Andreas Schramm
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View article: Extracellular electron transfer in cable bacteria enables growth rates comparable to aerobic respiration
Extracellular electron transfer in cable bacteria enables growth rates comparable to aerobic respiration Open
Cable bacteria are filamentous sulphide-oxidisers performing long-distance electron transfer in redox-stratified sediments by transporting electrons over centimetre-scale distances to reduce oxygen. Here, we show that the freshwater cable …
View article: Microscale analyses of the effect of arginine on oral biofilms
Microscale analyses of the effect of arginine on oral biofilms Open
Arginine exerts caries-preventive effects via multiple mechanisms, including modulations of biofilm pH and matrix microarchitecture.
View article: Peculiar morphology of Asgard archaeal cells close to the prokaryote-eukaryote boundary
Peculiar morphology of Asgard archaeal cells close to the prokaryote-eukaryote boundary Open
The emergence of complex eukaryotic cells from prokaryotic ancestors is a major enigma in the history of life. Current data suggest that Asgard archaea are the closest prokaryotic relatives of eukaryotes and have a genetic potential for ce…
View article: Strong Memory, Weak Control: An Empirical Study of Executive Functioning in LLMs
Strong Memory, Weak Control: An Empirical Study of Executive Functioning in LLMs Open
Working memory, or the ability to hold and manipulate information in the mind, is a critical component of human intelligence and executive functioning. It is correlated with performance on various cognitive tasks, including measures of flu…
View article: A modified iChip for <i>in situ</i> cultivation of bacteria in arid environments
A modified iChip for <i>in situ</i> cultivation of bacteria in arid environments Open
Antimicrobial resistance is an ever-increasing problem for human health, and with only a few novel antimicrobials discovered in recent decades, an extraordinary effort is needed to circumvent this crisis. A promising source of new microbia…
View article: How LLMs Comprehend Temporal Meaning in Narratives: A Case Study in Cognitive Evaluation of LLMs
How LLMs Comprehend Temporal Meaning in Narratives: A Case Study in Cognitive Evaluation of LLMs Open
Large language models (LLMs) exhibit increasingly sophisticated linguistic capabilities, yet the extent to which these behaviors reflect human-like cognition versus advanced pattern recognition remains an open question. In this study, we i…
View article: pH-FISH: coupled microscale analysis of microbial identity and acid–base metabolism in complex biofilm samples
pH-FISH: coupled microscale analysis of microbial identity and acid–base metabolism in complex biofilm samples Open
pH-FISH combines microscale mapping of biofilm pH in real time with structural imaging of the local microbial architecture, and is a powerful method to explore the interplay between biofilm composition and metabolism in complex biological …
View article: Extracellular electron transfer genes expressed by candidate flocking bacteria in cable bacteria sediment
Extracellular electron transfer genes expressed by candidate flocking bacteria in cable bacteria sediment Open
Cable bacteria, filamentous sulfide oxidizers that live in sulfidic sediments, are at times associated with large flocks of swimming bacteria. It has been proposed that these flocks of bacteria transport electrons extracellularly to cable …
View article: Fungus Fighters: Wood Ants (Formica polyctena) and Their Associated Microbes Inhibit Plant-Pathogenic Fungi
Fungus Fighters: Wood Ants (Formica polyctena) and Their Associated Microbes Inhibit Plant-Pathogenic Fungi Open
Plant diseases cost the global economy billions of US dollars every year. The problem has mainly been addressed by using chemical pesticides, but recently, the use of ants has shown promising effects against plant pathogens. However, the m…
View article: Molecular Mechanisms of Temperature Tolerance Plasticity in an Arthropod
Molecular Mechanisms of Temperature Tolerance Plasticity in an Arthropod Open
How species thrive in a wide range of environments is a major focus of evolutionary biology. For many species, limited genetic diversity or gene flow among habitats means that phenotypic plasticity must play an important role in their capa…
View article: Increased biofilm formation in dual-strain compared to single-strain communities of Cutibacterium acnes
Increased biofilm formation in dual-strain compared to single-strain communities of Cutibacterium acnes Open
Cutibacterium acnes is a known opportunistic pathogen in orthopedic implant-associated infections (OIAIs). The species of C. acnes comprises distinct phylotypes. Previous studies suggested that C. acnes can cause single- as well as multi-t…
View article: The efficacy and safety of an enzyme-containing lozenge for dental biofilm control—a randomized controlled pilot trial
The efficacy and safety of an enzyme-containing lozenge for dental biofilm control—a randomized controlled pilot trial Open
Dental plaque is the main cause of caries, gingivitis, and periodontitis. The search for therapeutic adjuncts to mechanical plaque removal that have no harmful effects on the oral microbiome is important. Treatment with multiple plaque-mat…
