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  1. Article ; Online: In Vivo Vortex Imaging of Bladder.

    Mizuno, Hideki / Matsumoto, Seiji / Yamamoto, Tokunori

    JMA journal

    2023  Volume 7, Issue 1, Page(s) 122–124

    Language English
    Publishing date 2023-11-16
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 3053329-6
    ISSN 2433-3298 ; 2433-328X
    ISSN (online) 2433-3298
    ISSN 2433-328X
    DOI 10.31662/jmaj.2023-0134
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  2. Article ; Online: GenIce-core: Efficient algorithm for generation of hydrogen-disordered ice structures.

    Matsumoto, Masakazu / Yagasaki, Takuma / Tanaka, Hideki

    The Journal of chemical physics

    2024  Volume 160, Issue 9

    Abstract: Ice is different from ordinary crystals because it contains randomness, which means that statistical treatment based on ensemble averaging is essential. Ice structures are constrained by topological rules known as the ice rules, which give them unique ... ...

    Abstract Ice is different from ordinary crystals because it contains randomness, which means that statistical treatment based on ensemble averaging is essential. Ice structures are constrained by topological rules known as the ice rules, which give them unique anomalous properties. These properties become more apparent when the system size is large. For this reason, there is a need to produce a large number of sufficiently large crystals that are homogeneously random and satisfy the ice rules. We have developed an algorithm to quickly generate ice structures containing ions and defects. This algorithm is provided as an independent software module that can be incorporated into crystal structure generation software. By doing so, it becomes possible to simulate ice crystals on a previously impossible scale.
    Language English
    Publishing date 2024-03-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0198056
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  3. Article ; Online: Cage occupancies of CH4, CO2, and Xe hydrates: Mean field theory and grandcanonical Monte Carlo simulations.

    Tanaka, Hideki / Matsumoto, Masakazu / Yagasaki, Takuma

    The Journal of chemical physics

    2024  Volume 160, Issue 4

    Abstract: We propose a statistical mechanical theory for the thermodynamic stability of clathrate hydrates, considering the influence of the guest-guest interaction on the occupancies of the cages. A mean field approximation is developed to examine the magnitude ... ...

    Abstract We propose a statistical mechanical theory for the thermodynamic stability of clathrate hydrates, considering the influence of the guest-guest interaction on the occupancies of the cages. A mean field approximation is developed to examine the magnitude of the influence. Our new method works remarkably well, which is manifested by two sorts of grandcanonical Monte Carlo (GCMC) simulations. One is full GCMC, and the other is designed in the present study for clathrate hydrates, called lattice-GCMC, in which each guest can be adsorbed at one of the centers of the cage. In the latter simulation, only the guest-guest interaction is explicitly treated, incorporating the host-guest interaction into the free energy of the cage occupation without other guests. Critical phenomena for guest species, such as large density fluctuations, are observed when the temperature is low or the guest-guest interaction is strong.
    Language English
    Publishing date 2024-01-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0188679
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  4. Article: Therapeutic Effects of Dual Dopaminergic Modulation With l-DOPA and Chlorpromazine in Patients With Idiopathic Cervical Dystonia.

    Matsumoto, Shinichi S / Koizumi, Hidetaka / Shimazu, Hideki / Goto, Satoshi

    Neurology. Clinical practice

    2024  Volume 14, Issue 2, Page(s) e200254

    Abstract: Objectives: Imbalanced activities between dopamine D: Methods: We enrolled 21 patients with CD who responded poorly to botulinum toxin treatment. The severities of CD motor symptoms and CD-associated pain were determined using the Toronto Western ... ...

