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  • 1
    Language: English
    In: Genome announcements, 01 September 2016, Vol.4(5)
    Description: Iron- and manganese-depositing bacteria occur in many soils and all water systems, and their biogenic depositions of ochre in technical systems may cause severe clogging problems and monetary losses. "Candidatus Viadribacter manganicus" is a small coccoid, iron- and manganese-depositing bacterium isolated from the Lower Oder Valley National Park, Germany.
    Keywords: Biology;
    ISSN: 2169-8287
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  • 2
    Language: English
    In: Water Research, April 1, 2015, Vol.72, p.218(9)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.watres.2015.01.009 Byline: Yongjun Zhang, Hong Zhu, Ulrich Szewzyk, Sven Uwe Geissen Abstract: A tertiary treatment step is required in current wastewater treatment plants to remove trace pollutants and thus to prevent their extensive occurrence in the aquatic environment. In this study, natural MnOx ore and natural zeolite were separately used to pack two lab-scale aerated biofilters, which were operated in approximately 1.5 years for the removal of frequently occurring pharmaceuticals, including carbamazepine (CBZ), diclofenac (DFC), and sulfamethoxazole (SMX), out of synthetic and real secondary effluents. Mn.sup.2+ was added in the feeds to promote the growth of iron/manganese oxidizing bacteria which were recently found to be capable of degrading recalcitrant pollutants. An effective removal (80-90%) of DFC and SMX was observed in both biofilters after adaptation while a significant removal of CBZ was not found. Both biofilters also achieved an effective removal of spiked Mn.sup.2+, but a limited removal of carbon and nitrogen contents. Additionally, MnOx biofilter removed 50% of UV.sub.254 from real secondary effluent, indicating a high potential on the removal of aromatic compounds. Author Affiliation: (a) Technische Universitat Berlin, Chair of Environmental Process Engineering, Sekr. KF2, Strasse des 17.Juni 135, 10623 Berlin, Germany (b) Technische Universitat Berlin, Chair of Environmental Microbiology, Sekr. BH 6-1, Ernst-Reuter-Platz 1, 10587 Berlin, Germany Article History: Received 31 May 2014; Revised 16 December 2014; Accepted 7 January 2015
    Keywords: Zeolites ; Carbamazepine
    ISSN: 0043-1354
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 01 March 1994, Vol.91(5), pp.1810-1813
    Description: A borehole drilled to a total depth of 6779 m in granitic rock in Gravberg, Sweden, was sampled and examined for the presence of anaerobic, thermophilic, fermenting bacteria and sulfate-reducing bacteria. Growth in enrichment cultures was obtained only from water samples collected from a specific sampling depth in the borehole (3500 m). The hole was cased down to a depth of 5278 m and open to the formation below that level. All the water below 2000 m in depth standing in the borehole at the time of sampling must have entered at the 5278-m level or below, during a prior pumping operation. A strong salinity stratification certifies that no major amount of vertical mixing had taken place. The depth from which bacteria could be enriched was that of a pronounced local minimum of salinity. Pure cultures of thermophilic, anaerobic, fermenting bacteria were obtained with the following substrates: glucose, starch, xylan, ethanol, and lactate. The morphology and physiology of the glucose- and starch-degrading strains indicate a relationship to Thermoanaerobacter and Thermoanaerobium species. All but one of the newly isolated strains differ however from those by lacking acetate as a fermentation product. The glucose-degrading strain Gluc1 is phylogenetically related to Clostridium thermohydrosulfuricum, with an evolutionary distance based upon rRNA sequence comparisons of 3%. No sulfate-reducing or methanogenic bacteria were found.
    Keywords: Biological sciences -- Biology -- Microbiology ; Education -- Formal education -- Pedagogy ; Physical sciences -- Earth sciences -- Hydrology ; Physical sciences -- Earth sciences -- Hydrology ; Physical sciences -- Earth sciences -- Geology ; Physical sciences -- Chemistry -- Chemical compounds ; Physical sciences -- Chemistry -- Chemical compounds ; Biological sciences -- Biology -- Microbiology ; Physical sciences -- Earth sciences -- Geology ; Biological sciences -- Biology -- Microbiology
    ISSN: 00278424
    E-ISSN: 10916490
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  • 4
    Language: English
    In: Water Research, 15 December 2016, Vol.107, pp.113-126
    Description: The abundance, diversity and composition of bacterial communities in water wells with low groundwater temperatures were assessed. The drinking water catchment system, equipped with subsurface groundwater treatment for iron- and manganese removal, is located within a continental influenced veldt landscape type in eastern Russia, close to the border to China. In this study, the bacterial communities in 22 different water wells of the catchment system were analyzed and correlated to operating conditions and environmental factors. The investigated bacterial treated and groundwater populations differed from those in central European groundwater. Large variations between the investigated samples were observed, and DGGE profiles of water samples from the beginning and the end of the abstraction phases revealed two distinct fingerprint clusters with about 82% similarity to each other corresponding to the operation mode of the wells. Sequence data analysis from 454 pyrosequencing indicated and as the most abundant genera within the catchment system. The abundance of the OTU was statistically significant when correlated to the beginning of the abstraction phases, while no indicator OTUs could be determined for the end of the pumping phases. ACK-M1 cluster was proofed as indicator OTU for operating wells, whereas the OTUs were correlated with non operating wells. Well operation and resultant oxygen entry could serve as factors that altered the bacterial community structure and composition the most. Quantitative PCR analysis showed that genes related to the iron-reducing genus were present in nearly all of the samples. This study clearly showed an alteration within the bacterial communities dependent on the operation mode of the water wells.
