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  1. AU="Hamamoto, Shoichiro"
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  1. Article: Vertical migration of cesium in weathered granite soil under flowing water condition depending on Cs concentration and states of dissolved organic matter

    Tatsuno, Takahiro / Hamamoto, Shoichiro / Nihei, Naoto / Nishimura, Taku

    Journal of environmental management. 2022 Mar. 15, v. 306

    2022  

    Abstract: After the accident at the Fukushima Daiichi nuclear power plant in Japan, the migration of radioactive cesium (Cs) in soils has become a crucial issue since this can negatively affect human health and the surrounding environment. Dissolved organic matter ...

    Abstract After the accident at the Fukushima Daiichi nuclear power plant in Japan, the migration of radioactive cesium (Cs) in soils has become a crucial issue since this can negatively affect human health and the surrounding environment. Dissolved organic matter (DOM) may have different influences on Cs migration in soils depending on Cs adsorption sites with different selectivity. It is unclear how DOM affects the rapid migration of Cs in soils under flowing water conditions during rainfall events. This study evaluated the effects of DOM on Cs migration in weathered granite soil depending on Cs adsorption sites by conducting laboratory experiments under different DOM conditions and Cs concentrations in the liquid phase. Cs concentration can affect the fraction of Cs adsorbed onto differently selective sites, and DOM can have different influences on Cs migration in the soil accordingly. Under condition of high-Cs concentration, the DOM adsorbed on the soil reduced Cs migration due to increasing Cs electrostatic adsorption to less selective sites in the soil. Meanwhile, under low-Cs concentration, the DOM adsorbed on the soil enhanced Cs migration because the DOM on the soil decreased the Cs adsorption to highly selective sites. Furthermore, DOM in the liquid phase detached the Cs adsorbed on the less selective sites and enhanced Cs migration in the soil, regardless of the Cs concentration.
    Keywords Japan ; accidents ; adsorption ; cesium radioisotopes ; dissolved organic matter ; environmental management ; granite soils ; human health ; liquids ; migratory behavior ; nuclear power ; power plants ; rain
    Language English
    Dates of publication 2022-0315
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2021.114409
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  2. Article ; Online: Vertical migration of cesium in weathered granite soil under flowing water condition depending on Cs concentration and states of dissolved organic matter.

    Tatsuno, Takahiro / Hamamoto, Shoichiro / Nihei, Naoto / Nishimura, Taku

    Journal of environmental management

    2022  Volume 306, Page(s) 114409

    Abstract: After the accident at the Fukushima Daiichi nuclear power plant in Japan, the migration of radioactive cesium (Cs) in soils has become a crucial issue since this can negatively affect human health and the surrounding environment. Dissolved organic matter ...

    Abstract After the accident at the Fukushima Daiichi nuclear power plant in Japan, the migration of radioactive cesium (Cs) in soils has become a crucial issue since this can negatively affect human health and the surrounding environment. Dissolved organic matter (DOM) may have different influences on Cs migration in soils depending on Cs adsorption sites with different selectivity. It is unclear how DOM affects the rapid migration of Cs in soils under flowing water conditions during rainfall events. This study evaluated the effects of DOM on Cs migration in weathered granite soil depending on Cs adsorption sites by conducting laboratory experiments under different DOM conditions and Cs concentrations in the liquid phase. Cs concentration can affect the fraction of Cs adsorbed onto differently selective sites, and DOM can have different influences on Cs migration in the soil accordingly. Under condition of high-Cs concentration, the DOM adsorbed on the soil reduced Cs migration due to increasing Cs electrostatic adsorption to less selective sites in the soil. Meanwhile, under low-Cs concentration, the DOM adsorbed on the soil enhanced Cs migration because the DOM on the soil decreased the Cs adsorption to highly selective sites. Furthermore, DOM in the liquid phase detached the Cs adsorbed on the less selective sites and enhanced Cs migration in the soil, regardless of the Cs concentration.
    MeSH term(s) Cesium/analysis ; Cesium Radioisotopes/analysis ; Dissolved Organic Matter ; Fukushima Nuclear Accident ; Humans ; Japan ; Radiation Monitoring ; Silicon Dioxide ; Soil ; Soil Pollutants, Radioactive/analysis ; Water
    Chemical Substances Cesium Radioisotopes ; Dissolved Organic Matter ; Soil ; Soil Pollutants, Radioactive ; granite ; Water (059QF0KO0R) ; Cesium (1KSV9V4Y4I) ; Silicon Dioxide (7631-86-9)
    Language English
    Publishing date 2022-01-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2021.114409
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Inhibited nanobubble transport in a saturated porous medium: Effects of deposited colloidal particles

    Sugimoto, Takuya / Hamamoto, Shoichiro / Nishimura, Taku

    Journal of contaminant hydrology. 2021 Oct., v. 242

    2021  

    Abstract: Nanobubbles have recently attracted much interest for their practical use and potential applications in environmental issues. The pre-existence of deposited colloidal particles in porous media commonly occurs when nanobubbles applied to porous media ... ...

