Marc Rudolf results 28
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Lysine or histidine? examining the role of the proximal ligand at the active heme center of cytochrome c nitrite reductaseNARA Subscribed
The identity of the proximal ligand of its catalytic heme 1 center - lysine or histidine - may directly affect how efficiently pentaheme cytochrome c nitrite reductase catalyzes the six-electron reduction of nitrite (NO 2 − ) to ammonium (NH 4 + ) and may also alter substrate specificity. This reaction is part of the pathway of dissimilatory nitrate reduction to ammonium, which competes with denitrification and avoids the form...
Multispecies environmental DNA metabarcoding sheds light on annual coral spawning eventsNARA Subscribed
Synchronous multispecific coral spawning generally occurs annually and forms an integral part of the coral life cycle. Apart from spawning times and species participation, however, much else remains unknown. Here, we applied environmental DNA (eDNA) metabarcoding to study two tropical reef sites of contrasting coral cover before, during and after coral spawning. Using coral‐ITS2 and vertebrate‐12S markers, we evaluated eDNA as...
Purpose The incidence of small intestinal cancer (SIC) is increasing, however, its aetiology remains unclear due to a lack of data from large-scale prospective cohorts. We examined modifiable risk factors in relation to SIC overall and by histological subtype. Methods We analysed 450,107 participants enrolled in the European Prospective Investigation into Cancer and Nutrition cohort. Cox proportional hazards models were used t...
De novo mutations in FBRSL1 cause a novel recognizable malformation and intellectual disability syndromeNARA Subscribed
We report truncating de novo variants in specific exons of FBRSL1 in three unrelated children with an overlapping syndromic phenotype with respiratory insufficiency, postnatal growth restriction, microcephaly, global developmental delay and other malformations. The function of FBRSL1 is largely unknown. Interestingly, mutations in the FBRSL1 paralogue AUTS2 lead to an intellectual disability syndrome (AUTS2 syndrome). We deter...
In situ abundance and carbon fixation activity of distinct anoxygenic phototrophs in the stratified seawater lake RogoznicaNARA Subscribed
Summary Sulphide‐driven anoxygenic photosynthesis is an ancient microbial metabolism that contributes significantly to inorganic carbon fixation in stratified, sulphidic water bodies. Methods commonly applied to quantify inorganic carbon fixation by anoxygenic phototrophs, however, cannot resolve the contributions of distinct microbial populations to the overall process. We implemented a straightforward workflow, consisting of...
Summary Among the dominant deltaproteobacterial sulfate‐reducing bacteria ( SRB ), members of the genus D esulfobacula are not only present in (hydrocarbon‐rich) marine sediments, but occur also frequently in the anoxic water bodies encountered in marine upwelling areas. Here, we present the 5.2 Mbp genome of D esulfobacula toluolica Tol2 , which is the first of an aromatic compound‐degrading, marine SRB . The genome has appar...
Bacterial sulfur cycling shapes microbial communities in surface sediments of an ultramafic hydrothermal vent fieldNARA Subscribed
Summary The ultramafic‐hosted Logatchev hydrothermal field (LHF) is characterized by vent fluids, which are enriched in dissolved hydrogen and methane compared with fluids from basalt‐hosted systems. Thick sediment layers in LHF are partly covered by characteristic white mats. In this study, these sediments were investigated in order to determine biogeochemical processes and key organisms relevant for primary production. Tempe...
Novel groups of Gammaproteobacteria catalyse sulfur oxidation and carbon fixation in a coastal, intertidal sedimentNARA Subscribed
Summary The oxidation of hydrogen sulfide is essential to sulfur cycling in marine habitats. However, the role of microbial sulfur oxidation in marine sediments and the microorganisms involved are largely unknown, except for the filamentous, mat‐forming bacteria. In this study we explored the diversity, abundance and activity of sulfur‐oxidizing prokaryotes (SOP) in sulfidic intertidal sediments using 16S rRNA and functional g...
A microdiversity study of anammox bacteria reveals a novel Candidatus Scalindua phylotype in marine oxygen minimum zonesNARA Subscribed
Summary The anaerobic oxidation of ammonium (anammox) contributes significantly to the global loss of fixed nitrogen and is carried out by a deep branching monophyletic group of bacteria within the phylum Planctomycetes . Various studies have implicated anammox to be the most important process responsible for the nitrogen loss in the marine oxygen minimum zones (OMZs) with a low diversity of marine anammox bacteria. This compr...
Whole genome analysis of the marine Bacteroidetes ‘ Gramella forsetii ’ reveals adaptations to degradation of polymeric organic matterNARA Subscribed
Summary Members of the Bacteroidetes , formerly known as the Cytophaga‐Flavobacteria‐Bacteroides (CFB) phylum, are among the major taxa of marine heterotrophic bacterioplankton frequently found on macroscopic organic matter particles (marine snow). In addition, they have been shown to also represent a significant part of free‐living microbial assemblages in nutrient‐rich microenvironments. Their abundance and distribution patt...
Diversity and vertical distribution of cultured and uncultured Deltaproteobacteria in an intertidal mud flat of the Wadden SeaNARA Subscribed
Summary The diversity and distribution of Deltaproteobacteria in an intertidal mud flat of the German Wadden Sea was characterized by molecular biological techniques and cultivation. A 16S rRNA gene library generated with general primers (303 clones) suggested that sulfate‐reducing bacteria (SRB) related to Desulfobulbaceae and Desulfosarcina were abundant. Fluorescence in situ hybridization (FISH) with probes targeting these...
Phylogeny and distribution of nitrate‐storing Beggiatoa spp. in coastal marine sedimentsNARA Subscribed
Summary Filamentous sulphide‐oxidizing Beggiatoa spp. often occur in large numbers in the coastal seabed without forming visible mats on the sediment surface. We studied the diversity, population structure and the nitrate‐storing capability of such bacteria in the Danish Limfjorden and the German Wadden Sea. Their distribution was compared to the vertical gradients of O 2 , NO 3 – and H 2 S as measured by microsensors. The mai...