scholarly journals Strong Effect of Hydrodynamic Coupling on the Electric Dichroism of Bent Rods

2005 ◽  
Vol 109 (2) ◽  
pp. 1034-1038 ◽  
Author(s):  
Dietmar Porschke ◽  
Jan M. Antosiewicz
Keyword(s):  
Hydrodynamic Coupling ◽  
Electric Dichroism

scholarly journals Studies on the Electric Dichroism of Dye-Gelatin Films. III

1951 ◽  
Vol 72 (11) ◽  
pp. 956-958 ◽  
Author(s):  
Ryojiro Iwaki ◽  
Daijiro Yamamoto
Keyword(s):  
Gelatin Films ◽  
Electric Dichroism

scholarly journals The Electric Dichroism of Printed-Out Silver

1951 ◽  
Vol 72 (8) ◽  
pp. 691-693
Author(s):  
Jitaro Shidei ◽  
Daijiro Yamamoto ◽  
Ryojiro Iwaki
Keyword(s):  
Electric Dichroism

scholarly journals Intracellular coupling modulates biflagellar synchrony

2021 ◽  
Vol 18 (174) ◽  
pp. 20200660
Author(s):  
Hanliang Guo ◽  
Yi Man ◽  
Kirsty Y. Wan ◽  
Eva Kanso
Keyword(s):  
Mathematical Models ◽  
Activity Level ◽  
Live Cells ◽  
Basal Bodies ◽  
Slip Mode ◽  
Biological Parameters ◽  
Hydrodynamic Coupling ◽  
Dimensionless Ratio ◽  
The Individual

Beating flagella exhibit a variety of synchronization modes. This synchrony has long been attributed to hydrodynamic coupling between the flagella. However, recent work with flagellated algae indicates that a mechanism internal to the cell, through the contractile fibres connecting the flagella basal bodies, must be at play to actively modulate flagellar synchrony. Exactly how basal coupling mediates flagellar coordination remains unclear. Here, we examine the role of basal coupling in the synchronization of the model biflagellate Chlamydomonas reinhardtii using a series of mathematical models of decreasing levels of complexity. We report that basal coupling is sufficient to achieve inphase, antiphase and bistable synchrony, even in the absence of hydrodynamic coupling and flagellar compliance. These modes can be reached by modulating the activity level of the individual flagella or the strength of the basal coupling. We observe a slip mode when allowing for differential flagellar activity, just as in experiments with live cells. We introduce a dimensionless ratio of flagellar activity to basal coupling that is predictive of the mode of synchrony. This ratio allows us to query biological parameters which are not yet directly measurable experimentally. Our work shows a concrete route for cells to actively control the synchronization of their flagella.

A stopped-flow electric dichroism study on adsorption of metal chelates by a colloidal clay

1990 ◽  
Vol 94 (15) ◽  
pp. 5896-5900 ◽  
Author(s):  
Masahiro. Taniguchi ◽  
Masami. Kaneyoshi ◽  
Yuji. Nakamura ◽  
Akihiko. Yamagishi ◽  
Toschitake. Iwamoto
Keyword(s):  
Metal Chelates ◽  
Stopped Flow ◽  
Electric Dichroism ◽  
Colloidal Clay

scholarly journals Transient electric dichroism of rod-like DNA molecules.

1978 ◽  
Vol 75 (1) ◽  
pp. 195-199 ◽  
Author(s):  
M. Hogan ◽  
N. Dattagupta ◽  
D. M. Crothers
Keyword(s):  
Dna Molecules ◽  
Electric Dichroism

Hydrodynamic Coupling of Viscous and Non-Viscous Numerical Wave Solutions Within the Open-Source Hydrodynamics Framework REEF3D

2021 ◽  
Author(s):  
Weizhi Wang ◽  
Csaba Pákozdi ◽  
Arun Kamath ◽  
Tobias Martin ◽  
Hans Bihs
Keyword(s):  
High Resolution ◽  
Boundary Conditions ◽  
Open Source ◽  
Laplace Equation ◽  
Scale Model ◽  
Surface Boundary ◽  
Cfd Model ◽  
Hydrodynamic Coupling ◽  
Coupling Strategy ◽  
Numerical Wave

Abstract A comprehensive understanding of the marine environment in the offshore area requires phase-resolved wave information. For the far-field wave propagation, computational efficiency is crucial, as large spatial and temporal scales are involved. For the near-field extreme wave events and wave impacts, high resolution is required to resolve the flow details and turbulence. The combined use of a computationally efficient large-scale model and a high-resolution local-scale solver provides a solution the combines accuracy and efficiency. This article introduces a coupling strategy between the efficient fully nonlinear potential flow (FNPF) solver REEF3D::FNPF and the high-fidelity computational fluid dynamics (CFD) model REEF3D::CFD within in the open-source hydrodynamics framework REEF3D. REEF3D::FNPF solves the Laplace equation together with the boundary conditions on a sigma-coordinate. The free surface boundary conditions are discretised using high-order finite difference methods. The Laplace equation for the velocity potential is solved with a conjugated gradient solver preconditioned with geometric multi-grid provided by the open-source library hypre. The model is fully parallelised following the domain decomposition strategy and the MPI protocol. The waves calculated with the FNPF solver are used as wave generation boundary condition for the CFD based numerical wave tank REEF3D::CFD. The CFD model employs an interface capturing two-phase flow approach that can resolve complex wave structure interaction, including breaking wave kinematics and turbulent effects. The presented hydrodynamic coupling strategy is tested for various wave conditions and the accuracy is fully assessed.

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