Materials Literature
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Pr 1−x Na x MnO 3 solid solutions up to x=0.25 were prepared. Irrespective of magnetic order all samples are electrically insulating. The Curie temperature is maximum at TC=125 K for x=0.15; the samples with x⩾0.2 are charge-ordered antiferromagnets. The x=0.2 antiferromagnetic charge-ordered insulator (AFCO) can be s…
This work deals with a method of analysis which estimates the increase of core losses under sinusoidal and nonsinusoidal inductions. The estimation can be carried out by correlating instantaneous magnetization power (P/sub M/) or the instantaneous magnetic field (H) as a function of the magnetization rate (dB/dt) and…
Anionic self-condensing vinyl polymerization is achieved from an in situ creation of a vinyl monomer bearing an active anion by the reaction of equimolar amount of 1,3-diisopropenylbenzene (DIPB) and butyllithium in THF at 30°C. Onset of the intermolecular-equilibrium between isopropenyl groups (α-methylstyrene) and i…
The abrasion resistance of different wool and blended fabrics is measured with the Martindale wear and abrasion tester, the abrasion kinetics is identified by the shape of the mass loss curve versus abrasion cycles up to yarn breakage. A concave kinetic curve shows a low initial weight loss rate, which continues to in…
To construct an artificial photosynthetic system, peptide dendrimers [n-(X-HLY)PAMAMs: X = R, E; Y= L, F; n=4, 8, 16, 32 and 64 segments], in which amphiphilic alpha-helix peptides (X-HLY: R-HLL, E-HLL and R-HLF) were introduced at the end groups of polyamidoamine dendrimers (PAMAMs), were designed and synthesized. Th…
The de Haas-van Alphen effect in quasi-two-dimensional metals is studied at arbitrary parameters. Oscillations of the chemical potential can substantially change the temperature dependence of harmonic amplitudes that is commonly used to determine the effective electron mass. The processing of the experimental data usi…
The protonic conductivities of SrZr 0.95 M 0.05 O 3 doped with four acceptor ions (M 3+ =Y 3+ , Sc 3+ , Yb 3+ , Er 3+ ) have been studied in the single crystal form. The protonic conductivity is found in four acceptor ions, indicating that protons migrate by hopping from site to site. The Yb-doped crystal has the lowe…
We report the use of the electron-donating 4,5-dipentyl-4'-methyl-TTF (TTF = tetrathiafulvalene) moiety in combination with the electron acceptor 11,11,12,12-tetracyanoanthraquinodimethane (TCNAQ) unit in the novel D-sigma-A diad molecules 11, 17, and 18. These compounds display a weak, broad, low-energy intramolecula…
The interaction of O 2 with Fe supported on zeolite MFI has been investigated by the in situ UV Raman technique. Previously, the formation of adsorbed superoxide ions, O 2 -, on the Fe/MFI prepared by sublimation of FeCl 3 vapor onto HMFI, was identified by ESR at 77 K. In situ Raman data indicate that adsorbed peroxi…
A putative regulatory protein, PhaR, which was identified in the polyhydroxyalkanoic acid synthetic locus (phaZCPR) in Paracoccus denitrificans, was investigated. The PhaR protein purified from a recombinant Escherichia coli was estimated to be 22 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, being…
Two novel diazamesocyclic ligands based on l,5-diazacyclooctane (DACO) and functionalized with additional pyridyl donor groups, namely 1,5-bis(2-pyridylmethyl)-1,5-diazacyclooctane (L1) and 1-(2-pyridylmethyl)-1,5-diazacyclooctane (L2), have been synthesized and characterized, as have their CuII complexes. Crystal str…
The electronic structures of several magnetic semiconductors were calculated using first-principles based electronic structure techniques. Calculations were performed both for periodic supercells and for disordered systems which were treated within the coherent potential approximation. Our results differ from the conv…
Silicate layers cross-linked by interlayer VO5 square pyramids form the basis of the three-dimensional frameworks of the structures of the title compounds (the structure of K2(VO)(Si4O10)⋅H2O is depicted). Alkali metal cations (•) and water molecules (○) occupy nonframework sites in these structures, which were synthe…
We study the hydrogenic impurity in a quantum dot (QD). We employ the effective mass theory with realistic barrier and variable effective mass. The model is simple, but it predicts features not previously observed. We observe that the shallow hydrogenic impurity becomes deeper as the dot size (R) is reduced and with f…
Novel synthesis methods have been investigated for the preparation of Bi 4 Ti 3 O 12 ferroelectric Aurivillius-type powders, namely, the wet no-coprecipitated chemistry using a n -butylamine aqueous solution and two mechanochemical activation techniques (vibrating and planetarium mills). For the sake of comparison, Bi…
Arylamine N-acetyltransferases (EC 2.3.1.5) (NATs) catalyse the biotransformation of many primary arylamines, hydrazines and their N-hydroxylated metabolites, thereby playing an important role in both the detoxification and metabolic activation of numerous xenobiotics. The recently published crystal structure of the S…
A supramolecular recognition interface is formed through the self-assembly of cyclic D,L-peptides. Phenyl–phenyl interactions direct the solid-state organization of dimeric peptide cyclo[(-L-Phe-D-MeN-Ala-L-hPhe-D-MeN-Ala)2] (1) by forming clusters of edge-to-face contacts between dimers (shown left), which suggests t…
The current status and prospects of research on ferromagnetism in tetrahedrally coordinated magnetic semiconductors and their nanostructures are reviewed. Results of a quantitative comparison between experimental and theoretical results, notably for Mn-based III–V and II–VI thin films and heterostructures, are present…
The dispersion of clay−diarylethene hybrid materials into an ionic biopolymer, gelatin, was investigated for the successful preparation of highly functional photochromic films. A mixture of the gelatin and the clay−diarylethene hybrid material dispersed in aqueous N,N -dimethylformamide (DMF) was cast on a glass plate…
The time-resolved electric-field relaxation in glassy D-sorbitol is measured by dielectric hole-burning, i.e. with and without a preceding high electric sinusoidal burn field. The question is whether the burn-induced modifications of the response are frequency-selective (dielectric “holes”) and thus indicative of hete…