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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of chemical ecology 16 (1990), S. 1565-1576 
    ISSN: 1573-1561
    Schlagwort(e): Nicotiana ; Solanaceae ; Peronospora tabacina ; blue mold ; Alternaria alternata ; leaf surface chemistry ; diterpenes ; sucrose esters ; hydrocarbons ; spore germination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Chromatographic procedures were utilized to isolate and purify components of tobacco cuticular extracts and leaf surface chemicals.In vitro microbial bioassays determined the influence of these leaf surface compounds on germination and germ tube morphology ofP. tabacina sporangia, the tobacco blue mold pathogen, and to a lesser extentAlternaria alternata, the tobacco brown spot pathogen. Exposure to 10 μg/cm2 of α- and β-duvatrienemonols, sucrose esters, or hydrocarbons did not inhibit germination, whereas germination was significantly decreased bycis-abienol.cis-Abienol did not inhibit sporangial germination when combined with sucrose esters or hydrocarbons at a combined 10 μg/cm2. Germination of sporangia was completely inhibited by α- and β-duvatrienediols. In contrast to a previous report, α-DVT-diol was more inhibitory than the β isomer. Toxic effects of the DVT-diols were not altered by pH. Diluting the DVT-diols to less than 0.1 μg/cm2 resulted in a small but significant stimulation of germination. Previously, the DVT-diols had been identified only as inhibitory toP. tabacina. None of the leaf surface chemicals affected germination ofA. alternata conidia.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1573-2568
    Schlagwort(e): ALOSETRON ; 5-HT3 RECEPTOR ANTAGONIST ; IRRITABLE BOWEL SYNDROME ; VISCERAL NOCICEPTION ; RECTAL DISTENSION
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Irritable bowel syndrome (IBS) represents one ofthe most common gastrointestinal-related diagnoses.Although the precise etiologic basis of IBS is notknown, a common presenting symptom is abdominal pain or discomfort that is thought to develop, atleast in part, from a heightened awareness of visceralnociceptive input. Agents capable of reducing thisheightened visceral nociception would, therefore, have utility in the treatment of IBS. In this studywe evaluated the effects of intravenous andintracerebroventricular administration of a5-HT3 receptor antagonist, alosetron, onblood pressure changes associated with rectal distension in anesthetized andawake dogs. This vasoactive reflex serves as a model forvisceral nociception. For intracerebroventricularstudies, the cerebroventricular guides were placed over the lateral ventricle. In anesthetized studies,blood pressure was measured by femoral arterycannulation. In awake studies, blood pressure wasmonitored by noninvasive measurement. A rectal balloonwas placed in the rectum of each dog and maintainedthroughout the experiments. Each dose of alosetron wasgiven to the dogs as an intravenous orintracerebroventricular bolus, and every 30 min therectal balloon was inflated and blood pressure responsesobserved. In both anesthetized and awake dogs alosetronproduced a significant inhibition of the vasoactivereflex. In particular, alosetron showed high potency when administered intracerebroventricularly.Alosetron, administered either centrally orperipherally, appears to modulate the visceralnociceptive effect of rectal distension indogs.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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