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  • Articles  (38,766)
  • Articles: DFG German National Licenses  (38,766)
  • Chemistry  (38,741)
  • biofilm  (80)
  • Analytical Chemistry and Spectroscopy
  • Animals
  • Process Engineering, Biotechnology, Nutrition Technology  (38,756)
  • Energy, Environment Protection, Nuclear Power Engineering  (10)
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  • Articles  (38,766)
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  • Articles: DFG German National Licenses  (38,766)
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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Bioresource Technology 47 (1994), S. 275-282 
    ISSN: 0960-8524
    Keywords: Anaerobic filter ; acetate ; biofilm ; biomass ; egg albumin ; glucose ; growth yield ; methane production ; two-phase process
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Bioresource Technology 48 (1994), S. 155-161 
    ISSN: 0960-8524
    Keywords: Effective diffusivity ; anaerobic digestion ; biofilm ; bioflocs ; fatty acids ; methane ; reaction-diffusion
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biodegradation 8 (1997), S. 177-187 
    ISSN: 1572-9729
    Keywords: biofilm ; copper ; potable water ; remedial measures
    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 physical and chemical properties of biofilms, incombination with metabolic and degradation products ofbiological origin, influence the nature and localchemistry of the aqueous phase at the copper/biofilmphase boundary. The pitting susceptibility of copperis determined by this change of water composition atthe copper/biofilm phase boundary and is supported bythe mixture of solid corrosion products and thebiofilm at the copper surface. Several factors influence the susceptibility of copperto MIC: commissioning, design and operatingconditions; the chemical composition of the water andthe relevant biological activity. Field experience andtheory showed that a combination of methods should beused to protect existing copper installations. Insummary, water chemistry seems to be a majorinfluencing parameter for the described corrosionproblems. Raising the alkalinity of the potable waterwhilst optimising the chloride/sulphate ratio isconsidered as the most promising preventative measureto overcome the described problems.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1572-9729
    Keywords: biofilm ; MEK ; VOC ; consortium ; Alcaligenes denitrificans ; Geotrichum candidum ; Fusarium oxysporum ; gas/liquid mass transfer ; pH ; sloughing ; waste-gas treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A novel type of bioreactor was designed to clean VOCs-containing air.The operation of this reactor consists in mixing the polluted gas and a mistof nutrient solution in the presence of microorganisms in order to maximizecontact and transfer between gas, liquid and microorganisms and to promotethe degradation kinetics and the relative removal efficiency of thepollutant. A bacterial consortium acclimatized to MEK and containing apreponderance of Alcaligenes denitrificans was established under non-axenicconditions. On the tubular reactor's glass walls, a continuous biofilm wasdeveloped. This biofilm was rapidly contaminated by two fungi able todegrade MEK: Geotrichum candidum and Fusarium oxysporum. Their abundance inthe reactor is probably linked to the acidic conditions inside the biofilmand to their broader tolerance for low pH values concomitant with MEKdegradation. In the reactor, a maximum volumetric degradation rate of 3.5 kgMEK/m3 reactor·d was obtained for arelative removal efficiency of 35%, whereas the latter was maintainedat 70% for more modest applied loadings of 1.5 kgMEK/m3 reactor ·d. In liquid batchcultures, a biomass originating from the biofilm was able to degrade 0.40gMEK/gDCW·h at the optimal pH of 7. Aregular cycle of detachment-recolonization was observed during the operationof the bioreactor. The maximal degradation activity was obtained with a thinbiofilm and was not increased as the biofilm grew in thickness. The overalldegradation rate of the process did not appear to be limited by thediffusion of oxygen inside the biofilm. Over short periods of time, the MEKtransfer from the gaseous phase to the biofilm was neither affected by thepresence of the mist nor by the wetting of the biofilm. A better control ofthe biofilm pH led to improved performance in terms of removal rate but notin terms of relative elimination efficiency.
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  • 5
    ISSN: 1572-9729
    Keywords: activated sludge ; biofilm ; microbial activity ; microsensors ; sulfate reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Microsensors used in microbial ecology are reviewed with emphasis on new sensor developments (NO3 -, NO2 -, NH4 +, CO2, H2, H2S and CH4 microsensors as well as fiberoptical microsensors for O2, temperature and pH). Examples of microsensor applications in biofilms and activated sludge flocs are presented, where sulfate reduction and denitrification were studied.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 8 (1984), S. 309-324 
    ISSN: 1432-1009
    Keywords: Animals ; Indicators ; Air pollution ; Ecosystem responses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract With existing and proposed air-quality regulations, ecological disasters resulting from air emissions such as those observed at Copperhill, Tennessee, and Sudbury, Ontario, are unlikely. Current air-quality standards, however, may not protect ecosystems from subacute and chronic exposure to air emissions. The encouragement of the use of coal for energy production and the development of the fossil-fuel industries, including oil shales, tar sands, and coal liquification, point to an increase and spread of fossil-fuel emissions and the potential to influence a number of natural ecosystems. This paper reviews the reported responses of ecosystems to air-borne pollutants and discusses the use of animals as indicators of ecosystem responses to these pollutants. Animal species and populations can act as important indicators of biotic and abiotic responses of aquatic and terrestrial ecosystems. These responses can indicate long-term trends in ecosystem health and productivity, chemical cycling, genetics, and regulation. For short-term trends, fish and wildlife also serve as monitors of changes in community structure, signaling food-web contamination, as well as providing a measure of ecosystem vitality. Information is presented to show not only the importance of animals as indicators of ecosystem responses to air-quality degradation, but also their value as air-pollution indices, that is, as air-quality-related values (AQRV), required in current air-pollution regulation.
