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  • 1
    Electronic Resource
    Electronic Resource
    Conductivité électrique totale de sels doubles de type iodure d'argent—polydiiodure de N pentylène N′ alkylène tétraméthyl N, N, N′, N′, diammonium (1986)
    Springer
    Journal of applied electrochemistry 16 (1986), S. 505-512 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Abstract Ionenes with the formula {[NMe2(CH2)5NMe2(CH2) n ]2I}p (where Me=methyl group;n=3, 4, 5; andp the degree of polymerization) have been prepared. Their NMR and IR spectra are shown and discussed. When these compounds are associated with silver iodide they give conducting compounds which obey the Arrhenius law. The highest conductivity of the AgI−N-pentylene, N′-alkylene, N, N, N′, N′-tetramethyl diammonium polyiodide system, at 25°C, is 0.01 Ω cm−1, corresponding to a compound containing 80% of AgI equivalent. This study has been carried out with the purpose of achieving solid generators.
    Notes: Résumé Les ionènes de formule {[NMe2(CH2)5NMe2(CH2) n ]2I}p (avec Me=radical méthyl;n=3, 4, 5; etp le degré de polymérization) ont été préparés. Leur spectre RMN et IR est présenté et discuté. Associés à de l'iodure d'argent, ils donnent des composés conducteurs qui suivent la loi d'Arrhénius. Le système AgI-polydiiodure de N pentylène N′ propyléne tétraméthyl N, N, N′, N′ diammonium possède à 25°C une conductivité maximale de 0.01 Ω cm−1 pour une composition renfermant 80% en équivalent de AgI. Cette étude se place dans une perspective de mise au point de générateurs tout solide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01006845
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  • 2
    Electronic Resource
    Electronic Resource
    Interdisciplinary treatment in pediatric patients with malignant CNS tumors (2000)
    Springer
    Child's nervous system 16 (2000), S. 742-750 
    Details
    ISSN: 1433-0350
    Keywords: Keywords Pediatric brain tumor ; Malignant CNS tumors ; Multimodality treatment ; Chemotherapy ; Radiation therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Despite sophisticated surgical methods only a few pediatric CNS tumors can be controlled by operation alone. Therefore multimodality treatment regimens are needed to improve quality of life and survival, which is most important in malignant neoplasms. Since 1998 we have treated 16 children with malignant CNS tumors. All 16 patients have been treated on an interdisciplinary basis and are therefore accompanied by a pediatric neuro-oncology group consisting of a neurosurgeon, pediatric oncologist, and radiotherapist. Depending on tumor histology, child"s age, and extent of surgery, further adjuvant therapy is planned by this group. Newly diagnosed tumors are typically treated by a specific chemotherapy protocol according to a multi-institutional study. In recurrent tumors more individual treatment regimens are considered. Data concerning surgery, adjunctive treatment, complications, and outcome of all patients and four case reports are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003810000335
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  • 3
    Electronic Resource
    Electronic Resource
    Two Cases of Fulminant Mycoplasma pneumoniae Pneumonia within 4 Months (2000)
    Springer
    Infection 28 (2000), S. 180-183 
    Details
    ISSN: 1439-0973
    Keywords: Key WordsMycoplasma pneumoniae ; Pneumonia ; Complications ; Immunoblot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report the clinical course and diagnostic findings in two patients with life-threatening Mycoplasma pneumoniae (MP) pneumonia who were treated in the same hospital in the course of only 4 months. The patients were previously healthy adults, aged 31 and 37 years, respectively. In both of them severe complications occurred which coincided with the acute MP respiratory infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s150100050077
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  • 4
    Electronic Resource
    Electronic Resource
    Immunocytochemical evidence for intragranular processing of pro-opiomelanocortin in the melanotropic cells of the rabbit (1985)
    Springer
    Cell & tissue research 242 (1985), S. 365-370 
    Details
    ISSN: 1432-0878
