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- Özer, B. (1)
- Čapek, J. (1)
- Šimić, A. (1)
- Štefančič, A. (1)
Erscheinungsjahr
- 2022 (340) (entfernen)
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- Zeitschriftenartikel (209)
- Vortrag (66)
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- Nanoparticles (24)
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Organisationseinheit der BAM
- 6 Materialchemie (134)
- 1 Analytische Chemie; Referenzmaterialien (85)
- 6.1 Oberflächen- und Dünnschichtanalyse (54)
- 1.2 Biophotonik (43)
- 8 Zerstörungsfreie Prüfung (36)
- 5 Werkstofftechnik (33)
- 4 Material und Umwelt (31)
- 6.3 Strukturanalytik (28)
- 6.6 Physik und chemische Analytik der Polymere (24)
- 7 Bauwerkssicherheit (22)
Paper des Monats
- ja (7)
Golusda, L. ; Kühl, A. A. ; Lehmann, M. ; Dahlke, K. ; Mueller, S. ; Boehm-Sturm, P. ; Saatz, Jessica ; Traub, Heike ; Schnorr, J. ; Freise, C. ; Taupitz, M. ; Biskup, K. ; Blanchard, V. ; Klein, O. ; Sack, I. ; Siegmund, B. ; Paclik, D.
Inflammatory bowel diseases (IBD) comprise mainly ulcerative colitis (UC) and Crohn´s disease (CD). Both forms present with a chronic inflammation of the (gastro) intestinal tract, which induces excessive changes in the composition of the associated extracellular matrix (ECM). In UC, the inflammation is limited to the colon, whereas it can occur throughout the entire gastrointestinal tract in CD. Tools for early diagnosis of IBD are still very limited and highly invasive and measures for standardized evaluation of structural changes are scarce. To investigate an efficient non-invasive way of diagnosing intestinal inflammation and early changes of the ECM, very small superparamagnetic iron oxide nanoparticles (VSOPs) in magnetic resonance imaging (MRI) were applied in two mouse models of experimental colitis: the dextran sulfate sodium (DSS)-induced colitis and the transfer model of colitis. For further validation of ECM changes and inflammation, tissue sections were analyzed by immunohistochemistry. For in depth ex-vivo investigation of VSOPs localization within the tissue, Europium-doped VSOPs served to visualize the contrast agent by imaging mass cytometry (IMC). VSOPs accumulation in the inflamed colon wall of DSS-induced colitis mice was visualized in T2* weighted MRI scans. Components of the ECM, especially the hyaluronic acid content, were found to influence VSOPs binding. Using IMC, colocalization of VSOPs with macrophages and endothelial cells in colon tissue was shown. In contrast to the DSS model, colonic inflammation could not be visualized with VSOP-enhanced MRI in transfer colitis. VSOPs present a potential contrast agent for contrast-enhanced MRI to detect intestinal inflammation in mice at an early stage and in a less invasive manner depending on hyaluronic acid content.
Grauel, Bettina ; Würth, Christian ; Homann, C. ; Krukewitt, Lisa ; Andresen, Elina ; Roik, Janina ; Recknagel, Sebastian ; Haase, M. ; Resch-Genger, Ute
Despite considerable advances in synthesizing high-quality core/shell upconversion (UC) nanocrystals (NC; UCNC) and UCNC photophysics, the application of near-infrared (NIR)-excitable lanthanide-doped UCNC in the life and material sciences is still hampered by the relatively low upconversion luminescence (UCL) of UCNC of small size or thin protecting shell. To obtain deeper insights into energy transfer and surface quenching processes involving Yb3+ and Er3+ ions, we examined energy loss processes in differently sized solid core NaYF4 nanocrystals doped with either Yb3+ (YbNC; 20% Yb3+) or Er3+ (ErNC; 2% Er3+) and co-doped with Yb3+ and Er3+ (YbErNC; 20% Yb3+ and 2% Er3+) without a surface protection shell and coated with a thin and a thick NaYF4 shell in comparison to single and co-doped bulk materials. Luminescence studies at 375 nm excitation demonstrate backenergy transfer (BET) from the 4G11/2 state of Er3+ to the 2F5/2 state of Yb3+, through which the red Er3+ 4F9/2 state is efficiently populated. Excitation power density (P)-dependent steady state and time-resolved photoluminescence measurements at different excitation and emission wavelengths enable to separate surface-related and volume-related effects for two-photonic and threephotonic processes involved in UCL and indicate a different influence of surface passivation on the green and red Er3+ emission.
