Abstract : The purpose of the present study was to apply a modelling approach to define the growth rate and gr
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Abstract : The purpose of the present study was to apply a modelling approach to define the growth rate and growth/no growth interface of Byssochlamys fulva and Byssochlamys nivea on a synthetic medium as a function of temperature and water activity. Both fungal species were grown on malt extract agar at different temperatures (10 15 20 25 30 35 40 and 45 degrees C) and a(w) levels (0.88 0.90 0.92 0.94 0.96 and 0.99) for a period of 30 days. Growth responses were evaluated over time in terms of colony diameter changes. Growth data were fitted to the primary model of Baranyi and the resulting growth rates were further modeled as a function of temperature and water activity using the cardinal model with inflection (CMI) (Rosso et al. 1993). A logistic regression quadratic polynomial model was also employed to predict the probability of growth over storage time. Estimated parameters for minimum maximum and optimum temperatures for growth were 9.1 degrees C 46.4 degrees C and 32.1 degrees C for B. fulva and 10.5 degrees C 43.2 degrees C and 32.1 degrees C for B. nivea. The respective values for a(w) were 0.893 0.993 and 0.985 for B. fulva and 0.892 0.992 and 0.984 for B. nivea. No growth was observed at 0.88 a(w) regardless of temperature for both species whereas B. nivea ascospores could not grow at 10 and 45 degrees C irrespective of a(w). Regarding growth boundaries the degree of agreement between predictions and observations was gt98 concordant for both species. The erroneously predicted growth cases were 1.4-4.2 false positive and 2.1-3.5 false negative for B. nivea and B. fulva respectively. The developed logistic model was validated with two literature data sets as well as with data from independent experiments carried out on fruit juices. Validation results showed that agreement with literature data for growth was 25 out of 36 (69.4) cases whereas validation on fruit juice data failed in only 6 cases (5 false positives and 1 false negative) out of 128 cases.Copyright 2010 Elsevier Ltd. All rights reserved.PMID 20510780 PubMed - indexed for MEDLINEPublication Types MeSH Terms SubstancesPublication Types Research Support Non-U.S. GovtMeSH TermsByssochlamys/chemistryByssochlamys/growth amp development*Byssochlamys/metabolism*Culture Media/metabolismKineticsLogistic ModelsMicrobial ViabilityTemperatureWater/metabolism*SubstancesCulture MediaWaterLinkOut - more resourcesFull Text SourcesElsevier ScienceEBSCOOhioLINK Electronic Journal CenterSwets Information ServicesMedicalDrinking Water - MedlinePlus Health Information Supplemental Content Related citations Effect of temperature and water activity on growth and ochratoxin A production boundaries of two Aspergillus carbonarius isolates on a simulated grape juice medium. 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All links from this record Related Citations Calculated set of PubMed citations closely related to the selected article(s) retrieved using a word weight algorithm. Related articles are displayed in ranked order from most to least relevant with the “linked from” citation displayed first. Compound (MeSH Keyword) PubChem chemical compound records that are classified under the same Medical Subject Headings (MeSH) controlled vocabulary as the current articles. Substance (MeSH Keyword) PubChem chemical substance (submitted) records that are classified under the same Medical Subject Headings (MeSH) controlled vocabulary as the current articles. Recent activity Clear Turn Off Turn On Modelling the effect of temperature and water activity on the growth rate and gr... Modelling the effect of temperature and water activity on the growth rate and growth/no growth interface of Byssochlamys fulva and Byssochlamys nivea.Food Microbiol. 2010 Aug 27(5)618-27. Epub 2010 Mar 4 . 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