717 results on '"Kremser, P."'
Search Results
2. The Dsc ubiquitin ligase complex identifies transmembrane degrons to degrade orphaned proteins at the Golgi
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Yannick Weyer, Sinead I. Schwabl, Xuechen Tang, Astha Purwar, Konstantin Siegmann, Angela Ruepp, Theresia Dunzendorfer-Matt, Michael A. Widerin, Veronika Niedrist, Noa J. M. Mutsters, Maria G. Tettamanti, Sabine Weys, Bettina Sarg, Leopold Kremser, Klaus R. Liedl, Oliver Schmidt, and David Teis
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Science - Abstract
Abstract The Golgi apparatus is essential for protein sorting, yet its quality control mechanisms are poorly understood. Here we show that the Dsc ubiquitin ligase complex uses its rhomboid pseudo-protease subunit, Dsc2, to assess the hydrophobic length of α-helical transmembrane domains (TMDs) at the Golgi. Thereby the Dsc complex likely interacts with orphaned ER and Golgi proteins that have shorter TMDs and ubiquitinates them for targeted degradation. Some Dsc substrates will be extracted by Cdc48 for endosome and Golgi associated proteasomal degradation (EGAD), while others will undergo ESCRT dependent vacuolar degradation. Some substrates are degraded by both, EGAD- or ESCRT pathways. The accumulation of Dsc substrates entails a specific increase in glycerophospholipids with shorter and asymmetric fatty acyl chains. Hence, the Dsc complex mediates the selective degradation of orphaned proteins at the sorting center of cells, which prevents their spreading across other organelles and thereby preserves cellular membrane protein and lipid composition.
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- 2024
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3. The citizen science project “AmphiBiom”: a quest to mitigate habitat loss for the European green toad
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Stephan Burgstaller, Janette Siebert, Maria M. Krall, Yurii V. Kornilev, Magdalena Spießberger, David Hamernik, Janis Kremser, Thomas Ofenböck, Johann G. Zaller, Silke Schweiger, Wolfram Graf, Daniel Dörler, Florian Heigl, and Lukas Landler
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AmphiApp ,amphibian ,aquatic invertebrates ,breedi ,Science - Abstract
We aim to understand the distribution and environmental drivers for the occurrence of the European green toad (Bufotes viridis) in Austria and create breeding habitats for it. Citizen scientists can use a custom smartphone application (AmphiApp) to record data such as the calls of anurans and photographic documentation. The records are validated by experts. To provide breeding habitats for green toads, we gave citizen scientists 300 small plastic ponds (1.20L × 0.9W × 0.4D m) to place on their land (garden, backyard). These citizen scientists will monitor their pond every two weeks for two seasons (March–August 2024 & 2025) for the occurrence of amphibians and their invertebrate prey. During the first two months, most pond owners have been highly motivated and have followed the monitoring scheme, despite the involved procedure, likely due to our active engagement with them (e.g., during the pond delivery by team members, emails, phone calls and messaging within AmphiApp).
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- 2024
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4. Error correcting 2D-3D cascaded network for myocardial infarct scar segmentation on late gadolinium enhancement cardiac magnetic resonance images
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Schwab, Matthias, Pamminger, Mathias, Kremser, Christian, Obmann, Daniel, Haltmeier, Markus, and Mayr, Agnes
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Electrical Engineering and Systems Science - Image and Video Processing ,Computer Science - Computer Vision and Pattern Recognition - Abstract
Late gadolinium enhancement (LGE) cardiac magnetic resonance (CMR) imaging is considered the in vivo reference standard for assessing infarct size (IS) and microvascular obstruction (MVO) in ST-elevation myocardial infarction (STEMI) patients. However, the exact quantification of those markers of myocardial infarct severity remains challenging and very time-consuming. As LGE distribution patterns can be quite complex and hard to delineate from the blood pool or epicardial fat, automatic segmentation of LGE CMR images is challenging. In this work, we propose a cascaded framework of two-dimensional and three-dimensional convolutional neural networks (CNNs) which enables to calculate the extent of myocardial infarction in a fully automated way. By artificially generating segmentation errors which are characteristic for 2D CNNs during training of the cascaded framework we are enforcing the detection and correction of 2D segmentation errors and hence improve the segmentation accuracy of the entire method. The proposed method was trained and evaluated in a five-fold cross validation using the training dataset from the EMIDEC challenge. We perform comparative experiments where our framework outperforms state-of-the-art methods of the EMIDEC challenge, as well as 2D and 3D nnU-Net. Furthermore, in extensive ablation studies we show the advantages that come with the proposed error correcting cascaded method.
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- 2023
5. The Dsc ubiquitin ligase complex identifies transmembrane degrons to degrade orphaned proteins at the Golgi
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Weyer, Yannick, Schwabl, Sinead I., Tang, Xuechen, Purwar, Astha, Siegmann, Konstantin, Ruepp, Angela, Dunzendorfer-Matt, Theresia, Widerin, Michael A., Niedrist, Veronika, Mutsters, Noa J. M., Tettamanti, Maria G., Weys, Sabine, Sarg, Bettina, Kremser, Leopold, Liedl, Klaus R., Schmidt, Oliver, and Teis, David
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- 2024
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6. Process science: the interdisciplinary study of socio-technical change
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Brocke, Jan vom, van der Aalst, Wil M. P., Berente, Nicholas, van Dongen, Boudewijn, Grisold, Thomas, Kremser, Waldemar, Mendling, Jan, Pentland, Brian T., Roeglinger, Maximilian, Rosemann, Michael, and Weber, Barbara
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- 2024
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7. Integrative multi-region molecular profiling of primary prostate cancer in men with synchronous lymph node metastasis
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Singhal, Udit, Nallandhighal, Srinivas, Tosoian, Jeffrey J., Hu, Kevin, Pham, Trinh M., Stangl-Kremser, Judith, Liu, Chia-Jen, Karim, Razeen, Plouffe, Komal R., Morgan, Todd M., Cieslik, Marcin, Lucianò, Roberta, Shariat, Shahrokh F., Finocchio, Nadia, Dambrosio, Lucia, Doglioni, Claudio, Chinnaiyan, Arul M., Tomlins, Scott A., Briganti, Alberto, Palapattu, Ganesh S., Udager, Aaron M., and Salami, Simpa S.
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- 2024
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8. Phosphorylation of the compartmentalized PKA substrate TAF15 regulates RNA–protein interactions
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Feichtner, Andreas, Enzler, Florian, Kugler, Valentina, Hoppe, Katharina, Mair, Sophia, Kremser, Leopold, Lindner, Herbert, Huber, Roland G., Stelzl, Ulrich, Stefan, Eduard, and Torres-Quesada, Omar
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- 2024
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9. Coherent Dynamics of the Swing-Up Excitation Technique
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Boos, Katarina, Sbresny, Friedrich, Kim, Sang Kyu, Kremser, Malte, Riedl, Hubert, Bopp, Frederik W., Rauhaus, William, Scaparra, Bianca, Jöns, Klaus D., Finley, Jonathan J., Müller, Kai, and Hanschke, Lukas
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Quantum Physics ,Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
Developing coherent excitation methods for quantum emitters which enable high brightness, good single-photon purity and high indistinguishability of the emitted photons has been a key challenge in the past years. While many methods have been proposed and explored, they all have specific advantages and disadvantages. In this letter, we investigate the dynamics of the recent swing-up scheme as an excitation method for a two-level system and its performance in single-photon generation. By applying two far red-detuned laser pulses, the two-level system can be prepared in the excited state with near-unity fidelity. We demonstrate the successful functionality and the coherent character of this technique using semiconductor quantum dots. Moreover, we explore the multi-dimensional parameter space of the two laser pulses to study the impact on the excitation fidelity. Finally, we investigate the performance of the scheme as an excitation method for generation of high-quality single photons. We find that the swing-up scheme itself works well and exhibits nearly perfect single-photon purity, while the observed indistinguishability in our sample is limited by the influence of the inevitable high excitation powers on the semiconductor environment of the quantum dot., Comment: 11 pages, 11 figures
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- 2022
10. Twist-dependent intra- and interlayer excitons in moire MoSe2 homobilayers
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Villafañe, Viviana, Kremser, Malte, Hübner, Ruven, Petrić, Marko M., Wilson, Nathan P., Stier, Andreas V., Müller, Kai, Florian, Matthias, Steinhoff, Alexander, and Finley, Jonathan J.
