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.
Results
Showing 1 to 20 of 113 for “"Phylogenetic tree"”.
-
Phylogenetic Tree Inferences Using Quartet Splits
<p>Phylogenetic trees are used by evolutionary biologists and geneticists as a way of classifying the relationships between different taxonomic units (i.e. species, subspecies, genes). The branching of a tree represents one taxonomic unit evolving into two or more different units. These events are …
-
Algorithms for phylogenetic tree correction in species and cancer evolution
Reconstructing evolutionary trees, also known as phylogenies, from molecular sequence data is a fundamental problem in computational biology. Classically, evolutionary trees have been estimated over a set of species, where leaves correspond to extant species and internal nodes correspond to …
-
Markov chain Monte Carlo and its applications to phylogenetic tree construction
… application of Bayesian methods to problems in phylogenetics. Specifically, we focus on using genetic data to estimate phylogenetic trees representing the evolutionary history of genes and species. Knowledge of this common ancestry has implications for the identification of functions and …
-
Molecular phylogenetics, systematics, reproductive safeguarding and chromosome evolution of the genus Lachenalia (Asparagaceae: Scilloideae)
… to infer a well-resolved and robustly supported phylogenetic tree using Sanger sequencing of candidate loci and/or morphological characters have been largely unsuccessful. A new phylogenetic hypothesis for Lachenalia is presented, using multi-locus sequence data sampled from living material of …
-
Hierarchy Aligned Commonality Through Prototypical Networks: Discovering Evolutionary Traits over Tree-of-Life
… a group of species with a shared ancestor in the Tree of Life (also referred to as phylogenetic tree). With the recent availability of large-scale image repositories in biology and advances in the field of explainable machine learning (ML) such as ProtoPNet and other prototype-based methods, there …
-
Advances in Bayesian Hierarchical Modeling with Tree-based Methods
… especially suitable for this task is the P\'olya tree type models. Following a divide-and-conquer strategy, these tree-based methods transform the original task into a series of tasks that are smaller in size and easier to solve while their nonparametric nature guarantees the modeling flexibility …
-
Evaluating human fecal contamination sources in Kranji Reservoir Catchment, Singapore
… marker samples were sequenced and mapped using a phylogenetic tree to confirm their similarity in base order to the human factor identified in the temperate climate. The indicator bacteria (E. coli) results showed consistently high E. coli concentrations (geometric mean 3240 CFU/100 ml) in dry and …
-
An Inquiry Concerning the Nature of Racial Discourse
… natural kinds or distinct parts of the human phylogenetic tree. I show—on both empirical and theoretical grounds—that the reality of race cannot be supported in this way. Then, I turn to evolutionary biology and psychology for a proper account of race that can underwrite racial discourse. …
-
The Isolation and Characterization of the Microbial Flora in the Alimentary Canal of <em>Gromphadorhina portentosa</em> Based on rDNA Sequences.
… the isolates' identities and place them using a phylogenetic tree analysis. Eubacterial, Archaeal, and Eukaryotic organisms were found present in the hissing roach gut which can serve as a model ecosystem since it houses Eubacterial, Archaeal, and Eukaryotic organisms.</p>
-
HORIZONTAL GENE TRANSFER (HGT) AND SPHAGNUM FALLAX: A PHYLOGENETIC LOOK INTO THE OCCURRENCE, PREVALENCE, AND IMPORTANCE OF HORIZONTAL GENE TRANSFER IN A BOG MOSS
… bog moss known as Sphagnum fallax and performed phylogenetic analyses for each protein sequence/family. The topologies of each constructed phylogenetic tree were studied to find evidence of HGT involving S. fallax. Twenty-three candidate sequences were classified as contaminants, 10 were …
-
Functional genomic studies of regeneration in the planarian Schmidtea mediterranea
… are seen in varying degrees throughout the phylogenetic tree. Are the genes and signaling pathways employed by regeneration found in all metazoans and recruited by mechanisms conserved in regenerative organisms, or have organisms developed ways to recruit them de novo? We brought the power …
-
Molecular biological studies of Southern African isolates of maize streak virus
… restrict ion patterns were used to construct a phylogenetic tree of all the MSV isolates so far characterised at the genomic leve 1. A fourth geminivirus (DGV) which infects the grass Digitaria sanguinalis, was compared to known isolates of MSV in order to confirm its identification as an MSV …
-
On the phylogenetic relationship of South African species of Cladophora (Chlorophyta) based on the 26S (LSU) gene region
… The aims of this study were to provide a robust phylogenetic tree describing the relationship between members of the genus Cladophora and related taxa and to determine the origins of South Africa's estuarine species of Cladophora. After DNA extraction and cycle sequencing of products, sequences …
-
Genetic introgression and female mate choice within the Calendulauda albescens/C. barlowi hybrid zone
… sequence was obtained. The neighbour-joining phylogenetic tree obtained revealed two distinct clades, a C. albescens and C. barlowi clade. The C. barlowi clade was supported with a bootstrap value of 100. The C. albescens clade contained individuals of intermediate morphology, as represented …
-
Towards characterizing the solution space of the 1-Dollo Phylogeny problem
… data, we can model the mutation process with a phylogenetic tree. One representative model is the k-Dollo parsimony, where all observed mutations mutate from a single normal cell and each character of a cell is gained at most once and lost at most k times. We examine the 1-Dollo Phylogeny …
-
Stochastic modeling of biological sequence evolution
… sequence data from populations with well-known phylogenetic relationships. Such data is not always available since phylogenetic relationships can never be known with certainty. We propose generating sequence data for the purpose of estimation technique evaluation by simulating sequence evolution …
-
Senecavirus A: Epidemiology, Pathogenesis and Infection Dynamics
… and environmental samples was determined and phylogenetic analysis was performed. This analysis revealed that all the contemporary SVA isolates (obtained during 2014-2015) cluster together in a phylogenetic tree. However, a significant difference was found between contemporary and historical …
-
Genetic and morphological diversity in the Icelandic woodland strawberry (Fragaria vesca L.)
… DNA. The results were used to construct a phylogenetic tree using the Neighbor-Joining method. The results indicate some level of biodiversity within the Icelandic population both morphologically and genetically. The morphology assessment separates the Icelandic populations in two …
-
Engineering antimicrobial strains of saccharomyces cerevisiae as industrial platform for non-sterile bioprocesses
… to predict AMP tertiary structures, construct a phylogenetic tree, and analyse mutation effects, respectively.
Page 1 of 6