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Year of publication
Institute
- IfB - Institut für Bioengineering (564) (remove)
Has Fulltext
- no (564) (remove)
Language
- English (564) (remove)
Document Type
- Article (391)
- Conference Proceeding (110)
- Part of a Book (34)
- Doctoral Thesis (17)
- Book (7)
- Other (3)
- Patent (1)
- Talk (1)
Keywords
- solar sail (5)
- CellDrum (3)
- GOSSAMER-1 (3)
- MASCOT (3)
- Biocomposites (2)
- Iterative learning control (2)
- Limit analysis (2)
- Mars (2)
- Natural fibres (2)
- Polymer-matrix composites (2)
Kowalski, Julia ; Linder, Peter ; Zierke, S. ; Wulfen, B. van ; Clemens, J. ; Konstantinidis, K. ; Ameres, G. ; Hoffmann, R. ; Mikucki, J. ; Tulaczyk, S. ; Funke, O. ; Blandfort, D. ; Espe, Clemens ; Feldmann, Marco ; Francke, Gero ; Hiecker, S. ; Plescher, Engelbert ; Schöngarth, Sarah ; Dachwald, Bernd ; Digel, Ilya ; Artmann, Gerhard ; Eliseev, D. ; Heinen, D. ; Scholz, F. ; Wiebusch, C. ; Macht, S. ; Bestmann, U. ; Reineking, T. ; Zetzsche, C. ; Schill, K. ; Förstner, R. ; Niedermeier, H. ; Szumski, A. ; Eissfeller, B. ; Naumann, U. ; Helbing, K.
The Saturnian moon Enceladus with its extensive water bodies underneath a thick ice sheet cover is a potential candidate for extraterrestrial life. Direct exploration of such extraterrestrial aquatic ecosystems requires advanced access and sampling technologies with a high level of autonomy. A new technological approach has been developed as part of the collaborative research project Enceladus Explorer (EnEx). The concept is based upon a minimally invasive melting probe called the IceMole. The force-regulated, heater-controlled IceMole is able to travel along a curved trajectory as well as upwards. Hence, it allows maneuvers which may be necessary for obstacle avoidance or target selection. Maneuverability, however, necessitates a sophisticated on-board navigation system capable of autonomous operations. The development of such a navigational system has been the focal part of the EnEx project. The original IceMole has been further developed to include relative positioning based on in-ice attitude determination, acoustic positioning, ultrasonic obstacle and target detection integrated through a high-level sensor fusion. This paper describes the EnEx technology and discusses implications for an actual extraterrestrial mission concept.
Kozhalakova, A. A. ; Zhubanova, Azhar A. ; Mansurov, Z. A. ; Digel, Ilya ; Tazhibayeva, S. M. ; Artmann, Gerhard ; Temiz Artmann, Aysegül
Krämer, Stefan ; Daab, Dominique Jonas ; Müller, Brigitte ; Wagner, Tobias ; Baader, Fabian ; Hessel, Joana ; Gdalewitsch, Georg ; Plescher, Engelbert ; Dachwald, Bernd ; Wahle, Michael ; Gierse, Andreas ; Vetter, Rudolf ; Pfützenreuter, Lysan
Kuchler, Timon ; Günthner, Roman ; Ribeiro, Andrea ; Hausinger, Renate ; Streese, Lukas ; Wöhnl, Anna ; Kesseler, Veronika ; Negele, Johanna ; Assali, Tarek ; Carbajo-Lozoya, Javier ; Lech, Maciej ; Adorjan, Kristina ; Stubbe, Hans Christian ; Hanssen, Henner ; Kotliar, Konstantin ; Haller, Berhard ; Heemann, Uwe ; Schmaderer, Christoph
Background
Post-COVID-19 syndrome (PCS) is a lingering disease with ongoing symptoms such as fatigue and cognitive impairment resulting in a high impact on the daily life of patients. Understanding the pathophysiology of PCS is a public health priority, as it still poses a diagnostic and treatment challenge for physicians.
Methods
In this prospective observational cohort study, we analyzed the retinal microcirculation using Retinal Vessel Analysis (RVA) in a cohort of patients with PCS and compared it to an age- and gender-matched healthy cohort (n = 41, matched out of n = 204).
