Materials Literature
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The bis(stilbenyl)squaraines 6d − j,d ‘,j ‘ represent a novel class of NIR pigments. Their synthesis was performed by the regioselective 2-fold condensation of highly nucleophilic 3,5-dihydroxystilbenes 4d − j,d ‘,j ‘ with squaric acid ( 5 ). Depending on the substitution with alkoxy groups, the absorption maxima rang…
The bifurcation of the solutions of the nonlinear equilibrium problem of a weightless liquid bridge with a free surface pinned to the edges of two coaxial equidimensional circular disks is examined. The bifurcation is studied in the neighborhood of the stability boundary for axisymmetric equilibrium states with emphas…
Owing to the high efficiency of hepatocytes to take up bile acids, these endogenous compounds or their analogues can be considered as potential shuttles for delivering drugs to the liver. With the aim of using this strategy to target platinum(II)-related cytostatic drugs toward the hepatobiliary system, a cholylglycin…
Abstract This paper reviews mainly our recent investigations of two allomorphs of native cellulose, celluloses Iα and Iβ, carried out based on the composite crystal model by high resolution solid state 13 C NMR and electron microscopy. First the distribution of the two allomorphs in nature is described together with s…
A surface selection rule has previously been proposed for surface-enhanced infrared absorption that is analogous to the corresponding rule for bulk metals, in that molecular vibrations whose dipole moment change is perpendicular to the surface of the metal will be observable, and those vibrations whose dipole moment c…
Abstract Sodicity and clay type influence the decomposition of organic matter, and hence its accumulation in soil. In this study, the interaction of these two factors was examined. Two soils were prepared by mixing sand (57%) and silt (28%), separated from one soil, with clay (15%) separated from two soils. One clay t…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTShort Asymmetric Synthesis of (+)-α-Curcumene and (+)-XanthorrhizolA. I. Meyers and Diana StoianovaView Author Information Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872Cite this: J. Org. Chem. 1997, 62, 15, 5219–5221Publication Date (Web)…
A polymer dispersed liquid crystal was studied by dynamic light scattering. In the experiments, where no electric field is applied, the system exhibits additional slow dynamics to the ones observed in bulk nematic liquid crystals. This slow dynamics gradually disappears with an increasing electric field. While the mea…
The Leptospira meyeri serovar semaranga metX gene was identified by complementation of an Escherichia coli metA mutant, i.e., devoid of homoserine O-succinyltransferase. However, the MetX protein exhibited a homoserine O-acetyltransferase activity in agreement with its similarity to homoserine O-acetyltransferases. Re…
The reaction of [Ni(cyclam)](PF6)2 with K2CrO4 in water gave a chromato-bridged one-dimensional complex, catena-(μ-CrO4-O,O‘)[Ni(cyclam)]. In the complex, an intrachain ferromagnetic interaction is operative through the chromate bridges. The magnetic interaction was discussed in terms of the orbital topology of the fr…
Water-distilled volatiles from the leaves of Eryngium foetidum L. of Cuban origin were analyzed by a combination of GC and GC/MS. Forty-six components were identified, of which the major ones were found to be 2,4,5-trimethylbenzaldehyde (20.53%), hexadecanoic acid (12.05%) and carotol (9.94%).
Macromolecular conjugates of dextran and diethylenetriaminepentaacetic acid (DTPA), aimed to complex gadolinium, were synthesized to obtain contrast agents for nuclear magnetic resonance imaging with good paramagnetic properties and long intravascular persistence. These conjugates were prepared from dextran 40 (Mn = 3…
Continuous‐carbon‐fiber‐reinforced silicon carbide composites (C/SiC) were prepared by chemical vapor infiltration in which the preforms were fabricated with the three‐dimensional braid method. The mechanical properties and microstructures were investigated. For the composites with no interfacial layer, flexural stren…
Abstract Graft copolymers of poly(ethylene glycol) (PEG) on a chitosan backbone (PEG‐g‐chitosan) have been synthesized and their aqueous solution properties were investigated. At pH 6.5 the graft copolymers are 100% soluble, while chitosan phase separates from solution at those conditions. These interesting graft copo…
In contrast to numerical methods for beam shaping, analytical beam shaping consists of two steps: first, finding a purely geometrical distortion between the input plane and the output plane redistributing the intensity of the incoming wave front; and, second, computing a phase-only element realizing this coordinate tr…
Structures of Pt species derived from Pt 4 (μ-CH 3 COO) 8 on an α-Al 2 O 3 (0001) single-crystal surface were studied by means of in-situ polarization-dependent total reflection fluorescence XAFS (EXAFS and XANES) techniques. The Pt 4 cluster framework was destroyed upon the deposition of Pt 4 (μ-CH 3 COO) 8 by the re…
The kinetics of grain growth and Ostwald ripening in Al 2 O 3 ‐ZrO 2 two‐phase composites was systematically investigated using two‐dimensional (2‐D) computer simulations, based on a diffuse‐interface field model. Using average values for the experimentally measured ratios of the grain boundary energies to the interph…
A polyisoprene- block -poly(2-cinnamoyethyl methacrylate) (PI- b -PCEMA) sample with a narrow molar mass distribution was prepared and characterized. The sample formed spherical micelles in hexanes/THF with 20% of THF by volume. After photo-cross-linking of the PCEMA core took place, the PI corona block was cleft by o…
We present surface force data on three different polystyrene/poly(2-vinylpyridine) block copolymers (PS/P2VP) with a fixed size of the nonadsorbing PS block but widely varying sizes of the adsorbing P2VP block. With respect to the sizes of the two blocks, they range from moderately to highly asymmetric. The equilibriu…
Carbohydrates are often key components in the formulation of extrusion pastes, yet the reasons for selection are presently empirical. The influence on paste extrusion of various types of carbohydrates, such as starch, dextrin, lactose, and glucose, have been studied and related to their water retention capacities. The…