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Paper des Monats
- ja (19)
Flow-back and produced waters from shale gas and shale oil fields contain high ammonium, which can be formed by methanogenic degradation of methylamines into methane and ammonium. Methylamines are added to fracturing fluid to prevent clay swelling or can originate from metabolism of the osmolyte triglycinebetaine (GB).
We analyzed field samples from a shale gas reservoir in the Duvernay Formation and from a shale oil reservoir in the Bakken formation in Canada to determine the origin of high ammonium. Fresh waters used to make fracturing fluid, early flow-back waters, and late flow back waters from the shale gas reservoir had increasing salinity of 0.01, 0.58, and 2.66 Meq of NaCl, respectively. Microbial community analyses reflected this fresh water to saline transition with halophilic taxa including Halomonas, Halanaerobium, and Methanohalophilus being increasingly present. Early and late flow-back waters had high ammonium concentrations of 32 and 15 mM, respectively.
Such high concentrations had also been found in the Bakken produced waters.
Enrichment cultures of Bakken produced waters in medium containing mono, di-, or trimethylamine, or triglycinebetaine (GB) converted these substrates into ammonium (up to 20 mM) and methane. The methylotrophic methanogen Methanohalophilus, which uses methylamines for its energy metabolism and uses GB as an osmolyte, was a dominant community member in these enrichments. Halanaerobium was also a dominant community member that metabolizes GB into trimethylamine, which is then metabolized further by Methanohalophilus. However, the micromolar concentrations of GB measured in shale reservoirs make them an unlikely source for the 1,000-fold higher ammonium concentrations in flow-back waters. This ammonium either originates directly from the reservoir or is formed from methylamines, which originate from the reservoir, or are added during the hydraulic fracturing process. These methylamines are then converted into ammonium and methane by halophilic methylotrophic methanogens, such as Methanohalophilus, present in flow-back waters.
Vor nun 30 Jahren im Jahre 1989 wurde die erste Zulassung für eine Kunststoffdichtungsbahn von der BAM auf der Grundlage des „Niedersächsischen Dichtungserlasses“ erteilt. Vor ungefähr 10 Jahren wurde die BAM mit dem Erscheinen der Deponieverordnung (DepV) mit der Zulassung von Geokunststoffen, Polymeren und Dichtungskontrollsystemen beauftragt. Wir möchten dies zum Anlass nehmen, an dieser Stelle den viele ehrenamtlichen Experten des Fachbeirats und seiner Arbeitsgruppen für ihren Einsatz und die Unterstützung zu danken.
Darüber hinaus soll über aktuelle Arbeitsthemen und Entwicklungen im Fachbeirat berichtet werden. So soll in einer Sondersitzung des Fachbeirats über die Entlassung aus der Nachsorgephase beim Einsatz von Geokunststoffprodukten in Böschungen diskutiert werden. Es ist geplant, in einer Unterarbeitsgruppe eine Sitzung über die Fremdüber¬wachung in der Produktion abzuhalten. Darüber hinaus werden Änderungen in den Zulassungsrichtlinien für Kunststoff Dichtungsbahnen und Kunststoff Dränelemente kurz vorgestellt. In der Zwischenzeit wurde auch die abschließende Zulassungsrichtlinie für Geogitter verabschiedet. Neue Fragestellungen sind hier entstanden. Unter welchen Voraussetzungen können Geogitter in Zwischenabdichtungen eingesetzt werden. Bisher können diese Produkte formal nur in Oberflächenabdichtungen eingesetzt werden. Auch auf diese beiden Themen soll im Folgenden in Kürze eingegangen werden.
Vor nun 30 Jahren im Jahre 1989 wurde die erste Zulassung für eine Kunststoffdichtungsbahn von der BAM auf der Grundlage des „Niedersächsischen Dichtungserlasses“ erteilt. Vor ungefähr 10 Jahren wurde die BAM mit dem Erscheinen der Deponieverordnung (DepV) mit der Zulassung von Geokunststoffen, Polymeren und Dichtungskontrollsystemen beauftragt. Wir möchten dies zum Anlass nehmen, an dieser Stelle den viele ehrenamtlichen Experten des Fachbeirats und seiner Arbeitsgruppen für ihren Einsatz und die Unterstützung zu danken.