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Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Other Condensed Matter - Abstract
Optoelectronic properties of van der Waals homostructures can be selectively engineered by the relative twist angle between layers. Here, we study the twist-dependent moire coupling in MoSe2 homobilayers. For small angles, we find a pronounced redshift of the K-K and {\Gamma}-K excitons accompanied by a transition from K-K to {\Gamma}-K emission. Both effects can be traced back to the underlying moire pattern in the MoSe2 homobilayers, as confirmed by our low-energy continuum model for different moire excitons. We identify two distinct intralayer moire excitons for R-stacking, while H-stacking yields two degenerate intralayer excitons due to inversion symmetry. In both cases, bright interlayer excitons are found at higher energies. The performed calculations are in excellent agreement with experiment and allow us to characterize the observed exciton resonances, providing insight about the layer composition and relevant stacking configuration of different moire exciton species.
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- 2022
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11. Towards a digital twin of a holacratic organization: a point of view on Lyytinen et al. (2023)
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Winkler, Johannes and Kremser, Waldemar
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- 2024
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12. Bioleaching metal-bearing wastes and by-products for resource recovery: a review
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Tezyapar Kara, I., Kremser, K., Wagland, S. T., and Coulon, F.
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- 2023
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13. Integrative multi-region molecular profiling of primary prostate cancer in men with synchronous lymph node metastasis
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Udit Singhal, Srinivas Nallandhighal, Jeffrey J. Tosoian, Kevin Hu, Trinh M. Pham, Judith Stangl-Kremser, Chia-Jen Liu, Razeen Karim, Komal R. Plouffe, Todd M. Morgan, Marcin Cieslik, Roberta Lucianò, Shahrokh F. Shariat, Nadia Finocchio, Lucia Dambrosio, Claudio Doglioni, Arul M. Chinnaiyan, Scott A. Tomlins, Alberto Briganti, Ganesh S. Palapattu, Aaron M. Udager, and Simpa S. Salami
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Science - Abstract
Abstract Localized prostate cancer is frequently composed of multiple spatially distinct tumors with significant inter- and intra-tumoral molecular heterogeneity. This genomic diversity gives rise to many competing clones that may drive the biological trajectory of the disease. Previous large-scale sequencing efforts have focused on the evolutionary process in metastatic prostate cancer, revealing a potential clonal progression to castration resistance. However, the clonal origin of synchronous lymph node (LN) metastases in primary disease is still unknown. Here, we perform multi-region, targeted next generation sequencing and construct phylogenetic trees in men with prostate cancer with synchronous LN metastasis to better define the pathologic and molecular features of primary disease most likely to spread to the LNs. Collectively, we demonstrate that a combination of histopathologic and molecular factors, including tumor grade, presence of extra-prostatic extension, cellular morphology, and oncogenic genomic alterations are associated with synchronous LN metastasis.
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- 2024
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14. Robust boundary formation in a morphogen gradient via cell-cell signaling
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Bojer, Mareike, Kremser, Stephan, and Gerland, Ulrich
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Physics - Biological Physics - Abstract
Establishing sharp and correctly positioned boundaries in spatial gene expression patterns is a central task, both in developmental and synthetic biology. We consider situations where a global morphogen gradient provides positional information to cells, but is insufficient to ensure the required boundary precision, due to different types of noise in the system. In a conceptual model, we quantitatively compare three mechanisms, which combine the global signal with local signaling between neighboring cells, to enhance the boundary formation process. These mechanisms differ with respect to the way in which they combine the signals, by following either an AND, an OR, or a SUM rule. Within our model, we analyze the dynamics of the boundary formation process, and the fuzziness of the resulting boundary. Furthermore, we consider the tunability of the boundary position, and its scaling with system size. We nd that all three mechanisms produce less fuzzy boundaries than the purely gradient-based reference mechanism, even in the regime of high noise in the local signals relative to the noise in the global signal. Among the three mechanisms, the SUM rule produces the most accurate boundary. However, in contrast to the other two mechanisms, it requires noise to exit metastable states and rapidly reach the stable boundary pattern.
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- 2022
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15. Longitudinal evaluation of manufacturer-specific differences for high-sensitive CRP EQA results
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Nathalie Weiss, Laura Vierbaum, Marcel Kremser, Anne Kaufmann-Stoeck, Silke Kappler, Silvia Ballert, Kathrin Kabrodt, Klaus-Peter Hunfeld, and Ingo Schellenberg
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hsCRP ,external quality assessment scheme (EQA) ,proficiency testing (PT) ,harmonization ,cardiovascular diseases ,Biology (General) ,QH301-705.5 - Abstract
BackgroundC-reactive protein (CRP) is an established serum biomarker for different pathologies such as tissue injury and inflammatory events. One rising area of interest is the incorporation of low concentrations of CRP, so called high-sensitive (hs-) CRP, in the risk assessment and treatment monitoring of cardiovascular diseases (CVDs). Many research projects and the resulting meta-analyses have reported controversial results for the use of hs-CRP, especially in the risk assessment of CVDs. However, since these analyses used different assays to detect hs-CRP, it is important to assess the current level of assay harmonization.MethodsThis paper analyzes data from 17 external quality assessment (EQA) surveys for hs-CRP conducted worldwide between 2018 and 2023. Each EQA survey consisted of two blinded samples. In 2020 the sample material changed from pooled serum to single-donor samples. The aim was to assess the current status of assay harmonization by a manufacturer-based approach, taking into consideration the clinical decision limits for hs-CRP risk-stratification of CVDs as well as the scatter of results.ResultsOur analyses show that harmonization has increased in recent years from median differences of up to 50% to below 20%, with one exception that showed an increasing bias throughout the observed period. After changing sample materials from pools to single-donor samples, the coefficient of variation decreased to below 10% with one exception. Nevertheless, even these differences in the clinical setting could lead to disparate classification of patients depending on the assay used.ConclusionWhile there was a positive trend towards harmonization, meta-analysis of different risk-score publications should stratify their analysis by assay to account for the manufacturer-specific differences observed in this paper. Furthermore, assays are currently traceable to different international standard preparations, which might have a negative impact on future harmonization.
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- 2024
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16. Longitudinal evaluation of external quality assessment results for CA 15-3, CA 19-9, and CA 125
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Marcel Kremser, Nathalie Weiss, Anne Kaufmann-Stoeck, Laura Vierbaum, Arthur Schmitz, Ingo Schellenberg, and Stefan Holdenrieder
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external quality assessment ,tumor marker ,cancer antigen ,CA 15-3 ,CA 19-9 ,CA 125 ,Biology (General) ,QH301-705.5 - Abstract
BackgroundTumor markers are established laboratory tools that help to diagnose, estimate prognosis, and monitor the course of cancer. For meaningful decision-making in patient care, it is essential that methods and analytical platforms demonstrate high sensitivity, specificity, precision, and comparability. Regular participation at external quality assessment (EQA) schemes is mandatory for laboratories. Here, a longitudinal evaluation of EQA data was performed to assess the performance of tumor marker assays over time.MethodsLongitudinal data of the cancer antigens (CA) 15-3 (n = 5,492), CA 19-9 (n = 6,802), and CA 125 (n = 5,362) from 14 INSTAND EQAs conducted between 2019 and 2023 were evaluated. A median of 197, 244 and 191 laboratories participated at the EQAs for CA 15-3, CA 19-9 and CA 125, respectively. Data evaluation encompasses intra- and inter-manufacturer specific variations over time, assay precision, and adherence to the EQA limits of ±24% for CA 15-3, ±27% for CA 19–9 and ±36% for CA 125.ResultsThe study showed median manufacturer-dependent differences of up to 107% for CA 15-3, 99% for CA 125, and even 549% for CA 19-9 between the highest and the lowest methods over the studied period. Regarding the normalized median of all methods, the values of the most deviant methods were 0.42 for CA 15-3, 7.61 for CA 19-9, and 1.82 for CA 125. Intra-manufacturer variability was generally low, with median coefficients of variation (CV) below 10%. As the methods were evaluated according to method-specific consensus values, most participants passed the EQAs within the acceptance criteria. When the criteria were consistently set at 24%, the central 90% of participants passed the EQAs in 78.6%–100% for CA 15-3 (with exception of AX), 89.3%–100% for CA 125, and 64.3%–100% for CA 19-9.ConclusionWhile intra-method precision of most analytical platforms is acceptable for all three tumor markers, considerable inter-method variability was observed over the whole studied period demonstrating the necessity for better standardization and harmonization of the methods, development of international reference materials, and comprehensive commutability studies with patient samples.
