systems /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3137732.

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23

Shikwambana, Sydney. "Microbial population dynamics, enzyme activity and quantification of nutrient release in soil amended with composed with varying degree of maturity." Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1540.

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Thesis (M. Sc. Agriculture (Soil Science)) -- University of Limpopo, 2015<br>The activity and functional diversity of micro-organisms contribute to the stability and productivity of agro-ecosystems. Soil micro-organisms and enzyme activities have been suggested as potential indicators of soil quality. Hence, management practices that can enhance microbial diversity and enzyme activities are essential for improving soil health and soil fertility status. The aim of the study was to assess the effects of compost maturity age on the change in bio-quality indicators of compost and compost amended s

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24

Evanshen, Brian G., Kurt J. Maier, and Phillip R. Scheuerman. "A Comparison Study of Microbial Enzyme Activities and Coliforms in the Sediments of a Fecally-Contaminated Tennessee Stream Relative to Season and Land Use." Digital Commons @ East Tennessee State University, 2005. https://dc.etsu.edu/etsu-works/2941.

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Enzymes react quickly to environmental stress and can serve as sensitive indicators of environmental change. Microbial enzyme activities (MEA’s) can be a useful tool to evaluate the health of an aquatic ecosystem. In this study we compared the trends of MEA’s (µg/g) to total and fecal coliform concentrations (CFU/g) in sediments from a stream in Northeast Tennessee that had an approved fecal coliform Total Maximum Daily Load (TMDL). The comparisons were based on season and land use through which the stream flowed. Triplicate grab samples of stream sediments were collected monthly for 29 months

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25

Rivas, Lamelo Sara. "Processus microbiens de formation des gisements sédimentaires de phosphates actuels." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066110/document.

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L’objectif de ce travail de thèse a été d’étudier l’impact des activités microbiennes sur la spéciation et les flux de phosphore au sein de la colonne d’eau du lac Pavin. Ce lac ferrugineux et méromictique (stratifié de façon permanente) constitue un modèle d’étude des processus de phosphatogenèse, la transition oxique-anoxique délimitant une zone de précipitation de phases minérales phosphatées. Alors que l’on pensait que cette précipitation résultait de processus abiotiques, la contribution des communautés microbiennes a été récemment évoquée mais son ampleur restait à déterminer.Les travaux

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26

Bayer, Anne Isabel [Verfasser], Rainer [Akademischer Betreuer] Meckenstock, and Arnulf [Akademischer Betreuer] Melzer. "Spatial and temporal dynamics of microbial activities in a tar oil contaminated aquifer / Anne Bayer. Gutachter: Arnulf Melzer. Betreuer: Rainer Meckenstock." München : Universitätsbibliothek der TU München, 2012. http://d-nb.info/1019589353/34.

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27

Butler, Vanessa Leanne. "The effects of genetics, age and rearing environment on AvBD gene expression and gut anti-microbial activities in three chicken lines." Thesis, University of Newcastle upon Tyne, 2010. http://hdl.handle.net/10443/2240.

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The defensins have been shown to be an important component of the innate immune system across many species from plants to man. To date a total of 14 beta defensins have been identified within the chicken genome and anti-microbial activity of an array of these peptides against pathogens has been demonstrated. The innate immune system has been shown to be important in chickens during the first week of life when exposure to pathogens in the environment occurs and the adaptive immune system is not fully developed. The research presented in this thesis attempts to investigate the effects of bird ag

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Rivas, Lamelo Sara. "Processus microbiens de formation des gisements sédimentaires de phosphates actuels." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066110.

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L’objectif de ce travail de thèse a été d’étudier l’impact des activités microbiennes sur la spéciation et les flux de phosphore au sein de la colonne d’eau du lac Pavin. Ce lac ferrugineux et méromictique (stratifié de façon permanente) constitue un modèle d’étude des processus de phosphatogenèse, la transition oxique-anoxique délimitant une zone de précipitation de phases minérales phosphatées. Alors que l’on pensait que cette précipitation résultait de processus abiotiques, la contribution des communautés microbiennes a été récemment évoquée mais son ampleur restait à déterminer.Les travaux

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29

Gerull, Linda [Verfasser], and Michael PD [Akademischer Betreuer] Mutz. "Dynamics of microbial metabolic activities during stream ecosystem succession : insights from field observations and flume experiments / Linda Gerull. Betreuer: Michael PD Mutz." Cottbus : Universitätsbibliothek der BTU Cottbus, 2012. http://d-nb.info/1019707313/34.

