Figure 3.

Aging studies of PS in relevant conditions for cell culture. Photoluminescence spectra in the 250- to 480-nm range for fresh PS and PS aged in PBS for 1, 10, 100, and 1,000 min.

Punz√≥n-Quijorna et al. Nanoscale Research Letters 2012 7:396   doi:10.1186/1556-276X-7-396
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