title: The extraction of guanosine 5'-diphosphate, 3'-diphosphate (ppGpp) from Escherichia coli using low pH reagents: a reevaluation.
mesh_terms: D004926:Escherichia coli / Q000032:analysis*; D006150:Guanine Nucleotides / Q000302:isolation & purification*; D006153:Guanosine Diphosphate / Q000302:isolation & purification*; D006159:Guanosine Tetraphosphate / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008722:Methods
chemical_list: D006150:Guanine Nucleotides; D007202:Indicators and Reagents; D006153:Guanosine Diphosphate; D006159:Guanosine Tetraphosphate