In our series, abnormal placentation causing severe haemorrhage was the commonest indication for EPH. Previous CS is a risk factor for abnormal placentation and particularly for morbid adherence of the placenta. The morbidity associated with EPH is considerable.

The crystal and molecular structures of tetra-»-butyratodiruthenium chloride, R^CCbCCsI+hCl, have been determined using the intensities of 708 independent, statistically significant reflections collected with a counter diffract uneter. The compound crystallizes in the tetragonal space group I42d with unit cell dimensions a = 13.265 ± 0.005 A and c -24.453 ± 0.008 A (Pobsd = 1.76 ± 0.03 g cm-3 and poaiod = 1.81 g cm-3 forZ = 8). The structure, excluding hydrogen atoms, was solved using Patterson and Fourier methods and refined by full-matrix least-squares methods to a conventional unweighted residual of 7.3%. The compound contains the dinuclear, carboxylate-bridged species Ru2(02CC3H7)4 +with a very short Ru-Ru distance of 2.281 Á. This short bond length and the reported presence of three unpaired electrons on the cation may be rationalized in terms of molecular orbital theory. The two ruthenium atoms of a given molecule are equivalent by virtue of a crystallographic twofold axis and therefore, barring disorder, for which we find no evidence, exist in thé common, nonintegral oxidation state of +2.5. Chloride ions bridge adjacent dinuclear cations in the crystal to form infinite zigzag chains parallel to the a and b crystallographic axes.

BackgroundMatrix-metalloproteinases (MMPs) are proteolytic enzymes that can degrade the extra cellular matrix and drive tissue remodelling, key processes in the pathogenesis of COPD. The development of small airway disease has been identified as a critical mechanism in the early development of airflow obstruction but the contribution of MMPs in human disease is poorly characterised.

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Trigonal-Prismatic vs. Octahedral Coordination in a Series of Tris (benzene-1,2-dithiolato) Complexes. 1. Crystal and Molecular Structure of Tris(benzene-1,2-dithiolato)molybdenum(VI), MoiSiCsHU)31