1,868 results match your criteria: "Universitat Konstanz.[Affiliation]"

The 2025 Motile Active Matter Roadmap.

J Phys Condens Matter

January 2025

Biozentrum, University of Basel, Spitalstrasse 41, Basel, Basel-Stadt, 4056, SWITZERLAND.

Activity and autonomous motion are fundamental aspects of many living and engineering systems. Here, the scale of biological agents covers a wide range, from nanomotors, cytoskeleton, and cells, to insects, fish, birds, and people. Inspired by biological active systems, various types of autonomous synthetic nano- and micromachines have been designed, which provide the basis for multifunctional, highly responsive, intelligent active materials.

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Former studies have established that individuals with a cochlear implant (CI) for treating single-sided deafness experience improved speech processing after implantation. However, it is not clear how each ear contributes separately to improve speech perception over time at the behavioural and neural level. In this longitudinal EEG study with four different time points, we measured neural activity in response to various temporally and spectrally degraded spoken words presented monaurally to the CI and non-CI ears (5 left and 5 right ears) in 10 single-sided CI users and 10 age- and sex-matched individuals with normal hearing.

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We present the synthesis, characterization, and photophysical properties of two pyrene-modified () pincer bismuth complexes, where the pyrenyl residues are either part of the cyclometalating pincer ligand (1) or bound as monodentate ligands to the Bi ion (2). Both complexes are dually emissive at 77 K. For complex 2, pyrenyl phosphorescence persists at r.

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Aim: Different access routes to inpatient-equivalent home treatment (IEHT) were examined.

Methods: Baseline differences were examined using exploratory group comparisons, treatment effects by type of admission using regression analysis.

Results: Of 200 StäB users, 144 (72%) were admitted directly to IEHT, while 56 (28%) were transferred.

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This work presents a theoretical analysis of the motion of a tracer colloid driven by a time-dependent force through a viscoelastic fluid. The recoil of the colloid after application of a strong force is determined. It provides insights into the elastic forces stored locally in the fluid and their weakening by plastic processes.

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The application of psychedelics in psychiatry and psychotherapy is increasingly the subject of scientific evaluation and discussion in national and international professional and general society, and, internationally, has already been partly applied in the clinical setting. The manuscript provides a basic description of the state of the art regarding evidence and clinical issues; law, ethics and economics are addressed; therapeutic qualification of potential users and a potentially clinical embedding in psychiatry are discussed, taking into consideration current challenges. Thus, the discussion will cover the circumstances under which the application of psychedelics might have a potential to broaden the spectrum of treatments in certain psychiatric conditions, particularly in the context of chronicity and treatment resistance to current methods.

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Fluorine Labeling and F NMR Spectroscopy to Study Biological Molecules and Molecular Complexes.

Chemistry

January 2025

Department of Chemistry and Graduate School of Chemical-Biology (KoRS-CB), Universität Konstanz, Universitätsstraße 10, 78464, Konstanz, Germany.

High-resolution nuclear magnetic resonance (NMR) spectroscopy represents a key methodology for studying biomolecules and their interplay with other molecules. Recent developments in labeling strategies have made it possible to incorporate fluorine into proteins and peptides reliably, with manageable efforts and, importantly, in a highly site-specific manner. Paired with its excellent NMR spectroscopic properties and absence in most biological systems, fluorine has enabled scientists to investigate a rather wide range of scientific objectives, including protein folding, protein dynamics and drug discovery.

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Motility coupled to responsive behavior is essential for many microorganisms to seek and establish appropriate habitats. One of the simplest possible responses, reversing the direction of motion, is believed to enable filamentous cyanobacteria to form stable aggregates or accumulate in suitable light conditions. Here, we demonstrate that filamentous morphology in combination with responding to light gradients by reversals has consequences far beyond simple accumulation: Entangled aggregates form at the boundaries of illuminated regions, harnessing the boundary to establish local order.

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The smooth emergence of shear elasticity is a hallmark of the liquid to glass transition. In a liquid, viscous stresses arise from local structural rearrangements. In the solid, Eshelby has shown that stresses around an inclusion decay as a power law r-D, where D is the dimension of the system.

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Formation and Controlling of Optical Hopfions in High Harmonic Generation.

Phys Rev Lett

September 2024

State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics, School of Physics, Peking University, Beijing 100871, China.

Article Synopsis
  • Toroidal vortices are advanced light structures that could have applications in fields like quantum information and photonic topology.
  • The study explores how these vortices interact with atoms to produce unique harmonic spectra, showcasing a new type of high-order topological vortices due to their rotating fields.
  • By combining toroidal and optical vortices, researchers can create optical hopfions in the extreme ultraviolet range, leading to new ways to control their topological properties and direct specific harmonics through a single mode.
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Aim: Inpatient-Equivalent Home Treatment (IEHT) for mental health is new in Germany and therefore requires quality development. A best practice model (BPM) for IEHT is being developed from a service user perspective.

