Materials Literature
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Chiral nematic materials with reversibly controlled helical pitch are synthesized here and their photo-optical properties are investigated. Selective light reflection in the green region is observed and patterns such as that shown in the Figure can be recorded. High fatigue resistance is also demonstrated for these ma…
Gene therapy has yet to achieve reproducible clinical efficacy, due to inadequate gene delivery, inadequate gene expression, or dose-limiting toxicity. We have developed a gene therapy technology for tissue repair and regeneration that employs a structural matrix for DNA delivery. The matrix holds the DNA vector at th…
Abstract The value of a Cryo SEM system, attached to a conventional SEM, has already been demonstrated in the biological, pharmaceutical, oil, paint, plastics and food industry. Specimens are first rapidly frozen to below -160°C, transferred under vacuum to a cryo preparation chamber, fractured and examined at low KV…
Abstract Electron energy-loss spectrometry and energy-filtered imaging allow the possibility of detecting, quantifying and mapping of boron. Boron spatial distribution in biological tissue is of particular interest for boron neutron capture therapy (BNCT) for cancer. We have studied the limits of boron quantification…
Abstract The decomposition of dichloromethane (CH2Cl2) in model air gases (concentration, around 100 ppm) by electron beam (EB) and γ-ray irradiation was studied using batch-type glass reactors of 500 ml volume. The addition effect of water on the decomposition was also investigated. In dry air, one-pass EB irradiatio…
Article Analytical Determination of Water Effects on the Anodic Dissolution of Aluminum in Nonaqueous Electrolytes was published on August 1, 2000 in the journal Reviews in Analytical Chemistry (volume 19, issue 3-4).
We propose an indirect approach to the generation of a two-dimensional quasiperiodic (QP) pattern in convection and similar nonlinear dissipative systems where a direct generation of stable uniform QP planforms is not possible. An eightfold QP pattern can be created as a broad transient layer between two domains fille…
ADVERTISEMENT RETURN TO ISSUEPREVNoteSynthesis of Poly(3-hydroxybutyrate) by Ralstonia eutropha in the Presence of 13C-Labeled Ethylene GlycolDevang T. Shah, Pierre A. Berger, Minhtien Tran, Jawed Asrar, Leigh A. Madden, and Alistair J. AndersonView Author Information Monsanto Co., 800 N. Lindbergh Blvd., St. Louis, M…
We investigate the elastic behavior of highly swollen hexagonal phases. These systems consist of oil cylinders of radius R up to 17 nm, coated with a surfactant monolayer and closely packed on a triangular lattice in water. We perform creep tests experiments: upon application of a small stress, polycrystalline samples…
The ordering in the assembly of biaxial molecules which interact pairwise via the dispersion force is investigated statistical-mechanically, where four kinds of liquid crystalline phase and phase transitions between some pairs of those phases are discussed in comparison with the existing theoretical results from the m…
The barocaloric effect reflects a new cooling principle at low temperatures without the need of liquefied gases nor magnetic fields as used in other cooling techniques. A pressure induced structural and/or magnetic phase transition is used to obtain a significant change in the system's entropy which leads to its cooli…
Symmetric, peripherally substituted dihydroxysilicon tetrapyrazinoporphyrazines 5 and 6 were synthesized by reacting the diiminoisoindolines 1 and 2 with SiCl 4 in pyridine as solvent at considerably low temperature followed by hydrolysis of the intermediate dichlorosilicon tetrapyrazinoporphyrazines 3 and 4. In addit…
Duplex stainless steel ([DSS] UNS S31260) was investigated with the ferrite-austenite microstructure to determine the formation, growth, and redox behavior of passive films in borate buffer solution (pH = 9.3). The mechanism of growth and thickness of passive films were investigated by electrochemical impedance spectr…
The maximum densities of holes generated by cation vacancies, as well as thermoelectric parameters of (Pb 1− x Sn x ) 1− y Te y solid solutions with tin content x in the range from 0.4 to 0.6, were investigated. It is shown that each vacancy produces four holes in the valence band and that only for small x can the con…
A general model of smoothing-induced distortions of an X-ray diffraction (XRD) peak is derived from theoretical analyses by convoluting a Savitzky–Golay (S.–G.) polynomial filter with the Gaussian, Lorentzian and pseudo-Voigt curves. This is based on the assumption that an XRD peak consists of five basic parameters an…
Dissipative Particle Dynamics (DPD) is employed to model the dynamics and rheology of polymer solutions, and suspensions of spherical particles with adsorbed polymers. Static and dynamic scaling relationships for the variation of radius of gyration and relaxation time with polymer chain length are reviewed, demonstrat…
The handle and other mechanical properties of selectively bleached and unbleached fabrics knitted from fine yak hair are evaluated by means of the FAST system. Results of amino acid analysis and SEM investigations are used as a basis for discussing the reasons for handle impairment. An improved process for better hand…
Improvement of tensile mechanical properties under dynamic loading is demonstrated for two commercial magnesium alloys. Ductility in magnesium is enhanced by the addition of alloying elements. Further enhancement of ductility can be achieved by the refining grain structures for two commercial magnesium alloys. AZ3 1 a…
Abstract The acid‐catalyzed dissociation rate constants of the cerium(III) complexes of 1,4,8,11‐tetraazacyclo‐tetradecane‐1,4,8,11‐tetraacetic acid (TETA) and 1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetraacetic acid (DOTA) have been determined at four different temperatures (i.e., 25.0°C,32.0°C,39.0°C,45.0°C) in aque…
Durch Umsetzungen von Zink- und Cadmiumchlorid mit Na2[Fe(CO)4] können eine Reihe neuer (Eisencarbonyl)zink- und -cadmiumchloride synthetisiert werden, wobei der jeweilige Reaktionsverlauf stark vom verwendeten Lösungsmittel abhängt. Im Falle der Reaktion von ZnCl2 mit Na2[Fe(CO)4] werden drei verschiedene Verbindunge…