Naohito Urakami

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We have investigated the lipid sorting in a binary small unilamellar vesicle (SUV) composed of cone-shaped (1,2-dihexanoyl-sn-glycero-3-phosphocholine: DHPC) and cylinder-shaped (1,2-dipalmitoyl-sn-glycero-3-phosphocholine: DPPC) lipids. In order to reveal the lipid sorting we adopted a contrast matching technique of small angle neutron scattering (SANS),(More)
We investigate a temperature-driven recursive division of binary giant unilamellar vesicles (GUVs). During the heating step of the heating-cooling cycle, the spherical mother vesicle deforms to a budded limiting shape using up the excess area produced by the chain melting of the lipids and then splits off into two daughter vesicles. Upon cooling, the(More)
Crystallization in n-alkane ultrathin films supported by solid substrates is investigated by molecular dynamics simulation. We consider a relatively short n-alkane, undecane C11H24, on a flat substrate of varied degree of attraction. By the use of the united atom model for n-alkane, we reveal several characteristics of the thin film crystallization. It is(More)
Relatively short peptides, such as toxins and antimicrobial-peptides, are known to insert themselves into cell membranes. On the basis of simple bead-spring models for the membrane lipids, the peptide, and water, detailed processes of the peptide insertion is investigated by molecular dynamics simulation; our special concern is in the highly cooperative(More)
Using a contrast matching technique of small angle neutron scattering (SANS), we have investigated a phase separation to liquid-disordered and liquid-ordered phases on ternary small unilamellar vesicles (SUVs) composed of deuterated-saturated, hydrogenated-unsaturated phosphatidylcholine lipids and cholesterol, where the equilibrium size of these domains is(More)
We have investigated the entropic interactions between lamellar membranes and spherical colloidal particles using a small-angle neutron scattering (SANS) technique. By adding colloidal particles between lamellar sheets, the first lamellar peaks in SANS profiles become intense and the second and higher order Bragg peaks begin to appear, indicating that the(More)
We have performed Brownian dynamics simulations in order to investigate the formation of a pseudopolyrotaxane (PPRX) with cyclodextrins (CDs) and a polymer chain and the development of orientational order between PPRXs. The coarse-grained model is used to model the CDs and the polymer chain. In our simulations, we observe the formation of a rodlike PPRX(More)
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