320 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS % viability 1201• ...... .. 100 ' . .... 0 ' "" ..................... : ............. :" .......... ' .............. 0 0 0 0 II!-.no. uv treat. 'ment -[::]with UV t• eatm'ent. 48 hours Figure 1. Monolayer phototoxicity assay. STATISTICAL ANALYSIS A statistical analysis of the results from the monolayer and MatTek EPI-100 assays was done using the t-test to measure differences between irradiated and non-irradiated cul- tures. The cutoff for statistical significance was p -- 0.05. The results of the statistical analysis are presented in Table III. Phototoxicity in the yeast assay is not measured sta- tistically (2). % viability iI!n'o UV :treatment E3with UV treatment 48 hours Figure 2. MatTek EPI-100 phototoxicity assay.
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