Optimum X-ray wavelength for protein crystallography
If the diffraction pattern from crystalline proteins is recorded with shorter wavelengths than is customary the radiation damage may be reduced and absorption corrections become less important.
Materials Literature
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Investigation of the chain conformation in uniaxially stretched poly(dimethylsiloxane) networks by small-angle neutron scattering
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the chain conformation in uniaxially stretched poly(dimethylsiloxane) networks by small-angle neutron scatteringMichel Beltzung, Claude Picot, and Jean HerzCite this: Macromolecules 1984, 17, 4, 663–669Publication Date (Print):April 1, 1984Publication Histor…
[Cu12S8]4⊖: A Closed Binary Copper(I) Sulfide Cage with Cuboctahedral Metal and Cubic Sulfur Arrangements
As the largest CuS cluster known to date, [Cu12S8]4⊖ occupies a special position. It is the first copper(I) complex containing exclusively sulfidic ligands that has been isolated. The Ph4P salt is formed on reaction of CuCl2·2H2O with EtS⊖ and Li2S in the presence of Ph4PBr.
Kinetics of the complexation of iron(II) with ferrozine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the complexation of iron(II) with ferrozineJames C. Thompsen and Horacio A. MottolaCite this: Anal. Chem. 1984, 56, 4, 755–757Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pubs.acs.org/do…
Acetals as crosslinking reagents for cotton
Acetals that react with cotton to form cellulose crosslinks are derived from dialdehydes that can form five-or-six-membered tetrahydrofuran or tetrahydropyran rings. These aldehydes themselves are reactive to cotton, but the acetals do not form the aldehyde to react. The acetals were less reactive than the aldehydes a…
Grain structure variation with temperature for evaporated metal films
Metallic films are today used in various technological applications. The grain structures of these films influence many properties including the hardness, corrosion resistance, and the electrical conductivity reactivity of thin films in electrical devices. It is therefore important to understand how the films grow and…
Etching of diamond with argon and oxygen ion beams
The angular dependences of the sputter yield of (100) single crystal diamond under argon and oxygen ion beams were investigated. For argon ion beams a large increase in the sputter yield was observed as the angle of incidence was increased from the normal, with a maximum occurring at approximately 60° from the normal.…
Electron-impact-excitation cross sections for electronic levels in neon for incident energies between 25 and 100 eV
Absolute differential cross sections (DCS's) for electron-impact excitation of the lowest forty electronic levels in atomic neon have been determined for incident electron energies of 30 and 50 eV, for the four lowest levels at 25 eV, and two levels at 100 eV. The cross sections for these forty electronic levels are g…
An x-ray photoelectron and electron energy loss study of the oxidation of lead
Lead–oxygen compounds and the exposures of clean polycrystalline Pb0 to O2, H2O, and air at various temperatures have been studied with x-ray photoelectron (XPS) and electron energy loss (EELS) spectroscopies. Results indicate that the shape of the Auger O KVV lines and EELS are sufficiently different to distinguish P…
Hard‐segment polymorphism in MDI/diol‐based polyurethane elastomers
Abstract X‐ray analyses of methylene‐bis(4)phenyl isocynate(MDI)/diol/poly(tetramethylene adipate) polyurethane elastomers prepared using hexanediol (HDO), butanediol (BDO), and propanediol (PDO) point to the development of a second crystalline structure in the hard segments as a result of thermal elongation and annea…
Magnetoelectric susceptibility and magnetic symmetry of magnetoelectrically annealed TbPO4
Measurements are presented of the magnetoelectric (ME) susceptibility tensor $\stackrel{\ensuremath{\leftrightarrow}}{\ensuremath{\alpha}}$ of TbP${\mathrm{O}}_{4}$ crystals which were ME annealed by a method introduced in the present paper and termed "balanced" ME annealing. The form of $\stackrel{\ensuremath{\leftri…
Strengths of the mechanical α, β- and γ-relaxation processes in linear polyethylene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrengths of the mechanical α, β- and γ-relaxation processes in linear polyethyleneRichard H. BoydCite this: Macromolecules 1984, 17, 4, 903–911Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pubs.acs.…
The peak in neutron powder diffraction
For the application of Rietveld profile analysis to neutron powder diffraction data a precise knowledge of the peak profile, in both shape and position, is required. The method now in use employs a Gaussian-shaped profile with a semi-empirical asymmetry correction for low-angle peaks. The integrated intensity is taken…
The Role of the Lower Metal Oxide/Higher Metal Oxide Couple in Oxygen Evolution Reactions
The minimum potential for the evolution of oxygen on six oxides ( RuO 2 Li 0.1 Ni 0.9 O , Li 0.3 Co 2.7 O 4 , IrO 2 , PbO 2 , and PtO 2 ) in 5 N KOH has been studied by potentiostatic steady‐state and galvanostatic charging experiments. The results show that there is an excellent correlation between the minimum potent…
Subnanogram detection of dyes on filter paper by surface-enhanced Raman scattering spectrometry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubnanogram detection of dyes on filter paper by surface-enhanced Raman scattering spectrometryChieu D. TranCite this: Anal. Chem. 1984, 56, 4, 824–826Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pu…
A Coolability Model for Postaccident Nuclear Reactor Debris
A one-dimensional model is developed for boiling heat removal and dryout in particulate debris. The model can be used for predicting the coolability of postaccident debris from a nuclear reactor (either light water or liquid-metal fast breeder). The model includes the effects of both laminar and turbulent flow, two-ph…
Physical and electrochromic properties of the amorphous and crystalline tungsten oxide thick films prepared under reducing atmosphere
The physical and electrochemichromic properties of the amorphous and crystalline tungsten oxide films prepared by thermal evaporation of WO3 powder under a reducing atmosphere have been investigated. The oxide films with 850–24 500 Å thick were deposited on the substrates maintained at a temperature ranging from 50 to…
The Formation of Magnesium Oxychloride Phases in the Systems MgO‐MgCl 2 ‐H 2 O and NaOH‐MgCl 2 ‐H 2 O
The reactions leading to the formation of crystalline Mg 3 (OH) 5 Cl·4H 2 O (phase 5), Mg 2 (OH) 3 ,Cl·4H 2 O (phase 3), and Mg(OH) 2 are compared for the systems MgO‐MgCl 2 ‐H 2 O and NaOH‐MgCl 2 ‐H 2 O. The crystalline phases were determined by X‐ray diffraction analysis. The concentration of the total magnesium and…
Breakdown of Passivity of Nickel by Fluoride: II . Surface Analytical Studies
Passive layers on nickel and their change by the action of fluoride have been studied by surface analyses such as x‐ray photoelectron spectroscopy (XPS) and low energy ion scattering (ISS). The thickness of the layers is deduced from the height of the XPS signals Ni 2 p 3 / 2 , O1s, and F1s and their attenuation by co…
Interactions of halloysites with amides: mineralogical factors affecting complex formation
Abstract Complex formation between halloysites, from soil and geological sources, and a series of amides has been investigated. All the amides used can be intercalated to give single-layer complexes with basal spacings between 10·4 Å (for formamide) and 12·4 Å (for N,N -dimethylacetamide). When the interlayer space of…