Darüber hinaus soll über aktuelle Arbeitsthemen und Entwicklungen im Fachbeirat berichtet werden. So soll in einer Sondersitzung des Fachbeirats über die Entlassung aus der Nachsorgephase beim Einsatz von Geokunststoffprodukten in Böschungen diskutiert werden. Es ist geplant, in einer Unterarbeitsgruppe eine Sitzung über die Fremdüber¬wachung in der Produktion abzuhalten. Darüber hinaus werden Änderungen in den Zulassungsrichtlinien für Kunststoff Dichtungsbahnen und Kunststoff Dränelemente kurz vorgestellt. In der Zwischenzeit wurde auch die abschließende Zulassungsrichtlinie für Geogitter verabschiedet. Neue Fragestellungen sind hier entstanden. Unter welchen Voraussetzungen können Geogitter in Zwischenabdichtungen eingesetzt werden. Bisher können diese Produkte formal nur in Oberflächenabdichtungen eingesetzt werden. Auch auf diese beiden Themen soll im Folgenden in Kürze eingegangen werden.
A wide range of methods are used to estimate the plant-availability of soil phosphorus (P). Published research has shown that the diffusive gradients in thin films (DGT) technique has a superior correlation to plant-available P in soils compared to standard chemical extraction tests. In order to identify the plantavailable soil P species, we combined DGT with infrared and P K- and L2,3-edge X-ray adsorption near edge structure (XANES) spectroscopy. This was achieved by spectroscopically investigating the dried binding layer of DGT devices after soil deployment. All three spectroscopic methods were able to distinguish between different kinds of phosphates (poly-, trimeta-, pyro- and orthophosphate) on the DGT binding layer. However, infrared spectroscopy was most sensitive to distinguish between different types of adsorbed inorganic and organic phosphates. Furthermore, intermediates of the time-resolved hydrolysis of trimetaphosphate in soil could be analyzed.
CFK-Abfälle werden trotz der bestehenden Verfahren zur Rückgewinnung der Carbonfasern zukünftig vermehrt anfallen. Für diese Abfälle wird nach technischen Lösungen der energetischen oder stofflichen Verwertung gesucht. Eine Möglichkeit ist die Nutzung der CFK-Abfälle als Primärkohleersatz im Lichtbogenofen bei der Stahlherstellung.
Copper-based fungicides are routinely used for wood and plant protection, which can lead to an enrichment of copper-tolerant microbial communities in soil. To investigate the effect of such wood preservatives on the soil fungal and bacterial community compositions, five different vineyard and fruit-growing soil environments were evaluated using incubation studies over time. Pine sapwood specimens were impregnated with either water or different biocide treatment solutions containing a mixture of copper, triazoles, and quaternary ammonium compounds (CuTriQAC), a mixture of triazoles and quaternary ammonium compounds (TriQAC), or copper alone (Cu). Specimens were incubated in soil from each sample site for 8, 16, 24, and 32 weeks. The effects of preservative treatment on the modulus of elasticity (MOE) of the wood specimens and on the soil fungal as well as bacterial community composition at the soil-wood interface were assessed by quantitative PCR and amplicon sequencing of the fungal internal transcribed spacer (ITS) region and bacterial 16S rRNA gene. Specimens impregnated with CuTriQAC and Cu showed decreased MOE and reduced fungal and bacterial copy numbers over time compared to those impregnated with water and TriQAC. Fungal but not bacterial community composition was significantly affected by wood preservative treatment. The relative abundance of members of the family Trichocomaceae compared to other genera increased in the presence of the Cu and CuTriQAC treatments at three sites, suggesting these to be Cu-tolerant fungi. In conclusion, the copper-containing treatments resulted in marginally increased MOE, lowered microbial gene copy numbers compared to those in the TriQAC and water treatments, and thus enhanced wood protection against soil microbial wood degradation
The termites are a derived eusocial lineage of otherwise non-social cockroaches. Understanding the proximal and ultimate drivers of this major evolutionary transition represents an important goal in biology. One outstanding question concerns the evolution of termite immunity, which is thought to have undergone broad-sweeping adaptations in order to enhance group-level immune protection. To understand the evolutionary origins of termite immunity, we conducted qualitative and quantitative transcriptome analyses along a gradient of sociality. Firstly, we aimed to identify large-scale genetic shifts in immune traits linked to eusociality by comparing immune gene repertoires in solitary and subsocial cockroaches and across a range of eusocial termite lineages. Secondly, we compared the responses of a solitary cockroach, a subsocial wood-roach and different castes of a lower termite species to a non-specific immune challenge, in order to understand how sociality may have influenced the evolution of immune gene regulation. Firstly, we found that termites have a broadly representative repertoire of canonical immune genes as compared to gregarious cockroaches and subsocial wood-roaches. Secondly, with respect to immune challenge, the solitary cockroach and the subsocial wood-roach displayed a similarly comprehensive induced response, while the termite response was considerably dampened by comparison and strongly influenced by caste; with reproductives displaying a generally higher constitutive level of immune-gene expression compared to sterile castes. In summary we did not find termite eusociality to be associated with significant changes in immune gene diversity, but rather to be linked with significant modifications to the regulation of immunity following the origin of division of labour.
