Learn More
Food spoilage is a complex process and excessive amounts of foods are lost due to microbial spoilage even with modern day preservation techniques. Despite the heterogeneity in raw materials and processing conditions, the microflora that develops during storage and in spoiling foods can be predicted based on knowledge of the origin of the food, the substrate(More)
The fish pathogen Vibrio anguillarum produces quorum sensing signal molecules, N-acyl homoserine lactones (AHLs), which in several Gram-negative human and plant pathogenic bacteria regulate virulence factors. Expression of these factors can be blocked using specific quorum-sensing inhibitors (QSIs). The purpose of this study was to investigate the effect of(More)
AIMS To profile the quorum-sensing (QS) signals in Yersinia ruckeri and to examine the possible regulatory link between QS signals and a typical QS-regulated virulence phenotype, a protease. METHODS AND RESULTS Liquid chromatography-high resolution mass spectrometry (HPLC-HRMS) showed that Y. ruckeri produced at least eight different acylated homoserine(More)
Bacterial communication signals, acylated homoserine lactones (AHLs), were extracted from samples of commercial bean sprouts undergoing soft-rot spoilage. Bean sprouts produced in the laboratory did not undergo soft-rot spoilage and did not contain AHLs or AHL-producing bacteria, although the bacterial population reached levels similar to those in the(More)
REASONS FOR PERFORMING STUDY Subjective evaluation of mild lameness has been shown to have poor interobserver reliability. Traditional methods of objective lameness evaluation require specialised conditions and equipment. Wireless inertial sensor systems have been developed to allow for simple, rapid, objective lameness detection in horses trotted over(More)
Flow cytometry was investigated as a rapid method to determine the antibacterial effect of the bacteriocins nisin, pediocin PA-1, and sakacin A on the indicator organisms Lactobacillus reuteri DSM 12246, Lactobacillus sakei NCFB 2714 and Lactobacillus sakei DSM 20017, respectively. Fluorescence intensities of the cells were measured by flow cytometry upon(More)
Many pathogens control production of virulence factors by self-produced signals in a process called quorum sensing (QS). We demonstrate that acyl homoserine lactone (AHL) signals, which enable bacteria to express certain phenotypes in relation to cell density, are produced by a wide spectrum of Aeromonas salmonicida strains. All 31 typical strains were AHL(More)
A collection of 381 Listeria monocytogenes strains was examined for strain variations in nisin and pediocin sensitivity at three different concentrations on Tryptic Soya Agar. Two of the strains were able to grow on agar plates containing 500 IU nisin ml-1. These strains were characterized as having an enhanced nisin tolerance. Twenty strains had normal(More)
During reuterin production by Lactobacillus reuteri in a chemostat, the growth, substrate and metabolite concentrations showed oscillatory behaviour. The sensitivity of L. reuteri towards reuterin was shown to be a possible explanation of the oscillatory behaviour. A deterministic mathematical model consisting of four coupled differential equations(More)
  • Maria Rasch
  • International journal of food microbiology
  • 2002
The inhibitory effect of reuterin on Escherichia coli K12 was investigated at different conditions of temperature (10-30 degrees C), pH (4.5-6.5), and NaCl (0.5-3% (w/v)). The maximum specific growth rate as a function of the different environmental conditions was modelled with a polynomial model. At increasing temperatures, there was an increasing effect(More)