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Haruhiko Yao
Nagoya University
Phase transitionChemistryX-ray crystallographyHeat capacityCrystallography
10Publications
4H-index
233Citations
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Publications 7
Newest
#2Ichiro HattaH-Index: 26
Last. Haruhiko YaoH-Index: 4
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#1Ichiro HattaH-Index: 26
#2Haruhiko YaoH-Index: 4
Last. Kenji EmaH-Index: 17
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#1S. MatuokaH-Index: 1
#2Haruhiko YaoH-Index: 4
Last. I. HattaH-Index: 1
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In the ripple phase of fully hydrated multilamellar vesicles of dipalmitoylphosphatidylcholine (DPPC), two kinds of small-angle x-ray diffraction profiles are observed on cooling through the main transition. One is a seemingly normal profile similar to that observed on heating and the other is the superposition of the diffraction profiles for the primary (normal) and the secondary ripple structures. We found that the profile obtained depended on the cooling rate. Increasing the cooling rate from...
22 CitationsSource
#1Haruhiko Yao (Nagoya University)H-Index: 4
#2Sinzi Matuoka (Nagoya University)H-Index: 6
Last. Ichiro Hatta (Nagoya University)H-Index: 16
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Fully hydrated dipalmitoylphosphatidylcholine (DPPC) undergoes liquid crystalline to metastable Pβ, phase transition in cooling. A small angle x-ray scattering study has been performed for obtaining further evidence about the structure of this phase. From a high-resolution observation of x-ray diffraction profiles, a distinct multipeak pattern has become obvious. Among them the (01) reflection in the secondary ripple structure is identified clearly. There are peaks assigned straightforwardly to ...
47 CitationsSource
#1Haruhiko Yao (Nagoya University)H-Index: 4
#2Ichiro Hatta (Nagoya University)H-Index: 16
Last. Boris Tenchov (BAS: Bulgarian Academy of Sciences)H-Index: 23
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The phase transitions of dipalmitoylphosphatidylethanolamine (DPPE) in excess water have been examined by low-angle time-resolved x-ray diffraction and calorimetry at low scan rates. The lamellar subgel/lamellar liquid-crystalline (L c → L α ), lamellar gel/lamellar liquid-crystalline (L β → L α ), and lamellar liquid-crystalline/lamellar gel (L α → L β ) phase transitions proceed via coexistence of the initial and final phases with no detectable intermediates at scan rates 0.1 and 0.5°C/min. At...
50 CitationsSource
#1Boris G. Tenchov (Nagoya University)H-Index: 1
#2Haruhiko Yao (Nagoya University)H-Index: 4
Last. Ichiro Hatta (Nagoya University)H-Index: 26
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The phase transitions in fully hydrated dipalmitoylphosphatidylcholine (DPPC) and DPPC/water/ethanol phases have been studied by lowangle time-resolved x-ray diffraction under conditions similar to those employed in calorimetry (scan rates 0.05–0.5°C/min and uniform temperature throughout the samples). This approach provides more adequate characterization of the equilibrium transition pathways and allows for close correlations between structural and thermodynamic data. No coexistence of the ripp...
103 CitationsSource
#1Ichiro HattaH-Index: 26
Last. Haruhiko YaoH-Index: 4
view all 4 authors...
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