A non-invasive methodological approach has been carried out to identify the pigments and classify the binding media of the reverse painting on glass Kreuzabnahme (1914/15) by Carlo Mense.
Mense was a member of the group Rhenish Expressionists around August Macke and got interested in the technique of painting on the reverse side of a glass panel. The studied painting indicates a remarkably painted reverse and front side, which creates a unique visual appearance of the glass. The applied noninvasive, spectroscopic approach includes X-ray fluorescence, VIS spectroscopy, Raman spectroscopy and diffuse reflectance infrared Fourier transform spectroscopy. The measurements revealed inorganic Pigments mixed with drying oil as binder. Together with common pigments, such as lead white, barium sulphate, bone black, cinnabar, chrome yellow, ochre, and viridian, an unusual additional material was found, Strontium white.
This work presents a technical investigation of two Chinese reverse glass paintings from the late 19th and early 20th centuries. A multi-analytical, non-invasive approach (X-ray fluorescence (XRF), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), Raman spectroscopy) was used to identify the pigments and classify the binding media. The results reveal a combined use of traditional Chinese and imported European materials. Several pigments like cinnabar, lead white, orpiment, carbon black and copper-arsenic green (probably emerald green) were found in both paintings; red lead, artificial ultramarine blue, Prussian blue and ochre appear in at least one of the paintings. The proof of limewash (calcite and small amounts of portlandite) as a backing layer in Yingying and Hongniang indicates that clamshell white was also used for reverse glass paintings. Drying oil was classified as a binding media in most areas of both paintings. However, the orange background of The Archer yielded prominent bands of both proteinaceous and fatty binder.
Treatment and reusing of hazardous wastes have become significant issues of modern societies. Blast furnace sludge (BFS) and electric arc furnace dust (EAFD) are such typical wastes, because they usually contain high amounts of undesirable elements such as zinc (Zn) and lead (Pb).
These elements can cause operational problems in reusing of BFS and EAFD. In this study, the Ferro Duo GmbH and the Federal Institute for Materials Research and Testing have investigated a novel approach for eliminating and/or recovering Zn and Pb from both wastes. Applied was a selective chlorination and volatilization of Zn and Pb as chlorides at temperatures between 500 °C and 1100 °C. Both product obtained, Zn and Pb in the form of ZnCl2 and PbCl2 and the purified solid mineral compound are attractive materials for further use. Hydrochloric acid and iron(II) chloride were used as chlorination agents. Exceptionally high Zn and Pb removal efficiencies of >99.5 % could be achieved with both chlorination agents, whereby iron(II) chloride exhibited better performance.
