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Aim of the present study was the characterization of the RORa receptor (Retinoidrelated Orphan Receptor a). RORa is a member of the nuclear receptor family and is involved into the differentiation of Purkinje cells, inflammation, arteriosclerosis, and bone mineralization. Nuclear receptors are transcription factors and mediate biological responses within target cells to outer signals such as lipophilic hormones. They are involved in development, growth, differentiation, proliferation, apoptosis, and maintenance of homeostasis. Ligand binding, posttranslational modifications, and cofactor recruitment control their activity. Nearly all nuclear receptors share a common modular structure with an Nterminal A/B region, a DNA-binding domain (DBD) that is composed of two zinc finger motifs, a hinge region, and a C-terminal ligand-binding domain (LBD). The RORs comprise the subtypes RORa, RORb, and RORg, which are encoded by different genes. All isoforms of the respective subtypes only differ in their A/B domain. This study focused mainly on the exploration of the gene structure, expression, and subcellular distribution of RORa...
Metastatic rhabdomyosarcoma (RMS) is one of the most challenging tumor entities in pediatric oncology caused by treatment resistances and immune escape. Novel chimeric antigen receptor (CAR) immunotherapies as specific, effective and safe treatment provide antitumor cytotoxicity by soluble factors and ligands/receptor signals. Besides its intrinsic potential as innate immune cell the ErbB2-sprecific CAR-engineered natural killer (NK)-92 cell line NK-92/5.28.z also provides CAR-mediated cytotoxicity, resulting in a high lytic capacity against 2D and 3D RMS cell structures in vitro. Also in a xenograft model using immune deficient NOD/Scid/IL2Rγ-/- (NSG) mice inhibited NK-92/5.28.z the tumor growth as long as the cells were administered and therefore prolonged the survival of the animals. The NK-92/5.28.z were distributed by the blood circulation and subsequently infiltrated the tumor tissue. Due to the malignant origin of the NK-92 cell line the cells must be irradiated prior to the use in patients. While the irradiation hampered the proliferation of NK-92/5.28.z cells, the cytotoxicity against RMS cells in vitro is retained for at least 24 hours. In the xenograft model irradiated NK-92/5.28.z cells inhibited the tumor growth but to a lower extent than untreated cells, as irradiated cells have only a limited life span in vivo no durable persistence and remission was achieved. Therefore, combinatorial approaches were focused and while blocking of the PD-1/PD-L1 axis did not resulted in a significantly enhanced tumor cell lysis, the combinatorial treatment with proteasome inhibitor bortezomib exhibited a significant enhanced cytotoxicity against RMS cells at least in vitro. Bortezomib itself induces caspase mediated apoptosis and also the upregulates the expression of TRAIL receptor DR5. The corresponding ligand TRAIL is expressed on the surface of the NK-92/5.28.z and pursuing experiments with purified TRAIL and bortezomib revealed a synergism. NK-92/5.28.z as an off-the-shelf product is therefore feasible for the therapy of metastatic RMS, but it might be necessary to support the cytotoxicity by additive agents like proteasome inhibitor bortezomib to archive durable remission.
