7,089 results on '"Seifert IS"'
Search Results
2. What the avian eye tells its brain : processing of chromatic and achromatic information at the level of chicken retinal ganglion cells
- Author
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Seifert, Marvin
- Subjects
QL0671 Birds - Abstract
Birds have highly sophisticated vision, including tetrachromacy but it is unknown how visual information is processed within the retina. Using a high density multielectrode, stimulus driven extracellular electrical signals of multiple retinal ganglion cells (RGC) were measured in parallel. Twenty-seven functionally distinct RGC types were identified by clustering, revealing major principles of avian RGC electrophysiology: Firstly, most RGCs were excited by both ON and OFF steps, and had complex chromatic sensitivities and opponency responses, often in combination with wavelength dependent and long response latencies in the ON channel. These RGCs resemble small bistratified (blue-ON) RGCs in the primate retina. A second group of RGCs showed OFF dominant responses, faster response latencies, and simpler spectral sensitivities, likely matching double cones. These cells potentially form a classical achromatic contrast pathway, like primate alpha/parasol RGCs. Focusing on wavelength dependent response latencies, we found that except for near UV responses, long wavelength ON-responses yielded the shortest latency and most synchronised responses, consistently followed by shorter wavelengths. Combining these insights, we used principal component analysis of flash-responses to reveal that greyscale and "colour" stimuli are encoded in a near-orthogonal manner. We tentatively suggest that birds use a combination of time- and opponency-coding to represent spectral information, while a smaller proportion of cells act as fast greyscale OFF channels which serve achromatic vision.
- Published
- 2022
3. Cast iron cannonballs of the Mary Rose : quantifying corrosion rates to inform management of the collection
- Author
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Seifert, Jerrod H.
- Subjects
930.1 ,D History (General) ,DA Great Britain - Abstract
Managing heritage collections requires understanding of their response to storage and display environments. For heritage iron artefacts, and especially those from marine contexts, this environmental response is influenced by corrosion-instigating chlorides that remain after conservation treatments designed to remove them have been completed. Previous studies have shown that measuring chlorides extracted during treatment does not accurately inform on how many chlorides remain. Artefacts are then placed on display or in storage under the assumption it is safe to do so, when in fact their environment may be causing them to deteriorate at a rate that compromises their structural integrity and cultural value. It is this problem that faces the 1248 cast iron cannonballs from the Mary Rose, Henry VIII's Tudor-era warship that sank in 1545 and was excavated beginning in 1971. Many treatment methods have been employed on the cannonballs to mitigate their corrosion, yet they continue to show visible signs of corrosion in a range of humidities. Nearly all of the cast iron cannonballs are now in desiccated or passivating storage, robbing the public of crucial context their display would otherwise provide. This study set out to determine the corrosion rates of 56 variously treated cannonballs from the Mary Rose, to inform on and determine their best practices for their ongoing care. Using non-invasive oxygen consumption monitoring to determine their corrosion rates confirmed earlier studies on wrought iron showing the escalating risk faced with escalating humidity. All cannonballs exhibited negligible gains from 20-40% RH, followed by substantial increases at 50% RH and again at 60% RH. Selected cannonballs were then retreated in order to determine if their corrosion rates could be reduced. The results showed that not only did retreatment fail to reduce corrosion rates, doing so caused those rates to increase for most of the samples that underwent the procedure, thereby ruling out retreatment as a viable option until new methods are assessed. By using the methodology and data presented in this study, the Mary Rose Trust is now able to ascertain the risk to each of their cast iron cannonballs post-treatment, and can use that knowledge to mitigate the deterioration of the assemblage.
- Published
- 2021
4. A philosophical analysis of the relation between chemistry and quantum mechanics : the case of a single inert molecule
- Author
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Seifert, Vanessa and Ladyman, James
- Subjects
100 ,Philosophy of Chemistry ,Philosophy of Science - Abstract
This thesis investigates the epistemological and metaphysical relations between chemistry and quantum mechanics. These relations are examined with respect to how chemistry and quantum mechanics each describe a single inert molecule. A review of how these relations are understood in the literature shows that there is a proliferation of positions which focus on how chemistry is separate from quantum mechanics. This proliferation is accompanied by a tendency within the philosophy of chemistry community to connect the legitimacy of the field with the autonomy of chemistry. First, it is argued that this connection should not be made. Secondly, it is argued that chemistry and quantum mechanics are unified in accordance with Harold Kincaid's model of non-reductive unity because the two theories exhibit particular epistemic and metaphysical interconnections. Thirdly, a metaphysical account is examined which is incompatible with Kincaid's model of unity; namely strong emergence as understood by Robin Hendry. According to Hendry, the structure of a single inert molecule strongly emerges from its quantum mechanical entities in the sense that there is downward causation. However, Hendry's defense of this account faces certain problems. Moreover, the putative empirical evidence for his understanding of strong emergence can be explained without invoking strong emergence. This is shown by considering how quantum mechanics assumes an idealized understanding of a molecule's stability and structure. In the light of the philosophical literature on idealizations, this idealization can be interpreted in two different ways, both of which explain why quantum mechanics describes the structure of a single molecule the way it does, without assuming strong emergence in Hendry's sense. Each interpretation has philosophical implications regarding the nature of chemical properties, and the relation of chemistry and quantum mechanics. These implications are consistent with Kincaid's model of unity and thus further support chemistry's unity with quantum mechanics (as per Kincaid).
- Published
- 2019
5. Wieso und worüber muss eine Patientin informiert werden?: Bemerkungen zum Vorschlag von Johann Ach und Bettina Schöne-Seifert
- Author
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Ach, Johann S, Schöne-Seifert, Bettina, Ach, J S ( Johann S ), Schöne-Seifert, B ( Bettina ), Schaber, Peter; https://orcid.org/0000-0002-9613-629X, Ach, Johann S, Schöne-Seifert, Bettina, Ach, J S ( Johann S ), Schöne-Seifert, B ( Bettina ), and Schaber, Peter; https://orcid.org/0000-0002-9613-629X
- Published
- 2024
6. On the Explainability of Financial Robo-Advice Systems
- Author
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Longo, Luca, Lapuschkin, Sebastian; https://orcid.org/0000-0002-0762-7258, Seifert, Christin, Longo, L ( Luca ), Lapuschkin, S ( Sebastian ), Seifert, C ( Christin ), Vilone, Giulia; https://orcid.org/0000-0002-4401-5664, Sovrano, Francesco; https://orcid.org/0000-0002-6285-1041, Lognoul, Michaël; https://orcid.org/0009-0005-5137-8278, Longo, Luca, Lapuschkin, Sebastian; https://orcid.org/0000-0002-0762-7258, Seifert, Christin, Longo, L ( Luca ), Lapuschkin, S ( Sebastian ), Seifert, C ( Christin ), Vilone, Giulia; https://orcid.org/0000-0002-4401-5664, Sovrano, Francesco; https://orcid.org/0000-0002-6285-1041, and Lognoul, Michaël; https://orcid.org/0009-0005-5137-8278
- Abstract
Significant investment and development have been made in integrating artificial intelligence (AI) into finance applications. However, the opacity of AI systems raises concerns about essential characteristics needed in sensitive finance applications, such as transparency and accountability. Our study addresses these concerns by investigating a process for analysing explanations generated by AI-based robo-advice systems to comply with the explanation requirements of key EU regulations, including the Markets in Financial Instruments Directive (MiFID) II. We adopt a comprehensive methodology that involves analysing these regulations to identify the specific questions that must be answered by an explanation generated by a robo-advice system to meet legal explainability requirements. Our findings provide a nuanced understanding of which Explainable AI technology may be needed to answer those questions by AI-based robo-advice systems. We demonstrate this through practical case studies on financial advice given by robo-advisers based on AI language-generating models. These case studies highlight our research’s practical utility for the finance industry, which might seek to exploit these new technologies to generate financial advice that meets legal explainability requirements. This study fills a crucial gap in aligning Explainable AI applications in finance with stringent provisions of EU regulations. It provides a practical framework for developers and researchers to ensure their AI innovations advance technology and adhere to legal and ethical standards.
- Published
- 2024
7. In vivo dynamic AFM mapping of viscoelastic properties of the primary plant cell wall
- Author
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Seifert, Jacob, Moore, Ian, and Contera, Sonia
- Subjects
572 - Abstract
Plant development is a complex multiscale process out of thermodynamic equilibrium. While sophisticated mathematical models of this process exist, there are only a few studies which provide experimental evidence. At the cellular level, unidirectional plant growth can be described by the viscoelastic Maxwell (MW) model. At the subcellular level more complicated thermodynamic models exist for which experimental proof is missing, due to the lack of suitable experimental methods. Modern approaches in multifrequency AFM enable high resolution viscoelastic mapping for cells and polymers. However, these methods are based on the viscoelastic Kelvin-Voigt model and, therefore, the viscoelastic properties cannot be associated with plant growth. I provide a link between the generalised MW model and the AFM cantilever observables. Then I show that the primary plant cell wall (CW) behaves, at the subcellular level, like a standard linear solid (SLS). I further use the description of the CW as a SLS and the spatial information of the dynamic modulus to determine the characteristic quantities k
∞ , kM , η, and τ of the SLS with spatial resolution. The application of two eigenmodes suggests that it is possible to extend the approach from the SLS description to reconstruct the relaxation modulus of polymer networks. This is demonstrated by the stiffness k2 and relaxation time τT2 which are increased and decreased, respectively, compared to the first eigenmode. Finally, using the example of whole living seedlings of the plant Arabidopsis thaliana, I use this theoretical framework to demonstrate, that the viscoelastic properties at a subcellular level can be linked to thermodynamic models of plant growth. I show that these can be derived using the Onsager principle I develop a non-equilibrium approach to describe the time evolution of thermodynamic systems. Moreover, pharmacological and genetic manipulation of young seedlings indicates that these viscoelastic measurements can be used as an analytical tool to characterise CW deficiencies.- Published
- 2018
8. Temperature-Dependent Twist of Double-Stranded RNA Probed by Magnetic Tweezer Experiments and Molecular Dynamics Simulations
- Author
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Dohnalová, Hana, Seifert, Mona, Matoušková, Eva, Klein, Misha, Papini, Flávia S., Lipfert, Jan, Dulin, David, Lankaš, Filip, Dohnalová, Hana, Seifert, Mona, Matoušková, Eva, Klein, Misha, Papini, Flávia S., Lipfert, Jan, Dulin, David, and Lankaš, Filip
- Published
- 2024
9. The many laws in the periodic table
- Author
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Seifert, Vanessa A. and Seifert, Vanessa A.