Test methods for efficacy assessment of antimicrobial coatings are not modelled on a hospital environment, and instead use high humidity (>90%) high temperature (37 ◦C), and no airflow. Therefore, an inoculum will not dry, resulting in an antimicrobial surface exhibiting prolonged antimicrobial activity, as moisture is critical to activity. Liquids will dry quicker in a hospital ward, resulting in a reduced antimicrobial efficacy compared to the existing test, rendering the test results artificially favourable to the antimicrobial claim of the product. This study aimed to assess how hospital room environmental conditions can affect the drying time of an inoculum, and to use this data to inform test parameters for antimicrobial efficacy testing based on the hospital ward. The drying time of different droplet sizes, in a range of environmental conditions likely found in a hospital ward, were recorded (n = 630), and used to create a model to inform users of the experimental conditions required to provide a drying time similar to what can be expected in the hospital
ward. Drying time data demonstrated significant (p < 0.05) variance when humidity, temperature, and airflow were assessed. A mathematical model was created to select environmental conditions for in vitro antimicrobial efficacy testing. Drying time in different environmental conditions demonstrates that experimental set-ups affect the amount of time an inoculum stays wet, which in turn may affect the efficacy of an antimicrobial surface. This should be an important consideration for hospitals and other potential users, whilst future tests predict efficacy in the intended end-use environment.
Column leaching tests are frequently used and accepted for investigation of release of hazardous substances from solid materials. Independent of differences due to the field of application or national regulations, column tests assume that local equilibrium is established in the experiment which facilitates transfer of results to field conditions. In the process of harmonization and standardization within Europe the question on the influence of flow rate and grain size distribution on the local equilibrium was raised. Thus, a set of experiments using two different masonry materials with varying grain size distribution and flow rate were conducted including stop/flow experiments. Results are compared to a numerical model which takes intraparticle pore diffusion-controlled release of Mo and V into the percolating water into account. Due to the relatively high intraparticle porosity of the materials (24–29%) data and model indicate that initially equilibrium-state conditions prevail followed by rapidly decreasing concentrations. The model fits data for Mo and V reasonably well; however, after the initial decline of concentrations (at L/S > 2) extended tailing is observed especially of elements occurring as oxides, which is not captured by the model.
Territories of rock-inhabiting fungi: Survival on and alteration of solid air-exposed surfaces
(2018)
Subaerial biofilms that are omnipresent at the interface between all solid substrates and the atmosphere are composed of a unique and widespread group of ascomycetes called rock-inhabiting fungi or microcolonial fungi (MCF), typically in communities with other microorganisms. While subaerial biofilms in toto have important roles in mineral weathering and biodeterioration of materials, methodological approaches to subaerial biofilm communities are diverse and frequently focussed on MCF. Here, we review the historical development of the research methods applied in the field and consider perspectives to increase our understanding of the biofilm-induced changes of solid substrate surfaces.
Biochemische und physiologische Charakterisierung der extrazellulären Matrix eines Modellbiofilms
(2018)