    Keywords: Water Well ; Clogging ; Microbial Community ; Pyrosequencing ; Engineering
    ISSN: 0043-1354
    E-ISSN: 1879-2448
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  • 5
    Language: English
    In: Bioresource Technology, November 2016, Vol.219, pp.624-631
    Description: strain B6 exhibited efficient nitrate-dependent Fe(II) oxidation ability using nitrate as an electron acceptor. A continuous up-flow bioreactor that included an aerobic and an anoxic section was constructed, and strain B6 was added to the bioreactor as inocula to explore the application of microbial nitrate-dependent Fe(II) oxidizing (NDFO) efficiency in wastewater treatment. The maximum NRE (anoxic section) and TNRE of 46.9% and 79.7%, respectively, could be obtained at a C/N ratio of 5.3:1 in the influent with HRT of 17. Meanwhile, the taxonomy composition of the reactor was assessed, as well. The NDFO metabolism of strain B6 could be expected because of its relatively dominant position in the anoxic section, whereas potential heterotrophic nitrification and aerobic denitrification developed into the prevailing status in the aerobic section after 50 days of continuous operation.
    Keywords: Nitrate-Dependent Fe(II) Oxidation ; Biological Nitrogen Removal ; Microbial Community ; Up-Flow Reactor ; Agriculture ; Engineering ; Chemistry
    ISSN: 0960-8524
    E-ISSN: 1873-2976
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  • 6
    In: Nature, 2000, Vol.408(6812), p.580
    Description: Chlorobenzenes are toxic, highly persistent and ubiquitously distributed environmental contaminants that accumulate in the food chain. The only known microbial transformation of 1,2,3,5-tetrachlorobenzene (TeCB) and higher chlorinated benzenes is the reductive dechlorination to lower chlorinated benzenes under anaerobic conditions observed with mixed bacterial cultures. The lower chlorinated benzenes can subsequently be mineralized by aerobic bacteria. Here we describe the isolation of the oxygen-sensitive strain CBDB1, a pure culture capable of reductive dechlorination of chlorobenzenes. Strain CBDB1 is a highly specialized bacterium that stoichiometrically dechlorinates 1,2,3-trichlorobenzene (TCB), 1,2,4-TCB, 1,2,3,4-TeCB, 1,2,3,5-TeCB and 1,2,4,5-TeCB to dichlorobenzenes or 1,3,5-TCB. The presence of chlorobenzene as an electron acceptor and hydrogen as an electron donor is essential for growth, and indicates that strain CBDB1 meets its energy needs by a dehalorespiratory process. According to their 16S rRNA gene sequences, strain CBDB1, Dehalococcoides ethenogenes and several uncultivated bacteria form a new bacterial cluster, of which strain CBDB1 is the first, so far, to thrive on a purely synthetic medium.
