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Arisawa M, Yoshida M, Fukumoto K, Sawato T, Yamaguchi M, Matsubara M, Kanie K. Three‐state Structural Switching and Selective Molecular Interactions of Cylindrical Concentric Monodomain Liquid Crystal Elastomer. ChemistrySelect 2021. [DOI: 10.1002/slct.202103490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mieko Arisawa
- Department of Organic Chemistry Graduate School of Pharmaceutical Sciences Tohoku University, Aoba Sendai 980-8578 Japan
- Department of Bioscience and Biotechnology Graduate School of Bioresource and Bioenviromental Sciences Kyushu University Fukuoka 819-0395 Japan
| | - Miyu Yoshida
- Department of Organic Chemistry Graduate School of Pharmaceutical Sciences Tohoku University, Aoba Sendai 980-8578 Japan
| | - Kohei Fukumoto
- Department of Organic Chemistry Graduate School of Pharmaceutical Sciences Tohoku University, Aoba Sendai 980-8578 Japan
| | - Tsukasa Sawato
- Department of Organic Chemistry Graduate School of Pharmaceutical Sciences Tohoku University, Aoba Sendai 980-8578 Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry Graduate School of Pharmaceutical Sciences Tohoku University, Aoba Sendai 980-8578 Japan
| | - Masaki Matsubara
- Institute of Multidisciplinary Research for Advanced Materials Tohoku University, Aoba Sendai 980-8577 Japan
| | - Kiyoshi Kanie
- Institute of Multidisciplinary Research for Advanced Materials Tohoku University, Aoba Sendai 980-8577 Japan
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Sawato T, Arisawa M, Yamaguchi M. Reversible Formation of Self-Assembly Gels Containing Giant Vesicles in Trifluoromethylbenzene Using Oxymethylenehelicene Oligomers with Terminal C16 Alkyl Groups. BCSJ 2020. [DOI: 10.1246/bcsj.20200164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
| | - Mieko Arisawa
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan
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Sawato T, Yamaguchi M. Synthetic Chemical Systems Involving Self‐Catalytic Reactions of Helicene Oligomer Foldamers. Chempluschem 2020; 85:2017-2038. [DOI: 10.1002/cplu.202000489] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/18/2020] [Indexed: 12/15/2022]
Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry Graduate School of Pharmaceutical Sciences Tohoku University Aoba Sendai 980-8578 Japan
| | - Masahiko Yamaguchi
- State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 China
- Department of Organic Chemistry Graduate School of Pharmaceutical Sciences Tohoku University Aoba Sendai 980-8578 Japan
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Sawato T, Yamaguchi M. Sequential self‐catalytic reactions in the formation of hetero‐double‐helix and their self‐assembled gels by pseudoenantiomer mixtures of ethynylhelicene oligomers. Chirality 2020; 32:824-832. [DOI: 10.1002/chir.23224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 03/14/2020] [Accepted: 03/20/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry, Graduate School of Pharmaceutical SciencesTohoku University Sendai Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical SciencesTohoku University Sendai Japan
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Sawato T, Iwamoto R, Yamaguchi M. Figure-eight thermal hysteresis of aminomethylenehelicene oligomers with terminal C 16 alkyl groups during hetero-double-helix formation. Chem Sci 2020; 11:3290-3300. [PMID: 34122836 PMCID: PMC8157274 DOI: 10.1039/c9sc06496f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 02/25/2020] [Indexed: 11/28/2022] Open
Abstract
1 : 1 mixtures of aminomethylenehelicene (P)-tetramer and (M)-pentamer with terminal C16 alkyl groups in fluorobenzene showed structural changes between hetero-double-helices B and C and random-coils 2A. Figure-eight thermal hysteresis appeared when the solution was cooled and heated at a constant rate and involved the crossing of cooling and heating curves in Δε/temperature profiles. This unusual thermal hysteresis emerged in the intermediate state between counterclockwise and clockwise thermal hystereses. This phenomenon arose from the competition between self-catalytic reactions to form B and C from 2A. Significant effects of terminal C16 alkyl groups on the thermodynamic and kinetic phenomena are also described.
