2,271 results on '"Benndorf A."'
Search Results
2. Direct GPCR-EGFR interaction enables synergistic membrane-to-nucleus information transfer
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Gekle, Michael, Eckenstaler, Robert, Braun, Heike, Olgac, Abdurrahman, Robaa, Dina, Mildenberger, Sigrid, Dubourg, Virginie, Schreier, Barbara, Sippl, Wolfgang, and Benndorf, Ralf
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- 2024
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3. Improved biological methanation using tubular foam-bed reactor
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Khesali Aghtaei, Hoda, Heyer, Robert, Reichl, Udo, and Benndorf, Dirk
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- 2024
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4. A high affinity switch for cAMP in the HCN pacemaker channels
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Porro, Alessandro, Saponaro, Andrea, Castelli, Roberta, Introini, Bianca, Hafez Alkotob, Anahita, Ranjbari, Golnaz, Enke, Uta, Kusch, Jana, Benndorf, Klaus, Santoro, Bina, DiFrancesco, Dario, Thiel, Gerhard, and Moroni, Anna
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- 2024
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5. Defect engineering of silicon with ion pulses from laser acceleration
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Redjem, Walid, Amsellem, Ariel J, Allen, Frances I, Benndorf, Gabriele, Bin, Jianhui, Bulanov, Stepan, Esarey, Eric, Feldman, Leonard C, Ferrer Fernandez, Javier, Garcia Lopez, Javier, Geulig, Laura, Geddes, Cameron R, Hijazi, Hussein, Ji, Qing, Ivanov, Vsevolod, Kanté, Boubacar, Gonsalves, Anthony, Meijer, Jan, Nakamura, Kei, Persaud, Arun, Pong, Ian, Obst-Huebl, Lieselotte, Seidl, Peter A, Simoni, Jacopo, Schroeder, Carl, Steinke, Sven, Tan, Liang Z, Wunderlich, Ralf, Wynne, Brian, and Schenkel, Thomas
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Affordable and Clean Energy - Abstract
Defect engineering is foundational to classical electronic device development and for emerging quantum devices. Here, we report on defect engineering of silicon with ion pulses from a laser accelerator in the laser intensity range of 1019 W cm−2 and ion flux levels of up to 1022 ions cm−2 s−1, about five orders of magnitude higher than conventional ion implanters. Low energy ions from plasma expansion of the laser-foil target are implanted near the surface and then diffuse into silicon samples locally pre-heated by high energy ions from the same laser-ion pulse. Silicon crystals exfoliate in the areas of highest energy deposition. Color centers, predominantly W and G-centers, form directly in response to ion pulses without a subsequent annealing step. We find that the linewidth of G-centers increases with high ion flux faster than the linewidth of W-centers, consistent with density functional theory calculations of their electronic structure. Intense ion pulses from a laser-accelerator drive materials far from equilibrium and enable direct local defect engineering and high flux doping of semiconductors.
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- 2023
6. Data-Supported Prediction of Surface Settlement Behavior on Opencast Mine Dumps Using Satellite-Based Radar Interferometry Observations
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Jörg Benndorf, Natalie Merkel, and Andre John
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opencast mine dumps ,settlement prediction ,radar interferometry ,uncertainty ,Mining engineering. Metallurgy ,TN1-997 - Abstract
To ensure the safe repurposing of post-mining landscapes, understanding and managing geotechnical risks, particularly ground movements such as settlements on opencast mining dump surfaces, is critical. Satellite-based radar interferometry (InSAR) technology offers highly detailed data on vertical ground movements with a high spatial and temporal resolution. By combining a data-driven approach, using InSAR-generated high-resolution datasets, with model-driven methods such as inverse modeling and classic time–settlement models, the efficient monitoring and prediction of opencast mine dump settlements can be achieved. This dual approach—leveraging advanced data analysis tools and precise modeling—yields valuable insights into spatial settlement behavior. In particular, classic time–settlement models are applied to the InSAR data through least square regression and Taylor approximation. The integration of both approaches enables the more robust, data-validated forecasts of key geotechnical indicators, such as the time to settlement stabilization and the expected maximum settlement over large areas. An application at a mine in central Germany illustrates the method by generating spatial predictions of the settlement behavior over more than 200 ha. In general, the results provide a comprehensive dataset for investigating other factors influencing the settlement behavior of opencast mine dumps.
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- 2024
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7. Differential Privacy for Protecting Private Patterns in Data Streams
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Gu, He, Plagemann, Thomas, Benndorf, Maik, Goebel, Vera, and Koldehofe, Boris
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Computer Science - Databases ,Computer Science - Cryptography and Security - Abstract
Complex event processing (CEP) is a powerful and increasingly more important tool to analyse data streams for Internet of Things (IoT) applications. These data streams often contain private information that requires proper protection. However, privacy protection in CEP systems is still in its infancy, and most existing privacy-preserving mechanisms (PPMs) are adopted from those designed for data streams. Such approaches undermine the quality of the entire data stream and limit the performance of IoT applications. In this paper, we attempt to break the limitation and establish a new foundation for PPMs of CEP by proposing a novel pattern-level differential privacy (DP) guarantee. We introduce two PPMs that guarantee pattern-level DP. They operate only on data that correlate with private patterns rather than on the entire data stream, leading to higher data quality. One of the PPMs provides adaptive privacy protection and brings more granularity and generalization. We evaluate the performance of the proposed PPMs with two experiments on a real-world dataset and on a synthetic dataset. The results of the experiments indicate that our proposed privacy guarantee and its PPMs can deliver better data quality under equally strong privacy guarantees, compared to multiple well-known PPMs designed for data streams.
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- 2023
8. No One Size (PPM) Fits All: Towards Privacy in Stream Processing Systems
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Fomichev, Mikhail, Luthra, Manisha, Benndorf, Maik, and Agnihotri, Pratyush
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Computer Science - Cryptography and Security - Abstract
Stream processing systems (SPSs) have been designed to process data streams in real-time, allowing organizations to analyze and act upon data on-the-fly, as it is generated. However, handling sensitive or personal data in these multilayered SPSs that distribute resources across sensor, fog, and cloud layers raises privacy concerns, as the data may be subject to unauthorized access and attacks that can violate user privacy, hence facing regulations such as the GDPR across the SPS layers. To address these issues, different privacy-preserving mechanisms (PPMs) are proposed to protect user privacy in SPSs. Yet, selecting and applying such PPMs in SPSs is challenging, since they must operate in real-time while tolerating little overhead. The multilayered nature of SPSs complicates privacy protection because each layer may confront different privacy threats, which must be addressed by specific PPMs. To overcome these challenges, we present Prinseps, our comprehensive privacy vision for SPSs. Towards this vision, we (1) identify critical privacy threats on different layers of the multilayered SPS, (2) evaluate the effectiveness of existing PPMs in addressing such threats, and (3) integrate privacy considerations into the decision-making processes of SPSs., Comment: Vision paper accepted to DEBS 2023
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- 2023
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9. From Hubble to Snap Parameters: A Gaussian Process Reconstruction
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Jesus, J. F., Benndorf, D., Pereira, S. H., and Escobal, A. A.
