| Autor: |
Sörqvist S; Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala. |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of applied bacteriology [J Appl Bacteriol] 1993 Apr; Vol. 74 (4), pp. 428-32. |
| DOI: |
10.1111/j.1365-2672.1993.tb05150.x |
| Abstrakt: |
Three strains of Listeria monocytogenes were heat-treated at three temperatures in physiological saline by a capillary tube method. Recovery of heat-treated bacteria was performed on blood agar and on tryptose phosphate agar with ferric citrate and aesculin (TPA-FE). Both media were used in two ways: (1) incubation at 37 degrees C for 7 d, and (2) preincubation at 4 degrees C for 5 d in order to obtain repair of heat-injured bacteria, followed by incubation at 37 degrees C for 7 d. D and z values were determined. In both incubation procedures, better average recovery was obtained on blood agar than on TPA-FE. Thus, higher D values were recorded when blood agar was used. In most cases the differences were statistically significant. Repair at 4 degrees C of heat-injured bacteria occurred on both media but the proportions of repaired bacteria were higher on blood agar. The repair on this medium was generally reflected in higher D values for preincubated samples. Some significant differences in heat resistance were noted between the strains. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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