Theoretical calculations are performed to understand the electronic structure and magnetic properties of CuFe2Ge2. The band structure reveals large electron density N(EF) at the Fermi level suggesting a strong itinerant character of magnetism. The Fermi surface is dominated by two dimensional sheet like structures, with potentially strong nesting between them. The magnetic ground state appears ...

We examine the effectiveness of hydrogen passivation as a function of defect type and microstructure at grain boundaries (GBs) in multicrystalline silicon. We analyze a solar cell with alternating mm-wide bare and SiN.,-coated stripes us ing laser-beam-i nduced current, electron backscatter diffraction, X-ray fluorescence microscopy, and defect etching to correlate preand post-hydrogenation rec...

OBJECTIVE To evaluate the influence of the consumption of cow's milk on the risk of anemia during childhood in the city of São Paulo. METHODS We have studied a probabilistic sample (n=584) of underfive children living in the city of São Paulo, southeastern Brazil, between 1995 and 1996. Anemia (hemoglobin <11 g/dl) was diagnosed using capillary blood obtained by fingertip puncture. The cow's ...

An electron density map of trimethylamine dehydrogenase has been calculated at 6.0-A resolution. Protein phases were based on two isomorphous mercury derivatives with similar binding properties, and on anomalous scattering measurements. The map has been averaged about the noncrystallographic 2-fold axis, plotted on transparent sheets and used to construct a wooden model. The elipsoidal dimer ha...

Maria Daghofer,1,* Andrew Nicholson,2,3 and Adriana Moreo2,3 1IFW Dresden, P.O. Box 27 01 16, D-01171 Dresden, Germany 2Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA 3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 32831, USA (Received 15 February 2012; revised manuscript received 16 April 2012; p...

The optical and magneto-optical activities of yttrium iron garnet are shown to depend on the sintering stage. Low density yttrium iron garnet presents a lower optical activity than the high density garnet. The magneto-optical activity decreases at energies in which the optical transitions are associated to crystal field, indicating a relationship between the optical activity and the distortion ...

Surface reactivity and near-surface electronic properties of SrO-terminated SrTiO3 and iron doped SrTiO3 were studied with first principle methods. We have investigated the density of states (DOS) of bulk SrTiO3 and compared it to DOS of iron-doped SrTiO3 with different oxidation states of iron corresponding to varying oxygen vacancy content within the bulk material. The obtained bulk DOS was c...

Mineral properties in Earth's lower mantle are affected by iron electronic states, but representative pressures and temperatures have not yet been probed. Spin states of iron in lower-mantle ferropericlase have been measured up to 95 gigapascals and 2000 kelvin with x-ray emission in a laser-heated diamond cell. A gradual spin transition of iron occurs over a pressure-temperature range extendin...

The expression of the transcriptional regulatory protein LasR, a main component of the quorum-sensing (QS) system in Pseudomonas aeruginosa, was recently found to be sensitive to several environmental factors in addition to its dependency on cell density. However, the inherent effects of the different factors have seldom been separately demonstrated due to concurrent changes of culture conditio...

Human and rabbit red blood cells, separated into "young" and "old" age groups by differential flotation on phthalate esters, were fixed with glutaraldehyde and labeled with colloidal ferric oxide. Electron micrographs of thin sections of young cells showed a uniform and dense depostion of positive iron particles. Old cells showed particles deposited irregularly, leaving unlabeled gaps on the me...