A5013073888- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Methane Hydrates and Related Phenomena
- Adipose Tissue and Metabolism
- Microbial Community Ecology and Physiology
- Geochemistry and Elemental Analysis
- Heavy metals in environment
- Toxic Organic Pollutants Impact
- Analytical chemistry methods development
- Mercury impact and mitigation studies
- Peroxisome Proliferator-Activated Receptors
- Marine Bivalve and Aquaculture Studies
- Atmospheric chemistry and aerosols
- Geochemistry and Geologic Mapping
- Groundwater and Isotope Geochemistry
- Radioactive element chemistry and processing
- Pesticide and Herbicide Environmental Studies
- Lipid metabolism and biosynthesis
- Paleontology and Stratigraphy of Fossils
- Geological Studies and Exploration
- Iron oxide chemistry and applications
Concordia University
2014-2025
Institut Universitaire de Cardiologie et de Pneumologie de Québec
2016-2025
Université Laval
2005-2025
Concordia University
2015-2024
Grantmakers for Effective Organizations
2023
Université du Québec à Montréal
1995-2022
Montreal Heart Institute
2018
McGill University
2009-2011
Lawrence Livermore National Laboratory
2003
University of Regina
2003
Black carbon (BC), produced by incomplete combustion of fossil fuels and vegetation, occurs ubiquitously in soils sediments. BC exists as a continuum from partly charred material to highly graphitized soot particles, with no general agreement on clear‐cut boundaries definition or analysis. In comparative analysis, we measured forms eight soil samples six established methods. All methods involved removal the non‐BC components sample thermal chemical means combination both. The remaining...
Recent findings have confirmed the importance of black carbon (BC) in global biogeochemical cycles and oxygen through its important contribution to slowly cycling organic (OC) pool. Yet, most BC determination methods published date measure operationally defined fractions, oftentimes with a high potential for artifacts lack specificity one two major forms continuum, soot/graphitic (GBC) char/charcoal (CBC). This paper describes method that reduces accurately selectively concentration GBC...
Interactions between organic matter and mineral matrices are critical to the preservation of soil sediment matter. In addition clay minerals, Fe(III) oxides particles have recently been shown be responsible for protection burial a large fraction sedimentary carbon (OC). Through combination synchrotron X-ray techniques high-resolution images intact particles, we assessed mechanism interaction OC iron, as well composition co-localized with ferric iron. We present scanning transmission x-ray...
Abstract We examined the role of reactive iron (Fe R ) in preserving organic carbon (OC) across a subaerial chronosequence Wax Lake Delta, prograding delta within Mississippi River Delta complex. found that ~15.0% OC was bound to Fe , and dominant binding mechanisms varied from adsorption youngest region coprecipitation at older, vegetated sites. The δ 13 C iron‐associated more negative than total (mean = −2.6‰), indicating greater preference for terrestrial material and/or compounds with...
Upper airway dilator muscles play an important role in the pathophysiology of sleep apnea hypopnea syndrome (SAHS). The mechanical and structural characteristics these remain unknown. aim this study was to compare physiologic, metabolic, fiber type one upper muscle (musculus uvulae, MU) 11 SAHS seven nonapneic snorers. different analyses were done on MU obtained during uvulo-palato-pharyngoplasty. Snorers differed only their + indices (11.5 +/- 5.9 34.2 14.6/h, respectively, mean SD)....
In this study, we aimed to establish the mechanisms whereby peroxisome proliferator–activated receptor γ (PPARγ) agonism brings about redistribution of fat toward subcutaneous depots and away from visceral fat. rats treated with full PPARγ agonist COOH (30 mg · kg−1 day−1) for 3 weeks, mass was doubled that reduced by 30% relative untreated rats. Uptake triglyceride-derived nonesterified fatty acids greatly increased in (14-fold) less so (4-fold), a concomitant increase, restricted only,...
