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  • 11
    Digitale Medien
    Digitale Medien
    Diversity and variation in expression of resistance to Erysiphe fischeri in Senecio vulgaris (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 42 (1993), S. 0 
    Details
    ISSN: 1365-3059
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: The reactions of 20 inbred lines of Senecio vulgaris (groundsel) to inoculation with up to 10 isolates of Erysiphe fischeri (powdery mildew) were investigated in a number of repeat experiments. There was considerable variation among isolate/plant line reaction phenotypes with examples of both isolate-specific complete resistance and isolate-specific partial resistance. Some plant lines possessed high levels of partial resistance to all isolates tested. Incubation temperature and plant age influenced the infection types of some isolate/plant line combinations. In this pathosystem, complete and partial resistance, together with age-dependent and temperature-dependent resistance, appear to have evolved to facilitate a defence strategy based on a complex mosaic of interacting factors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3059.1993.tb01545.x
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  • 12
    Digitale Medien
    Digitale Medien
    Resistance to Erysiphe fischeri in two populations of Senecio vulgaris (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 42 (1993), S. 0 
    Details
    ISSN: 1365-3059
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: The frequency and distribution of different specific phenotypes for resistance to Erysiphe fischeri was studied in two populations of the annual weed Senecio vulgaris (groundsel) one located in Glasgow, Scotland the other located about 480 km south at Wellesbourne, England. Progeny of individual plants from the two host populations were tested for their response to up to 10 different isolates of E. fischeri, five from each location; each isolate had a different specific virulence phenotype. Most plants in each sample were susceptible to all 10 isolates. The proportion of plants whose progeny were resistant to a particular isolate ranged from 1% to 10% with the exception of resistance to one isolate that occurred with a frequency of 37% at Wellesbourne. Overall, resistance to one or more of the 10 isolates appeared to be more common in the plant population sampled at Wellesbourne than at Glasgow. Of the total number of groundsel line/isolate combinations tested, 10% involving Wellesbourne plants and 2% involving Glasgow plants were incompatible, i.e. resistant/avirulent. Both groundsel populations tended to be dominated by one or two resistance phenotypes but they were nevertheless highly heterogeneous when less frequent resistance phenotypes were considered. This was particularly evident at Wellesbourne where 10 different resistance phenotypes were recorded amongst a total of 75 plants growing within an area of 1 m2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3059.1993.tb01544.x
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  • 13
    Digitale Medien
    Digitale Medien
    Variation for virulence in Erysiphe fischeri from Senecio vulgaris (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 42 (1993), S. 0 
    Details
    ISSN: 1365-3059
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Variation for virulence was investigated in two populations of Erysiphe fischeri, the cause of powdery mildew of the common annual weed Senecio vulgaris (groundsel). Infection types were recorded on detached leaf segments from 50 inbred lines of S. vulgaris following inoculation with 24 single-conidial-chain isolates of E. fischeri (12 each from two UK sites; one, at Glasgow, located about 480 km north of the other, at Wellesbourne). Mean infection types for each isolate/line combination were categorized by applying several upper limits below which combinations were considered to be incompatible. Regardless of the limit applied, numerous specific virulence and resistance phenotypes could be discriminated. Virulence phenotypes were complex and all isolates were capable of colonizing and reproducing on the majority of groundsel lines. However, all isolates were completely avirulent (no reproduction) on at least one groundsel line, so no isolate was universally virulent. Plants of several groundsel lines exhibiting different resistance phenotypes were exposed to natural infection at Wellesbourne to act as mildew traps, to examine the virulence characteristics of the pathogen population. Common components of the fungus population colonized groundsel lines exhibiting resistance to only a few or none of the single-conidial-chain isolates. Rarer components of the pathogen population colonized groundsel lines with resistance to the majority or all of the isolates previously tested. These latter components of the fungus population also detected resistance in groundsel lines previously recorded as susceptible to all isolates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3059.1993.tb01543.x