The intensity and lifetime of the latter respond particularly to an increase in volume of the active UCNC core. We provide a threedimensional random walk model to describe these effects that can be used in the future to predict the UCL behavior of UCNC.
Silveira, A. ; Kardjilov, N. ; Markötter, Henning ; Longo, E. ; Greving, I. ; Lasch, P. ; Shahar, R ; Zaslansky, P.
Vertebrate bones are made of a nanocomposite consisting of water, mineral and organics. Water helps bone material withstand mechanical stress and participates in sensation of external loads. Water diffusion across vertebrae of medaka (bone material lacking osteocytes) and zebrafish (bone material containing osteocytes) was compared using neutron tomography. Samples were measured both wet and following immersion in deuterated-water (D2O). By quantifying H+ exchange and mutual alignment with X-ray lCT scans, the amount of water expelled from complete vertebra was determined. The findings revealed that anosteocytic bone material is almost twice as amenable to D2O diffusion and H2O exchange, and that unexpectedly, far more water is retained in osteocytic zebrafish bone. Diffusion in osteocytic bones (only 33 % – 39 % water expelled) is therefore restricted as compared to anosteocytic bone (~ 60 % of water expelled), presumably because water flow is confined to the lacunar-canalicular network (LCN) open-pore system. Histology and Raman spectroscopy showed that anosteocytic bone contains less proteoglycans than osteocytic bone. These findings identify a previously unknown functional difference between the two bone materials. Therefore, this study proposes that osteocytic bone retains water, aided by non-collagenous proteins, which contribute to its poroelastic mechano-transduction of water flow confined inside the LCN porosity.
Yao, J. ; Jiang, T. ; Ji, Y. ; An-Stepec, Biwen Annie ; Koerdt, Andrea ; Cai, Z. ; Dong, C. ; Ge, Y. ; Qi, Z.
Water is generally considered to be an undesirable substance in fuel system, which may lead to microbial contamination. The antibacterial strategies that can turn water into things of value with high disinfection efficacy have been urgently needed for fuel system. Here, we reveal a water-fueled autocatalytic bactericidal pathway comprised by bi-metal micro-electrode system, which can spontaneously produce reactive oxygen species (mainly H2O2 and O2•–) by the electron Fenton-like reaction in water medium without external energy., The respiratory chain component of bacteria and the galvanic corrosion on the coated metals were two electron sources in the system. The specific model of Ag-Ru water-fueled autocatalytic (WFA) microelectrode particles presents extremely high disinfection efficiency (>99.9999%) in less than one hour for three aerobic bacteria (Escherichia coli, Pseudomonas aeruginosa and Bacillus subtilis) in LB media and high disinfection efficiency for the anaerobic bacteria (Desulfovibrio alaskensis) in Postgate E media without natural light irradiation. Overall, the novel WFA Ag-Ru antibacterial material explored in this study has a high potential for sterilizing applications in fuel system and this work provides the potential for the development of non-chemical and water-based antibacterial materials, such as WFA Ag-Ru antibacterial coating on stainless steel.
