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Dissertations / Theses on the topic 'Model species'

Author: Grafiati
Published: 4 June 2021
Last updated: 27 July 2025

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1

Rasheed, Shaker M. "A reaction-diffusion model for inter-species competition and intra-species cooperation." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13545/.

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This thesis deals with a two component reaction-diffusion system (RDS) for competing and cooperating species. We have analyse in detail the stability and bifurcation structure of equilibrium solutions of this system, a natural extension of the Lotka-Volterra system. We find seven topologically different regions separated by bifurcation boundaries depending on the number and stability of equilibrium solutions, with four regions in which the solutions are similar to those in the Lotka-Volterra system. We study RDS in the small parameter of the range $0< \lambda \ll 1 $ (fast diffusion and slow r
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2

Glue, Joshua Barnaby. "Engineering Allium White Rot Disease Resistance in Allium Species and Tobacco Model Species." Thesis, University of Canterbury. School of Biological Sciences, 2009. http://hdl.handle.net/10092/3513.

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Allium white rot (AWR) is a soilborne disease that seriously damages commercial cultivation of onion (Allium cepa) and garlic (Allium sativum) crops. The disease has been found everywhere onions are cultivated and at present no system of control has been found that fully prevents the occurrence of the disease. The fungus responsible for the disease, Sclerotium cepivorum, uses oxalic acid to kill Allium bulb and root tissue in growing onion and garlic plants. Research suggests recombinant oxalate oxidase and oxalate decarboxylase enzymes may be able to degrade this acid and confer resistance ag
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3

Borrvall, Charlotte. "Biodiversity and Species Extinctions in Model Food Webs." Doctoral thesis, Linköping : Department of Physics, Chemistry and Biology, Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6660.

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4

Dinh, Thi Vinh Ha. "Development and characterization of the Brachypodium species polyploid model." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLE024.

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La polyploïdie consiste en la duplication du génome entier et constitue une force évolutive majeure chez les eucaryotes, notamment chez les angiospermes. Les espèces du genre Brachypodium ont émergé comme une modèle intéressant des monocotylédones. Parmi ces espèces, l’allopolyploïde B. hybridum (2n = 30) a résulté de l’hybridation entre B. distachyon (2n = 10) et B. stacei (2n = 20). Les deux espèces parentales ont eu des évolutions chromosomiques assez divergentes aboutissant à ce que B. distachyon possède deux fois moins de chromosomes qui sont néanmoins deux fois plus grands que ceux de B.
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5

Kon, Kam King Guillaume. "Revisiting Species Sensitivity Distribution : modelling species variability for the protection of communities." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10194/document.

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La SSD (Species Sensitivity Distribution) est une méthode utilisée par les scientifiques et les régulateurs de tous les pays pour fixer la concentration sans danger de divers contaminants sources de stress pour l'environnement. Bien que fort répandue, cette approche souffre de diverses faiblesses sur le plan méthodologique, notamment parce qu'elle repose sur une utilisation partielle des données expérimentales. Cette thèse revisite la SSD actuelle en tentant de pallier ce défaut. Dans une première partie, nous présentons une méthodologie pour la prise en compte des données censurées dans la SS
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6

Venne, Simon. "Can Species Distribution Models Predict Colonizations and Extinctions?" Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38465.

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Aim MaxEnt, a very popular species distribution modelling technique, has been used extensively to relate species’ geographic distributions to environmental variables and to predict changes in species’ distributions in response to environmental change. Here, we test its predictive ability through time (rather than through space, as is commonly done) by modeling colonizations and extinctions. Location Continental U.S. and southern Canada. Time period 1979-2009 Major taxa studied Twenty-one species of passerine birds. Methods We used MaxEnt to relate species’ geographic distribu
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7

Ziv, Yaron David 1960. "Effects of environmental heterogeneity on species diversity: A new process-based, multi-species, landscape simulation model (SHALOM)." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282584.

