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Université de Neuchâtel

Bio-inoculation of yerba mate seedlings (Ilex paraguariensis St. Hill.) with native plant growth-promoting rhizobacteria : a sustainable alternative to improve crop yield

Bergottini, Veronica M ; Otegui, M. B ; Sosa, D. A ; Zapata, P. D ; Mulot, Matthieu ; Rebord, Maxime ; Zopfi, Jakob ; Wiss, F ; Benrey, Betty ; Junier, Pilar

In: Biology and fertility of soils, 2015, vol. 51, no. 6, p. 749-755

In this study, the role of native plant growth-promoting rhizobacteria (PGPR) as bio-inoculants was assessed as an alternative to ameliorate Ilex paraguariensis St. Hill. growth in nursery comparing poorer (soil) versus richer (compost) substrates. Twelve rhizospheric strains isolated from yerba mate plantations were evaluated in vitro for their potential as PGPRs. Three isolates,...

Université de Neuchâtel

Intrinsic biodegradation potential of aromatic hydrocarbons in an alluvial aquifer - Potentials and limits of signature metabolite analysis and two stable isotope-based techniques

Morasch, Barbara ; Hunkeler, Daniel ; Zopfi, Jakob ; Temime, B ; Höhener, Patrick

In: Water Research, 2011, vol. 45, p. 4459-4469

Three independent techniques were used to assess the biodegradation of monoaromatic hydrocarbons and low-molecular weight polyaromatic hydrocarbons in the alluvial aquifer at the site of a former cokery (Flémalle, Belgium). Firstly, a stable carbon isotope-based field method allowed quantifying biodegradation of monoaromatic compounds in situ and confirmed the degradation of...

Université de Neuchâtel

Particle-Size Distribution As Indicator for Fecal Bacteria Contamination of Drinking Water from Karst Springs

Pronk, Michiel ; Goldscheider, Nico ; Zopfi, Jakob

In: Environmental Science & Technology, 2007, vol. 41, no. 24, p. 8400-8405

Continuous monitoring of particle-size distribution (PSD), total organic carbon (TOC), turbidity, discharge and physicochemical parameters, together with analyses of fecal indicator bacteria, particularly Escherichia coli, made it possible to better understand the processes governing pathogen transport in karst groundwater and to establish PSD as indicator for possible microbial...

Université de Neuchâtel

Characterizing Water Circulation and Contaminant Transport in Lake Geneva Using Bacteriophage Tracer Experiments and Limnological Methods

Goldscheider, Nicola ; Haller, Laurence ; Poté, John ; Wildi, Walter ; Zopfi, Jakob

In: Environmental Science & Technology, 2007, vol. 41, no. 15, p. 5252–5258

Multi-tracer tests with three types of marine bacteriophages (H4/4, H6/1, and H40/1), together with various limnological methods, including physicochemical depth profiling, surface drifters, deep current measurements, and fecal indicator bacteria analyses, have been applied to characterize water circulation and pathogen transport in the Bay of Vidy (Lake Geneva, Switzerland). The experimental...

Université de Neuchâtel

Evaluating the fate of chlorinated ethenes in streambed sediments by combining stable isotope, geochemical and microbial methods

Abe, Yumiko ; Aravena, Ramon ; Zopfi, Jakob ; Parker, Beth ; Hunkeler, Daniel

In: Journal of Contaminant Hydrology, 2009, vol. 107, no. 1-2, p. 10-21

The occurrence of chlorinated ethene transformation in a streambed was investigated using concentration and carbon isotope data from water samples taken at different locations and depths within a 15×25 ms tudy area across which a tetrachloroethene (PCE) plume discharges. Furthermore, it was evaluated how the degree of transformation is related to groundwater discharge rates, redox conditions,...

Université de Neuchâtel

Carbon and chlorine isotope fractionation during aerobic oxidation and reductive dechlorination of vinyl chloride and cis-1,2-dichloroethene

Abe, Yumiko ; Aravena, Ramon ; Zopfi, Jakob ; Shouakar-Stash, O ; Cox, E ; Roberts, J.D ; Hunkeler, Daniel

In: Environmental science & technology, 2009, vol. 43, no. 1, p. 101-107

The study investigated carbon and chlorine isotope fractionation during aerobic oxidation and reductive dechlorination of vinyl chloride (VC) and cis-1,2-dichloroethene (cDCE). The experimental data followed a Rayleigh trend. For aerobic oxidation, the average carbon isotope enrichment factors were -7.2‰ and-8.5‰ for VC and cDCE, respectively, while average chlorine isotope enrichment...