    Abstract Objectives: Imbalanced activities between dopamine D
    Methods: We enrolled 21 patients with CD who responded poorly to botulinum toxin treatment. The severities of CD motor symptoms and CD-associated pain were determined using the Toronto Western Spasmodic Torticollis Rating Scale and the visual analog scale, respectively.
    Results: In patients with CD (n = 7), oral administration of l-DOPA combined with CPZ significantly attenuated both CD motor symptoms and CD-associated pain in a dose-related manner. By contrast, there was no improvement of CD symptoms in patients (n = 7) who ingested l-DOPA alone nor in those (n = 7) who ingested CPZ alone.
    Discussion: DDM with l-DOPA and CPZ may be an effective tool to treat dystonia symptoms in patients with botulinum toxin-resistant idiopathic CD. Our results may also indicate that CD dystonia symptoms could be attenuated through DDM inducing an increase in striosomal D
    Classification of evidence: This study provides Class III evidence that treatment of botulinum toxin-resistant idiopathic cervical dystonia with l-DOPA and chlorpromazine is superior to either one alone.
    Language English
    Publishing date 2024-01-05
    Publishing country United States
    Document type Case Reports
    ZDB-ID 2645818-4
    ISSN 2163-0933 ; 2163-0402
    ISSN (online) 2163-0933
    ISSN 2163-0402
    DOI 10.1212/CPJ.0000000000200254
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  5. Article: Factors associated with improvement in impaired consciousness during the acute phase of cerebral infarction: a prospective observational study.

    Matsumoto, Koki / Takami, Akiyoshi / Makino, Misato / Yoshida, Hideki

    Journal of physical therapy science

    2023  Volume 35, Issue 10, Page(s) 678–684

    Abstract: Purpose] In this study, we investigated factors that contribute to improvement in impaired consciousness following cerebral infarction. [Participants and Methods] This prospective observational study included 186 patients with cerebral infarction. We ... ...

    Abstract [Purpose] In this study, we investigated factors that contribute to improvement in impaired consciousness following cerebral infarction. [Participants and Methods] This prospective observational study included 186 patients with cerebral infarction. We investigated 21 variables including the rehabilitation status to determine factors that contribute to improvement in impaired consciousness. [Results] Improvement in impaired consciousness was correlated with age, delirium, the Japan Coma Scale score at initiation of rehabilitation, worsening, cerebral edema, and standing practice. [Conclusion] We conclude that the aforementioned factors may serve as predictors of possible improvement and that standing practice may contribute to improvement in impaired consciousness.
    Language English
    Publishing date 2023-10-01
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2038898-6
    ISSN 0915-5287
    ISSN 0915-5287
    DOI 10.1589/jpts.35.678
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  6. Article ; Online: Clinical effects of tranexamic acid on bleeding tendency due to fibrinolytic activation of AL amyloidosis.

    Matsumoto, Gaku / Mori, Hideki / Mori, Takahiro / Sakaki, Chika

    BMJ case reports

    2023  Volume 16, Issue 9

    Abstract: We report a case where tranexamic acid, which is an antifibrinolytic agent, was used to effectively treat bleeding tendency in a patient with immunoglobulin light chain (AL) amyloidosis. A male patient in his 80s without a history of bleeding disorders ... ...

    Abstract We report a case where tranexamic acid, which is an antifibrinolytic agent, was used to effectively treat bleeding tendency in a patient with immunoglobulin light chain (AL) amyloidosis. A male patient in his 80s without a history of bleeding disorders was admitted to our hospital for the examination of bleeding tendency and was diagnosed with a bleeding disorder due to AL amyloidosis. Blood tests revealed elevated plasmin-α2-plasmin inhibitor complex levels, suggesting fibrinolytic activation. Managing the bleeding was difficult; however, we suspected fibrinolytic activation associated with AL amyloidosis and initiated treatment with oral tranexamic acid, which markedly improved the bleeding disorder and abnormalities of the fibrinolytic system. Therefore, in cases of bleeding due to fibrinolytic activation of AL amyloidosis, tranexamic acid administration can be an effective treatment.
    Language English
    Publishing date 2023-09-26
    Publishing country England
    Document type Journal Article
    ISSN 1757-790X
    ISSN (online) 1757-790X
    DOI 10.1136/bcr-2022-254483
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  7. Article ; Online: Efficiency and energy balance for substitution of CH4 in clathrate hydrates with CO2 under multiple-phase coexisting conditions.

