Metabolomics Workbench : NIH Data Repository

MB Sample ID: SA218333

Local Sample ID:	SE_22
Subject ID:	SU002363
Subject Type:	Bacteria
Subject Species:	Staphylococcus epidermidis
Taxonomy ID:	1282
Genotype Strain:	Staphylococcus epidermidis 19N

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Treatment:

Treatment ID:	TR002375
Treatment Summary:	In this work, three pH transitions from pre-inoculum to inoculum were assayed. S. epidermidis pre-inoculums and the growth were performed at medium with pH 7.4, to mimic the blood pH; and pH 5.5, to mimic the skin pH. The pre-inoculum cellular density was adjusted to 0.06 (OD600) (aprox.1.5x108 CFU/mL) and used to inoculate fresh medium in the three conditions depicted in Figure 1, simulating S. epidermidis at skin and blood and a pH shock endured by S. epidermidis during the infection process from skin to blood transition. The cell cultures incubated at 37ºC with 225 rpm were followed by OD600 and recovered at mid-exponential phase for further analysis. Pre-inocula were prepared in TSB medium at pH 5.5 or 7.4. Inocula at pH 5.5 was used for the cultures grown at 5.5 (N55) and 7.4 (N57), and the inoculum at pH 7.4 for the culture at the same pH (N77). The cells were harvested at mid-exponential phase.

Treatment ID:

TR002375

Treatment Summary:

In this work, three pH transitions from pre-inoculum to inoculum were assayed. S. epidermidis pre-inoculums and the growth were performed at medium with pH 7.4, to mimic the blood pH; and pH 5.5, to mimic the skin pH. The pre-inoculum cellular density was adjusted to 0.06 (OD600) (aprox.1.5x108 CFU/mL) and used to inoculate fresh medium in the three conditions depicted in Figure 1, simulating S. epidermidis at skin and blood and a pH shock endured by S. epidermidis during the infection process from skin to blood transition. The cell cultures incubated at 37ºC with 225 rpm were followed by OD600 and recovered at mid-exponential phase for further analysis. Pre-inocula were prepared in TSB medium at pH 5.5 or 7.4. Inocula at pH 5.5 was used for the cultures grown at 5.5 (N55) and 7.4 (N57), and the inoculum at pH 7.4 for the culture at the same pH (N77). The cells were harvested at mid-exponential phase.