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I designed and implemented a process-based, multi-species, spatially-explicit, object-oriented landscape simulation model that analyzes how high-level ecological complexity affects species diversity patterns (SHALOM). SHALOM has physical (landscape, habitat, cell, patch) and biological classes (population, species, community). At the local scale, populations grow continuously, affected by a community-level saturation effect, a species-habitat match, and demographic stochasticity. The global-scale processes are dispersal and catastrophic stochasticity. The model uses allometric relationships an
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8

Alizadeh, Shabani Afshin, and afshin alizadeh@rmit edu au. "Identifying bird species as biodiversity indicators for terrestrial ecosystem management." RMIT University. Mathematical and Geospatial Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061116.161912.

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It is widely known that the world is losing biodiversity and primarily it is thought to be caused by anthropogenic activities. Many of these activities have been identified. However, we still lack a clear understanding of the causal relationships between human activities and the pressures they place on the environment and biodiversity. We need to know how ecosystems and individual species respond to changes in human activities and therefore how best to moderate our actions and reduce the rate of loss of biodiversity. One of the ways to detect these changes is to use indicators of e
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9

Patchedjiev, Stefan M. "Kinetic lattice gas model of two species in one dimension." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24891.pdf.

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10

Jones, Martin Robert. "Deep metabolome annotation of the freshwater model species, Daphnia magna." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7984/.

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In the 21st century - the era of big data science - chemical risk assessment procedures remain woefully dependent upon a suite of basic toxicological assays that offer little, if any, biochemical information pertaining to the underlying mechanism of toxicity. Metabolomics, defined as the holistic study of all naturally occurring, low molecular weight metabolites present within a biological system, holds huge potential as a tool to fill this knowledge gap, and thereby, to revolutionise the chemical risk assessment process through provision of rich molecular information . Owing to on-going chall
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11

Fay, TH, and JC Greeff. "A three species competition model as a decision support tool." Elsevier, 2007. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000167.

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An overcrowding problem of nyala, and lately also of impala in the Ndumo Game Reserve, South Africa, has been detrimental to other species and vegetation structures over a period of two decades. In the present study a deterministic model for three competing species (where two species tend to be overpopulated while the third faces probable localized extinction) is constructed, while future trends coupled with their coexistence are projected. On a mathematical basis, we seek reasons for the failure of the cropping strategies implemented by management over the last two decades, and suggest altern
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12

Richards, Andrew. "New Species Tree Inference Methods Under the Multispecies Coalescent Model." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618507147603501.

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13

Tian, Yuan. "Topics in Phylogenetic Species Tree Inference under the Coalescent Model." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480422907698897.

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14

Bowling, Ernest H. "A stand level multi-species growth model for Appalachian hardwoods." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104295.

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15

Zytynska, Sharon. "The genetics of species interactions in model and natural ecosystems." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/the-genetics-of-species-interactions-in-model-and-natural-ecosystems(a1aecf62-7e44-4645-b2ab-809105baf31d).html.

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Within an ecological community, interactions between species in a community occur directly, through physical contact, and indirectly, via other species or through abiotic environmental modification. Genetic variation within a species has the ability to alter the outcome of interactions between species. In other words, the specific genotypes of the interacting individuals are important for the outcome of the interaction. In this thesis, I begin by showing that indirect interactions between a soil rhizobacteria (Pseudomonas aeruginosa) and a parasitoid wasp (Aphidius rhopalosiphum) are mediated
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16

Glardon, Christian. "PREDICTING RISKS OF INVASION OF CAULERPA SPECIES IN FLORIDA." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4219.

