Materials Literature
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We report the first experimental demonstration that interface microstructure limits diffusive electrical spin injection efficiency across heteroepitaxial interfaces. A theoretical treatment shows that the suppression of spin injection due to interface defects follows directly from the contribution of the defect potent…
An ultrafast paralell data processor is described in which amplitude mode excitations of a charge density wave (CDW) are used to encode data on the surface of a 1-T TaS_2 crystal. The data are written, manipulated and read using parallel femtosecond laser pulse beams, and the operation of a database search algorithm i…
Experiments of Electron Spin Resonance (ESR) were performed on Co$% ^{2+}$ substituting Zn$^{2+}$ or Mg$^{2+}$ in powder samples of Zn$_2$(OH)PO$_4$ and Mg$_2$(OH)AsO$_4$. The observed resonances are described with a theoretical model that considers the departures from the two perfect structures. It is shown that the…
The electronic structure and total energy were calculated for ordered and disordered MgO-CaO solid solutions within the multiple scattering theory in real space and the local density approximation. Based on the dependence of the total energy on the unit cell volume the equilibrium lattice parameter and formation energ…
The development of functional materials with nanometer-scale architectures and the effect of these architectures on their chemical and physical properties are currently of great interest in materials design. Polymerizable lyotropic liquid crystal (LLC) assemblies provide a facile entry into this area by allowing one t…
A new class of epoxy nanocomposites with completely defined organic/inorganic phases was prepared by reacting octakis(glycidyldimethylsiloxy)octasilsesquioxane [(glydicylMe(2)SiOSiO(1.5))(8)] (OG) with diaminodiphenylmethane (DDM) at various compositional ratios. The effects of reaction curing conditions on nanostruct…
Introduction to particle synthesis, optical, and electronic properties solution-phase nanocluster synthesis and mechanisms of formation magic number metal clusters electrochemical synthesis of high aspect ratio gold particles template synthesis of metal nanostructures synthesis of metal nanoclusters using dendrimer te…
c-Myb and the C/EBP family are transcriptional regulatory factors that act in concert to regulate the expression of myeloid-specific genes. v-Myb encoded by avian myeloblastosis virus (AMV) is a mutated form of c-Myb that contains point mutations which disrupt the cooperation with C/EBPs. To understand the mechanism o…
Ocr, the product of gene 0.3 of bacteriophage T7, prevents the action of restriction endonucleases of the host bacteria. The amino-acid sequence of ocr has less than 20% similarity to any protein of known three-dimensional structure. Ocr has been crystallized in a number of different crystal forms and X-ray data for t…
The comparative X-ray absorption spectroscopy study of gadolinium and samarium bisporphyrinate complexes represented by the formulas Gd(III)H(oep)(tpp), Gd(III)(oep)(2), Gd(III)H(tpp)(2) and Sm(III)H(oep)(tpp), Sm(III)(oep)(2), Sm(III)H(tpp)(2) is reported. The XAFS spectra are recorded on the LURE-DCI storage ring (O…
Automation of protein crystallography synchrotron beamlines is becoming necessary to face challenging structural genomics projects. In this context, a program has been developed that processes diffraction frames using popular software but analyzes statistics and makes choices the way crystallographers usually do. This…
In order to elucidate the effect of stabilizing additives on the structure of proteins and the associated ordered water molecules in the hydration shell, the crystal structures of tetragonal lysozyme grown in the presence of sucrose, sorbitol and trehalose have been refined. Also refined are the structures of orthorho…
A data set from the metalloproteinase deuterolysin was collected at atomic resolution (1.0 A) with synchrotron radiation. The high resolution allowed the structure to be solved with the new direct-methods program ACORN using the coordinates of the Zn atom as a starting point. The phases obtained from ACORN were of suf…
Abstract Disproportionation of the liquid mixed anhydride dimethacrylic sebacic anhydride (m‐SA) to methacrylic anhydride and polyanhydride oligomers, as well as vinylic polymerization, can occur on workup and storage at room temperature. Dimethacrylic 1,3‐bis( p ‐carboxyphenoxy) propane, being a solid, can also dispr…
Abstract Electrospray ionization Fourier transform ion cyclotron resonance (ESI‐FTICR) mass spectrometry and matrix‐assisted laser desorption/ionization time‐of‐flight (MALDI‐TOF) mass spectrometry were applied to a complex silsesquioxane‐siloxane copolymer resin. The wide‐polydispersity starting material was fraction…
Patients suffering severe burns have an accelerated catabolism with a highly negative nitrogen balance that may worsen their prognosis. Somatropin treatment has been shown to improve this balance in different hypercatabolic situations. Moreover, in children with extensive burns it also reduces the healing time of the…
Abstract Photochemical reactions of aromatic azide groups were applied for a novel photosensitive silicone ladder polymer, that is, partially vinyl‐substituted polyphenylsilsesquioxane sensitized with aromatic bisazide compounds as a photocrosslinker. The photocrosslinking reaction in this system was investigated from…
The behavior of a quadruple compound, ${\mathrm{Ag}}_{3.4}{\mathrm{In}}_{3.7}{\mathrm{Sb}}_{76.4}{\mathrm{Te}}_{16.5},$ is investigated at various temperatures using the large Debye-Sherrer camera installed in BL02B2 at SPring-8, to elucidate its crystal structure. The low-temperature phase of this crystal has an $A7$…
The molecular structure of human uropepsin, an aspartic proteinase from the urine produced in the form of pepsinogen A in the gastric mucosa, has been determined by molecular replacement using human pepsin as the search model. Crystals belong to space group P2(1)2(1)2(1), with unit-cell parameters a = 50.99, b = 75.56…
A simple encapsulation technique is presented to produce highly phosphorescent, inert nanospheres that are suitable luminescent markers. It is based on the coprecipitation of phosphorescent ruthenium(II)-tris(polypyridyl) complexes and polyacrylonitrile (PAN) derivatives from a solution in N,N-dimethylformamide. The b…