An der Grenzschicht zwischen einer festen Oberfläche und der umgebenden Luft wachsende subaerische Biofilme (SAB) zeichnen sich durch eine erhöhte Toleranz gegenüber extremen Umweltbedingungen und dem Eintrag von Bioziden aus. Dieser Schutz vor äußeren Umwelteinflüssen wird vornehmlich durch den Beitrag von extrazellulären polymeren Substanzen (EPS) und Pigmenten, wie Melanin und Carotinoiden, vieler unterschiedlicher Organismen gewährleistet. Deren Synthese wird wiederum durch intrazelluläre Botenstoffe reguliert. Das Cyanobakterium Nostoc punctiforme und der mikrokoloniale Pilz Knufia petricola, als Partner eines etablierten SAB-Modells und Vertreter zweier typischer Organismengruppen in SAB, wurden genutzt, um Botenstoffe und Pigmente genetisch zu manipulieren und die Biofilmmatrix dieser Mutanten strukturell zu untersuchen. In dieser Arbeit konnten erstmals die EPS beider Organismen extrahiert und die Struktur der extrazellulären Polysaccharide beschrieben werden. Daneben wurden die extrazellulären Polysaccharide von K. petricola Wildtyp mit denen verschiedener Pigmentmutanten verglichen. Das Fehlen des Schutzpigmentes Melanin führte zu einer ausgeprägteren extrazellulären Matrix in den Biofilmen. Gleichzeitig änderte sich die Struktur der extrazellulären Polysaccharide. Während der Wildtyp zu ~80% ein α-Glucan und zu ~20% ein α/β-Galaktomannan sekretierte, war der Anteil des Galaktomannans bei den Melaninmutanten erhöht. Das Ausschalten der Carotinoid-Synthese hatte jedoch keinen Einfluss auf die Beschaffenheit der extrazellulären Polysaccharide. Ein deutlich komplexeres extrazelluläres Polysaccharid aus acht verschiedenen Monosaccharid-Einheiten bildete N. punctiforme. Durch die Überproduktion des bakteriellen sekundären Botenstoffes c-di-GMP konnte zudem ein grundlegender Einfluss auf die Reaktion des Cyanobakteriums gegenüber externen Signalen und die damit verbundene Zelldifferenzierung gezeigt werden. Ein artifiziell erhöhtes c-di-GMP-Level in den Zellen führte zur Ausbildung eines sessilen Lebensstils durch Hemmung der Differenzierung motiler Hormogonien und vermehrte Produktion von EPS. Die Struktur der extrazellulären Polysaccharide wurde dadurch nicht verändert. Neben der strukturellen Analyse konnten die Veränderungen der extrazellulären Matrix beider Organismen zusätzlich durch mikroskopische Methoden visualisiert werden. Beide Organismen steuern komplexe Polymere, deren Produktion maßgeblich mit intrazellulären Faktoren verknüpft ist, zu der extrazellulären Matrix des Modellbiofilms bei.
Gegenstand der vorzustellenden Arbeiten ist die Prüfung der Umweltbeständigkeit und -verträglichkeit von Materialien und Produkten hinsichtlich der Emission von potenziellen Schadstoffen in die Umwelt. Hierzu werden chemisch-physikalische Einflüsse (Bewitterung) und mikrobielle Beanspruchungen an Modellmaterialien evaluiert. So werden die Freisetzungsraten von Schadstoffen in Abhängigkeit der Beanspruchung beschrieben. Als Modellmaterialien kommen die Polymere Polystyrol (PS) und Polypropylen (PP) zum Einsatz, die jeweils mit polybromierten Flammschutzmitteln (PBFSM) versehen sind. Synergistische Effekte der Bewitterungsparameter und der mikrobiologischen Beanspruchung sollen dabei ebenso betrachtet werden, wie die gezielte Alterung. Auch findet eine Beschreibung des Verhaltens der ausgetragenen Schadstoffe in den Umweltkompartimenten Boden oder Wasser statt. Hier sind mit Hilfe der zu entwickelnden Screening- und non-Target-Analyseverfahren die Transformation und der Metabolismus durch Mikroorganismen zu beschreiben. Auch soll mit Hilfe der RFA und der LA-ICP-MS die Abreicherung der PBFSM in den Modellmaterialien beschrieben werden. Aus den Ergebnissen sollen Korrelationen zwischen den künstlichen Alterungsverfahren und realen Szenarien abgeleitet werden.
Our understanding of RNA viruses from edible insects is minimal at best, with studies largely focusing on model insect species and those associated with obvious signs of disease. This represents a considerable gap in understanding, given the growing role of insects as a source of food and feed, as well as the more general relevance of insects in agriculture and health. Illness due to entomophagy is rare but well documented, including fatal cases following the consumption of termites. Termites are eaten commonly in tropical Asia, Africa and South America, and are among the insects with the highest recorded fat content. There are many species of termites, with a wide range of diets and habitats centering around the consumption of wood and soil substrates. In this study, we report the results from a survey of more than 30 cockroach and termite transcriptomes, with the aim of understanding the diversity and evolution of RNA viruses as well as other potentially pathogenic organisms that are associated with this relevant but somewhat overlooked group of insects. We discuss our results in the context of the possible zoonotic risk posed by insects, as well as in the context of emerging viral and other disease threats that may face insects being reared at industrial scales.