Measurements and main results
PCS patients exhibit persistent endothelial dysfunction (ED), as indicated by significantly lower venular flicker-induced dilation (vFID; 3.42% ± 1.77% vs. 4.64% ± 2.59%; p = 0.02), narrower central retinal artery equivalent (CRAE; 178.1 [167.5–190.2] vs. 189.1 [179.4–197.2], p = 0.01) and lower arteriolar-venular ratio (AVR; (0.84 [0.8–0.9] vs. 0.88 [0.8–0.9], p = 0.007). When combining AVR and vFID, predicted scores reached good ability to discriminate groups (area under the curve: 0.75). Higher PCS severity scores correlated with lower AVR (R = − 0.37 p = 0.017). The association of microvascular changes with PCS severity were amplified in PCS patients exhibiting higher levels of inflammatory parameters.
Conclusion
Our results demonstrate that prolonged endothelial dysfunction is a hallmark of PCS, and impairments of the microcirculation seem to explain ongoing symptoms in patients. As potential therapies for PCS emerge, RVA parameters may become relevant as clinical biomarkers for diagnosis and therapy management.
Kuerten, David ; Kotliar, Konstantin ; Fuest, Matthias ; Walter, Peter ; Hollstein, Muriel ; Plange, Niklas
Purpose Vascular risk factors and ocular perfusion are heatedly discussed in the pathogenesis of glaucoma. The retinal vessel analyzer (RVA, IMEDOS Systems, Germany) allows noninvasive measurement of retinal vessel regulation. Significant differences especially in the veins between healthy subjects and patients suffering from glaucoma were previously reported. In this pilot-study we investigated if localized vascular regulation is altered in glaucoma patients with altitudinal visual field defect asymmetry. Methods 15 eyes of 12 glaucoma patients with advanced altitudinal visual field defect asymmetry were included. The mean defect was calculated for each hemisphere separately (-20.99 ± 10.49 pro- found hemispheric visual field defect vs -7.36 ± 3.97 dB less profound hemisphere). After pupil dilation, RVA measurements of retinal arteries and veins were conducted using the standard protocol. The superior and inferior retinal vessel reactivity were measured consecutively in each eye. Results Significant differences were recorded in venous vessel constriction after flicker light stimulation and overall amplitude of the reaction (p \ 0.04 and p \ 0.02 respectively) in-between the hemispheres spheres. Vessel reaction was higher in the hemisphere corresponding to the more advanced visual field defect. Arterial diameters reacted similarly, failing to reach statistical significance. Conclusion Localized retinal vessel regulation is significantly altered in glaucoma patients with asymmetri altitudinal visual field defects. Veins supplying the hemisphere concordant to a less profound visual field defect show diminished diameter changes. Vascular dysregulation might be particularly important in early glaucoma stages prior to a significant visual field defect.
Kurulgan Demirci, Eylem ; Demirci, T. ; Trzewik, Jürgen ; Linder, Peter ; Karakulah, G. ; Artmann, Gerhard ; Sakizli, M. ; Temiz Artmann, Aysegül
Kurulgan Demirci, Eylem ; Demirci, Taylan ; Linder, Peter ; Trzewik, Jürgen ; Gierkowski, Jessica Ricarda ; Gossmann, Matthias ; Kayser, Peter ; Porst, Dariusz ; Digel, Ilya ; Artmann, Gerhard ; Temiz Artmann, Aysegül
All cells generate contractile tension. This strain is crucial for mechanically controlling the cell shape, function and survival. In this study, the CellDrum technology quantifying cell's (the cellular) mechanical tension on a pico-scale was used to investigate the effect of lipopolysaccharide (LPS) on human aortic endothelial cell (HAoEC) tension. The LPS effect during gram-negative sepsis on endothelial cells is cell contraction causing endothelium permeability increase. The aim was to finding out whether recombinant activated protein C (rhAPC) would reverse the endothelial cell response in an in-vitro sepsis model. In this study, the established in-vitro sepsis model was confirmed by interleukin 6 (IL-6) levels at the proteomic and genomic levels by ELISA, real time-PCR and reactive oxygen species (ROS) activation by florescence staining. The thrombin cellular contraction effect on endothelial cells was used as a positive control when the CellDrum technology was applied. Additionally, the Ras homolog gene family, member A (RhoA) mRNA expression level was checked by real time-PCR to support contractile tension results. According to contractile tension results, the mechanical predominance of actin stress fibers was a reason of the increased endothelial contractile tension leading to enhanced endothelium contractility and thus permeability enhancement. The originality of this data supports firstly the basic measurement principles of the CellDrum technology and secondly that rhAPC has a beneficial effect on sepsis influenced cellular tension. The technology presented here is promising for future high-throughput cellular tension analysis that will help identify pathological contractile tension responses of cells and prove further cell in-vitro models.