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  • 1
    Electronic Resource
    Electronic Resource
    Hemorrhage in pituitary adenoma: correlation of MR imaging with operative findings (1998)
    Springer
    European radiology 8 (1998), S. 971-976 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Pituitary adenoma ; MR imaging ; Hemorrhage ; Cyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was to correlate MR imaging and operative findings of hemorrhage in pituitary macroadenomas. We retrospectively reviewed MR images of 113 surgically proven pituitary adenomas. All patients were examined on a 1.5-T MR system. The intensity of intratumoral cystic cavities was correlated with operative findings. In 15 patients with pituitary apoplexy, we determined relationship between interval of MR examination after apoplectic event and MR signal intensity. In 8 patients with repeated preoperative MR examination, we evaluated sequential changes of intratumoral hemorrhage. There were 54 cavities at surgery: 52 were hemorrhagic and 2 were nonhemorrhagic. Twenty-nine of 52 hemorrhagic cysts demonstrated high/low signal (H/L) fluid–fluid levels on T2-weighted image (T2WI). In 19 of them, two components could be separately seen at operation: the supernatant high-intensity area represented xanthochromic fluid, and the dependent low-intensity area represented liquefied hematoma. The H/L fluid–fluid level was observed predominantly in hematomas on MR images obtained after longer intervals. In patients with repeated MR examination, follow-up MR imaging revealed additional hemorrhage or new formation of fluid–fluid levels. It was surprising that 12 of 14 cysts preoperatively judged as nonhemorrhagic in fact contained hemorrhagic components. The preoperative MR images are well correlated to the operative findings in hemorrhagic pituitary macroadenomas. It proved that 52 of 54 cystic cavities had hemorrhagic component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050498
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal investigation of some heterocyclic ligand complexes of tin(IV) in the solid state (1991)
    Springer
    Journal of thermal analysis and calorimetry 37 (1991), S. 2621-2629 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden 1,10-Phenanthrolin- (Phen), 2,2′-Bipyridyl- (Bipy), Pyridin- (Py) und 4-Picolin- (4-Pic) Komplexe von Dibutylzinndichlorid (Bu2SnCl2) und Dimethylzinndichlorid (Me2SnCl2) hergestellt. Die Komplexe wurden mittels Elementar-analyse, IR-Spektroskopie und Thermoanalyse charakterisiert. Die ermittelte Zusammensetzung der Komplexe war [Bu2SnCl2·Phen], [Bu2SnCl2·Bipy], [Me2SnCl2·Phen], [Me2SnCl2· Bipy], [Me2SnCl2·2Py] und [Me2SnCl2·2(4-Pic)]·H2O. All diese Verbindungen scheinen eine oktaedrische Struktur zu besitzen. Unter Anwendung einiger Standardmethoden wurden für die Dehydratation und die Sublimation der Komplexe einige thermodynamische Parameter, wie z.B. die AktivierungsenergieE a, die Enthalpieänderung ΔH und die EntropieänderungΔS ermittelt.
    Notes: Abstract 1,10-phenanthroline (phen), 2,2′-bipyridyl (bipy), pyridine (py) and 4-picoline (4-pic) complexes of dibutyltindichloride (Bu2SnCl2) and dimethyltindichloride (Me2SnCl2) were synthesized. The complexes were characterized with the help of elemental analyses, IR spectra and thermal analyses. The complexes were found to have the compositions [Bu2SnCl2·phen], [Bu2SnCl2·bipy], [Me2SnCl2·phen], [Me2SnCl2·bipy], [Me2SnCl2·2py] and [Me2SnCl2·2(4-pic)]·H2O. All these complex compounds appeared to posses octahedral structures. Thermodynamic parameters, such as activation energyE a * enthalpy change ΔH and entropy change ΔS, for the dehydration and sublimation of the complexes were evaluated using some standard methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912807
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    Paper (German National Licenses)
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