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- 2024
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17. The Framework DiKoLAN (Digital Competencies for Teaching in Science Education) as Basis for the Self-Assessment Tool DiKoLAN-Grid
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von Kotzebue, Lena, Meier, Monique, Finger, Alexander, Kremser, Erik, Huwer, Johannes, Thoms, Lars-Jochen, Becker, Sebastian, Bruckermann, Till, and Thyssen, Christoph
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For the planning and implementation of lessons with digital technologies, a subject-specific technology-related professional competence of teachers is of central importance. However, the competency frameworks developed so far remain in a general perspective and do not explicitly address subject-specific issues. Furthermore, digital competencies are predominantly measured with subject-unspecific self-assessment instruments, as subject-specific operationalizations for this area are not yet available in a differentiated form. In this article, the framework for Digital Competencies for Teaching in Science Education (DiKoLAN), a subject-specific framework for pre-service science teachers, is introduced, on the one hand, and, on the other hand, first results of a self-assessment tool based on the framework are described. DiKoLAN defines competency areas highly specific to science, as well as more general competency areas that include aspects common to all subjects. Each competency area is described by competency expectations, which, in turn, are structured with reference to the four technology-related dimensions of the TPACK framework (i.e., Technological and Pedagogical Content Knowledge) and three levels of performance (Name, Describe, Use/Apply). Derived from DiKoLAN, a corresponding self-assessment instrument (DiKoLAN-Grid) was developed and empirically tested for the two competency areas, (n = 118) and Information Search and Evaluation (n = 90), in biology student teachers. By means of path models, tendencies regarding structural correlations of the four components Special Tools (TK), Content-specific Context (TCK), Methods and Digitality (TPK), and Teaching (TPACK) are presented for both competency areas and discussed, as well as in comparison to previously conducted, subject-unspecific surveys.
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- 2021
18. Two-dimensional single crystal monoclinic gallium telluride on silicon substrate via transformation of epitaxial hexagonal phase
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Zallo, Eugenio, Pianetti, Andrea, Prikhodko, Alexander S., Cecchi, Stefano, Zaytseva, Yuliya S., Giuliani, Alessandro, Kremser, Malte, Borgardt, Nikolai I., Finley, Jonathan J., Arciprete, Fabrizio, Palummo, Maurizia, Pulci, Olivia, and Calarco, Raffaella
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- 2023
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19. Functional aortic valve area differs significantly between sexes: A phase-contrast cardiac MRI study in patients with severe aortic stenosis
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Felix Troger, Christian Kremser, Mathias Pamminger, Sebastian J Reinstadler, Gudrun C Thurner, Benjamin Henninger, Gert Klug, Bernhard Metzler, and Agnes Mayr
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Aortic Stenosis ,Cardiovascular MRI ,Sex Differences ,Phase-Contrast MRI ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: Aortic stenosis (AS) is one of the most prevalent valvular heart-diseases in Europe. Currently, diagnosis and classification are not sex-sensitive; however, due to a distinctly different natural history of AS, further investigations of sex-differences in AS-patients are needed. Thus, this study aimed to detect sex-differences in severe AS, especially concerning flow-patterns, via phase-contrast cardiac magnetic resonance imaging (PC-CMR). Methods: Forty-four severe AS-patients (20 women, 45 % vs. 24 men, 55 %) with a median age of 72 years underwent transthoracic echocardiography (TTE), cardiac catheterization (CC) and CMR. Aortic valve area (AVA) and stroke volume (SV) were determined in all modalities, with CMR yielding geometrical AVA via cine-planimetry and functional AVA via PC-CMR, the latter being also used to examine flow-properties. Results: Geometrical AVA showed no sex-differences (0.91 cm2, IQR: 0.61–1.14 vs. 0.94 cm2, IQR: 0.77–1.22, p = 0.322). However, functional AVA differed significantly between sexes in all three modalities (TTE: p = 0.044; CC/PC-CMR: p
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- 2024
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20. Longitudinal analysis of 20 Years of external quality assurance schemes for PCR/NAAT-based bacterial genome detection in diagnostic testing
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Marcel Kremser, Nathalie Weiss, Anne Kaufmann-Stoeck, Laura Vierbaum, Silke Kappler, Ingo Schellenberg, Andreas Hiergeist, Volker Fingerle, Michael Baier, and Udo Reischl
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EQA ,Borrelia burgdorferi ,MRSA ,INSTAND ,diagnostic molecular pathology ,Biology (General) ,QH301-705.5 - Abstract
Background:Quality control (QC), quality assurance, and standardization are crucial for modern diagnostic testing in the field of medical microbiology. The need for efficient QC to ensure accurate laboratory results, treatment, and infection prevention has led to significant efforts in standardizing assay reagents and workflows. External quality assessment (EQA) schemes, like those offered by INSTAND, play a vital role in evaluating in-house and commercial routine diagnostic assays, regarded as mandatory by national and global guidelines. The recent impact of polymerase chain reaction/nucleic acid amplification technology (PCR/NAAT) assays in medical microbiology requires that high-performing assays be distinguished from inadequately performing ones, especially those made by inexperienced suppliers.Objectives:The study assesses the evolving diagnostic performance trends over 2 decades for the detection of EHEC/STEC, Borrelia (B.) burgdorferi, and MRSA/cMRSA. It explores the historical context of assay utilization, participant engagement, and rates of correct results in EQA schemes. The research seeks to identify patterns in assay preferences, participant proficiency, and the challenges encountered in detecting emerging variants or clinical strains.Results:The study highlights the decline in in-house PCR assay usage, the emergence of new diagnostic challenges, and educational aspects within EQA schemes. Specific examples, such as the inclusion, in certain EQA surveys, of EHEC strains carrying stx-2f or B. miyamotoi, highlight the role of EQAs in increasing awareness and diagnostic capabilities. Advancements in MRSA detection, especially through the adoption of commercial assays, demonstrate the impact that technology evolution has had on diagnostic performance.Conclusion:Achieving excellence in diagnostic molecular microbiology involves a multifaceted approach, including well-evaluated assays, careful instrumentation selection, and structured training programs. EQA schemes contribute significantly to this pursuit by providing insights into the evolving diagnostic landscape and identifying areas for improvement in the diagnostic workflow as well as in PCR/NAAT assay design.