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Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81 22-795-6811
| | - Rina Iwamoto
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81 22-795-6811
| | - Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81 22-795-6811
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Sawato T, Yuzawa R, Kobayashi H, Saito N, Yamaguchi M. Formation and dissociation of synthetic hetero-double-helix complex in aqueous solutions: significant effect of water content on dynamics of structural change. RSC Adv 2019; 9:29456-29462. [PMID: 35528401 PMCID: PMC9071914 DOI: 10.1039/c9ra06073a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 09/08/2019] [Indexed: 11/21/2022] Open
Abstract
A 1 : 1 mixture of the ethynylhelicene pseudoenantiomers (M)-tetramer and (P)-pentamer, which possess hydrophilic terminal tri(ethyleneglycol) (TEG) groups, changes their structures in the water-THF (10 μM) solvent system between dissociated random-coils and an associated hetero-double-helix upon heating and cooling. A small change in water content between 30 and 33% significantly affects the dynamics of structural changes. At 30% water content, heating to 60 °C causes rapid formation of random-coil and cooling to 10 °C causes the rapid formation of hetero-double-helix, accompanied by repeated changes in Δε at 369 nm between 0 and -2000 cm-1 M-1. Heating and cooling experiments at constant rates between 60 and 10 °C resulted in sigmoidal curves in Δε/temperature profiles, which indicate rapid structural changes. Different phenomena occurred at 33% water content. Heating to 60 °C and cooling to 0 °C initially induced changes in Δε between 0 and -2000 cm-1 M-1, and repeated cycles gradually reduced the range between 0 and -500 cm-1 M-1. Heating and cooling experiments at constant rates between 60 and 10 °C caused small changes in Δε, and repeated cycles at 10 °C gradually increased Δε to -500 cm-1 M-1. These phenomena involved rapid changes in molecular structure and slow structural changes in the water-THF solvent system. The sharp switching of the dynamics of structural changes at water content between 30 and 33% indicated discontinuous structural changes in the hydration of TEG and/or in water clusters in the vicinity of oligomer molecules.
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Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81-22-795-6811
| | - Ryosuke Yuzawa
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81-22-795-6811
| | - Higashi Kobayashi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81-22-795-6811
| | - Nozomi Saito
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81-22-795-6811
| | - Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba Sendai 980-8578 Japan +81-22-795-6811
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Sawato T, Saito N, Yamaguchi M. Chemical Systems Involving Two Competitive Self-Catalytic Reactions. ACS Omega 2019; 4:5879-5899. [PMID: 31459737 PMCID: PMC6648109 DOI: 10.1021/acsomega.9b00133] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 03/13/2019] [Indexed: 06/10/2023]
Abstract
Self-catalytic reactions are chemical phenomena, in which a product catalyzes the reactions of substrates further to yield products. A significant amplification of product concentration occurs during the reactions in a dilute solution, which exhibit notable properties such as sigmoidal kinetics, seeding effects, and thermal hysteresis. Chemical systems involving two competitive self-catalytic reactions can be considered, in which the competitive formation of two products occurs, which is affected by environmental changes, subtle perturbations, and fluctuations, and notable chemical phenomena appear such as formation of different structures in response to slow/fast temperature changes, chiral symmetry breaking, shortcut in reaction time, homogeneous-heterogeneous transitions, and mechanical responses. Studies on such chemical systems provide understanding on biological systems and can also be extended to the development of novel functional materials.
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Sawato T, Saito N, Yamaguchi M. Proximate stochastic chiral symmetry breaking is mechanically tunable: formation of enantiomeric hetero-double-helices and aggregates from racemic oxymethylenehelicene oligomers. Phys Chem Chem Phys 2019; 21:25406-25414. [DOI: 10.1039/c9cp04299g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mixture of oxymethylenehelicene (P)-hexamer and (M)-hexamer in solution exhibited chiral symmetry breaking, which was induced by mechanical stirring, during the formation of enantiomeric hetero-double-helices and their aggregates.