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  • 14
    Digitale Medien
    Digitale Medien
    Measurement and analysis of the reactionγγ→3π +3π - (1991)
    Springer
    The European physical journal 51 (1991), S. 531-540 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The reactionγγ→3π +3π - has been studied usig the JADE detector at PETRA. The topological cross sectionσ(γγ→3π +3π -) was measured in the CM energy range 1.5–5.5 GeV. The production ofρ 0,s was observed and the average number ofρ 0,s per event measured. The contributions of the subprocessesγγ→ρ 02π +2π -,γγ→ρ 0 ρ 0 π +2π - andγγ→ 3π +3π - (phase space) were studied and 95% C.L. upper limits for the cross sectionσ(γγ→ρ 0 ρ 0 π + π - determined. Finally the Bose-Einstein correlation for pairs of like signed pions was observed. A fit to a standard parametrization gave results consistent with other studies of this effect in pion systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01565577
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  • 15
    Digitale Medien
    Digitale Medien
    Reexamination of the thermolytic rearrangement of 4-halophenyl azides to 2-aminophenols and other products (1993)
    Springer
    Monatshefte für Chemie 124 (1993), S. 367-379 
    Details
    ISSN: 1434-4475
    Schlagwort(e): Acetylated-2-amino-5-halophenols ; 2-Acetamido-5-haloanisoles ; 6-Halo-2-methylbenzoxazoles ; 6-Halobenzoxazolones ; 6-Halotriacetylaminophenols ; 1H-NMR spectra ; Fungicidal activity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Es wurde die Halogenierung von 2-Aminophenol-Derivaten mit N-Chlor- und N-Bromsuccinimid bei Raumtemperatur in Essigsäure untersucht. Mit den zur Verfügung stehenden Verbindungen konnte eine Neuuntersuchung der thermolytischen Umlagerung von 4-Halogenphenylaziden zu 2-Aminophenolen und anderen Produkten unternommen werden. Diese Umlagerung findet sicherlich statt, allerdings differieren die dabei beobachteten Produkte signifikant von denen, die Suschitzky et al. 1963 und 1966 beschrieben.
    Notizen: Summary The halogenation of derivatives of 2-aminophenol with N-chloro- and N-bromosuccinimides at ambient temperatures in acetic acid was studied. With the necessary compounds available, a reexamination of the thermolytic rearrangement of 2-halophenyl azides to 2-aminophenols and other products was undertaken. It is certain that the rearrangement of 4-halophenyl azides to 2-aminophenols occurs but the products identified in this study differ significantly from those reported previously by Suschitzky et al. (1963, 1966).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00814133
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  • 16
    Digitale Medien
    Digitale Medien
    A study of photon production in hadronic events frome + e − annihilation (1990)
    Springer
    The European physical journal 46 (1990), S. 1-7 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Results are presented on an investigation of photons produced in multihadronic final states frome + e − annihilation at 35 GeV and 44 GeV center of mass energies. Scalling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π0 spectra with charged pion spectra it is found that the average π0 multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be 〈n η〈=0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, ofA=−0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02440827
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  • 17
    Digitale Medien
    Digitale Medien
    A comparison of measured jet cross sections with QCD calculations fore + e − annihilation (1991)
    Springer
    The European physical journal 49 (1991), S. 29-41 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The cross sections for 2-, 3- and 4-jet production have been determined with the JADE detector, sited on thee + e −-storage ring PETRA. Data at $$\sqrt s = 14$$ , 22, 35 and 44 GeV were compared to twoO(α s 2 ) QCD calculations. A first analysis was performed with uncorrected data using theO(α s 2 ) 3-jet matrix element calculation of Ellis, Ross and Terrano and the Lund String Monte Carlo program. In a second analysis the calculation of Kramer and Lampe was compared to corrected data. Both approaches gave a poor description of the data when the square of the momentum transferQ 2=s was used as the scale of the running coupling constant. The description improved when the renormalization scale was adjusted to the process studied. The data ware used to fix the best renormalization scale.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01570794
