A5015749141- Toxic Organic Pollutants Impact
- Environmental Toxicology and Ecotoxicology
- Oil Spill Detection and Mitigation
- Microbial bioremediation and biosurfactants
- Pesticide and Herbicide Environmental Studies
- Environmental Chemistry and Analysis
- Atmospheric and Environmental Gas Dynamics
- Petroleum Processing and Analysis
- Hydrocarbon exploration and reservoir analysis
- Coral and Marine Ecosystems Studies
- Effects and risks of endocrine disrupting chemicals
- Marine Biology and Ecology Research
- Enhanced Oil Recovery Techniques
- Metabolomics and Mass Spectrometry Studies
- Marine and coastal plant biology
- Zebrafish Biomedical Research Applications
- Psychiatric care and mental health services
- Species Distribution and Climate Change
- Healthcare Decision-Making and Restraints
- Identification and Quantification in Food
- Pain Management and Treatment
- Plant Surface Properties and Treatments
- Per- and polyfluoroalkyl substances research
- Environmental DNA in Biodiversity Studies
- Pharmaceutical and Antibiotic Environmental Impacts
ExxonMobil (United States)
2013-2024
University of Mississippi Medical Center
2024
ExxonMobil (Qatar)
2019-2021
Qatar Science and Technology Park
2019-2021
The University of Sydney
2019
Monash University
2019
Flinders University
2019
St Vincent's Hospital Sydney
2019
UNSW Sydney
2019
BPP University
2014
Various groups have studied the rate of oil biodegradation in sea over many years, but with no consensus on results. This can be attributed to factors, we show here that principal confounding influence is concentration used different experiments. Because dilution, measured concentrations dispersed are sub-parts-per-million within a day dispersal, and at such detectable hydrocarbons has an apparent half-life 7-14 days. contrasted degradation higher found slicks or when stranded shoreline;...
Dispersants are important tools in oil spill response. Taking advantage of the energy even small waves, they disperse floating slicks into tiny droplets (<70 μm) that entrain water column and drift apart so do not re-agglomerate to re-form a slick. The dramatically increased surface area allows microbial access much more oil, diffusion dilution lead concentrations where natural background levels biologically available oxygen, nitrogen, phosphorus sufficient for growth consumption. only used...
Abstract The PETROTOX model was developed to perform aquatic hazard assessment of petroleum substances based on substance composition. relies the hydrocarbon block method, which is widely used for conducting risk assessments providing further justification evaluating performance. Previous work described this and provided a preliminary calibration validation using acute toxicity data limited substance. objective present study re‐evaluate expanded covering both chronic endpoints invertebrates,...
Because of the large number possible aromatic hydrocarbon structures, predictive toxicity models are needed to support substance hazard and risk assessments. Calibration evaluation such requires data with well-defined exposures. The present study has applied a passive dosing method generate reliable chronic effects for 8 polycyclic hydrocarbons (PAHs) on green algae Pseudokirchneriella subcapitata crustacean Ceriodaphnia dubia. observed these substances algal growth rate neonate production...
Oil sand operations in Alberta, Canada will eventually include returning treated process-affected waters to the environment. Organic constituents oil water (OSPW) represent complex mixtures of nonionic and ionic (e.g., naphthenic acids) compounds, compositions can vary spatially temporally, which has impeded development quality benchmarks. To address this challenge, it was hypothesized that solid phase microextraction fibers coated with polydimethylsiloxane (PDMS) could be used as a...
Abstract Characterization of the aquatic toxicity oil is needed to support hazard assessment and inform spill response. Natural processes mitigation strategies involving dispersant use can result in exposures both dissolved droplet that are not typically differentiated when characterized tests. Thus, impact droplets on largely uncharacterized. To improve understanding role droplets, acute tests with Daphnia magna Americamysis bahia were performed Endicott crude low‐energy mixing systems...
Aromatic hydrocarbons (AH) are known to impair fish early life stages (ELS). However, poorly defined exposures often confound ELS-test interpretation. Passive dosing (PD) overcomes these challenges by delivering consistent, controlled exposures. The objectives of this study were apply PD obtain 5 d acute embryo lethality and developmental data 30 chronic embryo-larval survival growth-effects using zebrafish with different AHs; analyze literature toxicity target-lipid (TLM) chemical-activity...
