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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…
The concept of mesophase stabilization by partial fluorination of side chains has been extended to discotic systems. The mesophase structure is essentially unchanged, whereas the temperature range of the mesophase is strongly affected by the fluorinated side chains. Triphenylene substituted with only one partially flu…
We have identified an operon in Bacillus subtilis, designated qcr, that is thought to encode a quinone: cytochrome c reductase. Northern (RNA blot) analysis suggests a tricistronic operon. The operon is located at about 200 degrees on the B. subtilis map. Disruption of the operon leads to loss of a 22-kDa cytochrome c…
The classical theory of nucleation and growth of crystals is examined for concentrated suspensions of hard-sphere colloidal particles. The work of Russel is modified, extended, and evaluated, explicitly. Specifically, the Wilson-Frenkel growth law is modified to include the Gibbs-Thomson effect and is evaluated numeri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimultaneous Improvement of Permeance and Permselectivity of 3,3',4,4'-Biphenyltetracarboxylic Dianhydride-4,4'-Oxydianiline Polyimide Membrane by CarbonizationJun-ichiro Hayashi, Masatake Yamamoto, Katsuki Kusakabe, and Shigeharu MorookaCite this: Ind. Eng. Chem. Res. 1995,…
Solutions of K4[Mo(CN)8] and Me3SnCl interdiffuse to form crystals of 1, a three-dimensional coordination polymer containing large channels from which some of the solvent molecules can be removed without the collapse of the structure (section of structure depicted on the right). The corresponding iso-structural tungst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZero-Pressure Thermal-Radiation-Induced Dissociation of Gas-Phase Cluster Ions: Comparison of Theory and Experiment for (H2O)2Cl- and (H2O)3Cl-Robert C. Dunbar, Terrance B. McMahon, Detleff Thoelmann, D. Scott Tonner, Dennis R. Salahub, and Dongqing WeiCite this: J. Am. Chem…
SUMMARY Imaging filters developed over the last few years permit rapid elemental mapping by energy‐filtering transmission electron microscopy (EFTEM), with resolution and sensitivity limited primarily by the sample and by the TEM. We explore the attainable spatial resolution in the elemental maps theoretically and exp…
The plastic deformation behaviour of polysynthetically twinned (PST) Ti-Al with three different orientations has been studied in tension and compression as a function of temperature in a range from −196 to 1100°C. With increase in temperature, the yield stress decreases rather rapidly at low temperatures and then decr…
The formal exchange of the pyrrole units of porphyrin by bipyrrole units provides the title compound 1. The hexadecaethyl derivative of 1 is the only isolable product of a MacDonald condensation of tetrapyrrolic as well as of dipyrrolic components. The new cyclooctapyrrole adopts a figure-eight conformation in the sol…