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13 results on '"Akinori Honda"'

1. Toward flame retardants or thermal stabilizers with new mechanism for polymers

Author

Takashiro Akitsu, Akinori Honda, Taiga Imae, and Yuya Higashi

Subjects
Polymer, Flame retardants, Thermal stabilizers, Phase transition, Cold crystallization, Explosives and pyrotechnics, TP267.5-301
Abstract

This review discusses conventional flame retardants for polymers and the possibility of using endothermal materials as flame retardants. Halogen-based, phosphorus-based, inorganic compounds, and their combinations are generally used as flame retardants for polymeric materials. The mechanism of action involves the trapping of radicals in the gas phase, an endothermic dehydration reaction, the blocking of oxygen, and a heat insulation effect by char in the solid phase. We discuss the possibility of using low-molecular-weight organic (or inorganic) metal complexes, exhibiting unique endothermic phenomena, such as phase transitions and cold crystallization, as flame retardants or thermal stabilizers at lower temperatures. In addition, this review provides an outlook on state-of-the-art) polymer flame-retardant technology.

Published
2023
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5. Alkyl substituent-dependent systematic change in cold crystallization of azo molecules

Author

Akinori Honda, Yukie Hibi, Kazuma Matsumoto, Masato Kawai, and Kazuo Miyamura

Subjects
General Chemical Engineering, lipids (amino acids, peptides, and proteins), sense organs, General Chemistry, skin and connective tissue diseases
Abstract

The change in alkyl substitution position and alkyl chain length of azo molecules led to the variation in cold crystallization behavior.

Published
2022
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6. Cold Crystallization and Polymorphism Triggered by the Mobility of the Phenyl Group in Alkyl Azo Dye Molecules

Author

Shunta Kakihara, Tomomi Takahashi, Masato Kawai, Akinori Honda, and Kazuo Miyamura

Subjects
chemistry.chemical_classification, Materials science, General Chemistry, Condensed Matter Physics, law.invention, chemistry.chemical_compound, chemistry, Polymorphism (materials science), law, Polymer chemistry, Phenyl group, Molecule, General Materials Science, Crystallization, Alkyl
Published
2021
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9. SS2-4 High resolution infrared imaging of composite materials

Author

Kiyoka Takagi, Hiroko Hiramoto, Noriko Yamazaki, Koji Ishida, Akinori Honda, Hiroshi Itoh, and Koichi Hasegawa

Subjects
Materials science, Structural Biology, Infrared, business.industry, High resolution, Optoelectronics, Radiology, Nuclear Medicine and imaging, business, Instrumentation
Published
2019
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10. Surface Structures Formed by a Copper(II) Complex of Alkyl-Derivatized Indigo

Author

Akinori Honda, Keisuke Noda, Kazuo Miyamura, and Yoshinori Tamaki

Subjects
Stereochemistry, Metal ions in aqueous solution, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, lcsh:Technology, Article, Indigo, law.invention, law, scanning tunneling microscope, mordanting, General Materials Science, Lamellar structure, indigo, lcsh:Microscopy, Alkyl, lcsh:QC120-168.85, chemistry.chemical_classification, dye, lcsh:QH201-278.5, lcsh:T, alkyl chain, 021001 nanoscience & nanotechnology, Copper, 0104 chemical sciences, Crystallography, chemistry, copper, lcsh:TA1-2040, lcsh:Descriptive and experimental mechanics, lcsh:Electrical engineering. Electronics. Nuclear engineering, Dyeing, Scanning tunneling microscope, 0210 nano-technology, Chirality (chemistry), lcsh:Engineering (General). Civil engineering (General), lcsh:TK1-9971
Abstract

Assembled structures of dyes have great influence on their coloring function. For example, metal ions added in the dyeing process are known to prevent fading of color. Thus, we have investigated the influence of an addition of copper(II) ion on the surface structure of alkyl-derivatized indigo. Scanning tunneling microscope (STM) analysis revealed that the copper(II) complexes of indigo formed orderly lamellar structures on a HOPG substrate. These lamellar structures of the complexes are found to be more stable than those of alkyl-derivatized indigos alone. Furthermore, 2D chirality was observed.

Published
2016

11. Effect of colestimide on the concentrations of polychlorinated dibenzo-p-dioxins, polychlorinated dizenzofurans, and polychlorinated biphenyls in blood of Yusho patients

Author

Masami Imaji, Masutaka Furue, Chikage Mitoma, Takashi Todaka, Yoshiko Takao, and Akinori Honda

Subjects
0301 basic medicine, PCDFs, Male, PCDDs, Polychlorinated Dibenzodioxins, Health, Toxicology and Mutagenesis, Physiology, 010501 environmental sciences, Blood concentration, Colestimide, 01 natural sciences, 03 medical and health sciences, Porphyrias, Medicine, Humans, PCBs, Yusho, 0105 earth and related environmental sciences, Aged, Aged, 80 and over, business.industry, 030111 toxicology, Research, Public Health, Environmental and Occupational Health, Imidazoles, food and beverages, Dibenzofurans, Polychlorinated, Middle Aged, Polychlorinated Biphenyls, stomatognathic diseases, Resins, Synthetic, Congener, Polychlorinated Dibenzo-p-dioxins, Environmental Pollutants, Epichlorohydrin, Female, business, Arithmetic mean
Abstract

