A5030411046- Aquatic Ecosystems and Phytoplankton Dynamics
- Calcium Carbonate Crystallization and Inhibition
- Paleontology and Stratigraphy of Fossils
- Soil and Water Nutrient Dynamics
- Geology and Paleoclimatology Research
- Aquatic Invertebrate Ecology and Behavior
- Hydrocarbon exploration and reservoir analysis
- Microbial Community Ecology and Physiology
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Marine and environmental studies
- Microbial Applications in Construction Materials
- Geochemistry and Elemental Analysis
- Minerals Flotation and Separation Techniques
- Marine Sponges and Natural Products
- Building materials and conservation
- Biocrusts and Microbial Ecology
- Phosphorus and nutrient management
- Radioactive element chemistry and processing
- Iron oxide chemistry and applications
- Diatoms and Algae Research
- Coastal wetland ecosystem dynamics
- Analytical chemistry methods development
- Geochemistry and Geologic Mapping
- Bone Tissue Engineering Materials
The Scarborough Hospital
2016-2025
University of Toronto
2016-2025
Qatar University
2021-2025
Nanjing University
2023
Toronto Public Health
2021
University of California System
2016
Swiss Federal Institute of Aquatic Science and Technology
2002-2013
University of Chicago
2006
University of Bonn
2006
Stanford University
2006
Large lakes of the world are habitats for diverse species, including endemic taxa, and valuable resources that provide humanity with many ecosystem services. They also sentinels global local change, recent studies in limnology paleolimnology have demonstrated disturbing evidence their collective degradation terms depletion (water food), rapid warming loss ice, destruction ecosystems, accelerating pollution. particularly exposed to anthropogenic climatic stressors. The Second Warning Humanity...
Research Article| November 01, 2008 Aerobic microbial dolomite at the nanometer scale: Implications for geologic record Mónica Sánchez-Román; Sánchez-Román * 11ETH-Zürich, Geological Institute, 8092 Zürich, Switzerland *E-mail: monica.sanchez@erdw.ethz.ch Search other works by this author on: GSW Google Scholar Crisógono Vasconcelos; Vasconcelos Thomas Schmid; Schmid 22ETH-Zürich, Department of Chemistry and Applied Biosciences, 8093 Maria Dittrich; Dittrich 33EAWAG, Swiss Federal Institute...
Abstract Calcite nucleation on the surface of cyanobacteria Synechococcus leopoliensis strain PCC 7942 was investigated to assess influence photosynthetic uptake inorganic carbon and active ion exchange processes across cell membrane precipitation mechanisms. We performed long‐term experiments at a constant CO 2 level in ambient air by adding suspensions previously washed solutions NaHCO 3 /CaCl which were supersaturated with respect calcite. Induction times between 4 110 h measured over...
Despite the crucial role of polyphosphate (polyP) in aquatic environments, its metabolism cyanobacteria responding to nutrients is poorly understood. We investigate polyP three species, specifically unicellular picocyanobacteria, under various nutritional conditions. Our experiments show that accumulation strongly dynamic, depending on phosphate levels and growth stages. 'Overplus' uptake phosphorus (P) during lag phase leads rapid polyP, followed by lower quotas exponential stage as a...
The "Dolomite Problem" has been a controversy for over century, owing to massive assemblages of low-temperature dolomite in ancient rocks with little forming today despite favorable geochemical conditions. Experiments show that microbes and their exopolymeric substances (EPS) nucleate dolomite. However, factors controlling abundances can still not be explained. To decode the enigma dolomite, we examined modern environment, found cyclic shift microbial community between cyanobacteria...
A 1-year field study monitoring depth profiles of picoplankton and physicochemical data in the oligotrophic Lake Lucerne (Switzerland) showed that picocyanobacteria play an important role CaCO3 precipitation process. Laboratory experiments with Mychonastes Chlorella, isolated from Synechococcus using ion selective electrodes, scanning electron microscopy X-ray powder diffraction clearly demonstrated potential for fast effective precipitation. The combination a laboratory confirmed previous...
Abstract Cyanobacteria have been recognized as key players in the precipitation of calcium carbonate marine and freshwater systems. These bacteria increase pH, (as a result photosynthetic activity) also produce extracellular polysaccharides, which act binding sites for Ca 2+ CO 3 2− . Both processes influence morphology mineralogy minerals. In order to clarify role polysaccharides picocyanobacteria upon precipitation, both their buffering capacity ability induce need be investigated. this...
Blue carbon represents the organic retained in marine coastal ecosystems. Sabkhas (an Arabic for "mudflats"), formed tidal environments under arid conditions, have been proposed to be capable of sequestrating. Despite growing understanding critical role blue ecosystems, there is a current dispute about whether sabkhas around Persian Gulf can contribute retention as ecosystem. The arguments often lack data on contributor, inorganic form carbonates, which drive net exchange with atmosphere. In...
Abstract Coastal wetland sediments are vital to the global carbon cycle as they represent large sinks of blue – from atmospheric and oceanic sources which threatened by ecosystem loss. The forms sequestered sequestration capability affected many bio- geochemical factors that change unpredictably along coastal locales. In present study, we investigated three unique sites a mangrove two sabkhas with contrasting geology tidal influence in Qatar peninsula for their capture ability determine how...
Summary A new device (NTEGRA Tomo) that is based on the integration of scanning probe microscope (SPM) (NT‐MDT NTEGRA SPM) and Ultramicrotome (Leica UC6NT) presented. This enables direct monitoring a block face surface immediately following each sectioning cycle ultramicrotome procedure. Consequently, this can be applied for serial section tomography wide range biological polymer materials. The automation sectioning/scanning allows one to acquire up 10 consecutive sectioned layer images per...
An ecosystem perspective to restoring beneficial uses in Areas of Concern can be interpreted as a shift from the traditional elucidation simple cause-effect relationships multicausal way thinking that more effectively accommodates complexity. This holistic management paradigm has also pervaded contemporary ecological modeling practice, making compelling adoption sophisticated tools. In this study, our primary objective is develop Bayesian hierarchical network models for Lake Simcoe, Ontario,...