Materials Literature
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Patterns of N mineralization and P release were determined in two characteristic soils of the Andean-Patagonian Region (Andisol) and the transitional zone to the steppe (xeric Mollisol) amended with fish residues and biosolids. Residues were applied to the soils at rates of 10–20 g kg-1 and incubated for 112 d under c…
Methods developed originally to analyze domain motions from simulation [Proteins 27:425–437, 1997] are adapted and extended for the analysis of X-ray conformers and for proteins with more than two domains. The method can be applied as an automatic procedure to any case where more than one conformation is available. Th…
Sulfonated manganese(III) tetraphenylporphyrin supported on Amberlite IRA-900 ion exchange resin (MnTPPS-Ad) has been found to be a highly active and stable catalyst for olefin epoxidation and alkane hydroxylation by sodium periodate.
There has been a longstanding debate and controversy in the literature with regard to the determination by XPS of the exact oxidation state of a molybdenum species commonly observed in the passive films of stainless steel. In this paper we have compared both the XPS and ESR analyses of molybdenum oxyhydroxides previou…
We introduce a semischematic mode-coupling model to describe the slow dynamics in molecular liquids, retaining explicitly only the description of the center-of-mass degrees of freedom. Angular degrees of freedom are condensed in a $q$-vector independent coupling parameter. We compare the time and $q$ dependence of the…
The sintering behavior of Sr x Ba 1− x Nb 2 O 6 (SBN) ( x = 0.5, 0.6, and 0.7) was studied. The densification rate increased and the evaluated activation energy of SBN decreased as the Sr:Ba molar ratio increased. Also, when SBN50 (SBN where x = 0.5) was sintered at <1300°C, the densification rate decreased as the…
In Acetonitril wurde aus AsCl3 und Natriumphenolat zuerst Cl2AsOPh erzeugt, das dann mit PPh4Se5 und schließlich mit Na2Se zu PPh4[Se5AsSe] umgesetzt wurde. Mit Na2S anstelle von Na2Se wurde PPh4[AsSe6–xSx] erhalten, wobei der Schwefelgehalt mit höherer Reaktionstemperatur und -dauer zunimmt (x = 0,21 bis 1,09). Mit P…
CdS nanocrystals were prepared in chelate polymer microparticles, and characterizations of the CdS/polymer hybrids were performed by absorption microspectroscopy, optical microscopy, and transmission electron microscope measurements. When CdS nanocrystals were prepared by the reaction of Cd 2+ −polymer beads with a di…
It is shown that HOPG electrochemically intercalated by mixtures of sulfuric and formic acids exfoliates at room temperature, leading to “pneumatic” expanded products, in which CO bubbles are trapped between graphene layers sewn at their edges by oxygen bonds.
A new system of recycling expanded polystyrene has been developed which uses limonene orange oil as a solvent to recycle high grade polystyrene. Life cycle assessment was applied to this system to simulate its effect on the environment. It is shown that the new system has a lower greenhouse effect (−30%), acidificatio…
Absorption, excitation, emission spectra and lifetime measurements of cerium doped calcium metaphosphate glass in the concentration range 3.83x10 18 -6.34x10 20 ions cm -3 are investigated. The ultraviolet absorption spectra reflects the 4f→5d transitions where the 5d state is split into five levels due to the cubic c…
Consolidation and fracture dynamics in nanophase amorphous Si3N4 are investigated using 106‐atom molecular‐dynamics simulations. At a pressure of 15 GPa and 2000 K, the nanophase system is almost fully consolidated within a fraction of a nanosecond. The consolidation process is well‐described by the classical theory o…
The structure of silicon boride, ${\mathrm{SiB}}_{3},$ is based on 12-atom, boron-rich icosahedra in which silicon atoms substitute for some boron atoms. Raman bands associated with vibrations of icosahedral atoms in ${\mathrm{SiB}}_{3}$ are quite broad, reflecting this substitutional disorder. Comparing the Raman spe…
Coccolithophorids are marine unicellular algae characterized by their ability to carry out controlled, subcellular calcification. The biochemical and kinetic features of membrane‐bound Ca 2+ ‐stimulated ATPases have been examined. Membranes and organelles from axenic cultures of Pleurochrysis sp. (CCMP299) were isolat…
Human parathyroid hormone (hPTH) is involved in the regulation of the calcium level in blood. This hormone function is located in the NH2-terminal 34 amino acids of the 84-amino acid peptide hormone and is transduced via the adenylate cyclase and the phosphatidylinositol signaling pathways. It is well known that trunc…
Several plano-convex aluminum thin films, ~30 nm thick in the center and ~2 mm in diameter, were deposited on microscope cover slides to function as inverse-Gaussian transmittive filters. By placing one of these filters in front of the Gaussian He-Ne laser, we can modify the beam intensity profile in the downstream di…
Ferroelectric phase transition developing in a random field of static defects is studied by the computer simulation method. The chosen free energy provides the stability of the ferroelectric phase in the absence of defects. The simulation model takes into account the transformation-induced strain and the dipole—dipole…
A reaction‐plane model is used to examine the behavior of copper in aerated acid sulfate solution at or near the open‐circuit potential. The model predicts that when dissolved oxygen is present, the metal will corrode at a mixed potential determined by the and couples. The mixed potential in an aerated solution is neg…
The nematic orientation close to a solid substrate is investigated by means of a Landau--de Gennes phenomenological model. We show that a spatial variation of the scalar order parameter induces a subsurface variation of the average molecular orientation and an intrinsic contribution to the anchoring when the splay and…
Abstract Mono-15-crown-5-substituted bis(phthalocyaninato)lutetium was synthesized. By addition of potassium cation in solution, the phthalocyanine dimer radical formed a supramolecular structure which preserves two unpaired electrons and shows a ESR signal of a triplet state. From observed zero field splitting consta…