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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 58 (1980), S. 395-402 
    ISSN: 1432-1440
    Keywords: Obstructive airway disease ; Localisation of the receptors ; Fenoterol ; Localisation of the effect of β-receptor-stimulation ; Ascaris suum-anti-gen ; Atemwegsobstruktion ; Receptorenlokalisation ; Fenoterol ; Wirkort der β2-Receptorenstimulatoren ; Ascaris suum-Antigen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei gegen Ascaris suum-Extrakt überempfindlichen Hunden kann eine Atemwegsobstruktion sowohl vom oberen als auch vom unteren Teil des Atemtraktes her ausgelöst werden. Fenoterol als β2-Receptorenstimulator vermindert diese Reaktion durch Aerosol-Applikation sowohl an dem oberen als auch an dem unteren Teil des Atemtraktes. Der durch Belegung des oberen Teils des Atemtraktes erzielte Effekt ist viel stärker und länger anhaltend als derjenige, der von den unteren Abschnitten oder bei intravenöser Gabe zu erzielen ist. Ein direkter Effekt des β2-Receptorenstimulators am sensorischen Teil des Reflexweges der Reflexbronchokonstriktion ist anzunehmen. Auch sprechen die Ergebnisse dafür, daß nach Fenoterolbelegung der oberen Atemwege auch die im unteren Atemtrakt auslösbaren Bronchokonstriktionen zu beeinflussen sind. Dieser Effekt muß nicht resorptiv-systemisch sein. Für die Klinik ist weiter zu prüfen, welche Rolle in der Pathogenese wie in der Behandlungsfähigkeit die verschiedenen Bereiche des Respirationstraktes für individuelle Formen der Atemwegsobstruktion spielen.
    Notes: Summary On dogs sensitive against Ascaris suum extract an increase of the airway resistance can be caused by challenge alone on the upper part or the lower part of the airways by Ascaris suum extract. Fenoterol as β2-receptor stimulator is capable to decrease this reaction by deposition of this drug on the upper part as on the lower part of the airways. The effect of Fenoterol on the upper part of the airways is much stronger and lasts much longer than on the lower part of the airways or by intravenous route. A direct effect of the β2-receptor stimulator Fenoterol on the sensoric part of the reflex way of the reflex bronchoconstriction must be considered. It will be also discussed that the local application of Fenoterol on the upper part of the airways may influence also the reaction of the bronchial muscles in the lower part of the airways without a direct resorptive-systemic effect. The relationship of these findings for the clinical situation on man has to be investigated.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 34 (1947), S. 373-373 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2013-06-12
    Description: We recently described a family of cationic antimicrobial peptides (CAMPs) selected from a combinatorial library that exhibited potent, broad-spectrum activity at neutral pH and low ionic strength. To further delimit the utility and activity profiles of these peptides, we investigated the effects of solution conditions, such as pH and ionic strength, on the efficacy of the peptide antimicrobials against a panel of microorganisms. Peptide minimum sterilizing concentrations (MSCs) varied linearly with pH for each subtype within our family of CAMPs for all organisms tested. The peptides were much less effective against Gram-negative bacteria at high pH, consistent with a decrease in net positive charge on the peptides. A similar trend was observed for the fungus Candida albicans . Surprisingly, the opposite pH trend was observed with the Gram-positive Staphylococcus aureus . In addition, an additive ionic strength effect was observed with increasing buffer strengths at identical pH values. The extreme difference in the observed pH behavior between Gram-negative and Gram-positive organisms is attributed to the presence of native charged molecules in the much thicker peptidoglycan layer of the Gram-positive organism. The novel species-specific effects of pH observed here have important implications for applications using CAMPs and for the design of novel CAMPs.
    Print ISSN: 0066-4804
    Electronic ISSN: 1098-6596
    Topics: Biology , Medicine
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