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  • 2020-2024  (22)
  • 1965-1969  (56)
  • 1955-1959  (15)
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  • 1
    Online Resource
    Online Resource
    Singapore :Springer Nature Singapore :
    Keywords: Cytology. ; Biomathematics. ; Biophysics. ; Cell Biology. ; Mathematical and Computational Biology. ; Biophysics.
    Description / Table of Contents: Chapter 1. Introduction -- Chapter 2.Cell center model -- Chapter 3.Applications of the cell center model -- Chapter 4. Vertex mode -- Chapter 5.Applications of the cell models to 2D cell patterns -- Chapter 6.3D vertex model -- Chapter 7.The world of epithelial sheets[7·1] -- Chapter 8.Cells themselves produce force for active remodeling -- Chapter 9.Expansion of shape-dimension -- Chapter 10.Mathematical cell models and morphogenesis.
    Abstract: This book describes the shape formation of living organisms using mathematical models. Genes are deeply related to the shape of living organisms, and elucidation of a pathway of shape formation from genes is one of the fundamental problems in biology. Mathematical cell models are indispensable tools to elucidate this problem. The book introduces two mathematical cell models, the cell center model and the vertex model, with their applications. The cell center model is applied to elucidate the formation of neat cell arrangements in epidermis, cell patterns consisting of heterogeneous-sized cells, capillary networks, and the branching patterns of blood vessels. The vertex model is applied to elucidate the wound healing mechanisms of the epithelium and ordered pattern formation involving apoptosis. Pattern formation with differential cell adhesion is also described. The vertex model is then extended from a two-dimensional (2D) to a three-dimensional (3D) model. A cell aggregate involving a large cavity is described to explain the development of the mammalian blastocyst or the formation of an epithelial vesicle. Epithelial tissues and the polarity formation process of the epithelium are also explained. The vertex model also recapitulates active remodeling of tissues and describes the twisting of tissue that contributes to understanding the cardiac loop formation of the embryonic tube. The book showcases that mathematical cell models are indispensable tools to understand the shape formation of living organisms. Successful contribution of the mathematical cell models means that the remodeling of collective cells is self-construction. Examining the successive iterations of self-constructions leads to understanding the remarkable and mysterious morphogenesis that occurs during the development of living organisms. The intended readers of this book are not only theoretical or mathematical biologists, but also experimental and general biologists, including undergraduate and postgraduate students who are interested in the relationship between genes and morphogenesis. .
    Type of Medium: Online Resource
    Pages: VIII, 192 p. 1 illus. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9789811929168
    Series Statement: Theoretical Biology,
    DDC: 571.6
    Language: English
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  • 2
    Publication Date: 2024-04-20
    Description: Data files S1-S13. Microfocus X-ray Computed Tomography cross-sectional images of 13 selected radiolarian skeletons in the western Arctic Ocean. The CT-scanned 3D images can be visualized by 3D image viewer Molcer Plus (http://www.white-rabbit.jp/molcerPlusE.html). Data file S1. Microfocus X-ray Computed Tomography cross-sectional images of Actinomma boreale Data file S2. Microfocus X-ray Computed Tomography cross-sectional images of Actinomma leptodermum leptodermum Data file S3. Microfocus X-ray Computed Tomography cross-sectional images of Actinommidae spp. juvenile form Data file S4. Microfocus X-ray Computed Tomography cross-sectional images of Amphimelissa setosa adult form Data file S5. Microfocus X-ray Computed Tomography cross-sectional images of Amphimelissa setosa juvenile form Data file S6. Microfocus X-ray Computed Tomography cross-sectional images of Joergensenium arcticum adult form Data file S7. Microfocus X-ray Computed Tomography cross-sectional images of Joergensenium arcticum juvenile form Data file S8. Microfocus X-ray Computed Tomography cross-sectional images of Nassellarida indet. Data file S9. Microfocus X-ray Computed Tomography cross-sectional images of Phormacantha hystrix Data file S10. Microfocus X-ray Computed Tomography cross-sectional images of Pseudodictyophimus clevei Data file S11. Microfocus X-ray Computed Tomography cross-sectional images of Pseudodictyophimus gracilipes gracilipes Data file S12. Microfocus X-ray Computed Tomography cross-sectional images of Pseudodictyophimus spp. juvenile form Data file S13. Microfocus X-ray Computed Tomography cross-sectional images of Spongotrochus glacialis
    Keywords: Arctic Ocean; Binary Object; Binary Object (File Size); Binary Object (Media Type); biogenic silica; biogeochemical cycles; File content; Microfocus X-ray CT; protists; Radiolaria; Rhizaria; silica cycle
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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  • 3
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    Springer Nature | Palgrave Macmillan
    Publication Date: 2022-02-15
    Description: This open access book examines why Japan discontinued its quarter-century history of troop contribution to UN Peacekeeping Operations (1992–2017). Japan had deployed its troops as UN peacekeepers since 1992, albeit under a constitutional limit on weapons use. Japan’s peacekeepers began to focus on engineering work as its strength, while also trying to relax the constraints on weapons use, although to a minimal extent. In 2017, however, Japan suddenly withdrew its engineering corps from South Sudan, and has contributed no troops since then. Why? The book argues that Japan could not match the increasing “robustness” of recent peacekeeping operations and has begun to seek a new direction, such as capacity-building support.
