Materials Literature
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The lumazine synthase/riboflavin synthase complex of Bacillus subtilis consists of an icosahedral capsid of 60 beta subunits enclosing a triplet of alpha subunits. An X-ray structure of 0.32 nm resolution has been obtained for the icosahedral capsid of the native alpha 3 beta 60 complex [Ladenstein, R., Schneider, M.,…
Effects of hydrostatic pressure on Raman scattering and electronic absorption spectra have been investigated in layered cupric chloride (C2H5NH3)2CuCl4, consisting of strongly Jahn–Teller (JT) deformed CuCl4 layers. We observed selective deactivation of the Cu–Cl stretching modes at a pressure above ∼4 GPa, and interp…
The physical and electrical properties of Pb[(Sc 1/2 Nb 1/2 ) 1- x Ti x ]O 3 ( x =0.40–0.45)+0.01 PbNb 2 O 6 piezoelectric polycrystalline ceramic materials near the morphotropic phase boundary (MPB) were investigated. The maximum dielectric constant ( ε 33 T / ε 0 =3200) and maximum piezoelectric constant ( d 33 =590…
Many animals from different phyla use structures bearing arrays of hairs to perform a variety of important functions, such as olfaction, gas exchange, suspension feeding and locomotion. The performance of all these functions depends on the motion of water or air around and through these arrays of hairs. Because organi…
We measure optically the order induced by a stabilizing electric field $E$ in the isotropic phase of a liquid crystal mixture of ${4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\mathrm{octyl}\ensuremath{-}\mathrm{cyanobiphenyl}$ and ${4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\mathrm{decyl}\ensuremath{-}\mathr…
A new solid‐state electrochromic system is presented. It is transparent and is comprised of a tungsten oxide and Prussian blue (PB) thin film couple in combination with a proton‐conducting, solid polymer electrolyte. This electrochromic system exhibits rapid and deep optical switching; characteristic of a complementar…
Two distinct Bacillus subtilis genes (citA and citZ) were found to encode citrate synthase isozymes that catalyze the first step of the Krebs cycle. The citA gene was cloned by genetic complementation of an Escherichia coli citrate synthase mutant strain (W620) and was in a monocistronic transcriptional unit. A diverg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure and Spectroscopic and Magnetic Properties of Two cis-Azido Catenas of Nickel(II): cis-catena-(.mu.-N3)[Ni(bipy)2](X) (X = ClO4, PF6)Roberto Cortes, Karmele Urtiaga, Luis Lezama, J. Luis Pizarro, Aintzane Goni, M. Isabel Arriortua, and Teofilo RojoCite this:…
Precision Raman spectra have been measured on lead magnesium niobate (PMN)–lead titanate (PT) solid solution at various temperatures. The multiband Raman spectra are inconsistent with Pm3m symmetry but can be accommodated within a model of ordered nanodomains of rhombohedral symmetry. Raman band widths are large and n…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of Composition Fluctuations in Diblock Copolymer Solutions Far from and Near to the Ordering TransitionT. Jian, S. H. Anastasiadis, A. N. Semenov, G. Fytas, K. Adachi, and T. KotakaCite this: Macromolecules 1994, 27, 17, 4762–4773Publication Date (Print):August 1, 1…
The morphology and primary crystal structure of SLPF, a protein polymer produced by genetically engineered Escherichia coli bacteria, were characterized. SLPF is a segmented copolymer consisting of amino acid sequence blocks modeled on the crystalline segments of silk fibroin and the cell attachment domain of human fi…
The dynamics of phase separation in two-dimensional binary mixtures diluted by surfactants is studied by means of molecular dynamics simulations. In contrast to pure binary systems, characterized by an algebraic time dependence of the average domain size, we find that systems containing surfactants exhibit nonalgebrai…
Abstract Enantioselective epoxidation of unfunctionalized olefins is achieved by the combined use of molecular oxygen and pivalaldehyde in the presence of a catalytic amount of optically active Mn(III)–salen complexes. N-Alkylimidazoles are effective axial ligands to produce optically active epoxides with high enantio…
Lipid particle size and distribution were found to significantly affect the water vapor permeability (WVP) properties of whey protein/beeswax edible emulsion films. Films oriented with the lipid-enriched side facing the high relative humidity environment during WVP testing exhibited lower WVPs. Particle size distribut…
and were investigated as potential low voltage cathodoluminescence phosphors for use in vacuum fluorescent displays. A low‐voltage cathodoluminescence spectrophotometer was developed for phosphor characterization. Brightness was measured as a function of anode voltage (10 to 300 V). The effects of activator concentrat…
Aqueous solutions of zirconium acetate and aluminum nitrate were spray pyrolyzed at 250°C and upquenched to different temperatures to yield metastable solid solutions of composition Zr (1− x ) Al x O (2− x /2) . An amorphous oxide forms first during pyrolysis which subsequently crystallizes as a single phase for x ≤ 0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization Kinetics and Morphology of Poly(3-hydroxybutyrate)/Cellulose Ester BlendsMaria Pizzoli, Mariastella Scandola, and Giuseppina CeccorulliCite this: Macromolecules 1994, 27, 17, 4755–4761Publication Date (Print):August 1, 1994Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerspectives on Solid-State Host-Guest AssembliesV. Ramamurthy and D. F. EatonCite this: Chem. Mater. 1994, 6, 8, 1128–1136Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://doi.org/10.1021/cm00044a011R…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactivity of Organic Anions Promoted by a Quaternary Ammonium Ion DendrimerJeng-Jong Lee, Warren T. Ford, J. A. Moore, and Yufei LiCite this: Macromolecules 1994, 27, 16, 4632–4634Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published…
The crystal structure of the complex between ribonuclease A and d(ApTpApApG) has been solved by xray crystallography using the molecular replacement method. The model includes, besides the enzyme, the d(ApTpApA) 5'-segment (A'T2ASA4) and 68 solvent molecules. The R-factor for the strongest 87p of the measured data tha…