Another cell population suitable for RMS CAR-immunotherapy are cytokine induced killer (CIK) cells, a heterogenous cell population generated from autologous PBMCs consisting of T, NK and T-NK cells. Lentivirally transduced ErbB2-specific CAR-CIK cells were previously shown to inhibit the tumor engraftment in a RMS xenograft model. However, lentiviral transduced adoptive immunotherapies bear risks for the transfer in patients, therefore the Sleeping Beauty Transposon System (SBTS) as a non-viral method, which integrates the CAR coding DNA by a cut-and-paste mechanism from a minicircle (MC) into the CIK cells genome is more feasible for the generation of CAR-CIK cells. The Sleeping beauty transposase mRNA and the MC were transferred in the cell by nucleofection, different factors influence the transfection efficiency and viability of the CIK cells in this harsh procedure. In preliminary experiments with MC Venus, a MC encoding eGFP, the highest transfection efficiency with the best proliferative capacity was achieved with cells on day 3 of CIK culture and without the addition of autologous monocytes as feeder cells. For the CAR construct the protocol was further improved by adjusting crucial factors, for this construct the best results were achieved on day 0, without irradiated PBMCs as feeder cells and cultivation in X-Vivo10 medium supplemented with human fresh frozen plasma. The X-Vivo10 medium enhanced the percentage of NK- and T-NK cells significantly compared to CAR-CIK cells cultured in RPMI. Since the gene transfer by SBTS resulted in CAR-CIK cells stably expressing a CAR in all subpopulations, resulting in a significantly enhanced cytotoxicity against RMS cells in vitro, these cells were compared to lentiviral transduced CAR-CIK cells in vitro and in vivo. While the SBTS CAR-CIK cells were superior to viral CAR-CIK cells in 2D short-term assays, the viral cells showed higher lytic capacity in 3D spheroid long-term assays. In a RMS xenograft model lentiviral CAR-CIK cells significantly prolonged the survival of mice and persisted, whereas SBTS CAR-CIKs did not favor the overall survival compared to untreated controls and also did not persist. Phenotypic analysis revealed a highly cytotoxic CD8+ and late effector memory dominant phenotype for SBTS CAR-CIK cells supporting short-term cytotoxicity but also more prone for exhaustion, while viral CAR-CIK cells showed a more balanced phenotype for memory and cytotoxicity. Therefore, the SBTS is feasible for the ErbB2-CAR gene transfer in CAR-CIK resulting in a stable CAR-expression with high short-term cytotoxicity, but these cells are also more prone to exhaustion and the protocol might be adapted further to prevent this limitation for in vivo application.
This work underlines the hard-to-treat characteristics of metastatic RMS, but also shows some approaches for further evaluation like the combination of NK-92/5.28.z cells with bortezomib and the feasibility of the generation of CAR-CIK cells via SBTS.
In narratology, a widely recognized method involves exploring the connection between implied authors and implied readers. It entails correlating abstract narrative components within a text to understand the conveyed message and the multitude of interpretations it can offer. The present study adopts an implied reader-oriented approach to analyze three selected novels from the twentieth and twenty-first centuries—one Nigerian, one Caribbean, and one Kurdish. The aim is to explore the potential readings within these texts, considering the hermeneutic process of critical reading. The selected texts include Chinua Achebe’s Things Fall Apart, (1958), Same Selvon’s The Lonely Londoners, (1956), and Karwan Kakesur’s The Channels of the Armed Monkeys, (2011). This approach closely examines the communication between the author and reader of the text, with a special focus on the varying levels of communication between the components of the narration, including fictional and implied fictional communication.
The implied fictional communication occurs between a narrative agent known as ‘the implied author’ and its fictional counterpart ‘the implied reader’ rather than between the real, flesh and blood authors and readers. I argue that this level of communication is coded, and the act of decoding it is part of the reading process performed by the reader. Certain texts can propose different and sometimes opposing readings which are initially and purposefully designed by the implied author and addressed to different implied readers. These readings are not necessarily the results of different real readers but rather incorporated ones predetermined by the implied author only to be acknowledged and uncovered by the readers. In other words, the latent meaning is and always was an integral part of the text and is not something created by the imaginative reader or critic. The core interest of my thesis lies in identifying prompts and suggestions within the narrative of the selected texts and ultimately understanding the readerships prestructured in them. Identifying the different readers within those texts will provide new reinterpretations that can add undetected values to the reading process and sometimes suggests opposing readings to how those texts have so far been read. Additionally, it is the objective of this thesis to propose new ways that readers can interact with reading literature that would result in a more aesthetic and entertaining reading experience besides providing ways to be more informed and aware of the cues certain narrative texts contain.
There have been numerous critical studies on both narratology and postcolonial or minority literatures; however, there has been little scholarly work that attempts to utilize narratology as a theoretical foundation for understanding postcolonial and minority fiction.
This study examines fictional texts from Nigerian, Caribbean, and Kurdish literature, employing the narratological concept known as ‘Multiple Implied Readers’. By incorporating concepts from Brian Richardson’s ‘Singular Text, Multiple Implied Readers’, and Peter J. Rabinowitz’s ‘authorial audiences’, I explore the various readerships that the texts could encompass. This exploitation may lead to the discovery of new readings, interpretations, and meanings that would otherwise remain undetected. These structures introduce provocative indeterminacies that challenge the reader’s synthesis of information into coherent configurations of meaning. Consequently, this approach not only enhances the reading experience but also opens doors to new interpretations of the text. In some cases, these interpretations could even dismantle prior understandings and propose entirely new readings.
