Materials Literature
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The triterpenes isolated from P. cocos and their derivatives were examined for anti-emetic activity. Some of these triterpenes inhibited emetic action induced by oral administration of copper sulfate pentahydrate to leopard frog. The triterpenes having an exomethylene group at C-24 showed anti-emetic activity to frogs.
Abstract Poly( L ‐lactide)‐ block‐ poly( L ‐amino acids) block copolymers were prepared via polymerization of α‐amino acid N ‐carboxyanhydrides with amino‐terminated poly( L ‐lactide)s as macroinitiators. Two types of macroinitiators were used, one with an aminopropoxy head group (number‐average molecular weight M n =…
We derive a mean-field model for a semiflexible chain using a functional integral approach. The resulting model satisfies the global constraint 〈u2(s)〉=1 rather than the hard constraint that u2(s)=1 for all s. The function u(s) is the tangent vector ∂r/∂s, where r(s) represents the conformation of the chain and s is t…
Abstract Coordination sequences for five 3-dimensional, ten 4-dimensional and eleven higher-dimensional lattices have been determined and all but one can be expressed as simple polynomials. Some regularities in these polynomials are observed. The correlation between topological and geometric density is demonstrated fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Destruction of Volatile Organic Compounds Using Supported Platinum and Palladium Hydrophobic CatalystsRamesh K. Sharma, Bing Zhou, Shimin Tong, and Karl T. ChuangCite this: Ind. Eng. Chem. Res. 1995, 34, 12, 4310–4317Publication Date (Print):December 1, 1995Publica…
Abstract Magnetic long‐range exchange coupling between two unpaired electrons of two copper(II) ions in a square‐pyramidal ligand environment (d ) 1 , which are rigidly separated by > 10 Å by an organic spacer ligand (e.g., a μ‐dicarboxylato ligand) has been systematically studied. The following complexes have been…
SUMMARY Some recent experimental and theoretical developments in secondary electron (SE) imaging are reviewed. Coincidence experiments identify inner‐shell excitations and single electron valence excitations often as more significant initial events in SE production than the more delocalized process of plasmon generati…
Abstract The mechanism of oxidation of copper at the alloy/film interface, and the subsequent migration of copper ions in barrier‐type films, has been examined for anodizing of an Al—1.5 wt.% Cu alloy with a prior chemical polishing treatment. Both chemical polishing and anodizing result in formation of a thin layer o…
ABSTRACT Some diatom exudates may remain attached to the exterior cell surface, potentially altering cell stickiness and affecting important aspects of the diatom's ecology such as aggregation rates and grazing rates. We measured the accumulation of cell‐surface sugar‐containing compounds by labeling cultured marine d…
Excessive free radical formation or antioxidant enzyme deficiency can result in oxidative stress, a mechanism proposed in the toxicity of MPTP and in the etiology of Parkinson's disease (PD). However, it is unclear if altered antioxidant enzyme activity is sufficient to increase lipid peroxidation in PD. We therefore…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible O2 Binding to a Dinuclear Copper(I) Complex with Linked Tris(2-pyridylmethyl)amine Units: Kinetic-Thermodynamic Comparisons with Mononuclear AnalogsDong-Heon Lee, Ning Wei, Narasimha N. Murthy, Zoltan Tyeklar, Kenneth D. Karlin, Susan Kaderli, Bernhard Jung, and A…
The long-time self-diffusion and phase behavior of a binary dispersion of hard spheres with a size ratio of 1:9.3 were studied. Labeling one of the particle species in the mixtures with a fluorescent dye allows for the measurement of its long-time self-diffusion coefficient using fluorescence recovery after photo- ble…
Local expression of cellular and molecular signals is required for normal neuronal migration and differentiation during neocortical development and during periods of plasticity in the adult brain. We have previously shown that neonatal and juvenile mice that induction of apoptotic degeneration in neocortical pyramidal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOligomer Characterization of 4-23 kDa Polymers by Electrospray Fourier Transform Mass SpectrometryPeter B. O'Connor and Fred W. McLaffertyCite this: J. Am. Chem. Soc. 1995, 117, 51, 12826–12831Publication Date (Print):December 1, 1995Publication History Published online1 May…
Al[sbnd]Pd[sbnd]Mn single-quasicrystals have been plastically deformed at temperatures between 730 and 800°C up to different strain values and analysed in the transmission electron microscope. Dislocations were created during deformation. The dislocation density ranged between 1·7 × 107 cm−2 in undeformed samples and…
The binding energy of nine alkanoic acids to the major crystal faces of adipic acid were calculated employing molecular modelling techniques. The results indicate that the alkanoic acids bind strongly to the surface when compared to solvents and to adipic acid itself indicating that the alkanoic acids could be potenti…
Summary Microbial aspects of podzolization were studied by percolating organic acids through sterile and non‐sterile soil in columns. Six columns containing sand from a fluvioglacial sediment were percolated (90 mm d −1 ) with mor extract and an oxalate‐citrate solution. In three of these, sterilized soil solutions we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic Characterization and Dynamic Properties of Cationic .eta.2-Silane and .eta.2-H2 Complexes of General Structure Cp(CO)(L)Fe(HSiR3)+ and Cp(CO)(L)Fe(H2)+ (L = PEt3, PPh3)Eric Scharrer, Seok Chang, and Maurice BrookhartCite this: Organometallics 1995, 14, 12, 5686…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Comparison of Self-Consistent Field Theories for Polymers near Interfaces with Monte Carlo SimulationsFriederike Schmid and Marcus MuellerCite this: Macromolecules 1995, 28, 25, 8639–8645Publication Date (Print):December 1, 1995Publication History Published onli…
Abstract The synthesis and structural characterisation of three copper–lanthanoid complexes are reported. The compounds, of general formula [Cu 3 M(chp) 8 (NO 3 )(S)] [M = Gd, S = H 2 O in 2 ; M = Dy, S = H 2 O in 3 ; M = Er, S = (H 2 O) 0.5 (MeOH) 0.5 in 4 ; chp = anion of 6‐chloro‐2‐pyridone], are made by reaction o…