A5000424696- Pesticide and Herbicide Environmental Studies
- Pharmaceutical and Antibiotic Environmental Impacts
- Soil Carbon and Nitrogen Dynamics
- Soil and Water Nutrient Dynamics
- Environmental Toxicology and Ecotoxicology
- Weed Control and Herbicide Applications
- Effects and risks of endocrine disrupting chemicals
- Gender Diversity and Inequality
- Toxic Organic Pollutants Impact
- Pesticide Residue Analysis and Safety
- Soil erosion and sediment transport
- Fecal contamination and water quality
- Water Treatment and Disinfection
- Mentoring and Academic Development
- Radioactive element chemistry and processing
- Diversity and Career in Medicine
- Work-Family Balance Challenges
- Mycobacterium research and diagnosis
- Pesticide Exposure and Toxicity
- Antibiotic Resistance in Bacteria
- Bacterial Identification and Susceptibility Testing
- Environmental DNA in Biodiversity Studies
- Career Development and Diversity
- Isotope Analysis in Ecology
- Gut microbiota and health
University of Manitoba
2015-2024
Mount Saint Vincent University
2021
Pir Mehr Ali Shah Arid Agriculture University
2014
Pakistan Agricultural Research Council
2014
CSIRO Land and Water
2014
The University of Adelaide
2014
University of Toronto
1995-2000
The Scarborough Hospital
1995
The limitation of 16S rRNA gene sequencing (DNA-based) for microbial community analyses in water is the inability to differentiate live (dormant cells as well growing or non-growing metabolically active cells) and dead cells, which can lead false positive results absence microbes. Propidium-monoazide (PMA) has been used selectively remove DNA from during downstream process. In comparison, (RNA-based) target both dormant produce rRNA. objective this study was compare efficiency sensitivity...
Access to safe drinking water is now recognized as a human right by the United Nations. In developed countries like Canada, access clean generally not matter of concern. However, one in every five First Nations reserves under advisory, often due unacceptable microbiological quality. this study, we analyzed source and potable from community for presence coliform bacteria well various antibiotic resistance genes. Samples, including those sources, were found be positive genes, namely, ampC,...
J. Environ. Qual. 48(2):217–232 In Table 2 of this article, the phrases “2004 humic acid” and fulvic were inadvertently switched in far-left column. Reversing their order then provides proper data matrix. We provide corrected table here.
Agricultural policy frameworks aim to develop scientifically sound measures that can be used assess the environmental performance and risks associated with agricultural systems. As part of this assessment, pesticide leaching models are applied at large scales risk groundwater contamination across soil series, fields, watersheds, or regions. Measurements sorption by among most sensitive input parameters in models. Soil organic matter (SOM) is single important constituent influencing soils....
ABSTRACT The microbiological content of water is an ongoing concern in First Nations communities Canada. Many lack treatment plants and continue to be under drinking advisories. However, access only a part the problem as poor distribution systems also contribute failure provide safe water. Here, we studied microbial diversity antibiotic resistome from stored cisterns two Manitoba, We found that cistern contained high number bacteria showed presence diverse antimicrobial resistance genes....
Sorption of the estrogens estrone (E1), 17beta-estradiol (E2) and 17alpha-ethynylestradiol (EE2) on four soils was examined using batch equilibrium experiments with initial estrogen concentrations ranging from 10 to 1000 ng mL-1. At all concentrations, >85% three sorbed rapidly a sandy soil. E1 more strongly soil than E2 or EE2. Partial oxidation observed in presence soils. Autoclaving effective at reducing this conversion inhibition sodium azide mercuric chloride, had little effect...
Two field sites located in the northern region of North American Great Plains were examined to investigate contributions water and tillage erosion towards total soil topographically complex landscapes (hummocky undulating landscapes). Results indicated that both contributed substantially landscape while dominated hummocky landscape. The patterns water, can be predicted using segmentation such landscapes. Soil properties crop yield are also related erosion. Landscape used as a simple tool...
Glyphosate [N-(phosphonomethyl)glycine] is the active ingredient of several herbicide products first registered for use in 1974 under tradename Roundup. The glyphosate-based herbicides has increased dramatically over last two decades particularly association with adoption glyphosate-tolerant crops. been detected a range surface waters but this study to monitor its fate prairie wetlands situated agricultural fields. An ephemeral wetland (E) and semi-permanent (SP) were each divided into...
Groundwater samples were collected from piezometers and water table wells in both dryland irrigated agricultural regions of Alberta, Canada, to examine the occurrence pesticide mixtures. Fourteen current-use pesticides two historical compounds detected over a 3-yr sampling period. Pesticide mixtures ∼3% groundwater samples, frequency detection increased spring (1.5%) summer (3.8%) fall (4.8%). always consisted at least one auxin herbicides: 2,4-dichlorophenoxyacetic acid (2,4-D) or...
Abstract This study quantified 2,4-D [(2,4-dichlorophenoxy)acetic acid] sorption and mineralization rates in five soils as influenced by soil characteristics nutrient contents. Results indicated that was weakly sorbed soil, with Freundlich distribution coefficients ranging from 0.81 to 2.89 µg1−1/n g−1 mL1/ n . First-order rate constants varied 0.03 0.26, corresponding calculated half-lives of 3 22 days, respectively. Herbicide generally increased increasing organic carbon content, but the...
Abstract The sorption of 2,4‐D and glyphosate herbicides in soil was quantified for 287 surface soils (0–15 cm) collected a 10 × m grid across heavily eroded, undulating, calcareous prairie landscape. Other variables that were determined included carbonate content, pH, organic carbon content (SOC), texture, loss or gain by tillage water erosion, selected terrain attributes landform segments. coefficient (K d ) significantly associated with (−0.66; P < 0.001), pH (−0.63; SOC (0.47; 0.001)....
Tillage is a driving force of soil movement in cultivated fields. Soil constituents, together with the mass soil, are redistributed across landscapes by tillage. The pattern tillage‐induced constituent redistribution determined tillage erosion (tillage‐induced loss or gain) and dispersivity translocation. In this study, we used convoluting procedure developed Translocation Model (TillTM) to simulate translocation process demonstrate organic carbon (OC) (as an example constituents)...