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
By using recent $H(z)$ and SNe Ia data, we reconstruct the evolution of kinematic parameters $H(z)$, $q(z)$, jerk and snap, using a model-independent, non-parametric method, namely, the Gaussian Processes. Throughout the present analysis, we have allowed for a spatial curvature prior, based on Planck 18 [1] constraints. In the case of SNe Ia, we modify a python package (GaPP) [2] in order to obtain the reconstruction of the fourth derivative of a function, thereby allowing us to obtain the snap from comoving distances. Furthermore, using a method of importance sampling, we combine $H(z)$ and SNe Ia reconstructions in order to find joint constraints for the kinematic parameters. We find for the current values of the parameters: $H_0 =67.2 \pm 6.2$ km/s/Mpc, $q_0 = -0.60^{+0.21}_{-0.18}$, $j_0=0.90^{+0.75}_{-0.65}$, $s_0=-0.57^{+0.52}_{-0.31}$ at 1$\sigma$ c.l. We find that these reconstructions are compatible with the predictions from flat $\Lambda$CDM model, at least for 2$\sigma$ confidence intervals., Comment: 18 pages, 6 figures
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- 2022
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10. Endovascular Management of a Ruptured Aneurysm on a Posterior Inferior Cerebellar Artery with Extradural C2-Origin: Case Report and Literature Review
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Rasmus Holmboe Dahl, Gary Lloyd Horn Jr, Zeyad Metwalli, Shankar Prakash Gopinath, and Goetz Benndorf
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aneurysm ,endovascular treatment ,extracranial ,vascular variant ,coil embolization ,Medicine (General) ,R5-920 ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Extracranial vascular pathology uncommonly causes intracranial subarachnoid hemorrhage (SAH). Among possible lesions are aneurysms at the craniocervical junction arising from a posterior inferior cerebellar artery (PICA) with an extradural origin. We describe a case of a 55-year-old female presenting with a sudden and severe headache. A computed tomography scan revealed a SAH within the fourth ventricle and cervical spinal canal, and a ruptured saccular aneurysm on a PICA with extradural C2-origin. Despite difficult access anatomy, endovascular treatment was feasible and resulted in subtotal initial occlusion and preservation of distal PICA flow. Upon 3-month follow-up, the aneurysm was completely occluded with a patent PICA. The patient’s clinical status remained stable at the 1.5-year follow-up. In conclusion, we present a rare case of an aneurysm originating from a PICA with extradural C2-origin that was treated endovascularly with preservation of the PICA.
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- 2024
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11. Detection, isolation and characterization of phage-host complexes using BONCAT and click chemistry
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Patrick Hellwig, Anna Dittrich, Robert Heyer, Udo Reichl, and Dirk Benndorf
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BONCAT ,click chemistry ,bacteriophage ,biotin ,proteomics ,LC–MS/MS ,Microbiology ,QR1-502 - Abstract
IntroductionPhages are viruses that infect prokaryotes and can shape microbial communities by lysis, thus offering applications in various fields. However, challenges exist in sampling, isolation and accurate prediction of the host specificity of phages as well as in the identification of newly replicated virions in response to environmental challenges.MethodsA new workflow using biorthogonal non-canonical amino acid tagging (BONCAT) and click chemistry (CC) allowed the combined analysis of phages and their hosts, the identification of newly replicated virions, and the specific tagging of phages with biotin for affinity chromatography.ResultsReplication of phage λ in Escherichia coli was selected as a model for workflow development. Specific labeling of phage λ proteins with the non-canonical amino acid 4-azido-L-homoalanine (AHA) during phage development in E. coli was confirmed by LC–MS/MS. Subsequent tagging of AHA with fluorescent dyes via CC allowed the visualization of phages adsorbed to the cell surface by fluorescence microscopy. Flow cytometry enabled the automated detection of these fluorescent phage-host complexes. Alternatively, AHA-labeled phages were tagged with biotin for purification by affinity chromatography. Despite biotinylation the tagged phages could be purified and were infectious after purification.DiscussionApplying this approach to environmental samples would enable host screening without cultivation. A flexible and powerful workflow for the detection and enrichment of phages and their hosts in pure cultures has been established. The developed method lays the groundwork for future workflows that could enable the isolation of phage-host complexes from diverse complex microbial communities using fluorescence-activated cell sorting or biotin purification. The ability to expand and customize the workflow through the growing range of compounds for CC offers the potential to develop a versatile toolbox in phage research. This work provides a starting point for these further studies by providing a comprehensive standard operating procedure.
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- 2024
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12. Crystal chemical investigations on TiU8S17 and U36Lu21S93I3 - ordered and disordered multinary uranium sulfides
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Michak, Marvin, Ruf, Thomas, Denecke, Reinhard, Benndorf, Christopher, Haben, Aaron, Kautenburger, Ralf, and Kohlmann, Holger
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- 2024
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13. Defect engineering of silicon with ion pulses from laser acceleration
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Redjem, Walid, Amsellem, Ariel J., Allen, Frances I., Benndorf, Gabriele, Bin, Jianhui, Bulanov, Stepan, Esarey, Eric, Feldman, Leonard C., Fernandez, Javier Ferrer, Lopez, Javier Garcia, Geulig, Laura, Geddes, Cameron R., Hijazi, Hussein, Ji, Qing, Ivanov, Vsevolod, Kante, Boubacar, Gonsalves, Anthony, Meijer, Jan, Nakamura, Kei, Persaud, Arun, Pong, Ian, Obst-Huebl, Lieselotte, Seidl, Peter A., Simoni, Jacopo, Schroeder, Carl, Steinke, Sven, Tan, Liang Z., Wunderlich, Ralf, Wynne, Brian, and Schenkel, Thomas
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Condensed Matter - Materials Science ,Condensed Matter - Mesoscale and Nanoscale Physics ,Physics - Accelerator Physics - Abstract
Defect engineering is foundational to classical electronic device development and for emerging quantum devices. Here, we report on defect engineering of silicon single crystals with ion pulses from a laser accelerator with ion flux levels up to 10^22 ions/cm^2/s. Low energy ions from plasma expansion of the laser-foil target are implanted near the surface and then diffuse into silicon samples that were locally pre-heated by high energy ions. We observe low energy ion fluences of ~10^16 cm^-2, about four orders of magnitude higher than the fluence of high energy (MeV) ions. In the areas of highest energy deposition, silicon crystals exfoliate from single ion pulses. Color centers, predominantly W and G-centers, form directly in response to ion pulses without a subsequent annealing step. We find that the linewidth of G-centers increase in areas with high ion flux much more than the linewidth of W-centers, consistent with density functional theory calculations of their electronic structure. Laser ion acceleration generates aligned pulses of high and low energy ions that expand the parameter range for defect engineering and doping of semiconductors with tunable balances of ion flux, damage rates and local heating.
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- 2022
14. Gaussian Processes Reconstruction of the Dark Energy Potential
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Jesus, J. F., Valentim, R., Escobal, A. A., Pereira, S. H., and Benndorf, D.
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Scalar Fields (SF) have emerged as natural candidates for dark energy as quintessential or phantom fields, as they are the main ingredient of inflation theories. Instead of assuming some form for the scalar field potential, however, this work reconstructs the SF potential directly from observational data, namely, \textbf{Hubble and SNe Ia data}. We show that two popular forms for the SF potentials, namely, the power-law and the quadratic free-field, are compatible with the reconstructions thus obtained, at least for some choices of the priors of the matter density and curvature parameters and for some redshift intervals., Comment: New analyzes and discussions included
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- 2021
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15. Microbiome modeling: a beginner's guide
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Emanuel Lange, Lena Kranert, Jacob Krüger, Dirk Benndorf, and Robert Heyer
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systems microbiology ,microbial ecology ,omics data integration ,human microbiome ,genome-scale modeling ,constraint-based modeling ,Microbiology ,QR1-502 - Abstract
Microbiomes, comprised of diverse microbial species and viruses, play pivotal roles in human health, environmental processes, and biotechnological applications and interact with each other, their environment, and hosts via ecological interactions. Our understanding of microbiomes is still limited and hampered by their complexity. A concept improving this understanding is systems biology, which focuses on the holistic description of biological systems utilizing experimental and computational methods. An important set of such experimental methods are metaomics methods which analyze microbiomes and output lists of molecular features. These lists of data are integrated, interpreted, and compiled into computational microbiome models, to predict, optimize, and control microbiome behavior. There exists a gap in understanding between microbiologists and modelers/bioinformaticians, stemming from a lack of interdisciplinary knowledge. This knowledge gap hinders the establishment of computational models in microbiome analysis. This review aims to bridge this gap and is tailored for microbiologists, researchers new to microbiome modeling, and bioinformaticians. To achieve this goal, it provides an interdisciplinary overview of microbiome modeling, starting with fundamental knowledge of microbiomes, metaomics methods, common modeling formalisms, and how models facilitate microbiome control. It concludes with guidelines and repositories for modeling. Each section provides entry-level information, example applications, and important references, serving as a valuable resource for comprehending and navigating the complex landscape of microbiome research and modeling.
