Article
Mechanics
Bhanu Pratap Rajak, Santimoy Kundu, Shishir Gupta
Summary: This paper investigates SH-wave propagation in a composite structure with a functionally graded piezomagnetic material (FGPM) layer overlying a microstructural coupled stress half-space using the Wentzel-Kramers-Brillouin (WKB) asymptotic approach. The study considers the mechanical and magnetic imperfectness of the interface between the two mediums and derives the dispersion equation for magnetically open and short conditions. The results show significant effects of elastic parameters, density, and various other parameters on the variation of phase velocity, particularly in the case of CoFe2O4. This work provides theoretical guidance for the analysis and design of surface acoustic wave (SAW) devices made of piezomagnetic materials and has implications in material engineering, seismology, geophysics, and other fields.
Article
Acoustics
Jyotsna Dhillon, Ezekiel Walker, Arkadii Krokhin, Arup Neogi
Summary: This study reports the use of nonreciprocity in the transmission band to trap energy inside a phononic crystal cavity, which is different from the widely used defect mode induced energy trapping mechanism. Passive nonreciprocity is achieved through the natural viscosity of the background liquid (water) and the asymmetry of aluminum scatterers. Experimental results show enhanced energy trapping at a frequency of 624 kHz when nonreciprocity suppresses acoustic radiation into the environment. Finite element numerical analysis further investigates and confirms the experimental findings.
Article
Materials Science, Multidisciplinary
Sudip Majumder, J. L. Drobitch, Supriyo Bandyopadhyay, Anjan Barman
Summary: We observed strong tripartite magnon-phonon-magnon coupling in a two-dimensional magnetoelastic crystal, where energy transfer and the formation of a new quasi-particle occurred when the frequencies and wavevectors of the three modes matched. This coupling phenomenon exhibited significant anisotropy.
NPG ASIA MATERIALS
(2023)
Article
Chemistry, Physical
King Chun Lai, Sebastian Matera, Christoph Scheurer, Karsten Reuter
Summary: The nature of an atom in a bonded structure depends on its local atomic environment. Identifying groups of atoms with equivalent environments is a frequent task in atomic-scale modeling and simulation, and we present a machine-learning framework to automate this task.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Mechanical
Hua-Yang Chen, Zhen-Hui Qin, Sheng-Nan Liang, Xin Li, Si-Yuan Yu, Yan-Feng Chen
Summary: A gradient-index seismic metamaterial based on a surface acoustic PnC is proposed to provide omnidirectional protection against ultra-broadband seismic Rayleigh waves.
EXTREME MECHANICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
V Romero-Garcia, E. Cheron, S. Kuznetsova, J-P Groby, S. Felix, V Pagneux, L. M. Garcia-Raffi
Summary: Stealthy hyperuniform materials exhibit robust wave transport properties in terms of scatterer dimensions and inherent viscothermal losses, but are strongly affected by scatterer resonances, which result in sharp dips in the transmission coefficient.
Article
Mechanics
Qingxiang Liu, Odin Gramstad, Alexander Babanin
Summary: The Hasselmann kinetic equation (HKE) and the generalized kinetic equation (GKE) play important roles in spectral wave models, but whether they behave significantly differently in handling angular spread wave fields remains controversial. This study found that updating the GKE algorithm does not lead to significant deviation from HKE-based results.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Roger J. Hosking, Fausto Milinazzo
Summary: This study extends the results of Miles & Sneyd on a simple linear mathematical model for an accelerating line load on a floating ice plate by conducting numerical calculations for the response due to a decelerating load. The results show various relationships between load speeds and deflections, with significances in certain scenarios where deflections may increase significantly.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Developmental Biology
Donald F. Ready, Henry C. Chang
Summary: The study reveals a previously unknown phenomenon of Ca2+ waves propagating across the interommatidial cell (IOC) network in Drosophila eyes, promoting stress fiber contraction and shaping the retinal floor morphology. Genetic evidence shows that these waves are independent of phototransduction but require the inositol 1,4,5-triphosphate receptor (IP3R). Additionally, IOC waves interact with the extracellular matrix, affecting eye morphogenesis.
