Bernard Ollivier

University of Science and Technology Houari Boumediene, Le Retour de la Chasse, Alger, Algeria

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Publications (147)307.66 Total impact

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    ABSTRACT: A novel anaerobic bacterium, strain ST07-YET, was isolated from a carbonate chimney of the Prony Hydrothermal Field (PHF) in New Caledonia. Cells were Gram-positive-staining, straight rods (0.7-0.8 x 3.0-5.0 µm). They were motile by the means of lateral flagella. Strain ST07-YET was mesophilic (optimum 35°C), moderately alkaliphilic and halotolerant (optimum pH 8.7 and 5 g l-1 NaCl). Elemental sulfur, sulfate, thiosulfate, sulfite, nitrate and nitrite were not used as terminal electron acceptors. Yeast extract, peptone, tryptone, casamino-acids, crotonate, pyruvate, galactose, maltose, sucrose, ribose, trehalose and glucose were used as carbon sources. Glucose fermentation led to acetate, H2 and CO2 formation. Arginine, serine, histidine, lysine, methionine and cysteine improved growth, but the Stickland reaction was negative for the combinations of amino acids tested. The major metabolic products from yeast extract fermentation were H2, acetate, butyrate, isobutyrate, isovalerate and propionate. The predominant cellular fatty acids were C16:0, C16:1 cis9, C14:0 and C16:1 cis7 (>5% of total fatty acids). The G+C content of the genomic DNA was 32.9 mol %. Phylogenetic analysis revealed that strain ST07-YET was most closely related to Clostridium sticklandii DSM 159T and Acetoanaerobium noterae NOT-3T (96.7% and 96.8% 16S rRNA gene sequence identity). On the basis of phylogenetic, chemotaxonomic and physiological properties, strain ST07-YET (= DSM 27512 = JCM 19400) is proposed as a novel species of the genus Acetoanaerobium, order Clostridiales, phylum Firmicutes, as Acetoanaerobium pronyense sp. nov..
    International Journal of Systematic and Evolutionary Microbiology 05/2015; DOI:10.1099/ijs.0.000307 · 2.80 Impact Factor
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    ABSTRACT: Mesotoga strain PhosAc3 was the first mesophilic cultivated member of the order Thermotogales. This genus currently contain two described species, M. prima and M. infera. Strain PhosAc3, isolated from a Tunisian digestor treating phosphogypsum, is phylogenetically closely related to M. prima strain MesG1.Ag.4.2 T. Strain PhosAc3 has a genome of 3.1 Mb with a G + C content of 45.2%. It contains 3,051 protein-coding genes of which 74.6% have their best reciprocal BLAST hit in the genome of the type species, strain MesG1.Ag.4.2 T. For this reason we propose to assign strain PhosAc3 as a novel ecotype of the Mesotoga prima species. However, in contrast with the M. prima type strain, (i) it does not ferment sugars but uses them only in the presence of elemental sulfur as terminal electron acceptor, (ii) it produces only acetate and CO 2 from sugars, whereas strain MesG1.Ag.4.2 T produces acetate, butyrate, isobutyrate, isovalerate, 2-methyl-butyrate and (iii) sulfides are also end products of the elemental sulfur reduction in theses growth conditions.
    Standards in Genomic Sciences 05/2015; 10(12). DOI:10.1186/1944-3277-10-12 · 3.17 Impact Factor
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    ABSTRACT: The occurrence of magnetotactic bacteria (MTB) on a Tunisian marine coast exposed to heavy metals pollution (Sfax, Gulf of Gabès, Mediterranean Sea) was investigated. The MTB population of this Southern Mediterranean coast was compared to the MTB populations previously investigated on the French Northern Mediterranean coast. A dominant MTB coccus morphotype was observed by microscopy analysis. By pyrosequencing technology, the analysis of the 16S ribosomal RNA (rDNA) revealed as much as 33 operational taxonomic sequence units (OTUs) close to sequences of MTB accessible in the databases. The majority were close to MTB sequences of the "Med group" of α-Proteobacteria. Among them, a dominant OTU_001 (99 % of the MTB sequences) affiliated within the Magnetococcales order was highlighted. Investigating the capacities of this novel bacterium to be used in bioremediation and/or depollution processes could be envisaged.