    Abstract Nanobubbles have recently attracted much interest for their practical use and potential applications in environmental issues. The pre-existence of deposited colloidal particles in porous media commonly occurs when nanobubbles applied to porous media interact with deposited colloidal particles. However, the current understanding of the effect of the interactions with pre-deposited colloidal particles on nanobubble transport in saturated porous media remains incomplete, and the effects are often overlooked. Therefore, we performed 1D column experiments with sequential injections of colloidal and nanobubble suspensions to study the effect of pre-deposited materials on the retention and release of colloids and nanobubbles in packed glass beads. In this study, we used resonant mass measurements to measure the number concentrations of colloids and nanobubbles during transport experiments for the first time to distinguish between coexisting solid colloidal particles and nanobubbles with different buoyancies in mixed effluent during transport. The nanobubble retention increased because of the pre-existence of deposited colloidal particles, indicating that the deposited colloidal particles act as additional deposition sites and physical obstacles for nanobubbles through physicochemical (including hydrophobic) interactions. This study also provides a future reference for the applicability of resonant mass measurement to cotransport experiments of different buoyant particles, including colloids, nanobubbles, and oil droplets.
    Keywords glass ; hydrology ; hydrophobicity ; nanobubbles ; oils ; porous media
    Language English
    Dates of publication 2021-10
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1494766-3
    ISSN 1873-6009 ; 0169-7722
    ISSN (online) 1873-6009
    ISSN 0169-7722
    DOI 10.1016/j.jconhyd.2021.103854
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  4. Article ; Online: Inhibited nanobubble transport in a saturated porous medium: Effects of deposited colloidal particles.

    Sugimoto, Takuya / Hamamoto, Shoichiro / Nishimura, Taku

    Journal of contaminant hydrology

    2021  Volume 242, Page(s) 103854

    Abstract: Nanobubbles have recently attracted much interest for their practical use and potential applications in environmental issues. The pre-existence of deposited colloidal particles in porous media commonly occurs when nanobubbles applied to porous media ... ...

    Abstract Nanobubbles have recently attracted much interest for their practical use and potential applications in environmental issues. The pre-existence of deposited colloidal particles in porous media commonly occurs when nanobubbles applied to porous media interact with deposited colloidal particles. However, the current understanding of the effect of the interactions with pre-deposited colloidal particles on nanobubble transport in saturated porous media remains incomplete, and the effects are often overlooked. Therefore, we performed 1D column experiments with sequential injections of colloidal and nanobubble suspensions to study the effect of pre-deposited materials on the retention and release of colloids and nanobubbles in packed glass beads. In this study, we used resonant mass measurements to measure the number concentrations of colloids and nanobubbles during transport experiments for the first time to distinguish between coexisting solid colloidal particles and nanobubbles with different buoyancies in mixed effluent during transport. The nanobubble retention increased because of the pre-existence of deposited colloidal particles, indicating that the deposited colloidal particles act as additional deposition sites and physical obstacles for nanobubbles through physicochemical (including hydrophobic) interactions. This study also provides a future reference for the applicability of resonant mass measurement to cotransport experiments of different buoyant particles, including colloids, nanobubbles, and oil droplets.
    MeSH term(s) Colloids ; Porosity
    Chemical Substances Colloids
    Language English
    Publishing date 2021-06-29
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1494766-3
    ISSN 1873-6009 ; 0169-7722
    ISSN (online) 1873-6009
    ISSN 0169-7722
    DOI 10.1016/j.jconhyd.2021.103854
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Water‐ and air‐filled pore networks and transport parameters under drying and wetting processes

    Hamamoto, Shoichiro / Ohko, Yushi / Ohtake, Yutaka / Moldrup, Per / Nishimura, Taku

    Vadose zone journal. 2022 July, v. 21, no. 4

    2022  

    Abstract: The connectivity and tortuosity of fluid‐filled pore networks in the water and air phases strongly influence the mass transport in porous media. Moisture conditions (water content and distribution) alter water‐ or air‐filled pore networks. In this study, ...