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- 2024
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16. Human HspB1, HspB3, HspB5 and HspB8: Shaping these disease factors during vertebrate evolution
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Benndorf, Rainer, Velazquez, Ryan, Zehr, Jordan D, Pond, Sergei L Kosakovsky, Martin, Jody L, and Lucaci, Alexander G
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Biological Sciences ,Bioinformatics and Computational Biology ,Evolutionary Biology ,Biotechnology ,Genetics ,2.1 Biological and endogenous factors ,Aetiology ,Generic health relevance ,Animals ,Heat-Shock Proteins ,Heat-Shock Proteins ,Small ,Humans ,Molecular Chaperones ,Mutation ,Vertebrates ,alpha-Crystallin B Chain ,alpha-Crystallins ,Purifying selection ,Neuropathy ,Myopathy ,Disease-associated missense mutation ,Genetic dominance ,Genotype-phenotype relationship ,Alpha B-crystallin ,Genetic dominance ,Neuropathy ,Myopathy ,Biochemistry and Cell Biology ,Biochemistry & Molecular Biology ,Biochemistry and cell biology - Abstract
Small heat shock proteins (sHSPs) emerged early in evolution and occur in all domains of life and nearly in all species, including humans. Mutations in four sHSPs (HspB1, HspB3, HspB5, HspB8) are associated with neuromuscular disorders. The aim of this study is to investigate the evolutionary forces shaping these sHSPs during vertebrate evolution. We performed comparative evolutionary analyses on a set of orthologous sHSP sequences, based on the ratio of non-synonymous: synonymous substitution rates for each codon. We found that these sHSPs had been historically exposed to different degrees of purifying selection, decreasing in this order: HspB8 > HspB1, HspB5 > HspB3. Within each sHSP, regions with different degrees of purifying selection can be discerned, resulting in characteristic selective pressure profiles. The conserved α-crystallin domains were exposed to the most stringent purifying selection compared to the flanking regions, supporting a 'dimorphic pattern' of evolution. Thus, during vertebrate evolution the different sequence partitions were exposed to different and measurable degrees of selective pressures. Among the disease-associated mutations, most are missense mutations primarily in HspB1 and to a lesser extent in the other sHSPs. Our data provide an explanation for this disparate incidence. Contrary to the expectation, most missense mutations cause dominant disease phenotypes. Theoretical considerations support a connection between the historic exposure of these sHSP genes to a high degree of purifying selection and the unusual prevalence of genetic dominance of the associated disease phenotypes. Our study puts the genetics of inheritable sHSP-borne diseases into the context of vertebrate evolution.
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- 2022
17. Determination of the Kinematic Parameters from SNe Ia and Cosmic Chronometers
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Benndorf, D., Jesus, J. F., and Pereira, S. H.
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
In this work, by assuming a spatially flat Universe, we have tested 8 kinematic parametrization models with $H(z)$ data from Cosmic Chronometers and SNe Ia from Pantheon compilation. Our aim is obtain the current values for the Hubble constant ($H_0$), deceleration parameter ($q_0$), jerk ($j_0$) and snap ($s_0$) parameters independently from a dynamical model. By using a Bayesian model comparison, three models are favoured: a model with the deceleration parameter ($q$) linearly dependent on the redshift, $q$ linearly dependent on the scale factor and a model with a constant jerk. The model with constant jerk is slightly favoured by this analysis, furnishing $H_0=68.8^{+3.7}_{-3.6}$ km/s/Mpc, $q_0=-0.58\pm0.13$, $j_0=1.15^{+0.56}_{-0.53}$ and $s_0=-0.25^{+0.40}_{-0.30}$. The other models are compatible with the constant jerk model, except for the snap parameter, where we have found $s_0=4.0^{+3.4}_{-3.0}$ for the model with $q$ linearly dependent on the scale factor. (All uncertainties in the Abstract correspond to 95\% c.l.)., Comment: 23 pages, 7 figures
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- 2021
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18. Sub-Surface Soil Characterization Using Image Analysis: Material Recognition Using the Grey Level Co-Occurrence Matrix Applied to a Video-CPT-Cone
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Oksana Khomiak, Jörg Benndorf, and Gerald Verbeek
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soil texture characterization ,pixel-based image analysis ,grey level co-occurrence matrix ,Mining engineering. Metallurgy ,TN1-997 - Abstract
The geotechnical characterization of the subsurface is a key requirement for most soil investigations, incl. those for reclaiming landfills and waste dumps associated with mining operations. New sensor technology, combined with intelligent analysis algorithms, allow for a faster and less expensive acquisition of the necessary information without loss of data quality. The use of advanced technologies to support and back up common site investigation techniques, such as cone penetration testing (CPT), can enhance the underground characterization process. This study aims to investigate the possibilities of image analysis for material recognition to advance the geotechnical characterization process. The grey level co-occurrence matrix (GLCM) image processing technique is used in a wide range of study fields to estimate textures, patterns and structure anomalies. This method was adjusted and applied to process the video recorded during a CPT sounding, in order to distinguish soil types by its changing surface characteristics. From the results of the video processing, it is evident that the GLCM technique can identify transitions in soil types that were captured in the video recording. This enables the prospect of image analysis not just for soil investigations, but also for monitoring of the conveyor belt in the mining field, to allow for efficient preliminary decision making, material documentation and quality control by providing information in a cost effective and efficient manner.
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- 2024
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19. EGFR activation differentially affects the inflammatory profiles of female human aortic and coronary artery endothelial cells
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Virginie Dubourg, Gerald Schwerdt, Barbara Schreier, Michael Kopf, Sigrid Mildenberger, Ralf A. Benndorf, and Michael Gekle
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Medicine ,Science - Abstract
Abstract Endothelial cells (EC) are key players in vascular function, homeostasis and inflammation. EC show substantial heterogeneity due to inter-individual variability (e.g. sex-differences) and intra-individual differences as they originate from different organs or vessels. This variability may lead to different responsiveness to external stimuli. Here we compared the responsiveness of female human primary EC from the aorta (HAoEC) and coronary arteries (HCAEC) to Epidermal Growth Factor Receptor (EGFR) activation. EGFR is an important signal integration hub for vascular active substances with physiological and pathophysiological relevance. Our transcriptomic analysis suggested that EGFR activation differentially affects the inflammatory profiles of HAoEC and HCAEC, particularly by inducing a HCAEC-driven leukocyte attraction but a downregulation of adhesion molecule and chemoattractant expression in HAoEC. Experimental assessments of selected inflammation markers were performed to validate these predictions and the results confirmed a dual role of EGFR in these cells: its activation initiated an anti-inflammatory response in HAoEC but a pro-inflammatory one in HCAEC. Our study highlights that, although they are both arterial EC, female HAoEC and HCAEC are distinguishable with regard to the role of EGFR and its involvement in inflammation regulation, what may be relevant for vascular maintenance but also the pathogenesis of endothelial dysfunction.
