Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Depth distribution of microbial production and oxidation of methane in northern boreal peatlands (1994)
    Springer
    Microbial ecology 27 (1994), S. 253-265 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The depth distributions of anaerobic microbial methane production and potential aerobic microbial methane oxidation were assessed at several sites in both Sphagnum- and sedge-dominated boreal peatlands in Sweden, and compared with net methane emissions from the same sites. Production and oxidation of methane were measured in peat slurries, and emissions were measured with the closed-chamber technique. Over all eleven sites sampled, production was, on average, highest 12 cm below the depth of the average water table. On the other hand, highest potential oxidation of methane coincided with the depth of the average water table. The integrated production rate in the 0–60 cm interval ranged between 0.05 and 1.7 g CH4 m −2 day− and was negatively correlated with the depth of the average water table (linear regression: r 2 = 0.50, P = 0.015). The depth-integrated potential CH4-oxidation rate ranged between 3.0 and 22.1 g CH4 m−2 day−1 and was unrelated to the depth of the average water table. A larger fraction of the methane was oxidized at sites with low average water tables; hence, our results show that low net emission rates in these environments are caused not only by lower methane production rates, but also by conditions more favorable for the development of CH4-oxidizing bacteria in these environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182409
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Life without oxygen: what can and what cannot? (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 1197-1205 
    Details
    ISSN: 1420-9071
    Keywords: Anaerobic metabolism ; anaerobic environment ; biotechnological application of anaerobes ; redox sequences ; evolution of oxygen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The basic principles involved in the biotransformation of organic carbon compounds in the absence of molecular oxygen (dioxygen) are presented in this paper. The role of various electron acceptors during the breakdown of organic compounds is discussed and the metabolic end-products expected are summarized. The different biochemical possibilities and strategies for the anaerobic degradation of organic matter and the metabolic response of some organisms to anaerobiosis are elucidated. Positive and negative effects of anaerobiosis on environmentally relevant processes and their influence on man and on animals are reviewed. Finally, some examples of the biotechnological application of anaerobic processes are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946391
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Thermophilic anaerobic amino acid degradation: deamination rates and end-product formation (1995)
    Springer
    Applied microbiology and biotechnology 43 (1995), S. 235-241 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Anaerobic thermophilic degradation of several amino acids was studied in batch cultures using an inoculum from a steady-state semicontinuous enrichment culture. Experiments were done in the presence and absence of methanogenesis and known electron acceptors in the Stickland reaction. Methanogenesis was found to be crucial for the degradation of amino acids known to be oxidatively deaminated (leucine, valine and alanine). Other amino acids (serine, threonine, cysteine and methionine) were degraded under both methanogenic and non-methanogenic conditions. Degradation rates for these four amino acids were 1.3 to 2.2 times higher in cases where methanogenesis was active. The degradation rates of serine, threonine, cysteine and methionine were about twice as high as the rates of leucine, valine and alanine under methanogenic conditions. Inclusion of different electron acceptors, known to work in the Stickland reaction, did not enhance the degradation rates of any amino acid used nor did they alter the degradation patterns. Glycine was oxidatively deaminated to acetate, carbon dioxide, hydrogen and ammonium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00172818
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Thermophilic anaerobic amino acid degradation: deamination rates and end-product formation (1995)
    Springer
