Investigation of the effect of combined variations in temperature, pH, and NaCl concentration on nisin inhibition of Listeria monocytogenes and Staphylococcus aureus

Article Abstract:

The combined effect of low temperatures and high NaCl concentrations increases suppression by nisin of Streptococcus aureus. The bactericidal influence of nisin on Listeria monocytogenes, however, decreases with lower temperatures. High temperature and especially high NaCl concentrations increase the bactericidal effect of nisin on L. monocytogenes. The action of nisin against the organisms increases with a fall in pH between pH 7.92 and approximately pH 5. Nisin and NaCl at 20 and 25 degrees celsius at approximately pH between 4.5 to 5 have no action on the organisms.

Physiological aspects, Antibacterial agents, Staphylococcus aureus, Temperature

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Method for investigation of competition between bacteria as a function of three environmental factors varied simultaneously

Article Abstract:

Temperature, pH and the sodium chloride (NaCl) concentration affecting competition between microogranisms is investigated by selective replication from gradient plates. Pseudomonas putida inhibits Salmonella typhimurium at 20 and 23 degrees centigrade, but not at 30 and 35 degrees centigrade. P. putida does not grow when the pH and NaCl concentrations are extreme. The gradient plate technique is a screening tool for competition studies between organisms as a function of several environmental factors.

Environmental aspects, Bacteria

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Spatial interactions between subsurface bacterial colonies in a model system: a territory model describing the inhibition of Listeria monocytogenes by a nisin-producing lactic acid bacterium

Article Abstract:

The inhibition of organism Listeria monocytogenes by nisin-producing and nisin-non-producing Lactococcus lactis subspecies lactis was used to show spatial separation between subsurface bacterial colonies. The relative colony positions and bacterial growth of mixed populations can be observed using the model. A L. monocytogenes colony grew by 1.3 x 10(super)6 cfu when their separation distance was increased to 3000 micrometers.

Bacteriology, Bacterial cultures

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