- Abstract
There are many- not just one- periodic laws in chemistry. These laws correspond to non-accidental regularity relations about physical and chemical properties of (sets of) chemical elements. I support this by showing how these regularity relations can be understood from the perspective of a philosophical analysis of laws. Specifically, I show that these relations instantiate standard features associated with laws; they can be spelled out in terms of two standard accounts of laws; and, they can coherently figure in debates about the reality of laws as plausible candidates of ceteris paribus laws.
- Published
- 2024
10. Single and combined exposures to bisphenol A and benzophenone-3 during early mouse pregnancy have differential effects on fetal and placental development
- Author
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Fischer, Florence, Kretschmer, Tobias, Seifert, Paulina, Howanski, Julia, Krieger, Elisabeth, Rödiger, Jonas, Fink, Beate, Yin, Ziran, Bauer, Mario, Zenclussen, M.L., Meyer, Nicole, Schumacher, Anne, Zenclussen, Ana Claudia, Fischer, Florence, Kretschmer, Tobias, Seifert, Paulina, Howanski, Julia, Krieger, Elisabeth, Rödiger, Jonas, Fink, Beate, Yin, Ziran, Bauer, Mario, Zenclussen, M.L., Meyer, Nicole, Schumacher, Anne, and Zenclussen, Ana Claudia
- Published
- 2024
11. Post-Transcriptional Methylation of Mitochondrial-tRNA Differentially Contributes to Mitochondrial Pathology
- Author
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Maharjan, Sunita, Gamper, Howard, Yamaki, Yuka, Christian, Thomas W., Henley, Robert Y., Li, Nan-Sheng, Suzuki, Takeo, Suzuki, Tsutomu, Piccirilli, Joseph A., Wanunu, Meni, Seifert, Erin L., Wallace, Douglas C., Hou, Ya-Ming, Maharjan, Sunita, Gamper, Howard, Yamaki, Yuka, Christian, Thomas W., Henley, Robert Y., Li, Nan-Sheng, Suzuki, Takeo, Suzuki, Tsutomu, Piccirilli, Joseph A., Wanunu, Meni, Seifert, Erin L., Wallace, Douglas C., and Hou, Ya-Ming
- Abstract
Human mitochondrial tRNAs (mt-tRNAs), critical for mitochondrial biogenesis, are frequently associated with pathogenic mutations. These mt-tRNAs have unusual sequence motifs and require post-transcriptional modifications to stabilize their fragile structures. However, whether a modification that stabilizes a wild-type (WT) mt-tRNA would also stabilize its pathogenic variants is unknown. Here we show that the N1-methylation of guanosine at position 9 (m1G9) of mt-Leu(UAA), while stabilizing the WT tRNA, has a destabilizing effect on variants associated with MELAS (mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes). This differential effect is further demonstrated, as removal of the m1G9 methylation, while damaging to the WT tRNA, is beneficial to the major pathogenic variant, improving the structure and activity of the variant. These results have therapeutic implications, suggesting that the N1-methylation of mt-tRNAs at position 9 is a determinant of pathogenicity and that controlling the methylation level is an important modulator of mt-tRNA-associated diseases.
- Published
- 2024
12. Perturbations of non-autonomous second-order abstract Cauchy problems
- Author
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Budde, Christian, Seifert, Christian, Budde, Christian, and Seifert, Christian
- Abstract
In this paper we present time-dependent perturbations of second-order non-autonomous abstract Cauchy problems associated to a family of operators with constant domain. We make use of the equivalence to a first-order non-autonomous abstract Cauchy problem in a product space, which we elaborate in full detail. As an application we provide a perturbed non-autonomous wave equation.
- Published
- 2024
13. Approximation of evolution equations with random data
- Author
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Seifert, Christian, Klioba, Katharina, Seifert, Christian, and Klioba, Katharina
- Abstract
Evolution equations are partial differential equations (PDEs) that describe evolution over time. To account for random perturbations, random coefficients or noise terms are added, often requiring a numerical solution. The contributions of this thesis are twofold. First, a joint convergence rate is presented for the approximation in randomness, space, and time using polynomial chaos for the random coefficients. Second, convergence rates for the pathwise uniform error in time are obtained for nonlinear stochastic PDEs in the hyperbolic Kato setting., Evolutionsgleichungen sind partielle Differentialgleichungen (PDEs), die die zeitliche Entwicklung beschreiben. Um zufällige Einflüsse zu modellieren, werden zufällige Koeffizienten oder Rauschterme hinzugefügt, die oft eine numerische Lösung erfordern. Im Fall zufälliger Koeffizienten wird eine gemeinsame Konvergenzrate für die Approximation in Zufälligkeit, Raum und Zeit unter Verwendung von polynomiellem Chaos vorgestellt. Für nichtlineare stochastische PDEs werden Konvergenzraten für den pfadweise gleichmäßigen Fehler der Zeitdiskretisierung erzielt.
- Published
- 2024
14. Identification of neoantigen-specific T-cell responses in diverse rare tumor entities
- Author
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Krackhardt, Angela (Prof. Dr.), Krackhardt, Angela (Prof. Dr.);Heidegger, Simon (Priv.-Doz. Dr.), Seifert, Philipp Martin, Krackhardt, Angela (Prof. Dr.), Krackhardt, Angela (Prof. Dr.);Heidegger, Simon (Priv.-Doz. Dr.), and Seifert, Philipp Martin
- Abstract
Cancer immunotherapy has shown high efficacy in many neoplasms and is transforming the treatment of malignant diseases. By detailed analysis of the proteogenomic data of 32 patients across 25 tumor types, non-wild type HLA-binding peptides (potential neoantigens) were identified, and their specific characteristics were analyzed. In silico binding predictions provided a basis for prioritization, and an immunogenicity assessment assay was used to measure neoantigen-dependent interferon-based T-cell responses to screen for possible target candidates., Die Behandlung von Krebserkrankungen durch Immuntherapien verändert gerade grundlegend die bisher etablierten Therapiekonzepte. Anhand der Auswertung der proteo-genomischen Daten von 32 Patienten mit 25 verschiedenen Tumorarten, wurden mutierte MHC-präsentierte Peptide als potentielle Neoantigene identifiziert und charakterisiert. Mithilfe der Simulation ihrer Bindungseigenschaften konnten diese priorisiert und deren Immunogenität durch Interferon-basierte in vitro Stimulationsversuche beurteilt werden.
- Published
- 2024
15. Design and performance of the Climate Change Initiative Biomass global retrieval algorithm
- Author
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Santoro, M., Cartus, O., Quegan, S., Kay, H., Lucas, R.M., Araza, A., Herold, M., Labrière, N., Chave, J., Rosenqvist, Å., Tadono, T., Kobayashi, K., Kellndorfer, J., Avitabile, V., Brown, H., Carreiras, J., Campbell, M.J., Cavlovic, J., Bispo, P.d.C., Gilani, H., Khan, M.L., Kumar, A., Lewis, S.L., Liang, J., Mitchard, E.T.A., Pacheco-Pascagaza, A.M., Phillips, O.L., Ryan, C.M., Saikia, P., Shchepashchenko, D., Sukhdeo, H., Verbeeck, H., Vieilledent, G., Wijaya, A., Willcock, S., Seifert, F.M., Santoro, M., Cartus, O., Quegan, S., Kay, H., Lucas, R.M., Araza, A., Herold, M., Labrière, N., Chave, J., Rosenqvist, Å., Tadono, T., Kobayashi, K., Kellndorfer, J., Avitabile, V., Brown, H., Carreiras, J., Campbell, M.J., Cavlovic, J., Bispo, P.d.C., Gilani, H., Khan, M.L., Kumar, A., Lewis, S.L., Liang, J., Mitchard, E.T.A., Pacheco-Pascagaza, A.M., Phillips, O.L., Ryan, C.M., Saikia, P., Shchepashchenko, D., Sukhdeo, H., Verbeeck, H., Vieilledent, G., Wijaya, A., Willcock, S., and Seifert, F.M.
