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Publications (45)
Iron sheet piles are widely used in flood protection, dike construction, and river bank reinforcement. Their corrosion leads to gradual deterioration and often makes replacement necessary. Natural deposit layers on these sheet piles can prevent degradation and significantly increase their life span. However, little is known about the mechanisms of...
Microorganisms are able to cause, but also to inhibit or protect against corrosion. Corrosion inhibition by microbial processes may be due to the formation of mineral deposition layers on metal objects. Such deposition layers have been found in archaeological studies on ancient metal objects, buried in soil, which were hardly corroded. Recent field...
Anaerobic ammonium-oxidizing (anammox) bacteria derive their energy for growth from the oxidation of ammonium with nitrite
as the electron acceptor. N2, the end product of this metabolism, is produced from the oxidation of the intermediate, hydrazine (N2H4). Previously, we identified N2-producing hydrazine dehydrogenase (KsHDH) from the anammox org...
Corrosion is the result of a series of chemical, physical and (micro) biological processes leading to the deterioration of materials such as steel and stone. It is a world-wide problem with great societal and economic consequences. Current corrosion control strategies based on chemically produced products are under increasing pressure of stringent...
Bacteriohopanepolyols (BHPs) are bacterial biomarkers with a likely potential to identify present and past methanotrophic communities. To unravel the methanotrophic community in peat bogs, we report the BHP signatures of type I and type II methanotrophs isolated from Sphagnum mosses and of an extreme acidophilic verrucomicrobial methanotroph. A typ...
Sphagnum peatlands are important ecosystems in the methane cycle. Methanotrophs living inside the dead hyaline cells or on the Sphagnum mosses are able to act as a methane filter and thereby reduce methane emissions. We investigated in situ methane concentrations and the corresponding activity and diversity of methanotrophs in different Sphagnum do...
Sphagnum peatlands are important ecosystems in the methane cycle. Methanotrophs in these ecosystems have been shown to reduce methane emissions and provide additional carbon to Sphagnum mosses. However, little is known about the diversity and identity of the methanotrophs present in and on Sphagnum mosses in these peatlands. In this study, we appli...
Sphagnum peatlands are important ecosystems in the methane cycle. Methane-oxidizing bacteria in these ecosystems serve as a methane
filter and limit methane emissions. Yet little is known about the diversity and identity of the methanotrophs present in and
on Sphagnum mosses of peatlands, and only a few isolates are known. The methanotrophic commun...
The role of the microbial processes governing methane emissions from tundra ecosystems is receiving in- creasing attention. Recently, cooperation between methan- otrophic bacteria and submerged Sphagnum was shown to reduce methane emissions but also to supply CO2 for pho- tosynthesis for the plant. Although this process was shown to be important in...
Peat bogs store up to a third of all terrestrial carbon on Earth 1, and are one of the largest natural sources of atmospheric methane2. Anaerobic degradation of submerged Sphagnum species-mosses that are prevalent in peat bogs across the globe-produces significant quantities of methane in these systems. However,a study on peat mosses in the Netherl...
Aerobic symbiotic methane-oxidizing bacteria (methanotrophs) in peat moss (Sphagnum spp.) play a vital role in the carbon cycle in peat bogs. They reduce methane emissions and provide CO2 to Sphagnum moss, resulting in effective in situ carbon recycling. To establish biomarkers for these methanotrophs, Sphagnum moss spp. were incubated with 13CH4 a...
Peat bogs cover only a small area of the Earth's surface, yet store up
to 30% of the global terrestrial carbon and are responsible for 10% of
the total methane flux to the atmosphere. Aerobic symbiotic methane
oxidizing bacteria (methanotrophs) in peat moss (Sphagnum) play a vital
role in the carbon cycle in peat bogs, reducing methane emissions an...
Symbiotic methane oxidizing bacteria (methanotrophs) in peat moss
(Sphagnum) reduce methane emissions from peat bogs and provide CO2for
photosynthesis, leading to effective in situ carbon
recycling(Raghoebarsing et al., Nature, 2005). To gain further insight
into this symbiosis, distinct Sphagnum species were collected from
different microhabitats...
CH4 emission from arctic wetlands is a potential positive feedback to climate change. However, these emissions show a strong spatial variation. In a northeast Siberian tundra area spatial variation over an order of magnitude (1-60 mg CH4 m2hr-1) has been observed in wetland vegetations with a similar water table. These spatial differences are relat...
