Materials Literature
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We report the first measurement of giant magnetoresistance at 10 GHz in a bulk ceramic sample of Nd 0.7 Sr 0.3 MnO 3 . From the surface resistance data, we deduce that the magnetoresistance, [ϱ μW (0)−ϱ μW ( B )]/ϱ μW (0) at 1.2 T, has a peak value of approximately 90% at 215 K. The microwave studies are supplemented…
Simple complementation assay systems were developed for the substrate-specific proteins PB of glycine reductase, sarcosine reductase, and betaine reductase, in which acetyl phosphate was detected as the product in all three cases. The betaine-specific subunits of protein B (PB betaine) responsible for betaine reductas…
Hexacyanometalates [BIII(CN)6)]3- react with Lewis acids [AL]2+ or A2+ to give either oligonuclear complexes with high-spin ground states [BIII(CN-AIIL)6)]9+ or three-dimensional (3D) networks with variable Curie temperature TC. We report the magnetic properties of (i) an heptanuclenr complex [Cr(CN-Ni(tetren)6](ClO4)…
Silicon clusters have been generated by CO2-laser-induced decomposition of SiH4 in a flow reactor. By introducing a conical nozzle into the reaction zone, they are extracted into a molecular beam apparatus and analyzed with a time-of-flight mass spectrometer. The mass spectra show that the cluster source emits, beside…
New experiments on a well known compound, a dodecanuclear manganese cluster of formula [Mn12O12(CH3COO)16(H2O)4, are providing very exciting results. Recently this cluster was shown to have a huge magnetic anisotropy of the Ising type which, associated to the large spin of the ground state, S=10, is responsible of an…
Escherichia coli galactoside acetyltransferase (GAT) is a member of a large family of acetyltransferases that O-acetylate dissimilar substrates but share limited sequence homology. Steady-state kinetic analysis of over-expressed GAT demonstrated that it accepted a range of substrates, including glucosides and lactosid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Electrically Conducting Polyester That Has Isolated Quatrathiophene Units in the Main ChainYaoliang Hong and Larry L. MillerCite this: Chem. Mater. 1995, 7, 11, 1999–2000Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEuropium Pyridinethiolates: Synthesis, Structure, and ThermolysisM. Berardini and J. BrennanCite this: Inorg. Chem. 1995, 34, 24, 6179–6185Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1995https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, Reactivity and Molecular Structures of RSRS-[Ni(tmc)SC6H5](PF6), RRSS-[Ni(tmc)SC6H5](CF3SO3) and RRSS-[Ni(tmc)](CF3SO3) (tmc = 1,4,8,11-Tetramethyl-1,4,8,11-tetraazacyclotetradecane)M. S. Ram, Charles G. Riordan, Robert Ostrander, and Arnold L. RheingoldCite this:…
Single‐phase yttrium phosphate (YPO 4 ) and a YPO 4 /yttrium aluminate (Y 3 Al 5 O 12 ) laminate were studied. Young's modulus, Poisson's ratio, Vickers hardness, and coefficient of thermal expansion of YPO 4 sintered bodies were measured. YPO 4 and Y 3 Al 5 O 12 are chemically compatible and morphologically stable up…
The ground state of the neutral vacancy in diamond is diamagnetic and therefore has not been studied by electron paramagnetic resonance (EPR). We report the observation of EPR from the $^{5}$${\mathit{A}}_{2}$ excited state of the neutral vacancy by EPR when illuminating an electron-irradiated natural IaB diamond with…
Orientational dynamics in a simple model of infinitely thin hard needles, initially proposed by Rubinstein and Obukhov [1], are investigated by molecular dynamics simulations. The center-of-mass coordinates of the needles are fixed on a regular fcc lattice. The statics of the system is analytically known, yielding a g…
Abstract Two series of triblock copolymers of poly(ethylene glycol) (PEG, number‐average molecular weight M n = 6000) and poly( L ‐lactide) (PLLA) or poly( D ‐lactide) (PDLA) were prepared by ring‐opening polymerization of lactide initiated by PEG end groups using stannous octoate as a catalyst, either in refluxing to…
Abstract This study reports on the progression of processes occurring in polymer blends during mixing. For the polymer pellet blends studied, an abrupt phase inversion was observed simultaneous with attainment of maximum torque in the batch mixer. A four‐step phase inversion mechanism is described as predominant where…
Extended dendritic, ladder, and cross‐linked polyradical frameworks empolying π‐conjugated backbones (e.g. see Fig.) show promise in the development of ferromagnetic polymers. Recent progress in this field is reviewed and the various classes of materials, for example polyacetylene‐, or polyphenylenevinylene‐based radi…
Anisotropic charge transport, or polarized photo‐ and electroluminescence are possible applications for materials combining the optical properties of arylenevinylene polymers with the characteristic orientational order of the liquid‐crystalline state. Thermally stale, soluble materials with a broad mesophase, which ca…
We preesnt a theory for the effect of polymer nonideality on the phase behavior of a hard-sphere colloid plus nonadsorbing polymer mixture. Starting from the behavior at the \ensuremath{\theta} temperature, which has been treated previously within a mean-field framework [H. N. W. Lekkerkerker et al., Europhys. Lett. 2…
We present results for sonoluminescent (SL) radiation from a strongly modulated air bubble in water. The SL pulse is due to high temperatures in the bubble that are produced by the collapse of a shock wave. The dependence of SL radiation on acoustic pressure and initial bubble size is discussed, as well as the inclusi…
The properties of magnetic solids constructed from cyanometalate building blocks are reviewed. Most of these solids adopt face-centered cubic lattices in which adjacent metal centers are linked by CN bridges; they are analogues of the long-known inorganic coordination polymer Prussian blue. Ferromagnets, ferrimagnets,…
Dysprosium‐doped glasses were prepared in the system of gallium‐based sulfide, tellurite, zirconium‐baed and indium‐based fluorides and their optical properties were studied. From the absorption cross sections of five f‐f bands, three Judd‐Ofelt parameters, ω t ( t = 2, 4, 6), of Dy 3+ ion were determined. The composi…