    Abstract The connectivity and tortuosity of fluid‐filled pore networks in the water and air phases strongly influence the mass transport in porous media. Moisture conditions (water content and distribution) alter water‐ or air‐filled pore networks. In this study, using a sand column with variable saturated conditions, water‐ and air‐filled pore networks were analyzed using X‐ray computed tomography (CT). Water and air transport parameters, including hydraulic conductivity, gas diffusion coefficient, and air permeability, were measured. The objectives were (a) to identify the effects of entrapped air on the water‐filled pore network and hydraulic conductivity and (b) to understand the water‐ and air‐filled pore networks and relevant transport parameters in the sand column during the drying and wetting processes. Measurements of hydraulic conductivity using quasisaturated samples showed that hydraulic conductivity was drastically reduced when smaller in situ air bubbles were present inside the sand column. At the same air‐filled porosity, higher gas diffusivity and air permeability were obtained under wetting than those during drying. X‐ray CT image analysis revealed that the air‐filled pore network connectivity during wetting was higher than that during drying, resulting in enhanced gas transport parameters during the wetting process. The observed differences in water‐ and air‐filled pore networks during drying and wetting processes are highly promising for future multiphase mass transport models in soils.
    Keywords X-radiation ; air ; air transportation ; computed tomography ; diffusivity ; hydraulic conductivity ; image analysis ; mass transfer ; permeability ; porosity ; sand ; vadose zone ; water content
    Language English
    Dates of publication 2022-07
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2088189-7
    ISSN 1539-1663
    ISSN 1539-1663
    DOI 10.1002/vzj2.20205
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  6. Article: Effects of the dissolved organic matter on Cs transport in the weathered granite soil

    Tatsuno, Takahiro / Hamamoto, Shoichiro / Nihei, Naoto / Nishimura, Taku

    Journal of environmental management. 2020 Jan. 15, v. 254

    2020  

    Abstract: It is important to understand the migration of Cesium (Cs) in soils, particularly after the nuclear power plant accident at Fukushima Dai-ichi, Japan. Dissolved organic matter (DOM) is one of factors affecting the migration of Cs in soils under flowing ... ...

    Abstract It is important to understand the migration of Cesium (Cs) in soils, particularly after the nuclear power plant accident at Fukushima Dai-ichi, Japan. Dissolved organic matter (DOM) is one of factors affecting the migration of Cs in soils under flowing water conditions. We investigated the effect of DOM on the migration of Cs adsorbed to the clay planar site via laboratory column experiments. The sequence of DOM application had a significant influence on Cs transport in the soil. When DOM was applied concurrently with or prior to Cs application, the DOM adsorbed on to the clay planar site adsorbed onto the soil solid surface and enhanced Cs adsorption; consequently, it slowed Cs migration in the soil. In particular, in the case of DOM loaded prior to the application of Cs solution, a noticeable delay in Cs migration was observed. On the other hand, when DOM was applied to the soil where the Cs solution had been previously applied, the DOM desorbed Cs from the soil. DOM in liquid phase enhanced the migration of Cs through the formation of binding to organic matter. Majority of Cs affected by DOM was the exchangeable fraction that adsorbed to the clay planar site. In other words, DOM attached to the soil would adsorb Cs as a easily exchangeable form and depress migration of Cs. On the other hand, DOM in the soil solution may up take adsorbed Cs from the soil and enhanced the transport in the form of Cs bound to DOM.
    Keywords accidents ; adsorption ; cesium ; clay ; dissolved organic matter ; granite soils ; nuclear power ; power plants ; soil solution ; Japan
    Language English
    Dates of publication 2020-0115
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2019.109785
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  7. Article ; Online: Pore connectivity influences mass transport in natural rocks: Pore structure, gas diffusion and batch sorption studies

    Yuan, Xiaoqing / Hu, Qinhong / Lin, Xiang / Zhao, Chen / Wang, Qiming / Tachi, Yukio / Fukatsu, Yuta / Hamamoto, Shoichiro / Siitari-Kauppi, Marja / Li, Xiaodong

    Journal of Hydrology. 2023 Mar., v. 618 p.129172-

    2023  

    Abstract: Six rocks (one granodiorite, one limestone, two chalks, one mudstone, and one dolostone) with different extents of heterogeneity at six different particle sizes (from 75 to 8000 μm) were studied to describe the effects of pore connectivity on mass ... ...