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  • 18
    Digitale Medien
    Digitale Medien
    5-Hydroxytryptamine4 receptors mediate relaxation of the rat oesophageal tunica muscularis mucosae (1991)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 343 (1991), S. 439-446 
    Details
    ISSN: 1432-1912
    Schlagwort(e): 5-HT4 ; Oesophagus ; Rat ; ICS 205–930 ; Benzamides
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The present study was designed to characterize an “atypical” 5-hydroxytryptamine (5-HT) receptor mediating relaxation of the rat oesophageal tunica muscularis mucosae. All experiments were performed under equilibrium conditions, using pargyline to inhibit the oxidative deamination of indoleamines, and cocaine and corticosterone to inhibit neuronal and extraneuronal uptake. Under these conditions 5-HT (0.3–1000 nmol/l) produced a concentration-dependent relaxation of carbachol-induced tension. The concentration-effect curve to 5-HT was unaffected by potent antagonists for 5-HT1, 5-HT2, 5-HT3 and so called 5-HT1P receptors (metergoline, methysergide, ketanserin, ondansetron, N-acetyl-5-hydroxytryptophyl-5-hydroxytryptophan amide), but was antagonized competitively by ICS 205–930 (pA2 = 6.7). Responses to 5-HT were mimicked by other indoleamines and substituted benzamides with the following order of potency: 5-HT ≥ 5-methoxytryptamine 〉 cisapride = α-methyl-5-HT = (S)-zacopride = renzapride 〉 (RS)-zacopride 〉 5-carboxamido-tryptamine = metoclopramide = (R)-zacopride 〉 tryptamine 〉 2-methyl-5-HT. ICS 205–930 afforded similar pA2 values (6.0–6.7) against each agonist, indicating a common site of action. Concentration-effect curves to 5-HT were not affected by tetrodotoxin or indomethacin, sugesting that 5-HT-induced relaxation of the tunica muscularis mucosae was mediated via a postjunctional receptor, independent of endogenous prostanoids. The pharmacological profile of the 5-HT receptor in the rat oesophageal tunica muscularis mucosae correlates well with the 5-HT4 receptor characterized recently in both the CNS and gastro-intestinal tract.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00169544
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  • 19
    Digitale Medien
    Digitale Medien
    Preparation and fungitoxicity of 3,6-dichloro-and 3,6-dibromo-8-quinolinols (1994)
    Springer
    Monatshefte für Chemie 125 (1994), S. 723-730 
    Details
    ISSN: 1434-4475
    Schlagwort(e): 3,6-dichloro-8-nitroquinoline ; 3,6-dibromo-8-nitroquinoline ; 8-amino-3,6-dichloroquinoline ; 8-amino-3,6-dibromoquinoline ; 3,6-dichloro-8-quinolinol ; 3,6-dibromo-8-quinolinol ; 1H NMR spectra
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung 3,6-Dichlor- und 3,6-Dibrom-8-chinoline wurden durch direkte Halogenierung von 8-Nitrochinolin mit N-Halogensuccinimid in Essigsäure oder durch Halogenierung der entsprechenden nachSkraup synthetisierten 6-Halogen-8-nitrochinoline hergestellt. Die Nitrogruppe wurde zum Amin reduziert und die Aminofunktion in 70% iger Schwefelsäure bei 220°C zum Phenol hydrolysiert. Die Fungitoxizität der 3,6-Dichlor- und 3,6-Dibrom-8-chinoline und jene der bei ihrer Herstellung auftretenden Zwischenstufen gegenAspergillus niger, Aspergillus oryzae, Myrothecium verrucaria, Trichoderma viride undMucor cirinelloides wurde bestimmt. 3,6-Dichlor-8-chinolin ist der derzeit stärkste bekannte fungitoxische Vertreter dieser Substanzklasse.
    Notizen: Summary 3,6-Dichloro- and 3,6-dibromo-8-quinolinols were prepared by direct halogenation of 8-nitroquinoline by N-halosuccinimide in acetic acid or by halogenation of the corresponding 6-halo-8-nitroquinoline prepared via aSkraup reaction. The nitro group was reduced to amino and the amine was hydrolyzed to the phenol in 70% sulfuric acid at 220°C. The fungitoxicity of 3,6-dichloro- and 3,6-dibromo-8-quinolinols, as well as intermediates in their preparation, againstAspergillus niger, Aspergillus oryzae, Myrothecium verrucaria, Trichoderma viride, andMucor cirinelloides was determined. 3,6-dichloro-8-quinolinol is the most fungitoxic analogue of this class of compounds observed to date.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01277632
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  • 20
    facet.materialart.
    Unbekannt
    P. Corneille, "Le Cid", ed. by Georges Forestier (Book Review) (1991)
    Cambridge : Periodicals Archive Online (PAO)
    The Modern language review. 86:1 (1991:Jan.) 208 
    Details
    ISSN: 0026-7937
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen
    Notizen: REVIEWS
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:0094-1991-086-01-000085
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