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  • 1995-1999  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Phenotypic characterization of natural populations of Fusarium oxysporum in relation to genotypic characterization (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 24 (1997), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Sixty strains of Fusarium oxysporum were characterized by (i) in vitro growth parameter estimates on four carbon sources and (ii) vegetative compatibility grouping. Growth was assessed by measuring optical density changes of fungal cultures in microtiter plates. Principal component analyses of growth parameter estimates permitted a good discrimination of the isolates on the four carbon sources and revealed a high level of diversity within populations of F. oxysporum. The 60 strains were assigned to 40 vegetative compatibility groups. Strains grouped in a given vegetative compatibility group had similar growth parameters. Trophic characterization and vegetative compatibility groups were compared to a genotypic characterization previously performed on this collection. Trophic characterization and vegetative compatibility grouping were more discriminating than the genotypic characterization. The three characterization methods suggested that vegetative compatibility groups could be considered the population unit among natural F. oxysporum populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1997.tb00424.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Use of GC and equilibrium calculations of CO2 saturation index to indicate whether freshwater bodies in north-eastern Germany are net sources or sinks for atmospheric CO2 (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 47-53 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The determination of CO2 saturation by two different methods is described for freshwater bodies of differing trophic states, hydrology and chemistry in the North-East of Germany. Direct measurements were carried out by gas chromatography and values were calculated from the dissolved inorganic carbon concentration and pH. These results were in good agreement. In both cases, the CO2 saturation index was calculated from the carbon dioxide/carbonate/hydrogencarbonate equilibrium in water. An overestimation of CO2 saturation index will be caused at pH 〉 7 by neglecting the calcium forming ion pairs with HCO3– and CO32–. The CO2 saturation patterns exhibited seasonal changes in all the lakes investigated which were variable within each trophic group. A direct relationship was found between the increasing trophic state and undersaturation of CO2 during the periods of high primary production. Thus, with respect to the atmosphere, these freshwater bodies act mostly as sources of CO2. Periods of ice covering and clear-water phases are characterized by high CO2 supersaturation and therefore the surface waters investigated are CO2 sources for short periods only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050832
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hepatotoxic cyanobacteria in the shallow lake Müggelsee (1999)
    Springer
    Hydrobiologia 408-409 (1999), S. 263-268 
    Details
    ISSN: 1573-5117
    Keywords: cyanobacteria ; Microcystissp. ; Aphanizomenon sp. ; microcystin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Since 1996 we have studied the occurrence of cyanobacterial hepatotoxins, microcystins (Mcyst), in the shallow lake Müggelsee. Intracellular (cell-bound) Mcyst's were detectable from late summer to autumn in 2 years, and maximum concentrations of about 3 μg/l of total cell-bound Mcyst were measured. The concentration of Mcyst's was correlated to the biovolume of Microcystissp. (R 2=0.560 in 1996 and R 2=0.483 in 1997; P 〈 0.001). Between years, the ratio of Mcyst'ss per biovolume of Microcystisdiffered significantly (P 〈 0,001; 0.913 μg/mm3in 1996 and 0.171 μg/mm3in 1997). The ratio of the detected Mcyst variants, Mcyst-LR and Mcyst-RR, was constant in all samples with Mcyst-LR:Mcyst-RR≈1:2.9. One out of 22 strains of Microcystissp. we isolated in 1997 contained Mcyst-LR and Mcyst-RR at a ratio of Mcyst-LR:Mcyst-RR=1:1.6. The Mcyst'ss found in lake samples were likely to have been produced by a number of a few strains that were present in the lake for extended periods of time in both years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017040126508
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Extrem saure Seen in Deutschland (1999)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 29 (1999), S. 98-109 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Seen mit Wasser, so sauer wie verdünnte Essigsäure, so sauer wie manche Kraterseen, gibt es solche Seen in Deutschland? Ja, sie gibt es, und zwar sogar recht zahlreich in den alten und vor allem in den neuen Bundesländern. Alle diese Seen sind künstlicher Natur und treten im Zusammenhang mit dem Abbau von Bodenschätzen auf. Durch diesen Vorgang werden tiefere Schichten des Deckgebirges belüftet und mit Wasser versorgt, so daß eine chemische und vor allem mikrobiologische Oxidation von reduzierten Schwefelkver bindungen (Sulfiden) einsetzen kann. Dieselben Vorgänge laufe auch auf und in den Abraumhalden ab. Sulfide sind sehr häufige Begleiter von Braun- oder Steinkohlevorkommen. Ein wesentlicher Teil der Wasserkontaminationen im mitteldeutschen und Lausitzer Raum ist in der Tat mit der Braunkohleförderung verbunden. Ferner sind die meisten, abbauwürdigen Metallvorkommen ebenfalls in sulfidischen Erzen zu finden, so daß deren Abbau zu denselben Oxidation führt, die international als Als Mine Drainage bezeichnet werden.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.960290206
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  • 5
    Electronic Resource
    Electronic Resource
    Blaue Liste Institute (1999)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 29 (1999), S. 308-309 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Der Nachhaltigkeitsgedanke bei der Nutzung der Natur ist, zumindest als Begriff, jedermann bewußt. Daß es selbstverständlich auch nicht-nachhaltige Umweltnutzungen gibt, wird uns klar, wenn wir an die überdüngten, blaualgen verseuchten Gewässer insbesondere in den neuen Bundesländern denken, uns die Hochwässer in den süddeutschen Flüssen dieses Frühjahrs vor Augen führen, durch die Braunkohletagebau-Regionen Mitteleuropas fahren oder uns die Wasser- oder Winderosionsprobleme in deutschen Landschaften vergegenwärtigen. Dies sind nur einige, willkürlich zusammengestellte Beispiele. Das Institut für Gewässerökologie (IGB) versucht, den Gedanken der nachhaltigen Bewirtschaftung von Binnengewässern zu präzisieren und in aktuelle Forschungsarbeiten umzusetzen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.960290509
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    Paper (German National Licenses)
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