342 citations · 1.2k across the 38 of their papers we have counts for
14 papers · 1 filter
Self-organized Archimedean Spiral Pattern: Regular Bundling of Fullerene through Solvent Evaporation
Yong-Jun Chen, Kosuke Suzuki, Hitoshi Mahara +2
We report the spontaneous generation of an Archimedean spiral pattern of fullerene via the evaporation of solvent. The self-organized spiral pattern exhibited equi-spacing on the o…
How does torsional rigidity affect the wrapping transition of a semiflexible chain around a spherical core?
Yuji Higuchi, Takahiro Sakaue, Kenichi Yoshikawa
We investigated the effect of torsional rigidity of a semiflexible chain on the wrapping transition around a spherical core, as a model of nucleosome, the fundamental unit of chrom…
Finite-Width Bundle is Most Stable in a Solution with Salt
Takuya Saito, Kenichi Yoshikawa
We applied the mean-field approach to a columnar bundle assembled by the parallel arrangement of stiff polyelectrolyte rods in a salt bath. The electrostatic potential can be divid…
Chain Length Dependence on Folding Transition of a Semiflexible Homo-polymer Chain: Appearance of a Core-Shell Structure
Yuji Higuchi, Takahiro Sakaue, Kenichi Yoshikawa
The folding transition of single, long semiflexible polymers was studied with special emphasis on the chain length effect using Monte Carlo simulations. While a relatively short ch…
Generation of Multiple Circular Walls on a Thin Film of Nematic Liquid Crystal by Laser Scanning
M. Kojima, J. Yamamoto, K. Sadakane +1
We found that multiple circular walls (MCW) can be generated on a thin film of a nematic liquid crystal through a spiral scanning of a focused IR laser. The ratios between radii of…
Core-shell structures in single flexible-semiflexible block copolymers: Finding the free energy minimum for the folding transition
Natsuhiko Yoshinaga, Kenichi Yoshikawa
We investigate the folding transition of a single diblock copolymer consisting of a semiflexible and a flexible block. We obtain a {\it Saturn-shaped} core-shell conformation in th…
Elucidation of Conformational Hysteresis on a Giant DNA
Chwen-Yang Shew, Yuji Higuchi, Kenichi Yoshikawa
The conformational behavior of a giant DNA mediated by condensing agents in the bulk solution has been investigated through experimental and theoretical approaches. Experimentally,…
Domain Growth Kinetics in a Cell-sized Liposome
Daisuke Saeki, Tsutomu Hamada, Kenichi Yoshikawa
We investigated the kinetics of domain growth on liposomes consisting of a ternary mixture (unsaturated phospholipid, saturated phospholipid, and cholesterol) by temperature jump.…
Elongation/Compaction of Giant DNA Caused by Depletion Interaction with a Flexible Polymer
M. Kojima, K. Kuobo, K. Yoshikawa
Structural changes in giant DNA induced by the addition of the flexible polymer PEG were examined by the method of single-DNA observation. In dilute DNA conditions, individual DNA…
Reversible photo-switching in a cell-sized vesicle
Tsutomu Hamada, Yuko T. Sato, Takeshi Nagasaki +1
A photosensitive amphiphilic molecule can switch the shape of an assembled vesicle as determined by microscopic observation. Photo-isomerization induces a change in membrane fluctu…
Why is the condensed phase of DNA preferred at higher temperature? DNA compaction in the presence of a multivalent cation
Takuya Saito, Takafumi Iwaki, Kenichi Yoshikawa
Upon the addition of multivalent cations, a giant DNA chain exhibits a large discrete transition from an elongated coil into a folded compact state. We performed single-chain obser…
Different pathways in mechanical unfolding/folding cycle of a single semiflexible polymer
Natsuhiko Yoshinaga, Kenichi Yoshikawa, Takao Ohta
Kinetics of conformational change of a semiflexible polymer under mechanical external field were investigated with Langevin dynamics simulations. It is found that a semiflexible po…
Entrapping a polymer chain in a light well under a good solvent condition
Masatoshi Ichikawa, Kenichi Yoshikawa, Yukiko Matsuzawa
During the last decade, the laser trapping technique has been actively applied to elucidate the property of macromolecules, DNA, RNA, cytoskeleton fibres, etc. Due to the inherent…
Structural changes in block copolymer solution under shear flow as determined by nonequilibrium molecular dynamics
Igor Rychkov, Kenichi Yoshikawa
A nonequilibrium molecular dynamics computer simulation on microsegregated solutions of symmetrical diblock copolymers is reported. As the polymer concentration increases, the syst…