- Abstract
The increase in Earth observations from space in recent years supports improved quantification of carbon storage by terrestrial vegetation and fosters studies that relate satellite measurements to biomass retrieval algorithms. However, satellite observations are only indirectly related to the carbon stored by vegetation. While ground surveys provide biomass stock measurements to act as reference for training the models, they are sparsely distributed. Here, we addressed this problem by designing an algorithm that harnesses the interplay of satellite observations, modeling frameworks and field measurements, and generated global estimates of above-ground biomass (AGB) density that meet the requirements of the scientific community in terms of accuracy, spatial and temporal resolution. The design was adapted to the amount, type and spatial distribution of satellite data available around the year 2020. The retrieval algorithm estimated AGB annually by merging estimates derived from C- and L-band Synthetic Aperture Radar (SAR) backscatter observations with a Water Cloud type of model and does not rely on AGB reference data at the same spatial scale as the SAR data. This model is integrated with functions relating to forest structural variables that were trained on spaceborne LiDAR observations and sub-national AGB statistics. The yearly estimates of AGB were successively harmonized using a cost function that minimizes spurious fluctuations arising from the moderate-to-weak sensitivity of the SAR backscatter to AGB. The spatial distribution of the AGB estimates was correctly reproduced when the retrieval model was correctly set. Over-predictions occasionally occurred in the low AGB range (<50 Mg ha−1) and under-predictions in the high AGB range (>300 Mg ha−1). These errors were a consequence of sometimes too strong generalizations made within the modeling framework to allow reliable retrieval worldwide at the expense of accuracy. The precision of the estimates was mostly be
- Published
- 2024
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16. Design and performance of the Climate Change Initiative Biomass global retrieval algorithm
- Author
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Santoro, Maurizio, Cartus, Oliver, Quegan, Shaun, Kay, Heather, Lucas, Richard M., Araza, Arnan, Herold, Martin, Labrière, Nicolas, Chave, Jérôme, Rosenqvist, Åke, Tadono, Takeo, Kobayashi, Kazufumi, Kellndorfer, Josef, Avitabile, Valerio, Brown, Hugh, Carreiras, João, Campbell, Michael J., Cavlovic, Jura, da Conceição Bispo, Polyanna, Gilani, Hammad, Khan, Mohammed Latif, Kumar, Amit, Lewis, Simon L., Liang, Jingjing, Mitchard, Edward T.A., Pacheco-Pascagaza, Ana María, Phillips, Oliver L., Ryan, Casey M., Saikia, Purabi, Schepaschenko, Dmitry, Sukhdeo, Hansrajie, Verbeeck, Hans, Vieilledent, Ghislain, Wijaya, Arief, Willcock, Simon, Seifert, Frank Martin, Santoro, Maurizio, Cartus, Oliver, Quegan, Shaun, Kay, Heather, Lucas, Richard M., Araza, Arnan, Herold, Martin, Labrière, Nicolas, Chave, Jérôme, Rosenqvist, Åke, Tadono, Takeo, Kobayashi, Kazufumi, Kellndorfer, Josef, Avitabile, Valerio, Brown, Hugh, Carreiras, João, Campbell, Michael J., Cavlovic, Jura, da Conceição Bispo, Polyanna, Gilani, Hammad, Khan, Mohammed Latif, Kumar, Amit, Lewis, Simon L., Liang, Jingjing, Mitchard, Edward T.A., Pacheco-Pascagaza, Ana María, Phillips, Oliver L., Ryan, Casey M., Saikia, Purabi, Schepaschenko, Dmitry, Sukhdeo, Hansrajie, Verbeeck, Hans, Vieilledent, Ghislain, Wijaya, Arief, Willcock, Simon, and Seifert, Frank Martin
- Abstract
The increase in Earth observations from space in recent years supports improved quantification of carbon storage by terrestrial vegetation and fosters studies that relate satellite measurements to biomass retrieval algorithms. However, satellite observations are only indirectly related to the carbon stored by vegetation. While ground surveys provide biomass stock measurements to act as reference for training the models, they are sparsely distributed. Here, we addressed this problem by designing an algorithm that harnesses the interplay of satellite observations, modeling frameworks and field measurements, and generated global estimates of above-ground biomass (AGB) density that meet the requirements of the scientific community in terms of accuracy, spatial and temporal resolution. The design was adapted to the amount, type and spatial distribution of satellite data available around the year 2020. The retrieval algorithm estimated AGB annually by merging estimates derived from C- and L-band Synthetic Aperture Radar (SAR) backscatter observations with a Water Cloud type of model and does not rely on AGB reference data at the same spatial scale as the SAR data. This model is integrated with functions relating to forest structural variables that were trained on spaceborne LiDAR observations and sub-national AGB statistics. The yearly estimates of AGB were successively harmonized using a cost function that minimizes spurious fluctuations arising from the moderate-to-weak sensitivity of the SAR backscatter to AGB. The spatial distribution of the AGB estimates was correctly reproduced when the retrieval model was correctly set. Over-predictions occasionally occurred in the low AGB range (<50 Mg ha−1) and under-predictions in the high AGB range (>300 Mg ha−1). These errors were a consequence of sometimes too strong generalizations made within the modeling framework to allow reliable retrieval worldwide at the expense of accuracy. The precision of the estimates was mostly be
- Published
- 2024
17. A Guide to Feature Importance Methods for Scientific Inference
- Author
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Longo, Luca, Lapuschkin, Sebastian, Seifert, Christin, Ewald, Fiona Katharina, Bothmann, Ludwig, Wright, Marvin N., Bischl, Bernd, Casalicchio, Giuseppe, König, Gunnar, Longo, Luca, Lapuschkin, Sebastian, Seifert, Christin, Ewald, Fiona Katharina, Bothmann, Ludwig, Wright, Marvin N., Bischl, Bernd, Casalicchio, Giuseppe, and König, Gunnar
- Abstract
While machine learning (ML) models are increasingly used due to their high predictive power, their use in understanding the data-generating process (DGP) is limited. Understanding the DGP requires insights into feature-target associations, which many ML models cannot directly provide due to their opaque internal mechanisms. Feature importance (FI) methods provide useful insights into the DGP under certain conditions. Since the results of different FI methods have different interpretations, selecting the correct FI method for a concrete use case is crucial and still requires expert knowledge. This paper serves as a comprehensive guide to help understand the different interpretations of global FI methods. Through an extensive review of FI methods and providing new proofs regarding their interpretation, we facilitate a thorough understanding of these methods and formulate concrete recommendations for scientific inference. We conclude by discussing options for FI uncertainty estimation and point to directions for future research aiming at full statistical inference from black-box ML models.
- Published
- 2024
18. Toward Understanding the Disagreement Problem in Neural Network Feature Attribution
- Author
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Longo, Luca, Lapuschkin, Sebastian, Seifert, Christin, Koenen, Niklas, Wright, Marvin N., Longo, Luca, Lapuschkin, Sebastian, Seifert, Christin, Koenen, Niklas, and Wright, Marvin N.
- Abstract
In recent years, neural networks have demonstrated their remarkable ability to discern intricate patterns and relationships from raw data. However, understanding the inner workings of these black box models remains challenging, yet crucial for high-stake decisions. Among the prominent approaches for explaining these black boxes are feature attribution methods, which assign relevance or contribution scores to each input variable for a model prediction. Despite the plethora of proposed techniques, ranging from gradient-based to backpropagation-based methods, a significant debate persists about which method to use. Various evaluation metrics have been proposed to assess the trustworthiness or robustness of their results. However, current research highlights disagreement among state-of-the-art methods in their explanations. Our work addresses this confusion by investigating the explanations’ fundamental and distributional behavior. Additionally, through a comprehensive simulation study, we illustrate the impact of common scaling and encoding techniques on the explanation quality, assess their efficacy across different effect sizes, and demonstrate the origin of inconsistency in rank-based evaluation metrics.
- Published
- 2024
19. Sufficient criteria for stabilization properties in Banach Spaces
- Author
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Egidi, Michela, Gallaun, Dennis, Seifert, Christian, Tautenhahn, Martin, Egidi, Michela, Gallaun, Dennis, Seifert, Christian, and Tautenhahn, Martin
- Abstract
We study abstract sufficient criteria for cost-uniform open-loop stabilizability of linear control systems in a Banach space with a bounded control operator, which build up and generalize a sufficient condition for null-controllability in Banach spaces given by an uncertainty principle and a dissipation estimate. For stabilizability these estimates are only needed for a single spectral parameter and, in particular, their constants do not depend on the growth rate w.r.t. this parameter. Our result unifies and generalizes earlier results obtained in the context of Hilbert spaces. As an application we consider fractional powers of elliptic differential operators with constant coefficients in Lp(Rd) for p∈[1,∞) and thick control sets.