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Invasions of exotic species are one of the primary causes of biodiversity loss on our planet (National Research Council 1995). In the marine environment, all habitat types including estuaries, coral reefs, mud flats, and rocky intertidal shorelines have been impacted (e.g. Bertness et al. 2001). Recently, the topic of invasive species has caught the public's attention. In particular, there is worldwide concern about the aquarium strain of the green alga Caulerpa taxifolia (Vahl) C. Agardh that was introduced to the Mediterranean Sea in 1984 from the Monaco Oceanographic Museum. Since that time
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17

Pelletier, Tara A. "Western Plethodon Salamanders as a Model System in Phylogeography." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429292290.

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18

Khem, Sarim. "Development of model fermented fish sausage from New Zealand marine species." Click here to access this resource online, 2009. http://hdl.handle.net/10292/807.

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Three New Zealand marine species, hoki (Macruronus novaezealandiae), kahawai (Arripis trutta) and trevally (Pseudocaranx dentex) were used to develop model fermented fish sausage. The formulation comprised fish mince, carbohydrate, minced garlic and salt in a mass ratio of 1 (fish): 0.15: 0.05: 0.03, respectively. The carbohydrate source was cooked rice or glucose. (Endogenous lactic acid bacteria (LAB) failed to ferment rice). Folate was also added to the mixture as a factor. The mixtures were extruded into 50 mL plastic syringes, where the needle end of the barrel had been excised by la
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19

Wang, Biao. "Development and Application of Genomic Resources in Non-model Bird Species." Doctoral thesis, Uppsala, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183645.

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Understanding the genetic basis of biological processes is a fundamental component of modern ecology and evolutionary biology studies. With the recent advent of next generation sequencing (NGS) technologies, it is now possible to perform large genome and transcriptome projects for ecologically important non-model species. In this thesis, I focused on the development and application of genomic resources of two non-model bird species, the black grouse (Tetrao tetrix) and the great snipe (Gallinago media). Using the chicken genome as a reference, I developed a reference guided NGS pipeline to ass
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20

Liu, Brendan F. "Developing a gene model for simulations that incorporates multi-species conservation." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91838.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 69-71).<br>The genetic architecture, the number, frequency, and effect size of disease causing alleles for many common diseases including Type 2 Diabetes is not fully understood. Genetic simulations can be used to make predictions under specified genetic architecture models. Models whose predictions are inconsistent with empirical data can be rejected. We extended a gene simulation model p
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21

Tison, Jean-Luc. "Genetic variation and inference of demographic histories in non-model species." Doctoral thesis, Stockholms universitet, Institutionen för molekylär biovetenskap, Wenner-Grens institut, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-109896.

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Both long-term environmental changes such as those driven by the glacial cycles and more recent anthropogenic impacts have had major effects on the past demography in wild organisms. Within species, these changes are reflected in the amount and distribution of neutral genetic variation. In this thesis, mitochondrial and microsatellite DNA was analysed to investigate how environmental and anthropogenic factors have affected genetic diversity and structure in four ecologically different animal species. Paper I describes the post-glacial recolonisation history of the speckled-wood butterfly (Para
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22

Edmunds, Jeffrey. "A study of a stage-structured model of two competing species." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289978.

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The purpose of this dissertation is to develop and study a competition model which, being capable of a wide range of population dynamics, will exhibit phenomena in multi-species interactions not seen in simpler models. We consider a structured, non-linear model of two competing species, each having three life stages. This model is based on a single-species model that has been used to demonstrate many interesting effects in population dynamics and, in particular, has been highly successful in describing and predicting the dynamics of insect populations in controlled laboratory experiments, A th
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23

Ede, Sarah Melinda. "Infrared and photocatalytic studies of model bacterial species for water treatment." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16438/1/Sarah_Ede_Thesis.pdf.

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The use of a CO2 infrared (IR) laser and photocatalysis for water treatment microorganism disinfection purposes was investigated. During CO2 infrared (IR) laser treatment E. cloacae inactivation was comparable to inactivation via ultraviolet (UV) treatment; however no inactivation of the more resistant B. subtilis endospores occurred. Fourier Transform Infrared-Attenuated Total Reflectance (FTIR-ATR) spectroscopy of the bacterial cells displayed increased polysaccharide contents after IR treatment. FTIR and Raman spectroscopy of simple carbohydrates before and after IR laser treatment
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Ede, Sarah Melinda. "Infrared and photocatalytic studies of model bacterial species for water treatment." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16438/.