    Keywords: Open Access ; Japanese studies ; peacekeeping ; peacebuilding ; security policy ; United Nations ; Japanese foreign policy ; SDG 16 ; sustainable development goals ; peace operations ; Japan’s contribution to global peace ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPS International relations ; bic Book Industry Communication::J Society & social sciences::JP Politics & government ; bic Book Industry Communication::H Humanities::HB History::HBJ Regional & national history::HBJF Asian history
    Language: English
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  • 4
    Publication Date: 2024-04-05
    Description: Infectious diseases are associated with approximately 20% of global mortality, with viral diseases causing about one third of these deaths. Besides newly emerging and re-emerging viral infections will continue to pose a threat to human survival globally. In this case scientific advances have greatly been increased to defend against those pathogens. For example, rapid genomic sequencing, proteomics, epigenomics, nanotechnology, and other advanced tools are being applied to detect viruses at the point of care and to track their spread within human populations as well as to understand virus-host interaction and virus induced pathogenesis. From rapid identification of new viruses to prevention with vaccination and treatment with effective therapeutics, biomedical research has continuously provided tools to meet the constant threat of emerging viral pathogens. Despite these advances, each new disease brings unique challenges to scientists every year. So we must stay at the cutting edge of scientific discovery, working energetically to develop new tools to combat the ever-changing threats they pose. Our research topic highlights such advanced and new technology based virus research which definitely bolsters the researcher's ability to tackle emerging, re-emerging and stable viral pathogens. We are credulous that the papers including in the e-books will be beneficial to the experts in the field to understand the molecular, immunological, ecological and clinical aspects of the next generation researches for the prevention and control of infectious diseases caused by viruses.
    Keywords: QR1-502 ; Q1-390 ; virus-host interaction ; Nanobiosensor ; Technology ; Next generation ; diagnosis ; Re-emerging ; Proteomic analysis ; Virus research ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSG Microbiology (non-medical)
    Language: English
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  • 5
    Publication Date: 2023-03-11
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Conte, M., Pàmies, R., Honda, M., & Herndl, G. Editorial: the oceanic particle flux and its cycling within the deep water column. Frontiers in Earth Science, 10, (2022): 1020065, https://doi.org/10.3389/feart.2022.1020065.
    Description: The oceanic particle flux transfers energy and material from the surface through the water column to the seafloor. (See review by Conte (2019) and references therein). The particle flux fuels life below the sunlit photic zone, exerts a major control on the global cycling of carbon and particle-associated elements, and also plays a major role in long-term carbon sequestration. In this Research Topic we present a collection of articles that provide a broad overview of current research on the interlinked processes controlling the magnitude and composition of the oceanic particle flux, and its cycling and depth attenuation within the deep water column.
    Keywords: Particle flux ; Deep ocean ; Marine particles ; Ocean biogeochemistry ; Carbon cycling ; Marine chemistry
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 6
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-06-01
    Description: We propose a new scheme based on geopotential height fields to detect cutoff lows starting in the preexisting trough stage. The intensity and scale derived from the proposed scheme will allow for a better understanding of the cutoff low life cycle. These cutoff lows often accompany mesoscale disturbances, causing adverse weather-related events, such as intense torrential rainfall and/or tornadoes. The proposed scheme quantifies the geometric features of a depression from its horizontal height profile. The height slope of a line intersecting the depression bottom and the nearest tangential point (optimal slope) locally indicates the intensity and scale of an isolated depression. The strength of the proposed scheme is that, by removing a local background height slope from a geopotential height field, the cutoff low and its preexisting trough are seamlessly detected as an identical depression. The distribution maps for the detected cutoff lows and preexisting troughs are illustrated along with their intensities, sizes, and local background flows estimated from snapshot height fields. We conducted climatological comparisons of cutoff lows to determine the utility of the proposed scheme.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 7
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-08-30
    Description: Cutoff lows (COLs) are mid-latitude cyclones appear at the upper troposphere. They contain cold air mass derived from the polar region. COLs decrease stability of the lower troposphere (e.g., Hoskins et al. 1985) and often accompany severe weathers (e.g., Mohr et al. 2020), which sometimes causes great damages to mid-latitude regions, such as Japan. Besides, the approaching routes of COLs to the Japan Islands and their seasonal cycles have not been investigated with objective method. In this study, we attempt to elucidate them by utilizing depression detection scheme of Kasuga et al. (2021; K21), which can detect COLs from their early stage (pre-existing trough stage). We have implemented a tracking scheme of COLs by simply searching overlapping of area of COLs. Merge and split of COLs are also recorded to investigate variations of the generation/dissipation of COLs. Generally, COLs approach the Japan Islands from northwest advected by the subpolar jet throughout the seasons. They also approach from southeast in JJA and SON at 200 hPa passing around the North Pacific Subtropical High. These two routes were reported in different studies; we successfully track them with a consistent criterion and confirmed that they have longer durations compared to that of a geopotential minimum detection. Tracks shows different characters at 200 and 500 hPa levels as preceding studies have noted. We have found that strong class of COLs are most frequent in MAM. We are investigating climatological backgrounds of the seasonal variations of COLs and hoping to show the results in the conference.