Article
Engineering, Aerospace
Chao Jiang, Jianfeng Pan, Junjie Weng, Jianxing Li, Evans K. Quaye
Summary: This study numerically investigates the re-initiation process of H-2/O-2 detonation propagating from a vertical channel to a horizontal channel under different concentration gradients. The results show that the detonation can be re-initiated successfully for both positive and negative concentration gradients, but the formation modes of the transverse waves differ. The transverse waves are mainly formed on the fuel-lean side, and the earlier transverse waves originate from the transverse waves of the transverse detonation.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Ryan P. P. Creedon, Bernard Deconinck
Summary: We developed a perturbation method to describe the unstable spectral elements associated with the Benjamin-Feir instability of Stokes waves. These unstable elements form a figure-eight curve in the complex spectral plane, parametrized by a Floquet exponent. Our asymptotic expansions are in agreement with numerical computations and recent rigorous results. By analyzing the expansions, we obtained high-order estimates for the growth rates of the Benjamin-Feir instability and the parametrization of the figure-eight curve.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Physics, Applied
Daxing Dong, Weimian Li, Xiao Li, Jiaqing Liu, Youwen Liu, Hongli Ji, Yadong Xu, Yangyang Fu
Summary: In this study, we demonstrate the trapping, guiding, and manipulation of sound waves in spoof-fluid-spoof acoustic waveguides with gradient index modulation. Through the interaction between propagation waves and spoof surface waves, various functional sound propagation phenomena are observed, including broadband transmission, reflection, resonances, and bound states in the continuum. These effects can be modulated by manipulating the fluid gap and doped defects in the waveguide structure. This research opens up possibilities for manipulating sound waves in different acoustic applications, such as sensing, filtering, insulation, and wavefront engineering.
APPLIED PHYSICS LETTERS
(2023)
Article
Mechanics
M. S. Krakov, C. A. Khokhryakova, E. Kolesnichenko
Summary: The influence of a magnetic field on the pattern of stationary waves formed on the surface of a magnetic fluid has been studied both theoretically and experimentally. It is found that a vertical magnetic field affects the shape and amplitude of the wave cone, while a horizontal magnetic field affects the extent of cone expansion and amplitude.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Multidisciplinary Sciences
Guillaume Fle, Elijah Van Houten, Gaudeline Remillard-Labrosse, Greg FitzHarris, Guy Cloutier
Summary: In recent years, researchers have explored cellular biomechanical properties as a new method of oocyte selection in reproductive science. The reconstruction of viscoelastic parameter images in such materials remains a challenge. This study proposes a framework for mapping viscoelasticity at the subcellular scale and successfully applies it to live mouse oocytes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Mechanics
Wooyoung Choi, Malik Chabane, Tore Magnus A. Taklo
Summary: This study examines resonant triad interactions between surface and internal gravity waves in a two-layer system with a free surface, exploring amplitude equations under different resonance conditions and comparing numerical solutions with the amplitude equations.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Cell Biology
Tappei Mishina, Namine Tabata, Tetsutaro Hayashi, Mika Yoshimura, Mana Umeda, Masashi Mori, Yayoi Ikawa, Hiroshi Hamada, Itoshi Nikaido, Tomoya S. Kitajima
Summary: Chromosome segregation errors in oocytes due to aging can lead to the production of aneuploid eggs, with calorie restriction showing potential to prevent this age-related issue. Transcriptome changes are observed in oocytes at different reproductive stages, with up-regulation of genes involved in chromosome segregation under calorie restriction.
Article
Biochemistry & Molecular Biology
Cecilia P. Sanchez, Pintu Patra, Shih-Ying Scott Chang, Christos Karathanasis, Lukas Hanebutte, Nicole Kilian, Marek Cyrklaff, Mike Heilemann, Ulrich S. Schwarz, Mikhail Kudryashev, Michael Lanzer
Summary: KAHRP plays a key role in Plasmodium falciparum malaria by forming membrane protrusions in infected erythrocytes, anchoring parasite-encoded adhesins to the membrane skeleton. Through super-resolution microscopy, it was found that KAHRP initially associates with various skeletal components before eventually colocalizing with remnant actin junctions under the spiral scaffold forming knobs. Additionally, a dynamic model of KAHRP organization and its function in attaching other factors to the spiral scaffold was proposed based on the findings.
