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. 2013 Jul 5;13(7):8640–8668. doi: 10.3390/s130708640

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 9. — Cross-section of sensing film for BOD determination. Layer 1 is polycarbonate cover; Layer 2 is yeast immobilized in PVA; Layer 3 is charcoal acting as an optical isolator; Layer 4 is oxygen sensitive fluorescent layer; Layer 5 is inert and gas to impermeable polyester support (adapted from [85]).