    Keywords: Melanotrophs ; Immunogold technique ; Secretory vesicles ; γ3-MSH ; α-MSH ; Endorphins ; Rabbit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The immunogold technique, employing antisera with clear-cut specificities, was used to localise different processing stages of pro-opiomelanocortin (POMC) in rabbit melanotropic cells. While the antiserum against γ 3-MSH labelled all the secretory granules including intrasaccular condensations in the Golgi apparatus, antisera against α-MSH only labelled extra-Golgi secretory vesicles (SV). All extra-Golgi SV were likewise labelled with the three antisera against α-MSH used, despite their different specificities for the desacetylated, N-acetylated or C-amidated forms of the peptide. The antibody against β-endorphin also labelled the extra-Golgi SV, while only some SV were labelled with the antibody against γ-endorphin. These results correlate with biochemical data in favour of mainly — if not exclusively — intragranular processing of POMC. Except for γ3-MSH, the cleavage of which could coincide with Golgi packaging of secretory material, other post-translational modifications of the precursor seem to occur when SV are discharged outside the Golgi area. The cleavage of γ-endorphin appears to be a later step in POMC processing, occurring in some mature SV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214549
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  • 5
    Electronic Resource
    Electronic Resource
    Liver uptake of 99mTc-labeled diphosphonate (DPD) by metastatic lesions from large bowel carcinoma (1985)
    Springer
    European journal of nuclear medicine 10 (1985), S. 467-468 
    Details
    ISSN: 1619-7089
    Keywords: 99mTc-DPD uptake ; metastases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Accumulation of 99mTc-diphosphonate was observed in 2 of 12 patients with liver metastases who had primary adenocarcinoma of the large bowel. The area of excessive radionuclide concentration corresponded well to the location of the hepatic metastases. The literature on this subject is reviewed and a possible mechanism of radionuclide accumulation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256594
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  • 6
    Electronic Resource
    Electronic Resource
    The effects of different fixatives for immunofluorescent and immunoperoxidase localization of Factor VIII-related antigen in canine carotid artery and vascular prostheses (1986)
    Springer
    Journal of molecular histology 18 (1986), S. 351-356 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The evaluation of vascular grafts seeded with autologous endothelial cells requires a reliable method of endothelial cell identification. Previous attempts to identify positively tissue Factor VIII-related antigen, found in relatively large amounts in vascular endothelial cells, proved to be inconsistent when immunoperoxidase and immunofluorescent staining techniques were tried. Because the Factor VIII antigen is very labile, this study was performed to determine an optimal fixation technique for demonstrating this antigen in frozen sections of endothelial tissue. Unfixed, acetone-fixed, and formalin-fixed sections of canine carotid artery as well as vascular grafts fixed in 1-ethyl-3-(3-diaminopropyl)-carbodiimide were examined by an indirect immunofluorescence technique. Also, the immunoperoxidase method of Factor VIII identification was applied to unfixed, acetone-fixed, and carbodiimide-fixed endothelial cell seeded vascular grafts. Acetone was the preferred fixative, resulting in excellent antigen preservation with minimal background staining. The immunoperoxidase technique of Factor VIII-related antigen identification was found to be the method of choice because of its sensitivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01675215
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  • 7
    Electronic Resource
    Electronic Resource
    Oxytocin-immunoreactive nerve fibers in the pars intermedia of the pituitary in the rabbit and hare (1983)
    Springer
    Cell & tissue research 228 (1983), S. 255-263 
    Details
    ISSN: 1432-0878
    Keywords: Pars intermedia ; Oxytocin ; Dopamine ; Serotonin ; Immunocytochemistry ; Rabbit, hare
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pars intermedia of the pituitary in the rabbit and hare is abundantly innervated by axons reacting selectively with antibodies against oxytocin. These axons contain dense secretory vesicles about 140 nm in diameter, i.e., smaller than those in the neurosecretory axons of the neural lobe. No fiber elements staining for other peptides (vasopressin, somatostatin, substance P) were observed in the pars intermedia, except rare leu-enkephalin axons restricted to the rostral zone of the gland. Dopaminergic innervation appears to be completely absent from the intermediate lobe. This was shown by the lack of reaction with an antibody against tyrosine-hydroxylase, which did reveal a well-developed tubero-infundibular system of nerve fibers. Axons reacting with an antibody against serotonin were irregularly distributed in the pars intermedia. In the absence of dopaminergic axons, the extensive oxytocin-like innervation may play a major role in regulating the melanotrophic cell activity in the Leporidae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204877
