A5074261220- Geology and Paleoclimatology Research
- Soil Carbon and Nitrogen Dynamics
- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Pharmaceutical and Antibiotic Environmental Impacts
- Hydrocarbon exploration and reservoir analysis
- Clay minerals and soil interactions
- Metabolomics and Mass Spectrometry Studies
- Coastal wetland ecosystem dynamics
- Peatlands and Wetlands Ecology
- Adsorption and biosorption for pollutant removal
- Soil and Unsaturated Flow
- Thermochemical Biomass Conversion Processes
- NMR spectroscopy and applications
- Microbial bioremediation and biosurfactants
- Oceanographic and Atmospheric Processes
- Groundwater and Isotope Geochemistry
- Analytical chemistry methods development
- Aquatic Invertebrate Ecology and Behavior
- Marine and environmental studies
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
Dublin City University
2016-2025
22q11 Ireland
2015
University of Toronto
2006-2009
Mississippi State University
2003-2009
St. James's Hospital
1990-2008
Campden BRI (Hungary)
2008
The Scarborough Hospital
2006
University of Limerick
2001-2004
Radboud University Nijmegen
1999
Soil microbes are central to many soil processes, but due the structural complexity of organic matter, accurate quantification microbial biomass contributions continues pose a significant analytical challenge. In this study, from range soils were cultured such that their molecular profile could be compared matter and native vegetation. With use modern NMR spectroscopy, species can discerned in quantified. On basis these studies, appear much higher than 1–5% reported by other researchers....
Humic substances (HS) are an operationally defined fraction of soil organic matter, and they represent the largest pool recalcitrant carbon in terrestrial environment. It has traditionally been thought that extractable HS consist novel categories cross-linked macromolecular structures. In this study, advanced nuclear magnetic resonance approaches were used to study major components (proteins, carbohydrates, aliphatic biopolymers, lignin) known be present HS, identify their fingerprints humic...
A simplified microbiological assay for vitamin B12 estimation, completed on microtitre plates using a colistin sulphate resistant strain of Lactobacillus leichmannii (NCIB 12519), and cryopreserved cultures is described. The new correlated well with more conventional "tube" was not influenced by the presence antibiotics in serum. Evaluation performance showed excellent interassay intra-assay precision quantitative recovery added cyanocobalamin over wide range additions (94.9%-102.1%)....
Since the isolation of soil organic matter in 1786, tens thousands publications have searched for its structure. Nuclear magnetic resonance (NMR) spectroscopy has played a critical role defining but traditional approaches remove key information such as distribution components at soil-water interface and conformational information. Here novel form NMR with capabilities to study all physical phases termed Comprehensive Multiphase NMR, is applied analyze natural swollen-state. The structural...
Tidal marshes store large amounts of organic carbon in their soils. Field data quantifying soil (SOC) stocks provide an important resource for researchers, natural managers, and policy-makers working towards the protection, restoration, valuation these ecosystems. We collated a global dataset tidal marsh (MarSOC) from 99 studies that includes location, depth, site name, dry bulk density, SOC, and/or matter (SOM). The MarSOC 17,454 points 2,329 unique locations, 29 countries. generated...
A comprehensive analytical investigation of the sorption behaviour a large selection over-the-counter, prescribed pharmaceuticals and illicit drugs to agricultural soils freeze-dried digested sludges is presented. Batch experiments were carried out identify which compounds could potentially concentrate in as result biosolid enrichment. Analysis aqueous samples was directly using liquid chromatography-tandem mass spectrometry (LC-MS/MS). For solids analysis, combined pressurised extraction...
Total alkalinity (TA) is one of the four main carbonate system variables and a conventionally measured parameter used to characterise marine water chemistry. It an important indicator waterbody's buffering capacity measure its ability resist acidification, matter growing concern in environment. Although TA primarily associated with inorganic components seawater such as bicarbonate, there consensus that dissolved organic (DOM) can significantly contribute coastal waters. This fraction...
The Ponto-Caspian amphipod, Dikerogammarus villosus is a recent and successful invader of the River Rhine. It has dispersed over large distances in short time. As it an extensive invasion history Europe, thought to have potential reach invade Great Lakes America. However, for this must survive stress high salinity during ballast water exchange. Therefore, several aspects general ecophysiology D. were studied by means laboratory experiments. Highest oxygen consumption occurred around 20 °C....
<title>Abstract</title> Tidal wetlands are hotspots of soil accumulation due to high sedimentation rates and low oxygen concentrations that inhibit organic matter decomposition1. Accordingly, tidal can sequester “blue carbon” at much higher than other ecosystems2,3 helping offset human emissions. Organic carbon burial is tightly linked the cycling nitrogen, which a key pollutant limiting nutrient for many ecosystems4–6. Yet, current global rate nitrogen” how it may respond future change...
Abstract. Continental shelves are critical for the global carbon cycle, storing substantial amounts of organic (OC) over geological timescales. Shelf sediments can also be subject to considerable anthropogenic pressures, offshore construction and bottom trawling example, potentially releasing OC that has been sequestered into sediments. As a result, these have attracted attention from policy makers regarding how their management leveraged meet national emissions reductions targets. Spatial...
Healthy soils are essential in achieving climate neutrality, reversing biodiversity loss, providing nutritious food, and safeguarding human health. Despite decades of soil research, remains a highly threatened non-renewable resource, with an estimated 62% EU already degraded. This is attributed to the complexity as material ecosystem, diversity types land uses large extent, global focus on agricultural resource rather than part environmental protection. The EPA funded project Microbial...
Bottom trawling is a widespread fishing practice that has consistently been established to result in harmful, enduring effects including physical modification of the seafloor, and impacts on biogeochemical cycling as well benthic ecosystems. The mechanisms equipment used, such trawl doors, penetrate seafloor disturb sediment structure, resuspending particulate matter altering seafloor's organic composition morphology.&#160;Previous studies have assessed carbon storage marine sediments,...
Non-living natural organic matter (NOM) is ubiquitous in the oceans, atmosphere, sediments, and soils, represents most abundant carbon reserves on earth. However, a large proportion considered to be "molecularly uncharacterized" because inherent complexity of NOM problematic when applying conventional analytical techniques. This manuscript presents initial applications LC-NMR (1H) LC-SPE-NMR studies isolated from water soil. applied dissolved (DNOM) collected freshwater environments, both...
Abstract In this simplified microbiological assay for serum vitamin B12, Lactobacillus leichmanii (NCIB 8117) adapted to tolerate high concentrations (500 mg/L) of the polymyxin antibiotic colistin sulfate is used. Results were similar in parallel experiments which we used both parent strain L. 8117), and new strain. Evaluation performance showed excellent analytical recovery added cyanocobalamin (97%, SD 3%) good interassay intra-assay precision (CV less than 5%). This modified system...
The substantial heterogeneity of dissolved organic matter (DOM) inhibits detailed chromatographic analysis with conventional detectors as little structural information can be obtained in the presence extensive coelution. Here we examine direct hyphenation high-performance size exclusion chromatography (HPSEC) nuclear magnetic resonance (NMR) spectroscopy to determine how size-distinguished fractions differ composition. results support applicability using HPSEC generate more homogeneous DOM...