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Chapter 3 As discussed in section 3.4.2 the density of cells recovered from the surfaces increased after 168 hour biofilm development. This trend was apparent for most strains examined. However the density of S. Enteritidis S09-0717 cells recovered from the 5 surface after 168 hours was much greater than the density of S09-0717 cells recovered from the 5 surface after 48 hours (p
Chapter 3 S. Enteritidis was a less dense biofilm former than strains of S. Agona and S. Enteritidis after 48 hours. Interestingly, had the S. Enteritidis strain been excluded from the work examining biofilm formation over the extended period of time it may have been assumed that only the S. Agona strain formed a significantly more dense biofilm on all 5 surfaces than the other strains of S. Agona and S. Typhimurium. This finding emphasises the importance of including multiple strains and serovars in biofilm studies. Furthermore, there may also be use in investigating the density of biofilm formed by multiple strains within each serovar. As clearly outlined in section 3.4.3 the S. Agona strain related to the outbreak S09-0494 formed a more dense biofilm than the S. Agona reference strain SL483 (p=0.004). This finding suggests that the sole use of only reference strains may be of limited use in biofilm related studies considering outbreak associated strains may form a significantly more dense biofilm. Previous authors have examined biofilm formation of multiple strains and serovars over an extended period of time using a microtitre plate based system [56, 197]. However, there are also limitations to the use of this method such as limited surface area. The use of the microtitre plate based method is discussed in further detail in chapter 5. Overall, the results presented in this chapter indicate that in most cases Salmonella biofilm density increases after an extended period of time. Korber and colleagues also found that S. Enteritidis biofilm increased marginally in thickness over an extended period of time (72 hours) using a flow cell device [102]. Similarly, Chorianopoulos also reported that the density of S. Enteritidis biofilm formation increased over 72 hours [148]. Mangalappalli-Illathu et al. also demonstrated S. Enteritis biofilm density increased over time (7 days) using a flow cell device [189]. These findings are broadly consistent with results presented here, although the extent of Page 110
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Salmonella enterica - biofilm forma
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Table of Contents Page Number 1.16.
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Table of Contents Page Number 4.1.2
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Table of Contents Page Number 6.8.4
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List of Abbreviations Table Page Nu
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List of Abbreviations List of Abbre
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Summary of Content Summary of Conte
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“To show your true ability is alw
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Acknowledgements ever met, Fiona th
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Acknowledgements This Ph.D. thesis
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Chapter 1 1.1. Salmonella Salmonell
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Chapter 1 may impose enormous costs
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Chapter 1 cracks or penetration of
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Chapter 1 detected by agglutination
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Chapter 1 become colonized with >10
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Chapter 1 antigens [z27],[z45] [1].
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Chapter 1 S. Agona has also been im
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Chapter 1 isolated from undercooked
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Chapter 1 The S. Typhimurium strain
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Chapter 1 ecosystem with the use of
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Chapter 1 [82]. Previous research h
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Chapter 1 to genes involved in flag
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Chapter 1 observation has also been
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Chapter 1 [119] and flow cell react
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Chapter 1 based disinfectant) the s
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Chapter 1 formation of two strains
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Chapter 1 shield the S. Agona cells
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Chapter 1 Key Objectives of this st
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Chapter 2 2. Abstract Food-borne pa
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Chapter 2 indicated that there may
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Chapter 2 taken from industrial set
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Chapter 2 2.1.4. CDC Biofilm Reacto
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Chapter 2 can be performed without
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Chapter 2 To summarise, previous au
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Chapter 2 2.3. Methods for examinin
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Chapter 2 and the biofilm formed th
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Chapter 2 2.4. Statistical Analysis
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Chapter 2 Table 2.1: Strain charact
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Chapter 2 XII. The gas port and med
Page 80 and 81: Chapter 2 II. Primary fixative cons
Page 82 and 83: Chapter 2 IX. Once the conditions w
Page 84 and 85: Chapter 2 Figure 2.1: Image of CBR
Page 86 and 87: Chapter 2 2.6. Results 2.6.1. Asses
Page 88 and 89: Chapter 2 2.6.3. SEM Analysis of su
Page 90 and 91: Chapter 2 Figure 2.6: Complete remo
Page 92 and 93: Chapter 2 2.6.5. Mean log 10 densit
Page 94 and 95: Chapter 2 2.6.6. Mean log 10 densit
Page 96 and 97: Chapter 2 Table 2.5: Mean log 10 de
Page 98 and 99: Chapter 2 The results displayed in
Page 100 and 101: Chapter 2 Table 2.7: Difference bet
Page 102 and 103: Chapter 2 Table 2.8: The mean log 1