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- 2023
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20. Do Major Pharmacovigilance Databases Support Evidence of Second Trimester NSAID and Third Trimester Paracetamol Fetotoxicity?
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Katarina Dathe, Carolin Benndorf, Simone Bergner, and Christof Schaefer
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anti-inflammatory agents ,non-steroidal [MeSH] ,acetaminophen [MeSH] pregnancy trimester ,second [MeSH] ,pregnancy trimester ,third [MeSH] ,Medicine ,Pharmacy and materia medica ,RS1-441 - Abstract
Background: Paracetamol and non-steroidal anti-inflammatory drugs (NSAIDs) are frequently used during pregnancy. Due to their fetotoxicity, NSAIDs are contraindicated during the third trimester. There is ongoing controversy about the extent to which NSAIDs may cause cardiovascular and renal impairment in the fetus earlier in the second trimester. Paracetamol, used as an effective treatment for closure of patent ductus arteriosus (PDA) after birth, is suspected to cause similar but unwanted effects during the third trimester of pregnancy. Methods: Three major pharmacovigilance databases (VigilanceCentral, EudraVigilance, and VigiBase) were searched for Individual Case Safety Reports (ICSRs; n = 1288) on fetotoxic effects that have been shown to result from NSAID exposure in late pregnancy. Results: In 219/1288 cases, an NSAID and/or paracetamol was taken after the first trimester, and the ICSR was not related to other reported risk factors. Out of these 219 ICSRs, 48 were exposed to NSAIDs in the second but not the third trimester or to paracetamol in the third trimester. Causality assessment was “probable or likely” in four NSAID reports and none of the paracetamol reports. Conclusions: The scarcity of adverse drug reactions (ADRs) in our study and in the literature, despite decades of pharmaceutical marketing and worldwide use of paracetamol as an analgesic of choice in the third trimester and the absence of formal contraindications against NSAIDs in the second trimester, speaks against a substantial cardiovascular and nephrotoxic risk of temporary use of NSAIDs in the second trimester or paracetamol in the third trimester. NSAIDs continue to be contraindicated in the third trimester.
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- 2024
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21. Investigations of Some Disordered Quaternary Compounds in the Systems Ag/Pb/Sb/Se and Ag/Pb/Sb/Te
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Maxim Grauer, Christopher Benndorf, Valentin Rohr, Carsten Paulmann, and Oliver Oeckler
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quaternary chalcogenides ,synchrotron radiation ,crystal structure determination ,cation disorder ,transport properties ,Crystallography ,QD901-999 - Abstract
Electrical and thermal transport measurements on quenched NaCl-type Ag1/3Pb1/3Sb1/3Se reveal an n-type semiconductor with a Seebeck coefficient up to −140 μVK−1 and a thermal conductivity as low as 0.52 WmK−1. Short-range order is indicated by disorder diffuse scattering in electron diffraction patterns. In contrast, 4L-Ag0.61Pb1.79Sb2.61Se6 (space group Cmcm with a = 4.2129(1) Å, b = 13.852(1) Å, and c = 20.866(1) Å, Z = 4) features the first lillianite-type structure in the system Ag/Pb/Sb/Se. It consists of slab-like NaCl-type building blocks that are interconnected via trigonal [PbSe6] prisms. As such structures typically do not form with Te as an anion, the first “sulfosalt-like” compound, Ag0.38Pb0.25Sb2.38Te4, in the system Ag/Pb/Sb/Te forms a layered tetradymite-like structure (space group R3-m with a = 4.2887(1) Å, c = 41.544(1) Å, Z = 3). Its slabs, which are separated by van der Waals gaps, are built up from three layers of distorted [MTe6] octahedra. Crystals of Ag0.38Pb0.25Sb2.38Te4 were grown by chemical transport.
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- 2024
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22. Generation of 'OP7 chimera' defective interfering influenza A particle preparations free of infectious virus that show antiviral efficacy in mice
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Tanya Dogra, Lars Pelz, Julia D. Boehme, Jan Kuechler, Olivia Kershaw, Pavel Marichal-Gallardo, Maike Baelkner, Marc D. Hein, Achim D. Gruber, Dirk Benndorf, Yvonne Genzel, Dunja Bruder, Sascha Y. Kupke, and Udo Reichl
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Medicine ,Science - Abstract
Abstract Influenza A virus (IAV) defective interfering particles (DIPs) are considered as new promising antiviral agents. Conventional DIPs (cDIPs) contain a deletion in the genome and can only replicate upon co-infection with infectious standard virus (STV), during which they suppress STV replication. We previously discovered a new type of IAV DIP “OP7” that entails genomic point mutations and displays higher antiviral efficacy than cDIPs. To avoid safety concerns for the medical use of OP7 preparations, we developed a production system that does not depend on infectious IAV. We reconstituted a mixture of DIPs consisting of cDIPs and OP7 chimera DIPs, in which both harbor a deletion in their genome. To complement the defect, the deleted viral protein is expressed by the suspension cell line used for production in shake flasks. Here, DIP preparations harvested are not contaminated with infectious virions, and the fraction of OP7 chimera DIPs depended on the multiplicity of infection. Intranasal administration of OP7 chimera DIP material was well tolerated in mice. A rescue from an otherwise lethal IAV infection and no signs of disease upon OP7 chimera DIP co-infection demonstrated the remarkable antiviral efficacy. The clinical development of this new class of broad-spectrum antiviral may contribute to pandemic preparedness.
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- 2023
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23. Vertebro-Vertebral Fistula Occlusion Using a Woven EndoBridge-Device
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Rasmus Holmboe Dahl, Mohammad Ghasemi-Rad, Vagn Eskesen, Susanne Christiansen Frevert, Christine Sølling, and Goetz Benndorf
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therapeutic embolization ,vertebral artery ,arteriovenous fistula ,web-device ,woven endobridge-device ,Medicine (General) ,R5-920 ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Vertebro-vertebral fistulas (VVFs) are vascular lesions that may develop after trauma or spontaneously in association with connective tissue disorders. We present a rare case of a post-traumatic VVF in a young patient presenting with a painless swelling and a bruit in her left upper neck. Digital subtraction angiography showed an arteriovenous fistula between the left vertebral artery (VA) and the vertebral venous plexus with significant steal phenomenon. Endovascular therapy was performed using a Woven EndoBridgeTM (WEB)-device combined with coils that allowed preservation of the VA. The patient fully recovered from her symptoms and follow-up imaging showed stable occlusion. In conclusion, VVFs can be effectively treated using intrasaccular flow diverters such as the WEB-device, allowing for complete and stable occlusion while preserving the parent artery.
