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Characterisation of mixed microbial populations in white mineral dispersions
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Di Maiuta, Nicola (2010) Characterisation of mixed microbial populations in white mineral dispersions. PhD thesis, University of Warwick.
PDF (Nicola Di Maiuta thesis)
WRAP_THESIS_DiMaiuta_2010.pdf - Requires a PDF viewer. Download (4Mb) |
Official URL: http://webcat.warwick.ac.uk/record=b2338602~S15
Abstract
In recent years, the microbiology of white mineral dispersions and the application of
microbiocides for their preservation have taken a central role for the producer and
user with the aim of maintaining high quality requirements such as brightness,
rheological parameters, and odour neutrality. Additionally, new applications of
mineral dispersions set to open up markets in food, cosmetics and pharmaceutical
applications have aroused the interest in the microbiology of white mineral
dispersions. Due to the occurrence of biocide resistant bacteria, technical limitations
in the usage of biocides, as well as the more rigorous regulatory situation created by
the BPD, the demand for new biocide research to ensure continuing effective WMD
preservation is increasing. Despite efforts to optimise the application of
microbiocides for the storage and protection of mineral dispersions, costs for
preservation and disinfection are escalating. These are reasons why the current
preservation strategies have been revisited and new preservation strategies have been
designed.
The work described in this thesis demonstrates that the microbial diversity of
white mineral dispersions is greater than previously assumed and gives detailed
insight about the microbial diversity of mineral dispersions. The occurrence of
microbial contamination in mineral dispersions is of a seasonal nature rather than
manufacture site or product type specific. Furthermore, the incidence of biocideresistant
bacteria in mineral slurries is increasing and the microbial degradation
products of biocidal compounds are disadvantageous for dispersion stability (pH and
viscosity). New strategies for the preservation of mineral dispersions have been
developed and biocide performance against biocide-resistance bacteria has been
enhanced by combining in-use biocides with a range of non-biocidal additives.
The industrial application of these new findings contributes to a more efficient
preservation of white mineral dispersions with respect to both environmental as well
as financial resources and opens up a basis for alternative preservation strategies of
white mineral dispersions.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QH Natural history > QH301 Biology | ||||
Library of Congress Subject Headings (LCSH): | Microbiology, Mineralogy | ||||
Official Date: | April 2010 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Biological Sciences | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Dow, Crawford S. ; Norris, Paul R. ; Purdy, Kevin ; Schwarzentruber, Patrick | ||||
Sponsors: | Omya | ||||
Extent: | xix, 262 leaves :ill., charts | ||||
Language: | English |
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