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. 2017 Aug 21;7:8329. doi: 10.1038/s41598-017-08060-4

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© The Author(s) 2017

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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Schematic diagram of relationship between model variables based on biological mechanisms. The Ca/HEPES buffer model has eight variables: free B. bacteriovorus predators (BD _F), uninfected predation-susceptible K. pneumoniae prey (P _S), uninfected predation-resistant K. pneumoniae prey (P _R), prey with predator attached outside (PBD _O), invaded prey with predator on the inside (PBD _I), inactivated predator (BD _I), nutritious waste (W _N) and non-degradable waste (W _M). The serum model has an additional two variables serum growth resources (R) and serum antimicrobials (I). Detailed description of the biological mechanisms can be found in the supplementary materials.