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  • 8
    Electronic Resource
    Electronic Resource
    Korrosionsreaktiorren von elementarem Schwefel mit unlegiertem Stahl in wäßrigen Medien (1984)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 35 (1984), S. 556-565 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion reactions between elemental sulphur and plain carbon steel in aqueous mediaPlain carbon steels are rather severely attacked by elemental sulphur at room temperature in the presence of aqueous media. The corrosion occurs preferentially at the places where the two solid substances iron and sulphur are in contact with each other and results in shallow pit formation. At the same time the pH is also decreased slightly and small amounts of H2S and sulphate ions are formed. Neutral salts stimulate the corrosion process whereas phosphates inhibit it and the alkaline media such as Na2CO3 and ethylamine with pH 〉 12 prevent it completely. The latter can be made use of for corrosion protection. At high salt concentrations (c 〉 1 mol/l) the corrosion rate, however, decreases with increasing salt concentration. The corrosion rate may increase with increasing flow velocity of the medium, but the corrosion takes place uniformly.The results of electrochemical investigations show that the reduction of sulphur occurs at the corrosion product FeS and is the rate controlling step. No sulphur reduction is observed on platinum electrodes when no FeS is present. It is assumed that the starting reaction to initiate corrosion in the system Fe/S/H2O is a slight disproportionation of S to H2SO4 resulting in the formation of FeS.
    Notes: Unlegierter Stahl wird durch elementaren Schwefel in Gegenwart wäßriger Medien bei Raumtemperatur verhältnismäßig stark angegriffen. Die Korrosion erfolgt bevorzugt an den Berührungsstellen der Feststoffe Fe und S unter Muldenbildung. Gleichzeitig erfolgen eine geringe pH-Absenkung sowie eine geringfügige Bildung von H2S und Sulfat-Ionen. Der Vorgang wird durch Neutralsalze sehr stark stimuliert, durch Phosphate inhibiert und durch alkalische Medien, wie z. B. Na2CO3 und Ethylamin mit pH 〉 12, völlig unterbunden. Dies kann zum Korrosionsschutz genutzt werden. Mit zunehmender Salzkonzentration (c 〉 1 mol/l) nehmen die Abtragungsraten wieder ab. Durch zunehmende Strömungsgeschwindigkeit können die Abtragungsraten zunehmen, wobei aber nur gleichförmiger Flächenangriff auftritt.Elektrochemische Untersuchungen zeigen, daß die Reduktion des Schwefels am Korrosionsprodukt FeS stattfindet und für die Korrosion geschwindigkeitsbestimmend ist. An Pt-Kathoden wird bei Abwesenheit von FeS keine Schwefelreduktion beobachtet. Als Startreaktion für die Korrosion im System Fe/S/H2O wird eine geringe Disproportionierung des S zu H2SO4 angenommen, wobei FeS entsteht.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19840351204
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  • 9
    Electronic Resource
    Electronic Resource
    Säureinhibitoren. III. Einfluß von quartären Ammoniumsalzen auf die Wasserstoffaufnahme von unlegiertem Stahl in H2S-freier und H2S-gesättigter Ameisensäure (1984)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 35 (1984), S. 107-110 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Acid inhibitors. II. Influence of quarternary ammonium salts on the hydrogen absorption of mild steel in H2S-free and H2S-saturated formic acidThe influence of quaternary ammonium compounds (benzylpyridinium chloride, benzylquinolinium halides, p-dodecylbenzylquinolinium chloride, benzylisoquinolinium chloride, tri-n-butylbenzylammonium halides, benzyldabcolinium chloride) on the rate of metal dissolution and absorption of corrosion hydrogen in the metal was studied at mild steel in chloride containing 10% formic acid at 25 °C in the presence and absence of H2S. Generally the same effects were observed like in the system steel/hydrochloric acid. Depending on the kind of inhibitor the presence of H2S increased or decreased the efficiency of inhibitors to block the H-absorption. Regardless of the presence of H2S p-dodecylbenzylquinolinium chloride and benzylquinolinium iodide exhibited the best efficiencies in decreasing the rate of metal dissolution and inhibiting the H-absorption in the metal.
