A5073825473- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Wastewater Treatment and Nitrogen Removal
- Protist diversity and phylogeny
- Diatoms and Algae Research
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Marine and environmental studies
- Bacterial biofilms and quorum sensing
- Marine and coastal plant biology
- Environmental Impact and Sustainability
- Oral microbiology and periodontitis research
- Environmental DNA in Biodiversity Studies
- Ocean Acidification Effects and Responses
- Phytase and its Applications
- Nematode management and characterization studies
- Emergency and Acute Care Studies
- Analytical Chemistry and Sensors
- Marine Sponges and Natural Products
- Scientific Research and Discoveries
- Nitrogen and Sulfur Effects on Brassica
- Animal Diversity and Health Studies
- Microbial Fuel Cells and Bioremediation
- Antifungal resistance and susceptibility
Hochschule Bremen
2022-2023
Aarhus University
2015-2022
Max Planck Institute for Marine Microbiology
2006-2014
Constructor University
2013-2014
Max Planck Society
2006-2013
Leibniz University Hannover
2006-2008
Leibniz University of Applied Sciences
2005
Current sampling of genomic sequence data from eukaryotes is relatively poor, biased, and inadequate to address important questions about their biology, evolution, ecology; this Community Page describes a resource 700 transcriptomes marine microbial help understand role in the world's oceans.
Diatoms survive in dark, anoxic sediment layers for months to decades. Our investigation reveals a correlation between the dark survival potential of marine diatoms and their ability accumulate NO 3 − intracellularly. Axenic strains benthic pelagic that stored 11–274 mM cells survived 6–28 wk. After sudden shifts conditions, diatom Amphora coffeaeformis consumed 84–87% its intracellular pool within 1 d. A stable-isotope labeling experiment proved 15 consumption was accompanied by production...
In the world's oceans, even relatively low oxygen (O2) levels inhibit anaerobic nitrogen cycling by free-living microbes. Sinking organic aggregates, however, might provide oxygen-depleted microbial hotspots in otherwise oxygenated surface waters. Here we show that sinking diatom aggregates can host at ambient O2 well above hypoxic threshold. Aggregates were produced from ubiquitous Skeletonema marinoi and natural community of seawater. Microsensor profiling through center revealed internal...
Abstract Identifying and quantifying nitrogen pools is essential for understanding the cycle in aquatic ecosystems. The ubiquitous diatoms represent an overlooked nitrate pool as they can accumulate intracellularly utilize it assimilation, dissipation of excess photosynthetic energy, Dissimilatory Nitrate Reduction to Ammonium (DNRA). Here, we document global co-occurrence intracellular phototrophic microbial communities freshwater ( n = 69), coastal 44), open marine 4) habitats. Diatom...
ABSTRACT A lithotrophic freshwater Beggiatoa strain was enriched in O 2 -H S gradient tubes to investigate its ability oxidize sulfide with NO 3 − as an alternative electron acceptor. The contained different concentrations, and the chemotactic response of mats observed. effects sp. on vertical gradients , H S, pH, were determined microsensors. more that added agar, deeper filaments glided into anoxic agar layers, suggesting used at depths below depth penetrated. In presence formed thick...
Diatom-bacteria aggregates are key for the vertical transport of organic carbon in ocean. Sinking also represent pelagic microniches with intensified microbial activity, oxygen depletion center, and anaerobic nitrogen cycling. Since some aggregate-forming diatom species store nitrate intracellularly, we explored fate intracellular its availability metabolism within anoxic diatom-bacteria aggregates. The ubiquitous nitrate-storing Skeletonema marinoi was studied as both axenic cultures...
Thalassiosira weissflogii, an abundant, nitrate-storing, bloom-forming diatom in the world's oceans, can use its intracellular nitrate pool for dissimilatory reduction to ammonium (DNRA) after sudden shifts darkness and anoxia, most likely as a survival mechanism. T. weissflogii cells that stored 4 mM 15N-nitrate consumed 1.15 (±0.25) fmol NO3- cell-1 h-1 simultaneously produced 1.57 (±0.21) 15NH4+ during first 2 hours of dark/anoxic conditions. Ammonium from was excreted by cells,...
A wealth of microbial eukaryotes is adapted to life in oxygen-deficient marine environments. Evidence accumulating that some these survive anoxia by employing dissimilatory nitrate reduction, a strategy otherwise widespread prokaryotes. Here, we report on the anaerobic metabolism fungus Aspergillus terreus (isolate An-4) was obtained from sediment seasonal oxygen minimum zone Arabian Sea, globally important site oceanic nitrogen loss and nitrous oxide emission. Axenic incubations An-4...
Intracellular nitrate storage allows microorganisms to survive fluctuating nutrient availability and anoxic conditions in aquatic ecosystems. Here we show that diatoms, ubiquitous highly abundant microalgae, represent major cellular reservoirs of an intertidal flat the German Wadden Sea are potentially involved anaerobic respiration. (ICNO3) was present year-round sediment spatially temporally correlated with fucoxanthin, marker photopigment diatoms. Pyrosequencing SSU rRNA genes all domains...