Hydraulic fracturing is becoming an important technique worldwide to recover hydrocarbons from unconventional sources such as shale gas. In Quebec (Canada), the Utica Shale has been identified having gas production potential. However, there a moratorium on exploration since 2010. The work reported here was aimed at defining baseline concentrations of methane in shallow aquifers St. Lawrence Lowlands and its using δ13C signatures. Since this study performed prior large-scale activities, it...
Abstract In response to cold, brown adipose tissue (BAT) increases its metabolic rate and expands mass produce heat required for survival, a process known as BAT recruitment. The mechanistic target of rapamycin complex 1 (mTORC1) controls metabolism, cell growth proliferation, but role in regulating recruitment chronic cold stimulation is unknown. Here, we show that activates mTORC1 BAT, an effect depends on the sympathetic nervous system. Adipocyte-specific loss mice completely blocks...
The microbial carbon pump (MCP) hypothesis suggests that successive transformation of labile dissolved organic (DOC) by prokaryotes produces refractory DOC (RDOC) and contributes to the long-term stability deep ocean reservoir. We tested MCP exposing surface water from a convective region epipelagic, mesopelagic, bathypelagic prokaryotic communities tracked changes in matter concentration, composition, taxa over time. Prokaryotic were more efficient at consuming producing RDOC as evidenced...
The transcription factor hepatocyte nuclear 4 A (HNF4A) controls the metabolic features of several endodermal epithelia. Both HNF4A and HNF4G are redundant in intestine it remains unclear whether alone intestinal lipid metabolism. Here we show that is not required for metabolism per se, but unexpectedly influences whole-body energy expenditure diet-induced obesity (DIO). Deletion caused mice to become DIO-resistant with a preference fat as an substrate energetic changes association white...
The metabolic consequences of visceral obesity have been associated with amplification glucocorticoid action by 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1) in adipose tissue. This study aimed to assess a rat model diet-induced the effects pharmacological 11beta-HSD1 inhibition on morphology and expression key genes lipid metabolism intraabdominal depots. Rats fed high-sucrose, high-fat diet were treated or not specific inhibitor (compound A, 3 mg/kg.d) for wk. Compound A did...
Fitness depends not only on resource uptake but also the allocation of these resources to various life history functions. This study explores life-history consequences larval diet in terms performance adult body composition and reproductive traits forest tent caterpillar (Malacosoma disstria Hübner). Caterpillars were reared their preferred tree host, trembling aspen (Populus tremuloides), or one three artificial foods: high protein:low carbohydrate, equal protein-to-carbohydrate ratio low...
In the Guaymas Basin, presence of cold seeps and hydrothermal vents in close proximity, similar sedimentary settings comparable depths offers a unique opportunity to assess compare functioning these deep-sea chemosynthetic ecosystems. The food webs five seep four vent assemblages were studied using stable carbon nitrogen isotope analyses. Although two ecosystems shared potential basal sources, their differed: relied predominantly on methanotrophy thiotrophy via Calvin-Benson-Bassham (CBB)...
Nonalcoholic fatty liver disease (NAFLD) prevails in obesity and is linked to several health complications including dyslipidemia atherosclerosis. How exactly NAFLD induces atherogenic promote cardiovascular diseases still elusive. Here, we identify Tsukushi (TSK) as a hepatokine induced response NAFLD. We show that both endoplasmic reticulum stress inflammation the expression release of TSK mice. In humans, hepatic also associated with steatosis, its circulating levels are markedly...
Known as the smell of earth after rain, geosmin is an odorous terpene detectable by humans at picomolar concentrations. Geosmin production heavily conserved in actinobacteria, myxobacteria, cyanobacteria, and some fungi, but its biological activity poorly understood. We theorized that was aposematic signal used to indicate unpalatability toxin-producing microbes, discouraging predation eukaryotes. Consistent with this hypothesis, we found altered behavior bacteriophagous nematode...