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30

Piton, Gabin. "Résilience des écosystèmes prairiaux aux stress climatiques selon l'intensité de gestion. Une approche par le concept de trait fonctionnel microbien Using proxies of microbial community‐weighted means traits to explain the cascading effect of management intensity, soil and plant traits on ecosystem resilience in mountain grasslands The resilience of soil microbial communities to climate change-induced rain regimes differs between conventional and ecological-intensive managed soils across European agroecosystems Implementing ecoenzymes in the trait framework bring new insights on the microbial communitiy composition control on ecosystem functioning." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAV070.

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Dans le contexte actuel du changement climatique et de l’augmentation de la fréquence et de l’intensité des épisodes climatiques extrêmes, une question centrale pour l’écologie scientifique est de comprendre les répercussions de ces changements sur le fonctionnement des écosystèmes. Les communautés microbiennes du sol contrôlent une grande partie des processus écosystémiques déterminant la circulation de l’énergie et des nutriments. Dans le cadre des agroécosystèmes se pose donc la question de l’influence des pratiques agricoles sur les communautés microbiennes du sol et sur leur aptitude à ma

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31

Charlton, Alex. "Long-term impacts of zinc and copper on microbial biomass, phosphatase enzyme activities, and the mineralisation of organic phosphorus in sludge amended soils." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/12259.

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The agricultural demand for inorganic phosphate fertilisers needs to be reduced whilst the dependence on more sustainable sources of phosphorus, such as sewage sludge, is increased. However, the presence of heavy metals in sewage sludge pose a threat to soil microorganisms and can inhibit the action of phosphatase enzymes if present in high concentrations. The long-term impact of Zn and Cu on soil microorganisms and phosphatase enzyme activity was investigated at four field sites from the Defra ‘Long-Term Sludge Experiment’ in order to determine the overall impact on organic phosphorus mineral

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Zamora-Ledezma, Ezequiel. "Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20176/document.

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Il est de plus en plus admis que pour comprendre le fonctionnement des écosystèmes, une approche aérienne associée à une approche souterraine est nécessaire en raison des rétroactions entre plantes et sol. La structure des communautés végétales peut affecter le fonctionnement du sol en altérant la quantité et la qualité des ressources intégrant le sol. Les contrôles abiotiques des processus microbiens du sol sont largement documentés, mais les potentiels effets de la composition de la communauté végétale et des traits racinaires sont peu connus. L'étude a été menée sur des prairies méditerrané

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33

Cattaneo, Francesca <1983&gt. "Land use change to perennial energy crops in Northern Italy: Effects on soil organic carbon sequestration and distribution, soil enzyme activities and microbial communities." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6640/1/Cattaneo_Francesca_tesi.pdf.

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Studies on soil organic carbon (SOC) sequestration in perennial energy crops are available for North-Central Europe, while there is insufficient information for Southern Europe. This research was conducted in the Po Valley, a Mediterranean-temperate zone characterised by low SOC levels, due to intensive management. The aim was to assess the factors influencing SOC sequestration and its distribution through depth and within soil fractions, after a 9-year old conversion from two annual systems to Miscanthus (Miscanthus × giganteus) and giant reed (Arundo donax). The 13C natural abundance was

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Cattaneo, Francesca <1983&gt. "Land use change to perennial energy crops in Northern Italy: Effects on soil organic carbon sequestration and distribution, soil enzyme activities and microbial communities." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6640/.

