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Passage of Heme-Iron Across the Envelope of Staphylococcus aureus
Isd appears to act as an import apparatus that uses cell wall–anchored proteins to relay heme-iron across the bacterial envelope. Expand
Geochemical Evidence for Excess Iron in the Mantle Beneath Hawaii
Chemical interaction of Earth's mantle with the liquid outer core should influence the mantle's iron content. Osmium isotope ratios in Hawaiian lavas indicate a mass flux of ≤1% core to the mantle,Expand
Partitioning of Ru, Rh, Pd, Re, Ir, and Au between Cr-bearing spinel, olivine, pyroxene and silicate melts 1 1 Associate editor: C. R. Neal
A series of high temperature experiments was undertaken to study partitioning of several highly siderophile elements (HSE; Ru, Rh, Pd, Re, Os, Ir, Pt and Au) between Cr-rich spinel, olivine, pyroxeneExpand
Iron-Source Preference of Staphylococcus aureus Infections
Stable isotope labeling was applied to detect source-specific iron by mass spectrometry and show that Staphylococcus aureus preferentially imports heme iron over transferrin iron, indicating that hemeIron is the preferred iron source during the initiation of infection. Expand
Staphylococcus aureus IsdB Is a Hemoglobin Receptor Required for Heme Iron Utilization
It is demonstrated that staphylococci capture hemoglobin on the bacterial surface via IsdB and that inactivation of isdB, but not isdA or isdH, significantly decreases hemoglobin binding to the stapholococcal cell wall and impairs the ability of S. aureus to utilize hemoglobin as an iron source. Expand
186 Os^ 187 Os systematics of Gorgona Island komatiites: implications for early growth of the inner core
The presence of coupled enrichments in 186 Os/ 188 Os and 187 Os/ 188 Os in some mantle-derived materials reflects longterm elevation of Pt/Os and Re/Os relative to the primitive upper mantle. New OsExpand
Platinum group element fractionation in a komatiitic basalt lava lake
Precise PGE (Os, Ir, Ru, Pt, Pd) abundance data for bulk rock samples, and mineral separates, from a deep differentiated komatiitic basalt lava lake in the Vetreny Belt (Baltic Shield) were obtainedExpand
Potassium isotope cosmochemistry: Genetic implications of volatile element depletion
Abstract We report high precision (±0.5%o) potassium isotopic determinations on bulk chondrites, achondrites, and lunar samples, on a separated chondrule, and two CAls. We find that potassium shows aExpand
Experimentally determined mineral/melt partitioning of first-row transition elements (FRTE) during partial melting of peridotite at 3 GPa
Ratios of first-row transition elements (FRTE), such as Fe/Mn and Zn/Fe, may be fractionated differently by partial melting of peridotite than by partial melting of recycled lithologies likeExpand
Platinum group element geochemistry of komatiites from the Alexo and Pyke Hill areas, Ontario, Canada
Thirty-three whole-rock drill core samples and thirteen olivine, chromite, and sulfide separates from three differentiated komatiite lava flows at Alexo and Pyke Hill, Canada, were analyzed for PGEsExpand