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The use of a CO2 infrared (IR) laser and photocatalysis for water treatment microorganism disinfection purposes was investigated. During CO2 infrared (IR) laser treatment E. cloacae inactivation was comparable to inactivation via ultraviolet (UV) treatment; however no inactivation of the more resistant B. subtilis endospores occurred. Fourier Transform Infrared-Attenuated Total Reflectance (FTIR-ATR) spectroscopy of the bacterial cells displayed increased polysaccharide contents after IR treatment. FTIR and Raman spectroscopy of simple carbohydrates before and after IR laser treatment displaye
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25

Chai, Hui Hui. "Developing new approaches for transcriptomics and genomics : using major resources developed in model species for research in crop species." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14246/.

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With the estimated increase in global demand for food and over-reliance on staple food crops, the exploitation of agricultural biodiversity is important to address food security challenges. The aim of this study is to develop approaches to transfer major informational and physical resources developed in model plant and major crop species to resources poor crop species, using oil palm and Bambara groundnut as two exemplar crops. XSpecies (cross-species) approach, the core approach of the study, is described as the approach which uses microarrays developed for a given species to analyse another
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26

Camargo, Bentaberry Arley. "Species Trees and Species Delimitation with Multilocus Data and Coalescent-based Methods: Resolving the Speciation History of the Liolaemus darwinii Group (Squamata, Tropiduridae)." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2649.

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The inference of species boundaries and phylogenetic relationships are fundamental for evolutionary, ecological, and conservation studies. The resolution of species boundaries and the inference of phylogenetic relationships among species are required to define the units of analysis and to find the most closely related units for evaluating alternative models of speciation. I highlight lizards as model organisms for ecological and evolutionary studies, emphasizing their contributions to advances in understanding linkages between phylogeography and speciation. In this dissertation, I focus on the
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27

Gurr, Jessica. "Developing Genomic Tools for the Management of Threatened Species." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18855.

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Despite a revolution in DNA sequencing and genotyping technologies in the past decade there still exists a deficit in genomic resources for many threatened species. As a result, these species are not always being managed as effectively as possible. Single nucleotide polymorphisms (SNPs) hold great promise for illuminating the genetic characteristics of mammalian populations and monitoring their genetic health. Unfortunately, many techniques for SNP discovery are still beyond the reach of conservation projects. This thesis describes two cost-effective techniques for identifying SNPs in non-mode
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28

Ghiu, Silvana Melania Stefania. "Mass Transfer of Ionic Species in Direct and Reverse Osmosis Processes." [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000176.

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29

Guillaumot, Charlène. "Modelling the response of Antarctic marine species to environmental changes. Methods, applications and limitations." Doctoral thesis, Universite Libre de Bruxelles, 2021. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/327073.

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Among tools that are used to fill knowledge gaps on natural systems, ecological modelling has been widely applied during the last two decades. Ecological models are simple representations of a complex reality. They allow to highlight environmental drivers of species ecological niche and better understand species responses to environmental changes. However, applying models to Southern Ocean benthic organisms raises several methodological challenges. Species presence datasets are often aggregated in time and space nearby research stations or along main sailing routes. Data are often limited in n
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Khalil, Hala. "Model Medicago species for studies of low temperature signaling and cold acclimation." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30844.

