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Evaluation of Microbial Growth and Survival on Construction Materials Treated with "Microbial Shield"

Absar Alum, Ph.D.
Department of Civil and Environmental Engineering
arizona State University
Tempe, AZ 85287-5306

Final Report Prepared for
Global Prevention Services

April 8, 2005

Table of Contents

Introduction

Material and Methods

Test Microorganisms

Test Material

Inoculation Strategy

Test Conditions

Microbial Growth and Viability Essay

RESULTS

Table 1. Culture media used for propagation and assay of test microorganisms

Figure1. Schematic representation of the coupons surface area

Figure 2. Untreated drywall sample inoculated with Penicillium mycelial pads

Figure 3. Treated drywall sample inoculated Penicillium mycelial pads

Figure 4. Untreated drywall sample inoculated Penicillium mycelial pads

Figure 5. E. coli recovered from test and control samples of drywall and wood samples after 24 hours incubation.

Figure 6. Percent area of samples covered with Penicillium and Stachybotrys growth

Figure 7. Percent area of samples covered with Penicillium and Stachybotrys growth

Figure 8. Viability of Penicillium and Stachybotrys spores on drywall and pinewood

Figure 9. Viability of Penicillium and Stachybotrys spores on drywall and pinewood

Figure 10. Survival of bacterial species on treated and non-treated wallboard

Figure 11. Survival of bacterial species on treated and non-treated pinewood

APPENDIX

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