    Applied microbiology and biotechnology 43 (1995), S. 235-241 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Anaerobic thermophilic degradation of several amino acids was studied in batch cultures using an inoculum from a steady-state semicontinuous enrichment culture. Experiments were done in the presence and absence of methanogenesis and known electron acceptors in the Stickland reaction. Methanogenesis was found to be crucial for the degradation of amino acids known to be oxidatively deaminated (leucine, valine and alanine). Other amino acids (serine, threonine, cysteine and methionine) were degraded under both methanogenic and non-methanogenic conditions. Degradation rates for these four amino acids were 1.3 to 2.2 times higher in cases where methanogenesis was active. The degradation rates of serine, threonine, cysteine and methionine were about twice as high as the rates of leucine, valine and alanine under methanogenic conditions. Inclusion of different electron acceptors, known to work in the Stickland reaction, did not enhance the degradation rates of any amino acid used nor did they alter the degradation patterns. Glycine was oxidatively deaminated to acetate, carbon dioxide, hydrogen and ammonium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050396
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Potential for higher rates of denitrification in earthworm casts than in the surrounding soil (1986)
    Springer
    Biology and fertility of soils 2 (1986), S. 147-149 
    Details
    ISSN: 1432-0789
    Keywords: Denitrification ; N2O ; Earthworm casts ; Respiration ; Lumbricus terrestris ; Medicago sativa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Earthworms (Lumbricus terrestris L.) were cultured in the laboratory and fed on lucerne (Medicago sativa L.). Denitrification rates in the surface casts and the surrounding soil were quantified using C2H2-inhibition of nitrous oxide reductase. The investigation also included determination of the N2O-formation by nitrification as well as CO2-formation as a measure of respiration. The denitrification rates of wet earthworm casts were found to be significantly higher than those occurring in wet samples from the soil. The low N2O-formation observed seemed to be due to denitrification. Respiration was higher in casts, indicating higher oxygen demand which resulted in more anaerobic conditions. The energy supply was probably better in casts compared with the surrounding soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257593
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Relationships between soil moisture content and nitrous oxide production during nitrification and denitrification (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 106-111 
    Details
    ISSN: 1432-0789
    Keywords: Nitrification ; Denitrification ; Soil water content ; N2O production ; Acetylene ; Ammonium fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of soil water content [60%–100% water-holding capacity (WHC)] on N2O production during autotrophic nitrification and denitrification in a loam soil was studied in a laboratory experiment by selectively inhibiting nitrification with a low C2H2 concentration (2.1 Pa). Nitrifiers usually produced more N2O than denitrifiers. During an initial experimental period of 0–6 days the nitrifiers produced more N2O than the denitrifiers by a factor ranging from 1.4 to 16.5, depending on the water content and length of incubation. The highest N2O production rate by nitrifiers was observed at 90% WHC, when the soil had become partly anaerobic, as indicated by the high denitrification rate. At 100% WHC there were large gaseous losses from denitrification, while nitrification losses were smaller except for the first period of measurement, when there was still some O2 remaining in the soil. The use of 10 kPa C2H2 to inhibit reduction of N2O to N2 stimulated the denitrification process during prolonged incubation over several days; thus the method is unsuitable for long-term studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257658
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A method of selective inhibition to distinguish between nitrification and denitrification as sources of nitrous oxide in soil (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 112-119 
    Details
    ISSN: 1432-0789
    Keywords: Denitrification ; Nitrification ; Selective inhibitors ; Nitrapyrin ; Acetylene ; Nitrous oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrapyrin and C2H2 were evaluated as nitrification inhibitors in soil to determine the relative contributions of denitrification and nitrification to total N2O production. In laboratory experiments nitrapyrin, or its solvent xylene, stimulated denitrification directly or indirectly and was therefore considered unsuitable. Low partial pressures of C2H2 (2.5–5.0 Pa) inhibited nitrification and had only a small effect on denitrification, which made it possible to estimate the contribution of denitrification. The contribution of nitrification was estimated by subtracting the denitrification value from total N2O production (samples without C2H2). The critical C2H2 concentrations needed to achieve inhibition of nitrification, without affecting the N2O reductase in denitrifiers, must be individually determined for each set of experimental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257659
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Anaerobic degradation of phthalic acid esters during digestion of municipal solid waste under landfilling conditions (1996)
    Springer