The concepts of the implied author and implied reader have been studied before in relation to various disciplines of narratology. However, by applying them in conjunction with the relatively less researched subject of multiple implied readers, I aim to shed light on important aspects of these readings. This exploration could prove beneficial for literature students as well as critical readers of literary texts, revealing the potential of these texts to accommodate more than one implied reader within their narratives.
While high-quality climate reconstructions of some past warm periods in the Cenozoic era now exist, the geological processes responsible for driving the observed longterm changes in atmospheric CO2 are not sufficiently well understood. The long-term change in atmospheric CO2 across the Cenozoic has been proposed to be driven by processes such as terrestrial weathering, organic carbon production and burial, reverse weathering, and volcanic degassing. One way of constraining the relative importance of the various driving forces proposed so far is to better understand the degree to which ocean chemistry has changed because the chemistry of seawater responds to geologic processes that drive atmospheric CO2. In addition, knowledge of the concentration of the major elements in seawater is crucial for accurately applying proxies such as those based on the boron isotopic composition and Mg/Ca of marine carbonates (a proxy for palaeo pH/CO2 and palaeotemperature, respectively). Previously reported records of seawater composition are primarily derived from fluid inclusions in marine evaporites; however, the results are sparse due to the limited availability of such deposits. In this thesis, changes in the Eocene seawater chemistry were reconstructed using trace element (elements/Ca) and isotopic (δ26Mg) proxies in a Larger Benthic Foraminifera (LBFs), i.e., Nummulites sp., to constrain the driving processes of long-term changes in seawater chemistry.
To achieve the objective of this thesis, first, a measurement protocol was established using LA-ICPMS to measure the K/Ca ratio simultaneously with other element/calcium ratios, which is challenging due to the interference of ArH+ on K+. Utilising this newly established measurement protocol, laboratory-cultured Operculina ammonoides grown at different seawater calcium concentrations ([Ca2+]), repeated at different temperatures, as well as modern O. ammonoides collected from different regions exhibiting a range of seawater parameters, were investigated. A significant correlation was observed between K/Casw and K/CaLBF, allowing K/CaLBF to potentially be used as a proxy for seawater major ion reconstructions. In addition, modern O. ammonoides demonstrated no significant influence of most seawater parameters (temperature, salinity, pH, or [CO32-]) on K/CaLBF. Modern O.
ammonoides were also assessed for their Mg isotopic composition (δ26Mg), revealing no significant effect of temperature or salinity on δ26MgLBF. Furthermore, the Mg isotopic fractionation in O. ammonoides was found to be close to that of inorganic calcite, indicating minimal vital effects in these large benthic foraminifera.
Operculina ammonoides is the nearest living relative of the abundant Eocene genus Nummulites, enabling the reconstruction of seawater chemistry using the calibration based on O. ammonoides. The trace elemental/calcium proxies, including Na/Ca, K/Ca, and Mg/Ca, as well as the δ26Mg proxy, were investigated in Eocene Nummulites. The result showed that during the Eocene, [Ca2+]sw was 1.6-2 times higher, while [K+]sw was ~2 times lower than the modern seawater composition. Furthermore, [Mg2+]sw decreased from the early Eocene (54.3− +9 7..69 mmol kg-1 at ~55 Ma) to Late Eocene (37.8− +4 4..3 4 mmol kg-1 at ~31 Ma), followed by
an increase toward modern seawater [Mg]. In contrast, the variability in δ26Mgsw values remained within a narrow range of ~0.3 ‰ throughout the Cenozoic. The reconstructed [Ca2+]sw agrees with the suggestion that Cenozoic seawater chemistry changes can be explained via a change in the seafloor spreading rate. When combined with existing records, the observed minimal change in δ26Mgsw with an increase in [Mg2+]sw suggests an additional possible role of a decrease in the formation of authigenic clay minerals coincident with the Cenozoic decline in deep ocean temperature, which is also supported by the increase in the [K+]sw reconstructed here for the first time. This finding highlights that the reduction in seafloor-spreading rate and decline in reverse weathering during the Cenozoic era has played a significant role in the evolution of seawater chemistry, emphasizing the importance of these processes in driving long-term changes in the carbon cycle.