    Language: English
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  • 8
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-08-30
    Description: The Geospatial Information Authority of Japan (GSI) has operated two space geodetic techniques, VLBI and GNSS, at the Ishioka Geodetic Observing Station (hereafter Ishioka). We regularly conduct local-tie surveys to determine the local-tie vector connecting those techniques. In 2021, we submitted the results of the surveys to the International Earth Rotation and Reference Systems Service (IERS) to contribute to the construction of the International Terrestrial Reference Frame (ITRF). In ITRF2020, Ishioka was registered as one of the IERS stations for the first time. Reference points of VLBI antennae generally cannot be measured directly and thus need to be estimated in the local-tie survey. In Ishioka, we estimate the position of the reference point of the VLBI antenna by a method called the ‘inside method’, in which targets attached to the inner wall of the azimuth cabin are used for observation. This method is applied only to the specific antenna with an observation pillar constructed in it, but this method is effective to improve efficiency of local-tie survey. We combine the results of the inside-method observation and various other observations using total stations, geodetic leveling and static GNSS, and calculate the local-tie vector with the software called pyaxis. In this report, we will compare the local-tie vector obtained from the surveys with that derived from the ITRF2020 after describing the outline of the local-tie survey technique at Ishioka.
    Language: English
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  • 9
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-06-07
    Description: Machine learning is one of the methods employed for the immediate prediction of tsunami occurrence. There have been few studies on error evaluation focusing on the arrival time of the tsunami inundation. In this study, we used machine learning to predict the tsunami arrival times for two areas and evaluated the errors. Tsunamis were calculated for several thousand cases for three different earthquake sizes using the tsunami simulator Q-Wave and assuming a Nankai Trough earthquake. Using these data, we trained a neural network to predict tsunami arrival time on the basis of the initial water level. As the amount of training data increased, the error decreased and the model with the most training data was used to predict the tsunami arrival times for two areas. The errors tended to be particularly large in coastal areas where tsunamis often reach. In some cases, the error was larger in Area B than in Area A, even though the amount of data for Area B was double that of Area A. These errors may be ascribed to variations in the arrival time of tsunamis in the training data due to topographical characteristics. For a magnitude 9.0 earthquake, the standard deviation of the tsunami arrival time in Area B is approximately 1.5 times that of Area A. Therefore, in addition to increasing the number of output variables and the accuracy of tsunami simulation, a more detailed consideration of the effect of area-specific characteristics on the error is needed in the future.
    Language: English
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  • 10
    Publication Date: 2023-06-27
    Description: Phreatic eruptions are one of the eruption styles that are difficult to forecast and occasionally cause significant damage. Understanding the mechanisms of phreatic eruption is essential for minimizing damage. Mt. Motoshirane, one of the pyroclastic cones of the Kusatsu-Shirane Volcano located in central Japan, experienced a phreatic eruption in 2018 that resulted in casualties. The eruption was abrupt with no precursory phenomena. Mt. Motoshirane has been dormant for the last 1500 years, so it has been poorly monitored and studied. Studies conducted after the eruption suggested that the migration of hydrothermal fluids triggered the eruption, but those studies lacked information on shallow subsurface structure. In this paper, we report on the three-dimensional resistivity structure around the craters of the 2018 eruption, which was estimated from the audio-frequency magnetotelluric data obtained in 2020 and 2022. The inferred resistivity structure basically has a two-layer structure composed of a high-resistivity layer corresponding to the Quaternary lavas near the surface and low resistivities corresponding to the altered Neogene lavas below. Shallow moderately high resistivity regions in the low-resistivity layer are considered fluid reservoirs that have become infiltrated as a result of the eruption. Regions around the crack associated with the eruption showed relatively high resistivity, implying that the low resistivity zone is decoupled beneath the eruption site. We will discuss how the phreatic eruption occurred based on these interpretations in the presentation.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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