- Published
- 2024
20. Thermo-expandable intraprostatic nitinol stents in the treatment of bladder outlet obstruction:a consecutive case series
- Author
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Arch, Albert, Thamsborg, Andreas, Winck-Flyvholm, Lilli, Seifert, Rie, Fode, Mikkel, Arch, Albert, Thamsborg, Andreas, Winck-Flyvholm, Lilli, Seifert, Rie, and Fode, Mikkel
- Abstract
OBJECTIVE: In high-risk patients, prostatic stents may alleviate obstruction at the prostate level. Since 2020 we have used thermo-expandable intraprostatic nitinol stents. Here we document outcomes through the first years with the procedure. MATERIAL AND METHODS: We reviewed patients who had undergone stent treatment between May 2020 and October 2023. Patient and procedural data, urinary symptoms, complications and side effects were recorded. Descriptive statistics were used to summarize outcomes and we evaluated predictors of success and complications using robust multiple regression analyses. RESULTS: We included 52 consecutive patients with a median age of 82 years (range 71-96) and a median Charlson Comorbidity Index of 6 (3-11). Forty-seven men used indwelling catheters, two used clean intermittent catheterization, and three had severe lower urinary tract symptoms. Stents were placed under general anesthesia, sedation, and local anesthesia in 39, 4, and 9 men, respectively. The median treatment time was 14 min (range 8-40). One complication, in the form of an infection requiring IV antibiotics, occurred. Subsequently, 45 men (87%) were able to void spontaneously without bothersome symptoms. After a median of 11 (2-44) months, 8 men had their stents removed due to recurring symptoms. This gives an overall success rate of 37/52 patients (71%). No predictors of success or complications were identified. CONCLUSIONS: Thermo-expandable intraprostatic nitinol stents demonstrate a high success rate with a low risk of complications and may serve as an alternative to permanent or intermittent catheterization for men who are unable or unwilling to undergo flow-improving surgery.
- Published
- 2024
21. CountARFactuals – Generating Plausible Model-Agnostic Counterfactual Explanations with Adversarial Random Forests
- Author
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Longo, Luca, Lapuschkin, Sebastian, Seifert, Christin, Dandl, Susanne, Blesch, Kristin, Freiesleben, Timo, König, Gunnar, Kapar, Jan, Bischl, Bernd, Wright, Marvin N., Longo, Luca, Lapuschkin, Sebastian, Seifert, Christin, Dandl, Susanne, Blesch, Kristin, Freiesleben, Timo, König, Gunnar, Kapar, Jan, Bischl, Bernd, and Wright, Marvin N.
- Abstract
Counterfactual explanations elucidate algorithmic decisions by pointing to scenarios that would have led to an alternative, desired outcome. Giving insight into the model’s behavior, they hint users towards possible actions and give grounds for contesting decisions. As a crucial factor in achieving these goals, counterfactuals must be plausible, i.e., describing realistic alternative scenarios within the data manifold. This paper leverages a recently developed generative modeling technique – adversarial random forests (ARFs) – to efficiently generate plausible counterfactuals in a model-agnostic way. ARFs can serve as a plausibility measure or directly generate counterfactual explanations. Our ARFbased approach surpasses the limitations of existing methods that aim to generate plausible counterfactual explanations: It is easy to train and computationally highly efficient, handles continuous and categorical data naturally, and allows integrating additional desiderata such as sparsity in a straightforward manner., Counterfactual explanations elucidate algorithmic decisions by pointing to scenarios that would have led to an alternative, desired outcome. Giving insight into the model’s behavior, they hint users towards possible actions and give grounds for contesting decisions. As a crucial factor in achieving these goals, counterfactuals must be plausible, i.e., describing realistic alternative scenarios within the data manifold. This paper leverages a recently developed generative modeling technique – adversarial random forests (ARFs) – to efficiently generate plausible counterfactuals in a model-agnostic way. ARFs can serve as a plausibility measure or directly generate counterfactual explanations. Our ARF-based approach surpasses the limitations of existing methods that aim to generate plausible counterfactual explanations: It is easy to train and computationally highly efficient, handles continuous and categorical data naturally, and allows integrating additional desiderata such as sparsity in a straightforward manner.
- Published
- 2024
22. Business Analytics und Operations Management in der Klinik
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Swoboda, Walter, Seifert, Nadine, Grieger, Milena, Schoenfelder, Jan, Brunner, Jens O., Swoboda, Walter, Seifert, Nadine, Grieger, Milena, Schoenfelder, Jan, and Brunner, Jens O.
- Abstract
Der Pflegenotstand ist vor allem seit Beginn der COVID-19-Pandemie so präsent wie noch nie. Diese Entwicklung führt zu einem wachsenden Bedarf an Pflegekräften und an einer gut funktionierenden Pflegeinfrastruktur. Verschiedene Faktoren, darunter der demografische Wandel sowie eine abnehmende Attraktivität des Pflegeberufs aufgrund hoher Arbeitsbelastung im Alltag und schlechter Bezahlung, verstärken den Mangel an Pflegepersonal zusätzlich. Die vorliegende Situation macht deutlich, dass im Pflegebereich praktikable und umfassende Lösungen gefunden werden müssen. Ein Lösungsansatz hierfür ist der Einsatz von Methoden des Business Analytics und Operations Management. Diese sollen dazu beitragen, das Pflegepersonal zu entlasten und die Attraktivität des Pflegeberufs wieder zu erhöhen. Dieser Beitrag gibt einen Überblick über Business Analytics und Operations Management in der Klinik. Durch kleine Fallbeispiele der Pflegeprozesse sowie Optimierungs- und Simulationsmodelle soll aufgezeigt werden, dass diese Methoden schnell und einfach im Pflegebereich Unterstützung bieten können.
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- 2024
23. Combined exposure to bisphenol A and benzophenone-3 during early mouse pregnancy affects fetal development in a sex-dependent manner
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Fischer, Florence, Kretschmer, Tobias, Seifert, Paulina, Krieger, Elisabeth, Rödiger, Jonas, Howanski, Julia, Meyer, Nicole, Zenclussen, M.L., Schumacher, Anne, Zenclussen, Ana Claudia, Fischer, Florence, Kretschmer, Tobias, Seifert, Paulina, Krieger, Elisabeth, Rödiger, Jonas, Howanski, Julia, Meyer, Nicole, Zenclussen, M.L., Schumacher, Anne, and Zenclussen, Ana Claudia
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no abstract
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- 2024
24. Teaming up with nature : Policy advice for more nature-based solutions in the Nordics
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Gundersen Enge, Caroline, Skumlien Furuseth, Ingvild, Borgman, Elvira, Dubovik, Maria, Björk Gunnarsdóttir, Ásdís, Pehrsson, Victoria, Barkved, Line Johanne, Hlynsdóttir, Lára Hrönn, Ægisdóttir, Hafdís Hanna, Valinia, Salar, Egebæk, Sara Lisa, Engelbrecht Hansen, Amalie, Jørgensen, Kristian, Carmen, Antuña Rozado, Warsta, Lassi, Seifert-Dähnn, Isabel, Gundersen Enge, Caroline, Skumlien Furuseth, Ingvild, Borgman, Elvira, Dubovik, Maria, Björk Gunnarsdóttir, Ásdís, Pehrsson, Victoria, Barkved, Line Johanne, Hlynsdóttir, Lára Hrönn, Ægisdóttir, Hafdís Hanna, Valinia, Salar, Egebæk, Sara Lisa, Engelbrecht Hansen, Amalie, Jørgensen, Kristian, Carmen, Antuña Rozado, Warsta, Lassi, and Seifert-Dähnn, Isabel
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Nature-based solutions (NBS) are recognised as contributing to international climate and biodiversity goals as well as solving other major societal challenges. Still, there are barriers to using NBS in the Nordic countries. Well-designed policies and targeted policy instruments are needed to accelerate the uptake of NBS. The A-DVICE project has developed an online handbook featuring advice for mainstreaming the use of NBS through policies by exploring potential opportunities and examples in the Nordic countries. The project is part of the Nordic Council of Ministers' programme on NBS. The handbook is hosted online, at www.nbspolicy.org. This TemaNord report contains a compilation of its main content.
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- 2024
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25. A cohesive zone model for thermomechanical fatigue and fracture of metallic materials
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Kuna, Meinhard, Seifert, Thomas, Technische Universität Bergakademie Freiberg, Abraham, Jeffy Sabu, Kuna, Meinhard, Seifert, Thomas, Technische Universität Bergakademie Freiberg, and Abraham, Jeffy Sabu
- Abstract
Thermomechanical fatigue is a fatigue failure caused by combined thermal and mechanical loading cycles where both stresses and temperature can vary with time. A cohesive zone model simulates material failure within the finite element method by describing material behaviour and damage evolution through a traction-separation relation. In this work, a viscoplastic cohesive zone model is developed in order to describe the fatigue and fracture behaviour of high performance superalloys undergoing thermomechanical fatigue loading. A micromechanically motivated cohesive potential, incorporating fatigue and creep damage variables, is proposed and its thermodynamic consistency is established. The characteristic behaviour of the cohesive law during cyclic loading is described in terms of both traction and energy. The developed cohesive zone model is applied to simulate the lifetime behaviour in a smooth specimen. The effect of loading parameters such as temperature, dwell period, and strain rate on isothermal, in-phase and out-of-phase thermomechanical fatigue is successfully demonstrated. Using crack growth simulations in a boundary layer model, the relation between the local behaviour of the cohesive zone and fracture parameters like stress intensity factor, J-integral and crack tip opening displacement is established. The three stages of fatigue crack growth rate curves that are experimentally observed were obtained through simulations. Crack growth in a corner crack specimen is simulated under cyclic stress-controlled loading to obtain the experimentally observed crack profiles. Material parameters for the Nickel based superalloy MAR-M247 are identified using experimental data from the literature.