    Keywords: Dehalococcoides Ethenogenes ; Biodegradation ; Electron Transfer ; Chlorobenzene ; Dichlorobenzene ; Hydrogen ; Dechlorination ; Organochlorine Compounds ; Respiration ; Trichlorobenzene ; Microbial Degradation ; Dehalorespiration ; Strain Cbdb1 ; Dehalorespiration ; Strain Cbdb1 ; Trichlorobenzene;
    ISSN: 0028-0836
    E-ISSN: 1476-4687
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  • 7
    Language: English
    In: Water Research, 2010, Vol.44(15), pp.4559-4569
    Description: The degradation of the pharmaceuticals phenazone and metamizole, two pyrazolone-derivates in widespread use, using biofilms created by natural organisms from the national park Unteres Odertal, Germany, were investigated. An analytical method based on LC-MS/MS was optimised to determine the substances phenazone and methylaminoantipyrine (MAA), the hydrolysis product of metamizole (also known as dipyrone), as well as their metabolites 1,5-dimethyl-1,2-dehydro-3-pyrazolone (DP), acetaminoantipyrine (AAA), formylaminoantipyrine (FAA) and 4-aminoantipyrine (AA). Performance characteristics of the method were evaluated in terms of recovery, standard deviation, coefficient of variation, method detection limits (MDL) and method quantification limits (MQL). Degradation studies of phenazone and MAA were conducted using a laboratory-scale continuous flow biofilm reactor fed with different nutrient media and with variable hydraulic retention times of 24 and 32 h. MAA was degraded rapidly to FAA and AA, while phenazone was not degraded under the prevailing conditions even after 32 h. By operating the bioreactor in batch mode to study the phenazone degradation potential of the biofilm under limiting nutrient conditions, an elimination rate of 85% phenazone was observed, but because of the slow elimination rate and aerobic conditions, the metabolite DP was not detected. In additional batch experiments using bacterial isolates from the natural biofilm to decompose phenazone, some bacterial strains were able to form DP from phenazone in marginal concentrations over the sampling period of eight weeks. Obviously, the microorganisms need a reasonably long time to adapt their metabolisms to enable the removal of phenazone from water samples.
    Keywords: Pharmaceuticals ; Pyrazolones ; Metamizole ; Biofilm Reactor ; Biodegradation ; Engineering
    ISSN: 0043-1354
    E-ISSN: 1879-2448
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  • 8
    Language: English
    In: Water Research, 01 April 2015, Vol.72, pp.218-226
    Description: A tertiary treatment step is required in current wastewater treatment plants to remove trace pollutants and thus to prevent their extensive occurrence in the aquatic environment. In this study, natural MnOx ore and natural zeolite were separately used to pack two lab-scale aerated biofilters, which were operated in approximately 1.5 years for the removal of frequently occurring pharmaceuticals, including carbamazepine (CBZ), diclofenac (DFC), and sulfamethoxazole (SMX), out of synthetic and real secondary effluents. Mn was added in the feeds to promote the growth of iron/manganese oxidizing bacteria which were recently found to be capable of degrading recalcitrant pollutants. An effective removal (80–90%) of DFC and SMX was observed in both biofilters after adaptation while a significant removal of CBZ was not found. Both biofilters also achieved an effective removal of spiked Mn , but a limited removal of carbon and nitrogen contents. Additionally, MnOx biofilter removed 50% of UV from real secondary effluent, indicating a high potential on the removal of aromatic compounds.
    Keywords: Biodegradation ; Biofiltration ; Tertiary Treatment ; Emerging Pollutant ; Biofilm ; Engineering
    ISBN: 9783038353799
    ISSN: 0043-1354
    E-ISSN: 1879-2448
    E-ISSN: 15580571
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  • 9
    Language: English
    In: Genome announcements, 10 March 2016, Vol.4(2)
    Description: Rheinheimera sp. strain F8 is a biofilm-forming gammaproteobacterium that has been found to produce large amounts of filamentous extracellular DNA. Here, we announce the de novo assembly of its genome. It is estimated to be 4,464,511 bp in length, with 3,970 protein-coding sequences and 92 RNA-coding sequences.
    Keywords: Prokaryotes;
    ISSN: 2169-8287
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  • 10
    Language: English
    In: Fungal Biology, September 2013, Vol.117(9), pp.660-672
    Description: Aquatic hyphomycetes play a key role in decomposition of submerged organic matter and stream ecosystem functioning. We examined the phylogenetic relationships among various genera of aquatic hyphomycetes belonging to the Leotiomycetes (Ascomycota) using sequences of internal transcribed spacer (ITS) and large subunit (LSU) regions of rDNA generated from 42 pure cultures including 19 ex-types. These new sequence data were analyzed together with additional sequences from 36 aquatic hyphomycetes and 60 related fungi obtained from GenBank. Aquatic hyphomycetes, characterized by their tetraradiate or sigmoid conidia, were scattered in nine supported clades within the Helotiales (Leotiomycetes). , , , , , , and are not monophyletic, with species from the same genus distributed among several major clades. The clade and the clade accommodated species from eight and six different genera, respectively. Thirteen aquatic hyphomycete taxa were grouped in the clade while twelve species clustered within the clade along with several amphibious ascomycetes. Species of and some species from four other aquatic genera were placed in the clade. It is evident that many aquatic hyphomycetes have relatives of terrestrial origin. Adaptation to colonize the aquatic environment has evolved independently in multiple phylogenetic lineages within the Leotiomycetes.
    Keywords: Biodiversity ; Evolution ; Molecular Systematics ; Taxonomy ; Botany
    ISSN: 1878-6146
    E-ISSN: 1878-6162
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