Characterization of commercial yeast strains by flow microcalorimetry

Perry, B. F.; Beezer, Anthony E.; Milès, Roger

doi:10.1111/j.1365-2672.1983.tb02605.x

Cited by 15 publications

(5 citation statements)

References 11 publications

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“…Furthermore, it offers advantages compared with plating methods, such as speed and automation 2. However, due to a limited understanding of the relationship between the heat changes recorded by calorimetry and microbial growth and metabolic reactions, isothermal calorimetry had, until recently, only seen limited use 3. It has now been demonstrated, however, that calorimetric traces can be split into growth and metabolic thermal components in a variety of organisms and that related plate count parameters can be matched to the calorimetric signals 4…”

Section: Introductionmentioning

confidence: 99%

Optimisation of production and storage stability of the starter bacteria Streptococcus thermophilus and Lactobacillus plantarum

et al. 2007

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The growth of Lactobacillus plantarum and Streptococcus thermophilus was modelled by fitting isothermal calorimetric traces to arbitrary mathematical functions. There was a correlation between certain features on the thermal trace and parameters derived from a Baranyi fit to viable count data. In the presence of 75 g L −1 lactose, S. thermophilus showed a slower rate of growth than in the presence of 5 g L −1 lactose when measured by both viable count and heat flow. A simple equation described the variation in glass transition temperature with water activity for all preparations. A master curve fit for all mortality data for S. thermophilus showed the importance of a transition temperature for the survival of freeze-dried preparations of bacteria. The temperature at which survival began to be impaired was 15-20• C below the glass transition temperature determined by differential scanning calorimetry.

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Section: Introductionmentioning

confidence: 99%

Optimisation of production and storage stability of the starter bacteria Streptococcus thermophilus and Lactobacillus plantarum

et al. 2007

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“…Recently several automatic methods have been proposed to provide different objectives: to minimize the number of individual tests, to avoid subjective interpretations, and to reduce the time required to obtain a definitive identification. Microcalorimetry is a useful technique for this purpose (Russell et al 1975;Perry et al 1983).…”

Section: Introductionmentioning

confidence: 99%

“…These thermal profiles have been repeatedly proposed as a potential taxonomic tool (Boling et a1 . 1973;Russell et al 1975; Monk and Wadso 1975;Beezer et al 1976;Ljungholm et al 1976;Newel1 1980;Herman et al 1980;Perry et al 1983).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of microcalorimetric curves for bacterial identification

López¹,

Viñas²,

Lorén³

et al. 1987

Can. J. Microbiol.

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A numeric method is suggested for the treatment of microcalorimetric curves of bacterial growth to provide a new tool for their automatic identification. In this method the microcalorimetric curves are searched against certain reference profiles (stored in a library) by means of a cross-correlation analysis and a parametric comparison. The matching between the new curve and each reference profile is evaluated by means of a specific identification coefficient which provides an objective criterion for the identification of each species. The reliability of the method is discussed.

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“…Many of them concern fundamental studies of yeast cells, especially Saccaromyces cerevisiae (e.g. Perry et al 1983;lz et al 1993). Effects of toxic substances is another field with several publications (e.g.…”

Section: Introductionmentioning

confidence: 99%

Microcalorimetric Characterization of the Recovery of a Brown-Rot Fungus after Exposures to High and Low Temperature, Oxygen Depletion, and Drying

Xie¹,

Bjurman²,

Wadsö

1997

HFSG

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Rot fungi found in the exterior panelling of buildings must be able to withstand very varying conditions of temperature and moisture. In this study we have exposed wood samples with the brown-rot fungus Gloeophyllum scpiarium, often found in exterior panelling, to high and low temperatures, oxygen depletion, and drying. The activity of the fungi before and after the exposures was monitored by isothermal m icrocalori metry at 25 °C in order to assess the rate and level of recovery. The activity of the fungus was not greatly influenced by exposures (o 6, 37 and 45 °C. Higher temperatures (55 and 60°C) resulted in an initial period of low activity followed after 20-1 OOh by a recovery back to approximately the prc-exposure level. After Ih exposure to 65 °C no activity could be detected so the lethal temperature for this fungus is in the range of 60-65 °C. Low temperatures (-23 °C) resulted in reduced activity during 10-20h. The activity of the fungus decreased in closed vessels as a result of an increased concentration of carbon dioxide. When fresh air was admitted the activity wenl back to the level before the exposure. Wetting after drying returned the activity to the level it had before the drying.

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Characterization of commercial yeast strains by flow microcalorimetry

Cited by 15 publications

References 11 publications

Optimisation of production and storage stability of the starter bacteria Streptococcus thermophilus and Lactobacillus plantarum

Optimisation of production and storage stability of the starter bacteria Streptococcus thermophilus and Lactobacillus plantarum

Analysis of microcalorimetric curves for bacterial identification

Microcalorimetric Characterization of the Recovery of a Brown-Rot Fungus after Exposures to High and Low Temperature, Oxygen Depletion, and Drying

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