Page 104 and 105: Chapter 2 Figure 2.7: Graph of the
Page 106 and 107: Chapter 2 also used “high” soni
Page 108 and 109: Chapter 2 2.8. Summary All 13 strai
Page 110 and 111: Chapter 3 3. Abstract It has been e
Page 112 and 113: Chapter 3 classified as persistent
Page 114 and 115: Chapter 3 was plated onto TSA for e
Page 116 and 117: Chapter 3 Figure 3.1: The mean log
Page 118 and 119: Chapter 3 Figure 3.3: SEM image of
Page 120 and 121: Chapter 3 Table 3.2: Difference bet
Page 122 and 123: Chapter 3 3.4.3. Intra-serovar vari
Page 124 and 125: Chapter 3 3.4.4. Strain variation i
Page 126 and 127: Chapter 3 3.4.5. The density of bio
Page 128 and 129: Chapter 3 3.5. Discussion As illust
Page 132 and 133: Chapter 3 increased biofilm appeare
Page 134 and 135: Chapter 4 Examining the efficacy of
Page 136 and 137: Chapter 4 through laboratory based
Page 138 and 139: Chapter 4 acid and quaternary ammon
Page 140 and 141: Chapter 4 the surface the temperatu
Page 142 and 143: Chapter 4 availability of multiple
Page 144 and 145: Chapter 4 peracetic acid (100, 200,
Page 146 and 147: Chapter 4 As discussed previously,
Page 148 and 149: Chapter 4 Dey/Engley (Difco) neutra
Page 150 and 151: Chapter 4 sterilisation was achieve
Page 152 and 153: Chapter 4 IX. Aliquots of 100µl of
Page 154 and 155: Chapter 4 XV. XVI. XVII. XVIII. XIX
Page 156 and 157: Chapter 4 4.3. Results 4.3.1. Suspe
Page 158 and 159: Chapter 4 Table 4.3: Mean log 10 de
Page 160 and 161: Chapter 4 Benzalkonium chloride was
Page 162 and 163: Chapter 4 4.4. Discussion Suspensio
Page 164 and 165: Chapter 4 effective at eliminating
Page 166 and 167: Chapter 4 Surprisingly, Nguyen et a
Page 168 and 169: Chapter 4 though a contact time of
Page 170 and 171: Chapter 4 provide a more standardis
Page 172 and 173: Chapter 4 hours instead of the stan
Page 174 and 175: Chapter 5 5. Abstract Examining bio
Page 176 and 177: Chapter 5 dry and rough (bdar) morp
Page 178 and 179: Chapter 5 absence of curli and cell
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Chapter 5 studies such as the micro
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Chapter 5 discussed in chapter 4. T
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Chapter 5 5.2. Methods 5.2.1. Colon
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Chapter 5 XIII. XIV. XV. XVI. XVII.
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Chapter 5 XVI. XVII. XVIII. XIX. XX
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Chapter 5 5.3.2. Repeatability of m
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Chapter 5 Figure 5.2: Stained biofi
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Chapter 5 was formed at room temper
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Chapter 5 Table 5.3: The density of
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Chapter 5 5.3.4. The density of bio
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Chapter 5 Table 5.6: The difference
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Chapter 5 Table 5.7: The difference
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Chapter 5 Table 5.8: Summary of ass
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Chapter 5 interpretation therefore
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Chapter 5 measures of S. enterica b
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Chapter 5 cells peaks [165, 191]. D
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Chapter 5 5.5. Limitations of the s
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Chapter 6 Discussion of S. enterica
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Chapter 6 However, a number of auth
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Chapter 6 It is of interest to exam
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Chapter 6 were similar at 48 hours.
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Chapter 6 attributable to a small n
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Chapter 6 chosen as an appropriate
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Chapter 6 undetermined. However, th
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Chapter 6 reason for this may be du
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Chapter 6 Moreover, based on the re
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Chapter 6 responsible for increased
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Chapter 6 not fully capture the ran
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Chapter 6 However, the extent of bi
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Chapter 6 6.10. Conclusions and rec
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Chapter 6 studies may solve some of
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Bibliography Bibliography Page 221
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Bibliography 12. T. Takata, J.L., H
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Bibliography 29. Barker, J., M. Nae
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Bibliography 47. Threlfall, E.J., H
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Bibliography 65. CDC. Investigation
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Bibliography 83. Ledeboer, N., Frye
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Bibliography 100. Chia, T., Goulter
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Bibliography 117. Buckingham-Meyer,
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Bibliography 133. European Committe
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Bibliography Supernatant of a Hafni
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Bibliography 165. Díez-García, M.
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Bibliography cultivation of Staphyl
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Bibliography Compounds. 2012. Appli
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Bibliography 215. Buck, et al., A q
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Bibliography Canadian Journal of Ps
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Appendix 1 Appendix 1— List of Re
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Appendix 1 Appendix 1 - List of Equ
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Appendix 2 Colour index High outlie
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Appendix 3 Appendix 3-Figure 2: PFG
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Appendix 4 Poster Presentation Envi
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