A comprehensive, high resolution, ground truthed benthic habitat map has been completed for Qatar's coastal zone and Halul Island. The objectives of this research were to; 1. Systematically compare contrast pixel- object-based classifiers mapping in a limited focus area then to, 2. Apply these learnings to develop an accurate resolution the entirety Qatari zone. Results indicate methods proved more efficient when compared pixel based classifiers. developed country-wide covers 4500 km2...
The Khor Al Adaid embayment of southern Qatar represents a unique shallow-water mixed siliciclastic‑carbonate coastal depositional system that developed in hyper-arid climatic setting over the past 6000 years. embayment, which was formed during Flandrian transgression as result flooding across partially fault-controlled incised fluvial drainage, is supplied by quartz-rich sands delivered wind-blown dunes migrating southward surface Qatar. These offshore-migrating eolian-derived sediments are...
Oil spill exposures are highly dynamic and not comparable to laboratory used in standard toxicity tests. Toxicokinetic-toxicodynamic (TKTD) models allow translation of effects observed the field. To improve TKTD model calibration, new previously published data from 148 tests were analyzed estimate rates characterizing time course for 10 fish 42 invertebrate species across 37 hydrocarbons. A key parameter is first-order rate that incorporates passive elimination, biotransformation, damage...
Abstract The Organisation for Economic Co-operation and Development (OECD) test guideline 236 (fish embryo acute toxicity test; 2013) relies on 4 endpoints to describe exposure-related effects (coagulation, lack of somite formation, tail-bud detachment from the yolk sac, presence a heartbeat). Danio rerio (zebrafish) embryos were used investigate these along with number additional sublethal (cardiac dysfunction, pericardial edema, sac tail curvature, hatch success, edema area, craniofacial...
Background and Purpose- The aim of this trial was to determine the effect additional upper limb rehabilitation following botulinum toxin-A for activity in chronic stroke. Methods- We conducted a multicenter phase III randomized with concealed allocation, blinded measurement, intention-to-treat analysis. One hundred forty stroke survivors who were scheduled receive any muscle(s) that cross wrist because moderate severe spasticity after >3 months ago, had completed formal no significant...
Reliable delineation of aquatic toxicity cut-offs for poorly soluble hydrocarbons is lacking. In this study, vapor and passive dosing methods were applied in limit tests with algae daphnids to evaluate the presence or absence chronic effects at exposures corresponding water solubility representative from five structural classes: branched alkanes, mono, di, polynaphthenic (cyclic) alkanes monoaromatic naphthenic (MANHs). Algal growth rate daphnid immobilization, reproduction served as...
Fish embryos are excellent models for studies aimed at understanding toxic mechanisms and indications of possible acute chronic effects. For the past 3 yr, an Arabian killifish (Aphanius dispar) fish embryo test has been developed in authors' laboratory as a routine ecotoxicological that can be used to support risk assessment potential contaminants Gulf coastal waters. Tests were conducted with reference toxicants (3,4-dichloroaniline [DCA], sodium dodecyl sulfate, zinc sulfate [Zn])...
Characterizing benthic habitat sensitivities of rapidly-developing countries is paramount importance. Recent efforts defining the Qatar's coastal zone with a high-resolution, ground-truthed map has provided framework on which to develop sensitivity map. Here we present analysis catered towards identifying habitats varying natural and anthropogenic stressors quantitative scale from 1 5, low high. We have identified that majority area risk (i.e. sandflats). However, there are six areas...
The standard of care for prolactinomas is pharmaceutical therapy with dopamine receptor agonists such as cabergoline. Long term pharmacotherapy typically required. This can create a challenge in the setting schizophrenia where antagonism care. To explore this challenge, we describe case patient found to have giant prolactinoma cabergoline resistance.
ABSTRACT Monitoring wildlife populations in proximity to industrial activities, including oil and gas operations, is critical mitigating potential risk both animals workers, especially at night. We report on tests of mobile power‐tethered unmanned aerial systems (UASs) equipped with thermal cameras, comparing between these as well more conventional ground‐based camera traps. Our overall objective was develop suggestions for utility UASs by industry monitor populations. focused...