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4 results on '"Prime, D.C."'

1. A comparison of compacting and caking behavior of carbonate-based washing powders

Author

Leaper, M.C., Leach, V., Taylor, P.M., and Prime, D.C.

Abstract

Two types of sodium carbonate powder produced by spray drying (SD) and dry neutralization (DN) were studied for their compaction properties using a uniaxial compression tester. A comparison was also made with Persil washing powder. Dry neutralized sodium carbonate showed greater resistance to compression and also produced a weaker compact when compressed to 100 kPa. Spray-dried sodium carbonate had an absence of fine particles but compacted easily. Differential scanning calorimetry (DSC) showed that both types of powder were predominantly amorphous in nature. Moisture sorption measurements showed that both powders behaved in a similar way below 50% relative humidity (RH). However, dry neutralized sodium carbonate had a high moisture affinity above this RH. Particle structures were also examined using scanning electron microscopy, showing the heterogeneous interior of the spray-dried particles.

Published
2013

3. Morphological changes in Enterococcus faecium on exposure to Citrus essential oils in vapor phase as determined by TEM, SEM and AFM.

Author

Laird, K., Score, J., Prime, D.C., and Phillips, C.A.

Subjects
PHYSIOLOGICAL effects of essential oils, MORPHOLOGY, ENTEROCOCCUS faecium, CITRUS oils, TRANSMISSION electron microscopy, SCANNING electron microscopy, ATOMIC force microscopy, DEFORMATIONS (Mechanics)
Abstract

The antimicrobial effects of essential oils in vapor phase have been previously reported although the mechanism whereby they bring about their effect continues to be investigated. Morphological changes give some indication of the extent of the damage to cells brought about by exposure to essential oils and may provide a means of substantiating the physiological and biochemical changes that are integral to the antimicrobial effect. In this study, the morphological changes that occur during exposure of Enterococcusfaecium to a Citrus essential oil in vapor phase has been investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM). TEM shows membrane damage, vacuole formation and leakage of cytoplasmic material, SEM shows deformation of shape, whereas AFM, which gives the most information, confirms the deformation, which could be seen even after 15 minutes exposure using this method. [ABSTRACT FROM AUTHOR]

Published
2012
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4. Morphological changes in Enterococcus faeciumon exposure to Citrusessential oils in vapor phase as determined by TEM, SEM and AFM

Author

Laird, K., Score, J., Prime, D.C., and Phillips, C.A.

Abstract

The antimicrobial effects of essential oils in vapor phase have been previously reported although the mechanism whereby they bring about their effect continues to be investigated. Morphological changes give some indication of the extent of the damage to cells brought about by exposure to essential oils and may provide a means of substantiating the physiological and biochemical changes that are integral to the antimicrobial effect. In this study, the morphological changes that occur during exposure of Enterococcus faeciumto a Citrusessential oil in vapor phase has been investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM). TEM shows membrane damage, vacuole formation and leakage of cytoplasmic material, SEM shows deformation of shape, whereas AFM, which gives the most information, confirms the deformation, which could be seen even after 15 minutes exposure using this method.

Published
2012
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