    Environmental Science and Pollution Research 03/2015; DOI:10.1007/s11356-015-4314-0 · 2.76 Impact Factor
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    ABSTRACT: A novel anaerobic, mesophilic, slightly halophilic sulfate-reducing bacterium designated strain Khaled BD4T was isolated from waters from a Tunisian thermal spring. The cells were vibrio-shaped or sigmoids (5-7 x 1-1.5 µm) and occurred singly or in pairs. Strain Khaled BD4T was Gram-staining-negative, motile, non-sporulated. It grew at temperature between 25 and 45°C (optimum 37 °C), at pH between 5.5 and 8.3 (optimum pH 7.0) and with NaCl between 0.5-8% (optimum 3%). It required vitamins or yeast extract for growth. Sulfate, thiosulfate, sulfite and elemental sulfur served as terminal electron acceptors, but not fumarate, nitrate or nitrite. Strain Khaled BD4T utilized H2 in the presence of 2 mM acetate (carbon source), but also lactate, formate, pyruvate and fumarate in the presence of sulfate. Lactate was incompletely oxidized to acetate. Amongst substrates used, only pyruvate was fermented. Desulfoviridin and c-type cytochrome were present. The G + C content of the DNA was 54.6 mol%. The main fatty acids were anteiso-C15:0, iso-C18:0, iso-C17:0 and iso-C14:0. Phylogenetic analysis of the 16S rRNA gene sequence indicated that strain Khaled BD4T had Desulfovibrio giganteus (96.7% similarity) as its closest phylogenetic relative. On the basis of the 16S rRNA gene sequence comparisons together with genetic and physiological characteristics, strain Khaled BD4T is proposed to be assigned to a new bacterial species, for which the name Desulfovibrio biadhensis is proposed. The type strain is Khaled BD4T (= DSM 28904T = JCM 30146T).
    International Journal of Systematic and Evolutionary Microbiology 01/2015; 65(Pt 4). DOI:10.1099/ijs.0.000088 · 2.80 Impact Factor
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    ABSTRACT: The Voltri Massif is an ophiolitic complex located in the Ligurian Alps close to the city of Genova (Northern Italy) where several springs discharge high pH (up to 11.7), low salinity waters produced by the active serpentinization of the ultramafic basement. Mixing of these hyperalkaline waters with the river waters along with the uptake of atmospheric carbon dioxide forms brownish carbonate precipitates covering the bedrock at the springs. Diverse archaeal and bacterial communities were detected in these carbonate precipitates using 454 pyrosequencing analyses of 16S ribosomal RNA (rRNA) genes. Archaeal communities were dominated by members of potential methane-producing and/or methane-oxidizing Methanobacteriales and Methanosarcinales (Euryarchaeota) together with ammonia-oxidizing Nitrososphaerales (Thaumarchaeota) similar to those found in other serpentinization-driven submarine and terrestrial ecosystems. Bacterial communities consisted of members of the Proteobacteria, Actinobacteria, Planctomycetes, Bacteroidetes, Chloroflexi, and Verrucomicrobia phyla, altogether accounting for 92.2 % of total retrieved bacterial 16S rRNA gene sequences. Amongst Bacteria, potential chemolithotrophy was mainly associated with Alpha- and Betaproteobacteria classes, including nitrogen-fixing, methane-oxidizing or hydrogen-oxidizing representatives of the genera Azospirillum, Methylosinus, and Hydrogenophaga/'Serpentinomonas', respectively. Besides, potential chemoorganotrophy was attributed mainly to representatives of Actinobacteria and Planctomycetales phyla. The reported 16S rRNA gene data strongly suggested that hydrogen, methane, and nitrogen-based chemolithotrophy can sustain growth of the microbial communities inhabiting the carbonate precipitates in the hyperalkaline springs of the Voltri Massif, similarly to what was previously observed in other serpentinite-hosted ecosystems.
    Environmental Science and Pollution Research 01/2015; DOI:10.1007/s11356-015-4113-7 · 2.76 Impact Factor
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    ABSTRACT: Extreme physicochemical conditions (low and high temperatures, high salinity, low and high pH, high hydrostatic pressure, etc.) existing on Earth are compatible with the occurrence of microbial life. The diversity and metabolic features of microbial trophic groups inhabiting extreme environments (cold, hot, saline, acidic, alkaline, and deep marine) are described. They include hydrothermal vents, acid springs, hypersaline and/or alkaline lakes, permafrost, and deep-sea environments, etc. To live or survive under such drastic conditions, prokaryotes (Bacteria or Archaea) have developed a variety of physiological and metabolic strategies allowing them to adapt to in situ extreme conditions. Many of these extremophiles are recognized to be of industrial interest or to be potential candidates for future biotechnological applications. Clearly, the discovery of extremophiles living in terrestrial, subterrestrial, and deep marine environments has changed our perception of microbial life. One or a combination of extreme physicochemical conditions that they have to face may have prevailed in the primitive atmosphere and favored early extremophilic life not only on Earth but perhaps also on other planets.
