Search Results for author: Marc Hellmuth

Found 10 papers, 1 papers with code

The weighted total cophenetic index: A novel balance index for phylogenetic networks

no code implementations17 Jul 2023 Linda Knüver, Mareike Fischer, Marc Hellmuth, Kristina Wicke

For example, for phylogenetic trees, it is common to use balance indices to draw conclusions concerning the underlying evolutionary model, and more than twenty such indices have been proposed and are used for different purposes.

The Theory of Gene Family Histories

no code implementations24 Apr 2023 Marc Hellmuth, Peter F. Stadler

Most genes are part of larger families of evolutionary related genes.

Relative Timing Information and Orthology in Evolutionary Scenarios

no code implementations5 Dec 2022 David Schaller, Tom Hartmann, Manuel Lafond, Nicolas Wieseke, Peter F. Stadler, Marc Hellmuth

The relative timing information of gene and species divergences is captured by three colored graphs that have the extant genes as vertices and the species in which the genes are found as vertex colors: the equal-divergence-time (EDT) graph, the later-divergence-time (LDT) graph and the prior-divergence-time (PDT) graph, which together form an edge partition of the complete graph.

Clustering Systems of Phylogenetic Networks

no code implementations28 Apr 2022 Marc Hellmuth, David Schaller, Peter F. Stadler

The main results are correspondences of classes of networks and clustering system of the following form: If $N$ is a network of type $\mathbb{X}$, then $\mathcal{C}_N$ satisfies $\mathbb{Y}$, and conversely if $\mathscr{C}$ is a clustering system satisfying $\mathbb{Y}$ then there is network $N$ of type $\mathbb{X}$ such that $\mathscr{C}\subseteq\mathscr{C}_N$. This, in turn, allows us to investigate the mutual dependencies between the distinct types of networks in much detail.

Clustering

Cayley Graphs of Semigroups Applied to Atom Tracking in Chemistry

no code implementations9 Aug 2021 Nikolai Nøjgaard, Walter Fontana, Marc Hellmuth, Daniel Merkle

While atom tracking with isotope-labeled compounds is an essential and sophisticated wet-lab tool in order to, e. g., illuminate reaction mechanisms, there exists only a limited amount of formal methods to approach the problem.

From Modular Decomposition Trees to Rooted Median Graphs

no code implementations11 Mar 2021 Carmen Bruckmann, Peter F. Stadler, Marc Hellmuth

The modular decomposition of a symmetric map $\delta\colon X\times X \to \Upsilon$ (or, equivalently, a set of symmetric binary relations, a 2-structure, or an edge-colored undirected graph) is a natural construction to capture key features of $\delta$ in labeled trees.

Combinatorics Discrete Mathematics

Arc-Completion of 2-Colored Best Match Graphs to Binary-Explainable Best Match Graphs

no code implementations11 Mar 2021 David Schaller, Manuela Geiß, Marc Hellmuth, Peter F. Stadler

For the special case of two-colored BMGs, this leads to a characterization of the least resolved trees (LRTs) of binary-explainable trees and a simple, polynomial-time algorithm for the minimum cardinality completion of the arc set of a BMG to reach a BMG that can be explained by a binary tree.

Data Structures and Algorithms Discrete Mathematics Combinatorics Populations and Evolution

Least resolved trees for two-colored best match graphs

no code implementations18 Jan 2021 David Schaller, Manuela Geiß, Marc Hellmuth, Peter F. Stadler

Introducing the concept of support vertices we derive an $O(|V|+|E|\log^2|V|)$-time algorithm to recognize 2-BMGs and to construct its LRT.

Vocal Bursts Valence Prediction

Indirect Identification of Horizontal Gene Transfer

no code implementations16 Dec 2020 David Schaller, Manuel Lafond, Peter F. Stadler, Nicolas Wieseke, Marc Hellmuth

An edge in an LDT graph implies that the two corresponding genes are separated by at least one HGT event.

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