The core of this work is represented by the investigation of the chiral phase transition, using Monte Carlo simulations and unimproved staggered fermions, both in the weak and strong coupling regimes of Quantum Chromodynamics. Based on recent results from Monte Carlo simulations, both using unimproved staggered fermions and Wilson fermions, the chiral phase transition in the continuum and chiral limit shows compatibility with a second-order phase transition for Nf (number of flavours) in range [2:7], at zero baryon chemical potential. This achievement relies on the analytic continuation of Nf to non-integer values on the lattice, which allows to make use of extrapolation techniques to the chiral limit, where simulations are not possible. Furthermore, these results provide a resolution to the ambiguous scenario for Nf = 2 in the chiral limt. The first part of this thesis is devoted to the investigation of the chiral phase transition when a non-zero imaginary baryon chemical potential is involved, whose value corresponds to the 81% of the Roberge-Weiss one. Using the same extrapolation techniques aforementioned, the order of the chiral phase transition in the continuum and chiral limit shows compatibility with a second-order phase transition for Nf in range [2:6], highlighting a lack of dependence of the order of the chiral phase transition on the imaginary baryon chemical potential value. The second part of this thesis is about the study of the extension of the first-order chiral region in the strong coupling regime, at zero baryon chemical potential. Using Monte Carlo techniques, this can be done by investigating the Z2 boundary on a coarse lattice, whose temporal extent reads Nt = 2, and simulations are realised for Nf = 4, 8. The results in the weak coupling regime show, for $Nt = 8, 6, 4 and fixed Nf value, an inflating first-order chiral region. As in the strong coupling limit a second-order chiral phase transition is expected, the first-order chiral region has to shrink as the strong coupling regime is approached, resulting in a non-monotonic behaviour of the Z2 boundary. For Nf = 8, a critical mass on the Z2 boundary has been obtained, confirming the expected non-monotonic behaviour. For Nf = 4 the results do not provide a unique conclusion: Either a Z2 boundary at extremely low bare quark mass or a second-order chiral phase transition in the O(2) universality class in the chiral limit can take place. In addition to the two main topics, the performances of the second-order minimum norm integrator (2MN) and the fourth-order minimum norm integrator (4MN) have been compared, after implementing the 4MN one in the CL2QCD code used to realise our simulations. The 2MN integrator had already been implemented in the code since the first version was released. The two integrators belong to the class of symplectic integrators and represent an essential component of the RHMC algorithm, involved in our investigation. This step is extremely important, in order to guarantee the best quality when collecting data from simulations, and the results of the comparison suggested to favor the 2MN integrator, for both the topics.
Abdominal aortic aneurysm (AAA) is the most common type of aortic aneurysm, which is defined as a dilation of the abdominal aorta over 3.0 cm or more. Surgical repair is the golden standard for the treatment of AAA, in which open surgical repair (OSR) and endovascular aneurysm repair (EVAR) are the main approaches. Technically speaking, the lesion segment of aueurysm is completely replaced by a graft during OSR, while in EVAR, the lesion is insulated by a stentgraft. EVAR is a less invasive treatment than OSR and shows a lower early mortality rate, although the long-term advantages of EVAR over OSR remain inconclusive.
Endoleak, especially the type II endoleak (T2EL), is a common complication after EVAR. According to research, 16-28% of the patients develop a T2EL after EVAR, and it accounts for nearly three in four of all types of endoleaks. Around 30-50% of the T2EL resolved spontaneously during the follow-up, however, it still causes a secondary intervention in many patients. Therefore, it is critical to monitor endoleaks after repair.
Patent aortic branches in the stent-overlapped area and vasa vasorum have been identified as potential sources of blood flow in T2EL. However, the mechanisms of biological changes or remodeling of the aneurysm sac after the repair are still not clear, but they have been considered to play an important role in the development of endoleaks. Unfortunately, it is impossible to obtain a tissue sample of the aortic wall in patients who underwent EVAR.