    Environmental Microbiology: Fundamentals and Applications, 01/2015: pages 353-394; , ISBN: 978-94-017-9117-5
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    ABSTRACT: Magnetotactic bacteria synthesize intracellular magnetite and/or greigite magnetosome crystals. They play a significant role in both iron and sulfur cycles in sedimentary aquatic environments. To get insight into the bio-geochemical contribution of MTB, more studies concerning their ecology and their distribution in diverse habitats are necessary. The MTB community of an oil-industry polluted area of the French Mediterranean coast has been previously investigated. Here, we investigate the MTB community from coastal sediments of a Mediterranean pristine area using optical and transmission electron microscopy and phylogenetic analysis based on 16S rRNA gene sequences. A particularly high diversity of MTB was observed, with cocci phylogenetically distributed across the order Magnetococcales, including a novel cluster with sequences from the Mediterranean Sea designated as “Med group”, and novel morphotypes.
    Current Microbiology 12/2014; 70(4). DOI:10.1007/s00284-014-0745-y · 1.36 Impact Factor
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    ABSTRACT: A new anaerobic alkaliphilic H2-producer was isolated from a serpentinite-hosted ecosystem.•16S rDNA sequence analysis of strain PROH2 revealed its assignment to a novel Clostridium species.•The maximum H2 productions were obtained at 37 °C, initial pH 9.5 and 2 g/L of glucose.•The isolate is a good candidate for H2 production under alkaline conditions due to its high H2 yield.•It is the first anaerobic microorganism producing H2 at both high pH and low salinity.
    International Journal of Hydrogen Energy 11/2014; 39. DOI:10.1016/j.ijhydene.2014.09.111 · 2.93 Impact Factor
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    ABSTRACT: A new Gram-positive-staining, non-sporulating, mesophilic, amino acid-degrading anaerobic bacterium, designated strain OTA 102T (T = type strain), was isolated from an anaerobic sequencing batch reactor treating cooking tuna wastewater. The cells were curved rods (0.6-2.5 x 0.5 µm) and occurred singly or in pairs. The strain was motile by means of one lateral flagellum. Strain OTA 102T grew at temperatures between 30° and 45°C (optimum 40°C), pH between 6.0 and 8.4 (optimum 7.2), and NaCl between 1-5% (optimum 2%). Strain OTA 102T required yeast extract for growth. Serine, threonine, glycine, cysteine, citrate, fumarate, α-ketoglutarate and pyruvate were fermented. When cocultured with Methanobacterium formicicum as the hydrogen scavenger, strain OTA 102T oxidized alanine, valine, leucine, isoleucine, aspartate, tyrosine, histidine, methionine, histidine and asparagine. The genomic DNA G+C content of strain OTA 102T was 41.7 mol %. The main fatty acid was iso-C15:0 (58 %). Phylogenetic analysis of the 16S rRNA gene sequence indicated that strain OTA 102T was related to Aminobacterium colombiense and Aminobacterium mobile (95.5 % and 95.2 % of similarity, respectively), phylum Synergistetes. On the basis of phylogenetic, genetic, and physiological characteristics, strain OTA 102T is proposed to be assigned to a new species of the genus Aminobacterium, A. thunnarium sp. nov.. The type strain is OTA 102T (=DSM 27500T= JCM 19320T). Copyright © 2014, the Society for General Microbiology.
    International Journal of Systematic and Evolutionary Microbiology 11/2014; 65(Pt 2). DOI:10.1099/ijs.0.068965-0 · 2.80 Impact Factor
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    ABSTRACT: A novel anaerobic, alkaliphilic, Gram-positive staining bacterium was isolated from a hydrothermal chimney in the Prony Bay, New Caledonia. This strain designated FatMR1(T) grew at temperatures from 20 to 55 °C (optimum 37 °C) and at pH between 7.5 and 10.5 (optimum 8.8-9). NaCl is not required for growth (optimum 0.2-0.5 %), but is tolerated up to 3 %. Sulfate, thiosulfate, elemental sulfur, sulfite, nitrate and nitrite are not used as terminal electron acceptors. Strain FatMR1(T) fermented pyruvate, yeast extract, peptone and biotrypcase and used fructose as the only sugar. The main fermentation products from fructose and proteinaceous compounds (e.g. peptone and biotrypcase) were acetate, H2 and CO2. Crotonate was disproportionated to acetate and butyrate. The predominant cellular fatty acids were C14:0 and C16:0. The G + C content of the genomic DNA was 37.1 mol %. On the basis of phylogenetic, genetic, and physiological properties, strain FatMR1(T) (=DSM 25890(T), =JCM 18390(T)) belonging to the phylum Firmicutes, class Clostridia, order Clostridiales, is proposed as a novel species of the genus Alkaliphilus, A. hydrothermalis sp. nov.