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- 2023
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24. A Machine Learning Framework Reduces the Manual Workload for Systematic Reviews of the Diagnostic Performance of Prostate Magnetic Resonance Imaging
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Andrea Nedelcu, Benedict Oerther, Hannes Engel, August Sigle, Christine Schmucker, Ivo G. Schoots, Michel Eisenblätter, and Matthias Benndorf
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Automation ,Machine learning ,Meta-analysis ,Prostate magnetic resonance imaging ,Systematic review ,Prostate Imaging Reporting and Data System ,Diseases of the genitourinary system. Urology ,RC870-923 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Prostate magnetic resonance imaging has become the imaging standard for prostate cancer in various clinical settings, with interpretation standardized according to the Prostate Imaging Reporting and Data System (PI-RADS). Each year, hundreds of scientific studies that report on the diagnostic performance of PI-RADS are published. To keep up with this ever-increasing evidence base, systematic reviews and meta-analyses are essential. As systematic reviews are highly resource-intensive, we investigated whether a machine learning framework can reduce the manual workload and speed up the screening process (title and abstract). We used search results from a living systematic review of the diagnostic performance of PI-RADS (1585 studies, of which 482 were potentially eligible after screening). A naïve Bayesian classifier was implemented in an active learning environment for classification of the titles and abstracts. Our outcome variable was the percentage of studies that can be excluded after 95% of relevant studies have been identified by the classifier (work saved over sampling: WSS@95%). In simulation runs of the entire screening process (controlling for classifier initiation and the frequency of classifier updating), we obtained a WSS@95% value of 28% (standard error of the mean ±0.1%). Applied prospectively, our classification framework would translate into a significant reduction in manual screening effort. Patient summary: Systematic reviews of scientific evidence are labor-intensive and take a lot of time. For example, many studies on prostate cancer diagnosis via MRI (magnetic resonance imaging) are published every year. We describe the use of machine learning to reduce the manual workload in screening search results. For a review of MRI for prostate cancer diagnosis, this approach reduced the screening workload by about 28%.
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- 2023
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25. Fast functional mapping of ligand-gated ion channels
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Ralf Schmauder, Thomas Eick, Eckhard Schulz, Günther Sammler, Elmar Voigt, Günter Mayer, Holger Ginter, Günter Ditze, and Klaus Benndorf
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Biology (General) ,QH301-705.5 - Abstract
Abstract Ligand-gated ion channels are formed by three to five subunits that control the opening of the pore in a cooperative fashion. We developed a microfluidic chip-based technique for studying ion currents and fluorescence signals in either excised membrane patches or whole cells to measure activation and deactivation kinetics of the channels as well as ligand binding and unbinding when using confocal patch-clamp fluorometry. We show how this approach produces in a few seconds either unidirectional concentration-activation relationships at or near equilibrium and, moreover, respective time courses of activation and deactivation for a large number of freely designed steps of the ligand concentration. The short measuring period strongly minimizes the contribution of disturbing superimposing effects such as run-down phenomena and desensitization effects. To validate gating mechanisms, complex kinetic schemes are quantified without the requirement to have data at equilibrium. The new method has potential for functionally analyzing any ligand-gated ion channel and, beyond, also for other receptors.
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- 2023
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26. Can dark matter-dark energy interaction alleviate the Cosmic Coincidence Problem?
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Jesus, J. F., Escobal, A. A., Benndorf, D., and Pereira, S. H.
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
In this paper we study a model of interacting dark energy - dark matter where the ratio between these components is not constant, changing from early to late times in such a way that the model can solve or alleviate the cosmic coincidence problem (CP). The interaction arises from an assumed relation of the form $\rho_x \propto \rho_d^\alpha$, where $\rho_x$ and $\rho_d$ are the energy densities of dark energy and dark matter components, respectively, and $\alpha$ is a free parameter. For a dark energy equation of state parameter $w=-1$ we found that, if $\alpha=0$, the standard $\Lambda$CDM model is recovered, where the coincidence problem is unsolved. For $0<\alpha<1$, the CP would be alleviated and for $\alpha\sim 1$, the CP would be solved. The dark energy component is analyzed with both $w=-1$ and $w \neq -1$. Using Supernovae type Ia and Hubble parameter data constraints, in the case $w=-1$ we find $\alpha=0.109^{+0.062}_{-0.072}$ at 68% C.L., and the CP is alleviated. For $w\neq -1$, a degeneracy arises on the $w$ - $\alpha$ plane. In order to break such degeneracy we add cosmic microwave background distance priors and baryonic acoustic oscillations data to the constraints, yielding $\alpha=-0.075\pm 0.046$ at 68% C.L.. In this case we find that the CP is not alleviated even for 2$\sigma$ interval for $\alpha$. Furthermore, this last model is discarded against flat $\Lambda$CDM according to BIC analysis., Comment: 22 pages, 6 figures, revised version, with Bayesian Information Criterion (BIC) analysis included. Version published
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- 2020
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27. Kinetic fingerprinting of metabotropic glutamate receptors
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Kukaj, Taulant, Sattler, Christian, Zimmer, Thomas, Schmauder, Ralf, and Benndorf, Klaus
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- 2023
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28. Ground Subsidence above Salt Caverns for Energy Storage: A Comparison of Prediction Methods with Emphasis on Convergence and Asymmetry
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Aleksandra Babaryka and Jörg Benndorf
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salt caverns as energy storage ,subsidence prediction ,asymmetrical subsidence model ,salt cavern convergence ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Mining-induced subsidence can have significant environmental and infrastructural impacts, making subsidence engineering a crucial consideration. However, the unique nature of salt caverns and the increasing demand for reliable subsidence prediction models in the context of energy storage require special attention. This study provides a comparative analysis of existing prediction models and highlights their advantages and disadvantages to determine the most appropriate approach. The study primarily focuses on theoretically developing an empirical influence function for asymmetrical subsidence prediction. It significantly contributes to the field by correcting and extending the existing method, providing a generalized solution applicable to any type of asymmetrical distribution around the cavern. Future research directions include implementing the proposed model in relation to real-world data. The insights gained from this study can help advance subsidence prediction models in the field of salt cavern energy storage, addressing a significant need in the industry.
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- 2023
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29. Subtype-Specific Ligand Binding and Activation Gating in Homomeric and Heteromeric P2X Receptors
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Xenia Brünings, Ralf Schmauder, Ralf Mrowka, Klaus Benndorf, and Christian Sattler
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P2X receptors ,fluorescent ATP ,patch-clamp ,ligand binding ,membrane proteins ,Mg2+ modulation ,Microbiology ,QR1-502 - Abstract
P2X receptors are ATP-activated, non-specific cation channels involved in sensory signalling, inflammation, and certain forms of pain. Investigations of agonist binding and activation are essential for comprehending the fundamental mechanisms of receptor function. This encompasses the ligand recognition by the receptor, conformational changes following binding, and subsequent cellular signalling. The ATP-induced activation of P2X receptors is further influenced by the concentration of Mg2+ that forms a complex with ATP. To explore these intricate mechanisms, two new fluorescently labelled ATP derivatives have become commercially available: 2-[DY-547P1]-AHT-ATP (fATP) and 2-[DY-547P1]-AHT-α,βMe-ATP (α,βMe-fATP). We demonstrate a subtype-specific pattern of ligand potency and efficacy on human P2X2, P2X3, and P2X2/3 receptors with distinct relations between binding and gaiting. Given the high in vivo concentrations of Mg2+, the complex formed by Mg2+ and ATP emerges as an adequate ligand for P2X receptors. Utilising fluorescent ligands, we observed a Mg2+-dependent reduction in P2X2 receptor activation, while binding remained surprisingly robust. In contrast, P2X3 receptors initially exhibited decreased activation at high Mg2+ concentrations, concomitant with increased binding, while the P2X2/3 heteromer showed a hybrid effect. Hence, our new fluorescent ATP derivatives are powerful tools for further unravelling the mechanism underlying ligand binding and activation gating in P2X receptors.