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- 2024
26. Impact of customized add-on nighttime bracing in full-time brace treatment of adolescent idiopathic scoliosis
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Bretschneider, Henriette, Bernstein, Peter, Disch, Alexander C., Seifert, Jens, Bretschneider, Henriette, Bernstein, Peter, Disch, Alexander C., and Seifert, Jens
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Study design Retrospective cohort study. Objective Bracing is an accepted standard therapy for idiopathic scoliosis at Cobb angle ranges between 25° and 40°. However, it is unclear, if a specifically tailored regimen of daytime and nighttime braces (= double brace) yields superior results compared to the standard treatment (single brace for day and night). Methods One-hundred-fifteen patients with adolescent idiopathic scoliosis (AIS) were assessed before initiation of bracing treatment and at the final follow-up 2 years after deposition of the brace. They were divided into two groups: double-brace group (n = 66, 4 male, 62 female, age 13.1 ± 1.9 (mean ± SD), primary curvature thoracic n = 35, lumbar n = 31) and single-brace group (n = 49, 8 male, 41 female, age 14.1 ± 1.9, primary curvature thoracic n = 18, lumbar n = 31). Each patient underwent clinical and radiological examinations and Cobb angles were measured. Results Both therapy regimens succeeded to either stop progression or improve scoliosis in over 85% of cases. The nighttime brace showed a significantly higher primary correction than the daytime brace. Nevertheless, there was no significant difference in treatment success in the 2-year follow-up (p = 0.58). Conclusion It seems to be sufficient to treat idiopathic scoliosis with one well-tailored brace for day- and nighttime.
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- 2024
27. Sauerstofftherapie und Atmungsunterstützung bei Patienten mit COVID-19: Entwicklung eines Punktesystems zur Vorhersage einer akuten hypoxämischen respiratorischen Insuffizienz
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Frille, Armin, Wald, Alexandra, Bercker, Sven, Fisser, Christoph, Universität Leipzig, Seifert, Richard, Frille, Armin, Wald, Alexandra, Bercker, Sven, Fisser, Christoph, Universität Leipzig, and Seifert, Richard
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- 2024
28. Resistance of HNSCC cell models to pan-FGFR inhibition depends on the EMT phenotype associating with clinical outcome
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Broghammer, F., Gouda, M., Korovina, I., Brunner, C., Coppes, R., Gires, O., Seifert, M., (0000-0001-5684-629X) Cordes, N., Broghammer, F., Gouda, M., Korovina, I., Brunner, C., Coppes, R., Gires, O., Seifert, M., and (0000-0001-5684-629X) Cordes, N.
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- 2024
29. Significant Correlation Between Cutaneous Abundance of Streptococcus and Psoriasis Severity in Patients with FBXL19 Gene Variants
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Assarsson, Malin, Söderman, Jan, Seifert, Oliver, Assarsson, Malin, Söderman, Jan, and Seifert, Oliver
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Psoriasis results from both genetic predisposition and environmental triggers, such as Streptococcal infections. This study aimed to explore the correlation between the abundance of the Streptococcus genus on the skin and psoriasis severity in individuals carrying specific psoriasis -associated genetic variants. Studying 39 chronic plaque psoriasis patients, the elbow skin microbiome and 49 psoriasis -related single nucleotide polymorphisms (SNPs) were analysed using a MiSeq instrument for 16S rDNA sequencing, and CLC Genomic Workbench for processing and analysis. Through multivariate linear regression analysis, a positive correlation was found between Streptococcus genus abundance and psoriasis severity in patients with certain FBXL19 gene -related heterozygous SNPs (rs12924903, rs10782001, rs12445568). Conversely, a negative association was observed in patients with homozygous genotypes. Moreover, we identified an association between Streptococcus abundance and psoriasis severity in patients with genetic variants related to IL -22, ERAP1, NOS2, and ILF3. This is the first study highlighting a positive association between Streptococcus skin colonization and psoriasis severity in patients with heterozygous genotypes within the FBXL19 gene region. FXBL19 targets the IL-33/IL1RL1 axis, crucial in infectious diseases and innate immunity promotion. These novel results suggests an intricate interaction among host genetics, Streptococcus skin colonization, and psoriasis inflammation, offering potential avenues for novel treatment approaches., Funding Agencies|Swedish Psoriasis Foundation; Futurum, The Academy of Healthcare, County Council of Jonkoping, Sweden
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- 2024
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30. First Indicator of Relapse in Testicular Cancer and Implications for Follow-up: Analysis of the Swiss Austrian German Testicular Cancer Cohort Study (SAG TCCS)
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Fischer, Stefanie, Gillessen, Silke, Stalder, Odile, Terbuch, Angelika, Cathomas, Richard, Schmid, Florian A, Zihler, Deborah, Müller, Beat, Fankhauser, Christian D, Hirschi-Blickenstorfer, Anita, Kluth, Luis Alex, Seifert, Bettina, Templeton, Arnoud J, Mingrone, Walter, Ufe, Mark-Peter, Fischer, Natalie, Beyer, Jörg, Woelky, Regina, Omlin, Aurelius, Vogl, Ursula, Hoppe, Katharina, Kamradt, Jörn, Rothschild, Sacha I, Rothermundt, Christian, Fischer, Stefanie, Gillessen, Silke, Stalder, Odile, Terbuch, Angelika, Cathomas, Richard, Schmid, Florian A, Zihler, Deborah, Müller, Beat, Fankhauser, Christian D, Hirschi-Blickenstorfer, Anita, Kluth, Luis Alex, Seifert, Bettina, Templeton, Arnoud J, Mingrone, Walter, Ufe, Mark-Peter, Fischer, Natalie, Beyer, Jörg, Woelky, Regina, Omlin, Aurelius, Vogl, Ursula, Hoppe, Katharina, Kamradt, Jörn, Rothschild, Sacha I, and Rothermundt, Christian
- Abstract
BACKGROUND AND OBJECTIVE Follow-up for patients with testicular cancer should ensure early detection of relapses. Optimal schedules and minimum requirements for cross-sectional imaging are not clearly defined, and guideline recommendations differ. Our aim was to analyse the clinical impact of different imaging modalities for detection of relapse in a large prospective cohort (Swiss Austrian German Testicular Cancer Cohort Study, SAG TCCS). METHODS Patients with seminoma or nonseminoma were prospectively enrolled between January 2014 and February 2023 after initial treatment (n = 1175). Follow-up according to the study schedule was individualised for histology and disease stage. Only patients who had received primary treatment were considered. We analysed the total number of imaging modalities and scans identifying relapse and the timing of relapse. KEY FINDINGS AND LIMITATIONS We analysed data for 1006 patients (64% seminoma, 36% nonseminoma); 76% had stage I disease. Active surveillance was the most frequent management strategy (65%). Recurrence occurred in 82 patients, corresponding to a 5-yr relapse-free survival rate of 90.1% (95% confidence interval 87.7-92.1%). Median follow-up for patients without relapse was 38.4 mo (interquartile range 21.6-61.0). Cross-sectional imaging of the abdomen was the most important indicator of relapse 57%, abdominal CT accounting for 46% and MRI for 11%. Marker elevation indicated relapse in 24% of cases. Chest X-ray was the least useful modality, indicating relapse in just 2% of cases. CONCLUSIONS AND CLINICAL IMPLICATIONS On the basis of findings from our prospective register, we have adapted a follow-up schedules with an emphasis on abdominal imaging and a reduction in chest X-rays. This schedule might provide additional guidance for clinicians and will be prospectively evaluated as SAG TCCS continues to enrol patients. PATIENT SUMMARY We analysed the value of different types of imaging scans for detection of relapse of testic
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- 2024
31. Expanding the spectrum of low-grade sinonasal adenocarcinoma with biphasic seromucinous differentiation and activating HRAS/AKT1 mutations
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Hadnagy, Viktoria S; https://orcid.org/0009-0001-8335-8731, Körner, Meike, Rössle, Matthias, Dubach, Patrick, Pabst, Gunther, Kotulova, Alexandra, Weder, Stefan, Seifert, Robert, Rushing, Elisabeth J; https://orcid.org/0000-0001-7616-6320, Holzmann, David; https://orcid.org/0000-0002-8176-8358, Hüllner, Martin; https://orcid.org/0000-0002-4849-3292, Freiberger, Sandra N; https://orcid.org/0000-0001-6874-9649, Rupp, Niels J; https://orcid.org/0000-0002-7043-3456, Hadnagy, Viktoria S; https://orcid.org/0009-0001-8335-8731, Körner, Meike, Rössle, Matthias, Dubach, Patrick, Pabst, Gunther, Kotulova, Alexandra, Weder, Stefan, Seifert, Robert, Rushing, Elisabeth J; https://orcid.org/0000-0001-7616-6320, Holzmann, David; https://orcid.org/0000-0002-8176-8358, Hüllner, Martin; https://orcid.org/0000-0002-4849-3292, Freiberger, Sandra N; https://orcid.org/0000-0001-6874-9649, and Rupp, Niels J; https://orcid.org/0000-0002-7043-3456
- Abstract
AIMS Low-grade non-intestinal-type sinonasal adenocarcinoma (LGSNAC) is a rare heterogeneous and poorly characterised group of tumours, distinct from intestinal- and salivary-type neoplasms. Therefore, further characterisation is needed for clearer biological understanding and classification. METHODS AND RESULTS Clinical, histological and molecular characterisation of four cases of biphasic, low-grade adenocarcinomas of the sinonasal tract was performed. All patients were male, aged between 48 and 78 years, who presented with polypoid masses in the nasal cavity. Microscopically, virtually all tumours were dominated by tubulo-glandular biphasic patterns, microcystic, focal (micro)papillary, oncocytic or basaloid features. Immunohistochemical staining confirmed biphasic differentiation with an outer layer of myoepithelial cells. Molecular profiling revealed HRAS (p.G13R, p.Q61R) mutations, and concomitant AKT1 (p.E17K, p.Q79R) mutations in two cases. Two cases showed potential in-situ/precursor lesions adjacent to the tumour. Follow-up periods ranged from 1 to 30 months, with one case relapsing locally after 12 and > 20 years. CONCLUSION This study further corroborates a distinct biphasic low-grade neoplasm of the sinonasal tract with seromucinous differentiation. Although morphological and molecular features overlap with salivary gland epithelial-myoepithelial carcinoma, several arguments favour categorising these tumours within the spectrum of LGSNAC.
