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. 2021 Nov 8;11:21878. doi: 10.1038/s41598-021-01255-w

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Scanning Electron Microscopy Focused Ion Beam (SEM–FIB) of freeze-dried (FD) and spray-dried (SD) N. oceanica. Stabilization in carbon matrix and gold–palladium coating. (a) Granules correspond to individualized FD N. oceanica cells; (b) Granules correspond to clusters of more than one SD N. oceanica cell; (c) Individual FD N. oceanica cell; (d) SD N. oceanica cells cluster; (e) FD N. oceanica cell wall appearance detail; (f) SD N. oceanica cell walls appearance in detail; (g) SD N. oceanica fragmented granule; (h) SD N. oceanica granule surface in detail.