Jean-Philippe Bellenger

Jean-Philippe Bellenger
Université de Sherbrooke | UdeS · Department of Chemistry

About

92
Publications
11,961
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2,566
Citations
Additional affiliations
October 2005 - June 2010
Princeton University
Position
  • Research Associate

Publications

Publications (92)
Article
Organic matter regulates the availability of important trace elements in aquatic and terrestrial ecosystems by acting as a source and container for microbes. To overcome the limitation of trace elements, nitrogen-fixing bacteria, for example, release low-molecular-weight chelators (metallophores), which scavenge the essential cofactors of the nitro...
Article
Full-text available
Feather mosses are abundant cryptogams of the boreal forest floor and shelter a broad diversity of bacteria who have important ecological functions (e.g., decomposition, nutrient cycling). In particular, nitrogen (N2-) fixation performed by feather moss-associated diazotrophs constitutes an important entry of nitrogen in the boreal forest ecosystem...
Article
Full-text available
Background The small number of studies examining the association of prenatal acetaminophen with birth outcomes have all relied on maternal self-report. It remains unknown whether prenatal acetaminophen exposure measured in a biological specimen is associated with birth outcomes. Objectives To investigate the association of acetaminophen measured i...
Article
Full-text available
Moss‐associated cyanobacteria nitrogen (N2‐) fixation can contribute to support moss growth and constitutes a major source of new N in boreal forest ecosystems. The biomass of moss‐colonizing cyanobacteria and their N2‐fixation are usually considered linearly correlated. Yet, recent evidence has shown that cyanobacterial biomass and N2‐fixation can...
Article
The contribution of Coarse Woody Debris (CWD) to N inputs in boreal ecosystems has been reported in intensively managed Scandinavian forests in Europe and in Pacific coastal rainforest in North America. These estimates range from 0.085 to 2 kg N ha⁻¹ y⁻¹. Data from Eastern Canadian forests that receive fewer sylvicultural treatments than do Scandin...
Article
The increasing exploitation of the unconventional bitumen-derived oils from Alberta (Canada) have raised new environmental concerns because they are inherently different than conventional oils. Previous studies mainly focused on diluted bitumen, but the Synthetic Crude Oil (SCO) which takes 35% of market share (of bitumen oils) has not been well st...
Article
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Unconventional oils such as diluted bitumen from oil sands differs from most of conventional oils in terms of physiochemical properties and PAHs composition. This raises concerns regarding the effectiveness of current remediation strategies and protocols originally developed for conventional oil. Here we evaluated the efficiency of different biotre...
Article
In the context of increasing global environmental changes, it has become progressively important to understand the effects of human activity on wildlife populations. Declines in several avian populations have been observed since the 1970s, especially with respect to many farmland and grassland birds, which also include some aerial insectivores. Cha...
Preprint
Full-text available
Background Although we previously reported an association of prenatal acetaminophen exposure with more than two-fold increased odds of child ADHD, it is unknown whether prenatal acetaminophen is associated with adverse birth outcomes, and if birth outcomes may mediate the association of prenatal acetaminophen with ADHD. Methods This birth cohort fr...
Article
Full-text available
In the boreal forest, cyanobacteria can establish associations with feather moss and realize the biological nitrogen fixation (BNF) reaction, consisting in the reduction of atmospheric dinitrogen into bioavailable ammonium. In this ecosystem, moss-associated cyanobacteria are the main contributors to BNF by contributing up to 50% of new N input. Cu...
Article
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Purpose Mining activities have negative effects on soil characteristics and can result in low pH, high heavy metal content, and limited levels of essential nutrients. A tailings storage area located in northwestern Québec showed natural colonization by plants from the adjacent natural environment. The objective of the study was to determine the mai...
Article
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Plant-microbe associations are increasingly recognized as an inextricable part of plant biology and biogeochemistry. Microbes play an essential role in the survival and development of plants, allowing them to thrive in diverse environments. The composition of the rhizosphere soil microbial communities is largely influenced by edaphic conditions and...
Article
Importance: Despite evidence of an association between prenatal acetaminophen exposure and attention-deficit/hyperactivity disorder (ADHD) in offspring, the drug is not contraindicated during pregnancy, possibly because prior studies have relied on maternal self-report, failed to quantify acetaminophen dose, and lacked mechanistic insight. Object...
