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. 2019 Aug 20;13:70. doi: 10.1186/s13036-019-0202-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — Using the Parabola Principle to design visible qualitative Hg (II) biosensors. a Parabola of the merR biosensors incubated with 0.25 μmol/L of Hg (II). b The performance of biosensor P429-merR in ultrapure water, natural lake water, and polluted water. c Naked eye observation of biosensor P429-merR incubated with Hg (II) solutions