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Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - Nozomi Saito
- Department of Organic Chemistry
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry
- Graduate School of Pharmaceutical Sciences
- Tohoku University
- Sendai 980-8578
- Japan
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Sawato T, Shinozaki Y, Saito N, Yamaguchi M. Chemical CD oscillation and chemical resonance phenomena in a competitive self-catalytic reaction system: a single temperature oscillation induces CD oscillations twice. Chem Sci 2018; 10:1735-1740. [PMID: 30842838 PMCID: PMC6368240 DOI: 10.1039/c8sc03109f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 11/29/2018] [Indexed: 11/21/2022] Open
Abstract
Chemical CD oscillation and chemical resonance phenomena appear in a competitive chemical reaction system involving amplification. A pseudoenantiomeric mixture of an aminomethylenehelicene (P)-tetramer and an (M)-hexamer in toluene forms three states, namely hetero-double-helix B, hetero-double-helix C, and dissociated random-coil 2A. When the temperature of the solution is oscillated between -5 and 38 °C at a rate of 2 K min-1, Δε reaches maxima twice during a single temperature oscillation, which is called a chemical CD oscillation phenomenon. The phenomenon arises from the sharp competition between the two self-catalytic 2A + C-to-2C and 2A + B-to-2B reactions. In addition, the chemical CD oscillation appears, when temperature oscillation occurs at a rate of 2 K min-1, and higher and lower rates provide a single maximum, a process referred to as the chemical resonance phenomenon. The changes in concentration induced by temperature oscillation repeatedly crossed equilibrium.
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Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry , Graduate School of Pharmaceutical Sciences , Tohoku University , Aoba , Sendai 980-8578 , Japan .
| | - Yasuhiro Shinozaki
- Department of Organic Chemistry , Graduate School of Pharmaceutical Sciences , Tohoku University , Aoba , Sendai 980-8578 , Japan .
| | - Nozomi Saito
- Department of Organic Chemistry , Graduate School of Pharmaceutical Sciences , Tohoku University , Aoba , Sendai 980-8578 , Japan .
| | - Masahiko Yamaguchi
- Department of Organic Chemistry , Graduate School of Pharmaceutical Sciences , Tohoku University , Aoba , Sendai 980-8578 , Japan .
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Saito N, Kondo Y, Sawato T, Shigeno M, Amemiya R, Yamaguchi M. Pendant-Type Helicene Oligomers with p-Phenylene Ethynylene Main Chains: Synthesis, Reversible Formation of Ladderlike Bimolecular Aggregates, and Control of Intramolecular and Intermolecular Aggregation. J Org Chem 2017; 82:8389-8406. [PMID: 28686027 DOI: 10.1021/acs.joc.7b00824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Pendant-type (P)-helicene oligomers with p-phenylene ethynylene main chains up to a tetramer were synthesized by a building block method. The (P)-tetramer reversibly formed a ladderlike bimolecular aggregate upon cooling and disaggregated upon heating in (trifluoromethyl)benzene. Two bis(tetramer)s, in which two (P)-tetramers were connected by hexadecamethylene linkers, were also synthesized. The head-to-tail bis(tetramer) formed an intramolecular aggregate, and the head-to-head bis(tetramer) formed an intermolecular aggregate in toluene. The results suggest the antiparallel aggregation structure of the pendant-type (P)-tetramers. The structure of the linker was proven to be effective in controlling intramolecular and intermolecular aggregations.
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Affiliation(s)
- Nozomi Saito
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aoba, Sendai 980-8578, Japan
| | - Yutaro Kondo
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aoba, Sendai 980-8578, Japan
| | - Tsukasa Sawato
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aoba, Sendai 980-8578, Japan
| | - Masanori Shigeno
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aoba, Sendai 980-8578, Japan
| | - Ryo Amemiya
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aoba, Sendai 980-8578, Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University , Aoba, Sendai 980-8578, Japan
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Sawato T, Yagi A, Arisawa M, Yamaguchi M. Chemical braking exhibited by ethynylhelicene ( M )-nonamer in solution: Competitive reaction system of self-catalysis to form double-helix and approach towards equilibrium to form random-coil. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sawato T, Saito N, Shigeno M, Yamaguchi M. Mechanical Stirring Induces Heteroaggregate Formation and Self-assembly of Pseudoenantiomeric Oxymethylene Helicene Oligomers in Solution. ChemistrySelect 2017. [DOI: 10.1002/slct.201700303] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Tsukasa Sawato
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3 Aoba Sendai 980-8578 Japan
| | - Nozomi Saito
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3 Aoba Sendai 980-8578 Japan
| | - Masanori Shigeno
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3 Aoba Sendai 980-8578 Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3 Aoba Sendai 980-8578 Japan