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To identify a model legume experimental system for studying low temperature signaling and cold acclimation, cold-induced expression and regulation of homologues of alfalfa (Medicago sativa) cold acclimation-specific genes cas15 and cas30 were examined in M. arborea (relatively frost tolerant) and M. truncatula (relatively frost sensitive). Both cas15 and cas30 genes are present in the genomes of both species but whereas both genes are cold-induced in M. arborea, only cas15 is induced in M. truncatula. Cold-induced expression of these genes is inhibited by calcium chelators and channel blockers
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31

Gibb, Jason Ocean Telford. "NMR studies on the effects of model pollutants in selected invertebrate species." Thesis, Birkbeck (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268053.

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32

Perera, Nicola Krystyna. "An investigation of local adaptation in the model plant species Arabidopsis thaliana." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/30212.

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Species extinction rates are causing alarm. Anthropogenic distortion of the climate system is rapidly altering the natural environment. Arabidopsis thaliana is a model species in molecular biology with widespread wild populations showing functional diversity however its ecology and evolution is poorly understood. Faced with a changing natural world, what is the adaptive potential of the model plant species Arabidopsis thaliana? This thesis focuses on the interactions of genotypes, phenotypes and environments to assess the current state of adaptation in this vagile species and to identify mecha
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33

Mills, Catherine. "Competition between specialist and generalist species in computational and experimental model ecosystems." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25502.

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An ecological community is complex and the mechanisms behind the assembly of such a community are still poorly understood. Here, we concentrate on the question of what mechanisms affect the proportion of specialists and the proportion of generalists in a community. First, we use an individual-based model to explore the effects of the available resource spectrum on the specialist-generalist balance in well-mixed and spatially structured environments. In the well-mixed model, we uncover a new mechanism which we term `resource spectrum engineering', in which opportunistic specialists occupying sm
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34

Clifford, Philip A. (Philip Alan). "Validation of a Coupled Herbicide Fate and Target Plant Species Effects Model." Thesis, University of North Texas, 1989. https://digital.library.unt.edu/ark:/67531/metadc332422/.

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A series of experiments provided data to parameterize and validate a coupled herbicide fate and target plant species effects model. This simulation model is currently designed to predict responses of water hyacinth populations to treatments of the dimethylamine formulation of 2,4- dichloro-phenoxy acetic acid (2,4-D -DMA). Experiments investigated 1) the response of water hyacinth to varying exposures of 2,4-D (DMA); 2) the role of water hyacinth density and herbicide interception in treatment effectiveness using 2,4-D (DMA); and 3) the importance of root exposure to obtain control of water hy
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Beebe, Taylor A. "A two host species stage-structured model of West Nile virus transmission." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4225.

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We develop and evaluate a novel host-vector model of West Nile virus (WNV) transmission that incorporates multiple avian host species and host stage-structure (juvenile and adult stages), with both species-specific and stage-specific biting rates of vectors on hosts. We use this model to explore WNV transmission dynamics that occur between vectors and multiple structured host populations as a result of heterogeneous biting rates. Our analysis shows that increased exposure of juvenile hosts results in earlier, more intense WNV transmission when compared to the effects of differential host speci
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36

Chen, Buxin. "Prion species barrier at the short phylogenetic distances in the yeast model." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/29762.

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Thesis (Ph.D)--Biology, Georgia Institute of Technology, 2009.<br>Committee Chair: Chernoff, Yury; Committee Member: Bommarius, Andreas; Committee Member: Doyle, Donald; Committee Member: Lobachev, Kirill; Committee Member: Yi, Soojin. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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37

Fitzgerald, Jennifer. "The effects of hypoxia on chemical toxicity in two model fish species." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/26957.

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Hypoxia is a global and increasingly important stressor in aquatic ecosystems, with major impacts on biodiversity worldwide. Hypoxic waters are often contaminated with a wide range of chemicals but knowledge is limited about the interactions between hypoxia and chemical stressors. Therefore, during this PhD I set out to investigate how the concentration of oxygen in the water influences chemical toxicity in fish. My work focused on two groups of chemicals: toxic metals, of which copper was used as an example, and anti-androgenic chemicals. Copper is an essential metal, widespread in the aquati
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Francis, Owen Eric. "Species Identification and Strain Attribution with Unassembled Sequencing Data." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3200.