Background Oral colestimide was reported to lower the concentration of PCDDs, PCDFs, and PCB in the blood of humans. A pilot study showed that the arithmetic mean total TEQ concentrations of PCDDs, PCDFs, and PCBs in the blood of subjects after the trial decreased approximately 20 % compared to pre-trial levels, suggesting that colestimide could decrease human dioxin levels. We designed the current clinical trial study based on this information. In this study, we examined whether colestimide could reduce the individual congener concentrations of PCDDs, PCDFs, and PCBs in the blood of Yusho patients. Methods Out of the 36 Yusho patients who participated in the clinical trial, 26 patients self-administered colestimide 3 g/day orally for 6 months. The concentrations of PCDDs, PCDFs and PCBs in the blood of 26 Yusho patients before the trial were compared with those after the trial. Results The arithmetic mean total TEQ concentrations of PCDDs, PCDFs, non-ortho PCBs, and mono-ortho PCBs in the blood of the 26 Yusho patients before and after the clinical trial were 42–303 (mean: 130, median: 120) and 43–283 (mean: 132, median: 118) pg TEQ/g lipid, respectively. The sums of the concentrations of 58 PCB congeners measured in the blood of Yusho patients before and after the trial were 321–2643 (mean: 957, median: 872) and 286–2007 (mean: 975, median: 806) ng/g lipid, respectively, indicating that the concentrations of PCDDs, PCDFs, and PCBs after the trial were almost the same as those before the trial. Among congeners of PCDDs, PCDFs, dioxin-like PCBs, and non-dioxin-like PCBs, most congeners of these compounds did not show a statistically significant decrease after the trial. Conclusion Colestimide may not be beneficial in reducing the high blood levels of dioxin-like compounds in Yusho patients.

Published
2016

12. Effect of colestimide on the concentrations of polychlorinated dibenzo-p-dioxins, polychlorinated dizenzofurans, and polychlorinated biphenyls in blood of Yusho patients.

Author

Takashi Todaka, Akinori Honda, Masami Imaji, Yoshiko Takao, Chikage Mitoma, Masutaka Furue, Todaka, Takashi, Honda, Akinori, Imaji, Masami, Takao, Yoshiko, Mitoma, Chikage, and Furue, Masutaka

Subjects
*POLYCHLORINATED dibenzodioxins, *POLYCHLORINATED dibenzofurans, *POLYCHLORINATED biphenyls, *BLOOD testing, *DIOXINS, *CLINICAL drug trials, *BLOOD sugar analysis, *CLINICAL trials, *COMPARATIVE studies, *ETHERS, *SYNTHETIC gums & resins, *IMIDAZOLES, *RESEARCH methodology, *MEDICAL cooperation, *POLLUTANTS, *PORPHYRIA, *RESEARCH, *EVALUATION research, *PHARMACODYNAMICS
Abstract

Background: Oral colestimide was reported to lower the concentration of PCDDs, PCDFs, and PCB in the blood of humans. A pilot study showed that the arithmetic mean total TEQ concentrations of PCDDs, PCDFs, and PCBs in the blood of subjects after the trial decreased approximately 20 % compared to pre-trial levels, suggesting that colestimide could decrease human dioxin levels. We designed the current clinical trial study based on this information. In this study, we examined whether colestimide could reduce the individual congener concentrations of PCDDs, PCDFs, and PCBs in the blood of Yusho patients.Methods: Out of the 36 Yusho patients who participated in the clinical trial, 26 patients self-administered colestimide 3 g/day orally for 6 months. The concentrations of PCDDs, PCDFs and PCBs in the blood of 26 Yusho patients before the trial were compared with those after the trial.Results: The arithmetic mean total TEQ concentrations of PCDDs, PCDFs, non-ortho PCBs, and mono-ortho PCBs in the blood of the 26 Yusho patients before and after the clinical trial were 42-303 (mean: 130, median: 120) and 43-283 (mean: 132, median: 118) pg TEQ/g lipid, respectively. The sums of the concentrations of 58 PCB congeners measured in the blood of Yusho patients before and after the trial were 321-2643 (mean: 957, median: 872) and 286-2007 (mean: 975, median: 806) ng/g lipid, respectively, indicating that the concentrations of PCDDs, PCDFs, and PCBs after the trial were almost the same as those before the trial. Among congeners of PCDDs, PCDFs, dioxin-like PCBs, and non-dioxin-like PCBs, most congeners of these compounds did not show a statistically significant decrease after the trial.Conclusion: Colestimide may not be beneficial in reducing the high blood levels of dioxin-like compounds in Yusho patients. [ABSTRACT FROM AUTHOR]

Published
2016
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