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- 2024
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21. Spent brewer’s yeast as a selective biosorbent for metal recovery from polymetallic waste streams
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Anna Sieber, Leon Robert Jelic, Klemens Kremser, and Georg M. Guebitz
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biosorption ,brewer’s yeast ,low-cost biosorbent ,selective metal recovery ,printed circuit board leachate solutions ,Biotechnology ,TP248.13-248.65 - Abstract
While the amount of electronic waste is increasing worldwide, the heterogeneity of electronic scrap makes the recycling very complicated. Hydrometallurgical methods are currently applied in e-waste recycling which tend to generate complex polymetallic solutions due to dissolution of all metal components. Although biosorption has previously been described as a viable option for metal recovery and removal from low-concentration or single-metal solutions, information about the application of selective metal biosorption from polymetallic solutions is missing. In this study, an environmentally friendly and selective biosorption approach, based on the pH-dependency of metal sorption processes is presented using spent brewer’s yeast to efficiently recover metals like aluminum, copper, zinc and nickel out of polymetallic solutions. Therefore, a design of experiment (DoE) approach was used to identify the effects of pH, metal, and biomass concentration, and optimize the biosorption efficiency for each individual metal. After process optimization with single-metal solutions, biosorption experiments with lyophilized waste yeast biomass were performed with synthetic polymetallic solutions where over 50% of aluminum at pH 3.5, over 40% of copper at pH 5.0 and over 70% of zinc at pH 7.5 could be removed. Moreover, more than 50% of copper at pH 3.5 and over 90% of zinc at pH 7.5 were recovered from a real polymetallic waste stream after leaching of printed-circuit boards. The reusability of yeast biomass was confirmed in five consecutive biosorption steps with little loss in metal recovery abilities. This proves that spent brewer’s yeast can be sustainably used to selectively recover metals from polymetallic waste streams different to previously reported studies.
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- 2024
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22. Editorial: Modern management options for solid waste and by-products: sustainable treatment and environmental benefits
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Valerio Funari, Maria Chiara Dalconi, Sebastien Farnaud, Javed Nawab, Neha Gupta, Krishna Kumar Yadav, Klemens Kremser, and Simone Toller
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resource and energy efficiency ,wastewater (WW) ,compostable and organics ,municipal solid waste incineration (MSWI) ash ,plastics ,legacy waste ,Environmental sciences ,GE1-350 - Published
- 2024
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23. Tuning the Optical Properties of an MoSe$_2$ Monolayer Using Nanoscale Plasmonic Antennas
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Petrić, Marko M., Kremser, Malte, Barbone, Matteo, Nolinder, Anna, Lyamkina, Anna, Stier, Andreas V., Kaniber, Michael, Müller, Kai, and Finley, Jonathan J.
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Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Materials Science ,Physics - Optics - Abstract
Nanoplasmonic systems combined with optically-active two-dimensional materials provide intriguing opportunities to explore and control light-matter interactions at extreme sub-wavelength lengthscales approaching the exciton Bohr radius. Here, we present room- and cryogenic-temperature investigations of light-matter interactions between an MoSe$_2$ monolayer and individual lithographically defined gold dipole nanoantennas having sub-10 nm feed gaps. By progressively tuning the nanoantenna size, their dipolar resonance is tuned relative to the A-exciton transition in a proximal MoSe$_2$ monolayer achieving a total tuning of $\sim 130\;\mathrm{meV}$. Differential reflectance measurements performed on $> 100$ structures reveal an apparent avoided crossing between exciton and dipolar mode and an exciton-plasmon coupling constant of $g= 55\;\mathrm{meV}$, representing $g/(\hbar\omega_X)\geq3\%$ of the transition energy. This places our hybrid system in the intermediate-coupling regime where spectra exhibit a characteristic Fano-like shape, indicative of the interplay between pronounced light-matter coupling and significant damping. We also demonstrate active control of the optical response by varying the polarization of the excitation light to programmably suppress coupling to the dipole mode. We further study the emerging optical signatures of the monolayer localized at dipole nanoantennas at $10\;\mathrm{K}$. Our findings represent a key step towards realizing non-linear photonic devices based on 2D materials with potential for low-energy and ultrafast performance., Comment: 17 pages, 12 figures, https://pubs.acs.org/doi/10.1021/acs.nanolett.1c02676
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- 2021
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24. 1.5-T MR relaxometry in quantifying splenic and pancreatic iron: retrospective comparison of a commercial 3D-Dixon sequence and an established 2D multi-gradient echo sequence
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Plaikner, Michaela, Lanser, Lukas, Kremser, Christian, Weiss, Günter, and Henninger, Benjamin
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- 2023
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25. Correction: Towards a digital twin of a holacratic organization: a point of view on Lyytinen et al. (2023)
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Winkler, Johannes and Kremser, Waldemar
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- 2024
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26. Empagliflozin protects mice against diet-induced obesity, insulin resistance and hepatic steatosis
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Radlinger, Bernhard, Ress, Claudia, Folie, Sabrina, Salzmann, Karin, Lechuga, Ana, Weiss, Bernhard, Salvenmoser, Willi, Graber, Michael, Hirsch, Jakob, Holfeld, Johannes, Kremser, Christian, Moser, Patrizia, Staudacher, Gabriele, Jelenik, Tomas, Roden, Michael, Tilg, Herbert, and Kaser, Susanne
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- 2023
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27. Partial-gland Cryoablation Outcomes for Localized Prostate Cancer in Patients with Magnetic Resonance Imaging (MRI)-visible and MRI-invisible Lesions
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Alec Zhu, Sofia Gereta, Tenny R. Zhang, Judith Stangl-Kremser, Richard M. Mora, Daniel J.A. Margolis, and Jim C. Hu
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Prostatic neoplasms ,Cryosurgery ,Treatment failure ,Diseases of the genitourinary system. Urology ,RC870-923 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Background: Expert consensus recommends treatment of magnetic resonance imaging (MRI)-visible prostate cancer (PCa). Outcomes of partial-gland ablation (PGA) for MRI-invisible PCa remain unknown. Objective: To compare recurrence-free survival, adverse events, and health-related quality of life (HRQoL) outcomes following cryoablation of MRI-visible vs invisible PCa. Design, setting, and participants: We analyzed data for 75 men who underwent cryoablation therapy between January 2017 and January 2022. PCa identified on MRI-targeted and/or adjacent systematic biopsy cores was defined as MRI-visible, whereas PCa identified on systematic biopsy beyond the targeted zone was defined as MRI-invisible. Outcome measurements and statistical analysis: The primary outcome was recurrence at 12 mo after PGA, defined as the presence of clinically significant PCa (grade group [GG] ≥2) on surveillance biopsy. Adverse events were captured using the Clavien-Dindo classification and HRQoL was captured using the Expanded Prostate Cancer Index-Clinical Practice (EPIC-CP) tool. Results and limitations: Of the 58 men treated for MRI-visible and 17 treated for MRI-invisible lesions, 51 (88%) and 16 (94%), respectively, had at least one surveillance biopsy performed. There were no statistically significant differences in age, race, body mass index, biopsy GG, prostate-specific antigen, prostate volume, or treatment extent between the MRI-visible and MRI-invisible groups. Median follow-up was 44 mo (interquartile range 17–54) and did not significantly differ between the groups. The recurrence rate at 12 mo did not significantly differ between the groups (MRI-visible 39%, MRI-invisible 19%; p = 0.2), and log-rank survival analysis demonstrated no significant difference in recurrence-free survival (p = 0.15). Adverse event rates did not significantly differ (MRI-visible 29%, MRI-invisible 53%; p = 0.092); no man in the MRI-visible group had a Clavien-Dindo grade ≥III complication, while one subject in the MRI-invisible group had a Clavien-Dindo grade III complication. Median EPIC-CP urinary and sexual function scores were similar for the two groups at baseline and at 12 mo after PGA. Study limitations include the retrospective design and small sample size. Conclusions: We observed similar cancer control, adverse event, and HRQoL outcomes for MRI-visible versus MRI-invisible PCa in the first comparison of partial-gland cryoablation. Longer follow-up and external validation of our findings are needed to inform patient selection for PGA for MRI-invisible PCa. Patient summary: Patients with prostate cancer lesions that are not visible on magnetic resonance imaging (MRI) scans who undergo partial gland ablation may have similar treatment outcomes compared to patients with cancer lesions that are visible on MRI.
