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. 2019 Dec 20;104(4):1371–1382. doi: 10.1007/s00253-019-10314-2

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© The Author(s) 2019

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Fig. 2 — Simple method for immobilization of H. volcanii within the calcium alginate hydrogels. a Calcium alginate beads with encapsulated H. volcanii is formed instantaneously following the dropwise addition of resuspended H. volcanii cells in 4% sodium alginate solution into 1.5% CaCl₂ solution. b Formation of pink beads due to the presence of high carotenoid pigment confirms entrapment of H. volcanii within the calcium alginate beads