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Kushida Y, Sawato T, Saito N, Shigeno M, Satozono H, Yamaguchi M. Spatially Heterogeneous Nature of Self-Catalytic Reaction in Hetero-Double Helix Formation of Helicene Oligomers. Chemphyschem 2016; 17:3283-3288. [DOI: 10.1002/cphc.201600627] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Indexed: 01/16/2023]
Affiliation(s)
- Yo Kushida
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University, Aoba; Sendai 980-8578 Japan
| | - Tsukasa Sawato
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University, Aoba; Sendai 980-8578 Japan
| | - Nozomi Saito
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University, Aoba; Sendai 980-8578 Japan
| | - Masanori Shigeno
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University, Aoba; Sendai 980-8578 Japan
| | - Hiroshi Satozono
- Central Research Laboratory; Hamamatsu Photonics K. K. Hamakita, Hamamatsu; Shizuoka 434-8601 Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry; Graduate School of Pharmaceutical Sciences; Tohoku University, Aoba; Sendai 980-8578 Japan
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Kushida Y, Sawato T, Shigeno M, Saito N, Yamaguchi M. Deterministic and Stochastic Chiral Symmetry Breaking Exhibited by Racemic Aminomethylenehelicene Oligomers. Chemistry 2016; 23:327-333. [PMID: 27440722 DOI: 10.1002/chem.201601792] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Indexed: 11/09/2022]
Abstract
Racemic mixtures of aminomethylenehelicene (P)- and (M)-pentamers exhibited deterministic and stochastic chiral symmetry breaking during hetero-double-helix formation and self-assembly in solution. Heating a 50:50 mixture of (P)- and (M)-pentamers at 90 °C, and then cooling the mixture to 70 °C resulted in hetero-double-helix formation; a Cotton effect with negative Δε at λ=315 nm appeared. Chiral self-assembly occurred when the mixture was cooled to 25 °C. A strong tendency of deterministic chiral symmetry breaking appeared at the molecular and self-assembled levels, which was indicated by the negative Δε at λ=315 nm that appeared in most cases in repeated experiments. Mixtures containing 60:40 and 40:60 (P)-/(M)-pentamers also self-assembled with the same chirality. When a homo-double-helix (P)-/(M)-pentamer and a random coil (M)-/(P)-pentamer were mixed, the chiral self-assembly formed stochastically, and heating and cooling resulted in deterministic chiral symmetry breaking.
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Affiliation(s)
- Yo Kushida
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba, Sendai, 980-8578, Japan
| | - Tsukasa Sawato
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba, Sendai, 980-8578, Japan
| | - Masanori Shigeno
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba, Sendai, 980-8578, Japan
| | - Nozomi Saito
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba, Sendai, 980-8578, Japan
| | - Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University Aoba, Sendai, 980-8578, Japan
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Shigeno M, Sawato T, Yamaguchi M. Fibril Film Formation of Pseudoenantiomeric Oxymethylenehelicene Oligomers at the Liquid-Solid Interface: Structural Changes, Aggregation, and Discontinuous Heterogeneous Nucleation. Chemistry 2015; 21:17676-82. [DOI: 10.1002/chem.201503224] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Indexed: 12/21/2022]
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Yamazaki S, Kodaira S, Oba S, Yuda H, Keita K, Sawato T, Ueno M. [A study on drinking and problem drinking in tuberculosis patients]. Nihon Koshu Eisei Zasshi 1993; 40:123-7. [PMID: 8477095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Drinking and problem drinking were studied in 43 tuberculosis patients with the following results. The results of the KAST (Kurihama Alcoholism Screening Test) revealed that 10% of the patients were severe problem drinkers (diagnosed as alcohol dependent syndrome), 7% of the patients had drinking problems and 17% were potential problem drinkers. These percentages are higher than those of the general adult population. In the cases having higher KAST scores, the time between the onset of subjective symptoms and the first medical examination were long, but the time between the first medical examination and diagnosed tuberculosis was short. Severe tuberculosis patients showed higher KAST scores. It was assumed that tuberculosis patients who drink too heavily or are problem drinkers, were apt to put off consulting a physician, and as a result, the condition of tuberculosis would be more severe when they finally did see a physician. In the field of tuberculosis prevention and medical treatment, professionals should pay more attention to drinking and alcoholism. The need to stay sober is important in both preventing relapses and supporting recovery from tuberculosis.
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Kokusho S, Iizuka A, Sawato T, Sano T, Sakamoto Y. [Vectorcardiography and spathol velocity ECG in experimental diffuse myocardiopathy]. Nihon Rinsho 1976; 34:2903-6. [PMID: 1033328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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