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- 2023
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28. Association of dysglycaemia with persistent infarct core iron in patients with acute ST-segment elevation myocardial infarction
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Ivan Lechner, Martin Reindl, Fritz Oberhollenzer, Christina Tiller, Magdalena Holzknecht, Priscilla Fink, Thomas Kremser, Paolo Bonatti, Felix Troger, Benjamin Henninger, Agnes Mayr, Axel Bauer, Bernhard Metzler, and Sebastian J. Reinstadler
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ST-elevation myocardial infarction ,HbA1c ,Intramyocardial hemorrhage ,Persistent iron ,Iron resolution, Cardiac magnetic resonance imaging ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: Dysglycaemia increases the risk of myocardial infarction and subsequent recurrent cardiovascular events. However, the role of dysglycaemia in ischemia/reperfusion injury with development of irreversible myocardial tissue alterations remains poorly understood.In this study we aimed to investigate the association of ongoing dysglycaemia with persistence of infarct core iron and their longitudinal changes over time in patients undergoing primary percutaneous coronary intervention (PCI) for acute ST-segment elevation myocardial infarction (STEMI). Methods: We analyzed 348 STEMI patients treated with primary PCI between 2016 and 2021 that were included in the prospective MARINA-STEMI study (NCT04113356). Peripheral venous blood samples for glucose and glycated hemoglobin (HbA1c) measurements were drawn on admission and 4 months after STEMI. Cardiac magnetic resonance (CMR) imaging including T2 * mapping for infarct core iron assessment was performed at both time points. Associations of dysglycaemia with persistent infarct core iron and iron resolution at 4 months were calculated using multivariable regression analysis. Results: Intramyocardial hemorrhage was observed in 147 (42%) patients at baseline. Of these, 89 (61%) had persistent infarct core iron 4 months after infarction with increasing rates across HbA1c levels (
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- 2024
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29. Longitudinal analysis of external quality assessment of immunoassay-based steroid hormone measurement indicates potential for improvement in standardization
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Laura Vierbaum, Nathalie Weiss, Patricia Kaiser, Marcel Kremser, Folker Wenzel, Mario Thevis, Ingo Schellenberg, and Peter B. Luppa
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external quality assessment (EQA) ,proficiency testing (PT) ,steroid hormones ,immunoassays ,accuracy ,standardization ,Biology (General) ,QH301-705.5 - Abstract
As hormonal disorders are linked to several diseases, the accurate quantitation of steroid hormone levels in serum is crucial in order to provide patients with a reliable diagnosis. Mass spectrometry-based methods are regarded as having the highest level of specificity and sensitivity. However, immunoassays are more commonly used in routine diagnostics to measure steroid levels as they are more cost effective and straightforward to conduct. This study analyzes the external quality assessment results for the measurement of testosterone, progesterone and 17β-estradiol in serum using immunoassays between early 2020 and May 2022. As reference measurement procedures are available for the three steroid hormones, the manufacturer-specific biases were normalized to the reference measurement values. The manufacturer-specific coefficients of variation were predominantly inconspicuous, below 20% for the three hormones when outliers are disregarded, however there were large differences between the various manufacturer collectives. For some collectives, the median bias to the respective reference measurement value was repeatedly greater than ±35%, which is the acceptance limit defined by the German Medical Association. In the case of testosterone and progesterone determination, some collectives tended to consistently over- or underestimate analyte concentrations compared to the reference measurement value, however, for 17β-estradiol determination, both positive and negative biases were observed. This insufficient level of accuracy suggests that cross-reactivity continues to be a fundamental challenge when antibody detection is used to quantify steroids with a high structural similarity. Distinct improvements in standardization are required to provide accurate analysis and thus, reliable clinical interpretations. The increased accuracy of the AX immunoassay for testosterone measurement, as observed in the INSTAND EQAs between 2020 and 2022, could be the result of a recalibration of the assay and raises hope for further improvement of standardization of immunoassay-based steroid hormone analyses in the coming years.
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- 2024
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30. Metal recovery from spent lithium-ion batteries via two-step bioleaching using adapted chemolithotrophs from an acidic mine pit lake
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Lalropuia Lalropuia, Jiri Kucera, Wadih Y. Rassy, Eva Pakostova, Dominik Schild, Martin Mandl, Klemens Kremser, and Georg M. Guebitz
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acidic mine pit lake ,bacterial adaptation ,bioleaching ,black mass ,lithium-ion batteries ,metal recovery ,Microbiology ,QR1-502 - Abstract
The demand for lithium-ion batteries (LIBs) has dramatically increased in recent years due to their application in various electronic devices and electric vehicles (EVs). Great amount of LIB waste is generated, most of which ends up in landfills. LIB wastes contain substantial amounts of critical metals (such as Li, Co, Ni, Mn, and Cu) and can therefore serve as valuable secondary sources of these metals. Metal recovery from the black mass (shredded spent LIBs) can be achieved via bioleaching, a microbiology-based technology that is considered to be environmentally friendly, due to its lower costs and energy consumption compared to conventional pyrometallurgy or hydrometallurgy. However, the growth and metabolism of bioleaching microorganisms can be inhibited by dissolved metals. In this study, the indigenous acidophilic chemolithotrophs in a sediment from a highly acidic and metal-contaminated mine pit lake were enriched in a selective medium containing iron, sulfur, or both electron donors. The enriched culture with the highest growth and oxidation rate and the lowest microbial diversity (dominated by Acidithiobacillus and Alicyclobacillus spp. utilizing both electron donors) was then gradually adapted to increasing concentrations of Li+, Co2+, Ni2+, Mn2+, and Cu2+. Finally, up to 100% recovery rates of Li, Co, Ni, Mn, and Al were achieved via two-step bioleaching using the adapted culture, resulting in more effective metal extraction compared to bioleaching with a non-adapted culture and abiotic control.
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- 2024
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31. Complement C7 and clusterin form a complex in circulation
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Mariam Massri, Erik J.M. Toonen, Bettina Sarg, Leopold Kremser, Marco Grasse, Verena Fleischer, Omar Torres-Quesada, Ludger Hengst, Mikkel-Ole Skjoedt, Rafael Bayarri-Olmos, Anne Rosbjerg, Peter Garred, Dorothea Orth-Höller, Zoltán Prohászka, and Reinhard Würzner
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complement C7 ,clusterin ,complex ,complement ,circulation ,Immunologic diseases. Allergy ,RC581-607 - Abstract
IntroductionThe complement system is part of innate immunity and is comprised of an intricate network of proteins that are vital for host defense and host homeostasis. A distinct mechanism by which complement defends against invading pathogens is through the membrane attack complex (MAC), a lytic structure that forms on target surfaces. The MAC is made up of several complement components, and one indispensable component of the MAC is C7. The role of C7 in MAC assembly is well documented, however, inherent characteristics of C7 are yet to be investigated.MethodsTo shed light on the molecular characteristics of C7, we examined the properties of serum-purified C7 acquired using polyclonal and novel monoclonal antibodies. The properties of serum‑purified C7 were investigated through a series of proteolytic analyses, encompassing Western blot and mass spectrometry. The nature of C7 protein-protein interactions were further examined by a novel enzyme-linked immunosorbent assay (ELISA), as well as size‑exclusion chromatography. ResultsProtein analyses showcased an association between C7 and clusterin, an inhibitory complement regulator. The distinct association between C7 and clusterin was also demonstrated in serum-purified clusterin. Further assessment revealed that a complex between C7 and clusterin (C7-CLU) was detected. The C7-CLU complex was also identified in healthy serum and plasma donors, highlighting the presence of the complex in circulation. DiscussionClusterin is known to dissociate the MAC structure by binding to polymerized C9, nevertheless, here we show clusterin binding to the native form of a terminal complement protein in vivo. The presented data reveal that C7 exhibits characteristics beyond that of MAC assembly, instigating further investigation of the effector role that the C7-CLU complex plays in the complement cascade.
