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  • 1
    Electronic Resource
    Electronic Resource
    Fixation of nitrite nitrogen during the humification of .alpha.-naphthol in soil suspensions (1989)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 37 (1989), S. 262-266 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00085a060
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  • 2
    Electronic Resource
    Electronic Resource
    Heterotrophic nitrification in samples of natural ecosystems (1973)
    s.l. : American Chemical Society
    Environmental science & technology 7 (1973), S. 39-42 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60073a007
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  • 3
    Electronic Resource
    Electronic Resource
    Microbial release of oil from soil columns (1979)
    s.l. : American Chemical Society
    Environmental science & technology 13 (1979), S. 346-348 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60151a010
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  • 4
    Electronic Resource
    Electronic Resource
    Mixed culture hydrogenotrophic nitrate reduction in drinking water (1992)
    Springer
    Microbial ecology 24 (1992), S. 271-290 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Isolation and identification of the bacteria from a hydrogenotrophic reactor for the denitrification of drinking water revealed that several microorganisms are involved. Acinetobacter sp., Aeromonas sp., Pseudomonas sp. and Shewanella putrefaciens were repeatedly isolated from the hydrogenotrophic sludge and postulated to be of primary importance in the process. Nitrate reduction to nitrite appears to be a property of a diverse group of organisms. Nitrite reduction was found to be stimulated by the presence of organic growth factors. Thus, in a mixed culture, hydrogenotrophic denitrification reactor, NO inf2 sup− formed by NO inf3 sup− -reducers can be converted by true denitrifiers thriving on organic growth factors either present in the raw water, or excreted by the microbial community. Mixotrophic growth also contributes to NO inf2 sup− reduction. Finally, chemolithotrophic bacteria participate in the nitrite to nitrogen gas conversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167786
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  • 5
    Electronic Resource
    Electronic Resource
    Competitive ability of amylolytic bacteria in activated sludge (1975)
    Springer
    Archives of microbiology 104 (1975), S. 279-283 
    Details
    ISSN: 1432-072X
    Keywords: Activated Sludge ; Microbial Ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Shifts were induced into the microbial community of activated sludge by the pulse addition of soluble starch. The subsequent changes of amylolytic and proteolytic microbial populations were recorded. Four amylolytic strains were isolated and characterized with regard to carrying capacity, specific surface and growth kinetics. The competitive ability of these strains was studied by means of two-member competition experiments. These experiments were analysed according to the Lotka-Volterra model and the de Wit method. The different results obtained suggest that the dominance of the amylolytic Pseudomonas sp. (code 01) is based on a combined occurrence of high amylolytic activity, large relative cell surface, high maximum specific growth rate and reduced sensitivity towards associated proteolytic populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00447337
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  • 6
    Electronic Resource
    Electronic Resource
    Retromobilization of heavy metal resistance genes in unpolluted and heavy metal polluted soil (1995)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 18 (1995), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: Retromobilization of the nonconjugative (Tra−Mob+) IncQ vector, pMOL155, and the non-mobilizable (Tra−Mob−) vector, pMOL149, by means of the IncP plasmids RP4 and pULB113 (RP4::Mu3A), was studied in plate matings and in soil microcosms, and compared with direct and triparental mobilization. Both vectors harbour the czc genes, originating from Alcaligenes eutrophus, which code for resistance to Co, Zn, and Cd. The donor of the czc genes was Escherichia coli which did not express these genes. The recipient, Alcaligenes eutrophus, expressed the czc genes very well. Retromobilization, direct and triparental mobilization of pMOL155 was observed in sterile soil. Both the addition of nutrients and heavy metals significantly enhanced the number of (retro)transconjugants. Retromobilization was also detected in nutrient amended nonsterile soil, but the presence of the autochthonous soil biota strongly reduced the number of retrotransconjugants and also prevented their increase upon application of heavy metals to the soil. Retromobilization of the czc genes, cloned in pMOL149, by using pULB113 was also observed, yet only in sterile, nutrient amended, heavy metal polluted soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1995.tb00176.x
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of long-term herbicide applications on the bacterial community structure and function in an agricultural soil (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 46 (2003), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Little is known about the chronic effect of herbicides on the soil microbial community, with most studies focusing on acute impacts. In this study, we investigated the effect of 20 years of atrazine and metolachlor application on the community structure, abundance and function of bacterial groups in the bulk soil of a maize monoculture. Group-specific PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis) of 16S rRNA genes was used to characterize the composition of the microbial community. Primers specific for the entire bacterial group, as well as for the Acidobacterium group, the actinomycetes, the ammonium oxidizers, and