title: Quantitative analysis of the elemental composition and the mass of bacterial polyphosphate bodies using STEM EDX.
abstract: The quantitative analysis of laboratory grown organisms (Plectonema boryanum and Staphylococcus aureus) revealed that a typical in vivo polyphosphate body (PPB) contains O (4.3 x 10(-8) microg), C (1.2 x 10(-8) microg), P (6.7 x 10(-9) microg), Mg (1.3 x 10(-9) microg), Ca (6.7 x 10(-10) microg), K (6.7 x 10(-10) microg), Fe (6.0 x 10(-10) microg), S (5.4 x 10(-10) microg) and Al (5.9 x 10(-10) microg). Quantitative X-ray analysis of samples from nature showed PPB contain O (1.63 x 10(-8) microg), C (4.75 x 10(-9) microg), P (2.50 x 10(-9) microg), Mg (5.0 x 10(-10) microg), Ca (2.50 x 10(-10) microg), K (2.50 x 10(-10) microg), Fe (2.25 x 10(-10) microg) and S (2.0 x 10(-10) microg). The mass of an average polyphosphate body was 6.7 x 10(-8) microg for P. boryanum, 2.5 x 10(-8) microg for S. aureus and for microbes from the natural environment 6.3 x 10(-8) microg. The results indicate that the PPB may have other unknown functions in addition to essential element storage, acting as a detoxification method by sequestering heavy metals and providing a homeostasis system in the cell.
authors.affiliation: Department of Biological Sciences, Lehman College, Bronx, New  York 10468, USA.
authors.forename: J
authors.initials: J
authors.lastname: Goldberg
authors.forename: H
authors.initials: H
authors.lastname: Gonzalez
authors.forename: T E
authors.initials: TE
authors.lastname: Jensen
authors.forename: W A
authors.initials: WA
authors.lastname: Corpe
mesh_terms: D001419:Bacteria / Q000737:chemistry*; D004577:Electron Probe Microanalysis / Q000379:methods; D002479:Inclusion Bodies / Q000737:chemistry; D011122:Polyphosphates / Q000032:analysis*
chemical_list: D011122:Polyphosphates