4.1 Biologische Materialschädigung und Referenzorganismen
Filtern
Dokumenttyp
- Zeitschriftenartikel (84) (entfernen)
Sprache
- Englisch (84) (entfernen)
Schlagworte
- Antimicrobial resistance (6)
- Bacteria (6)
- Biocides (6)
- Ectoine (5)
- Biofilm (4)
- Biofilms (4)
- Polyethylene (4)
- Wood protection (4)
- Disinfection (3)
- NAP-XPS (3)
- Osmoadaptation (3)
- Termites (3)
- Wood Protection (3)
- Antimicrobial (2)
- Bacterial adhesion (2)
- Biocorrosion (2)
- Brown-rot fungi (2)
- Condensed Matter Physics (2)
- DNA (2)
- Degradation (2)
- Energy Engineering and Power Technology (2)
- Evolution (2)
- Fuel Technology (2)
- Halomonas elongata (2)
- Horizontal gene transfer (2)
- Insect biotechnology (2)
- Isoptera (2)
- Keratin (2)
- Laser processing (2)
- Laser-induced periodic surface structures (LIPSS) (2)
- Leaching (2)
- MIC (2)
- Method development (2)
- Microbiologically influenced corrosion (2)
- NanoSIMS (2)
- Nanoparticles (2)
- Nosema ceranae (2)
- Osmia bicornis (2)
- Pseudomonas aeruginosa (2)
- Renewable Energy, Sustainability and the Environment (2)
- Tineola bisselliella (2)
- Wild bees (2)
- XPS (2)
- 2D nanomaterials (1)
- 3D printing (1)
- A-DNA conformation (1)
- Acidobacteria (1)
- Alkylating agents (1)
- Amphiphilic polymer (1)
- Anaerobic pathways (1)
- Anobium punctatum (1)
- Antagonism (1)
- Antibacterial (1)
- Antibacterial polymer (1)
- Antibacterial surfaces (1)
- Antibiotic resistance (1)
- Antibiotics (1)
- Antifouling (1)
- Antimicrobial coating (1)
- Antimicrobial test (1)
- Antimicrobials (1)
- Antiseptic agents (1)
- Artificial weathering (1)
- Aspergillus (1)
- Atomic and Molecular Physics and Optics (1)
- Automated analysis (1)
- BODIPY (1)
- Bacillus subtilis (1)
- Bacterial attachment (1)
- Bacterial cell cycle (1)
- Bacterial second messenger (1)
- Basidiomycetes (1)
- Bee diseases (1)
- Bee health (1)
- Beneficial microbes (1)
- Biocide tolerance (1)
- Biodeterioration (1)
- Biodeterioration and biodegradation (1)
- Biofilm formation (1)
- Biofilm quantification (1)
- Bioinformatics (1)
- Bioinformatics virology viruses software (1)
- Biokorrosion (1)
- Biological pest control (1)
- Biomimetic (1)
- Biosynthesis (1)
- Biphasic growth (1)
- C-di-GMP (1)
- COST action CA15114 AMICI (1)
- Calcareous deposits (1)
- Carbon steel (1)
- Carbon steel corrosion (1)
- Cathodic protection (1)
- Cell appendages (1)
- Cell studies (1)
- Cell-envelope (1)
- Cellulose synthase (1)
- Chemicals (1)
- Cleridae (1)
- Coleoptera (1)
- Compatible solute (1)
- Coniophora puteana (1)
- Conjugate (1)
- Conjugation (1)
- Coptotermes (1)
- Core microbiome (1)
- Cross-feeding (1)
- Cross-resistance (1)
- Cryo XPS (1)
- CuNPs (1)
- Cultural heritage (1)
- Cupriavidus campinensis (1)
- DSM 5009 (1)
- Decomposition point (1)
- Degradable polymer (1)
- Denitrification (1)
- Desert ecology (1)
- Dielectric heating (1)
- Dietary adaptation (1)
- Diffractive gratings (1)
- Direct laser writing (1)
- Disinfection Fuel (1)
- Disposal (1)
- Diversity (1)
- Drywood termite (1)
- Dye (1)