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- 2024
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32. High-resolution spectroscopy of a quantum dot driven bichromatically by two strong coherent fields
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Gustin, Chris, Hanschke, Lukas, Boos, Katarina, Müller, Jonathan R. A., Kremser, Malte, Finley, Jonathan J., Hughes, Stephen, and Müller, Kai
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Quantum Physics ,Physics - Optics - Abstract
We present spectroscopic experiments and theory of a quantum dot driven bichromatically by two strong coherent lasers. In particular, we explore the regime where the drive strengths are substantial enough to merit a general non-perturbative analysis, resulting in a rich higher-order Floquet dressed-state energy structure. We show high resolution spectroscopy measurements with a variety of laser detunings performed on a single InGaAs quantum dot, with the resulting features well explained with a time-dependent quantum master equation and Floquet analysis. Notably, driving the quantum dot resonance and one of the subsequent Mollow triplet sidepeaks, we observe the disappearance and subsequent reappearance of the central transition and transition resonant with detuned-laser at high detuned-laser pump strengths and additional higher-order effects, e.g. emission triplets at higher harmonics and signatures of higher order Floquet states. For a similar excitation condition but with an off-resonant primary laser, we observe similar spectral features but with an enhanced inherent spectral asymmetry.
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- 2020
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33. Raman spectrum of Janus transition metal dichalcogenide monolayers WSSe and MoSSe
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Petrić, Marko M., Kremser, Malte, Barbone, Matteo, Qin, Ying, Sayyad, Yasir, Shen, Yuxia, Tongay, Sefaattin, Finley, Jonathan J., Botello-Méndez, Andrés R., and Müller, Kai
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Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Materials Science - Abstract
Janus transition metal dichalcogenides (TMDs) lose the horizontal mirror symmetry of ordinary TMDs, leading to the emergence of additional features, such as native piezoelectricity, Rashba effect, and enhanced catalytic activity. While Raman spectroscopy is an essential nondestructive, phase- and composition-sensitive tool to monitor the synthesis of materials, a comprehensive study of the Raman spectrum of Janus monolayers is still missing. Here, we discuss the Raman spectra of WSSe and MoSSe measured at room and cryogenic temperatures, near and off resonance. By combining polarization-resolved Raman data with calculations of the phonon dispersion and using symmetry considerations, we identify the four first-order Raman modes and higher-order two-phonon modes. Moreover, we observe defect-activated phonon processes, which provide a route toward a quantitative assessment of the defect concentration and, thus, the crystal quality of the materials synthesized. Our work establishes a solid background for future research on material synthesis, study, and application of Janus TMD monolayers., Comment: 12 pages, 7 figures, 2 tables
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- 2020
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34. Two-dimensional single crystal monoclinic gallium telluride on silicon substrate via transformation of epitaxial hexagonal phase
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Eugenio Zallo, Andrea Pianetti, Alexander S. Prikhodko, Stefano Cecchi, Yuliya S. Zaytseva, Alessandro Giuliani, Malte Kremser, Nikolai I. Borgardt, Jonathan J. Finley, Fabrizio Arciprete, Maurizia Palummo, Olivia Pulci, and Raffaella Calarco
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Materials of engineering and construction. Mechanics of materials ,TA401-492 ,Chemistry ,QD1-999 - Abstract
Abstract Van der Waals (vdW) epitaxial growth of large-area and stable two-dimensional (2D) materials of high structural quality on crystalline substrates is crucial for the development of novel device technologies. 2D gallium monochalcogenides with low in-plane symmetry stand out among the layered semiconductor materials family for next-generation optoelectronic and energy conversion applications. Here, we demonstrate the formation of large-area, single crystal and optically active 2D monoclinic gallium telluride (m-GaTe) on silicon substrate via rapid thermal annealing induced phase transformation of vdW epitaxial metastable hexagonal gallium telluride (h-GaTe). Stabilization of multilayer h-GaTe on Si occurs due to the role of the first layer symmetry together with efficient GaTe surface passivation. Moreover, we show that the phase transformation of h-GaTe to m-GaTe is accompanied by the strain relaxation between Si substrate and GaTe. This work opens the way to the fabrication of single-crystal 2D anisotropic semiconductors on standard crystalline wafers that are difficult to be obtained by epitaxial methods.
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- 2023
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35. Evaluation of Classic and Quantitative Imaging Features in the Differentiation of Benign and Atypical Lipomatous Soft Tissue Tumors Using a Standardized Multiparametric MRI Protocol: A Prospective Single-Centre Study in 45 Patients
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Leonhard Gruber, Christian Kremser, Bettina Zelger, Anton Schwabegger, Ena Josip, Dietmar Dammerer, Martin Thaler, and Benjamin Henninger
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soft tissue tumors ,atypical lipomatous tumors ,lipoma ,MRI ,imaging features ,ranking ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Background: Discrimination between benign and atypical lipomatous tumors (ALT) is important due to potential local complications and recurrence of ALT but can be difficult due to the often-similar imaging appearance. Using a standardized MRI protocol, this study aimed to rank established and quantitative MRI features by diagnostic value in the differentiation of benign and atypical lipomatous tumors and to develop a robust scoring system. Methods: Patients with clinical or sonographic suspicion of a lipomatous tumor were prospectively and consecutively enrolled from 2015 to 2019 after ethic review board approval. Histology was confirmed for all ALT and 85% of the benign cases. Twenty-one demographic and morphologic and twenty-three quantitative features were extracted from a standardized MRI protocol (T1/T2-proton-density-weighting, turbo-inversion recovery magnitude, T2* multi-echo gradient-echo imaging, qDIXON-Vibe fat-quantification, T1 relaxometry, T1 mapping, diffusion-weighted and post-contrast sequences). A ranking of these features was generated through a Bayes network analysis with gain-ratio feature evaluation. Results: Forty-five patients were included in the analysis (mean age, 61.2 ± 14.2 years, 27 women [60.0%]). The highest-ranked ALT predictors were septation thickness (gain ratio merit [GRM] 0.623 ± 0.025, p = 0.0055), intra- and peritumoral STIR signal discrepancy (GRM 0.458 ± 0.046, p < 0.0001), orthogonal diameter (GRM 0.554 ± 0.188, p = 0.0013), contrast enhancement (GRM 0.235 ± 0.015, p = 0.0010) and maximum diameter (GRM 0.221 ± 0.075, p = 0.0009). The quantitative features did not provide a significant discriminatory value. The highest-ranked predictors were used to generate a five-tiered score for the identification of ALTs (correct classification rate 95.7% at a cut-off of three positive items, sensitivity 100.0%, specificity 94.9%, likelihood ratio 19.5). Conclusions: Several single MRI features have a substantial diagnostic value in the identification of ALT, yet a multiparametric approach by a simple combination algorithm may support radiologists in the identification of lipomatous tumors in need for further histological assessment.
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- 2023
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36. Prognostic value of pulmonary transit time by cardiac magnetic resonance imaging in ST-elevation myocardial infarction
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Pamminger, Mathias, Reindl, Martin, Kranewitter, Christof, Troger, Felix, Tiller, Christina, Holzknecht, Magdalena, Lechner, Ivan, Poskaite, Paulina, Klug, Gert, Kremser, Christian, Reinstadler, Sebastian J., Metzler, Bernhard, and Mayr, Agnes
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- 2023
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37. Discrete Interactions between a few Interlayer Excitons Trapped at a MoSe$_2$-WSe$_2$ Heterointerface
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Kremser, Malte, Brotons-Gisbert, Mauro, Knörzer, Johannes, Gückelhorn, Janine, Meyer, Moritz, Barbone, Matteo, Stier, Andreas V., Gerardot, Brian D., Müller, Kai, and Finley, Jonathan J.