the Type I and II methanotrophs were used in the PCR-DGGE analysis. Cluster analysis of the DGGE patterns obtained with the different primer sets differentiated between the herbicide-treated and the non-treated control soil. In particular the methanotrophic community differed, with three bands (phylotypes) being absent (or showing a lower intensity) in the DGGE patterns of the herbicide-treated soils compared to the patterns of the control soil. The differences in the methanotrophic community structure were not reflected in the methane oxidation capacity, which was similar for the two treatments. The prevalence of methanotrophs as evaluated with real-time PCR analysis also did not differ between the herbicide-treated and non-treated soil. Our results indicate that the long-term use of the herbicides atrazine and metolachlor resulted in an altered soil community structure, in particular for the methanotrophic bacteria. These observed changes did not cause a decreased community function (methane oxidation), probably because the total abundance of the methanotrophs in the soil system was preserved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0168-6496(03)00205-8
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  • 8
    Electronic Resource
    Electronic Resource
    Elevated salinity selects for a less diverse ammonia-oxidizing population in aquarium biofilters (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 52 (2005), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The activity and changes in the structure of the community of the ammonia-oxidizing bacteria belonging to the Betaproteobacteria were monitored in freshwater and artificial seawater biofilters for two months after inoculation with a commercial nitrifying consortium. Both in freshwater and artificial seawater, ammonium oxidation proceeded immediately after addition of the inoculum, although initial activity in artificial seawater was lower than in freshwater. Denaturing gradient gel electrophoresis of the ammonia-oxidizing bacterial community of the inoculum and the freshwater and the artificial seawater aquaria as a function of time showed that initially only one dominant ammonia-oxidizer, closely related to Nitrosomonas marina, was detectable in all the systems. The fingerprint of the ammonia-oxidizing bacterial community in the artificial seawater biofilters continued to be dominated by this single band. In the freshwater aquaria, in contrast, the composition of the ammonia-oxidizer community became more diverse after one month, with 4–7 new bands appearing in the denaturing gradient gel fingerprint. Since the inoculum is cultivated at an average salinity of 11 g l−1, it is argued that the elevated salinity selects for a less diverse ammonia-oxidizer community in the inoculum and the artificial seawater aquaria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsec.2004.10.001
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  • 9
    Electronic Resource
    Electronic Resource
    Transfer of the catabolic plasmid RP4::Tn4371 to indigenous soil bacteria and its effect on respiration and biphenyl breakdown (1994)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 15 (1994), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The catabolic plasmid RP4::Tn4371, containing the genes for biphenyl and 4-chlorobiphenyl catabolism, was transferred from Enterobacter agglomerans DMK3 to indigenous bacteria in biphenyl amended sandy soil, although the donor survived for only 3 days. Proliferation of transconjugants above a detectable level required presence of the concomitant pollutant biphenyl. Different Gram-negative bacterial species, tentatively identified as Pseudomonas chlororaphis, Pseudomonas corrugata and Comamonas sp., had taken up the plasmid and were able to express the biphenyl degradation genes. These genera have, until now, not been reported to express the biphenyl degradative genes. The soil had a high natural catabolic capacity for biphenyl. Notwithstanding this, out of 8 trials in which DMK3 was inoculated, 2 were found not to respond but 6 had an increased biphenyl degradation and concomitant increased oxygen consumption. The results indicate that seeding of RP4::Tn4371 generates a variety of transconjugants and holds potential for increasing the soil biodegradation capacity towards chlorinated biphenyl analogues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1994.tb00231.x
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  • 10
    Electronic Resource
    Electronic Resource
    Prebiotic effects of chicory inulin in the simulator of the human intestinal microbial ecosystem (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 51 (2004), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The prebiotic potential of native chicory inulin was assessed in the Simulator of the Human Intestinal Microbial Ecosystem (SHIME) by monitoring microbial community from the colon compartments, its metabolic activity and community structure. Inulin addition selected for a higher short chain fatty acid production with shifts towards propionic and butyric acid. Conventional culture-based techniques and PCR-denaturing gradient gel electrophoresis analysis showed no remarkable changes in the overall microbial community from the colon compartments of the SHIME, whereas selective effects were seen for lactic acid bacteria. Quantitative PCR with bifidobacteria-specific primers revealed a significant increase with more than 1 log CFU ml−1 from the proximal to distal colon, in contrast to culture-based techniques, which only showed a minor bifidogenic effect in the ascending colon. Our results indicate that inulin purports prebiotic effects from the proximal to distal colon and that real-time PCR is a more precise technique to detect differences in bifidobacterial populations whereas conventional culturing techniques are much more variable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsec.2004.07.014
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