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Use of the Gompertz equation to model non-linear survival curves and predict temperature, pH, and sodium chloride effects for Listeria monocytogenes Scott A

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dc.contributor.authorLinton, Richard Howarden
dc.contributor.committeememberPierson, Merle D.en
dc.contributor.committeememberHackney, Cameron Rajen
dc.contributor.committeememberJohnson, Janet M.en
dc.contributor.committeememberMarcy, Joseph E.en
dc.contributor.departmentFood Science and Technologyen
dc.date.accessioned2014-03-14T20:12:48Zen
dc.date.adate2008-06-06en
dc.date.available2014-03-14T20:12:48Zen
dc.date.issued1994-05-05en
dc.date.rdate2008-06-06en
dc.date.sdate2008-06-06en
dc.description.abstractNumerous examples of non-linear survival curves, plotted as log surviving cells vs. time, for bacteria exposed to heat have been reported. Factors which may affect the shape of a survival curve and the heat resistance of bacteria include temperature, pH, and NaCl concentration. Many studies have examined the effect of these factors individually, but little information exists on the combined effects. The objective of this study was to mathematically model non-linear survival curves to account for these factors and their interactions simultaneously. Heat resistance of <u>Listeria monocytogenes</u>(L. <u>monocytogenes</u>) was determined in O.lM KH₂P0₄ buffer and in infant formula at three temperatures (50, 55, and 60 C), three pH levels (5, 6, and 7), and three NaCl concentrations (0, 2, 4%). Survival curves were fit using linear regression, non-linear regression with a modified logistic equation, and non-linear regression with a modified Gompertz equation.en
dc.description.degreePh. D.en
dc.format.extentxiii, 189 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06062008-164544en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06062008-164544/en
dc.identifier.urihttp://hdl.handle.net/10919/27971en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1994.L568.pdfen
dc.relation.isformatofOCLC# 31183715en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1994.L568en
dc.subject.lcshFood -- Microbiology -- Mathematical modelsen
dc.subject.lcshListeria monocytogenes -- Effect of temperature on -- Mathematical modelsen
dc.subject.lcshListeria monocytogenes -- Mortality -- Mathematical modelsen
dc.titleUse of the Gompertz equation to model non-linear survival curves and predict temperature, pH, and sodium chloride effects for Listeria monocytogenes Scott Aen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineFood Science and Technologyen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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