Article
Soils systems provide essential ecosystem functions and services performed by a hyperdiverse array of fauna, but how soil communities respond to climate change remains an understudied topic. Although previous long-term studies have found variable effects of climate change manipulations on soil communities, precipitation often yields strong response...
Article
Recent pieces of evidence suggest that Fe bound to the biofilm could assume at least two important functions, a local source of Fe for uptake and a support to extracellular metabolism, such as extracellular electron transfer. Our results show that B. subtilis can use biofilm-bound Fe for uptake only if it does not compromise Fe homeostasis of the b...
Article
Full-text available
Background: Parabens, which are used as a preservative in foods and personal care products, are detected in nearly 100% of human urine samples. Exposure to parabens is associated with DNA damage, male infertility, and endocrine disruption in adults, but the effects of prenatal exposure are unclear. In part, this is due to inadequate assessment of...
Article
Alzheimer’s disease (AD) is the most prevalent dementia in the world. Its cause(s) are presently largely unknown. The most common explanation for AD, now, is the amyloid cascade hypothesis, which states that the cause of AD is senile plaque formation by the amyloid β peptide, and the formation of neurofibrillary tangles by hyperphosphorylated tau....
Article
Full-text available
Stigomena is a genus of cyanobacteria that is often the photobiont associated with the lichen genus Stereocaulon. To elucidate the evolutionary relationships between Stereocaulon and Stigonema and assess whether there is specificity or selectivity at the ecosystem or species levels, we performed phylogenetic analyses on specimens collected througho...
Article
Full-text available
Biological nitrogen fixation (BNF), a key reaction of the nitrogen cycle, is catalyzed by the enzyme nitrogenase. The best studied isoform of this metalloenzyme requires molybdenum (Mo) at its active center to reduce atmospheric dinitrogen (N2) into bioavailable ammonium. The Mo-dependent nitrogenase is found in all diazotrophs and is the only nitr...
Article
Mining activities have significant environmental impacts, such as the production of acid mine drainage and the typical absence of vegetation on mine tailings whose absence can facilitate the migration of metals to adjacent ecosystems. We investigated the metal and metalloid composition of plants and substrates on, and near a former gold mine site t...
Article
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Warming can alter the biogeochemistry and ecology of soils. These alterations can be particularly large in high northern latitude ecosystems, which are experiencing the most intense warming globally. In this meta‐analysis, we investigated global trends in how experimental warming is altering the biogeochemistry of the most common limiting nutrient...
Article
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Biological nitrogen fixation (BNF) by microorganisms associated with cryptogamic covers, such as cyanolichens and bryophytes, is a primary source of fixed nitrogen in pristine, high-latitude ecosystems. On land, low molybdenum (Mo) availability has been shown to limit BNF by the most common form of nitrogenase (Nase), which requires Mo in its activ...
Poster
Full-text available
The boreal forest represents ~50% of the world forest, and 30% is in Canada. It contributes to the storage of 0.5 Peta grams of C per year (1015 g/an). Primary production in boreal forests is strongly limited by nitrogen bioavailability. Although boreal soils are rich in organic nitrogen, its bioavailability is low due to slow decomposition at thes...
Article
Bryophytes harbor microbiomes, including diverse communities of fungi. The molecular mechanisms by which perennial mosses interact with these fungal partners along their senescence gradients are unknown, yet this is an ideal system to study variation in gene expression associated with trophic state transitions. We investigated differentially expres...
Article
Frankia spp. are widespread nitrogen-fixing soil bacteria, which often live in symbiosis with a broad spectrum of hosts. Metal homeostasis plays a crucial role in the success of the symbiosis regarding the acquisition of essential trace metals and detoxification of potentially toxic elements. We have hypothesised that Frankia releases many organic...
Article
Evaluating in utero exposure to inorganic and multiclass organic contaminants is critical to better evaluate potential harmful effects on prenatal and postnatal development. The analysis of meconium, the first bowel discharge of the newborn, has been proposed as a non-invasive way to assess cumulative prenatal exposure. The aim of this study was to...
Article
Full-text available
Iron acquisition is of fundamental importance for microorganisms, since this metal is generally poorly bioavailable under natural conditions. In the environment, most bacteria are found tightly packed within multicellular communities named biofilms. Here, using the soil Gram-positive bacterium Bacillus subtilis , we show that biofilm formation and...
Article
Full-text available
Acetaminophen is the only over-the-counter pain reliever that is not contraindicated during pregnancy, but recent studies have questioned whether acetaminophen is safe for the fetus, particularly the developing brain. This prospective birth cohort study probed the previously observed association between in utero exposure to acetaminophen and neurod...
