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Your search keyword '"Masashi Sonoyama"' showing total 7 results
Start Over Author "Masashi Sonoyama" Publisher the chemical society of japan
7 results on '"Masashi Sonoyama"'

1. Thermotropic Transition Behaviors of Novel Partially Fluorinated Dimyristoylphosphatidylcholines with Different Perfluoroalkyl Chain Lengths

Author

Hideki Amii, Miki Horikoshi, Toshiyuki Takagi, Hiroshi Takahashi, Takeshi Hasegawa, Tamami Yanagi, Kohei Morita, and Masashi Sonoyama

Subjects
Crystallography, Membrane, Chain (algebraic topology), 010405 organic chemistry, Chemistry, digestive, oral, and skin physiology, lipids (amino acids, peptides, and proteins), General Chemistry, 010402 general chemistry, Lipid bilayer, 01 natural sciences, Thermotropic crystal, 0104 chemical sciences
Abstract

A comparative study on the thermotropic transition of phospholipid bilayer membrane is carried out for a series of novel partially fluorinated dimyristoylphosphatidylcholines with different perfluo...

Published
2019
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2. An Origin of Complicated Infrared Spectra of Perfluoroalkyl Compounds Involving a Normal Alkyl Group

Author

Toshiyuki Takagi, Hideki Amii, Takeshi Hasegawa, Yuki Tanaka, Masashi Sonoyama, Toshiyuki Kanamori, Takafumi Shimoaka, Nobutaka Shioya, and Kohei Morita

Subjects
chemistry.chemical_classification, Chemistry, Group (periodic table), Infrared, Yield (chemistry), Infrared spectroscopy, General Chemistry, Photochemistry, Medicinal chemistry, Alkyl
Abstract

Perfluoroalkyl (Rf) compounds containing a normal alkyl group often yield highly complicated infrared (IR) spectra especially in the C–F stretching vibration (νC–F) region. To reveal the reason behind this, the IR p-polarized multiple-angle incidence resolution spectrometry (pMAIRS) is employed to measure a monolayer of CF3(CF2)9(CH2)3COOH deposited on a silicon substrate. The compound is known to spontaneously aggregate to form a molecular assembly with the closest packing, in which the molecules are oriented perpendicular to the substrate. The IR pMAIRS spectra apparently prove that the complexity of the νC–F region is due to the normal alkyl part directly connected to the Rf group because the carbons in the Rf group are vibrated as a coupled oscillator, and the oscillation of the alkyl part propagates to the Rf part along the molecular axis.

Published
2015

3. Effect of Partial Fluorination in the Myristoyl Groups on Thermal and Interfacial Properties of Dimyristoylphosphatidylcholine

Author

Hiroshi Takahashi, Toshiyuki Takagi, Hideki Amii, Toshiyuki Kanamori, Masashi Sonoyama, Kohei Morita, Teruhiko Baba, and Masaru Yoshino

Subjects
Crystallography, Chemistry, Substitution (logic), Thermal, Fluorine, chemistry.chemical_element, General Chemistry, Myristoylation
Abstract

A novel partially fluorinated analog of DMPC, diF4H10-PC, was synthesized, and its thermal and interfacial properties were compared with those of DMPC. By fluorine substitution in the terminal buty...

Published
2012
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4. Highly Stable Solubilization of Membrane Protein Bacteriorhodopsin with a Short-chain Phospholipid Diheptanoylphosphatidylcholine

Author

Masashi Sonoyama, Mina Fukumoto, and Yumiko Kuwabara

Subjects
chemistry.chemical_compound, Chromatography, chemistry, Membrane protein, biology, Chain (algebraic topology), Solubilization, Phosphatidylcholine, Phospholipid, biology.protein, Bacteriorhodopsin, General Chemistry
Abstract

A short-chain phosphatidylcholine, diheptanoyl PC (diC7 PC), was employed for solubilizing a membrane protein bacteriorhodopsin (bR). Highly stable and efficient solubilization of bR was accomplish...

Published
2010
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5. Effect of Molecular Assembly on Photocycle of Reconstituted Bacteriorhodopsin: Significant Blue Shift of the Late M Photointermediate in the Liquid Crystalline Phase

Author

Shigeki Mitaku, Takashi Kikukawa, Makoto Demura, Yasunori Yokoyama, Naoki Kamo, and Masashi Sonoyama

Subjects
genetic structures, biology, Absorption spectroscopy, Chemistry, Liquid crystalline, Vesicle, Bacteriorhodopsin, General Chemistry, Photochemistry, Blueshift, Crystallography, Phase (matter), biological sciences, biology.protein, natural sciences
Abstract

The photocycle of bacteriorhodopsin (bR) reconstituted into dimyristoylphosphatidylcholine vesicles was investigated with transient visible absorption spectroscopy. The measured time-resolved diffe...

Published
2009
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6. Bisphenol A Weakens Calcium Binding Affinity of Sites III and IV in C-Terminal Domain of Bovine Brain Calmodulin

Author

Mihoko Tomida, Yasunori Yokoyama, Masayuki Nara, Sadayuki Matsuda, Masashi Sonoyama, Tomoyoshi Terada, and Koichi Murayama

Subjects
Bisphenol A, Calmodulin, biology, Titration curve, Chemistry, Stereochemistry, C-terminus, chemistry.chemical_element, General Chemistry, Calcium, Fluorescence, chemistry.chemical_compound, Bovine brain, Biochemistry, biology.protein
Abstract

Ca2+-binding affinity of sites III and IV in C-terminal domain of calmodulin in the presence and absence of BPA using intrinsic Tyr fluorescence is reported. The titration curves were lower shifted...

Published
2009
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7. First Observation of Precursory Structural Changes of Aliphatic Parts in the α-γ Polymorphic Transition of DL-Norleucine by Temperature-Scanning Time-Resolved FT-IR Spectroscopy

Author

Masayuki Matsumoto, Itaru Tsukushi, Masashi Sonoyama, Tadahiro Ishii, Tatsuhiko Nakano, and Hirofumi Yajima

Subjects
chemistry.chemical_compound, Crystallography, Transition (genetics), Chemistry, Norleucine, Ft ir spectroscopy, Analytical chemistry, General Chemistry, Spectroscopy
Abstract

Polymorphic transition of DL-norleucine from the α-form to the γ-form was investigated with temperature-scanning time-resolved FT-IR spectroscopy. The dynamic FT-IR measurements revealed the precursory structural changes in the aliphatic parts prior to the main overall polymorphic transition.

Published
2000
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