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3 protocols using k2hpo4 3h2o

1

Synthetic Blood Fluid Composition

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Kokubo’s SBF was created based on a protocol developed for analysing apatite formation [42 (link)]. Reagents were mixed in in 3 L of distilled water in the following order: NaCl (Fisher Scientific) (24.105 g), NaHCO3 (Fisher Scientific) (1.065 g), KCl (Sigma) (0.675 g), K2HPO4·3H2O (0.693 g), MgCl2·6H2O (Fisher Scientific) (0.933 g) 1.0M HCl (117 mL), CaCl2 (Sigma) (0.876 g), Na2SO4 (Sigma) (0.216 g), Tris(hydroxymethyl)aminomethane (Tris) (Fisher Scientific) (18.354 g), 1.0M HCl (Fisher Scientific) (0–15 mL). Tris and HCl were added concurrently to maintain a pH of ~7.4.
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2

GAS Cell Morphology Visualization

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To visualize the morphology of GAS cells, bacteria from late stationary (overnight cultures) or exponential (4 hours of growth post 1:20 back-dilution of overnight culture in fresh medium) phase of growth were mixed by vortexing. 6 μl of each cell suspension was added to 1.5 μl dye mix composed of 60 μg/mL FM4–64 (Life Technologies Corporation), 10 μg/mL DAPI (Sigma Aldrich), and 2.5 μM SYTOX Green (Life Technologies Corporation) in 1X T-base (2 g (NH4)2SO4 [Fisher Scientific], 18.3 g K2HPO4 ⋅ 3H2O [Fisher Scientific], 6 g KH2PO4 [Fisher Scientific], 1 g C6H5O7Na3 ⋅ 2H2O [Fisher Scientific] per 1 L of ddH2O) and transferred onto an agarose pad (20% LB broth, 1% agarose [Fisher Scientific]). Samples were air-dried under a fume hood (care was taken to prevent over-drying). Cells were visualized on an Applied Precision DV Elite optical sectioning microscope equipped with a Photometrics CoolSNAP-HQ2 camera. Pictures were deconvolved using SoftWoRx v5.5.1 (Applied Precision). Images for figures were prepared using FIJI. Bacterial cell diameters from multiple pictures were quantified with CellProfiler (Kamentsky et al., 2011 (link)) on two separate occasions.
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3

GAS Cell Morphology Visualization

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To visualize the morphology of GAS cells, bacteria from late stationary (overnight cultures) or exponential (4 hours of growth post 1:20 back-dilution of overnight culture in fresh medium) phase of growth were mixed by vortexing. 6 μl of each cell suspension was added to 1.5 μl dye mix composed of 60 μg/mL FM4–64 (Life Technologies Corporation), 10 μg/mL DAPI (Sigma Aldrich), and 2.5 μM SYTOX Green (Life Technologies Corporation) in 1X T-base (2 g (NH4)2SO4 [Fisher Scientific], 18.3 g K2HPO4 ⋅ 3H2O [Fisher Scientific], 6 g KH2PO4 [Fisher Scientific], 1 g C6H5O7Na3 ⋅ 2H2O [Fisher Scientific] per 1 L of ddH2O) and transferred onto an agarose pad (20% LB broth, 1% agarose [Fisher Scientific]). Samples were air-dried under a fume hood (care was taken to prevent over-drying). Cells were visualized on an Applied Precision DV Elite optical sectioning microscope equipped with a Photometrics CoolSNAP-HQ2 camera. Pictures were deconvolved using SoftWoRx v5.5.1 (Applied Precision). Images for figures were prepared using FIJI. Bacterial cell diameters from multiple pictures were quantified with CellProfiler (Kamentsky et al., 2011 (link)) on two separate occasions.
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