MicroRNAs (miRNAs) are a class of small single-stranded non-coding RNAs that inhibit the expression of target message RNA (mRNA). miR-29b/29c, miR-155, and miR-15a are miRNAs associated with regulating extracellular matrix (ECM) components, inflammation, and proliferation, respectively. All four miRNAs have been identified as biomarkers of AAA, not only in aneurysm tissue but also extracellular as circulating miRNAs. However, it is still unknown whether they can reflect the biological changes after AAA repair. Thus, we conducted a prospective study to investigate the changes in expression of circulating miR-29b, miR-29c, miR-155, and miR-15a before (T0), 3 days (T1), and 3 months (T2) after AAA repair.
A total of 39 patients were recruited for this study, 17 of whom were repaired by OSR and 22 of whom were repaired by EVAR. Four patients failed the T2 follow-up due to the Covid-19 pandemic. No significant changes were found in the expression of miR-29b, miR-29c, miR-155, and miR-15a. There were also no obvious differences between OSR and EVAR. However, the T1 expression of miR-15a was significantly lower in patients without endoleak after EVAR than in those who developed endoleak after EVAR and those who were repaired by OSR. Unfortunately, these differences did not persist to the T2 follow-up, and no other differences were found among these patients.
In summary, miR-15a is a miRNA that significantly changes in AAA patients. This study demonstrates that the expression of circulating miR-15a is lower in patients without endoleak three days after EVAR, compared to those who had endoleak after EVAR and those who underwent OSR. The results suggest that miR-15a might be involved in the early aortic remodeling after EVAR as an indicator of endoleak.
A powerful technique to distinguish the enantiomers of a chiral molecule is the Coulomb Explosion Imaging (CEI). This technique allows us to determine the handedness of a single molecule. In CEI, the molecule becomes charged by losing many electrons in a very short period of time by interacting with the light. The repulsion forces between the positive charged particles of the molecule leads the molecule to break into parts-fragments. By measuring the three vector momentum of (at least) four fragments, the handedness observable can be determined. In this thesis, CEI is induced by absorption of a single high energy photon, which creates an inner-shell hole (K shell) of the molecule. The subsequent cascade of Auger decays lead to fragmentation. We decided to work with the formic acid molecule in this thesis. Two different experiments were conducted. The first experiment focused on exciting electrons to different energy states, while the second experiment focused on extracting directly a photoelectron to the continuum and measure the angular distribution of the photoelectron in the molecular frame. The primary goal was to search for chiral signal in a pure achiral planar molecule under the previous electron processes. The results of these findings were further implemented to two more molecules.
In the framework of the LHC Injectors Upgrade Project (LIU), the CERN Proton Synchrotron Booster (PSB) went through major upgrades resulting in new effects to study, challenges to overcome and new parameter regimes to explore. To assess the achievable beam brightness limit of the machine, a series of experimental and computational studies in the transverse planes were performed. In particular, the new injection scheme induces optics perturbations that are strongly enhanced near the half-integer resonance. In this thesis, methods for dynamically measuring and correcting these perturbations and their impact on the beam performance will be presented. Additionally, the quality of the transverse beam distributions and strategies for improvement will be addressed. Finally, the space charge effects when dynamically crossing the half-integer resonance will be characterized. The results of these studies and their broader significance beyond the PSB will be discussed.
Methods using environmental DNA to explore and analyze biodiversity from previously unexplored habitats and ecosystems have become increasingly popular in recent years. This is particularly due to the potential reduction in necessary taxonomic expertise, the opportunity to assess microorganismal communities, and decreased time investments required to cover large spatial extents. In forests, the surface of tree bark is an important habitat for epiphytic diversity. Because of the large surface area rich in micro-niches, the seasonal stability of the substrate, and the longevity of trees, tree bark surfaces provide an ideal habitat for many species. Yet, we lack a comprehensive understanding of their communities and the environmental drivers behind the community assembly. These missing links hinder the exploration of the forest microbiome as a whole and limits our understanding of functions of a large forest habitat and its connections to other forest microbiomes. With a holistic eDNA metabarcoding approach, encompassing samples of three major taxonomic groups (e.g. bacteria, fungi, and green algae), as well as simultaneous collections from multiple forest habitats we can contribute to closing these gaps and increase our knowledge of the forest microbiome.