- E. coli (1)
- Efficacy (1)
- Electronic (1)
- Environment (1)
- Environmental conditions (1)
- Environmental simulations (1)
- Exocrine gland (1)
- External (1)
- Extremophile (1)
- F pili (1)
- Fenton-like reaction (1)
- Flow system (1)
- Fluorescence spectroscopy (1)
- Fluoride (1)
- Fluoride nanoparticles (1)
- Fluorides (1)
- Fluorolytic sol-gel synthesis (1)
- Fluorolytic sol−gel (1)
- Food fermentation (1)
- Fuel sorption (1)
- Functionalized graphene (1)
- Fungal decay (1)
- Fungicidal property (1)
- Fungiculture (1)
- Fusarium (1)
- Gene expression (1)
- Genome sequence (1)
- Geology (1)
- Graphene (1)
- Graphene–bacteria interaction (1)
- Growth-rate homeostasis (1)
- Gut symbionts (1)
- Halogenation (1)
- Halophilic bacteria (1)
- Healthcare (1)
- High density polyethylene (1)
- Holzschutzmittel (1)
- Hospital premises (1)
- Hydrogen permeation (1)
- Hydrogen storage (1)
- Hydrogenasen (1)
- Hydrophobic interaction (1)
- Hylotrupes bajulus, Anobium punctatum, natural durability, tropical wood, native wood. (1)
- Hyperarid (1)
- Hypopharynx (1)
- IR spectroscopy (1)
- Immunity (1)
- Infections (1)
- Insect evolution (1)
- Insecticide (1)
- Interdisciplinarity (1)
- Ionic liquid (1)
- Ir DNA staining approach (1)
- Issues (1)
- Korynetes caeruleus (1)
- Laboratory breeding (1)
- Labrum (1)
- Laser-induced nanostructures (1)
- Laser-modified surface (1)
- Life history data (1)
- Lifetime (1)
- Low alloy steel (1)
- Marek's virus (1)
- Mechanosensitive channel (1)
- Melting point (1)
- Melting temperature (1)
- Metabolic engineering (1)
- Metabolic flux analysis (1)
- Metabolic modeling (1)
- Metabolism (1)
- Metabolomics (1)
- Methane (1)
- Methanogen (1)
- Microbial adhesions (1)
- Microbial simulation, (1)
- Microbially Induced Corrosion (1)
- Microbiological influenced corrosion MIC (1)
- Micromonospora aurantiaca (1)
- Micropatterning (1)
- Microwaves (1)
- Model (1)
- Modeling (1)
- Modelling studies (1)
- Modified mycotoxins (1)
- Moisture (1)
- Moisture performance (1)
- Molecular clock (1)
- MscS (1)
- Mud volcanoe fluids (1)
- Multi-resistant bacteria (1)
- Multiple lines of evidence (1)
- Multiport (1)
- Mussel-inspired coating (1)
- Mussel-inspired materials (1)
- Mutation rate (1)
- Mycotoxin (1)
- Nano Particles (1)
- Natural durability (1)
- Natural products discovery (1)
- Near ambient x-ray photoelectron spectroscopy (1)
- Next generation sequencing (1)
- Nitrous oxide (1)
- Nonvolatile (1)
- One-step ionic liquids synthesis (1)
- Optical and Magnetic Materials (1)
- Osmotic shock (1)
- Osteogenesis (1)
- P. Fluorescens (1)
- Paper sizings (1)
- Particle synthesis (1)
- Pathogen spillover (1)
- Pathogen transmission (1)
- Performance (1)
- Permeability (1)
- Persian historical recipes (1)
- Persistence (1)
- Pest control (1)
- Phenotypic heterogeneity (1)
- Phenotypic variation (1)
- Photodynamic therapy (1)
- Photonics (1)
- Physical and optical characteristics (1)
- Plastic degradation (1)
- Polydopamine (1)
- Polyethylene terephthalate (1)
- Polyglycerol (1)