    Notes: Es wurde der Einfluß quartärer Ammoniumverbindungen (Benzylpyridiniumchlorid, Benzylchinoliniumhalogenide, p-Dodecylbenzylchinoliniumchlorid, Benzylisochinoliniumchlorid, Tri-n-butylbenzylammoniumhalogenide, Benzyldabcoliniumchlorid) auf das Abtragsverhalten und die Absorption von Korrosionswasserstoff im Metall beim Behandeln von unlegiertem Stahl mit chloridhaltiger 10%iger Ameisensäure bei 25 °C in Anwesenheit und Abwesenheit von H2S studiert. Grundsätzlich wurden ähnliche Effekte wie im System Stahl/ Salzsäure gefunden. H2S-Anwesenheit wirkte sich je nach Inhibitorsubstanz günstig oder ungünstig auf die Kinetik der H-Absorption aus. p-Dodecylbenzylchinoliniumchlorid und Benzylchinoliniumchlorid zeigten unabhängig von der H2S-Anwesenheit die besten Hemmwerte sowohl bei der Metallauflösung als such bei der Absorption von Korrosionswasserstoff.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19840350303
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  • 10
    Electronic Resource
    Electronic Resource
    Säureinhibitoren. II. Einfluß von quartären Ammoniumsalzen auf die Wasserstoffaufnahme von unlegiertem Stahl in H2S-freier und H2S-gesättigter Salzsäure (1984)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 35 (1984), S. 99-106 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Acid inhibitors. II. Influence of quarternary ammonium salts on the hydrogen absorption of mild steel in H2S-free and H2S-saturated hydrochloric acidThe influence of organic ammonium salts (pyridine hydrochloride and its derivates, trialkylbenzylammonium halides, pyridines, quinolinium and isoquinolinium compounds quaternarized with benzyl halides and substituted benzyl chlorides) on the hydrogen absorption of mild steel treated with H2S-free and H2S-saturated 16% hydrochloric acid at 25 °C was studied using electrochemically controlled hydrogen permeation measurements. Investigations on structure-efficiency correlations revealed that the inhibitors can influence the kinetics of the hydrogen absorption and the rate of metal dissolution with significantly different efficiency. Describing the efficiency profil of acid inhibitors it is therefore necessary to test inhibitors in both respects. This is valid especially in the presence of H2S which can change the efficiency of inhibitors fundamentally.Besides by structural and electronic variations in the organic molecule the efficiency of the inhibitors tested was influenced by the type of anion (e.g. bromide, iodide). With benzylquinolinium chloride the best results were found in both H2S-free and H2S-saturated acid.
    Notes: Mit Hilfe elektrochemisch kontrollierter Wasserstoffpermeationsmessungen wurde der Einfluß organischer Ammoniumsalze (Pyridinhydrochlorid und Derivate, Trialkylbenzylammoniumhalogenide, mit Benzylhalogeniden und substituierten Benzylchloriden quaternärisierte Pyridine, Chinoline und Isochinoline) auf die Wasserstoffabsorption von unlegiertem Stahl beim Behandeln mit H2S-freier und H2S-gesättigter 16%iger Salzsäure bei 25 °C studiert. Untersuchungen zu Struktur-Wirkungsbeziehungen zeigten, daß die betrachteten Inhibitoren die Kinetik der Wasserstoffabsorption im Metall und die Geschwindigkeit der Metallauflösung durchaus unterschiedlich beeinflussen können. Daher müssen zur Beschreibung des Wirkprofils von Säureinhibitoren stets beide Einflußbereiche untersucht werden. Dies gilt vor allem in Anwesenheit von H2S, welches die Eigenschaften von Inhibitoren grundlegend verändern kann.Neben strukturellen und elektronischen Veränderungen im organischen Teil des Inhibitormoleküls zeigten auch Variationen des Anions (z. B. Bromid, Iodid) einen deutlichen Einfluß auf die Inhibitionswirkung. Mit Benzylchinoliniumchlorid wurden die besten Resultate sowohl in H2S-freier Säure als auch in Anwesenheit von H2S erhalten.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19840350302
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