Transition invariants play an important role in the analysis of Petri nets. They determine cycles within a system. In this paper we present a categorical characterization of transition invariants in algebraic high-level (AHL) nets. Thus, when transforming or composing AHL nets using categorical structuring techniques , a suitable transformation or composition of their invariants becomes possibl...

Citation: Hartmann A and Schikora A (2015) Editorial: Plant responses to bacterial quorum sensing molecules. Since the discovery of the phenomenon in the 70s and the introduction of the term two decades later (Nealson et al., 1970; Fuqua and Winans, 1994), our knowledge about quorum sensing (QS) in bacterial populations has reached a quite high level. Moreover, throughout the last years progres...

In chronic experiments on rabbits it has been shown that destruction of dorsal amygdalofugal ways leads to full and persistent blockade of hippocampal theta-rhythm. To elucidate the causes irreversible changes in different areas of the hippocampus and the medial nucleus of septum morphological studies were carried out in neurons and glial cells of bazolateral (AB), central (AC), lateral (AL) an...

Quorum sensing (QS) is a means of cell-to-cell communication that uses diffusible signaling molecules that are sensed by the population to determine population density, thus allowing co-ordinate gene regulation in response to population density. In Pseudomonas aeruginosa, production of the QS signaling molecule, N-acyl homoserine lactone (AHL), co-ordinates expression of key factors of pathogen...

Quorum-quenching catalysts are of interest for potential application as biochemical tools for interrogating interbacterial communication pathways, as antibiofouling agents, and as anti-infective agents in plants and animals. Herein, the structure and function of AidC, an N-acyl-l-homoserine lactone (AHL) lactonase from Chryseobacterium, is characterized. Steady-state kinetics show that zinc-sup...

Many pathogenic bacteria use quorum sensing (QS) systems to regulate the expression of virulence genes in a density-dependent manner. In one widespread QS paradigm the enzyme LuxI generates a small diffusible molecule of the acyl-homoserine lactone (AHL) family; high cell densities lead to high AHL levels; AHL binds the transcription factor LuxR, triggering it to activate gene expression at a v...

OBJECTIVE Similar to amblyopia in the visual system, "amblyaudia" is a term used to describe persistent hearing difficulty experienced by individuals with a history of asymmetric hearing loss (AHL) during a critical window of brain development. Few clinical reports have described this phenomenon and its consequent effects on central auditory processing. We aim to (1) define the concept of ambly...

The “classical” approach to represent Petri nets by graph transformation systems is to translate each transition of a specific Petri net to a graph rule (behavior rule). This translation depends on a concrete model and may yield large graph transformation systems as the number of rules depends directly on the number of transitions in the net. Hence, the aim of this paper is to define the behavi...