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We have studied the "$5f$, $6d$" electron states of the system $\mathrm{U}{\mathrm{Sb}}_{x}{\mathrm{Te}}_{1\ensuremath{-}x}$ (100) using photoemission spectroscopy with synchrotron radiation. In contrast with the generally accepted picture of uranium chalcogenides and pnictides, we find for UTe that the main $5f$ leve…
Neural tubes whose neural crest had just begun migration were isolated from stage-14 chick embryos, cleaned with 0.1% trypsin, and cultured in transparent hydrated collagen lattices (HCL) in an effect to stimulate in part the three-dimensional environment through which neural crest cells migrate in situ, in the embryo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe permethylcyclosilanes (Me2Si)5 through (Me2Si)35Lawrence F. Brough and Robert WestCite this: J. Am. Chem. Soc. 1981, 103, 11, 3049–3056Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published inissue 1 June 1981https://doi.org/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactivity of the [(.eta.5-C5H5)Ti(Mo5O18)]3- anion: synthesis and structure of MoO2Cl+ and Mn(CO)3+ adductsV. W. Day, M. F. Fredrich, M. R. Thompson, W. G. Klemperer, R. S. Liu, and W. ShumCite this: J. Am. Chem. Soc. 1981, 103, 12, 3597–3599Publication Date (Print):June 1,…
Abstract Elastomeric networks were prepared by end‐linking vinyl‐terminated polydimethylsiloxane (PDMS) chains having number‐average molecular weights of 11.3 × 10 3 g mol −1 . The tetra‐functional end‐linking agent, Si[OSi(CH 3 ) 2 H] 4 , was used in varying amounts smaller than that corresponding to a stoichiometric…
This paper provides the mathematical background on which the previous paper entitled: Determination of the Surface Tilt Angle by ATR, is based. The algebra was considered too lengthy to be incorporated as an appendix to that paper.
Abstract Interstratified kaolinite-smectite minerals form the major part of a pedon transitional between ‘red’ kaolinitic and black smectitic soils in a soil toposequence derived from basalt in Burundi, Central Africa. These interstratified kaolinite-smectites have many X-ray, morphological and chemical features in co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA monohydroxobridged, strongly antiferromagnetically coupled dicopper(II) center in a binucleating macrocycle. Comparisons with binuclear copper sites in biologyPeter K. Coughlin and Stephen J. LippardCite this: J. Am. Chem. Soc. 1981, 103, 11, 3228–3229Publication Date (Pri…
If a powder pattern consists of well resolved peaks, and if it is adequately described by a crystallographic model, as determined by statistical tests, the estimates of the parameters and their standard deviations will not be significantly different, in a statistical sense, whether the method of refinement uses peak p…
Oxygen self‐diffusion in MgAl 2 O 4 single crystals was investigated by annealing the samples in 18 O enriched gas at 98 kPa (1 atm) and measuring the tracer concentration profiles using a proton activation technique. The diffusion coefficients in the range 1625 to 1925 K for stoichiometric crystals are represented by…
Abstract Measurement of the equilibrium distribution of persistence length fragments of DNA in high concentration in the ultracentrifuge shows that the reduced osmotic pressure rises much faster than linearly. From analysis of the data in terms of the Zimm cluster integral we infer that the net interactions between he…
A previously developed theory of the magnetism of iron, based upon notion of a randomized exchange field, has now been applied to calculate the properties of nickel. We obtained a Curie temperature of 1200 K, about twice the observed value. The magnetization curve, the paramagnetic susceptibility (a Curie-Weiss law),…
A series of binary fluorozirconate glasses have been prepared in the ZrF4–BaF2 system, containing between 52–74 mol % ZrF4. Their infrared and polarized Raman spectra are reported for the first time, down to 33 cm−1. The glass transition and crystallization temperatures were also measured. The vibrational modes have b…
The complete amino acid sequence of the Escherichia coli alkaline phosphatase subunit [orthophosphoric-monoester phosphohydrolase (alkaline optimum), EC 3.1.3.1, isozyme 3] has been determined. The monomer contains 449 amino acid residues in a single unglycosylated polypeptide chain having a calculated Mr of 47,029. I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecomposition of .alpha.-aluminum hydride powder. 2. Photolytic decompositionP. J. Herley and O. ChristoffersonCite this: J. Phys. Chem. 1981, 85, 13, 1882–1886Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published inissue 1 June 1981htt…
Abstract Three new procedures are described for preparing HMX from hexamine, each involving acetylation followed by nitrolysis. One of these — involving DADN as intermediate — gives a better yield of HMX than the established Bachmann process on the basis of hexamine and acetic anhydride, but involves the use of sulfur…
Determination of the structure of biological particles, randomly oriented in solution, from spatial correlation analysis of fluctuations in x-ray scattering has recently been proposed. The feasibility of scattering fluctuation measurements was evaluated by using an x-ray synchrotron radiation camera to obtain the spat…
Isotropic tensors play an important role in the theory of many physical processes, which take place in gases and liquids. In such systems it is usually necessary to perform a rotational average on products of direction cosines relating the space-fixed and molecular coordinate frames. The average is generally expressib…
Kinematic and dynamic conditions for the existence, or otherwise, of viscous eddies due to point, ring or a line distribution of stokeslets near no-slip boundaries are investigated. Boundaries considered are (i) a single plane boundary, (ii) two parallel plane boundaries, (iii) an infinite cylinder, and (iv) a finite…
Abstract The microstructure of polyvinyl chloride (PVC) controls much of its processing and property behavior. A model put together from X‐ray diffraction and small‐angle scattering data, swelling data, and processing data shows that PVC crystallites, of a wide melting range and spaced at 0.01 micron, act as crosslink…