MOLECULAR MICROBIOLOGY
(2022)
Article
Biophysics
Steven Huth, Johannes W. Blumberg, Dimitri Probst, Jan Lammerding, Ulrich S. Schwarz, Christine Selhuber-Unkel
Summary: Researchers have developed a novel approach to quantify intracellular force transmission by combining microneedle shearing and traction force microscopy. The experiment shows that cells dynamically redistribute forces under external shearing and experience changes in force loading during sequential rupture of their adhesion sites. This strategy offers new perspectives for future studies of force transmission and mechanotransduction in cells.
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Johannes W. Blumberg, Ulrich S. Schwarz
Summary: The text discusses a systematic comparison between two fundamentally different approaches to 2.5D traction force microscopy (TFM). The direct method involves calculating strain and stress tensors directly from displacement data, while the inverse method minimizes the difference between estimated and measured displacements. Experimental results show that the direct method approaches the performance of 2.5D FTTC for larger noise and does not necessarily require a divergence correction. Additionally, increasing resolution benefits the direct method more than the inverse method.
Article
Physics, Multidisciplinary
Pintu Patra, Konrad Beyer, Astha Jaiswal, Anna Battista, Karl Rohr, Friedrich Frischknecht, Ulrich S. Schwarz
Summary: The collective motion of malaria parasites, specifically the Plasmodium sporozoites, is analyzed. It is found that the mechanical flexibility of the sporozoites is favorable for transmission, as it allows for sorting of the parasites based on their curvatures and speeds. Additionally, the vortices formed by the sporozoites exhibit oscillatory breathing due to the storage of motility force in their elastic energy.
Article
Biochemical Research Methods
Julia Jaeger, Pintu Patra, Cecilia P. Sanchez, Michael Lanzer, Ulrich S. Schwarz
Summary: Malaria is a deadly infectious disease caused by a parasite that multiplies within red blood cells. Researchers have developed a computational model to predict the changes in mechanical properties and protein distribution in infected red blood cells. Their simulations show that specific proteins can relocate on the red blood cell surface due to changes in binding affinities, in agreement with experimental observations. This model can provide further insights into the mechanism of malaria parasite attack on red blood cell cytoskeleton.
PLOS COMPUTATIONAL BIOLOGY
(2022)
Article
Physics, Multidisciplinary
Rick Bebon, Ulrich S. Schwarz
Summary: The article explores the computation of complex energy landscapes in biological systems, particularly their effects on first-passage times (FPTs). The authors propose a method to identify the most relevant features of energy landscapes by coarse-graining the Fokker-Planck equation to a master equation and decomposing its FPTs iteratively. They apply this method to the electrostatic interaction between two nonmuscle myosin II (NM2) rods and identify the most relevant energy barriers for their self-assembly into NM2 minifilaments and how they change under force.
NEW JOURNAL OF PHYSICS
(2022)
Article
Biophysics
T. Andersen, D. Woerthmueller, D. Probst, I. Wang, P. Moreau, V. Fitzpatrick, T. Boudou, U. S. Schwarz, M. Balland
Summary: Adherent cells generate mechanical force and sense the physical properties of their environment using actomyosin contractility, which has important implications for cell migration, division, differentiation, and fate. The organization of the actomyosin system within cells is highly variable and controlled by small GTPases from the Rho family. Activation of Rho regulators leads to cell-scale force generation, and the dynamics of this response are influenced by cell size and the architecture of the actin cytoskeleton, which are in turn regulated by the extracellular environment.
BIOPHYSICAL JOURNAL
(2023)
Article
Cell Biology
Markus Mund, Aline Tschanz, Yu-Le Wu, Felix Frey, Johanna L. Mehl, Marko Kaksonen, Ori Avinoam, Ulrich S. Schwarz, Jonas Ries
Summary: The study reveals the three-dimensional shapes of clathrin coats during endocytosis and introduces a novel Cooperative Curvature Model that accurately describes the changes in shapes and dynamics. The findings provide insights into the mechanism of clathrin coat remodeling during endocytosis and offer a potential general model for clathrin coat remodeling on the plasma membrane.
