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Titolo:
Temperature shock, injury and transient sensitivity to nisin in Gram negatives
Autore:
Boziaris, IS; Adams, MR;
Indirizzi:
Univ Surrey, Sch Biomed & Life Sci, Surrey GU2 7XH, England Univ Surrey Surrey England GU2 7XH d & Life Sci, Surrey GU2 7XH, England
Titolo Testata:
JOURNAL OF APPLIED MICROBIOLOGY
fascicolo: 4, volume: 91, anno: 2001,
pagine: 715 - 724
SICI:
1364-5072(200110)91:4<715:TSIATS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
OUTER-MEMBRANE PERMEABILITY; CELL-SURFACE HYDROPHOBICITY; MONOCYTOGENES SCOTT-A; ESCHERICHIA-COLI; BACTERIA; RESISTANCE; MICROORGANISMS; INACTIVATION; PRESSURE; BARRIER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Adams, MR Univ Surrey, Sch Biomed & Life Sci, Surrey GU2 7XH, England UnivSurrey Surrey England GU2 7XH ci, Surrey GU2 7XH, England
Citazione:
I.S. Boziaris e M.R. Adams, "Temperature shock, injury and transient sensitivity to nisin in Gram negatives", J APPL MICR, 91(4), 2001, pp. 715-724

Abstract

Aims: The effect of thermal stresses on survival, injury and nisin sensitivity was investigated in Salmonella Enteritidis PT4, PT7 and Pseudomonas aeruginosa. Methods and Results: Heating at 55 degreesC, rapid chilling to 0.5 degreesC or freezing at -20 degreesC produced transient sensitivity to nisin. Cells were only sensitive if nisin was present during stress. Resistance recovered rapidly afterwards, though some cells displayed residual injury. Injurywas assessed by SDS sensitivity, hydrophobicity changes, lipopolysaccharide release and NPN uptake. LPS release and hydrophobicity were not always associated with transient nisin sensitivity. Uptake of NPN correlated better but persisted longer after treatment. Conclusions: Thermal shocks produce transient injury to the outer membrane, allowing nisin access. After treatment, the permeability barrier is rapidly restored by a process apparently involving reorganization rather than biosynthetic repair. Significance and Impact of the Study: Inclusion of nisin during food treatments that impose sub-lethal stress on Gram negatives could increase process lethality, enhancing microbiological safety and stability.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 10:45:27