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Emerging sequencing approaches have revolutionized the way we can collect DNA sequence data for applications in bioforensics and biosurveillance. In this research, we present an approach to construct a database of known biological agents and use this database to develop a statistical framework to analyze raw reads from next-generation sequence data for species identification and strain attribution. Our method capitalizes on a Bayesian statistical framework that accommodates information on sequence quality, mapping quality and provides posterior probabilities of matches to a known database of t
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Wang, Yuancheng. "Performance of supertree methods for estimating species trees." Thesis, University of Canterbury. Mathematics and Statistics, 2010. http://hdl.handle.net/10092/4644.

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Phylogenetics is the research of ancestor-descendant relationships among different groups of organisms, for example, species or populations of interest. The datasets involved are usually sequence alignments of various subsets of taxa for various genes. A major task of phylogenetics is often to combine estimated gene trees from many loci sampled from the genes into an overall estimate species tree topology. Eventually, one can construct the tree of life that depicts the ancestor-descendant relationships for all known species around the world. If there is missing data or incomplete sampling in t
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40

[Verfasser], Umaporn Rungroekrit. "Alternative methods of semen preservation: a pig model for endangered species / Umaporn Rungroekrit." Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2014. http://d-nb.info/1065276117/34.

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41

Mourabit, Sulayman. "Establishing the mangrove killifish, Kryptolebias marmoratus, as a model species for developmental biology." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/8461.

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The mangrove killifish, Kryptolebias marmoratus, has the potential of becoming a strong model organism for a range of biological disciplines thanks to its ability to self-fertilise, a process only known to occur in invertebrate animals until its discovery. Selfing, a natural occurrence in this species, has lead to the formation of clonal lineages composed of highly homozygous individuals. The aim of this thesis was to further establish K. marmoratus in the field of developmental biology by providing an information infrastructure to help advance research on this peculiar animal and further prom
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42

Bieleveld, Michel Jan Marinus. "Improving species distribution model quality with a parallel linear genetic programming-fuzzy algorithm." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-26012017-113329/.

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Biodiversity, the variety of life on the planet, is declining due to climate change, population and species interactions and as the result f demographic and landscape dynamics. Integrated model-based assessments play a key role in understanding and exploring these complex dynamics and have proven use in conservation planning. Model-based assessments using Species Distribution Models constitute an efficient means of translating limited point data to distribution probability maps for current and future scenarios in support of conservation decision making. The aims of this doctoral study were to
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Fraser, Murray. "Modelling airlift photobioreactors for algal bioenergy, using Scenedesmus sp. as the model species." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/12620.

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Includes bibliographical references<br>Rising global energy demands and global warming concerns from fossil derived fuels are two major problems affecting future generations. Bioenergy from algae offers a part solution that is both attractive and sustainable, by supplementing energy demands from a renewable energy source (the sun) and consuming carbon dioxide in the process. Bioenergy from algae is a proven concept (e.g algal biodiesel), yet the low productivities and high costs of existing processes limit their ability to make a significant contribution. Algae production occurs in specially d
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Morio, Kimberly Ann. "Development of a new multi-species, in vitro model for root canal disinfection." Thesis, University of Iowa, 2016. https://ir.uiowa.edu/etd/6810.

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Bacterial disinfection of the root-canal system is the goal in achieving a successful root canal treatment. Currently, this is accomplished by mechanical and chemical debridement. However, limitations continue to exist with these processes and bacteria can still remain, resulting in potential failure of treatment. The aims of this study were to develop a stable, reproducible polymicrobial biofilm in human teeth and utilize this model to compare the bactericidal activity of the UV light disinfection to current root canal chemo-mechanical debridement techniques. We hypothesized that use of UV li
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Bouchafra, Yassine. "On the performance of subsystem approaches to model heavy element species in solution." Thesis, Lille, 2019. http://www.theses.fr/2019LIL1R031.