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- 2024
32. Review: interactions between microplastics and the gastrointestinal microbiome
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Eichinger, Julia; https://orcid.org/0009-0002-2549-0811, Tretola, Marco; https://orcid.org/0000-0003-3317-4384, Seifert, Jana; https://orcid.org/0000-0002-7690-8539, Brugger, Daniel; https://orcid.org/0000-0001-7267-0335, Eichinger, Julia; https://orcid.org/0009-0002-2549-0811, Tretola, Marco; https://orcid.org/0000-0003-3317-4384, Seifert, Jana; https://orcid.org/0000-0002-7690-8539, and Brugger, Daniel; https://orcid.org/0000-0001-7267-0335
- Abstract
Plastics are ubiquitous materials in our daily lives, but their inadequate disposal has led to the widespread distribution of their micro- and nanoparticles in various ecosystems. Their detection in feed and food, as well as in livestock and human stool samples, strongly suggests a continuous circulation in the feed and food chain. The ability of plastic particles to penetrate the intestinal barrier determines their accumulation in the body and in food of animal origin. The gastrointestinal (GI) microbiome, whose fermentation activity can influence the particle size distribution of certain plastic materials and which is known to modulate the permeability of the intestinal barrier, may be a critical hub in this transfer. This review attempts to summarise research efforts to date on the interaction between microplastics (MPs) and the GI microbiome of humans, mice, chickens and aquatic animals. We have analysed the state of knowledge and identified future avenues for targeted research approaches to answer open questions regarding the interaction of plastic particles with the GI microbiome, which may help to develop predictive models for the accumulation of plastic particles from feed and food in the body and animal products, respectively.
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- 2024
33. Changes in tumor-to-blood ratio as a prognostic marker for progression-free survival and overall survival in neuroendocrine tumor patients undergoing PRRT.
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Weber, Manuel, Pettersson, Olof, Seifert, Robert, Schaarschmidt, Benedikt M, Fendler, Wolfgang P, Rischpler, Christoph, Lahner, Harald, Herrmann, Ken, Sundin, Anders, Weber, Manuel, Pettersson, Olof, Seifert, Robert, Schaarschmidt, Benedikt M, Fendler, Wolfgang P, Rischpler, Christoph, Lahner, Harald, Herrmann, Ken, and Sundin, Anders
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BACKGROUND: Historically, patient selection for peptide receptor radionuclide therapy (PRRT) has been performed by virtue of somatostatin receptor scintigraphy (SRS). In recent years, somatostatin receptor positron emission tomography (SSTR-PET) has gradually replaced SRS because of its improved diagnostic capacity, creating an unmet need for SSTR-PET-based selection criteria for PRRT. Tumor-to-blood ratio (TBR) measurements have shown high correlation with the net influx rate Ki, reflecting the tumor somatostatin receptor expression, to a higher degree than standardized uptake value (SUV) measurements. TBR may therefore predict treatment response to PRRT. In addition, changes in semiquantitative SSTR-PET parameters have been shown to predate morphological changes, making them a suitable metric for response assessment. METHODS: The institutional database of the Department of Nuclear Medicine (University Hospital Essen) was searched for NET patients undergoing ≥ 2 PRRT cycles with available baseline and follow-up SSTR-PET. Two blinded independent readers reported the occurrence of new lesions quantified tumor uptake of up to nine lesions per patient using SUV and TBR. The association between baseline TBR and changes in uptake/occurrence of new lesions with progression-free survival (PFS) and overall survival (OS) was tested by use of a Cox regression model and log-rank test. RESULTS: Patients with baseline TBR in the 1st quartile had a shorter PFS (14.4 months) than those in the 3rd (23.7 months; p = 0.03) and 4th (24.1 months; p = 0.02) quartile. Similarly, these patients had significantly shorter OS (32.5 months) than those with baseline TBR in the 2nd (41.8 months; p = 0.03), 3rd (69.2 months; p < 0.01), and 4th (42.7 months; p = 0.03) quartile. Baseline to follow-up increases in TBR were independently associated with shorter PFS when accounting for prognostic markers, e.g., RECIST response (hazard ratio = 2.91 [95%CI = 1.54-5.50]; p = 0.01). This was confirmed
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- 2024
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34. Towards a comprehensive analysis of agricultural land systems: What can we see with publicly available datasets in the EU and US?
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Burchfield, Emily, Ferro, Marco, Hüttel, Silke, Lakes, Tobia, Leonhardt, Heidi, Niedermayr, Andreas, Rissing, Andrea, Seifert, Stefan, Wesemeyer, Maximilian, Burchfield, Emily, Ferro, Marco, Hüttel, Silke, Lakes, Tobia, Leonhardt, Heidi, Niedermayr, Andreas, Rissing, Andrea, Seifert, Stefan, and Wesemeyer, Maximilian
- Abstract
Understanding agricultural land systems is paramount to preparing for future transitions under climate change. A first step in moving towards a systematic, multi-context comparison of agricultural land systems is an assessment of data availability and commensurability. We compare publicly available and publicly curated data describing agricultural land systems—those devoted to the production of food, fuel, and fiber—to map analytical potential for comparative research in the United States (US) and European Union (EU). We discuss how political priorities shape what we can(not) see in each region and articulate future data needs to support cross-context understanding of agricultural land systems dynamics. This comprehensive understanding of how and why agricultural land systems change is imperative to promoting sustainable, resilient, and just agriculture futures.
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- 2024
35. Die langfristigen Auswirkungen von Frühgeburtlichkeit auf die Struktur des Hypothalamus und deren Rolle für die Entwicklung des Körpergewichtes
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Sorg, Christian Franz (Priv.-Doz. Dr.), Sorg, Christian Franz (Priv.-Doz. Dr.);Bronger, Holger (Priv.-Doz. Dr.);Seifert-Klauss, Vanadin Regina (Prof. Dr.), Ruzok, Tobias, Sorg, Christian Franz (Priv.-Doz. Dr.), Sorg, Christian Franz (Priv.-Doz. Dr.);Bronger, Holger (Priv.-Doz. Dr.);Seifert-Klauss, Vanadin Regina (Prof. Dr.), and Ruzok, Tobias
- Abstract
Die vorliegende Arbeit findet in sehr frühgeborenen Erwachsenen verkleinerte Volumina von Hypothalamuskernen, die an der Regulation des Körpergewichtes beteiligt sind. Veränderte Körpergewichtsentwicklungen nach Frühgeburt korrelieren mit Volumenveränderungen in relevanten Hypothalamuskernen im Erwachsenenalter., The present work demonstrates lower volumes of hypothalamus subunits involved in body weight control in very premature born adults. Altered body weight trajectories after premature birth correlate with volumetric changes of relevant hypothalamus nuclei in adulthood.
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- 2024
36. Differentiable Modeling for Computational Imaging
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Seifert, Jacob and Seifert, Jacob
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This thesis explores advancements in computational imaging methods that enable lensless, phase-sensitive microscopy, wavefront sensing, and metrology applications. By using overlapping regions illuminated by a probe beam, interference pattern measurements allow for computational reconstruction of objects through iterative algorithms. The focus is on enhancing these reconstructions using differentiable modeling of the underlying physics. This approach allows for the joint optimization of various parameters and the integration of deep learning techniques. The goal is to increase the flexibility and robustness of computational imaging for various applications, particularly under challenging experimental conditions. The significance is particularly evident in the semiconductor industry, where nanoscale imaging is critical due to shrinking feature sizes in computer chips. With transistor dimensions approaching a few nanometers, traditional metrology faces significant challenges. Extreme Ultraviolet (EUV) light, with wavelengths around 13.5 nm, is used in semiconductor manufacturing but is absorbed or poorly refracted by most materials, making lenses impractical. Computational lensless imaging provides high-resolution, non-destructive imaging of nanoscale structures on semiconductor wafers, addressing a key metrology need.
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- 2024
37. Noise-robust latent vector reconstruction in ptychography using deep generative models
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Seifert, Jacob, Shao, Yifeng, Mosk, Allard P., Seifert, Jacob, Shao, Yifeng, and Mosk, Allard P.