Abstract The Marselisborg WWTP (Aarhus, Denmark) fed the mainstream nitrification/denitrification tanks with excess sludge from a sidestream DEMON tank for more than three years to investigate if anammox can supplement conventional in of temperate region. To evaluate this long-term attempt, and also denitrification rates were measured activated main- at 10, 20 30 °C using 15N-labelling (stable isotope) experiments. results show that contributes by approximately 1% total nitrogen removal...
Abstract. The Sylt Roads pelagic time series covers physical and hydrochemical parameters at five neighboring stations in the Sylt–Rømø bight, Wadden Sea, North Sea. Since beginning of 1973, sea surface temperature (SST), salinity, ammonium, nitrite, nitrate, soluble reactive phosphorus (SRP) have been measured twice a week. other were introduced later (dissolved silicate (Si) since 1974, pH 1979, dissolved organic nitrogen (DON) 1996, (DOP) 2001, chlorophyll suspended particulate matter...
In situ and on-board pulse-chase experiments were carried out on a sublittoral fine sand in the German Bight (southern North Sea) to investigate hypothesis that sandy sediments are highly active have fast turnover rates. To test this hypothesis, we conducted series of where investigated pathway settling particulate organic carbon through benthic food web. The diatom Ditylum brightwellii was labelled with stable isotope 13C injected into incubation chambers. On-board incubations lasted 12, 30...
The large sulfur bacteria, Beggiatoa spp., live on the oxidation of sulfide with oxygen or nitrate, but avoid high concentrations both and oxygen. As gliding filaments, they rely reversals in direction to find their preferred environment, oxygen-sulfide interface. We observed chemotactic patterns single filaments a transparent agar medium scored glided distances between reversals. Filaments within microenvironment shorter than own length that anchored them position as microbial mat. oxic...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 297:61-70 (2005) - doi:10.3354/meps297061 Processing of 13C-labelled phytoplankton in a fine-grained sandy-shelf sediment (North Sea): relative importance different macrofauna species Anja Kamp1,2,*, Ursula Witte1,3 1Max Planck Institute for Microbiology, Celsiusstr. 1, 28359 Bremen, Germany2Present address:...
A marine Beggiatoa sp. was cultured in semi-solid agar with opposing oxygen-sulfide gradients. Growth pattern, breakage of filaments for multiplication, and movement directions the transparent were investigated by time-lapse video recording. The initial doubling time cells 15.7 +/- 1.3 h (mean SD) at room temperature. Filaments grew up to an average length 1.7 0.2 mm, but approximately 6 mm also present. First breakages occurred 19 after inoculation, movies illustrated that a parent filament...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 445:181-192 (2012) - DOI: https://doi.org/10.3354/meps09464 Indirect control of intracellular nitrate pool intertidal sediment by polychaete Hediste diversicolor Ines M. Heisterkamp, Anja Kamp, Angela T. Schramm, Dirk de Beer, Peter Stief* Max Planck Institute for Microbiology, Celsiusstraße 1, 28359 Bremen,...
Intracellular nitrate is an important electron acceptor in oxygen-deficient aquatic environments, either for the nitrate-storing microbes themselves, or ambient microbial communities through leakage. This study links spatial distribution of intracellular with abundance and identity sediments Bornholm Basin, environmental showcase severe hypoxia. (up to 270 nmol cm-3 sediment) was detected at all 18 stations along a 35-km transect basin typically extended as deep 1.6 cm into sediment....
pH in fungal biofilms is important for a variety of infections and industrial applications involving biofilms, but to date, it has never been measured directly inside the biofilm matrix. In present study, new methodology was developed allowing confocal microscopy based monitoring extracellular biofilms. Monospecies Aspergillus fumigatus, Candida albicans, dubliniensis Cryptococcus neoformans were stained with dependent ratiometric probe C-SNARF-4, imaged microscope, digital image analysis...
Abstract. The Sylt Roads pelagic time series covers physical and hydrochemical parameters at five neighboring stations in the Sylt-Rømø Bight, Wadden Sea, North Sea. Since beginning of 1973, sea surface temperature (SST), salinity, ammonium, nitrite, nitrate soluble reactive phosphorus (SRP) were measured twice a week. Other introduced later (dissolved silicate (Si) – since 1974, pH - 1979, dissolved organic nitrogen (DON) 1996, (DOP) 2001, chlorophyll suspended particulate matter (SPM)...
pH IN FUNGAL BIOFILMS The increasing focus on the involvement of Candida spp. in dental caries creates an interest monitoring inside fungal and cross-kingdom biofilms.We here present a confocal microscopy based methodology to measure biofilms using pHsensitive dye C-SNARF-4.STAINING PROPERTIES OF C-SNARF-4 binds strongly cell walls all viable cells, as evidenced by counterstaining with SYTO9/propidium iodide.