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This paper gives an overview of the science of crystals of biological macromolecules. The historical background of the field is outlined and the main achievements and open problems are discussed from both biological and physical-chemical viewpoints. Selected results, including data from the authors, illustrate this ov…
Point-defect calculations in h.c.p. zirconium have been carried out with a pair potential constructed in terms of the generalized pseudopotential theory. Two models of the h.c.p. lattice with either the ideal or the experimental c/a ratio were considered. It has been found with both models that the monovacancy has the…
The role of surface roughness on the coefficient of friction and wear of polished CVD diamond films has been investigated. Diamond films grown on single crystal silicon (001) substrates by Hot Filament Chemical Vapor Deposition (HFCVD) process were polished by a chemomechanical process in which a diamond film was poli…
Abstract The Cushman‐Barber model was evaluated for K uptake by cotton ( Gossypium hirsutum L.) from vermiculitic soils of high K‐fixation capacity and low solution‐phase K + concentration. On these soils, cotton exhibits late‐season K deficiency while other crop species remain unaffected. Four soil treatments of NH 4…
An embedded-defect (ED) interatomic potential for Fe is presented. The ED model is based on the same physical description of interactions as the embedded atom method (EAM) but including angular-dependent many-body local terms. In this work, the ED potential is fitted to several Fe properties and is used to simulate th…
We compared sequential and separate extraction procedures for estimating non‐crystalline and crystalline aluminum (Al) and iron (Fe) in a floodplain forest soil. We used 0.2M acid ammonium oxalate (pH 3.0) to estimate non‐crystalline Al and Fe, dithionite‐citrate‐bicarbonate to estimate crystalline Fe, and 0.1M sodium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnomalous Segment Diffusion in Polymer MeltsMatthias Appel, Gerald Fleischer, Joerg Kaerger, Franz Fujara, and Inyong ChangCite this: Macromolecules 1994, 27, 15, 4274–4277Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1…
Unlike polycrystalline diamond films, amorphous hydrogenated carbon (AHC) films can be deposited at room temperature, are amorphous in atomic structure, and form very smooth surfaces. Amorphous hydrogenated carbon film consists of very small 10–20 Å sp2 bonded (graphitic) clusters captured in a largely sp3 coordinated…
We have used perturbed-angular-correlation (PAC) spectroscopy to measure nuclear-electric-quadrupole interactions at the Ti site in ceramic samples of rutile ${\mathrm{TiO}}_{2}$. To investigate differences in the probe crystal chemistry, we used two chemically different PAC probes, $^{111}\ensuremath{\rightarrow}^{11…
The development of important applications related to optical telecommunications and optical signal processing rely increasingly on nonlinear optical phenomena underlying these optical functions such as frequency conversion and modulation, amplification and emission, multiplexing and directional switching, optical logi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBehavior of Poly(D,L-lactic acid) Monolayers at the Air-Water Interface. Effect of Spreading SolventsCatherine Ringard-Lefebvre and Adam BaszkinCite this: Langmuir 1994, 10, 7, 2376–2381Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotopic Labeling Studies of the Effects of Temperature, Water, and Vanadia Loading on the Selective Catalytic Reduction of NO with NH3 over Vanadia-Titania CatalystsBronwyn L. Duffy, H. Edward Curry-Hyde, Noel W. Cant, and Peter F. NelsonCite this: J. Phys. Chem. 1994, 98,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Titanium and Zirconium Valerate Sol-Gel FilmsKathryn G. Severin, Jeffrey S. Ledford, Beatrice A. Torgerson, and Kris A. BerglundCite this: Chem. Mater. 1994, 6, 7, 890–898Publication Date (Print):July 1, 1994Publication History Published online1 May 2002P…
The wavelength dependence of the optical reorientation of nematic liquid crystals is investigated in the presence of two dyes, using the z-scan technique. A strong correlation is found between the magnitude of the dyeinduced amplification of the optical torque and the dichroism of the system.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Crystal Structure, Electrical Properties and Electronic Band Structure of (NHyMe4-y)x[M(dmit)2] Complexes (M = Ni, Pd, Pt; dmit2- = 2-Thioxo-1,3-dithiole-4,5-dithiolato)Brigitte Pomarede, Benedicte Garreau, Isabelle Malfant, Lydie Valade, P. Cassoux, Jean-Pierre L…
Thermal conductivity of crystalline natural nitrogen was investigated over the temperature range 1.2--38 K. The temperature dependence of thermal conductivity of \ensuremath{\alpha}-nitrogen has been determined in temperatures below 18 K. The thermal conductivity coefficient reaches the maximum value 250 mW/cm K at 3.…
Inelastic-neutron-scattering experiments have been performed on samples of amorphous hydrogenated carbon, prepared from acetylene and propane, containing about 35 and 32 at. % hydrogen, respectively. In these hard carbons, the hydrogen is predominantly bonded to ${\mathit{sp}}^{3}$ carbon, with approximately equal con…
Abstract The dielectric loss function of ZrO 2 over 0–80 eV has been determined from a quantitative analysis of reflection electron energy loss spectra (REELS) at different primary energies. From this, the inelastic electron mean free path for 200–2000 eV electrons in ZrO 2 has been calculated. The inelastic mean free…
Abstract The catalytic polymerization of aniline and its derivatives was performed by stirring the solution of the corresponding monomer and copper(II) salts (50/5, mmol/mmol) in acetonitrile and water (1/1, v/v) under oxygen at room temperature for 24 h. Among copper salts, CuBr2 and CuCl2 are more active than the ot…
Abstract Enantioselective aerobic epoxidation of acyclic cis-olefins into the corresponding optically active epoxides was carried out with good-to-high enantioselectivities by using a new class of optically active β-ketoiminato manganese(III) complex catalyst, N,N′-ethylenebis(α-mesitoyl-β-ketoiminato)manganese(III) c…