Dental amalgam and mercuryBiology of Metals - Tập 2 - Trang 25-30 - 1989
Ann Mari Aronsson, Birger Lind, Magnus Nylander, Monica Nordberg
Mercury concentration in intraoral air and urine of seven females with dental amalgam was measured before and after intake of one hard-boiled egg. A considerable decrease in mercury concentration in intraoral air was found. Twenty women with about equal dental amalgam status, with or without subjective symptoms related to dental amalgam, were also studied. Mercury concentrations in intraoral air a...... hiện toàn bộ
Analytical studies on the incorporation of aluminium in the cell walls of the marine diatom Stephanopyxis turrisBiology of Metals - Tập 26 - Trang 141-150 - 2012
Susanne Machill, Lydia Köhler, Susanne Ueberlein, René Hedrich, Marco Kunaschk, Silvia Paasch, Renate Schulze, Eike Brunner
The eukaryotic diatoms are unicellular algae. They are well known for their filigree micro- and nanostructured cell walls which mainly consist of amorphous silica as well as various organic compounds. However, diatoms are also known to incorporate certain amounts of aluminium into their cell walls. Unexpectedly, enhanced Al concentrations in the Southern Yellow Sea were found to be correlated with...... hiện toàn bộ
Point mutations change specificity and kinetics of metal uptake by ZupT from Escherichia coliBiology of Metals - Tập 23 - Trang 643-656 - 2010
Nadine Taudte, Gregor Grass
The ZIP (ZRT-, IRT-like Protein) protein ZupT from Escherichia coli is a transporter with a broad substrate range. Phenotypic and transport analysis showed that ZupT, in addition to Zn(II), Fe(II) and Co(II) uptake, is also involved in transport of Mn(II) and Cd(II). Competition experiments with other substrate cations suggested that ZupT has a slight preference for Zn(II) and kinetic parameters f...... hiện toàn bộ
XAS analysis of a nanostructured iron polysaccharide produced anaerobically by a strain of Klebsiella oxytocaBiology of Metals - Tập 25 - Trang 875-881 - 2012
Iztok Arčon, Oreste Piccolo, Stefano Paganelli, Franco Baldi
A strain of Klebsiella oxytoca, isolated from acid pyrite-mine drainage, characteristically produces a ferric hydrogel, consisting of branched heptasaccharide repeating units exopolysaccharide (EPS), with metal content of 36 wt%. The high content of iron in the EPS matrix cannot be explained by a simple ferric ion bond to the sugar skeleton. The bio-generated Fe–EPS is investigated by X-ray absorp...... hiện toàn bộ
Molecular analysis of iron transport in plant growth-promotingPseudomonas putida WCS358Biology of Metals - Tập 4 - Trang 36-40 - 1991
John Leong, Wilbert Bitter, Margot Koster, Vittorio Venturi, Peter J. Weisbeek
Root-colonizingPseudomonas putida WCS358 enhances growth of potato in part by producing under iron-limiting conditions a yellow-green, fluorescent siderophore designated pseudobactin 358. This siderophore efficiently complexes iron(III) in the rhizosphere, making it less available to certain endemic microorganisms, including phytopathogens, thus inhibiting their growth. At least 15 genes distribut...... hiện toàn bộ
Characterization of siderophore-mediated iron transport inGeotrichum candidum, a non-siderophore producerBiology of Metals - Tập 2 - Trang 209-213 - 1990
Henia Mor, Isaac Barash
Geotrichum candidum is capable of utilizing iron from hydroxamate siderophores of different structural classes. The relative rates of iron transport for ferrichrome, ferrichrysin, ferrioxamine B, fusigen, ferrichrome A, rhodotorulic acid, coprogen B, dimerium acid and ferrirhodin were 100%, 98%, 74%, 59%, 49%, 35%, 24%, 12% and 11% respectively. Ferrichrome, ferrichrysine and ferrichrome A inhibi...... hiện toàn bộ
The many “faces” of copper in medicine and treatmentBiology of Metals - Tập 27 - Trang 611-621 - 2014
Anna Hordyjewska, Łukasz Popiołek, Joanna Kocot
Copper (Cu) is an essential microelement found in all living organisms with the unique ability to adopt two different redox states—in the oxidized (Cu2+) and reduced (Cu+). It is required for survival and serves as an important catalytic cofactor in redox chemistry for proteins that carry out fundamental biological functions, important in growth and development. The deficit of copper can result in...... hiện toàn bộ