    Extremophiles 10/2014; DOI:10.1007/s00792-014-0697-y · 2.17 Impact Factor
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    ABSTRACT: Strain LTF Kr01, a novel mesophilic, anaerobic, halotolerant, rod-shaped bacterium was isolated from a drain at the bottom of a corroded kerosene storage tank of the Société Tunisienne des Industries de Raffinage (STIR), Bizerte, North Tunisia. Cells are Gram- positive rods, and occur singly or in pairs, motile by one lateral flagellum. Strain LTF Kr01 grows at temperatures between 15°C and 40°C (optimum 30°C), pH between 5.5 and 8.1 (optimum 7.2) and NaCl concentration between 0 and 50 g l-1 (optimum 5 g l-1). It reduces thiosulfate and elemental sulfur into sulfide, but not sulfate and or sulfite. It utilizes a large number wide range of carbohydrates (cellobiose, D-glucose, D-fructose, D-mannitol,D-ribose, D-sucrose, D-xylose, D-maltose, D-galactose, starch, and trehalose), and produces acetate, CO2, and H2, as end products from glucose fermentation. The DNA G+C content is 37.4 mol %. The predominant cellular fatty acids are C14:0 and C16:0. Phylogenetic analysis of the 16SrRNA gene sequence suggests that Fusibacter tunisiensis is its closest relative (identity of 94.6%). Based on phenotypic, phylogenetic and genotypic taxonomic characteristics, strain LTF Kr01T is proposed described as a novel species of the genus Fusibacter, order Clostridiales for which the name F. bizertensis sp. nov. is proposed. The type strain is LTF Kr01T (= DSM 28034 =JCM 19376).
    International Journal of Systematic and Evolutionary Microbiology 10/2014; 65(Pt 1). DOI:10.1099/ijs.0.066183-0 · 2.80 Impact Factor
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    ABSTRACT: RNA-seq was used to study the response of Desulfovibrio hydrothermalis, isolated from a deep-sea hydrothermal chimney on the East-Pacific Rise at a depth of 2,600 m, to various hydrostatic pressure growth conditions. The transcriptomic datasets obtained after growth at 26, 10 and 0.1 MPa identified only 65 differentially expressed genes that were distributed among four main categories: aromatic amino acid and glutamate metabolisms, energy metabolism, signal transduction, and unknown function. The gene expression patterns suggest that D. hydrothermalis uses at least three different adaptation mechanisms, according to a hydrostatic pressure threshold (HPt) that was estimated to be above 10 MPa. Both glutamate and energy metabolism were found to play crucial roles in these mechanisms. Quantitation of the glutamate levels in cells revealed its accumulation at high hydrostatic pressure, suggesting its role as a piezolyte. ATP measurements showed that the energy metabolism of this bacterium is optimized for deep-sea life conditions. This study provides new insights into the molecular mechanisms linked to hydrostatic pressure adaptation in sulfate-reducing bacteria.
    PLoS ONE 09/2014; 9(9):e106831. DOI:10.1371/journal.pone.0106831 · 3.53 Impact Factor
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    ABSTRACT: To date, xylanases have expanded their use in many processing industries, such as pulp, paper, food, and textile. This study aimed the production and partial characterization of a thermostable xylanase from a novel thermophilic anaerobic bacterium Caldicoprobacter algeriensis strain TH7C1(T) isolated from a northeast hot spring in Algeria. The obtained results showed that C. algeriensis xylanase seems not to be correlated with the biomass growth profile whereas the maximum enzyme production (140.0 U/ml) was recorded in stationary phase (18 h). The temperature and pH for optimal activities were 70 °C and 11.0, respectively. The enzyme was found to be stable at 50, 60, 70, and 80 °C, with a half-life of 10, 9, 8, and 4 h, respectively. Influence of metal ions on enzyme activity revealed that Ca(+2) enhances greatly the relative activity to 151.3 %; whereas Hg(2+) inhibited significantly the enzyme. At the best of our knowledge, this is the first report on the production of xylanase by the thermophilic bacterium C. algeriensis. This thermo- and alkaline-tolerant xylanase could be used in pulp bleaching process.