- Polyioinic liquid (1)
- Polymer-based products (1)
- Proteome (1)
- Pseudomonas fluorescens (1)
- Pseudomonas veronii (1)
- Ptinidae (1)
- Quasispecies (1)
- RNA-Sequencing (1)
- Radio waves (1)
- Reactive oxygen species (1)
- Reactor conditions (1)
- Resistance model (1)
- Rhizopus (1)
- Rhizopus and Aspergillus oryzae (1)
- Rhodonia placenta (1)
- Ruthenium (1)
- SEM (1)
- SEM micrography (1)
- SEM wood characterization (1)
- SIMS (1)
- Sc-ICP-ToF-MS (1)
- Self-assembled monolayer (1)
- Sensors (1)
- Silica and polystyrene nanoparticles (1)
- Silver (1)
- Single cell (1)
- Single cell microbiology (1)
- Social (1)
- Social insects (1)
- Software (1)
- Soil contact (1)
- Soldier (1)
- Solitary bees (1)
- Solute excretion (1)
- Spectral imaging (1)
- Standardisation (1)
- Suppression (1)
- Survival rates (1)
- Symbiosis (1)
- Synergy (1)
- Synthetic metabolism (1)
- Termite-associated microbes (1)
- Termitoidae (1)
- Thermodynamic (1)
- Thioimidazolium (1)
- Touch surfaces (1)
- Transcriptomics (1)
- UV-irradiation (1)
- Ultrastructure (1)
- Virology (1)
- Virulence (1)
- Viruses (1)
- Water (1)
- Water atmosphere (1)
- Water stable isotope analysis (1)
- Water uptake (1)
- White-rot fungi (1)
- Wood Modification (1)
- X-ray tomographic (1)
- Zearalenone (1)
- Zearalenone sulfate (1)
- a-zearalenol (1)
- dsDAN monolayer (1)
- iChip (1)
- pH probe (1)
- underexplored phyla (1)
Organisationseinheit der BAM
- 4 Material und Umwelt (84)
- 4.1 Biologische Materialschädigung und Referenzorganismen (84)
- 6 Materialchemie (17)
- 4.0 Abteilungsleitung und andere (8)
- 1 Analytische Chemie; Referenzmaterialien (7)
- 6.1 Oberflächen- und Dünnschichtanalyse (6)
- 6.2 Material- und Oberflächentechnologien (6)
- 5 Werkstofftechnik (3)
- 6.3 Strukturanalytik (3)
- 8 Zerstörungsfreie Prüfung (3)
Paper des Monats
- ja (6)
Spatial Period of Laser-Induced Surface Nanoripples on PET Determines Escherichia coli Repellence
(2021)
Bacterial adhesion and biofilm formation on surfaces are associated with persistent microbial contamination, biofouling, and the emergence of resistance, thus, calling for new strategies to impede bacterial surface colonization. Using ns-UV laser treatment (wavelength 248 nm and a pulse duration of 20 ns), laser-induced periodic surface structures (LIPSS) featuring different submicrometric periods ranging from ~210 to ~610 nm were processed on commercial poly(ethylene terephthalate) (PET) foils. Bacterial adhesion tests revealed that these nanorippled surfaces exhibit a repellence for E. coli that decisively depends on the spatial periods of the LIPSS with the strongest reduction (~91%) in cell adhesion observed for LIPSS periods of 214 nm. Although chemical and structural analyses indicated a moderate laser-induced surface oxidation, a significant influence on the bacterial adhesion was ruled out. Scanning electron microscopy and additional biofilm studies
using a pili-deficient E. coli TG1 strain revealed the role of extracellular appendages in the bacterial repellence observed here.