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- 2024
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30. Laundry Isolate Delftia sp. UBM14 Capable of Biodegrading Industrially Relevant Aminophosphonates
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Ramona Riedel, Karsten Meißner, Arne Kaschubowski, Dirk Benndorf, Marion Martienssen, and Burga Braun
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phosphonates ,biodegradation ,PhnX ,PhnJ ,PhnCDE ,laundry detergents ,Biology (General) ,QH301-705.5 - Abstract
Phosphonates such as ethylenediaminetetra (methylenephosphonic acid) (EDTMP) and aminotris (methylenephosphonic acid) (ATMP) are used every day in water treatment processes or in household products. Their consumption is still increasing, regardless of the debates on their environmental impact. Here, the microbial characterisation and determination of the biodegradation potential of selected industrially relevant phosphonates for the isolate Delftia sp. UMB14 is reported. The opportunistic strain was isolated from a biofilm that was derived from a conventional washing machine using conventional detergents containing phosphonates. In antimicrobial susceptibility testing, the strain was only susceptible to sulfonamide, tetracycline, and chloramphenicol. Physiological and biochemical characteristics were determined using the BIOLOG EcoPlate assay. Most importantly, the strain was shown to convert D-malic acid and D-mannitol, as confirmed for strains of Delftia lacustris, and thus the new isolate could be closely related. Biodegradation tests with different phosphonates showed that the strain preferentially degrades ATMP and EDTMP but does not degrade glyphosate (GS) and amino (methylphosphonic acid) (AMPA). A specific gene amplification confirmed the presence of phnX (phosphonoacetaldehyde hydrolase) and the absence of PhnJ (the gene for the core component of C–P lyase). The presence of PhnCDE is strongly suggested for the strain, as it is common in Delftia lacustris species.
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- 2024
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31. Correction: Bayesian inference of kinetic schemes for ion channels by Kalman filtering
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Jan L Münch, Fabian Paul, Ralf Schmauder, and Klaus Benndorf
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Medicine ,Science ,Biology (General) ,QH301-705.5 - Published
- 2024
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32. Advancing vessel wall imaging in intracranial aneurysms: a crucial step towards improved patient management?
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Benndorf, Goetz
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- 2023
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33. Transcriptional impact of EGFR activation in human female vascular smooth muscle cells
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Dubourg, Virginie, Schwerdt, Gerald, Schreier, Barbara, Kopf, Michael, Mildenberger, Sigrid, Benndorf, Ralf A., and Gekle, Michael
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- 2023
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34. Physics design, construction and commissioning of the ICRH system for the stellarator Wendelstein 7-X
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Ongena, J., Castano-Bardawil, D., Crombé, K., Kazakov, Y.O., Schweer, B., Stepanov, I., Van Schoor, M., Vervier, M., Krämer-Flecken, A., Neubauer, O., Nicolai, D., Satheeswaran, G., Offermanns, G., Hollfeld, K.P., Benndorf, A., Dinklage, A., Hartmann, D., Kallmeyer, J.P., Wolf, R.C., and TEC
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- 2023
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35. Hemorrhage due to a pseudoaneurysm on a dural-pial anastomosis after decompression for Chiari malformation type I: case report
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Dahl, Rasmus Holmboe, Kelsen, Jesper, Hansen, Klaus, Hauerberg, John, and Benndorf, Goetz
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- 2022
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36. Mortality among patients treated for aneurysmal subarachnoid hemorrhage in Eastern Denmark 2017–2019
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Stauning, Agnes T., Eriksson, Frank, Benndorf, Goetz, Holst, Anders V., Hauerberg, John, Stavngaard, Trine, Poulsgaard, Lars, Rochat, Per, Eskesen, Vagn, Birkeland, Peter, Mathiesen, Tiit, and Munch, Tina N.
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- 2022
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37. Adaptation of a microbial community to demand-oriented biological methanation
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Hoda Khesali Aghtaei, Sebastian Püttker, Irena Maus, Robert Heyer, Liren Huang, Alexander Sczyrba, Udo Reichl, and Dirk Benndorf
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Renewable energy ,Power to methane ,Biological methanation ,Biogas upgrade ,Hydrogenotrophic methanogens ,Acetoclastic methanogens ,Biotechnology ,TP248.13-248.65 ,Fuel ,TP315-360 - Abstract
Abstract Background Biological conversion of the surplus of renewable electricity and carbon dioxide (CO2) from biogas plants to biomethane (CH4) could support energy storage and strengthen the power grid. Biological methanation (BM) is linked closely to the activity of biogas-producing Bacteria and methanogenic Archaea. During reactor operations, the microbiome is often subject to various changes, e.g., substrate limitation or pH-shifts, whereby the microorganisms are challenged to adapt to the new conditions. In this study, various process parameters including pH value, CH4 production rate, conversion yields and final gas composition were monitored for a hydrogenotrophic-adapted microbial community cultivated in a laboratory-scale BM reactor. To investigate the robustness of the BM process regarding power oscillations, the biogas microbiome was exposed to five hydrogen (H2)-feeding regimes lasting several days. Results Applying various “on–off” H2-feeding regimes, the CH4 production rate recovered quickly, demonstrating a significant resilience of the microbial community. Analyses of the taxonomic composition of the microbiome revealed a high abundance of the bacterial phyla Firmicutes, Bacteroidota and Thermotogota followed by hydrogenotrophic Archaea of the phylum Methanobacteriota. Homo-acetogenic and heterotrophic fermenting Bacteria formed a complex food web with methanogens. The abundance of the methanogenic Archaea roughly doubled during discontinuous H2-feeding, which was related mainly to an increase in acetoclastic Methanothrix species. Results also suggested that Bacteria feeding on methanogens could reduce overall CH4 production. On the other hand, using inactive biomass as a substrate could support the growth of methanogenic Archaea. During the BM process, the additional production of H2 by fermenting Bacteria seemed to support the maintenance of hydrogenotrophic methanogens at non-H2-feeding phases. Besides the elusive role of Methanothrix during the H2-feeding phases, acetate consumption and pH maintenance at the non-feeding phase can be assigned to this species. Conclusions Taken together, the high adaptive potential of microbial communities contributes to the robustness of BM processes during discontinuous H2-feeding and supports the commercial use of BM processes for energy storage. Discontinuous feeding strategies could be used to enrich methanogenic Archaea during the establishment of a microbial community for BM. Both findings could contribute to design and improve BM processes from lab to pilot scale.