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Afin de comprendre les mesures spectroscopiques, il est d'une grande importance de comprendre les processus physiques au niveau microscopique à cause du rôle des électrons (et des noyaux) dans le système. Le traitement de ces particules nécessite, au moins, un niveau de mécanique quantique pour le système d'intérêt. La présence des éléments lourds dans le système aggrave la situation à cause de l'obligation de tenir en compte, en plus du grand nombre de particules, les effets relativistes. Après un premier chapitre sur les différentes méthodes théorique, le second chapitre explore les méthodes
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Köchy, Martin, and Katja Tielbörger. "Hydrothermal time model of germination : parameters for 36 Mediterranean annual species based on a simplified approach." Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2007/1240/.

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Germination rates and germination fractions of seeds can be predicted well by the hydrothermal time (HTT) model. Its four parameters hydrothermal time, minimum soil temperature, minimum soil moisture, and variation of minimum soil moisture, however, must be determined by lengthy germination experiments at combinations of several levels of soil temperature and moisture. For some applications of the HTT model it is more important to have approximate estimates for many species rather than exact values for only a few species. We suggest that minimum temperature and variation of minimum moisture ca
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Ullah, Ikram. "Probabilistic Models for Species Tree Inference and Orthology Analysis." Doctoral thesis, KTH, Beräkningsbiologi, CB, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168146.

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A phylogenetic tree is used to model gene evolution and species evolution using molecular sequence data. For artifactual and biological reasons, a gene tree may differ from a species tree, a phenomenon known as gene tree-species tree incongruence. Assuming the presence of one or more evolutionary events, e.g., gene duplication, gene loss, and lateral gene transfer (LGT), the incongruence may be explained using a reconciliation of a gene tree inside a species tree. Such information has biological utilities, e.g., inference of orthologous relationship between genes. In this thesis, we present pr
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Schwartz, Lauren Michele. "A comparative study of the population dynamics of four Amaranthaceae species." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1087.

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Some of the most problematic agricultural weeds found in the Midwest United States are found in the Amaranthaceae family, such as Amaranthus palmeri and A. tuberculatus. These summer annual weeds are troublesome due to their competitive ability, high seed production, and resistance to herbicides from several modes of action which complicates management in field crops and has led to significant yield loss. Achyranthes japonica and Iresine rhizomatosa are two perennial species in the same family as A. palmeri and A. tuberculatus that occur in similar habitats as one another, but differ in invasi
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Muñoz, Mas Rafael. "Multivariate approaches in species distribution modelling: Application to native fish species in Mediterranean Rivers." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/76168.

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This dissertation focused in the comprehensive analysis of the capabilities of some non-tested types of Artificial Neural Networks, specifically: the Probabilistic Neural Networks (PNN) and the Multi-Layer Perceptron (MLP) Ensembles. The analysis of the capabilities of these techniques was performed using the native brown trout (Salmo trutta; Linnaeus, 1758), the bermejuela (Achondrostoma arcasii; Robalo, Almada, Levy & Doadrio, 2006) and the redfin barbel (Barbus haasi; Mertens, 1925) as target species. The analyses focused in the predictive capabilities, the interpretability of the models an
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Allen, Jennifer C. "Species-Habitat Relationships for the Breeding Birds of a Longleaf Pine Ecosystem." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/31670.

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At the Fort Bragg Military Installation, an army base in North Carolina, the habitat associations for the breeding bird species and the effects of the current prescribed fire program on the avifauna are virtually unknown. Fort Bragg encompasses one of the largest, fire-dependent longleaf pine systems existing today and is a mosaic of forested habitats. I used bird count data collected during 1994-1997 at 50-m fixed radius point count stations to examine bird species-habitat relationships in relation to fire treatment (i.e., fire intense longleaf pine woodlands versus fire suppressed mixed pi
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