My dissertation is set within the framework of the Biodiversity Exploratories and was conducted in four parts: I. the establishment of an eDNA metabarcoding workflow to reveal the local diversity of the bark surface microbiome; II. the upscaling of the method to large geographic and environmental gradients to uncover the drivers of the microbiome; III. the integration of soil and bark samples to investigate compositional differences in two important forest habitats; IV. the evaluation of eDNA metabarcoding as a tool for biodiversity assessments of lichen diversity in forests.
In the first part, I developed a simple, cost-effective and fast sampling strategy to acquire eDNA samples from the bark of trees in forest ecosystems. Using readily available medical-specimen-collection swabs I sampled bark surfaces of individual trees in Central German forests and used metabarcoding to amplify marker genes of green algae, fungi and bacteria. From the sequencing reads I calculated the first diversity estimates of the major organismal groups of bark surface microbiomes from Central European forests. Overall the methodology produced reliable results, allowing for an expanded sampling in the second part.
In the second part of the dissertation, I expanded the sampling based on the results of part one. I collected bark surface samples from the three regions of the Biodiversity Exploratories covering large spatial and environmental gradients representative for Central European forests. The collection included composite samples from 150 plots and over 750 trees. Utilizing measurements of climatic and forest structure variables provided by the Biodiversity Exploratories, as well as my own community data, I identified the biotic and abiotic drivers behind alpha and beta diversity of the bark surface microbiome.
In the third part, I studied the differences between the bark surface as an unexplored and the soil as an example of a well characterized forest microbiome. Using only the fungal part of the large sampling campaign and soil samples obtained from the same plots at the same time, I assessed the commonalities and differences of the micro-communities of these distinct forest niches. Furthermore, I included two coniferous and one deciduous tree species to examine, if the effect of tree species, previously shown for soil microbiomes, also holds true for the bark surface.
In the last part of my dissertation, I used eDNA in a more applied way as a tool in biodiversity assessments of lichenized fungi. I compared the results from eDNA metabarcoding to an expert floristic mapping conducted in the same plots in 2007/2008. I assigned functional guilds to the fungal taxa obtained in the large sampling campaign and used a subset that was assigned as lichenized fungi.
In conclusion, I showed that eDNA metabarcoding is a valuable tool to reveal the unknown diversity of microorganisms in forest ecosystems. In particular, my results advance our understanding of the bark surface microbiome, an underexplored habitat within forests. The tightly linked interactions of the three major microbial groups underline that studies need to take holistic approaches across multiple taxonomic groups to deepen our understanding of processes governing the assembly of microbiomes. Results from my dissertation may serve as a foundation to inform hypotheses addressing the functions of forest microbiomes. The massive diversity data collected may also contribute to closing the gap in our understanding of macro-organisms and micro-organisms with respect to diversity distributions and patterns of richness, and serve as a baseline for predictions of biodiversity responses under future anthropogenic change.
Biotechnological processes offer better production conditions for a wide variety of goods of industrial interest. The production of aromatic compounds, for example, involves molecules of great value for cosmetic, plastic, agrochemical and pharmaceutic industries. However, the yield of such processes frequently prevents a proper implementtation that would allow the replacement of traditional production processes.
Numerous rational engineering approaches have been attempted to enhance metabolic pathways associated with desired products. Unfortunately, genetic modifications and heterologous pathway expression often lead to a higher metabolic burden on the producing organisms, ultimately leading to reduced production levels and fitness.
This project utilised adaptive laboratory evolution to better understand the development of synthetic cooperative consortia, using S. cerevisiae as a model organism. Specifically, a synthetic cooperative consortium was developed around the exchange of lysine and tyrosine, which was subjected to adaptive laboratory evolution aiming to induce mutations that would improve the system’s fitness either by enhanced production or upgraded stress resistance. Consequently, the mutant strains isolated after the evolution rounds were sequenced to identify relevant variations that could be related to the growth and production phenotypes observed.
The insights derived from this project are expected to contribute to further developing synthetic cooperative consortia with utilitarian purposes.