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. 2018 Apr 3;8:5484. doi: 10.1038/s41598-018-23928-9

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Current noise spectra of diatoms. The spectral power density, S_I, is presented as a function of frequency, f. The red and black current traces are reproduced from the recording presented in Fig. 2. The red trace shows the random weak and sporadic signals at the beginning, and the black trace the quasi-periodic signals of the end of the recording. The noise accordingly changes from 1/f flicker noise, to diffusion limited 1/f^1.5 noise.