In this paper, we prove the following Theorem. Theorem 1. Let p be a distribution realized by a minimal PRFA of size d, B = (P,S) be a complete and residual basis, we denote by σd the d-th largest singular values of (pu(v))u∈R. LetD be a training set of words generated by p, we denote by n the number of time the least occurring prefix of P appears in D (n = minu∈P |{∃v ∈ Σ|uv ∈ D}|). For all 0 ...

Ers has been qualified as the PrfA-like transcriptional regulator of Enterococcus faecalis. In a previous study we reported that Ers is important for the survival within macrophages of this opportunist pathogenic bacterium. In the present work we have used proteomic and microarray expression profiling of E. faecalis JH2-2 and an ers-deleted mutant (Delta ers mutant) strains to define the Ers re...

Detection of pathogens in contaminated food products by PCR can result in false-positive data due to the amplification of DNA from nonviable cells. A new method based on reverse transcription-PCR (RT-PCR) amplification of mRNA for the specific detection of viable Listeria monocytogenes was developed. The expression of three L. monocytogenes genes, iap, hly, and prfA, was examined to determine a...

Listeria monocytogenes is of major concern in the fermented meat products and is able to persist in their processing environments. The aim of the present work was to evaluate the virulence profile and the persistence capacity of L. monocytogenes strains isolated in Sardinian fermented sausages processing plants. Food (ground meat, sausages at the end of acidification and ripening stage) and env...

We introduce a new class of probabilistic automata: Probabilistic Residual Finite State Automata. We show that this class can be characterized by a simple intrinsic property of the stochastic languages they generate (the set of residual languages is finitely generated) and that it admits canonical minimal forms. We prove that there are more languages generated by PRFA than by Probabilistic Dete...

The population of Listeria monocytogenes and the expression five virulence stress-related genes in pressurized dry-cured ham were monitored throughout storage at 4 °C. L. strains S2 (serotype 1/2a) S7-2 4b) exhibited a moderate resistance to high pressure processing (HPP) 450 MPa for 10 min or 600 5 min. low water activity (aw) sliced (aw = 0.88) diminished efficacy treatments, with pathogen re...