The graph-theoretic operation of rooted subtree prune and regraft is increasingly being used as a tool for understanding and modelling reticulation events in evolutionary biology. In this paper, we show that computing the rooted subtree prune and regraft distance between two rooted binary phylogenetic trees on the same label set is NP-hard. This resolves a longstanding open problem. Furthermore...

Transparent architecture and controllable performance are prime considerations in the design of large instrumentation. The vast amount of aspects involved, many of which need careful consideration, necessitates a design methodology. Already system reticulation into four or five goal-oriented structures, in combination with a hierarchy in design phases, can lead to sufficient control over the de...

Galled networks, directed acyclic graphs that model evolutionary histories with reticulation cycles containing only tree nodes, have become very popular due to both their biological significance and the existence of polynomial time algorithms for their reconstruction. In this paper we prove that Nakhleh’s m measure is a metric for this class of phylogenetic networks and hence it can be safely u...

OBJECTIVE Characteristic high-resolution CT (HRCT) findings of idiopathic pulmonary fibrosis (IPF) include reticulation, architectural distortion, and honeycombing involving mainly the lung periphery and the lower lobes. In 50% of IPF patients, HRCT is nonspecific. This article illustrates the HRCT findings of IPF correlating with the pathology. CONCLUSION The spectrum of HRCT manifestations ...

Abstract In this paper, studies concerning the changes brought by gamma radiation on some PVC plates were made. The respective samples exposed to irradiation, at room temperature and different doses, such as (10, 20, 40, 80) kGy. in irradiated plates’ properties studied UV-Vis, electrical measurements, SEM analysis non-irradiated samples. results show that irradiation affects of plates. This de...

The multispecies coalescent (MSC) is a statistical framework that models how gene genealogies grow within the branches of a species tree. The field of computational phylogenetics has witnessed an explosion in the development of methods for species tree inference under MSC, owing mainly to the accumulating evidence of incomplete lineage sorting in phylogenomic analyses. However, the evolutionary...

PURPOSE Corneal fibroblast cell (CFC) reticulation is involved in the structural development of corneal stroma and in wound healing. In an earlier paper, it was reported that the expression of VEGFR-1 by CFCs is related to their reticulogenic properties in vitro and decreases with the age of the donors. The present study was focused on the nonreticulogenic corneal fibroblast population and expl...