    Applied biochemistry and biotechnology 08/2014; DOI:10.1007/s12010-014-1153-2 · 1.74 Impact Factor
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    ABSTRACT: The shallow submarine hydrothermal field of the Prony Bay (New Caledonia) discharges hydrogen- and methane-rich fluids with low salinity, temperature (<40°C) and high pH (11) produced by the serpentinization reactions of the ultramafic basement into the lagoon seawater. They are responsible for the formation of carbonate chimneys at the lagoon seafloor. CE-SSCP fingerprinting, quantitative PCR and sequence analysis of 16S rRNA genes revealed changes in microbial community structure, abundance and diversity depending on the location, water depth and structure of the carbonate chimneys. The low archaeal diversity was dominated by few uncultured Methanosarcinales similar to those found in other serpentinization-driven submarine and subterrestrial ecosystems (e.g. Lost City, The Cedars). The most abundant and diverse bacterial communities were mainly composed of Chloroflexi, Deinococcus-Thermus, Firmicutes, and Proteobacteria. Functional gene analysis revealed similar abundance and diversity of both Methanosarcinales methanoarchaea and Desulfovibrionales- and Desulfobacterales sulfate-reducers in the studied sites. Molecular studies suggest that redox reactions involving hydrogen, methane and sulfur compounds (e.g. sulfate) are the energy driving forces of the microbial communities inhabiting the Prony hydrothermal system.
    Environmental Microbiology Reports 06/2014; 6(6). DOI:10.1111/1758-2229.12184 · 3.26 Impact Factor
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    ABSTRACT: The thermophilic sulfate-reducing archaeon Archaeoglobus fulgidus strain VC-16 (DSM 4304), which is known to oxidize fatty acids and n-alkenes, was shown to oxidize saturated hydrocarbons (n-alkanes in the range C10-C21) with thiosulfate or sulfate as a terminal electron acceptor. The amount of n-hexadecane degradation observed was in stoichiometric agreement with the theoretically expected amount of thiosulfate reduction. One of the pathways used by anaerobic microorganisms to activate alkanes is addition to fumarate that involves alkylsuccinate synthase as a key enzyme. A search for genes encoding homologous enzymes in A. fulgidus identified the pflD gene (locus-tag AF1449) that was previously annotated as a pyruvate formate lyase. A phylogenetic analysis revealed that this gene is of bacterial origin and was likely acquired by A. fulgidus from a bacterial donor through a horizontal gene transfer. Based on three-dimensional modeling of the corresponding protein and molecular dynamic simulations, we hypothesize an alkylsuccinate synthase activity for this gene product. The pflD gene expression was upregulated during the growth of A. fulgidus on an n-alkane (C16) compared with growth on a fatty acid. Our results suggest that anaerobic alkane degradation in A. fulgidus may involve the gene pflD in alkane activation through addition to fumarate. These findings highlight the possible importance of hydrocarbon oxidation at high temperatures by A. fulgidus in hydrothermal vents and the deep biosphere.The ISME Journal advance online publication, 24 April 2014; doi:10.1038/ismej.2014.58.
    The ISME Journal 04/2014; 8(11). DOI:10.1038/ismej.2014.58 · 9.27 Impact Factor
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    ABSTRACT: Members of the deep-branching order Thermotogales are widespread in various terrestrial, submarine and subterrestrial extreme environments. This bacterial order included both thermophilic and hyperthermophilic anaerobic microorganisms so far pertaining to ten genera. It is only recently (2011) that cultivation of a mesophilic member of this order belonging to a novel genus, Mesotoga, has been successful. All members, with the exception of Mesotoga spp., are recognized as high hydrogen producers having possible applications in biotechnology with a peculiar emphasis for members of the genus Thermotoga (e.g. T. maritima and T. neapolitana). The ecology, phylogeny and metabolism linked to hydrogen production of these bacteria, are reviewed.