Direct Laser Writing (DLW) and X-ray computed tomography (XCT) both offer unique possibilities in their respective fields. DLW produces full three-dimensional (3D) polymer structures on the microscale with resolutions below 100 nm. The fabricated structures can be analysed by XCT or X-ray microscopy (XRM), which incorporates additional X-ray lenses, in three dimensions down to a minimal basic spatial resolution of about 500 nm or 50 nm, respectively. In this work, two different DLW structures are analysed via XCT. Internal defects are detected and analysed for the purpose of quality control. Defects and structures with sizes down to 1.5 µm are successfully analysed. A 3D reconstruction and internal, hidden features of the fabricated structures are shown and discussed. In a first-of-its-kind study, we demonstrate the detectability of a single-voxel line inside a fabricated structure that would not be detectable with SEM or light microscopy. Furthermore, the direct fabrication on a PET substrate is shown to overcome the high X-ray absorbance of commonly used glass substrates. Attenuation spectra of SZ2080 and glass substrates are compared to a fabrication route direct on a 170 µm PET foil. The practical aspects of XCT measurements for DLW structures on different substrates will be discussed.
Würth, Christian ; Grauel, Bettina ; Pons, Monika ; Frenzel, Florian ; Rissiek, P. ; Rücker, Kerstin ; Haase, Markus ; Resch-Genger, Ute
High sensitizer and activator concentrations have been increasingly examined to improve the performance of multi-color emissive upconversion (UC) nanocrystals (UCNC) like NaYF4:Yb,Er and first strategies were reported to reduce concentration quenching in highly doped UCNC. UC luminescence (UCL) is, however, controlled not only by dopant concentration, yet by an interplay of different parameters including size, crystal and shell quality, and excitation power density (P). Thus, identifying optimum dopant concentrations requires systematic studies of UCNC designed to minimize additional quenching pathways and quantitative spectroscopy. Here, we quantify the dopant concentration dependence of the UCL quantum yield (ΦUC) of solid
NaYF4:Yb,Er/NaYF4:Lu upconversion core/shell nanocrystals of varying Yb3+ and Er3+ concentrations (Yb3+ series: 20%‒98% Yb3+; 2% Er3+; Er3+ series: 60% Yb3+; 2%‒40% Er3+). To circumvent other luminescence quenching processes, an elaborate synthesis yielding OH-free UCNC with record ΦUC of ~9% and ~25 nm core particles with a thick surface shell were used. High Yb3+ concentrations barely reduce ΦUC from ~9% (20% Yb3+) to ~7% (98% Yb3+) for an Er3+ concentration of 2%, thereby allowing to strongly increase the particle absorption cross section and UCNC brightness. Although an increased Er3+ concentration reduces ΦUC from ~7% (2% Er3+) to 1% (40%) for 60% Yb3+. Nevertheless, at very high P (> 1 MW/cm2) used for microscopic studies, highly Er3+-doped UCNC display a high brightness because of reduced saturation. These findings underline the importance of synthesis control and will pave the road to many fundamental studies of UC materials.
In der Masterarbeit wurde ein Screening gegen den CCMV mit einer linearen Peptidbibliothek entwickelt, wobei zwei lineare Binder identifiziert wurden. Das resynthetisierte Peptid wurde auf seine Bindungseigenschaften mittels ELISA und MST untersucht. Aufgrund eines Aminosäurefehlers in der selbst durchgeführten Resynthese des Peptids sind die Ergebnisse nicht vollständig übertragbar. Um eine umsetzbare Cyclusgröße für die Peptidbibliothek zu finden, wurden Ringgrößen mit sechs bis acht Aminosäuren untersucht. Da keiner der gewählten Ringgrößen bevorzugt war, wurde die Ringgröße aus acht Aminosäuren für die Peptidbibliothek gewählt. Der Ringschluss wurde durch die Bildung einer Disulfidbrücke erreicht. Dadurch war die Alkylierung der vorhandenen Thiolgruppe in den Abbruchsequenzen notwendig.