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Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Materials Science ,Condensed Matter - Quantum Gases ,Quantum Physics - Abstract
Interlayer excitons (IXs) in hetero-bilayers of transition metal dichalcogenides (TMDs) represent an exciting emergent class of long-lived dipolar composite bosons in an atomically thin, near-ideal two-dimensional (2D) system. The long-range interactions that arise from the spatial separation of electrons and holes can give rise to novel quantum, as well as classical multi-particle correlation effects. In order to acquire a detailed understanding of the possible many-body effects, the fundamental interactions between individual IXs have to be studied. Here, we trap a tunable number of dipolar within a nanoscale confinement potential induced by placing a MoSe$_2$-WSe$_2$ hetero-bilayer (HBL) onto an array of SiO$_2$ nanopillars. We control the mean occupation of the IX trap via the optical excitation level and observe discrete sharp-line emission from different configurations of interacting IXs. We identify these features as different multiparticle states with $N_{IX}\sim1-5$ via their power dependencies and directly measure the hierarchy of dipolar and exchange interactions as $N_{IX}$ increases. The interlayer biexciton ($N_{IX}=2$) is found to be an emission doublet that is blue-shifted from the single exciton by $\Delta E=(8.4\pm0.6)$ meV and split by $2J=(1.2\pm0.5)$ meV. The blueshift is even more pronounced for triexcitons ($(12.4\pm0.4)$ meV), quadexcitons ($(15.5\pm0.6)$ meV) and quintexcitons ($(18.2\pm0.8)$ meV). These values are shown to be mutually consistent with numerical modelling of dipolar excitons confined to a harmonic trapping potential having a confinement lengthscale in the range $\ell\approx 3$ nm. Our results contribute to the understanding of interactions between IXs in TMD HBLs at the discrete limit of only a few excitations and represent a key step towards exploring quantum correlations between them., Comment: 15 pages, 3 figures plus Supplementary Information (19 pages, 11 pages)
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- 2019
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38. A Joint Deep Learning Approach for Automated Liver and Tumor Segmentation
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Gruber, Nadja, Antholzer, Stephan, Jaschke, Werner, Kremser, Christian, and Haltmeier, Markus
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Computer Science - Computer Vision and Pattern Recognition ,Mathematics - Numerical Analysis - Abstract
Hepatocellular carcinoma (HCC) is the most common type of primary liver cancer in adults, and the most common cause of death of people suffering from cirrhosis. The segmentation of liver lesions in CT images allows assessment of tumor load, treatment planning, prognosis and monitoring of treatment response. Manual segmentation is a very time-consuming task and in many cases, prone to inaccuracies and automatic tools for tumor detection and segmentation are desirable. In this paper, we compare two network architectures, one that is composed of one neural network and manages the segmentation task in one step and one that consists of two consecutive fully convolutional neural networks. The first network segments the liver whereas the second network segments the actual tumor inside the liver. Our networks are trained on a subset of the LiTS (Liver Tumor Segmentation) Challenge and evaluated on data., Comment: To appear in the SAMPTA 2019 proceedings
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- 2019
39. N-chlorotaurine is highly active against respiratory viruses including SARS-CoV-2 (COVID-19) in vitro
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Michaela Lackner, Annika Rössler, André Volland, Marlena Nastassja Stadtmüller, Brigitte Müllauer, Zoltan Banki, Johannes Ströhle, Angela Luttick, Jennifer Fenner, Bettina Sarg, Leopold Kremser, Paul Tone, Heribert Stoiber, Dorothee von Laer, Thorsten Wolff, Carsten Schwarz, and Markus Nagl
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N-chlorotaurine ,COVID-19 ,influenza ,respiratory syncytial virus ,antiviral ,anti-infective ,Infectious and parasitic diseases ,RC109-216 ,Microbiology ,QR1-502 - Abstract
N-chlorotaurine (NCT) a long-lived oxidant generated by leukocytes, can be synthesized chemically and applied topically as an anti-infective to different body sites, including the lung via inhalation. Here, we demonstrate the activity of NCT against viruses causing acute respiratory tract infections, namely severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), influenza viruses, and respiratory syncytial virus (RSV). Virucidal activity of NCT was tested in plaque assays, confirmed by RT-qPCR assays. Attack on virus proteins was investigated by mass spectrometry. NCT revealed broad virucidal activity against all viruses tested at 37°C and pH 7. A significant reduction in infectious particles of SARS-CoV-2 isolates from early 2020 by 1 log10 was detected after 15 min of incubation in 1% NCT. Proteinaceous material simulating body fluids enhanced this activity by transchlorination mechanisms (1 −2 log10 reduction within 1–10 min). Tested SARS-CoV-2 variants B.1.1.7 (Alpha) und B.1.351 (Beta) showed a similar susceptibility. Influenza virus infectious particles were reduced by 3 log10 (H3N2) to 5 log10 (H1N1pdm), RSV by 4 log10 within a few min. Mass spectrometry of NCT-treated SARS-CoV-2 spike protein and 3C-like protease, influenza virus haemagglutinin and neuraminidase, and RSV fusion glycoprotein disclosed multiple sites of chlorination and oxidation as the molecular mechanism of action. Application of 1.0% NCT as a prophylactic and therapeutic strategy against acute viral respiratory tract infections deserves comprehensive clinical investigation.
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- 2022
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40. Social and Psychological Effects of the COVID-19 Pandemic on Middle-School Students: Attendance Options and Changes over Time
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Walters, Glenn D., Runell, Lindsey, and Kremser, Jon
- Abstract
The purpose of this study was to determine whether restrictions put in place during the COVID-19 pandemic affected the social and psychological well-being of early adolescent schoolchildren. Participants were 309 youth (51% female, average age = 12.38 years) enrolled in the sixth, seventh, or eighth grades of a single middle school located in northeastern Pennsylvania, a state that took a moderately proactive approach to the pandemic. Employing a cross-sectional design, students in three instructional conditions (100% in-person, hybrid, 100% online) were compared on nine outcome measures (perceived parental support, perceived parental knowledge, peer deviance, neutralization, cognitive impulsivity, depression, delinquency, bullying victimization, and bullying perpetration). There were no significant between-groups differences, although there was a borderline significant effect for depression (100% online >100% in-person, p = .06). A second set of analyses employed a longitudinal design and compared 174 children who completed the test battery in November 2019, 3 months before the start of the pandemic, and then again in November 2020, 9 months after the start of the pandemic. Three out of nine outcomes displayed significant change: A small reduction in parental support and modest increments in neutralization beliefs and cognitive impulsivity. Although there were no statistically significant differences between the three instructional conditions and only a handful of relatively small and predictable longitudinal changes between November 2019 and November 2020, there were a fair number of individual students who experienced moderate ([more than or equal to] 50%) increases in depression (17.6%), cognitive impulsivity (15.8%), and bullying victimization (11.7%).