    Biodegradation 7 (1996), S. 345-352 
    Details
    ISSN: 1572-9729
    Keywords: biodegradation ; methane formation ; phthalic acid esters ; landfills ; bioremediation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Anaerobic microorganisms in municipal solid waste samples from laboratory-scale landfill reactors and a pilot-plant biogas digestor were investigated with the aim of assessing their ability to transform four commercially used phthalic acid esters (PAEs) and phthalic acid (PA). The PAEs studied were diethyl phthalate (DEP), butylbenzyl phthalate (BBP), dibutyl phthalate (DBP) and bis(2-ethylhexyl) phthalate (DEHP). No biological transformation of DEHP could be detected in any of the experiments. Together with waste samples from the simulated landfilling conditions, the PAEs (except DEHP) were hydrolytically transformed to their corresponding monoesters. These accumulated as end products, and in most cases they were not further degraded. During incubation with waste from the biogas digestor, the PAEs (except DEHP) were completely degraded to methane and carbon dioxide. The influence of the landfill development phase on the transformations was investigated utilizing PA and DEP as model substances. We found that during both the intense and stable methanogenic (but not the acidogenic) phases, the microoganisms in the samples had the potential to transform PA. A shorter lag phase was observed for the PA transformation in the samples from the stable methanogenic phase as compared with earlier phases. This indicates an increased capacity to degrade PA during the aging phases of the municipal solid waste in landfills. No enhancement of the DEP transformation could be observed as conditions in the methanogenic landfill model changed over a year's time. The results indicate that microorganisms developing in a methanogenic landfill environment have a substantially lower potential to degrade PAEs compared with those developing in a biogas reactor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115748
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Anaerobic degradation of xenobiotics by organisms from municipal solid waste under landfilling conditions (1996)
    Springer
    Antonie van Leeuwenhoek 69 (1996), S. 67-74 
    Details
    ISSN: 1572-9699
    Keywords: biodegradation ; chlorinated compounds ; freons ; methane formation ; phthalic acid esters ; phenol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The potential for biological transformation of 23 xenobiotic compounds by microorganisms in municipal solid waste (MSW) samples from a laboratory scale landfill reactor was studied. In addition the influence of these xenobiotic compounds on methanogenesis was investigated. All R11, 1,1 dichloroethylene, 2,4,6 trichlorophenol, dimethyl phthalate, phenol, benzoate and phthalic acid added were completely transformed during the period of incubation (〉 100 days). Parts of the initially added perchloroethylene, trichloroethylene, R12, R114, diethyl phthalate, dibutyl phthalate and benzylbutyl phthalate were transformed. Methanogenesis from acetate was completely inhibited in the presence of 2,5 dichlorophenol, whereas 2,4,6 trichlorophenol and R11 showed an initial inhibition, whenafter methane formation recovered. No transformation or effect on the anaerobic microflora occurred for R13, R22, R114, 3 chlorobenzoate, 2,4,6 trichlorobenzoate, bis(2 ethyl)hexyl phthalate, diisodecyl phthalate and dinonyl phthalate. The results indicate a limited potential for degradation, of the compounds tested, by microorganisms developing in a methanogenic landfill environment as compared with other anaerobic habitats such as sewage digestor sludge and sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00641613
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Degradation of bis(2-ethylhexyl) phthalate constituents under methanogenic conditions (1996)
    Springer
    Biodegradation 7 (1996), S. 501-506 
    Details
    ISSN: 1572-9729
    Keywords: biodegradation ; Bis(2-ethylhexyl) phthalate ; 2-ethylhexanol ; 2-ethylhexanoic acid ; methane formation ; mono(2-ethylhexyl) phthalate ; phthalic acid esters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The degradation of bis(2-ethylhexyl) phthalate (DEHP) and its intermediary hydrolysis products 2-ethylhexanol (2-EH) and mono(2-ethylhexyl) phthalate (MEHP) was investigated in a methanogenic phthalic acid ester-degrading enrichment culture at 37°C. 2-Ethylhexanoic acid (2-EHA), a plausible degradation product of 2-EH, was also studied. The culture readily degraded 2-EH via 2-EHA to methane which was formed in stoichiometric amounts assuming complete degradation of 2-EH to methane and carbon dioxide. MEHP was degraded to stoichiometric amounts of methane with phthalic acid as a transient intermediate. DEHP remained unaffected throughout the experimental period (330 days).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115296
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...