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- 2022
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38. Ex vivo γH2AX assay for tumor radiosensitivity in primary prostate cancer patients and correlation with clinical parameters
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Ioana M. Marinescu, Manuel Rogg, Simon Spohn, Moritz von Büren, Marius Kamps, Cordula A. Jilg, Elena Fountzila, Kyriaki Papadopoulou, Lara Ceci, Alisa Bettermann, Juri Ruf, Matthias Benndorf, Sonja Adebahr, Daniel Zips, Anca L. Grosu, Christoph Schell, and Constantinos Zamboglou
- Subjects
Prostate cancer ,Intrinsic radio sensitivity ,γH2AX foci ,Standardized uptake values ,Radiotherapy ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Backround Accurate surrogate parameters for radio resistance are warranted for individualized radiotherapy (RT) concepts in prostate cancer (PCa). The purpose of this study was to assess intertumoral heterogeneity in terms of radio resistance using an ex-vivo γH2AX assay after irradiation of prostate biopsy cores and to investigate its correlation with clinical features of respective patients as well as imaging and genomic features of tumor areas. Methods Twenty one patients with histologically-proven PCa and pre-therapeutic multiparametric resonance imaging and prostate-specific membrane antigen positron emission tomography were included in the study. Biopsy cores were collected from 26 PCa foci. Residual γH2AX foci were counted 24 h after ex-vivo irradiation (with 0 and 4 Gy) of biopsy specimen and served as a surrogate for radio resistance. Clinical, genomic (next generation sequencing) and imaging features were collected and their association with the radio resistance was studied. Results In total 18 PCa lesions from 16 patients were included in the final analysis. The median γH2AX foci value per PCa lesion was 3.12. According to this, the patients were divided into two groups (radio sensitive vs. radio resistant) with significant differences in foci number (p
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- 2022
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39. Response-monitored dual anti-platelet treatment in a patient with spontaneous post-partum four-vessel cervical artery dissection
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Ina Nørgaard, Jakob Stensballe, Götz Benndorf, and Thomas Truelsen
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Dissection ,Internal carotid artery ,Vertebral artery ,Dual anti-platelet treatment ,TRAP-test ,ADP-test ,Neurology. Diseases of the nervous system ,RC346-429 - Published
- 2023
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40. Enlightening activation gating in P2X receptors
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Sattler, Christian and Benndorf, Klaus
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- 2022
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41. Thermodynamic profile of mutual subunit control in a heteromeric receptor
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Schirmeyer, Jana, Hummert, Sabine, Eick, Thomas, Schulz, Eckhard, Schwabe, Tina, Ehrlich, Gunter, Kukaj, Taulant, Wiegand, Melanie, Sattler, Christian, Schmauder, Ralf, Zimmer, Thomas, Kosmalla, Nisa, Münch, Jan, Bonus, Michele, Gohlke, Holger, and Benndorf, Klaus
- Published
- 2021
42. Faster Acquisition and Improved Image Quality of T2-Weighted Dixon Breast MRI at 3T Using Deep Learning: A Prospective Study.
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Wilpert, Caroline, Schneider, Hannah, Rau, Alexander, Russe, Maximilian Frederic, Oerther, Benedict, Strecker, Ralph, Nickel, Marcel Dominic, Weiland, Elisabeth, Haeger, Alexa, Benndorf, Matthias, Mayrhofer, Thomas, Weiss, Jakob, Bamberg, Fabian, Windfuhr-Blum, Marisa, and Neubauer, Jakob
- Published
- 2025
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43. Data-Supported Prediction of Surface Settlement Behavior on Opencast Mine Dumps Using Satellite-Based Radar Interferometry Observations.
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Benndorf, Jörg, Merkel, Natalie, and John, Andre
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SPOIL banks ,RADAR interferometry ,SPATIAL behavior ,SPATIAL resolution ,LEAST squares - Abstract
To ensure the safe repurposing of post-mining landscapes, understanding and managing geotechnical risks, particularly ground movements such as settlements on opencast mining dump surfaces, is critical. Satellite-based radar interferometry (InSAR) technology offers highly detailed data on vertical ground movements with a high spatial and temporal resolution. By combining a data-driven approach, using InSAR-generated high-resolution datasets, with model-driven methods such as inverse modeling and classic time–settlement models, the efficient monitoring and prediction of opencast mine dump settlements can be achieved. This dual approach—leveraging advanced data analysis tools and precise modeling—yields valuable insights into spatial settlement behavior. In particular, classic time–settlement models are applied to the InSAR data through least square regression and Taylor approximation. The integration of both approaches enables the more robust, data-validated forecasts of key geotechnical indicators, such as the time to settlement stabilization and the expected maximum settlement over large areas. An application at a mine in central Germany illustrates the method by generating spatial predictions of the settlement behavior over more than 200 ha. In general, the results provide a comprehensive dataset for investigating other factors influencing the settlement behavior of opencast mine dumps. [ABSTRACT FROM AUTHOR]
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- 2024
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44. Establishing a Mineral Spectral Library for Hyperspectral Imaging of Ore in Underground Mines—A Case Study of Reiche Zeche, Germany.
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Salomidi, Avgousta, Benndorf, Jörg, and Barakos, George
- Abstract
Hyperspectral imaging has emerged as a powerful tool in mineral exploration and surface mining over the past three decades, with applications ranging from large-scale airborne surveys to close-range ground-based studies. However, related research in underground environments remains limited due to various environmental and technical challenges. This study focuses on establishing a hyperspectral library for the Reiche Zeche underground mine in Freiberg, Germany, thereby enhancing the application of hyperspectral techniques in underground settings. Following standard hyperspectral analysis procedures, samples were collected, hyperspectral data were acquired, and pre-processing and processing of these data were conducted. The analysis reveals distinct spectral profiles that effectively differentiated various geological zones within the mine. The goal was to create a hyperspectral library specific to this mine, setting a precedent for future underground studies and highlighting the potential of hyperspectral imaging techniques in mining operations. The success achieved at Reiche Zeche aims to encourage similar initiatives in other mines, promoting the broader adoption of these advanced techniques in underground environments. [ABSTRACT FROM AUTHOR]
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- 2024
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45. Do Major Pharmacovigilance Databases Support Evidence of Second Trimester NSAID and Third Trimester Paracetamol Fetotoxicity?
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Dathe, Katarina, Benndorf, Carolin, Bergner, Simone, and Schaefer, Christof
- Subjects
DRUG side effects ,PERSISTENT fetal circulation syndrome ,THIRD trimester of pregnancy ,PATENT ductus arteriosus ,ANTI-inflammatory agents - Abstract
Background: Paracetamol and non-steroidal anti-inflammatory drugs (NSAIDs) are frequently used during pregnancy. Due to their fetotoxicity, NSAIDs are contraindicated during the third trimester. There is ongoing controversy about the extent to which NSAIDs may cause cardiovascular and renal impairment in the fetus earlier in the second trimester. Paracetamol, used as an effective treatment for closure of patent ductus arteriosus (PDA) after birth, is suspected to cause similar but unwanted effects during the third trimester of pregnancy. Methods: Three major pharmacovigilance databases (VigilanceCentral, EudraVigilance, and VigiBase) were searched for Individual Case Safety Reports (ICSRs; n = 1288) on fetotoxic effects that have been shown to result from NSAID exposure in late pregnancy. Results: In 219/1288 cases, an NSAID and/or paracetamol was taken after the first trimester, and the ICSR was not related to other reported risk factors. Out of these 219 ICSRs, 48 were exposed to NSAIDs in the second but not the third trimester or to paracetamol in the third trimester. Causality assessment was "probable or likely" in four NSAID reports and none of the paracetamol reports. Conclusions: The scarcity of adverse drug reactions (ADRs) in our study and in the literature, despite decades of pharmaceutical marketing and worldwide use of paracetamol as an analgesic of choice in the third trimester and the absence of formal contraindications against NSAIDs in the second trimester, speaks against a substantial cardiovascular and nephrotoxic risk of temporary use of NSAIDs in the second trimester or paracetamol in the third trimester. NSAIDs continue to be contraindicated in the third trimester. [ABSTRACT FROM AUTHOR]
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- 2024
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46. Functional and structural characterization of interactions between opposite subunits in HCN pacemaker channels
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Mahesh Kondapuram, Benedikt Frieg, Sezin Yüksel, Tina Schwabe, Christian Sattler, Marco Lelle, Andrea Schweinitz, Ralf Schmauder, Klaus Benndorf, Holger Gohlke, and Jana Kusch
- Subjects
Biology (General) ,QH301-705.5 - Abstract
Interactions between opposite subunits of HCN channels are relevant for stabilizing the auto-inhibited state of the channel. Like cAMP-binding, K464E-mutation breaks these interactions to favor a channel’s pre-activated state.
