Poly-(R)-3-hydroxybutyrate (PHB) biosynthesis: mechanistic studies on the biological Claisen condensation catalyzed by β-ketoacyl thiolase
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Structural and Stereochemical Relations Between Acidic Macromolecules of Organic Matrices and Crystals
Detailed studies of the molecular organization of various mineralized tissues highlight the role played by acidic glycoproteins in controlling crystal formation. In vitro experiments show that these macromolecules are able to interact with specific faces of different crystals, influencing both nucleation and crystal g…
Backscatter Kikuchi diffraction in the SEM for identification of crystallographic point groups
Abstract A preliminary account is given of the application of backscatter Kikuchi diffraction patterns (BKP) to point group determination in the SEM. Studies carried out on bulk specimens selected from the 32‐point groups indicate that 27 of the 32‐point groups can be determined unambiguously using BKPs, though distin…
The New Physical Optics Notebook: Tutorials in Fourier Optics
Approaches the topic of physical optics with examples drawn from the physical processes described. Includes chapters on Fourier transforms, image formation, optical coherence, diffraction, interference, holography, interferometry, analog optical computing, synthetic aperture imaging, and others. Contains more than 600…
Invited Lecture. New results on the electrohydrodynamic instability in nematics
We present theoretical results on the threshold and near-threshold behaviour of electrohydrodynamic convection of planarly aligned nematics under D.C. and A.C. driving. We use the general three dimensional description and include the flexoelectric effect. The experimentally established threshold behaviour is captured…
Picosecond time-resolved measurements of crystallization in noble metals
Crystallization rates in pure metals have been measured by monitoring changes in reflectivity on a picosecond time scale during pulsed laser quenching. Multilayered films were used to establish that the transient decreases in reflectivity correspond to melting. Depth profiling with Auger electron spectroscopy on laser…
Broadband dielectric spectroscopy on side group liquid crystal polymers
Dielectric studies on three liquid-crystalline side group polymers were performed in the temperature range from 100 K to 450 K and in the frequency range from 10−1 Hz to 107 Hz. All samples exhibit an α relaxation with a WLF dependence of the activation energy as well as a β relaxation, which are comparable in the gla…
Surface molecular mobility and platelet reactivity of segmented poly(etherurethaneureas) with hydrophilic and hydrophobic soft segment components
Segmented poly(etherurethaneureas) (SPUUs) with hydrophilic and hydrophobic polyether components were prepared. The surface chemical composition of SPUUs in various environments was investigated by means of X-ray photoelectron spectroscopic and dynamic contact angle measurements. These measurements revealed that in a…
Cross-Linking and Stereospecific Structure of Collagen in Mineralized and Nonmineralized Skeletal Tissues
Molecular distributions of the intermolecular cross-links in fetal bovine bone type I collagen fibrils were quantitatively determined and compared with those of periodontal ligament. Results indicated that Hyl and Lys residues in the COOH-terminal nonhelical peptide portions (residues 16C) of both alpha 1 chains were…
Frustration and helicity in the ordered phases of a discotic compound
We have used X-ray diffraction to study the discotic mesophases D hd and Dho and the low temperature crystalline K phase of hexa(hexylthio)triphenylene. The high-temperature liquid crystalline Dhd phase is composed of a two-dimensional triangular array of columns, with short range intracolumn order. The intermediate-t…
Metastability of the Martensitic Transformation in a 12 mol% Ceria‐Zirconia Alloy: I, Deformation and Fracture Observations
A single‐phase tetragonal zirconia polycrystal containing 12 mol% cerium dioxide was found to readily undergo the tetragonal‐to‐monoclinic phase transformation on deformation, fracture, or cooling below 150 K. Deformation tests, primarily indentation studies, indicated that an extensive transformation zone developed a…
Electrochemical investigations of electronically conductive polymers. 2. Evaluation of charge-transport rates in polypyrrole using an alternating current impedance method
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical investigations of electronically conductive polymers. 2. Evaluation of charge-transport rates in polypyrrole using an alternating current impedance methodReginald M. Penner and Charles R. MartinCite this: J. Phys. Chem. 1989, 93, 2, 984–989Publication Date (P…
Thermal decay of laser-induced long living metastable electronic states in Na2[Fe(CN)5NO] · 2H2O single crystals
We report the thermal decay of extremely long-living metastable states in single crystals of Na 2 [Fe(CN) 5 NO] · 2H 2 O using differential scanning calorimetry. They are generated by laser light in the wavelength range of 350 nm – 580 nm, and their decay was measured in the temperature range of 106 K – 300 K. These s…
Director orientation of a ferroelectric liquid crystal on substrates with rubbing treatment: The effect of surface anchoring strength
One of the most important problems with ferroelectric liquid crystals is obtaining homogeneous as well as bistable alignment, not only to study their physical characteristics but also for their application to optical devices. In this connection it was predicted that the formation of homogeneous alignment requires stro…
Atomistic simulation of the surfaces of oxides
Recent simulation studies of the structure, energetics, dynamics and impurity segregation properties of oxide surfaces are reviewed. Results are included for MgO, CaO, SrO, Li2O, c-ZrO2, SrTiO3, Al2O3, Fe2O3 and La2CuO4.
The Anatomy of Buckling of Textile Fabrics: Drape and Conformability
This paper reviews the technological importance of the complex buckling of textile fabrics and discusses the limitations of conventional applied mechanics and of the empirical textile approaches. It stresses the importance of the occurrence of membrane strains in double curvature over finite areas, discusses briefly t…
Development of translucent aluminum nitride ceramics
On decrit les proprietes des poudres requises pour la production de ceramiques d'AlN translucides et a haute conductivite thermique. On discute du frittage sans adjuvant ou a l'aide de 3CaO•Al 2 O 3 . On presente les proprietes et applications de ces ceramiques
Computer simulation of diffusion-controlled reactions in dispersions of spherical sinks
The diffusion-controlled reaction rate of dispersions of overlapping (fully penetrable) and nonoverlapping static sinks are determined through computer simulations. The diffusive or random-walk motions of the solutes are simulated in continuum space based on the first passage time probability distribution. This method…
Corrosion resistance of electroplated zinc alloy coatings
SummaryZinc alloy electrodeposits containing 0 to 25% of Ni or Co have been prepared in the laboratory and carefully characterised with respect to composition and structure. Corrosion behaviour has been studied using salt spray and electrochemical methods. Results obtained have been compared to those found when testin…
Structure and reactivity of transition-metal oxide monolayers
Transition-metal oxides supported on and chemically interacting with the surface of SiO2, Al2O3, TiO2etc. form discrete monolayers of species unlike those found at the surface of the unsupported oxides, being in effect two-dimensional compounds. Areas of their application include alkene metathesis and polymerisation,…