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Julien Maillard

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Publications associées (48)

Comparative genomics of the genus Desulfitobacterium

Julien Maillard, Hauke Smidt

The Desulfitobacterium genus comprises anaerobic Gram-positive bacteria, of which the majority are facultative organohalide respirers. We here present the genomes of eight strains of Desulfitobacterium spp., including five strains of Desulfitobacterium haf ...

2017

Arsenic methylation dynamics in a rice paddy soil anaerobic enrichment culture

Julien Maillard, Rizlan Bernier-Latmani, Alexandre Bagnoud, Leia Soraya Véronique Falquet, Matthew Charles Reid

Methylated arsenic (As) species represent a significant fraction of the As accumulating in rice grains, and there are geographic patterns in the abundance of methylated arsenic in rice that are not understood. The microorganisms driving As biomethylation i ...

Amer Chemical Soc2017

Evolution of microbial communities and nutrient removal performances in aerobic granular sludge sequencing batch reactor during change of substrate

Aline Sondra Adler, Christof Holliger, Julien Maillard, Valérie Berclaz, Marie Christelle Horisberger

• Aerobic granular sludge (AGS) is a promising alternative wastewater treatment to the conventional activated sludge system. As AGS has enhanced settling abilities and provides different redox conditions across the granules at the same time, the processes ...

2016

Phage-dependent variability of Candidatus ‘Accumulibacter phosphatis’ populations in aerobic granular sludge

Aline Sondra Adler, Christof Holliger, Julien Maillard, Jacques Rougemont

During the past 20 years, aerobic granular sludge (AGS) has been extensively studied with the aim to develop an attractive alternative to conventional activated sludge for wastewater treatment. The phosphate-accumulating organism (PAO) Candidatus ‘Accumuli ...

2015

Functional genomics of corrinoid starvation in the organohalide-respiring bacterium Dehalobacter restrictus strain PER-K23

Christof Holliger, Julien Maillard, Hauke Smidt, Yue Lu, Aamani Rupakula Boyanapalli

De novo comnoid biosynthesis represents one of the most complicated metabolic pathways in nature. Organohalide-respiring bacteria (OHRB) have developed different strategies to deal with their need of corrinoid, as it is an essential cofactor of reductive d ...

Frontiers Media SA2015

Fe(III) reduction during pyruvate fermentation by Desulfotomaculum reducens strain MI-1

Elena Suvorova Buffat, Julien Maillard, Rizlan Bernier-Latmani, Elena Cristina Dalla Vecchia

Desulfotomaculum reducens MI-1 is a Gram-positive, sulfate-reducing bacterium also capable of reducing several metals, among which is Fe(III). Very limited knowledge is available on the potential mechanism(s) of metal reduction among Gram-positive bacteria ...

Wiley-Blackwell2014

Multiple Dual C–Cl Isotope Patterns Associated with Reductive Dechlorination of Tetrachloroethene

Christof Holliger, Julien Maillard, Géraldine Florence Buttet

Dual isotope slopes are increasingly used to identify transformation pathways of contaminants. We investigated if reductive dechlorination of tetrachloroethene (PCE) by consortia containing bacteria with different reductive dehalogenases (rdhA) genes can l ...

Amer Chemical Soc2014

Multilevel Correlations in the Biological Phosphorus Removal Process: from Bacterial Enrichment to Conductivity-Based Metabolic Batch Tests and Polyphosphatase Assays

Christof Holliger, Julien Maillard, David Gregory Weissbrodt, Alessandro Brovelli, Alexandre Chabrelie, Jonathan May

Enhanced biological phosphorus removal (EBPR) from wastewater relies on the preferential selection of active polyphosphate-accumulating organisms (PAO) in the underlying bacterial community continuum. Efficient management of the bacterial resource requires ...

Wiley-Blackwell2014

Use of silicate minerals for long-term pH control during reductive dechlorination of high tetrachloroethene concentrations in continuous flow-through columns

Christof Holliger, Julien Maillard, Emmanuelle Rohrbach, David Andrew Barry, Alessandro Brovelli, Elsa Marina Lacroix

The long-term buffering potential of three silicate minerals (diopside, fayalite and forsterite) present as fine particles in porous quartz sand medium was evaluated in flow-through column experiments over a period of 6.5 months. The columns were operated ...

Elsevier2014

Nitrogen Removal over Nitrite by Aeration Control in Aerobic Granular Sludge Sequencing Batch Reactors

Christof Holliger, Julien Maillard, Samuel Lochmatter

This study investigated the potential of aeration control for the achievement of N-removal over nitrite with aerobic granular sludge in sequencing batch reactors. N-removal over nitrite requires less COD, which is particularly interesting if COD is the lim ...

