Air and moisture stable covalently-bonded tin(ii) coordination polymers.

Four covalently-bonded tin(ii) coordination polymers, (1)-(4), were hydrothermally prepared in aqueous alkaline media by the reactions of SnSO4 with 1,2,4,5-benzenetetracarboxylic acid (1), 1,3,5-benzenetricarboxylic acid (2), 4-hydroxypyridine-2,6-dicarboxylic acid (3), and 1,3,5-cyclohexanetricarboxylic acid (4). All products were structurally authenticated by single-crystal X-ray diffraction, and the number of different tin centres and their oxidation states were confirmed by 119Sn Mössbauer spectroscopy. In addition, the comparison between experimental and simulated X-ray powder diffraction patterns confirmed the authenticity of the samples. Our crystallographic results for (1)-(4) show that the Sn(ii) centres are tetracoordinated and exhibit distorted disphenoidal geometries, corroborating the presence of one stereochemically active lone electron pair at each metal site. Products (1) and (2) display bi-dimensional polymeric structures, (3) exhibits a one-dimensional architecture, whereas (4) shows a remarkable three-dimensional coordination network. Hirshfeld surface and supramolecular analyses for the repeating units of (1)-(4) were also performed in order to identify structurally important non-covalent interactions.

[Leptospirosis after a staff outing]. / Leptospirose-Erkrankungen nach einem Betriebsausflug.

HISTORY AND CLINICAL FINDINGS: Three male colleagues aged between 34 and 38 years were admitted at the same time to three different Rhein-Main area Hospitals. They presented with a variety of symptoms, including high fever (39.0 to 40.0 degrees C), chills, headache with meningismus or facial paralysis, mild hepatitis and renal involvement. About 18 days before they had been together on a boat rafting tour when the boat capsized when they had fallen into a river in high flood. INVESTIGATIONS: Laboratory tests showed elevated inflammatory parameters, signs of a mild hepatitis and renal involvement. All patients had leptospirosis antibodies, detected by immunofluorescence test. In two cases there was evidence of antibodies against Leptospira interrogans serovar bataviae in the microscopic agglutination test (MAT). TREATMENT AND COURSE: The history and clinical presentation indicated leptospirosis in all patients, in two cases confirmed by laboratory findings. Following therapy with doxycycline or ceftriaxone, symptoms resolved quickly and permanently. CONCLUSION: Leptospires of serogroup Bataviae is a known pathogen of anicteric non-Weil leptospirosis. The symptoms are non-specific and, moreover, in some cases the laboratory tests are negative, so that clinical diagnosis remains crucial. Typically there is a history of contact with contaminated water or urine. In our cases striking neurotropism was observed, which may be characteristic for this serovar.

A fast-scanning heterodyne receiver for measurement of the electron cyclotron emission from high-temperature plasmas.

We have developed a fast-scanning heterodyne receiver into a plasma diagnostic that measures the fundamental cyclotron emission from the PLT plasma and thus ascertains the time evolution of the electron temperature profile. The receiver scans 60-90 GHz every 10 ms and is interfaced to a computer for completely automated calibrated temperature measurements.