JOURNAL OF CELL BIOLOGY
(2023)
Article
Biophysics
Gonen Golani, Ulrich S. Schwarz
Summary: The fusion of lipid membranes involves significant energy barriers related to stalk and fusion pore formation. By using continuum elastic theory, the relationship between membrane shape and energy barriers was determined. The stalk formation energy decreases with curvature, while the fusion pore formation energy barrier shows a more complicated behavior. These findings can be utilized to prevent viral infections and inhibit polymorphic virus infection.
BIOPHYSICAL JOURNAL
(2023)
Review
Cell Biology
Isabel Kemmer, Antje Keppler, Beatriz Serrano-Solano, Arina Rybina, Bugra Oezdemir, Johanna Bischof, Ayoub El Ghadraoui, John E. Eriksson, Aastha Mathur
Summary: Bioimaging is facing challenges in handling, analyzing, and managing the increasingly complex datasets due to the rapid development of microscopy technologies. Efforts and solutions are being developed by the microscopy community to address these challenges, and collaborations within the microscopy ecosystem, as well as research infrastructures like Euro-BioImaging, are shaping the field.
HISTOCHEMISTRY AND CELL BIOLOGY
(2023)
Article
Chemistry, Physical
Santiago Gomez Melo, Dennis Woerthmueller, Pierre Gonczy, Niccolo Banterle, Ulrich S. Schwarz
Summary: SAS-6 self-assembles into rings on a surface, ensuring the nine-fold symmetry of centriole organelle. Simulation and experimental comparison show that weak interaction energies and small angular range are necessary for the selection of nine-fold symmetry.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Petr Shendrik, Gonen Golani, Raviv Dharan, Ulrich S. Schwarz, Raya Sorkin
Summary: Fusion of biological membranes plays a fundamental role in various physiological events. The energy barriers of fusion stages are tightly dependent on the mechanical and physical properties of the system, including membrane tension. This study reveals that membrane tension inhibits lipid mixing and increases the energy barrier of hemifusion stalk formation, leading to a delay in lipid mixing time.
Review
Biochemical Research Methods
Christopher Schmied, Michael S. Nelson, Sergiy Avilov, Gert-Jan Bakker, Cristina Bertocchi, Johanna Bischof, Ulrike Boehm, Jan Brocher, Mariana T. Carvalho, Catalin Chiritescu, Jana Christopher, Beth A. Cimini, Eduardo Conde-Sousa, Michael Ebner, Rupert Ecker, Kevin Eliceiri, Julia Fernandez-Rodriguez, Nathalie Gaudreault, Laurent Gelman, David Grunwald, Tingting Gu, Nadia Halidi, Mathias Hammer, Matthew Hartley, Marie Held, Florian Jug, Varun Kapoor, Ayse Aslihan Koksoy, Judith Lacoste, Sylvia Le Devedec, Sylvie Le Guyader, Penghuan Liu, Gabriel G. Martins, Aastha Mathur, Kota Miura, Paula Montero Llopis, Roland Nitschke, Alison North, Adam C. Parslow, Alex Payne-Dwyer, Laure Plantard, Rizwan Ali, Britta Schroth-Diez, Lucas Schuetz, Ryan T. Scott, Arne Seitz, Olaf Selchow, Ved P. Sharma, Martin Spitaler, Sathya Srinivasan, Caterina Strambio-De-Castillia, Douglas Taatjes, Christian Tischer, Helena Klara Jambor
Summary: This article presents community-developed checklists for preparing light microscopy images and describing image analyses in order to enhance the clarity and reproducibility of image figures and improve the quality and explanatory power of microscopy data.
Article
Physics, Multidisciplinary
Oliver M. Drozdowski, Falko Ziebert, Ulrich S. Schwarz
Summary: Cell crawling on flat substrates is driven by the interplay between actin polymerization at the front and myosin contractility at the back. Optogenetics provides a way to experimentally control contraction and cell migration. Theoretical analysis using a one-dimensional active gel model predicts the possibility of switching between sessile and motile states through optogenetic activation or inhibition of contractility.
COMMUNICATIONS PHYSICS
(2023)
