Materials Literature
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We purified a geranylgeranylglyceryl phosphate (GGGP) synthase from Thermoplasma acidophilum by several steps of chromatography. Based on the proteinase-fragment-mass-pattern analysis of the SDS-PAGE band of the partially purified protein, the DNA sequence encoding the protein was identified from the whole genome sequ…
Slow crack growth in a model of homogeneous brittle elastic material is described as a thermal activation process where stress fluctuations allow to overcome a breaking threshold through a series of irreversible steps. We study the case of a single crack in a flat sheet for which analytical predictions can be made, an…
In this paper, cotton fibers and their fabric are treated with butanetetracarboxylic acid (BTCA) with the catalyst sodium hypophosfite (SHP) at different concentrations of treating agent and different curing temperatures. Results show that low curing temperatures and low agent concentrations have a slight effect on th…
Piezoelectric ZnO thin films have been successfully used for multilayer surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices. Magnesium zinc oxide (Mg/sub x/Zn/sub 1-x/O) is a new piezoelectric material, which is formed by alloying ZnO and MgO. Mg/sub x/Zn/sub 1-x/O allows for flexibility in thin film SAW…
Original material of Ehrenberg's from Santa Fiora (Tuscany, Italy) was examined to establish the identity of the diatom to which Ehrenberg gave the name Gaillonella italica. It was compared with other Ehrenberg material, notably from New England, and with numerous other samples, both fossil and recent, with a view to…
We introduce a hard-core lattice-gas model on generalized Bethe lattices and investigate its compaction behavior analytically and numerically. If compactified slowly, the system undergoes a first-order crystallization transition. If compactified much faster, the system stays in a meta-stable liquid state and undergoes…
The precise arrangement of B- and T-lymphocytes in the different compartments of the human splenic white pulp is still largely unknown. We therefore performed a 3D reconstruction of 150 serial sections of a representative adult human spleen alternately stained for CD3 and CD20. The results indicate that the T-cell reg…
Seedrow-placed urea minimizes soil disturbance in reduced tillage systems, but it generally decreases emergence at nitrogen (N) rates adequate for optimum crop yield. The objective of this study was to determine the influence of coating urea fertilizer granules with a urease inhibitor or a polymer on the emergence and…
Abstract The intercalation of aluminosilicate clays proceeds via a critical conformation change. Ion exchange of the poly(oxypropylene)diamine salts allows widening of the clay layers from 12 Å to 20 Å and then a sharp increase to 58 Å. The data indicate a critical conformation change of the intercalated amines, thus…
Two 3 mm thick microscope glass plates, having one face plus their two long edges coated by a thick metallic film, are spaced 75 μm apart by mylar spacers. Because of the metallic coatings on the inner faces the structure acts as a single metallic slit. The space between the two coated plates is filled with aligned ne…
Lake Hovsgol (51°N, 101°E) is Mongolia's largest lake, over 1.6 million years old, and the southernmost extant lake in the 25 million years old Baikal Rift Zone. In spite of their proximity and geological relationship, Lake Baikal and Lake Hovsgol share no common offshore planktonic diatoms, though their planktonic co…
Xyloglucan was adsorbed onto bleached soft-wood kraft pulp followed by preparation and analysis of handsheets with respect to sheet formation as well as sheet mechanical and optical properties. Adsorption of xyloglucan was found to be slow. After more than 20 hrs adsorption, equilibrium had not been reached. The amoun…
Abstract Surfaces prepared by vacuum depositing silver on silica nanospheres were investigated as surface‐enhanced Raman scattering (SERS) substrates using benzoic acid as an analyte. The SERS sensitivity of the substrates was probed as a function of substrate parameters, such as silver‐film thickness and silica‐bead…
An optimization procedure to obtain the parameters of both the original Jiles-Atherton and the inverse Jiles-Atherton hysteresis models is presented in this paper. Doing so, minor loops can be conveniently simulated without inserting scaling methods. The comparison between experimental and calculation results validate…
This paper presents an original method for computing the deformation due to both magnetic forces and magnetostriction in ferromagnetic material. The method is applied to rotating electrical machines and transformers and is compared with other methods found in literature.
We report on the transport properties of LaTiO3+ε and LaTiO3.5 films. The LaTiO3+ε samples show metallic transport and several samples exhibit a hysteretic drop of resistance during cooldown at ∼240 K. The ferroelectric LaTiO3.5 samples, grown in capacitor structures, have nonlinear, diode-like and hysteretic V(I) cha…
[structure: see text] The first class of zipper-shaped artificial duplexes, which are driven by multiple donor-acceptor interactions between electron-rich 1,5-dioxynaphthalene or 1,4-dioxybenzene and electron-deficient pyromellitic dimide units, have been studied in organic media by (1)H NMR, UV-vis, and vapor pressur…
The influence of elastic anisotropy on the critical thickness for the plastic relaxation of epitaxial layers is examined with the help of a coupled discrete-continuum simulation. The latter incorporates a rigorous treatment of the boundary conditions and of mismatch stresses, as well as the elastic properties of a sin…
(Chemical) processes under spatial confinements are important for a number of areas, as for instance in catalysis (chemistry) or enzymatic reactions (biology). The role of the spatial restriction parallel to the functional interactions in these systems is hard to trace. Ordered mesoporous silica materials are ideal to…
Chemically deposited silver particles are widely used for surface-enhanced Raman scattering (SERS) and more recently for surface-enhanced fluorescence (SEF), also known as metal-enhanced fluorescence (MEF). We now show that metallic silver deposited by laser illumination results in an approximately 7-fold increased in…