Materials Literature
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This paper reports the first single-crystal Raman spectra of substituted barium hexaferrites, BaFe12−2x MexCoxO19 (Me=Ir, Ti). The spectra were investigated in the 200–900 cm−1 range and are discussed in comparison with unsubstituted barium hexaferrite. Emphasis was placed on the different factors influencing the Rama…
We evaluated the relaxation enhancement and biodistribution of short- vs. long-circulating magnetoliposomes as a new contrast agent for magnetic resonance (MR) imaging of bone marrow. Magnetoliposomes with (ML-PEG) and without (ML) incorporation of polyethylene glycol (PEG, Mw 2000) were prepared, measuring 40 nm in d…
The thermodynamics and kinetics of the magnetic states of the semiconductor-like compound La0.7Sr0.3Mn0.7Co0.3O3 were studied by detailed magnetic measurements. The spontaneous magnetic state was found to be a cluster-glass phase which can cross over to a ferromagnetic state under an external magnetic field H. The def…
The effects of displacive, heavy-ion irradiation on the properties of synthetic single-crystals of ${\mathrm{ZrSiO}}_{4}$ (zircon), ${\mathrm{HfSiO}}_{4}$ (hafnon), tetragonal ${\mathrm{ThSiO}}_{4}$ (thorite), and monoclinic ${\mathrm{ThSiO}}_{4}$ (huttonite) have been investigated. All four $\mathrm{AB}{\mathrm{O}}_{…
Samples of Cu–Zn ferrites doped with different rare earth ions (La, Sm, Nd, Gd, and Dy) are investigated. X-ray diffraction patterns indicated the presence of a single spinel phase. The lattice parameter is found to be nearly independent of the doped rare earth ion type. The density is measured and the porosity is cal…
1. The objectives of the present work were: (a) to evaluate the effects of the development and the presence of a photosynthetically active algal biofilm on chemical fluxes and processes at the sediment–water interface; (b) to measure the effects of the biofilm on chemical concentration gradients in the bulk sediment;…
Biosynthesis of pyridoxal 5'-phosphate (PLP) depends upon the relatively specific action of two consecutive enzymes, viz. pyridoxal (pyridoxine, pyridoxamine) kinase and pyridoxine (pyridoxamine) phosphate oxidase. Less specific phosphatases catalyze hydrolyses of the 5'-phosphates of the vitamers pyridoxal, pyridoxam…
Abstract The development of high performance composites from a cheap natural fiber, jute, as reinforcement is particularly significant from an economic point of view. In this work, jute fiber‐unsaturated polyester(GP) composites having appreciable mechanical properties were prepared by using solution impregnation and…
Single crystal films of 4′-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) with excellent optical quality have been prepared by modified shear method. Electro-optic modulation for light propagating perpendicular to the film surface was measured at a wavelength (720 nm) where absorption is small. Very large elect…
Films of blends of microbial poly(3-hydroxybutyric acid) (PHB) with α-chitin and chitosan were prepared as completely biodegradable polyester-polysaccharide composites. DSC revealed that the crystallization of PHB in these blends is suppressed when the proportion of the polysaccharide is increased. The same tendency w…
The origin of the appearance of the morphotropic phase boundary in perovskite-type oxide solid solution systems is clarified on the basis of a Landau-type free-energy function expressed in terms of polarization and strain components. The dielectric susceptibilities and piezoelectric constants are shown to increase in…
A spin crossover transition (350 K, μeff=3.15 μB per Co atom; 4.5 K, μeff=0.70 μB per Co atom) and weak antiferromagnetic exchange (2 J=−11.7 cm−1) between the octahedral, doubly pyridazine bridged cobalt(II) ions are features of the structurally characterized complex [CoII2L(NCS)2(SCN)2] (the ligand L is shown).
Protein crystals have been cross-linked by a gentle technique whereby glutaraldehyde is introduced by vapor diffusion into the crystallization droplet containing the crystals. Diffraction analyses of crystals of three different proteins show that cross-linking prevents, in a large part, the lattice disorder normally o…
In this paper we discuss the nonequilibrium shear viscosity of a suspension of hard spheres that is modeled by neglecting hydrodynamic interactions in a consistent way. The aim is to establish the true capabilities of this model in predicting the properties of real suspensions. A Brownian dynamics algorithm is used to…
Article Nanoparticles and Nanostructured Films, Preparation, Characterization and Applications was published on February 1, 1999 in the journal Zeitschrift für Physikalische Chemie (volume 213, issue 2).
Polymers have been reinforced by nanophases for a long time. Nevertheless recent technological progress have allowed to put forward new materials, confirming the reinforcing effect of nanoparticles in polymer. They also emphasize the importance of three main parameters in these nanostructured systems : the mechanical…
The mucus used by the limpet Lottia limatula to form glue-like attachments was compared biochemically to the slippery mucus produced during other activities, such as suction adhesion. Colorimetric assays revealed the protein content of the adhesive mucus to be 2.1 times greater than that of the non-adhesive form, and…
The rational design of molecular photonic devices relies on the ability to select components with predictable electronic structure, excited state lifetimes and redox chemistry. Electronic communication in multiporphyrin arrays depends critically on the relative energies and electron density distributions of the fronti…
DNA replication initiator proteins bind site specifically to origin sites and in most cases participate in the early steps of unwinding the duplex. The papillomavirus preinitiation complex that assembles on the origin of replication is composed of proteins E1 and the activator protein E2. E2 is an ancillary factor tha…
Diatoms are unicellular organisms encased by silica‐based cell walls that display species‐specific structures. Morphogenesis of diatom cell walls is believed to be controlled by a polysaccharide/protein‐matrix that remains associated with mature cell walls. Recently, a family of calcium‐binding glycoproteins, the frus…