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Sinzi Matuoka
Nagoya University
9Publications
6H-index
132Citations
Publications 9
Newest
#1Haruhiko YaoH-Index: 13
Last.Kenji EmaH-Index: 17
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#1Ichiro Hatta (Nagoya University)H-Index: 26
#2Sinzi Matuoka (Nagoya University)H-Index: 6
Last.Leonard Finegold (Drexel University)H-Index: 13
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Abstract Model membranes of diacylphosphatidylcholines (CnPC), with saturated linear acyl chains of n > 12 carbons, show a single sharp phase transition (known as the main transition) between the gel phase Pβ, and the liquid crystalline phase Lα with differential scanning calorimetry. However, C12PC (dilauroylphosphatidylcholine) shows, as well as the sharp transition at −2°C, a broad peak at 5°C, originally observed by S. Mabrey and J.M. Sturtevant. The broad peak is not artificial: between the...
18 CitationsSource
#1Hideyuki Takahashi (Nagoya University)H-Index: 68
#2Sinzi MatuokaH-Index: 6
Last.Ichiro Hatta (Nagoya University)H-Index: 16
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The effects of poly(l-lysine) on the structural and thermotropic properties of dipalmitoylphosphatidylglycerol (DPPG) bilayers were studied with differential scanning calorimetry (DSC), X-ray diffraction and freeze-fracture electron microscopy. For thermal behavior, in the DPPG/poly(l-lysine) system the main transition temperature rises to 45.7°C and the pretransition disappears in opposition to pure DPPG vesicles. An additional transition appears approximately at 36°C for the DPPG/poly(l-lysine...
16 CitationsSource
#1Hideyuki Takahashi (Nagoya University)H-Index: 68
#2Sinzi Matuoka (Nagoya University)H-Index: 6
Last.Ichiro Hatta (Nagoya University)H-Index: 16
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Abstract Structure of dipalmitoylphosphatidic acid (DPPA) bilayers in the presence of poly( l -lysine) is proposed from the results of X-ray diffraction obtained by a storage phosphir detector with a high resolution called an imaging plate. The small-angle X-ray diffraction pattern exhibits that DPPA/poly( l -lysine) complex forms a highly ordered multilamellar structure. The electron density profile of the DPPA/poly( l -lysine) complex draws that only one poly( l -lysine) layer is intercalated ...
24 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
#1Sinzi Matuoka (Nagoya University)H-Index: 6
#2Satoru Kato (Nagoya University)H-Index: 9
Last.Ichiro Hatta (Nagoya University)H-Index: 16
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Abstract The ripple structure of 1,2-dimyristoyl- l -phosphatidylcholine (DMPC) multibilayer containing excess water (60 wt%) was studied by synchrotron X-ray small-angle diffraction. The (0,1) spacing which corresponds to the ripple repeat distance depends on temperature: At 13°C the (0,1) spacing is 14.15 nm, the spacing decreases at higher temperatures and reaches 12.1 nm at 23.5°C, just below the main transition temperature. The spacing is in good agreement between heating process and coolin...
19 CitationsSource
#1Sinzi MatuokaH-Index: 6
#2Ichiro HattaH-Index: 26
Synchrotron X-ray scattering experiments make it possible to investigate dynamic structural changes in biological materials. This extremely high intense X-ray source is applied to the study of hydrated phospholipid multilamellar vesicles which undergo phase transitions. Time-resolved X-ray scattering experiments after temperature jump make clear the kinetics of the phase transitions. Real time X-ray scattering experiments at low temperature scan rates are the powerful methods for observing trans...
Source
#1Sinzi MatuokaH-Index: 6
#2Ichiro HattaH-Index: 26
Study on well oriented phospholipid multibilayers is important in getting an evidence for their structures in detail because it is possible to assign the X-ray scattering direction and therefore to give the configuration of molecules. Very high resolution X-ray diffraction experiment for oriented multibilayers is accessible using synchrotron X-ray beam. Recently the Bragg peaks reflected by a monolayer were observed by making the best of extremely high intensity of synchrotron X-ray beam.
Source
#1Sinzi Matuoka (Nagoya University)H-Index: 6
#2Harumi Asami (Nagoya University)H-Index: 1
Last.Kenichi Yoshikawa (Nagoya University)H-Index: 54
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Abstract The regularity of the bilayer structure was compared between dipalmitoylphosphatidic acid (DPPA) Langmuir-Blodgett (LB) films and “oriented multilayers” of DPPA, using X-ray diffraction and electron spectroscopy for chemical analysis (ESCA). The angular variation of the (001) Bragg spot due to the irregularity of the lamellar repeat was remarkable in the system of oriented multilayers. In contrast, the spot of DPPA LB films exhibited only a slight angular variation, suggesting a regular...
8 CitationsSource
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