Materials Literature
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Seventy eight taxa of Bacillariophyceae belonging to 1 species of Aulacoseira, 1 species of Cyclotella, 1 species of Tabellaria, 1species of Diatoma, 1 species of Thallasionema, 1 species of Grammatophora, 1 species of Fragilaria, 8 species of Synedra, 2 species of Achnanthes, 1 species of Cocconeis, 1 species of Diad…
The genetic bases of skeletogenesis are expected to shed light on the origins of metazoan biomineralization. Here we review aspects of genetic machineries of invertebrate skeletogenesis, including regulatory genes involved in biomineralization as well, and with an enumerative reference to the genes encoding skeletal m…
The history of the creation of conducting polymers is reviewed and their properties are considered. Some special charge-transport features of phthalide-containing polymers—the injection mechanism, high conductivity, and the dependence on boundary conditions—are described. Conditions for a polymer film transition to hi…
In this work, the relationship between the nanoscale morphology and electrochemical performance of vanadium oxide and vanadium oxide/polyaniline nanofibers is analyzed. The nanofibers were prepared by reverse micelle method and their electrochemical performances were evaluated as potential cathode materials for second…
The present study was aimed at developing and exploring the use of PEGylated poly (propylene imine) dendritic architecture for the delivery of an anti-tuberculosis drug, rifampicin. For this study, PEGylated poly(propylene imine) dendritic architecture was synthesized and loaded with rifampicin. Various physicochemica…
The effects of lipid composition and preparation conditions on the physicochemical and technological properties of gemcitabine-loaded liposomes, as well as the in vitro anti-tumoral activity of various liposome formulations were investigated. Three liposome formulations were investigated: DPPC/Chol/Oleic acid (8:3:1 m…
We study thermal rectifying effect in two dimensional (2D) systems consisting of the Frenkel Kontorva (FK) lattice and the Fermi-Pasta-Ulam (FPU) lattice. It is found that the rectifying effect is related to the asymmetrical interface thermal resistance. The rectifying efficiency is typically about two orders of magni…
A longstanding goal of research in semiconductor spintronics is the ability to inject, modulate, and detect electron spin in a single device. A simple prototype consists of a lateral semiconductor channel with two ferromagnetic contacts, one of which serves as a source of spin-polarized electrons and the other as a de…
The resistive and reactive parts of the magneto-impedance of sintered ferromagnetic samples of La0.7Sr0.3-xAgxMnO3 (x = 0.05, 0.25) have been measured at room temperature (
The problem of the partial discharge (PD) extinction is investigated. The transient process takes place in a small spherical inclusion which is located in the dielectric. Both the losses caused by polarization and ohmic losses as the dielectric parameters are taken into account. From the inclusion standpoint the diele…
Previous attempts to refine the crystal structure of welshite, known only from Långban, Sweden, have been foiled by its extensive polysynthetic twinning, and without a structure determination, derivation of a reasonable formula has been difficult due its eclectic chemical composition. We report a successful refinement…
Etheral solutions of free base tripyrrins (HTrpy) were prepared by treatment of nickel isocyanate complexes (TrpyNiNCO) with excess cyanide. From these solutions sensitive metallotripyrrins with cobalt(II), iron(II), and manganese(II) ions (TrpyMX) and with a choice of external ligands X could be obtained in pure, cry…
El uso de interconectores metálicos en pilas de combustible de óxido sólido (SOFC) en sustitución de materiales cerámicos ha sido posible gracias a la investigación y desarrollo de nuevos materiales metálicos. Inicialmente, el uso de interconectores metálicos fue limitado, debido a la elevada temperatura de trabajo, o…
Polyhydroxyalkanoates (PHAs) are a class of biopolymers that are currently the subject of intensive research for various applications (packaging, consumer products, medical applications, etc.). It is known from synthetic polymers that all plastic materials show more or less pronounced autoxidation (aging induced by UV…
The 17 O NMR spectra of glasses quenched from melts at high pressure are often difficult to interpret due to overlapping peaks and lack of crystalline model compounds. High-pressure aluminosilicate glasses often contain significant amounts of [5] Al and [6] Al, thus these high-pressure glasses must contain oxygen bond…
Experiments in the system K 2 O-(NH 4 ) 2 O-Al 2 O 3 -SiO 2 -H 2 O-HCl have been conducted between temperatures of 400 and 600 °C at pressures of 200, 400, 500, and 1500 MPa. The run products consisted of solid solutions of the K-feldspar.-buddingtonite, muscovite- tobelite series, and quartz. The run products were ch…
The thermodynamic properties of crystalline and liquid KAlSi 3 O 8 are used to calculate the fusion curve of sanidine to 6.5 GPa. New values for the enthalpy and entropy of fusion of sanidine at one bar and 1200 °C (ΔH Tf = 63.0 kJ/mol, ΔS Tf = 42.8 J/mol-K) are recommended on the basis of improved heat-capacity equat…
Zincalstibite, a new mineral occurring within the cavities of marble of the Apuan Alps, Tuscany, Italy, has chemical formula Zn 2 AlSb(OH) 12 , space group P3̄, a = 5.321(1), c = 9.786(2) Å. It is associated with sub-millimeter tufts of white crystals of mimetite and sub-millimetric stalactite aggregates of opal and a…
The crystal structure of tooeleite, Fe 6 (AsO 3 ) 4 (SO 4 )(OH) 4 ·4H 2 O, has been solved from high-resolution synchrotron XRD powder data recorded on a sample from Tooele county, Utah. The structure is monoclinic, space group C2/m, a = 8.9575(1), b = 6.4238(1), c = 9.7912(1) Å, β = 96.032(1)°, V = 560.27(3) Å 3 , d…
Spinel single crystals of four compositions along the MgAl 2 O 4 -MgMn 2 O 4 join, with Mn 3+ up to 0.25 apfu, were synthesized by use of a flux-growth method. The crystals were analyzed by electron microprobe, X-ray single-crystal diffraction, and optical absorption spectroscopy. Results revealed that Mg contents var…