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Studies on soil organic carbon (SOC) sequestration in perennial energy crops are available for North-Central Europe, while there is insufficient information for Southern Europe. This research was conducted in the Po Valley, a Mediterranean-temperate zone characterised by low SOC levels, due to intensive management. The aim was to assess the factors influencing SOC sequestration and its distribution through depth and within soil fractions, after a 9-year old conversion from two annual systems to Miscanthus (Miscanthus × giganteus) and giant reed (Arundo donax). The 13C natural abundance was

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35

Adeyemi, Oluwatosin Oluwakemi. "Comparative in-vitro activities of trimethoprimsulfamethoxazole and the new fluoroquinolones against confirmed extended spectrum beta-lactamase producing Stenotrophomonas maltophilia in Nkonkobe Municipality, Eastern Cape environment." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1007576.

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Stenotrophomonas maltophilia is increasingly emerging as an opportunistic pathogen of global concern. Due to its inherent resistance to several classes of antibiotics including carbapenems and its ability to acquire mobile resistance elements, treatment of infections caused by S. maltophilia is a constant challenge for clinicians. Trimethoprim-sulphamethoxazole (TMP-SMX) is the generally accepted antibiotic of choice for the treatment of infections caused by this organism, but resistance to the drug is increasingly being reported; hence, the need for alternative therapeutic options. In this st

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Borsali, Amine Habib. "Contribution à l’évaluation de l’impact des incendies sur les écosystèmes forestiers : cas de la Forêt de Fénouane , Commune d’Ain El Hadjer, Wilaya de Saida ( Algérie)." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4362.

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L’objectif de cette recherche était d’évaluer les dynamiques de retour à court et à long terme des propriétés physico-chimiques et microbiologiques des sols incendiés et d’étudier le devenir des communautés végétales brûlées. Pour l’étude du sol nous avons analysé les propriétés physiques, chimiques et microbiologiques de 25 échantillons de sol prélevés dans la Forêt de Fénouane (Wilaya de Saida, Algérie) le long d’une chonoséquence de 2, 4, 8, 13 et 20 ans après le dernier feu. Cette étude a permis de montrer la vulnérabilité des sols forestiers de l’étage semi-aride de l’Atlas tellien aux fr

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Junca, Howard [Verfasser], and Dietmar [Akademischer Betreuer] Pieper. "Characterization of the Genetic Potential, Catabolic Structure and Degradative Activities against BTEX in Microbial Communities from Aquifers under Adaptation to Organic Contaminants / Howard Junca ; Betreuer: Dietmar Pieper." Braunschweig : Technische Universität Braunschweig, 2004. http://d-nb.info/1175831115/34.

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Boukhdoud, Nathalie. "Réponses des communautés microbiennes associées à l'olivier à des pratiques agricoles conventionnelles et de conservation : influence des variantes climatiques de la France et du Liban et selon la distance à la mer." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4316.

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Les sols des oliveraies subissent des pressions environnementales fortes telles que les contraintes pédoclimatiques méditerranéennes et des pratiques agronomiques intensives. Ils requièrent une grande attention face aux changements climatiques. En zone littorale, les stress osmotiques et thermiques s’intensifient. Dans un contexte d’exacerbations de pressions, les sols pourraient subir des modifications profondes de leur qualité, modifications qu’il serait possible d’atténuer en adoptant des pratiques agricoles "durables". Ce projet de thèse a pour objectif d’examiner, en tenant compte de la l

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Silva, Alessandra Vaso Rodrigues da. "Prospecção das interações mastoparano-membrana em proteolipossomos como modelo para o desenvolvimento racional de novos agentes antimicrobianos /." Rio Claro : [s.n.], 2009. http://hdl.handle.net/11449/87736.

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Resumo: Neste trabalho estudou-se a estrutura, função e mecanismo de ação do peptídeo antibacteriano Protonectarina-MP (isolado de veneno da vespa social Protonectarina sylveirae) tendo seu resíduo C-terminal nas formas ácida (-OH) e amidada (-NH2). Os peptídeos foram sintetizados, utilizando-se a estratégia Fmoc, purificados por cromatografia líquida de alta performance. O monitoramento do material sintético foi feito por espectrometria de massas ESI-MS e por seqüenciamento através de Química Degradativa de Edman. A estrutura secundária foi investigada pelo uso de espectroscopia de dicroísmo

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Boutrif, Mehdi. "Dégradation de la matière organique dissoute de haut poids moléculaire par les communautés procaryotiques des zones méso- et bathypélagique." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4040.

