Materials Literature
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Identification of therapeutic strategies to prevent or cure diseases associated with amyloid fibril deposition in tissue (Alzheimer's disease, spongiform encephalopathies, etc.) requires a rational understanding of the driving forces involved in the formation of these organized assemblies rich in beta-sheet structure.…
Fundamentals of Ceramics presents readers with an exceptionally clear and comprehensive introduction to ceramic science. This Second Edition updates problems and adds more worked examples, as well as adding new chapter sections on Computational Materials Science and Case Studies. The Computational Materials Science se…
The ytxM gene product from Bacillus subtilis has been cloned, expressed in Escherichia coli, purified and crystallized by the hanging-drop vapour-diffusion method using PEG 3350 as the precipitant. Multiple-wavelength anomalous dispersive X-ray data have been collected to 2.0 A resolution on a single selenomethionine-…
Abstract For Abstract see ChemInform Abstract in Full Text.
A data-collection method for macromolecular crystals using convergent sources is described here. Because of the unique characteristics of the diffraction patterns, a software package CBMPRO has been developed specifically for processing data images collected with the convergent beam method (CBM). The resulting data se…
The structure of Escherichia coli argininosuccinate synthetase (EAS) has been determined using S-SAD, Se-SAD and S/Se-SIRAS data measured with Cu Kalpha radiation. EAS contains 16 methionines and three cysteines in 455 amino acids. At a wavelength of 1.54 A (Cu Kalpha), the native (S-Met) and derivative (Se-Met) prote…
The automation of protein structure determination is an essential component for high-throughput structural analysis in protein X-ray crystallography and is a key element in structural genomics. This highly challenging undertaking relies at present on the availability of high-quality native and derivatized protein crys…
TlNiO 3 has been prepared under high oxygen pressure. This perovskite has been characterized by high-resolution neutron powder diffraction (NPD), Mössbauer spectroscopy, and magnetic measurements. The crystal structure was refined in the monoclinic P 2 1 / n space group, containing two crystallographic sites for Ni 3+…
Abstract Motivated by recent experiments (Spontak, R. J.; Smith, S. D. J Polym Sci Part B: Polym Phys 2001, 39, 947) on morphological and mechanical properties of multiblock copolymers (AB) n , we theoretically elucidate the links between microscopically determined properties, such as the bridging fraction of chains,…
Abstract The structural properties of poly(vinyl acetate) (PVAc) films filled with different levels of MgBr 2 or MgCl 2 were investigated. Differential scanning calorimetry revealed that, at certain filling levels of MgBr 2 or MgCl 2 , two new transitions appeared. The first one was due to the α relaxation ( T α ) ass…
The third generation of novel photo-responsive water-soluble stilbene dendrimer (trans- and cis-G3 WSD) undergoes unusual one-way trans-to-cis isomerization to give 100% of cis isomer at the photostationary state on UV irradiation in water.
It is hypothesized that surface residues with high conformational entropy, specifically lysines and glutamates, impede protein crystallization. In a previous study using a model system of Rho-specific guanine nucleotide dissociation inhibitor (RhoGDI), it was shown that mutating Lys residues to Ala results in enhanced…
An important component of a fully automated system for structure solution and phase improvement through density modification is a capability for identification of non-crystallographic symmetry as early in the process as possible. Algorithms exist for finding NCS in heavy-atom sites, but currently require of the order…
Based on a recently ascertained understanding of the parameters that control flame generated deposition of Na 2 SO 4, NaCl, or Na 2 CO 3 onto cooled surfaces immersed in flames, a new process has been developed to inhibit their formation. It is seen that no alkali sulfate is formed if tungsten salts are added to a fla…
The intensely sweet protein thaumatin has been crystallized at 293 K in the presence of sodium tartrate and 25%(v/v) glycerol for X-ray diffraction data collection at 100 K. A comparison of the three-dimensional structure model derived from a crystal grown in the presence of glycerol with that of a control deprived of…
Epitaxially grown heterostructures consisting of alternating layers of ${\mathrm{LaMnO}}_{3}$ (LMO, 9 or 15 unit cells) and ${\mathrm{SrMnO}}_{3}$ (SMO, 4 or 6 unit cells) on a ${\mathrm{SrTiO}}_{3}(100)$ (STO(100)) substrate have been studied by a combination of high resolution transmission electron microscopy (HRTEM…
Statistical density modification is a technique for phase improvement through a calculation of the posterior probability of the phases, given experimental phase information and expectations about features of the electron-density map. The technique can take advantage of both estimates of electron density in the map and…
Abstract PFPE‐ b ‐PVDF and PFPE‐ b ‐poly(VDF‐ co ‐HFP) block copolymers [where PFPE, PVDF, VDF, and HFP represent perfluoropolyether, poly(vinylidene fluoride), vinylidene fluoride (or 1,1‐difluoroethylene), and hexafluoropropylene] were synthesized by radical (co)telomerizations of VDF (or VDF and HFP) with an iodine…
Electroconvection in an unusual nematic compound with strongly positive dielectric anisotropy and negative anisotropy of the conductivity is investigated. For homeotropic alignment, where one has a direct transition to rolls or squares depending on the frequency of the applied voltage, we present a quantitative theory…
GDP-D-mannose 4,6-dehydratase catalyzes the first step in the de novo synthesis of GDP-L-fucose, the activated form of L-fucose, which is a component of glycoconjugates in plants known to be important to the development and strength of stem tissues. We have determined the three-dimensional structure of the MUR1 dehydr…