Neben den etablierten Alkylierungsreagenzien Iodessigsäure, Iodacetamid und Acrylamid wurden zwei Epoxide mituntersucht. Hierbei konnte nur bei Acrylamid und Propylenoxid eine vollständige Alkylierung beobachtet werden. Eine synthetische Peptidbibliothek aus zehn Aminosäuren pro Kopplungsschritt und einer Peptidlänge von acht Aminosäuren wurde erfolgreich nach der Split-and-Mix-Synthese hergestellt. Neben den kanonischen Aminosäuren wurde die synthetische Aminosäure 3-(3-Pyridyl)-alanin in die Peptidbibliothek mit eingebaut. Peptidsequenzen aus der cyclische Peptidbibliothek konnte mittels MALDI-TOF-MS identifiziert werden. Es konnte außerdem gezeigt werden, dass synthetische Aminosäuren mit proteinogenen Aminosäuren erfolgreich übersetzt werden. Anschließend wurde das entwickelte Screening auf eine cyclische Peptidbibliothek übertragen. Dabei konnte kein Binder identifiziert werden, da zu viele Nebenreaktionen auftraten. Ein alternativer Ringschluss über die Seitenketten von Lysin und Cystein wurden mit ortho-Phthaldialdehyd und 2,4,6-Trichloro-1,3,5-triazin (Cyanurchlorid) untersucht. Beide Bedingungen wiesen keinen erfolgreichen Ringschluss auf. Obwohl der Ringschluss über die Seitenketten von Lysin und Cystein nicht erfolgreich war, sollte ein Austausch von Cystein angestrebt werden, so dass kein freies Cystein in den Abbruchsequenzen vorhanden ist und die Alkylierung überflüssig wäre. Der Ringschluss durch Verwendung anderer Seitenketten bietet einen vielseitigen Ansatz.
Stroyuk, O. ; Raievska, O. ; Barabash, A. ; Batentschuk, M. ; Osvet, A. ; Fiedler, Saskia ; Resch-Genger, Ute ; Hauch, J. ; Brabec, C. J.
A new “green” and mild synthesis of highly stable microcrystalline Cs2AgxNa1-xBiyIn1-yCl6 (CANBIC) perovskites under ambient conditions was developed that is scalable to the multi-gram production. Under UV illumination, the CANBIC perovskites emit intense broadband photoluminescence (PL) with a quantum yield (QY) of 92% observed for x = 0.35 and y = 0.01-0.02. The combination of strong UV absorbance and broadband visible emission, high PL QY, and long PL lifetimes of up to 1.4 μs, along with an outstanding stability makes these CANBICs a promising material class for many optical applications.
Fa, X. ; Lin, Sh. ; Yang, J. ; Shen, Ch. ; Liu, Y. ; Gong, Y. ; Qin, A. ; Ou, Jun ; Resch-Genger, Ute
Anear-infrared (NIR) light-triggered release method for nitric oxide (NO) was developed utilizing core/shell NaYF4: Tm/Yb/Ca@NaGdF4:Nd/Yb up-conversion nanoparticles (UCNPs) bearing a mesoporous silica (mSiO2) shell loaded with theNOdonor S-nitroso-N-acetyl-DL-penicillamine (SNAP). To avoid overheating in biological samples, Nd3+ was chosen as a sensitizer, Yb3+ ions as the bridging sensitizer, andTm3+ ions as UV-emissive activator while co-doping with Ca2+ was done to enhance the luminescence of the activatorTm3+.NOrelease from SNAP was triggered by an NIR-UV up-conversion process, initiated by 808nmlight absorbed by the Nd3+ ions.NOrelease was confirmed by the Griess method. Under 808nmirradiation, the viability of the liver cancer cell line HepG2 significantly decreased with increasing UCNPs@mSiO2-SNAP concentration. For a UCNPs@mSiO2-SNAP concentration of 200 μgml−1, the cell survival probability was 47%. These results demonstrate that UCNPs@mSiO2-SNAP can induce the release of apoptosis-inducingNOby NIR irradiation.