    Microbial BioEnergy: Hydrogen Production, Edited by Zannoni D, De Philippis R, 03/2014: chapter Members of the Order Thermotogales: From Microbiology to Hydrogen Production: pages 199; Springer., ISBN: 978-94-017-8553-2
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    ABSTRACT: A novel thermotolerant, anaerobic, Gram-positive staining, spore-forming bacterium was isolated from a hydrothermal chimney in the Prony Bay, New Caledonia. This strain designated FatNI3T grew at temperatures from15 to 55 °C (optimum 30°C) and at pH between 5.8 and 8.9 (optimum 7.7). It is slightly halophilic requiring at least 0.5% NaCl for growth (optimum 2.5-3.0%), and supporting it up to 6 %. Sulfate, thiosulfate, elemental sulfur, sulfite, nitrate and nitrite were not used as terminal electron acceptors. Growth of strain FatNI3T was inhibited in the presence of sulfite (2 mM) or nitrite (2 mM). Strain FatNI3T fermented cellobiose, glucose, mannose, maltose, sucrose, galactose, lactose, ribose, fructose, rhamnose, raffinose, xylose, yeast extract, peptone and biotrypcase. The main fermentation products from glucose metabolism were acetate, ethanol, H2 and CO2. The predominant cellular fatty acids were iso-C15:0, anteiso-C15:0. The main polar lipids consisted of diphosphatidylglycerol, phosphatidylglycerol, glycolipids and phospholipids. The G+C content of the genomic DNA was 36.6 mol%. On the basis of phylogenetic and physiological properties, strain FatNI3T (= DSM 25904 = JCM 18391) belonging to the phylum Firmicutes, class Clostridia, order Clostridiales, is proposed as a novel species of the genus Vallitalea, V. pronyensis sp. nov..
    International Journal of Systematic and Evolutionary Microbiology 01/2014; DOI:10.1099/ijs.0.055756-0 · 2.80 Impact Factor
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    ABSTRACT: This work aims to study the by-products generated by the anaerobic degradation process of synthetic wastewater containing indigo dye. These by-products were analysed and identified by both high performance liquid chromatography (HPLC) and nuclear magnetic resonance (1H NMR). HPLC results showed the dependence of the by-products to the operating conditions. The obtained HPLC chromatogram at the end of the experiments (Run 1) reveals different fractions, with at least eight distinguishable by-products. Increasing the hydraulic retention time from 1 to 5 days (Run 5) which corresponding to the start up of the bioreactor caused a significant change of the obtained HPLC chromatogram, with the decrease of the number of these by-products to only 3 ones. 1H NMR analysis was realised with three representative fractions. The results showed that hypothetical structure of the by-products corresponding to aromatic cycles 1,2-disubstituted and possessing an axial symmetry similar to the phthalate groups.
    Desalination and water treatment 12/2013; 53(7):1-9. DOI:10.1080/19443994.2013.870744 · 1.17 Impact Factor
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    ABSTRACT: Gram-positive spore-forming sulfate reducers and particularly members of the genus Desulfotomaculum are commonly found in the subsurface biosphere by culture based and molecular approaches. Due to their metabolic versatility and their ability to persist as endospores. Desulfotomaculum spp. are well-adapted for colonizing environments through a slow sedimentation process. Because of their ability to grow autotrophically (H2/CO2) and produce sulfide or acetate, these microorganisms may play key roles in deep lithoautotrophic microbial communities. Available data about Desulfotomaculum spp. and related species from studies carried out from deep freshwater lakes, marine sediments, oligotrophic and organic rich deep geological settings are discussed in this review.
    Frontiers in Microbiology 12/2013; 4:362. DOI:10.3389/fmicb.2013.00362 · 3.94 Impact Factor

Publication Stats

2k Citations
307.66 Total Impact Points

Institutions

  • 2014
    • University of Science and Technology Houari Boumediene
      • Faculty of Biological Sciences
      Le Retour de la Chasse, Alger, Algeria
  • 1986–2014
    • Aix-Marseille Université
      • Laboratoire de Chimie Bactérienne (UMR 7283 LCB)
      Marsiglia, Provence-Alpes-Côte d'Azur, France
    • University of California, Los Angeles
      • School of Public Health
      Los Ángeles, California, United States
  • 2002–2013
    • Institute of Research for Development
      Marsiglia, Provence-Alpes-Côte d'Azur, France
  • 2010
    • l' Institut National des Sciences Appliquées et de Technologie (Tunisienne)
      Tunis-Ville, Tūnis, Tunisia
  • 1993–1995
    • French National Centre for Scientific Research
      Lutetia Parisorum, Île-de-France, France