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  • 1
    Electronic Resource
    Electronic Resource
    Temporal and spatial variation in the nitrite-oxidizing bacterial community of a grassland soil (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 10 (1992), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The temporal and spatial distribution of the nitrite-oxidizing community of a non-fertilized, semi-natural grassland soil was studied to obtain more insight into the possible variation in nitrate production in this soil throughout the year. Data describing the size, potential nitrite-oxidizing activity and serotype composition of the nitrite-oxidizing community are reported. In addition, several abiotic soil parameters potentially related to the activity of this community were measured. Whereas numbers and potential activities largely varied with time and place, the specific affinity for nitrite oxidation, defined as the ratio VmaxKm, was relatively constant. The serotypes Nitrobacter agilis, N. winogradskyi and N. hamburgensis were all present in the top 5-cm soil in every 500-g sample examined, showing that these species co-exist in this soil.By principal component analyses performed with the parameters describing aspects of the community, i.e. most probable numbers, serotype numbers and potential nitrite-oxidizing activities, it was demonstrated that these parameters were all affected in a different way by yet unknown factors. This was confirmed by stepwise regression analyses. If significant, the different biotic parameters correlated with different abiotic factors. Hence, none of the biotic parameters emerged from this study as an indicator that should be used preferentially for the description of the nitrite-oxidizing community in a grassland soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1992.tb00004.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Numbers of nitrite-oxidizing bacteria in the root zone of grassland plants (1993)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 12 (1993), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The results of Most Probable Number determinations applying low and high concentrations of nitrite reveal the presence of at least two different communities of potential nitrite-oxidizing bacteria in a number of soil types. The effect of plant roots on these two communities was studied in pot experiments with soil from natural grassland in the presence or absence of either Festuca rubra or Plantago lanceolata. Both plant species are dominant on the grassland soil used in this study. Plant roots had a stimulating effect on the numbers of nitrite-oxidizing bacteria determined with 0.05 mM nitrite in the enumeration medium as well as on the potential nitrite-oxidizing activity. On the other hand, plants roots, especially in younger plants, repressed the numbers of nitrite-oxidizing bacteria enumerated with 5.0 mM nitrite in the counting medium. Pure culture studies with organotrophically grown Nitrobacter species clearly showed that this type of potential nitrite-oxidizing bacteria could not have been responsible for the relatively high Most Probable Numbers observed in the root zones when applying 0.05 mM nitrite in the enumeration medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1993.tb00033.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Enumeration of nitrite-oxidizing bacteria in grassland soils using a Most Probable Number technique: Effect of nitrite concentration and sampling procedure (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 74 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Numbers of nitrite-oxidizing bacteria were determined in grassland soils using a Most Probable Number technique. Two concentrations of nitrite were used in the incubation medium, i.e. 0.05 and 5.0 mM. The results of the enumerations were highly dependent on the nitrite concentration as well as on the grassland soil sampled. In the one soil the highest numbers were counted with 5.0 mM, whereas in other soils highest numbers were obtained in media with 0.05 mM nitrite. The spatial distribution of nitrite-oxidizing bacteria was determined i two field plots. Variation between individual samples was low in one plot and high in the other. The implications of the observed differences for the sampling procedure in each sampling plot are discussed. In the waterlogged, oxygen-limited soils, numbers of nitrite-oxidizing bacteria were as high as in the drained soils. The chemolitho-autotrophic nature of these nitrifiers has been confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb04074.x
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  • 4
    Electronic Resource
    Electronic Resource
    Most Probable Numbers of chemolitho-autotrophic nitrite-oxidizing bacteria in well drained grassland soils: Stimulation by high nitrite concentrations (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 74 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The results of Most Probable Number (MPN) enumerations of chemolitho-autotrophic nitrite oxidizers are very much dependent on the nitrite concentration applied in the incubation medium. In order to explain this dependency, the influence of pH, nitrite and resultant nitrous acid concentration of the incubation medium on the MPN-enumeration was investigated. It appeared that none of these factors were exclusively responsible for the result of the enumeration. In samples from a well drained grassland soil, highest number have been obtained with a combination of a low pH and a low nitrite concentration in the counting medium. The relation between the MPN-counting results and the nitrous acid concentration showed an optimum with the same soil samples. It was hypothesized that the relatively high numbers of nitrite-oxidizing cells determined in soil samples at a high nitrite concentration and pH 7.3 was due to the presence of dormant cells. However, this hypothesis could not be confirmed with enumerations of aged cell suspensions of different Nitrobacter species. In contrast to the field observations, these resting cells were always enumerated more efficiently at a low nitrite concentration. The importance of the use of more than one incubation medium for the enumeration of nitrite-oxidizing bacteria is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb04075.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of the incubation period on the result of MPN enumerations of nitrite-oxidizing bacteria: theoretical considerations (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 85 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract A computer model based on Monod- and Haldane-kinetics was used to estimate the minimum incubation period required for MPN enumerations of nitrite-oxidizing bacteria. The minimum incubation period was defined as the time needed for one cell, present in the tubes inoculated with the highest dilutions, to grow into a population that oxidized all the nitrite present at the start of the incubation. Kinetic parameters used in the model were derived from literature data and applied in different combinations. The results show that the minimum incubation period may increase with decreasing initial nitrite concentrations in the incubation medium. They also show that the opposite trend, i.e. increasing minimum incubation periods with increasing nitrite concentration periods with increasing nitrite concentration, can be explained by introducing a term for substrate inhibition in the model. A MPN enumeration result obtained with samples from a waterlogged peat bog soil could only partly be explained by the model if only one set of parameters was used. This indicates that the community of nitrite-oxidizing bacteria in this soil is composed of at least two types of nitrite-oxidizing bacteria, with different kinetic parameters of nitrite oxidation and growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04760.x
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  • 6
    Electronic Resource
    Electronic Resource
    Temporal and spatial variation in the nitrite-oxidizing bacterial community of a grassland soil (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 101 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The temporal and spatial distribution of the nitrite-oxidizing community of a non-fertilized, semi-natural grassland soil was studied to obtain more insight into the possible variation in nitrate production in this soil throughout the year. Data describing the size, potential nitrite-oxidizing activity and serotype composition of the nitrite-oxidizing community are reported. In addition, several abiotic soil parameters potentially related to the activity of this community were measured. Whereas numbers and potential activities largely varied with time and place, the specific affinity for nitrite oxidation, defined as the ratio Vmax/Km, was relatively constant. The serotypes Nitrobacter agilis, N. winogradskyi and N. hamburgensis were all present in the top 5-cm soil in every 500-g sample examined, showing that these species co-exist in this soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05766.x
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