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- 2021
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41. PAR-AVISO – die strukturierte Patientenübergabe in der Notaufnahme
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Maurer, Andreas, Thaler, Markus, Kremser, Yvonne, Golger, Patrick, Baubin, Michael, Schinnerl, Adolf, and Neumayr, Agnes
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- 2022
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42. Cardiac magnetic resonance imaging versus computed tomography to guide transcatheter aortic valve replacement: study protocol for a randomized trial (TAVR-CMR)
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Gert Klug, Sebastian Reinstadler, Felix Troger, Magdalena Holzknecht, Martin Reindl, Christina Tiller, Ivan Lechner, Priscilla Fink, Mathias Pamminger, Christian Kremser, Hanno Ulmer, Axel Bauer, Bernhard Metzler, and Agnes Mayr
- Subjects
Transcatheter aortic valve replacement ,Cardiac magnetic resonance ,Computed tomography ,Kidney injury ,Medicine (General) ,R5-920 - Abstract
Abstract Background The standard procedure for the planning of transcatheter aortic valve replacement (TAVR) is the combination of echocardiography, coronary angiography, and cardiovascular computed tomography (TAVR-CT) for the exact determination of the aortic valve dimensions, valve size, and implantation route. However, up to 80% of the patients undergoing TAVR suffer from chronic renal insufficiency. Alternatives to reduce the need for iodinated contrast agents are desirable. Cardiac magnetic resonance (CMR) imaging recently has emerged as such an alternative. Therefore, we aim to investigate, for the first time, the non-inferiority of TAVR-CMR to TAVR-CT regarding efficacy and safety end-points. Methods This is a prospective, randomized, open-label trial. It is planned to include 250 patients with symptomatic severe aortic stenosis scheduled for TAVR based on a local heart-team decision. Patients will be randomized in a 1:1 fashion to receive a predefined TAVR-CMR protocol or to receive a standard TAVR-CT protocol within 2 weeks after inclusion. Follow-up will be performed at hospital discharge after TAVR and after 1 and 2 years. The primary efficacy outcome is device implantation success at discharge. The secondary endpoints are a combined safety endpoint and a combined clinical efficacy endpoint at baseline and at 1 and 2 years, as well as a comparison of imaging procedure related variables. Endpoint definitions are based on the updated 2012 VARC-2 consensus document. Discussion TAVR-CMR might be an alternative to TAVR-CT for planning a TAVR procedure. If proven to be effective and safe, a broader application of TAVR-CMR might reduce the incidence of acute kidney injury after TAVR and thus improve outcomes. Trial registration The trial is registered at ClinicalTrials.gov (NCT03831087). The results will be disseminated at scientific meetings and publication in peer-reviewed journals.
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- 2022
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43. Die Wirtschaft in STAR TREK. Eine populärkulturelle Verarbeitung von Karl Marx’ Vision eines »Reichs der Freiheit«?
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Christian E. W. Kremser
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Star Trek ,Karl Marx ,Ökonomische Utopie ,Ende der ökonomischen Geschichte ,Literature (General) ,PN1-6790 - Abstract
The article takes the claim that the economy of the Federation in Star Trek represents a pop-cultural reception of Karl Marx’s higher phase of communism as its starting point. This assertion will be put to test. In order to do this, Marx’s thoughts about the higher phase of communism as well as descriptions of Star Trek’s economy will be summarized as a first step. Since both the higher phase of communism and the Federation’s economy describe an economic state in which the basic material needs are met, they can both be conceived as material utopias. This is the common ground that explains why it makes sense to draw parallels between Marx and Star Trek. Subsequently, a typology of material utopias is presented. The central distinguishing feature between different kinds of material utopias is the recommended strategy to establish a state of frugality. Here, a striking difference becomes apparent: According to Marx, the higher phase of communism, depends on unleashing the productive forces, while Star Trek focuses on changing the people’s minds regarding economic matters. Therefore, Marx’s higher phase of communism should be regarded as a technical utopia, whereas the economy of the Federation is best considered to be an ethical utopia.Die
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- 2023
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44. Körper und Kleidung in Psalm 45
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Konrad Kremser
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The Bible ,BS1-2970 - Abstract
Beschreibungen von Körperteilen sowohl des Königs als auch der Königstochter in Ps 45 zielen über den jeweiligen Teil des Körpers hinaus auf die Person als ganze. Anders als dem Körper wurde der Wahrnehmung der Kleidung bisher wenig Aufmerksamkeit zuteil. Die Beschreibung der Kleidung kann jedoch analog zu derjenigen des Körpers analysiert werden. Die Kleidung des Königs und der Königstochter haben nicht so sehr die Funktion, den Körper zu verhüllen, als ihn in einer sozial angemessenen Weise zur Schau zu stellen. Die (die soziale Stellung ausdrückende) Schönheit sowohl des Königs als auch der Königstochter ergibt sich erst durch die Kombination von Körper und Kleidung.
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- 2023
45. The Fear of Being Bullied on the School Bus: Perceptions, Correlations, and Sex Differences
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Glenn D. Walters, Jon Kremser, and Lindsey Runell
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The goals of this study were to determine whether children who took the bus to school on a regular basis felt safest during the commute to school, in school, or on the commute home from school, and to identify the factors that correlate with fear of being bullied on the bus. A sample of 610 students (296 boys, 313 girls; mean age = 11.25 years, SD = 0.51) was surveyed during the fall semester of their first year of middle school (sixth grade). Students indicated that they felt safer in school than they did on the commute to or from school, which nearly always occurred by bus. Sex differences were investigation and found to be small in number and magnitude. These differences were limited to slightly more girls than boys reporting feeling safer in school, slightly more boys than girls reporting feeling safer on the commute home from school, and a modestly stronger association between bullying victimization and fear of being bullied on the school bus in boys than in girls, although the effect was significant in both sexes. There were no significant differences between boys and girls in their overall level of fear of bullying on the bus. A full sample regression analysis revealed significant correlations between the risk factors of bullying victimization and depression, and a child's fear of being bullied on the bus, suggesting that such fears are related to past victimization and current feelings of sadness, loneliness, and reduced energy.
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- 2021
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46. MRI analysis of simple and aneurysmal bone cysts in the proximal humerus: what actually matters in clinical routine
- Author
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Josip, E., Kremser, C., Haider, B., Thaler, M., Dammerer, D., and Henninger, B.
- Published
- 2022
- Full Text
- View/download PDF
47. Cardiac magnetic resonance imaging versus computed tomography to guide transcatheter aortic valve replacement: study protocol for a randomized trial (TAVR-CMR)
- Author
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Klug, Gert, Reinstadler, Sebastian, Troger, Felix, Holzknecht, Magdalena, Reindl, Martin, Tiller, Christina, Lechner, Ivan, Fink, Priscilla, Pamminger, Mathias, Kremser, Christian, Ulmer, Hanno, Bauer, Axel, Metzler, Bernhard, and Mayr, Agnes
- Published
- 2022
- Full Text
- View/download PDF
48. ACKR3 regulates platelet activation and ischemia-reperfusion tissue injury
- Author
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Rohlfing, Anne-Katrin, Kolb, Kyra, Sigle, Manuel, Ziegler, Melanie, Bild, Alexander, Münzer, Patrick, Sudmann, Jessica, Dicenta, Valerie, Harm, Tobias, Manke, Mailin-Christin, Geue, Sascha, Kremser, Marcel, Chatterjee, Madhumita, Liang, Chunguang, von Eysmondt, Hendrik, Dandekar, Thomas, Heinzmann, David, Günter, Manina, von Ungern-Sternberg, Saskia, Büttcher, Manuela, Castor, Tatsiana, Mencl, Stine, Langhauser, Friederike, Sies, Katharina, Ashour, Diyaa, Beker, Mustafa Caglar, Lämmerhofer, Michael, Autenrieth, Stella E., Schäffer, Tilman E., Laufer, Stefan, Szklanna, Paulina, Maguire, Patricia, Heikenwalder, Matthias, Müller, Karin Anne Lydia, Hermann, Dirk M., Kilic, Ertugrul, Stumm, Ralf, Ramos, Gustavo, Kleinschnitz, Christoph, Borst, Oliver, Langer, Harald F., Rath, Dominik, and Gawaz, Meinrad
- Published
- 2022
- Full Text
- View/download PDF
49. Dimensions and forms of artefacts in 1.5 T and 3 T MRI caused by cochlear implants
- Author
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Gottfried, Timo M., Dejaco, Daniel, Fischer, Natalie, Innerhofer, Veronika, Chacko, Lejo Johnson, Widmann, Gerlig, Kremser, Christian, Riechelmann, Herbert, and Schmutzhard, Joachim
- Published
- 2022
- Full Text
- View/download PDF
50. A novel approach to determine aortic valve area with phase-contrast cardiovascular magnetic resonance
- Author
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Troger, Felix, Lechner, Ivan, Reindl, Martin, Tiller, Christina, Holzknecht, Magdalena, Pamminger, Mathias, Kremser, Christian, Schwaiger, Johannes, Reinstadler, Sebastian J., Bauer, Axel, Metzler, Bernhard, Mayr, Agnes, and Klug, Gert
- Published
- 2022
- Full Text
- View/download PDF
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