Phylogenetics is concerned with inferring the genealogical relationships between a group of organisms (or taxa), and this relationship is usually expressed as an evolutionary tree. However, inferring the phylogenetic tree is not a trivial task since it is impossible to know the true evolutionary history for a set of organisms. As a result, most phylogenetic analyses rely on effective heuristics...

Tree carbon (C) and nitrogen (N) concentrations C:N ratio are critical for understanding the elemental compositions of forests, N use efficiency, productivity biogeochemical cycles. We evaluate differences in C allocation among biomass compartments three N‑fixing tree species Espinal Argentine eco-region; scaling relationship between variation size. Neltuma affinis (Spreng.) C.E. Hughes & G...

We investigate a new width parameter, the fusion-width of a graph. It is a natural generalization of the tree-width, yet strong enough that not only graphs of bounded tree-width, but also graphs of bounded clique-width, trivially have bounded fusion-width. In particular, there is no exponential growth between tree-width and fusion-width, as is the case between tree-width and clique-width. The n...

To construct an evolutionary tree is an important topic in computational biology. An evolutionary tree can symbolize the relationship and histories for a set of species. There are many models had been proposed to resolve these problems. However, most of them are NP-hard problem. Ultrametric tree is one of the most popular models, it is used by a well-accepted tree construction method--Unweighte...

Dominance trees have been used as a means for reengineering legacy systems into potential reuse candidates. The dominance relation suggests the reuse candidates which are identified by strongly directly dominated subtrees. We review the approach and illustrate how the dominance tree may fail to show the relationship between the strongly directly dominated procedures and the directly dominated p...

In order to evaluate the possible correlation between the tree density and the human population density, the forested area in Nav Asalem district located in Guilan Province was selected. The descriptors of tree number and basal area per hectare as well as the stand density index were used to determine the tree density, which was conducted from a 2014 forest inventory including 62 cluster (558 p...