    Abstract Six rocks (one granodiorite, one limestone, two chalks, one mudstone, and one dolostone) with different extents of heterogeneity at six different particle sizes (from 75 to 8000 μm) were studied to describe the effects of pore connectivity on mass transport. The methods applied were (i) porosity measurement of granular rocks, (ii) analyses of gas-phase diffusive transport in a bed of packed particles, along with a solid quartz method at these six particle sizes being developed to identify the contribution of intraparticle diffusion, and (iii) batch sorption tests of multiple ions (anions and cations) with subsequent analyses of inductively coupled plasma-mass spectrometry. Granular porosity measurement results reveal that with decreasing particle sizes, the effective porosities for the “heterogenous” group of rocks (Grimsel granodiorite and Edwards limestone) increase, whereas the porosities of another “homogeneous” group (two Israel chalk samples, Japan mudstone, and Wyoming dolostone) remain constant. Gas diffusion results show that the intraparticle gas diffusion coefficient among these two sample groups, varying in the magnitude of 10⁻⁸ to 10⁻⁶ m²/s, are not directly correlated to the porosity differences. Moreover, the batch sorption work displays a different affinity of rocks for various tracers. For Grimsel granodiorite, Japan mudstone, and Wyoming dolostone, the adsorption capacity of Sm³⁺ and Eu³⁺ increases as the particle size decreases. In general, this integrated research of grain size distribution, granular rock porosity, intraparticle diffusivity, and ionic sorption capacity gives insights into the pore connectivity effect on both physical and chemical transport behaviors for different lithologies and/or different particle sizes.
    Keywords Japan ; adsorption ; chalk ; diffusivity ; dolomitic limestone ; granodiorite ; hydrology ; lithology ; mass transfer ; mudstone ; particle size ; particle size distribution ; porosity ; quartz ; spectroscopy ; Israel ; Wyoming ; Rock lithologies ; Pore connectivity ; Heterogeneity ; Sample size-dependent effective porosity ; Intraparticle diffusivity ; Batch sorption
    Language English
    Dates of publication 2023-03
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 1473173-3
    ISSN 1879-2707 ; 0022-1694
    ISSN (online) 1879-2707
    ISSN 0022-1694
    DOI 10.1016/j.jhydrol.2023.129172
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  8. Article ; Online: Potassium buffering characteristics and detection of soils with challenges in evaluating radiocesium uptake risk of crops by exchangeable potassium

    Eguchi, Tetsuya / Yamada, Daigo / Hirayama, Takashi / Kohata, Kazuhiro / Kanno, Noboru / Nihei, Naoto / Hamamoto, Shoichiro / Kubo, Katashi / Saito, Takashi / Shinano, Takuro

    Archives of Agronomy and Soil Science. 2023 Nov. 10, v. 69, no. 13 p.2703-2720

    2023  

    Abstract: In surrounding areas influenced by the Fukushima Dai-ichi Nuclear Power Plant accident, the radiocesium uptake by crops was evaluated based on soil exchangeable K. As risk evaluation does not function effectively in several fields, K buffering was ... ...

    Abstract In surrounding areas influenced by the Fukushima Dai-ichi Nuclear Power Plant accident, the radiocesium uptake by crops was evaluated based on soil exchangeable K. As risk evaluation does not function effectively in several fields, K buffering was characterized using quantity/intensity (Q/I) relationship analysis to evaluate the availability of exchangeable K. The results of the analysis clearly explain the difficulty in the risk evaluation: i) difficulty in increasing exchangeable K, owing to retention as non-exchangeable K by vermiculite; ii) difficulty in retaining exchangeable K due to low K buffering capacity, reflecting the lack of K-selective clay minerals; and iii) difficulty in increasing soil solution K intensity due to high K buffering capacity, reflecting the abundance of K-selective clay minerals. Among the parameters calculated from the Q/I relationship analysis, β values, corresponding to the retention rate of loaded K to the soil, for total K (βt), exchangeable K (βe), and non-exchangeable K (βn) would be useful as simple indicators of soils with a predicament in the risk evaluation of radiocesium uptake by crops through exchangeable K. These soils showed distinctively low βt values (0.18 or lower), high βe value (0.37 or higher), or high βn/βt ratio (0.53 or higher).
    Keywords accidents ; agronomy ; clay ; exchangeable potassium ; nuclear power ; potassium ; power plants ; risk ; risk assessment ; soil ; soil solution ; vermiculite ; Potassium fixation ; quantity/intensity relationship analysis ; radiocesium ; zeolite ; 2:1 type clay mineral
    Language English
    Dates of publication 2023-1110
    Size p. 2703-2720.
    Publishing place Taylor & Francis
    Document type Article ; Online
    ZDB-ID 1132910-5
    ISSN 1476-3567 ; 0365-0340
    ISSN (online) 1476-3567
    ISSN 0365-0340
    DOI 10.1080/03650340.2023.2172166
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  9. Article ; Online: Effects of the dissolved organic matter on Cs transport in the weathered granite soil.

