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| Content Provider | PubMed Central |
|---|---|
| Author | Beuchat, L. R. Pitt, J. I. |
| Abstract | The influences of glucose, sorbitol, and NaCl in a basal enumeration medium at water activities (aw) from 0.82 to 0.97 on colony formation by sublethally heat-stressed Wallemia sebi conidia were determined. Over this aw range, glucose and sorbitol had similar effects on recovery, whereas at an aw of 0.82 to 0.92, NaCl had a detrimental effect. Colony diameters were generally largest on media containing sorbitol and smallest on media containing NaCl. Maximum colony size and viable population of heat-stressed conidia were observed on media at an aw of ca. 0.92. When the recovery incubation temperature was 20 degrees C, the number of uninjured conidia detected at an aw of 0.82 was reduced compared with the number detected at 25 degrees C, while at 30 degrees C, the number recovered at an aw of 0.97 was reduced. The effect on heat-stressed conidia was magnified. This suggests that W. sebi conidia may be more tolerant of aw values higher than the optimum 0.92 when the incubation temperature is decreased from the near optimum of 25 degrees C and less tolerant of aw values greater than 0.92 when the incubation temperature is higher than 25 degrees C. The sensitivity of heat-stressed conidia increased as the pH of the recovery medium was decreased from 6.55 to 3.71. W. sebi conidia dispersed in wheat flour at aw values of 0.43 and 0.71 and stored for up to 65 days at both 1 and 25 degrees C neither lost viability nor underwent sublethal desiccation or temperature injury.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Starting Page | 2545 |
| File Format | |
| ISSN | 10985336 |
| e-ISSN | 10985336 |
| Journal | Applied and Environmental Microbiology |
| Issue Number | 8 |
| Volume Number | 56 |
| Language | English |
| Publisher Date | 1990-08-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Food Science Applied Microbiology and Biotechnology Biotechnology |
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