    Tanaka, Hideki / Matsumoto, Masakazu / Yagasaki, Takuma

    The Journal of chemical physics

    2023  Volume 159, Issue 19

    Abstract: Many experimental and theoretical studies on CH4-CO2 hydrates have been performed aiming at the extraction of CH4 as a relatively clean energy resource and concurrent sequestration of CO2. However, vague or insufficient characterization of the ... ...

    Abstract Many experimental and theoretical studies on CH4-CO2 hydrates have been performed aiming at the extraction of CH4 as a relatively clean energy resource and concurrent sequestration of CO2. However, vague or insufficient characterization of the environmental conditions prevents us from a comprehensive understanding of even equilibrium properties of CH4-CO2 hydrates for this substitution. We propose possible reaction schemes for the substitution, paying special attention to the coexisting phases, the aqueous and/or the fluid, where CO2 is supplied from and CH4 is transferred to. We address the two schemes for the substitution operating in three-phase and two-phase coexistence. Advantages and efficiencies of extracting CH4 in the individual scheme are estimated from the chemical potentials of all the components in all the phases involved in the substitution on the basis of a statistical mechanical theory developed recently. It is found that although substitution is feasible in the three-phase coexistence, its working window in temperature-pressure space is much narrower compared to the two-phase coexistence condition. Despite that the substitution normally generates only a small amount of heat, a large endothermic substitution is suggested in the medium pressure range, caused by the vaporization of liquid CO2 due to mixing with a small amount of the released CH4. This study provides the first theoretical framework toward the practical use of hydrates replacing CH4 with CO2 and serves as a basis for quantitative planning.
    Language English
    Publishing date 2023-11-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0179655
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  8. Article ; Online: On the phase behaviors of CH4-CO2 binary clathrate hydrates: Two-phase and three-phase coexistences.

    Tanaka, Hideki / Matsumoto, Masakazu / Yagasaki, Takuma

    The Journal of chemical physics

    2023  Volume 158, Issue 22

    Abstract: We develop a statistical mechanical theory on clathrate hydrates in order to explore the phase behaviors of clathrate hydrates containing two kinds of guest species and apply it to CH4-CO2 binary hydrates. The two boundaries separating water and hydrate ... ...

    Abstract We develop a statistical mechanical theory on clathrate hydrates in order to explore the phase behaviors of clathrate hydrates containing two kinds of guest species and apply it to CH4-CO2 binary hydrates. The two boundaries separating water and hydrate and hydrate and guest fluid mixtures are estimated, which are extended to the lower temperature and the higher pressure region far distant from the three-phase coexisting conditions. The chemical potentials of individual guest components can be calculated from free energies of cage occupations, which are available from intermolecular interactions between host water and guest molecules. This allows us to derive all thermodynamic properties pertinent to the phase behaviors in the whole space of thermodynamic variables of temperature, pressure, and guest compositions. It is found that the phase boundaries of CH4-CO2 binary hydrates with water and with fluid mixtures locate between simple CH4 and CO2 hydrates, but the composition ratios of CH4 guests in hydrates are disproportional to those in fluid mixtures. Such differences arise from the affinities of each guest species to the large and small cages of CS-I hydrates and significantly affect occupation of each cage type, which results in a deviation of the guest composition in hydrates from that in fluid on the two-phase equilibrium conditions. The present method provides a basis for the evaluation of the efficiency of the guest CH4 replacement to CO2 at the thermodynamic limit.
    MeSH term(s) Carbon Dioxide/chemistry ; Water/chemistry ; Temperature ; Thermodynamics
    Chemical Substances Carbon Dioxide (142M471B3J) ; Water (059QF0KO0R)
    Language English
    Publishing date 2023-06-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0155143
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  9. Article: Structure Selectivity of Mixed Gas Hydrates and Group 14 Clathrates