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Ce travail a pour objectif principal l'étude des interactions entre les compartiments procaryotiques des zones méso- et bathypélagique avec les différentes fractions du carbone organique dissout (DOC) océanique. Des mesures d'assimilation de monomères (3H-Glucose), de dégradation de molécules complexes (3H-EPS et HMW-DOC), et de production hétérotrophe procaryotique (PHP/3H-Leucine) ont été réalisées le long de la colonne d'eau en Mer Méditerranée Nord Occidentale (Golfe du Lion, sites DYFAMED, ANTARES) et en Océan Atlantique Nord-Est (site PAP). Au cours des ces études, toutes les mesures réa

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Andriamalala, Aurore. "Antibiotiques apportés seuls ou en mélange (antibiotique+antibiotique et antibiotique+métaux) dans des sols agricoles – Devenir et impacts sur les microorganismes du sol et leurs activités." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLA022/document.

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Les antibiotiques (ATB) consommés en médecine humaine et vétérinaire sont en grande partie excrétés et peuvent entrer dans les sols agricoles via l’épandage des produits résiduaires organiques (PRO), avec des risques encore mal connus sur la santé humaine et l’environnement. De plus, ces ATB sont le plus souvent apportés en mélange avec d'autres contaminants organiques et/ou minéraux. Or très peu d’études ont abordé le devenir et les effets des ATB en interaction avec d'autres contaminants dans les sols.L’objectif de la thèse était donc de mieux comprendre le devenir des ATB, apportés seuls, o

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Tischer, Alexander. "Ecological gradients caused by land-use change and land management alter soil microbial biomass and community functioning in a tropical mountain rainforest region of southern Ecuador." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-190211.

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Global change phenomena, such as forest disturbance and land-use change significantly affect elemental balances as well as the structure and function of terrestrial ecosystems. Inappropriate land management often causes nutrient losses and finally soil degradation and loss of soil functioning. Especially in tropical ecoregions, soil degradation by nutrient losses is widely abundant. Soil microorganisms are the proximate agents of many processes performed in soils and are regarded as sensitive bio-indicators. However, the incorporation of microbial responses to the definition of critical soil c

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Pailler, Alexia. "Les relations sol/plantes en forêts méditerranéennes : approche bioclimatique des déterminants de la structuration fonctionnelle des communautés microbiennes des sols et de leurs réponses à un double stress hydrique et thermique en région provençale calcaire." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4344/document.

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En contexte forestier méditerranéen au sein de la région provençale calcaire (sud de la France), les relations sol/structure fonctionnelle catabolique des communautés microbiennes/communautés végétales ont été abordées selon différentes échelles bioclimatiques : un gradient latitudinal et altitudinal, et une échelle écosystémique restreinte à différentes séries de chênes pubescents. Ces travaux ont permis d’estimer les contributions respectives (et de leurs interactions) de la structure et de la composition de la végétation et des variables abiotiques dans la détermination des propriétés fonct

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Silva, Alessandra Vaso Rodrigues da [UNESP]. "Prospecção das interações mastoparano-membrana em proteolipossomos como modelo para o desenvolvimento racional de novos agentes antimicrobianos." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/87736.

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Made available in DSpace on 2014-06-11T19:22:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-06-08Bitstream added on 2014-06-13T20:29:34Z : No. of bitstreams: 1 silva_avr_me_rcla.pdf: 1706887 bytes, checksum: eda68ea29b93397b581e427121535611 (MD5)<br>Neste trabalho estudou-se a estrutura, função e mecanismo de ação do peptídeo antibacteriano Protonectarina-MP (isolado de veneno da vespa social Protonectarina sylveirae) tendo seu resíduo C-terminal nas formas ácida (-OH) e amidada (-NH2). Os peptídeos foram sintetizados, utilizando-se a estratégia Fmoc, purificados por cromatografia

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McClure, Clara. "Long-Term Recovery of South Indian Creek Following Interstate Construction." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etd/2296.