Mdpi Ag2014

Complete genome sequence of Dehalobacter restrictus PER-K23T

Christof Holliger, Julien Maillard, Hauke Smidt

Dehalobacter restrictus strain PER-K23 (DSM 9455) is the type strain of the species Dehalobacter restrictus. D. restrictus strain PER-K23 grows by organohalide respiration, coupling the oxidation of H2 to the reductive dechlorination of tetra- or trichloro ...

2013

Influence of treatment conditions on the oxidation of micropollutants by Trametes versicolor laccase

Luca Rossi, Christof Holliger, Julien Maillard, Jonas Margot, David Andrew Barry

Many organic compounds present at low concentrations in municipal wastewater, such as various pharmaceuticals and biocides, are recalcitrant in conventional wastewater treatment plants (WWTPs). To improve their biodegradation, oxidoreductase enzymes such a ...

Elsevier2013

Functional Genotyping of Sulfurospirillum spp. in Mixed Cultures Allowed the Identification of a New Tetrachloroethene Reductive Dehalogenase

Christof Holliger, Julien Maillard, Géraldine Florence Buttet

Reductive dehalogenases are the key enzymes involved in the anaerobic respiration of organohalides such as the widespread groundwater pollutant tetrachloroethene. The increasing number of available bacterial genomes and metagenomes gives access to hundreds ...

Amer Soc Microbiology2013

The restricted metabolism of the obligate organohalide respiring bacterium Dehalobacter restrictus: lessons from tiered functional genomics

Christof Holliger, Julien Maillard, Hauke Smidt, Aamani Rupakula Boyanapalli

Dehalobacter restrictus strain PER-K23 is an obligate organohalide respiring bacterium, which displays extremely narrow metabolic capabilities. It grows only via coupling energy conservation to anaerobic respiration of tetra- and trichloroethene with hydro ...

2013

Bacterial versus fungal laccase: potential for micropollutant degradation

Christof Holliger, Julien Maillard, Jonas Margot, David Andrew Barry

Relatively high concentrations of micropollutants in municipal wastewater treatment plant (WWTP) effluents underscore the necessity to develop additional treatment steps prior to discharge of treated wastewater. Microorganisms that produce unspecific oxida ...

2013

Diversity of cobalamin riboswitches in the corrinoid-producing organohalide respirer Desulfitobacterium hafniense

Christof Holliger, Julien Maillard, Emmanuelle Rohrbach, Aurélie Duret

The strategic adaptation of prokaryotes in polluted niches involves the efficient regulation of their metabolism. The obligate anaerobe and metabolically versatile Desulfitobacterium hafniense reductively dechlorinates halogenated organic compounds (so-cal ...

American Society for Microbiology2013

Overlapping transport and chaperone-binding functions within a bacterial twin-arginine signal peptide

Julien Maillard

The twin-arginine translocation (Tat) pathway is a protein targeting system present in many prokaryotes. The physiological role of the Tat pathway is the transmembrane translocation of fully-folded proteins, which are targeted by N-terminal signal peptides ...

Wiley-Blackwell2012

PyroTRF-ID: a novel bioinformatics methodology for the affiliation of terminal-restriction fragments using 16S rRNA gene pyrosequencing data

Christof Holliger, Julien Maillard, David Gregory Weissbrodt, Lucas Sinclair, Pierre Rossi, Noam Shani, Jacques Rougemont

Background: In molecular microbial ecology, massive sequencing is gradually replacing classical fingerprinting techniques such as terminal-restriction fragment length polymorphism (T-RFLP) combined with cloning-sequencing for the characterization of microb ...

BioMed Central2012

Segmented Field OFFGEL® Electrophoresis

Hubert Girault, Julien Maillard, Fernando Cortes Salazar, Dmitry Momotenko, Elena Tobolkina

A multielectrode setup for protein OFFGEL electrophoresis that significantly improves protein separation efficiency has been developed. Here, the electric field is applied by segments between seven electrodes connected in series to six independent power su ...

Wiley-Blackwell2012

An unusual tandem-domain rhodanese harbouring two active sites identified in Desulfitobacterium hafniense

Christof Holliger, Julien Maillard, Emmanuelle Rohrbach, Laure Prat

The rhodanese protein domain is common throughout all kingdoms of life and is characterized by an active site cysteine residue that is able to bind sulfane sulfur and catalyse sulfur transfer. No unique function has been attributed to rhodanese-domain-cont ...

Wiley-Blackwell2012

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