Abstract:
AIMS:To study the relationship between changes in the composition of the outer membrane proteins and the survival of Salmonella typhimurium LT2 in filtered autoclaved seawater containing Toluidine Blue (TB) dye as a photosensitizer. METHODS AND RESULTS:In samples exposed to TB and excited by artificial visible light, the total viable (TVC) and respiring cell counts (RCC) showed that, although the TVC declined to an undetectable level in 6.5 h, the RCC showed that some cells were still capable of respiration. The porin protein composition changed gradually with OmpC and OmpF becoming undetectable by sodium dodecyl sulphate-polyacrylamide gel electrophoresis after 8 h of incubation. Hydrogen peroxide-pretreated cells survived longer compared with the control. CONCLUSIONS:Oxidative pretreatment of Salm. typhimurium protects cells from some of the effects of sunlight in the presence of photosensitizers. The changes in porin proteins may play a role in this protection. SIGNIFICANCE AND IMPACT OF THE STUDY:The study shows that the survival of bacteria under conditions of stress is the result of a linked series of reactions.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Ozkanca R,Sahin N,Isik K,Kariptas E,Flint KPdoi
10.1046/j.1365-2672.2002.01642.xsubject
Has Abstractpub_date
2002-01-01 00:00:00pages
1097-104issue
6eissn
1364-5072issn
1365-2672pii
1642journal_volume
92pub_type
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