A5010060702- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Microbial Fuel Cells and Bioremediation
- Digital Holography and Microscopy
- Cell Image Analysis Techniques
- Bacterial biofilms and quorum sensing
- Protist diversity and phylogeny
- Marine Ecology and Invasive Species
- Marine Biology and Environmental Chemistry
- Microplastics and Plastic Pollution
- Image Processing Techniques and Applications
- Geology and Paleoclimatology Research
- Environmental DNA in Biodiversity Studies
- Coastal wetland ecosystem dynamics
- Coastal and Marine Management
- Aquatic Invertebrate Ecology and Behavior
- Geochemistry and Elemental Analysis
- Methane Hydrates and Related Phenomena
- Marine and coastal plant biology
- Microfluidic and Bio-sensing Technologies
- Metal Extraction and Bioleaching
- biodegradable polymer synthesis and properties
- Ocean Acidification Effects and Responses
- Fern and Epiphyte Biology
- Genomics and Phylogenetic Studies
Vrije Universiteit Brussel
2012-2020
University of Gothenburg
2016-2020
Royal Netherlands Institute for Sea Research
2014-2020
Utrecht University
2017-2019
Aberdeenshire Council
2011-2012
University of Aberdeen
2011-2012
James Hutton Institute
2012
Abstract Recently, a novel mode of sulphur oxidation was described in marine sediments, which sulphide deeper anoxic layers electrically coupled to oxygen reduction at the sediment surface. Subsequent experimental evidence identified that long filamentous bacteria belonging family Desulfobulbaceae likely mediated electron transport across centimetre-scale distances. Such long-range transfer challenges some long-held views microbial ecology and could have profound implications for cycling...
Abstract. Recently, long filamentous bacteria have been reported conducting electrons over centimetre distances in marine sediments. These so-called cable perform an electrogenic form of sulfur oxidation, whereby long-distance electron transport links sulfide oxidation deeper sediment horizons to oxygen reduction the upper millimetres sediment. Electrogenic exerts a strong impact on local biogeochemistry, but it is currently unknown how prevalent process within seafloor. Here we provide...
The rapid and efficient analysis of plankton samples (e.g. enumeration, identification, biomass determination) has been an important driver for recent technological developments in (semi-) automated imaging instruments. Most focus on identification abundance estimates, while less attention given to viability, i.e. the assessment whether organisms are dead or alive. However, a wide spectrum scientific applications requires accurate viability determinations, e.g. monitoring invasive species...
Cable bacteria are long, multicellular micro-organisms that capable of transporting electrons from cell to along the longitudinal axis their centimeter-long filaments. The conductive structures mediate this long-distance electron transport thought be located in envelope. Therefore, study examines detail architecture envelope cable bacterium filaments through a combination classical microscopy, cryo-based microscopy and tomography, focused ion beam-scanning atomic force microscopy. We...
Lophelia pertusa is the dominant reef-building organism of cold-water coral reefs, and known to produce significant amounts mucus, which could involve an important metabolic cost. Mucus involved in particle removal feeding processes, yet triggers dynamics mucus production are currently still poorly described because existing tools study these processes not appropriate. Using a novel microscopic technique—digital holographic microscopy (DHM)–we studied release L. under various experimental...
Abstract Diatom aggregates constitute a significant fraction of the particle flux from euphotic zone into mesopelagic ocean as part ocean's biological carbon pump. Modeling studies their exchange processes with surrounding water usually assume spherical shape and that are impermeable to flow. Using image velocimetry, we examined flow distributions around individual various irregular shapes formed two different diatom species: (1) Skeletonema marinoi , known for its cell–cell stickiness, (2)...
Traditional taxonomic identification of planktonic organisms is based on light microscopy, which both time‐ consuming and tedious. In response, novel ways automated (machine) identification, such as flow cytometry, have been investigated over the last two decades. To improve resolution particle analysis, recent developments focused “imaging‐ in‐ flow,” i.e., ability to acquire microscopic images cells in a flow‐ through mode. Imaging‐ systems are traditionally classical brightfield...
Summary Almost a century ago Redfield discovered relatively constant ratio between carbon, nitrogen and phosphorus in particulate organic matter of dissolved nutrients seawater. Since then, the riverine export to ocean has increased 20 fold. High abundance resting stages sediment layers dated more than back indicate that common planktonic diatom Skeletonema marinoi endured this eutrophication. We germinated unique genotypes from originating isotope‐dated (15 80 years old) eutrophied fjord....
Abstract. Cable bacteria are multicellular, filamentous microorganisms that capable of transporting electrons over centimeter-scale distances. Although recently discovered, these appear to be widely present in the seafloor, and when active they exert a strong imprint on local geochemistry. In particular, their electrogenic metabolism induces unusually pH excursions aquatic sediments, which considerable mineral dissolution, subsequent reprecipitation. However, at present, it is unknown...
Particles of all origins (biogenic, lithogenic, as well anthropogenic) are fundamental components the coastal ocean and re-distributed by a wide variety transport processes at both horizontal vertical scales. Suspended particles can act vehicles, carbon nutrient sources, for microorganisms zooplankton before eventually settling onto seafloor where they also provide food to benthic organisms. Different particle aggregation processes, driven turbulence stickiness, composition, abundance size,...
Recent advances in optical components, computational hardware and image analysis algorithms have led to the development of a powerful new imaging tool, digital holographic microscopy (DHM). So far, DHM has been predominantly applied life sciences medical research, here, we evaluate potential within marine context, i.e. for studying morphology, physiology ecology diatoms. Like classical light microscopy, captures light-intensity information from objects, but addition, it also records...
The ability to quantify vital aquatic organisms in the 2–50 µm size range was compared between five different flow cytometers and several microscopes. Counts of calibration beads, algal monocultures sizes as well a Wadden Sea sample were compared. Flow microscopes delivered bead concentrations. These differences instruments became larger for even higher sample. It observed that concentration significant cytometer microscope counts, this difference increased with objects counted. Microscope...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 441:49-63 (2011) - DOI: https://doi.org/10.3354/meps09390 Temporal variation in sediment permeability of an intertidal sandflat E. Zetsche1,2,4,*, D. M. Paterson3, G. Lumsdon2, U. Witte1 1Oceanlab, University Aberdeen, Newburgh AB41 6AA, UK 2The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen...
Abstract. Recently, long filamentous bacteria have been reported to conduct electrons over centimetre distances in marine sediments. These so-called cable perform a novel "electrogenic" form of sulfur oxidation, whereby long-distance electron transport links sulfide oxidation deeper sediment horizons oxygen reduction the upper millimetres sediment. Electrogenic exerts strong impact on biogeochemistry, but it is currently unknown how prevalent process within seafloor. Here we provide...
Abstract. Cable bacteria are multicellular, filamentous microorganisms that capable of transporting electrons over centimeter-scale distances. Although recently discovered, these appear to be widely present in the seafloor, and when active, they exert a strong imprint on local geochemistry. In particular, their electrogenic metabolism induces unusually pH excursions aquatic sediments, which considerable mineral dissolution, subsequent re-precipitation. However at present, it is unknown...