Technical advances in the study of molecular evolution have crystallized the fundamental insight that many bee pathogens evolve and adapt over timescales that overlap with host ecology. At the same time, the role played by bee host community ecology is increasingly being appreciated in host-parasite interactions. Here, we focus on Deformed wing virus (DWV) and present recent studies exploring the link between virulence, DWV genetic diversity and changes to host ecology - namely the arrival of an invasive ectoparasite, the Varroa destructor mite, which vectors viruses between honeybees. Specifically, we show how V. destructor may have created conditions for the emergence of more virulent strains of DWV in the western honeybee, Apis mellifera. We present a molecule-to-ecology framework to help interpret findings and to guide future hypotheses, emphasizing the role of molecular interactions between viruses and host immunity as drivers of change at the bee population level.
Bee populations have declined significantly in recent years and this is thought to be attributable at least in part to the (re-)emergence of viruses. These viruses are predominantly positive single stranded (+ss) RNA viruses belonging to the Picornavirales. Managed honeybees are often infested with the invasive mite, Varroa destructor, which vectors RNA viruses including Deformed wing virus (DWV, family Iflaviridae): a leading culprit of colony losses. Many bee viruses have been sequenced and structural features are now available for viruses such as DWV. DWV consists of at least 3 distinct genotypes, two of which have been shown to be differentially virulent in honeybees. Molecular studies have demonstrated that DWV has a mean evolutionary rate of 1.35 x 10-3 per site per year. For such viruses – in contrast to their eukaryotic hosts – ecological and evolutionary timescales significantly overlap. This rapid evolution allows RNA viruses to adapt quickly to novel host environments with recombination representing an additional key source of genetic variation. Interestingly, recombination between genotypes of DWV has recently been shown to be a common occurrence in honeybees. A challenge has been to develop bioinformatics tools that can accurately reconstruct viral haplotypes – including recombinants – from heterogenous high-throughput sequence data.
The impact of blood-to-blood Varroa destructor transmission on virus evolution represents an important question in bee virus research. Due to the nature of the V. destructor life cycle, predictions can be made about the potential impact of the mite on virus virulence evolution. Specifically, the developing honeybee host pupa should remain alive until close to the completion of metamorphosis to provide sufficient time for successful mite reproduction, including offspring mating. For optimal transmission, any virus found in a mature and mated daughter mite will hold a significant selective advantage over a virus found in an immature or unmated daughter mite – placing a cost on virus virulence that impacts honeybee pupae before mites can mate. On the other side, viruses replicating too slowly and with delayed virulence effects will hold a selective handicap because fewer transmission units will be found in mated mites. I have hypothesized that the evolution of virus virulence shifted following the arrival of V. destructor, with viruses, including recombinants and/or specific viral genotypes being selected for a level of virulence in pupae (and likely also in adults) that maximises R0, which represents the basic reproductive number of the virus in the host population. R0 is defined by the number of subsequent infections caused by a single infection and it must be greater than 1 for an infection to spread in a population. It is enhanced by maximising the number of transmission units passed to uninfected susceptible vectors, and ultimately hosts (Figure 1).
Honeybee viruses are also shared with sympatric wild bees and viral prevalence and sequence data indicate frequent virus transmission between managed and wild bee species. In addition to infecting the western honeybee (Apis mellifera), DWV can infect other Asian honeybee species such as Apis ceranae. Outside of honeybees, DWV has been found widely in bumblebees, including solitary bees and wasps and there is evidence that it can actively replicate in several Bombus and solitary bee species. Whether the arrival of the V. destructor mite in A. mellifera has driven viral emergence in non-Apis bees is a target of ongoing research.
Microbially influenced corrosion (MIC) of iron is usually attributed to sulfate-reducing microorganisms (SRM) which act upon the metal by the reactiveness of hydrogen sulfide, and by withdrawal of the available electrons in electrical contact with the metal. Methanogenic archaea can also cause MIC by directly withdrawing electrons from the iron surface for methanogenesis. However, the mechanistic details and kinetics of the overall process are poorly understood. Precipitation of siderite, a by-product of methanogenesis, (4Fe + 5HCO3 + 5H+ 4FeCO3 + CH4 + 3H2O) can lead to an insulating layer on the metal surface and lower the corrosion rate. Still, the extent of FeCO3 precipitation may be significantly influenced by environmental conditions such as pH and advective processes.