Methods: 1.

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Urea is a non-toxic, harmless, and abundant bulk organic chemical featuring high nitrogen content. Therefore, urea could be a prime green candidate for introducing nitrogen atoms into organic molecules. In this regard, urea in organic synthesis has been mainly employed as building block, component of solvent systems, catalyst, or for pH adjustment, while uses of urea as NH-source towards the construction of small organic compounds are scarce.

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Article Synopsis
  • Proximity effects in thin ferromagnetic films enable unique adjustments in magnetic properties when they are in contact, influencing their magnetic interactions at the interface.
  • By studying combinations of low-rare-earth ferromagnets and 3d transition metals, researchers can achieve room-temperature magnetism, especially in materials like europium monoxide (EuO) without altering their core properties.
  • Hard X-ray photoelectron spectroscopy techniques reveal that the thickness of the EuO layer significantly impacts its magnetic coupling, demonstrating that this effect is a short-range phenomenon that enhances magnetic order, particularly in lower dimensions, making it valuable for spin-based technologies.
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We report a facile green hydrothermal synthesis (HTS) of monoliths of hydrogels decorated with noble metal nanoparticles (NPs). The one-pot approach requires solely water, a polysaccharide able to form a hydrogel, and a salt precursor (M-containing) for the metal NPs. The polysaccharide fulfills three roles: (i) it acts as the reducing agent of M to M under hydrothermal conditions, (ii) it stabilizes NPs surfaces, and (iii) it forms a hydrogel scaffold in which the metal NPs are embedded.

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Integrins are fundamental for cell adhesion and the formation of focal adhesions (FA). Accordingly, these receptors guide embryonic development, tissue maintenance, and haemostasis but are also involved in cancer invasion and metastasis. A detailed understanding of the molecular interactions that drive integrin activation, FA assembly, and downstream signalling cascades is critical.

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The aim of this study is to measure young adolescent boys' and girls' attitudes toward uncommitted sexual behaviors and gain insight into their perception of peers' sexual exploration interest in committed versus non-committed opposite-gender relations. We constructed a new 5-item measurement of young adolescents' attitudes toward uncommitted sexual behavior (sociosexuality) and report on the reliability and construct validity of the scale. Analyses were performed on a sample of 425 secondary school students (187 boys, 238 girls, Mean age = 14.

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We report on three new 9-phenyl-substituted ferroceno[2,3]indenylmethylium dyes - with electron-donating (OMe, Me) or electron-withdrawing (CF) substituents. Complexes - exist as racemic mixtures of and enantiomers. Pyramidalization at the methyl C atom in the precursor carbinol species - or the corresponding one-electron reduced radicals induces a second stereocenter, as the 9-phenyl substituent may reside in an or an position.

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Article Synopsis
  • The study examines how active Brownian particles behave when trapped in a soft, annulus-shaped channel, uncovering unique properties due to confinement.
  • A new "reentrant behavior" is noted, which doesn't occur in systems without confinement, suggesting a complex relationship between confinement strength and particle dynamics.
  • The results are supported by simulations and analyses, demonstrating that interactions between the Péclet number and the confining dimensions can prevent clogging at soft boundaries.
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We report the synthesis, characterization, and photophysical properties of four new dye-modified ()Bi pincer complexes with two mercaptocoumarin or mercaptopyrene ligands. Their photophysical properties were probed by UV/vis spectroscopy, photoluminescence (PL) studies, and time-dependent density functional theory (TD-DFT) calculations. Absorption spectra of the complexes are dominated by mixed pyrene or coumarin π → π*/n(pS) → pyrene or coumarin π* transitions.

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Colloidal dispersions composed of polymethylmetacrylate particles dispersed in a mixture of cyclohexyl bromide and decalin find widespread use as model systems in optical microscopy experiments. While the system allows simultaneous density and refractive index matching, preparing particles with hard potentials remains challenging, and strong variations in the physical parameters of samples prepared in the same manner are commonly observed. Here, we present data on the measurement of forces between individual pairs of particles in highly diluted dispersions over the course of tens of days using the blinking optical tweezers method.

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Article Synopsis
  • Soft amorphous materials, like clays and gels, are common viscoelastic solids that can transform from solid to liquid under deformation, altering their microstructure.
  • A workshop at the Lorentz Center in Leiden from January 9 to 13, 2023, focused on this yielding transition in these materials.
  • The resulting manuscript highlights key insights and open questions from discussions at the workshop, pointing to future experimental and theoretical challenges in the field.
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Chirality is a phenomenon with widespread relevance in fundamental physics, material science, chemistry, optics, and spectroscopy. In this work, we show that a free electron can be converted by the field cycles of laser light into a right-handed or left-handed coil of mass and charge. In contrast to phase-vortex beams, our electrons maintained a flat de Broglie wave but obtained their chirality from the shape of their expectation value in space and time.

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