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Computational imaging is increasingly vital for a broad spectrum of applications, ranging from biological to material sciences. This includes applications where the object is known and sufficiently sparse, allowing it to be described with a reduced number of parameters. When no explicit parameterization is available, a deep generative model can be trained to represent an object in a low-dimensional latent space. In this paper, we harness this dimensionality reduction capability of autoencoders to search for the object solution within the latent space rather than the object space. We demonstrate what we believe to be a novel approach to ptychographic image reconstruction by integrating a deep generative model obtained from a pre-trained autoencoder within an automatic differentiation ptychography (ADP) framework. This approach enables the retrieval of objects from highly ill-posed diffraction patterns, offering an effective method for noise-robust latent vector reconstruction in ptychography. Moreover, the mapping into a low-dimensional latent space allows us to visualize the optimization landscape, which provides insight into the convexity and convergence behavior of the inverse problem. With this work, we aim to facilitate new applications for sparse computational imaging such as when low radiation doses or rapid reconstructions are essential.
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- 2024
38. Resistance of HNSCC cell models to pan-FGFR inhibition depends on the EMT phenotype associating with clinical outcome
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Hubrecht Institute with UMC, Broghammer, Felix, Korovina, Irina, Gouda, Mahesh, Celotti, Martina, van Es, Johan, Lange, Inga, Brunner, Cornelia, Mircetic, Jovan, Coppes, Robert P., Gires, Olivier, Dahl, Andreas, Seifert, Michael, Cordes, Nils, Hubrecht Institute with UMC, Broghammer, Felix, Korovina, Irina, Gouda, Mahesh, Celotti, Martina, van Es, Johan, Lange, Inga, Brunner, Cornelia, Mircetic, Jovan, Coppes, Robert P., Gires, Olivier, Dahl, Andreas, Seifert, Michael, and Cordes, Nils
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- 2024
39. Predicting the next pandemic: VACCELERATE ranking of the World Health Organization's Blueprint for Action to Prevent Epidemics
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Hart- en Vaatziekten Team A, Epi Infectieziekten Team 1, Child Health, Infection & Immunity, JC onderzoeksprogramma Infectious Diseases, MMB Medische Staf, Salmanton-García, Jon, Wipfler, Pauline, Leckler, Janina, Nauclér, Pontus, Mallon, Patrick W., Bruijning-Verhagen, Patricia C.J.L., Schmitt, Heinz Joseph, Bethe, Ullrich, Olesen, Ole F., Stewart, Fiona A., Albus, Kerstin, Cornely, Oliver A., Busch, Martin, Seifert, Ulrike, Widmer, Andreas, Nagao, Miki, Rello, Jordi, Todorova, Tatina, Cviljević, Sabina, Heath, Christopher H., Jančorienė, Ligita, Fischer, Thea Koelsen, Orth, Hans Martin, Johansen, Isik Somuncu, Doymaz, Mehmet, Tragiannidis, Athanasios, Löscher, Thomas, Xu, Jin Fu, Husa, Petr, Oteo, José Antonio, Issack, Mohammad I., Zeitlinger, Markus, Le Grand, Roger, Zdziarski, Przemysław, Demirkan, Fatih, Amador, Paloma Merino, García-Lozano, Tomás, Cao, Qing, Vázquez, Lourdes, Caeiro, Juan Pablo, Hermans, Peter, Nahrwar, Shahroch, Avsar, Korkut, Kumar, Deepak, Fernández, Norma, Mardani, Masoud, Segal, Esther, Pan, Angelo, Gkentzi, Despoina, Gioula, Georgia, Cortés, Jorge Alberto, Oliveira, Joaquim, van Damme, Pierre, Bin Mohd Zaili, Mohd Zaki, Antinori, Spinello, Zablockienė, Birutė, Papazisis, Georgios, Aneke, Chioma Inyang, Valerio, Maricela, McConkey, Samuel, Aujayeb, Avinash, Azzini, Anna Maria, Roganović, Jelena, Greve-Isdahl Mohn, Kristin, Kremsner, Peter, Gkrania-Klotsas, Effrossyni, Corzo, Dora, Khanna, Nina, Smiatacz, Tomasz, Scheithauer, Simone, Merelli, Maria, Klempa, Boris, Vrḫovac, Radovan, Ruggiero, Antonio, Chaudhary, Pankaj, Maquera-Afaray, Julio, Ekkelenkamp, Miquel, Jindra, Pavel, Pantić, Nikola, Guerra, Gemma Jiménez, Weiss, Guenter, Roohi, Behrad, Argyropoulos, Christos D., Silfverdal, Sven Aprne, van Praet, Jens, Bal, Zumrut Sahbudak, Kanj, Souha, Young, Barnaby, Pana, Zoi Dorothea, Roilides, Emmanuel, Stearns, Stephen C., Wauters, Joost, Baño, Jesús Rodríguez, Pletz, Mathias W., Travar, Maja, Kühn, Steven, Riera, Fernando, Cornely, Daniel, Laura, Vlad Jeni, Koehler, Philipp, Eley, Brian, Nair, Pravin K., Ciesek, Sandra, Olaru, Ioana Diana, Marques, Laura, Pontali, Emanuele, Naunheim, Alexandra, Lieb, Adrian, Gerhard, Markus, Farooqi, Joveria Qais, Turtle, Lance, Méndez, Gustavo Adolfo, Cox, Rebecca Jane, Goodman, Nigel, Caceca, Billie, Pemán, Javier, Dawood, Halima, Askling, Helena Hervius, Fomsgaard, Anders, Hernández, Alejandra Calderón, Staehelin, Cornelia, Liu, Chia Ying, Icardi, Giancarlo, Castagnola, Elio, Salzer, Helmut J.F., Lundgren, Jens, Javadli, Samir, Forghieri, Fabio, Hart- en Vaatziekten Team A, Epi Infectieziekten Team 1, Child Health, Infection & Immunity, JC onderzoeksprogramma Infectious Diseases, MMB Medische Staf, Salmanton-García, Jon, Wipfler, Pauline, Leckler, Janina, Nauclér, Pontus, Mallon, Patrick W., Bruijning-Verhagen, Patricia C.J.L., Schmitt, Heinz Joseph, Bethe, Ullrich, Olesen, Ole F., Stewart, Fiona A., Albus, Kerstin, Cornely, Oliver A., Busch, Martin, Seifert, Ulrike, Widmer, Andreas, Nagao, Miki, Rello, Jordi, Todorova, Tatina, Cviljević, Sabina, Heath, Christopher H., Jančorienė, Ligita, Fischer, Thea Koelsen, Orth, Hans Martin, Johansen, Isik Somuncu, Doymaz, Mehmet, Tragiannidis, Athanasios, Löscher, Thomas, Xu, Jin Fu, Husa, Petr, Oteo, José Antonio, Issack, Mohammad I., Zeitlinger, Markus, Le Grand, Roger, Zdziarski, Przemysław, Demirkan, Fatih, Amador, Paloma Merino, García-Lozano, Tomás, Cao, Qing, Vázquez, Lourdes, Caeiro, Juan Pablo, Hermans, Peter, Nahrwar, Shahroch, Avsar, Korkut, Kumar, Deepak, Fernández, Norma, Mardani, Masoud, Segal, Esther, Pan, Angelo, Gkentzi, Despoina, Gioula, Georgia, Cortés, Jorge Alberto, Oliveira, Joaquim, van Damme, Pierre, Bin Mohd Zaili, Mohd Zaki, Antinori, Spinello, Zablockienė, Birutė, Papazisis, Georgios, Aneke, Chioma Inyang, Valerio, Maricela, McConkey, Samuel, Aujayeb, Avinash, Azzini, Anna Maria, Roganović, Jelena, Greve-Isdahl Mohn, Kristin, Kremsner, Peter, Gkrania-Klotsas, Effrossyni, Corzo, Dora, Khanna, Nina, Smiatacz, Tomasz, Scheithauer, Simone, Merelli, Maria, Klempa, Boris, Vrḫovac, Radovan, Ruggiero, Antonio, Chaudhary, Pankaj, Maquera-Afaray, Julio, Ekkelenkamp, Miquel, Jindra, Pavel, Pantić, Nikola, Guerra, Gemma Jiménez, Weiss, Guenter, Roohi, Behrad, Argyropoulos, Christos D., Silfverdal, Sven Aprne, van Praet, Jens, Bal, Zumrut Sahbudak, Kanj, Souha, Young, Barnaby, Pana, Zoi Dorothea, Roilides, Emmanuel, Stearns, Stephen C., Wauters, Joost, Baño, Jesús Rodríguez, Pletz, Mathias W., Travar, Maja, Kühn, Steven, Riera, Fernando, Cornely, Daniel, Laura, Vlad Jeni, Koehler, Philipp, Eley, Brian, Nair, Pravin K., Ciesek, Sandra, Olaru, Ioana Diana, Marques, Laura, Pontali, Emanuele, Naunheim, Alexandra, Lieb, Adrian, Gerhard, Markus, Farooqi, Joveria Qais, Turtle, Lance, Méndez, Gustavo Adolfo, Cox, Rebecca Jane, Goodman, Nigel, Caceca, Billie, Pemán, Javier, Dawood, Halima, Askling, Helena Hervius, Fomsgaard, Anders, Hernández, Alejandra Calderón, Staehelin, Cornelia, Liu, Chia Ying, Icardi, Giancarlo, Castagnola, Elio, Salzer, Helmut J.F., Lundgren, Jens, Javadli, Samir, and Forghieri, Fabio
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- 2024
40. Transkriptomische Analyse von molekularen Faktoren zur Vorhersage des Therapieoutcomes nach 177Lu-PSMA-Radioligandentherapie
- Author
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Handke, A, Kesch, C, Fendler, W, Telli, T, Davicioni, E, Weiner, A, Lückerath, K, Herrmann, K, Hadaschik, B, Seifert, R, Handke, A, Kesch, C, Fendler, W, Telli, T, Davicioni, E, Weiner, A, Lückerath, K, Herrmann, K, Hadaschik, B, and Seifert, R
- Published
- 2024
41. Behavioral barriers impede pro-environmental decision-making: Experimental evidence from incentivized laboratory and vignette studies
- Author
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Hoffmann, R., Kanitsar, G., Seifert, M., Hoffmann, R., Kanitsar, G., and Seifert, M.
