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The morphology of sodium partially and totally neutralized carboxytelechelic ionomers has been characterized by small-angle X-ray scattering showing that the aggregates grow as more end chains are neutralized while keeping the electron density constant, in agreemeent with the multiplet model.
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The variation of the atomic scattering factor near the X-ray absorption edge of an element can be an important tool for determining the distribution of that element in any sample. For defining experimentally the possibilities of anomalous small-angle X-ray scattering (ASAXS) in metallurgy, three compositions of a phase-separated aluminium-zinc alloy have been studied at different energies below the Zn-absorption edge, using a synchrotron radiation source. In order to test the reliability of these measurements and of the data treatment, the variation of f', the real part of the scattering factor, has been measured with a precision comparable to that of more direct measurements.
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Apo and ligand-bound forms of the cytoplasmic molybdate-binding protein ModG from A. vinelandii have been crystallized in space groups P6322 and P321, respectively. X-ray data were collected on both forms to a maximum resolution of 2.0 Å.