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- 2022
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47. Explainable AI for CNN-based prostate tumor segmentation in multi-parametric MRI correlated to whole mount histopathology
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Deepa Darshini Gunashekar, Lars Bielak, Leonard Hägele, Benedict Oerther, Matthias Benndorf, Anca-L. Grosu, Thomas Brox, Constantinos Zamboglou, and Michael Bock
- Subjects
Convolutional neural network ,Automatic prostate tumor segmentation ,Histological validation ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Automatic prostate tumor segmentation is often unable to identify the lesion even if multi-parametric MRI data is used as input, and the segmentation output is difficult to verify due to the lack of clinically established ground truth images. In this work we use an explainable deep learning model to interpret the predictions of a convolutional neural network (CNN) for prostate tumor segmentation. The CNN uses a U-Net architecture which was trained on multi-parametric MRI data from 122 patients to automatically segment the prostate gland and prostate tumor lesions. In addition, co-registered ground truth data from whole mount histopathology images were available in 15 patients that were used as a test set during CNN testing. To be able to interpret the segmentation results of the CNN, heat maps were generated using the Gradient Weighted Class Activation Map (Grad-CAM) method. The CNN achieved a mean Dice Sorensen Coefficient 0.62 and 0.31 for the prostate gland and the tumor lesions -with the radiologist drawn ground truth and 0.32 with whole-mount histology ground truth for tumor lesions. Dice Sorensen Coefficient between CNN predictions and manual segmentations from MRI and histology data were not significantly different. In the prostate the Grad-CAM heat maps could differentiate between tumor and healthy prostate tissue, which indicates that the image information in the tumor was essential for the CNN segmentation.
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- 2022
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48. TRIM4Post-Mining: Transition Information Modelling for Attractive Post-Mining Landscapes—A Conceptual Framework
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Jörg Benndorf, Diego Alejandro Restrepo, Natalie Merkel, Andre John, Mike Buxton, Adriana Guatame-Garcia, Marinus Dalm, Bob de Waard, Hernan Flores, Stefan Möllerherm, Luis Alberto Pizano Wagner, Steffen Schmidt, Andreas Knobloch, Harm Nolte, and Martin Kreßner
- Subjects
geomonitoring ,geo-sensors ,data analytics ,ground movement modelling ,geochemical modelling ,Geo-Information Systems (GIS) ,Mining engineering. Metallurgy ,TN1-997 - Abstract
TRIM4Post-Mining is a H2020/RFCS-funded project that brings together a consortium of European experts from industry and academia to develop an integrated information modelling system. This is designed to support decision making and planning during the transition from coal exploitation to a revitalized post-mining landscape, enabling infrastructure development for agricultural and industrial utilization, and contributing to the recovery of energy and materials from coal mining dumps. The smart system will be founded upon a high-resolution spatiotemporal database, utilizing state-of-the-art multi-scale and multi-sensor monitoring technologies that characterize dynamic processes in coal waste dumps related to timely, dependent deformation and geochemical processes. It will integrate efficient methods for operational and post-mining monitoring, comprehensive spatiotemporal data analytics, feature extraction, and predictive modelling; this will allow for the identification of potential contamination areas and the forecasting of geotechnical risks and ground conditions. For the interactive exploration of alternative land-use planning scenarios—in terms of residual risks, technical feasibility, environmental and social impact, and affordability—up-to-date data and models will be embedded in an interactive planning system based on Virtual Reality and Augmented Reality technology, forming a TRIM—a Transition Information Modelling System. This contribution presents the conceptual approach and main constituents, and describes the state-of-the-art and detailed anticipated methodological approach for each of the constituents. This is supported by the presentation of the first results and a discussion of future work. An anticipated second contribution will focus on the main findings, technology readiness and a discussion of future work.
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- 2022
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49. Feasibility, pitfalls and results of a structured concept-development phase for a randomized controlled phase III trial on radiotherapy in primary prostate cancer patients
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S. K. B. Spohn, S. Adebahr, M. Huber, C. Jenkner, R. Wiehle, B. Nagavci, C. Schmucker, E. G. Carl, R. C. Chen, W. A. Weber, M. Mix, A. Rühle, T. Sprave, N. H. Nicolay, C. Gratzke, M. Benndorf, T. Wiegel, J. Weis, D. Baltas, A. L. Grosu, and C. Zamboglou
- Subjects
Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Objective Failure rate in randomized controlled trials (RCTs) is > 50%, includes safety-problems, underpowered statistics, lack of efficacy, lack of funding or insufficient patient recruitment and is even more pronounced in oncology trials. We present results of a structured concept-development phase (CDP) for a phase III RCT on personalized radiotherapy (RT) in primary prostate cancer (PCa) patients implementing prostate specific membrane antigen targeting positron emission tomography (PSMA-PET). Materials and methods The 1 yr process of the CDP contained five main working packages: (i) literature search and scoping review, (ii) involvement of individual patients, patients’ representatives and patients’ self-help groups addressing the patients’ willingness to participate in the preparation process and the conduct of RCTs as well as the patient informed consent (PIC), (iii) involvement of national and international experts and expert panels (iv) a phase II pilot study investigating the safety of implementation of PSMA-PET for focal dose escalation RT and (v) in-silico RT planning studies assessing feasibility of envisaged dose regimens and effects of urethral sparing in focal dose escalation. Results (i) Systematic literature searches confirmed the high clinical relevance for more evidence on advanced RT approaches, in particular stereotactic body RT, in high-risk PCa patients. (ii) Involvement of patients, patient representatives and randomly selected males relevantly changed the PIC and initiated a patient empowerment project for training of bladder preparation. (iii) Discussion with national and international experts led to adaptions of inclusion and exclusion criteria. (iv) Fifty patients were treated in the pilot trial and in- and exclusion criteria as well as enrollment calculations were adapted accordingly. Parallel conduction of the pilot trial revealed pitfalls on practicability and broadened the horizon for translational projects. (v) In-silico planning studies confirmed feasibility of envisaged dose prescription. Despite large prostate- and boost-volumes of up to 66% of the prostate, adherence to stringent anorectal dose constraints was feasible. Urethral sparing increased the therapeutic ratio. Conclusion The dynamic framework of interdisciplinary working programs in CDPs enhances robustness of RCT protocols and may be associated with decreased failure rates. Structured recommendations are warranted to further define the process of such CDPs in radiation oncology trials.
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- 2022
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50. The Metaproteomics Initiative: a coordinated approach for propelling the functional characterization of microbiomes
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Tim Van Den Bossche, Magnus Ø. Arntzen, Dörte Becher, Dirk Benndorf, Vincent G. H. Eijsink, Céline Henry, Pratik D. Jagtap, Nico Jehmlich, Catherine Juste, Benoit J. Kunath, Bart Mesuere, Thilo Muth, Phillip B. Pope, Jana Seifert, Alessandro Tanca, Sergio Uzzau, Paul Wilmes, Robert L. Hettich, and Jean Armengaud
- Subjects
Microbiome ,Metaproteomics ,Multi-omics ,Education ,Interactions ,Networking ,Microbial ecology ,QR100-130 - Abstract
Abstract Through connecting genomic and metabolic information, metaproteomics is an essential approach for understanding how microbiomes function in space and time. The international metaproteomics community is delighted to announce the launch of the Metaproteomics Initiative (www.metaproteomics.org), the goal of which is to promote dissemination of metaproteomics fundamentals, advancements, and applications through collaborative networking in microbiome research. The Initiative aims to be the central information hub and open meeting place where newcomers and experts interact to communicate, standardize, and accelerate experimental and bioinformatic methodologies in this field. We invite the entire microbiome community to join and discuss potential synergies at the interfaces with other disciplines, and to collectively promote innovative approaches to gain deeper insights into microbiome functions and dynamics. Video Abstract.
- Published
- 2021
- Full Text
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