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The expansion of Interstate 26 from Erwin, TN to the North Carolina border was a project that potentially adversely impacted South Indian Creek because of the steep landscapes and potential for erosion. Several studies have shown the short-term, negative effects of road construction on the water quality of nearby water bodies. Non-point source pollution is the major source of water pollution in the United States. The primary objective of this research is to evaluate the long-term effects of the construction of Interstate 26 on South Indian Creek to see if there has been any ecological recovery

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Adrover, Fiol Maria. "Efectes del reg amb aigües residuals tractades en els sols i els cultius." Doctoral thesis, Universitat de les Illes Balears, 2010. http://hdl.handle.net/10803/9377.

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El reg amb aigües residuals tractades s'ha convertit avui en dia en una necessitat, ja que permet preservar els recursos hídrics de més qualitat i constitueix una alternativa necessària per al manteniment de regadius tradicionals. En aquesta tesi s'avaluen els efectes del reg amb aigües residuals tractades d'origen domèstic sobre les característiques químiques i biològiques de diferents tipologies de sòls a l'illa de Mallorca, així com sobre el creixement dels cultius i la seva composició mineral mitjançant diferents estudis de camp i en cultius en contenidors. En general no s'han apreciat efe

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Puissant, Jérémy. "Effets des changements climatiques sur la dynamique de décomposition microbienne du carbone organique du sol en prairie subalpine calcaire." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAS008/document.

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Les sols de montagne constituent un réservoir majeur de carbone stocké sous forme de matière organique (carbone organique du sol, COS), potentiellement hautement vulnérable aux changements des conditions climatiques. Afin de comprendre les répercussions des changements des conditions climatiques sur la dynamique du COS des sols de montagne, cette thèse s'appuie sur une expérimentation de transplantation altitudinale de monolithes de sol de prairie subalpine calcaire, mise en place dans le Jura Suisse en 2009. Cette expérimentation permet de simuler deux scénarios réalistes de changements clima

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Bertini, Simone Cristina Braga. "Indicadores microbiológicos de qualidade do solo em Florestas de Araucária no Estado de São Paulo." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-18032011-084540/.

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A Araucaria angustifolia, conhecida como Pinheiro-do-Paraná é uma espécie ameaçada de extinção no Brasil, está inserida num bioma rico em biodiversidade, a Mata Atlântica, e muito pouco se conhece sobre os atributos microbiológicos dessas florestas. Este trabalho teve como objetivo avaliar potenciais atributos microbiológicos do solo e algumas variáveis ambientais (atributos químicos, físicos e efeito sazonal), a fim de estabelecer bioindicadores de qualidade do solo em Florestas de Araucária. Os estudos foram conduzidos em dois parques estaduais localizados em diferentes regiões do Estado de

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Cellier, Antoine. "Amendement d'un compost de boues de station d'épuration dans un écosystème méditerranéen après incendie : effets sur le sol, les micro-organismes et la végétation." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4729/document.

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En région méditerranéen, les incendies de forêt sont un problème majeur vis-à-vis de la désertification du milieu. L'utilisation de composts est considérée comme une solution pour la régénération du sol et de la végétation.Tout d'abord, en laboratoire, les effets de trois types de compost et de leur mode d'application ont été testés : un compost de déchets verts (DV), un compost de boues de station d'épuration (B) et un compost d'ordures ménagères résiduelles (OMR). Les différents paramètres du sol ont été améliorés de façon plus importante par le compost OMR (le moins mature) alors que le com

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Ruiz, Marelis Margarita. "Análise da biodiversidade microbiana em ambiente aquático com despejo contínuo de efluentes de hidrocarbonetos." Universidade Federal do Amazonas, 2014. http://tede.ufam.edu.br/handle/tede/4304.

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Submitted by Geyciane Santos (geyciane_thamires@hotmail.com) on 2015-07-09T14:19:32Z No. of bitstreams: 1 Tese - Marelis Margarita Ruiz.pdf: 48193021 bytes, checksum: 4e7e0fa3715216dbc1c8be5df2d8a197 (MD5)<br>Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-09T14:27:06Z (GMT) No. of bitstreams: 1 Tese - Marelis Margarita Ruiz.pdf: 48193021 bytes, checksum: 4e7e0fa3715216dbc1c8be5df2d8a197 (MD5)<br>Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-09T14:30:24Z (GMT) No. of

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