This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.
Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.
Hard copies of all theses are available for loan at WUR Library. To request them, click the link Request this publication in the full record presentation. This is a fee based service.
forest policy - coordination - intersectoral planning - multiple use - austria - netherlands
Abstract: Inter-sectoral coordination has become a central issue in different forest policy arenas worldwide and is considered to be essential for solving a whole range of problems the forest sector is currently facing
Abstract: The number of food poisoning cases caused by enteropathogens has increased in recent years. A significant part of the outbreaks associated with the consumption of raw vegetables has been attributed to Escherichia coli O157:H7 and Salmonella enterica subsp. enterica serovar Typhimurium. Bovine manure and slurry are the main environmental sources of these pathogens. Thus, reduction of the multiplication of E. coli O157:H7 and Salmonella serovar Typhimurium in cattle and their survival in manure and slurry are important tasks to minimize the risks of contamination of plant products and outbreaks of food-borne diseases. This thesis describes the influence of various environmental factors on survival of E. coli O157:H7 and Salmonella serovar Typhimurium in manure, slurry and soil amended with manure or slurry. The results presented in this thesis can be used for risk assessment of E. coli O157:H7 and Salmonella serovar Typhimurium in dairy farming systems and will help to identify and evaluate potential control strategies to minimize the chance of pathogen spread in the vegetable production chain.
Abstract: The food-borne pathogen Listeria monocytogenes is a Gram-positive facultative anaerobic rod, which is the causative agent of listeriosis. Due to the severity of the disease and the fact that its incidence is increasing in numerous European countries, L. monocytogenes is of great public health concern. This bacterium shows relatively high resistance to environmental insults compared with many other non-spore-forming food-borne pathogens. It is able to grow at low pH, at high salt concentrations, and low temperatures. The possibility that this pathogen (cross-) contaminates food products is a major concern for the food industry. Therefore, it is important to investigate the diversity in growth potential and stress resistance (mechanisms) of L. monocytogenes strains during exposure to commonly used preservation conditions. Several approaches are described in this thesis, including comparison of stress resistance and growth limits of a large collection of natural isolates, screening a mutant library for stress sensitive mutants, and transcription profiling of stress responses. The function of various stress response genes and mechanisms including the so-called SOS response are furthermore investigated in detail.
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