Lack of long-time stability of dsDNA-based supramolecular assemblies is an important issue that hinders their applications. In this work, 20 base pairs long dsDNA fragments [(dCdG)20
65%] composed of 65% dCdG and 35% dAdT nucleotides were tethered via a thiol to the surface of a gold electrode. The selfassembled (dCdG)20
-65% monolayer was immersed in solutions
containing ectoine, a compatible solute. Electrochemical results showed that these monolayers were stable for one month. In situ IR spectroscopy indicated that ectoine interacts weakly with the phosphate-ribose backbone, dehydrating the phosphate groups and stabilizing the A-DNA conformation. This structural reorganization led to a reorientation of nucleic acid base pairs and a local disruption of the double-helix structure. However, the conformation and orientation of the dsDNA fragment was stable in the
The clothes moth Tineola bisselliella is one of a few insects that can digest keratin, leading to the destruction of clothing, textiles and artwork. The mechanism of keratin digestion is not yet fully understood, partly reflecting the lack of publicly available genomic and transcriptomic data. Here we present a high-quality gut transcriptome of T. bisselliella generated from larvae reared on keratin-rich and keratin-free diets. The overall transcriptome consists of 428,221 contigs that were functionally annotated and screened for candidate enzymes involved in keratin utilization. As a mechanism for keratin digestion, we identified cysteine synthases, cystathionine β-synthases and cystathionine γ-lyases. These enzymes release hydrogen sulfite, which may reduce the disulfide bonds in keratin. The dataset also included 27 differentially expressed contigs with trypsin domains, among which 20 were associated with keratin feeding. Finally, we identified seven collagenases that were upregulated on the keratin-rich diet. In addition to this enzymatic repertoire potentially involved in breaking down keratin, our analysis of poly(A)-enriched and poly(A)-depleted transcripts suggested that T. bisselliella larvae possess an unstable intestinal microbiome that may nevertheless contribute to keratin digestion
The existence of microbial activity hotspots in temperate regions of Earth is driven by soil heterogeneities, especially the temporal and spatial availability of nutrients. Here we investigate whether microbial activity hotspots also exist in lithic microhabitats in one of the most arid regions of the world, the Atacama Desert in Chile. While previous studies evaluated the total DNA fraction to elucidate the microbial communities, we here for the first time use a DNA separation approach on lithic microhabitats, together with metagenomics and other analysis methods (i.e., ATP, PLFA, and metabolite analysis) to specifically gain insights on the living and potentially active microbial community. Our results show that hypolith colonized rocks are microbial hotspots in the desert environment. In contrast, our data do not support such a conclusion for gypsum crust and salt rock environments, because only limited microbial activity could be observed. The hypolith community is dominated by phototrophs, mostly Cyanobacteria and Chloroflexi, at both study sites. The gypsum crusts are dominated by methylotrophs and heterotrophic phototrophs, mostly Chloroflexi, and the salt rocks (halite nodules) by phototrophic and halotolerant endoliths, mostly Cyanobacteria and Archaea. The major environmental constraints in the organic-poor arid and hyperarid Atacama Desert are water availability and UV irradiation, allowing phototrophs and other extremophiles to play a key role in desert ecology.
This study details a theoretical analysis of leaky and waveguide modes in biperiodic all-dielectric holograms. By tuning diffraction orders and subsequently confining local density of optical states at two distinct resonance wavelengths, we present a new class of highly sensitive refractive index biosensing platforms that are capable of resolving 35.5 to 41.3 nm/RIU of spectral shift for two separate biological analytes.
Bacteria generally interact with the environment via processes involving their cell-envelope. Thus, techniques that may shed light on their surface chemistry are attractive tools for providing an understanding of bacterial interactions. One of these tools is Al Kα-excited photoelectron spectroscopy (XPS) with its estimated information depth of <10 nm. XPS-analyses of bacteria have been performed for several decades on freeze-dried specimens in order to be compatible with the vacuum in the analysis chamber of the spectrometer. A limitation of these studies has been that the freeze-drying method may collapse cell structure as well as introduce surface contaminants. However, recent developments in XPS allow for analysis of biological samples at near ambient pressure (NAP-XPS) or as frozen hydrated specimens (cryo-XPS) in vacuum. In this work, we have analyzed bacterial samples from a reference strain of the Gram-negative bacterium Pseudomonas fluorescens using both techniques. We compare the results obtained and, in general, observe good agreement between the two techniques. Furthermore, we discuss advantages and disadvantages with the two analysis approaches and the output data they provide. XPS reference data from the bacterial strain are provided, and we propose that planktonic cells of this strain (DSM 50090) are used as a reference material for surface chemical analysis of bacterial systems.