    Tatsuno, Takahiro / Hamamoto, Shoichiro / Nihei, Naoto / Nishimura, Taku

    Journal of environmental management

    2019  Volume 254, Page(s) 109785

    Abstract: It is important to understand the migration of Cesium (Cs) in soils, particularly after the nuclear power plant accident at Fukushima Dai-ichi, Japan. Dissolved organic matter (DOM) is one of factors affecting the migration of Cs in soils under flowing ... ...

    Abstract It is important to understand the migration of Cesium (Cs) in soils, particularly after the nuclear power plant accident at Fukushima Dai-ichi, Japan. Dissolved organic matter (DOM) is one of factors affecting the migration of Cs in soils under flowing water conditions. We investigated the effect of DOM on the migration of Cs adsorbed to the clay planar site via laboratory column experiments. The sequence of DOM application had a significant influence on Cs transport in the soil. When DOM was applied concurrently with or prior to Cs application, the DOM adsorbed on to the clay planar site adsorbed onto the soil solid surface and enhanced Cs adsorption; consequently, it slowed Cs migration in the soil. In particular, in the case of DOM loaded prior to the application of Cs solution, a noticeable delay in Cs migration was observed. On the other hand, when DOM was applied to the soil where the Cs solution had been previously applied, the DOM desorbed Cs from the soil. DOM in liquid phase enhanced the migration of Cs through the formation of binding to organic matter. Majority of Cs affected by DOM was the exchangeable fraction that adsorbed to the clay planar site. In other words, DOM attached to the soil would adsorb Cs as a easily exchangeable form and depress migration of Cs. On the other hand, DOM in the soil solution may up take adsorbed Cs from the soil and enhanced the transport in the form of Cs bound to DOM.
    MeSH term(s) Cesium ; Cesium Radioisotopes ; Fukushima Nuclear Accident ; Japan ; Radiation Monitoring ; Silicon Dioxide ; Soil ; Soil Pollutants, Radioactive
    Chemical Substances Cesium Radioisotopes ; Soil ; Soil Pollutants, Radioactive ; granite ; Cesium (1KSV9V4Y4I) ; Silicon Dioxide (7631-86-9)
    Language English
    Publishing date 2019-11-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2019.109785
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  10. Article ; Online: Enhancement of developmentally regulated daidzein secretion from soybean roots in field conditions as compared with hydroponic culture.

    Toyofuku, Miwako / Okutani, Fuki / Nakayasu, Masaru / Hamamoto, Shoichiro / Takase, Hisabumi / Yazaki, Kazufumi / Sugiyama, Akifumi

    Bioscience, biotechnology, and biochemistry

    2021  Volume 85, Issue 5, Page(s) 1165–1169

    Abstract: Analyses of metabolite secretions by field-grown plants remain scarce. We analyzed daidzein secretion by field-grown soybean. Daidzein secretion was higher during early vegetative stages than reproductive stages, a trend that was also seen for ... ...

    Abstract Analyses of metabolite secretions by field-grown plants remain scarce. We analyzed daidzein secretion by field-grown soybean. Daidzein secretion was higher during early vegetative stages than reproductive stages, a trend that was also seen for hydroponically grown soybean. Daidzein secretion was up to 10 000-fold higher under field conditions than hydroponic conditions, leading to a more accurate simulation of rhizosphere daidzein content.
    MeSH term(s) Genistein/isolation & purification ; Genistein/metabolism ; Glucosides/biosynthesis ; Glucosides/isolation & purification ; Hydroponics/methods ; Isoflavones/biosynthesis ; Isoflavones/isolation & purification ; Organ Specificity ; Plant Leaves/growth & development ; Plant Leaves/metabolism ; Plant Roots/growth & development ; Plant Roots/metabolism ; Rhizosphere ; Glycine max/growth & development ; Glycine max/metabolism
    Chemical Substances Glucosides ; Isoflavones ; genistin (1POG3SCN5T) ; malonylgenistin (2AUB85VT2K) ; daidzin (4R2X91A5M5) ; 6''-O-malonyldaidzin (54CE6OWE7A) ; daidzein (6287WC5J2L) ; Genistein (DH2M523P0H)
    Language English
    Publishing date 2021-03-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 1106450-x
    ISSN 1347-6947 ; 0916-8451
    ISSN (online) 1347-6947
    ISSN 0916-8451
    DOI 10.1093/bbb/zbab017
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