    Matsumoto, Masakazu / Tanaka, Hideki

    Energy & fuels. 2022 June 28, v. 36, no. 18

    2022  

    Abstract: The structure selectivity of mixed gas hydrates and group 14 clathrates is examined on the basis of statistical mechanical theories and the empirical rule on the topological constraint of the Frank–Kasper phases. The most stable structure is revealed by ... ...

    Abstract The structure selectivity of mixed gas hydrates and group 14 clathrates is examined on the basis of statistical mechanical theories and the empirical rule on the topological constraint of the Frank–Kasper phases. The most stable structure is revealed by the generalized phase diagram, where the chemical potential differences in the three canonical forms of clathrates are independent variables. The most stable structure incorporating individual guest species is evaluated by the locus of the chemical potential differences on this generalized phase diagram. We show that the method developed here is simple but powerful to estimate roughly phase behaviors of clathrate compounds in a wide range of thermodynamic conditions, which is demonstrated by two applications: the generalized phase diagram of group 14 element clathrates and the phase behavior of mixed gas hydrates. The present theory leads to proposals of phase change agents, of which the addition sensitively influences the structure selectivity, encompassing even minor structures.
    Keywords energy ; loci ; phase transition ; physical phases ; thermodynamics ; topology
    Language English
    Dates of publication 2022-0628
    Size p. 10667-10674.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1483539-3
    ISSN 1520-5029 ; 0887-0624
    ISSN (online) 1520-5029
    ISSN 0887-0624
    DOI 10.1021/acs.energyfuels.2c01337
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  10. Article ; Online: The effect of brown kelp phenology on abalone locomotion and spatial distribution: acoustic telemetry and spatially explicit individual-based model approach

    Matsumoto, Yukio / Takami, Hideki

    Fish Sci. 2022 Nov., v. 88, no. 6 p.693-701

    2022  

    Abstract: In field studies of a species’ population size, the movement and distribution of the target organism beyond the study area affect the population size estimate. Estimates are derived based on the number of animals caught, and catch efficiency changes with ...

    Abstract In field studies of a species’ population size, the movement and distribution of the target organism beyond the study area affect the population size estimate. Estimates are derived based on the number of animals caught, and catch efficiency changes with distribution and locomotion of the animals. This study, using acoustic telemetry and unmanned aerial vehicle (UAV) mapping, revealed that the Ezo abalone, Haliotis discus hannai, alters its distance moved depending on its distance from brown kelp. In addition, we reproduced abalone locomotion and brown kelp phenology as individual-based models. In the model, abalone moved to deeper water during the spring/summer brown kelp growing season, while during autumn/winter, the model showed them moving to shallower water and aggregating around the remaining brown kelp. The timing of moving to shallower area in the model coincided with the fishing season. Fishers mainly catch abalone in shallower areas. Therefore, it is possible that fishing efficiency will not decline later in the fishing season because fishers can catch the abalone immigrating to the main fishing grounds and those aggregating around the brown kelp. Our model indicated the need for improvement in the DeLury method and the catch per unit effort (CPUE) trends used in the abalone fishing industry.
    Keywords Haliotis discus hannai ; abalone ; acoustics ; autumn ; decline ; fish ; industry ; locomotion ; macroalgae ; models ; phenology ; population size ; spring ; summer ; telemetry ; winter
    Language English
    Dates of publication 2022-11
    Size p. 693-701.
    Publishing place Springer Japan
    Document type Article ; Online
    ZDB-ID 1192654-5
    ISSN 1444-2906 ; 0919-9268
    ISSN (online) 1444-2906
    ISSN 0919-9268
    DOI 10.1007/s12562-022-01640-y
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