Article
Biological nitrogen fixation (BNF) by moss-associated cyanobacteria may represent up to 30% of the total nitrogen (N) input in unfertilized boreal forests. It remains difficult, however, to obtain reliable estimates of BNF at the landscape scale due to high spatial variability of BNF at lower scales where it is usually measured. Here we identify mo...
Article
A study was undertaken to test the effects of molybdenum (Mo) and phosphorus (P) amendments on biological nitrogen (N) fixation (BNF) by boreal forest moss-associated cyanobacteria. Feather moss (Pleurozium schreberi) samples were collected on five sites, on two dates and at different roadside distances (0-100m) corresponding to an assumed gradient...
Article
Municipal biosolids are increasingly used as a low‐cost fertilizer in agricultural soil. Biosolids are contaminated by low concentrations (ng g−1 dw range) of a large variety of organic contaminants, such as triclosan (TCS). The effect of exposure to low concentrations of organic contaminants on soil biota remains largely undocumented. We evaluated...
Article
In this study, we evaluated the bioaccumulation of neonicotinoid insecticides in the earthworm Eisenia andrei exposed to environmental concentrations (<200 ng g(-1) dry weight, nominal concentration) in an artificial soil. We tested the selectivity for neonicotinoids by exposing earthworms to 7 neonicotinoids alone and in more complex mixtures of 5...
Article
The use of white rot fungi (WRF) for bioremediation of recalcitrant trace organic contaminants (TrOCs) is becoming greatly popular. Biosorption and lignin modifying enzymes (LMEs) are the most often reported mechanisms of action. Intracellular enzymes, such as cytochrome P450 (CYP450), have also been suggested to contribute. However, direct evidenc...
Article
Biological nitrogen fixation (BNF) performed by moss-associated cyanobacteria is one of the main sources of new nitrogen (N) input in pristine, high-latitude ecosystems. Yet, the nutrients that limit BNF remain elusive. Here, we tested whether this important ecosystem function is limited by the availability of molybdenum (Mo), phosphorus (P), or bo...
Article
Cryptogamic species and their associated cyanobacteria have attracted the attention of biogeochemists because of their critical roles in the nitrogen cycle through symbiotic and asymbiotic biological fixation of nitrogen (BNF). BNF is mediated by the nitrogenase enzyme, which, in its most common form, requires molybdenum at its active site. Molybde...
Article
Molybdenum (Mo) and phosphorus (P) limitation and co-limitation of asymbiotic dinitrogen (N2) fixation has been reported in many ecosystems, from tropical to boreal. However, the mechanisms leading to these limitations remain elusive. In cold temperate forests Mo and P limitation of asymbiotic N2 fixation has been observed in gymnosperm litter but...
Article
Full-text available
Biological nitrogen fixation, the main natural input of fixed nitrogen into the biosphere, is catalyzed by Mo-, V-, or Fe-only nitrogenase metalloenzymes. Although “alternative” V- and Fe-only nitrogenase genes are found in many environments, the contribution of these isoenzymes to N2 fixation is unknown. Here we present a new method (ISARA, isotop...
Article
Biological nitrogen fixation can be catalyzed by three isozymes of nitrogenase: Mo-nitrogenase, V-nitrogenase and Fe-nitrogenase. The activity of these isozymes strongly depends on their metal cofactors, Mo, V and Fe, and their bioavailability in ecosystems. Here, we show how metal bioavailability can be affected by the presence of tannic acid (org...
Article
The effects of phyto-pharmaceutic compounds (PPCs), such as neonicotinoids, on wildlife reproduction and survival are a rising concern. Yet, understanding the biological consequences of PPC use is particularly complex given the large diversity of PPCs and their derivatives to which wildlife can be exposed. Here, we present a simple and sensitive me...
Article
Alders have already demonstrated their potential for the revegetation of both mining and industrial sites. These actinorhizal trees and shrubs and the actinobacteria Frankia associate in a nitrogen-fixing symbiosis which could however be negatively affected by the presence of heavy metals, and accumulate them. In our hydroponic assay with black ald...
Article
The increasing atmospheric CO2 concentration could stimulate terrestrial ecosystem and create an important carbon (C) sink that could slow down climate change due to anthropogenic activities. The extent of this enhanced growth will strongly depends upon the availability of nitrogen (N) to plant. In alder, the predominant N2 fixing tree in boreal fo...
