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Your search keyword '"Notermans, S."' showing total 45 results
Start Over Author "Notermans, S." Journal international journal of food microbiology
45 results on '"Notermans, S."'

23. Collaborative study on the use of motility enrichment on modified semisolid Rappaport-Vassiliadis medium for the detection of Salmonella from foods

Author

De Zutter, L., primary, De Smedt, J.M., additional, Abrams, R., additional, Beckers, H., additional, Catteau, M., additional, de Borchgrave, J., additional, Debevere, J., additional, Hoekstra, J., additional, Jonkers, F., additional, Lenges, J., additional, Notermans, S., additional, van Damme, L., additional, Vandermeersch, R., additional, Verbraeken, R., additional, and Waes, G., additional

Published
1991
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42. Characteristics of some psychrotrophic Bacillus cereus isolates.

Author

Dufrenne J, Bijwaard M, te Giffel M, Beumer R, and Notermans S

Subjects
Animals, Bacillus cereus drug effects, Bacillus cereus metabolism, Bacillus cereus physiology, Cold Temperature, Culture Media chemistry, Milk, Species Specificity, Spores, Bacterial drug effects, Spores, Bacterial growth & development, Bacillus cereus growth & development, Enterotoxins metabolism, Nisin pharmacology
Abstract

Twelve strains of Bacillus cereus isolated from different food products and foodborne disease outbreaks, and able to grow at temperatures < 7 degrees C, were characterised. Generation times at 7 degrees C varied from 9.4 h up to 75 h. Lag phase of the vegetative cells at 7 degrees C was strongly influenced by the previous temperature history of the cells. Preincubation at 37 degrees C increased the duration of the lag phase drastically. The heat resistance at 90 degrees C (D90 degrees C-values in min) for spores produced at 30 degrees C varied from 2.2 to 9.2 min for 11 strains. One strain, however, showed a D90 degrees C-value of > 100 min. Germination of spores in milk was delayed compared to those grown in brain heart infusion broth (BHI). All strains showed production of the diarrheal type enterotoxin in BHI. Addition of 50 IU of nisin to skim milk resulted in a decrease of numbers for 9 of the 12 strains tested. At a nisin concentration of 250 IU, a decrease in bacterial numbers was observed for all strains tested.

Published
1995
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43. Intervention strategies for Salmonella enteritidis in poultry flocks: a basic approach.

Author

van de Giessen AW, Ament AJ, and Notermans SH

Subjects
Animals, Eggs microbiology, Housing, Animal, Humans, Netherlands epidemiology, Poultry, Poultry Diseases epidemiology, Poultry Diseases etiology, Salmonella Infections, Animal epidemiology, Salmonella Infections, Animal etiology, Models, Biological, Poultry Diseases prevention & control, Salmonella Infections, Animal prevention & control, Salmonella enteritidis
Abstract

Poultry laying flocks can become infected with Salmonella enteritidis by several routes. In this study a model is presented of the cumulative infection curve of S. enteritidis in laying flocks. Based on this model and practical results the contribution of different routes to the infection can be estimated providing a basis for an effective intervention strategy. For illustration, the cumulative infection curve of S. enteritidis in Dutch laying flocks is analysed. This curve shows a low level of infection at the start of the laying period which indicates that the contribution of the vertical infection route (from infected breeding flocks to progeny) is small. The course of the infection curve indicates that there is a high probability of infection in the first part of the laying period. The result suggests that the laying flocks become infected mainly from the farm environment including not properly cleaned and disinfected poultry houses and infected vermin present on the farm. As a consequence, intervention in The Netherlands should be directed to trace S. enteritidis-contaminated laying farms and eradicate the contamination.

Published
1994
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44. Properties of Bacillus cereus spores in reference materials prepared from artificially contaminated spray dried milk.

Author

in 't Veld PH, Soentoro PS, and Notermans SH

Subjects
Animals, Bacillus cereus isolation & purification, Colony Count, Microbial, Culture Media standards, Hot Temperature, Muramidase pharmacology, Osmotic Fragility, Reference Standards, Regression Analysis, Spores, Bacterial drug effects, Spores, Bacterial growth & development, Time Factors, Bacillus cereus physiology, Food Microbiology standards, Milk microbiology
Abstract

A reference material for Bacillus cereus was developed based on spray drying of milk artificially contaminated with B. cereus spores. Various properties of the B. cereus spores in the milk powder were determined. The stability of the materials was good with no detectable decrease in the contamination level during 1 1/2 years storage at -20 degrees C or 4 weeks at 22, 30 or 37 degrees C. The homogeneity of the material was found acceptable for use as a reference material. Heat treatments (10 min at 70 or 80 degrees C) and addition of lysozyme to the enumeration medium did not influence the number of spores counted. The germination of the spores depended on the type of medium in which the milk powder was reconstituted, and on the storage period of the material. The suitability of the material was confirmed in a collaborative study. From the results obtained it was concluded that the material developed meets the general requirements set for reference materials and can therefore be used for, among others, testing laboratory performance.

Published
1993
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45. Effect of water activity on growth and enterotoxin D production of Staphylococcus aureus.

Author

Ewald S and Notermans S

Subjects
Staphylococcus aureus drug effects, Staphylococcus aureus metabolism, Enterotoxins biosynthesis, Staphylococcus aureus growth & development, Water pharmacology
Abstract

Four enterotoxin D-producing strains of Staphylococcus aureus, were cultured at 37 degrees C in brain heart infusion broth adjusted to various water activity (aw) levels by means of NaCl. For high cell inocula growth of all strains and enterotoxin D production were observed within 6 days at aw levels down to 0.86.

Published
1988
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