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. 2019 Mar 29;9:5355. doi: 10.1038/s41598-019-41797-8

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© The Author(s) 2019

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/.

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Images of the height of foam. The test tubes show the foam formed during H₂O₂-catalase reaction. Test tubes that formed well spread foam as shown in test tubes labeled 1–4 were measured in cm as illustrated in test tube labeled 3 (readings were taken at the bottom of the lower and upper meniscus). Test tubes that did not form a well spread foam as presented in test tube labeled C were not quantified.