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  • 7
    ISSN: 1476-5535
    Keywords: S. epidermidis ; biofilm ; slime ; lectin marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A lectin-biotin assay was developed for use in the specific detection of slime produced byStaphylococcus epidermidis RP62A and M187sp11 grown in a chemically defined medium. Mature biofilm was formed on polyvinylchloride (PVC) disks using a combined chemostat-modified Robbins device (MRD) model system. Specimens fixedin situ were: 1) stained with ruthenium red; 2) reacted overnight with biotin-labeled lectins (WGA, succinyl-WGA, Con A, or APA) followed by treatment with gold-labeled extravidin; or 3) reacted with antibodies againstS. epidermidis RP62A capsular polysaccharide/adhesin (PS/A) using an immunogold procedure. WGA and succinyl-WGA (S-WGA), which specifically bindN-acetylglucosamine, were shown by TEM to react only with slime, both cell-associated and exocellular. In contrast, Con A, APA and anti-PS/A reacted with the bacterial cell surface but did not react with slime. These results indicate the usefulness of WGA lectin as a specific marker for detection of the presence and distribution of slime matrix material inS. epidermidis biofilm.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of industrial microbiology and biotechnology 16 (1996), S. 249-256 
    ISSN: 1476-5535
    Keywords: ethanol ; biofilm ; plastic composite-supports ; Zymomonas ; Saccharomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Continuous ethanol fermentations were performed in duplicate for 60 days withZymomonas mobilis ATCC 331821 orSaccharomyces cerevisiae ATCC 24859 in packed-bed reactors with polypropylene or plastic composite-supports. The plastic composite-supports used contained polypropylene (75%) with ground soybean-hulls (20%) and zein (5%) forZ. mobilis, or with ground soybean-hulls (20%) and soybean flour (5%) forS. cerevisiae. Maximum ethanol productivities of 536 gL−1 h−1 (39% yield) and 499 gL−1 h−1 (37% yield) were obtained withZ. mobilis on polypropylene and plastic composite-supports of soybean hull-zein, respectively. ForZ. mobilis, and optimal yield of 50% was observed at a 1.92h−1 dilution rate for soybean hull-zein plastic composite-supports with a productivity of 96gL−1h−1, whereas with polypropylene-supports the yield was 32% and the productivity was 60gL−1h−1. With aS. cerevisiae fermentation, the ethanol production was less, with a maximum productivity of 76gL−1h−1 on the plastic composite-support at a 2.88h−1 dilution rate with a 45% yield. Polypropylene-support bioreactors were discontinued due to reactor plugging by the cell mass accumulation. Support shape (3-mm chips) was responsible for bioreactor plugging due to extensive biofilm development on the plastic composite-supports. With suspensionculture continuous fermentations in continuously-stirred benchtop fermentors, maximum productivities of 5gL−1h−1 were obtained with a yield of 24 and 26% withS. cerevisiae andZ. mobilis, respectively. Cell washout in suspensionculture continuous fermentations was observed at a 1.0h−1 dilution rate. Therefore, for continuous ethanol fermentations, biofilm reactors out-performed suspension-culture reactors, with 15 to 100-fold higher productivities (gL−1h−1) and with higher percentage yields forS. cerevisiae andZ. mobilis, respectively. Further research is needed with these novel supports to evaluate different support shapes and medium compositions that will permit medium flow, stimulate biofilm formation, reduce fermentation costs, and produce maximum yields and productivities.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of industrial microbiology and biotechnology 17 (1996), S. 228-234 
    ISSN: 1476-5535
    Keywords: colonization ; biofilm ; diversity ; proximal vertical packing ; cell-cell interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Using laminar flow chambers and time-lapse video imaging, colonization of surfaces by four marine bacteria revealed a diverse range of morphological characteristics and cell-cell interactions. The strain SW5 formed a compact, multilayered single- and double-cell biofilm on hydrophobic surfaces but developed long multicellular chains on hydrophilic surfaces. The morphologically similar SW8 showed unusual proximal vertical packing of cells on both substrata.Vibrio sp strain S14 exhibited cyclical colonization-detachment events on both substrata.Pseudomonas sp strain S9 initially displayed reversible and then irreversible adhesion apparently triggered by a cell density phenomenon that led to the development of regular microcolonies on both substrata with individual cells translocating between the colonies. The length of time bacteria were exposed to and their density at a surface influenced behavioral traits, with diverse and distinctive species-specific behavioral events.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of industrial microbiology and biotechnology 15 (1995), S. 257-262 
    ISSN: 1476-5535
    Keywords: bacteria ; interaction ; biofilm ; mixed-species ; community
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Interactions among bacterial populations can have a profound influence on the structure and physiology of microbial communities. Interspecies microbial interactions begin to influence a biofilm during the initial stages of formation, bacterial attachment and surface colonization, and continue to influence the structure and physiology of the biofilm as it develops. Although the majority of research on bacterial interactions has utilized planktonic communities, the characteristics of biofilm growth (cell positions that are relatively stable and local areas of hindered diffusion) suggest that interspecies interactions may be more significant in biofilms.
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