View article: Two are better than one: increased biofilm formation in dual-type compared to single-type communities of Cutibacterium acnes
Two are better than one: increased biofilm formation in dual-type compared to single-type communities of Cutibacterium acnes Open
Cutibacterium acnes is a known opportunistic pathogen in orthopedic implant-associated infections (OIAIs). The species of C. acnes comprises distinct phylotypes. Previous studies suggested that C. acnes can cause single- as well as multi-t…
View article: Extracellular electron transfer genes expressed by candidate flocking bacteria in cable bacteria sediment
Extracellular electron transfer genes expressed by candidate flocking bacteria in cable bacteria sediment Open
Cable bacteria, filamentous sulfide oxidizers that live in sediments, are at times associated with large flocks of swimming bacteria. It has been proposed that these flocks of bacteria transport electrons extracellularly to cable bacteria …
View article: Combined pH ratiometry and fluorescence lectin-binding analysis (pH-FLBA) for microscopy-based analyses of biofilm pH and matrix carbohydrates
Combined pH ratiometry and fluorescence lectin-binding analysis (pH-FLBA) for microscopy-based analyses of biofilm pH and matrix carbohydrates Open
Bacterial biofilms have a complex and heterogeneous three-dimensional architecture that is characterized by chemically and structurally distinct microenvironments. Confocal microscopy-based pH ratiometry and fluorescence lectin-binding ana…
View article: 71th ORCA Congress
71th ORCA Congress Open
The aim of this study was to compare daily variation in urinary fluoride excretion (UFE) in children living in naturally fluoridated (FA) and non-fluoridated (NFA) areas in north-east England. Healthy children, aged 4-6 y, living in FA and…
View article: Does ecological drift explain variation in microbiome composition among groups in a social host species?
Does ecological drift explain variation in microbiome composition among groups in a social host species? Open
Within a given species, considerable inter-individual, spatial, and temporal variation in the composition of the host microbiome exists. In group-living animals, social interactions homogenize microbiome composition among group members, ne…
View article: Indications for a genetic basis for big bacteria and description of the giant cable bacterium <i>Candidatus</i> Electrothrix gigas sp. nov.
Indications for a genetic basis for big bacteria and description of the giant cable bacterium <i>Candidatus</i> Electrothrix gigas sp. nov. Open
Bacterial cells can vary greatly in size, from a few hundred nanometers to hundreds of micrometers in diameter. Filamentous cable bacteria also display substantial size differences, with filament diameters ranging from 0.4 to 8 µm. We anal…
View article: Biomineralization of mantis shrimp dactyl club following molting: Apatite formation and brominated organic components
Biomineralization of mantis shrimp dactyl club following molting: Apatite formation and brominated organic components Open
The stomatopod Odontodactylus scyllarus uses weaponized club-like appendages to attack its prey. These clubs are made of apatite, chitin, amorphous calcium carbonate, and amorphous calcium phosphate organized in a highly hierarchical struc…
View article: Corrigendum: A westernized diet changed the colonic bacterial composition and metabolite concentration in a dextran sulfate sodium pig model for ulcerative colitis
Corrigendum: A westernized diet changed the colonic bacterial composition and metabolite concentration in a dextran sulfate sodium pig model for ulcerative colitis Open
[This corrects the article DOI: 10.3389/fmicb.2023.1018242.].
View article: Social transmission of bacterial symbionts homogenizes the microbiome within and across generations of group-living spiders
Social transmission of bacterial symbionts homogenizes the microbiome within and across generations of group-living spiders Open
Disentangling modes and fidelity of symbiont transmission are key for understanding host–symbiont associations in wild populations. In group-living animals, social transmission may evolve to ensure high-fidelity transmission of symbionts, …
View article: Comparative electric and ultrastructural studies of cable bacteria reveal new components of conduction machinery
Comparative electric and ultrastructural studies of cable bacteria reveal new components of conduction machinery Open
Cable bacteria encompass at least two genera, and they are known to vary greatly in habitat preferences and filament thickness. We systematically investigated variations and similarities in cellular structures and electrical properties of …
View article: A westernized diet changed the colonic bacterial composition and metabolite concentration in a dextran sulfate sodium pig model for ulcerative colitis
A westernized diet changed the colonic bacterial composition and metabolite concentration in a dextran sulfate sodium pig model for ulcerative colitis Open
Introduction Ulcerative colitis (UC) is characterized by chronic inflammation in the colonic epithelium and has a blurred etiology. A western diet and microbial dysbiosis in the colon were reported to play a role in UC development. In this…