- Abstract
Despite increasing concerns about climate change, many people struggle to translate their pro-environmental values into action. Here, we explore the origins of this value-action gap focusing on the role of behavioral barriers that are characteristic for many environmentally relevant decisions. Using incentivized online laboratory and vignette experiments, we find that individuals are less likely to behave in accordance with their environmental values if they are not immediately affected by the consequences of their actions, if the impacts of their actions are uncertain, and if they contribute only marginally to the outcome. The behavioral barriers also exert an indirect effect on environmental behavior by undermining reciprocity and positive peer effects. The value-action gaps are correlated across the different experimental settings with men and younger participants showing a particularly large gap. These insights are important for climate communication and education, highlighting the important role of the perceived relevance and potential consequences of personal behaviors in collective action.
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- 2024
- Full Text
- View/download PDF
42. Wavelength-multiplexed multi-mode EUV reflection ptychography based on automatic differentiation
- Author
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Shao, Yifeng, Weerdenburg, Sven, Seifert, Jacob, Urbach, H. Paul, Mosk, Allard P., Coene, Wim, Shao, Yifeng, Weerdenburg, Sven, Seifert, Jacob, Urbach, H. Paul, Mosk, Allard P., and Coene, Wim
- Abstract
Ptychographic extreme ultraviolet (EUV) diffractive imaging has emerged as a promising candidate for the next generationmetrology solutions in the semiconductor industry, as it can image wafer samples in reflection geometry at the nanoscale. This technique has surged attention recently, owing to the significant progress in high-harmonic generation (HHG) EUV sources and advancements in both hardware and software for computation. In this study, a novel algorithm is introduced and tested, which enables wavelength-multiplexed reconstruction that enhances the measurement throughput and introduces data diversity, allowing the accurate characterisation of sample structures. To tackle the inherent instabilities of the HHG source, a modal approach was adopted, which represents the cross-density function of the illumination by a series of mutually incoherent and independent spatial modes. The proposed algorithm was implemented on a mainstream machine learning platform, which leverages automatic differentiation to manage the drastic growth in model complexity and expedites the computation using GPU acceleration. By optimising over 200 million parameters, we demonstrate the algorithm's capacity to accommodate experimental uncertainties and achieve a resolution approaching the diffraction limit in reflection geometry. The reconstruction of wafer samples with 20-nm high patterned gold structures on a silicon substrate highlights our ability to handle complex physical interrelations involving a multitude of parameters. These results establish ptychography as an efficient and accurate metrology tool.
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- 2024
43. Differentiable Modeling for Computational Imaging
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Mosk, A.P., Oosten, D. van, Seifert, Jacob, Mosk, A.P., Oosten, D. van, and Seifert, Jacob
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- 2024
44. Studying the Impact of European Union Regulatory Interventions for Minimising Risks From Medicines:Lessons Learnt and Recommendations
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Goedecke, Thomas, Martirosyan, Liana, Gault, Nathalie, Seifert, Karin, Morales, Daniel R, Bahri, Priya, Strassmann, Valerie, Huber, Martin, Straus, Sabine, Goedecke, Thomas, Martirosyan, Liana, Gault, Nathalie, Seifert, Karin, Morales, Daniel R, Bahri, Priya, Strassmann, Valerie, Huber, Martin, and Straus, Sabine
- Abstract
Purpose: The European Medicines Agency's (EMA) Pharmacovigilance Risk Assessment Committee (PRAC) launched a strategy to examine the public health impact of major regulatory interventions aimed at minimising risks of medicinal products. We conducted a lessons learnt analysis of impact studies completed between 2015 and 2023. Methods: We surveyed PRAC Sponsors and (Co-)Rapporteurs involved in the evaluation of 12 impact studies (10 commissioned by EMA and 2 conducted collaboratively by Member States) to explore how these support regulatory decision-making. Questions covered achievement of study objectives, risk minimisation effectiveness, added value for regulatory decision-making, and recommendations for future impact studies. Themes were generated using thematic content analysis. Results: Survey responses from 15 PRAC Sponsors and (Co-)Rapporteurs from 10 European Union Member States were included in the analysis. Among four cross-sectional surveys and eight drug utilisation studies, 50% achieved all objectives, the other studies partially due to limitations. Two studies concluded that risk minimisation measures were overall effective, two were effective with variation across countries, two were partially effective and four studies showed limited effectiveness. Two studies were deemed inconclusive due to limitations. The reasons for the limited effectiveness of risk minimisation may be explored using mixed-method approaches. Assessment of study feasibility and a priori discussion of effectiveness measurements is important. Conclusion: Despite limitations, impact research adds value to regulatory decision-making by addressing knowledge gaps and providing additional information on unintended consequences of regulatory interventions. Our recommendations will help to improve planning, conducting and interpretating future impact studies.
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- 2024
45. Phylogenetic diversity and community wide-trait means offer different insights into mechanisms regulating aboveground carbon storage
- Author
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Mensah, Sylvanus, Dimobe, Kangbéni, Noulèkoun, Florent, van der Plas, Fons, Seifert, Thomas, Mensah, Sylvanus, Dimobe, Kangbéni, Noulèkoun, Florent, van der Plas, Fons, and Seifert, Thomas
- Abstract
Both attributes of functional traits and phylogenetic diversity influence ecosystem functions, but which of these factors is most important is still poorly understood in natural systems. Using data from West African forests and tree savannas, we analyse how (i) phylogenetic diversity complements attributes of functional traits in explaining aboveground carbon (AGC); (ii) phylogenetic diversity relates with attributes of functional traits along gradients of phylogenetic signal; and (iii) pathways between phylogenetic diversity and attributes of functional traits relate AGC to soil and climate. Phylogenetic diversity was measured as standardised effect size of Mean Pairwise Distance (sesMPD) and Mean Nearest Taxon Distance (sesMNTD). Functional dispersion (FDis) and community weighted mean (CWM) were calculated for four traits related to leaf economics spectrum and plant life-history. Functional traits-based models explained 11 % of AGC variability. With two out of the four traits being phylogenetically conserved, incorporating phylogenetic diversity in the models increased the explained variance in AGC by 15 %. The slope of phylogenetic diversity-trait relationship was more responsive to trait conservatism for FDis than CWM. AGC was positively influenced by sesMPD and CWM of plant maximum height. In turn, CWM of plant maximum height increased with higher soil nitrogen and climate moisture, whereas sesMPD was negatively related with climate moisture. Although FDis was positively associated with sesMPD, it was not as important as sesMPD and CWM of plant maximum height in influencing and relating AGC to soil nitrogen and climate moisture. Our results suggest that phylogenetic diversity is important for AGC but does not fully reflect the functional mechanisms pertaining to community-wide trait means. The study also demonstrates the role of environment in regulating AGC, which operates through differences in community fitness driven by tall plant stature, and evolutionary
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- 2024
46. Hidden Markov Models for personalized identification of genome-wide gene expression differences between patient-matched melanoma metastasis pairs
- Author
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Kraft, T, Grützmann, K, Meinhardt, M, Meier, F, Westphal, D, Seifert, M, Kraft, T, Grützmann, K, Meinhardt, M, Meier, F, Westphal, D, and Seifert, M
- Published
- 2024
47. Ergebnisse der Sächsischen Brustkrebsinitiative (SBKI)
- Author
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Glaubitz, R, Seifert, M, Hamm, K, Kunath, H, Müller, G, Glaubitz, R, Seifert, M, Hamm, K, Kunath, H, and Müller, G
- Published
- 2024
48. Motivationale Faktoren und potenzielle Hürden für die Teilnahme an digitalen Präventionskursen - eine qualitative Interview-Studie mit AOK-Nordost und AOK-Nordwest Versicherten
- Author
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Wyrobnik, M, Seifert, F, May, S, Fleige, G, Lehnen, M, Wyrobnik, M, Seifert, F, May, S, Fleige, G, and Lehnen, M
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- 2024
49. Einstellungen, Potentiale und Herausforderungen von Apps in der Hypertonieversorgung - Ergebnisse einer Fragebogenerhebung unter Hausärzt:innen in Berlin/Brandenburg
- Author
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Seifert, F, May, S, Mühlensiepen, F, Voß, K, Heinze, M, Bruch, D, Spethmann, S, Seifert, F, May, S, Mühlensiepen, F, Voß, K, Heinze, M, Bruch, D, and Spethmann, S
- Published
- 2024
50. Erfahrungen zum Einsatz von GKV-Routinedaten bei der Evaluation von neuen Versorgungsformen für Menschen mit psychischen Erkrankungen
- Author
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Neumann, A, Kliemt, R, Baum, F, Seifert, M, Kubat, D, March, S, Swart, E, Schmitt, J, Neumann, A, Kliemt, R, Baum, F, Seifert, M, Kubat, D, March, S, Swart, E, and Schmitt, J
- Published
- 2024
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