Article
Full-text available
Metal isotope coded profiling (MICP) introduces a universal discovery platform for metal chelating natural products that act as metallophores, ion buffers or sequestering agents. The identification of cation and oxoanion complexing ligands is facilitated by the identification of unique isotopic signatures created by the application of isotopically...
Article
An evaluation of the efficiency of the White-rot fungi (WRF) Trametes hirsuta to remove multi-classes pharmaceutical active compounds (17 PhACs) at low and environmentally realistic concentrations (20-500ngL(-1)) was performed. The importance of biosorption over enzymatic activity on PhACs removal was also evaluated. Results highlight the importanc...
Article
Full-text available
The hydroxamate siderophore ferricrocin was identified in Cladosporium cladosporioides growth medium by solid phase extraction and ultra high pressure liquid chromatography coupled to a time of flight mass spectrometer (UHPLC/QTOF-MS). Both desferricrocin and ferricrocin were detected in the extracellular medium assisted by high resolution mass spe...
Article
Molybdenum (Mo) nitrogenase has long been considered the predominant isoenzyme responsible for dinitrogen fixation worldwide. Recent findings have challenged the paradigm of Mo hegemony, and highlighted the role of alternative nitrogenases, such as the vanadium-nitrogenase.Here, we first characterized homeostasis of vanadium (V) along with other me...
Article
Full-text available
The relative contributions of the alternative (V- and Fe-only) and canonical (Mo-) nitrogenases to N2 fixation in natural environments are still largely unknown. Here we combine chemical and molecular approaches to examine their role in terrestrial ecosystems. Pure-culture studies show that while the R ratio (defined as R = acetylene reduction rate...
Article
Full-text available
In past decades, environmental nitrogen fixation has been attributed almost exclusively to the action of enzymes in the wellstudied molybdenum-dependent nitrogen fixation system. However, recent evidence has shown that nitrogen fixation by alternative pathways may be more frequent than previously suspected. In this study, the nitrogen fixation syst...
Article
Removal of pharmaceuticals (PhCs) by photocatalysis is a promising avenue in water treatment. The efficiency of these treatments on PhC derivatives compared to their parent molecules remains poorly documented. The present study investigates the efficiency of photodegradation catalyzed by TiO2 and ZnO nanoparticles on the removal of carbamazepine (C...
Article
The limitation of asymbiotic dinitrogen (N-2) fixation by phosphorus (P) is well-documented. Studies on Mo limitation of asymbiotic N-2 fixation are, however, scarce. To what extent Mo limits asymbiotic N-2 fixation on the global scale is still unclear and the mechanisms controlling the emergence of Mo limitation remain elusive. The aim of this wor...
Article
Metallophores are a unique class of organic ligands released, for example, by nitrogen fixing bacteria in their environment in order to recruit the micronutrients molybdenum (Mo) and iron (Fe). Mo and Fe are essential cofactors of nitrogenase that reduces atmospheric nitrogen into bioavailable ammonium. Upon release, these bacterial metallophores b...
Article
Micro- and macro-nutrient acquisition by plants and microorganisms is a cornerstone for their survival and has a direct impact on biogeochemical cycling. In this study, we investigated, in controlled conditions, how the availability of exogenous nitrate impacted nutrient acquisition and distribution in black alder (Alnus glutinosa (L.) Gaertn.) in...
Article
The acquisition of essential metals, such as the metal cofactors (molybdenum (Mo) and iron (Fe)) of the nitrogenase, the enzyme responsible for the reduction of dinitrogen (N2) to ammonium, is critical to N2 fixing bacteria in soil. The release of metal nanoparticles (MNPs) to the environment could be detrimental to N2 fixing bacteria by introducin...
Article
Laccase (EC 1.10.3.2) and tyrosinases (EC 1.14.18.1) are ubiquitous enzymes present in nature as they are known to originate from bacteria, fungi, plants, etc. Both laccase and tyrosinase are copper-containing phenoloxidases requiring readily available O2 without auxiliary cofactor for their catalytic transformation of numerous phenolic substrates....
Article
N(2) fixation by moss-associated cyanobacteria plays an important role in the nitrogen cycling of terrestrial ecosystems. Recent studies have mainly focused on boreal ecosystems; little is known about such association in other ecosystems. Moss-associated cyanobacteria are subject to rapid changes (hourly or less) in environmental conditions that ma...