Frass (fine powdery refuse or fragile perforated wood produced by the activity of boring insects) of larvae of the European house borer (EHB) and of drywood termites was tested as a natural and novel feedstock for 3D-printing of wood-based materials. Small particles produced by the drywood termite Incisitermes marginipennis and the EHB Hylotrupes bajulus during feeding in construction timber, were used. Frass is a powdery material of particularly consistent quality that is essentially biologically processed wood mixed with debris of wood and faeces. The filigree-like particles flow easily permitting the build-up of woodbased structures in a layer wise fashion using the Binder Jetting printing process. The Quality of powders produced by different insect species was compared along with the processing steps and properties of the printed parts. Drywood termite frass with a Hausner Ratio HR = 1.1 with ρBulk = 0.67 g/cm3 and ρTap = 0.74 g/cm3 was perfectly suited to deposition of uniformly packed layers in 3D printing. We suggest that a variety of naturally available feedstocks could be used in environmentally responsible approaches to scientific material sciences/additive manufacturing.
Antimicrobials can exert specific physiological effects when used in combination that are different from those when applied alone. While combination effects have been extensively mapped for antibiotic-antibiotic combinations, the combination effects of antibiotics with antimicrobials used as biocides or antiseptics have not been systematically investigated. Here, we investigated the effects of combinations of antibiotics (meropenem, gentamicin, and ciprofloxacin) and substances used as biocides or antiseptics [octenidine, benzalkonium chloride, cetrimonium bromide, chlorhexidine, Povidone-iodine, silver nitrate (AgNO3), and Ag-nanoparticles] on the planktonic growth rate of Pseudomonas aeruginosa. Combination effects were investigated in growth experiments in microtiter plates at different concentrations and the Bliss interaction scores were calculated. Among the 21 screened combinations, we find prevalent combination effects with synergy occurring six times and antagonism occurring 10 times. The effects are specific to the antibiotic-biocide combination with meropenem showing a tendency for antagonism with biocides (6 of 7), while gentamicin has a tendency for synergy (5 of 7). In conclusion, antibiotics and biocides or antiseptics exert physiological combination effects on the pathogen P. aeruginosa. These effects have consequences for the efficacy of both types of substances and potentially for the selection of antimicrobial resistant strains in clinical applications with combined exposure (e.g., wound care and coated biomaterials).
Currently, corrosion rates (CR) and/or corrosion products (CP) obtained for methanogen-induced microbiologically influenced corrosion (Mi-MIC) on carbon steel are mainly analyzed from static-incubations. By using a multiport-flow-column, much higher CRs (0.72 mm/yr) were observed, indicating static-incubations are not suitable for determining the corrosive potential of Mi-MIC. With the combination of various analytical methods (ToF-SIMS/SEM-EDS/SEM-FIB) and contrary to previously published data, we observed that CPs contained phosphorus, oxygen, magnesium, calcium and iron but lacked carbon-related species (e.g. siderite). Overall, siderite nucleation is disrupted by methanogens, as they convert aqueous bicarbonate into carbon dioxide for methanogenesis resulting in increased localized corrosion.
The influence of interfacial pH between AISI 4135 steel and seawater under different polarization potentials on the formation of calcareous deposits has been studied. An interfacial pH of 9.61 at −0.9 V vs. SCE using state of the art iridium oxide microelectrode was found to be the critical pH for the precipitation of magnesium hydroxide. Calcareous deposits with a double-layer structure comprising an inner-brucite layer and an outer-aragonite layer were found to form at potentials between −1.0 V and −1.2 V vs. SCE. Furthermore, the facilitation of hydrogen permeation into steel induced by the formation of calcareous deposits was verified using the Devanathan-Stachurski electrochemical test. The mechanism of calcareous deposits facilitates hydrogen permeation into steel is related to its inhibition on hydrogen recombination and escape processes.