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902 results on '"Akagi, H."'

24. Genomic distribution of MITEs in barley determined by MITE-AFLP mapping

Author

Takahashi, H., Akagi, H., Mori, K., Sato, K., and Takeda, K.

Subjects
Barley -- Genetic aspects, Barley -- Research, Plant genetics -- Research, Chromosome mapping -- Research, Biological sciences
Abstract

Abstract: Miniature inverted-repeat transposable elements (MITEs) represent a large superfamily of transposons that are moderately to highly repetitive and frequently found near or within plant genes. To elucidate the organization [...]

Published
2006

25. Environmental assessment of mercury dispersion, transformation and bioavailability in the Lake Victoria Goldfields, Tanzania

Author

Ikingura, J.R., Akagi, H., Mujumba, J., and Messo, C.

Subjects
Gold mines and mining -- Environmental aspects, Mercury -- Properties, Mercury -- Distribution, Bioavailability -- Research, Dispersion measures (Statistics) -- Research, Mercury -- Health aspects, Mercury -- Research, Company distribution practices, Environmental issues
Abstract

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jenvman.2005.09.026 Byline: J.R. Ikingura (a), H. Akagi (b), J. Mujumba (a), C. Messo (a) Keywords: Mercury; Bioavailability; Lake Victoria; Gold mining Abstract: Environmental dispersion and transformation of mercury discharged from gold mining operations has been investigated in field and laboratory studies in order to provide better understanding of the degree of mercury (Hg) pollution and bioavailability in the Lake Victoria goldfields (LVGF) ecosystems. This paper reviews results already published elsewhere and presents additional data on Hg dynamics in the LVGF. Studies conducted at the Mugusu and Rwamagaza artisanal mines indicated different degrees of Hg contamination and dispersion in environmental matrices. Mercury concentration in contaminated river sediments near the Mugusu mine varied from 6.0 to 0.5mg/kg on a dry weight basis. The highest Hg contamination levels (165-232mg/kg) were associated with mine tailings at the Rwamagaza mine. Mercury concentrations in fish representing different dietary habits on the southwestern shore of Lake Victoria at the Nungwe Bay were very low (2-35[mu]g/kg) and thought to represent background levels. These and other results suggested that the use of Hg in gold extraction in the LVGF has not caused high Hg levels in lake fish. The study of Hg in lichens showed Parmelia lichen to be an effective bioindicator for atmospheric Hg contamination due to Hg emissions from gold-amalgam firing and purification operations. The Hg levels in the lichens around the Mugusu mine ranged from 3.1 to 0.1[mu]g/g; the highest levels were recorded in the lichens sampled close to gold-amalgam processing sites. The regional background level in the Parmelia lichen was 0.05-0.10[mu]g/g, with a mean level of 0.07[mu]g/g. Studies of Hg transformation in the mine tailings revealed unexpectedly high methylmercury (MeHg) levels in the tailings (629-710ng/g), which indicated that oxidation and methylation of metallic Hg in the tailings occurred at significant levels under tropical conditions. Re-equilibration of the tailings with freshwater (FW) indicated the MeHg was firmly bound in the tailings and therefore very little MeHg was released to the water column (0.2-1.5ng/L). The methylation of Hg in tropical loamy clay soil contaminated with HgCl.sub.2 (5mgHg/kg) yielded MeHg concentrations of 11 and 14ng/g when inundated with seawater and FW, respectively, for 4 weeks. Little MeHg was transferred from the soil to the equilibrated water (a[c]1/20.4ng/L). Atmospheric exposure of the soil pre-inundated with FW resulted in net degradation of MeHg during the 1st week of exposure, followed by net production and accumulation of MeHg in the soil (up to 15.5ng/g) during atmospheric desiccation. Mercury uptake by fish from the Hg.sup.0-contaminated aquatic sediment-tailings system in the aquarium experiment was found to be low, suggesting the low availability of MeHg for bioaccumulation in the system. These and other results provide useful insights into Hg transformation, mobility and bioavailability in tropical aquatic systems affected by Hg pollution from gold mining operations. Author Affiliation: (a) University of Dar es Salaam, P.O. Box 35052 Dar es Salaam, Tanzania (b) National Institute for Minamata Disease, Minamata City, Kumamoto, Japan Article History: Received 26 December 2004; Revised 24 February 2005; Accepted 30 September 2005

Published
2006

38. Numerical study on load-settlement relationships of shallow foundation under extremely low confining pressure

Author

Akagi, H., Sato, K., and Kiriyama, T.

Subjects
Finite element method, Computational methods in mechanics, Particle methods (Numerical analysis), Elements finits, Mètode dels, Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC], Material Point Method, Shallow Foundation, Large Deformation
Abstract

In order to investigate the ground behavior under shallow foundation with extremely low confining pressure, numerical analysis has been performed using the Material Point Method. Material Point Method is one of particle-based methods but it still uses numerical grid. It has been applied to many problems of geomaterial since it was proposed for the first time. The authors focus on the robustness of the method under large deformation problem and applied it to the shallow foundation problem of geomaterial. In this paper, the formulation and implementation of Material Point Method are described, followed by verification and validation for the implemented code. Then, the parametric investigations on ground behavior under shallow foundation have been carried out.

Published
2019

39. Large deformation analysis of ground with wall movement or hallow foundation under extremely low confining pressure using PIV

Author

Sato, K., Akagi, H., Kiriyama, T., and Esaki, K.

Subjects
Finite element method, Computational methods in mechanics, Particle methods (Numerical analysis), Elements finits, Mètode dels, Particl Image Velocimetry (PIV), laminated aluminum bars, wall movement, shallow foundation, Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC]
Abstract

Large-scale natural disasters have occurred frequently in recent years. In such disasters, large ground deformation has been a recurring phenomenon. As it directly affects the structure, has dureable design is necessitated to minimize the damages. Additionally, the fracture process zones are predicted using numerical analysis, and thereafter, the results of the analysis are validated after comparison with the experimental ones. In this study, image analysis is performed using particle image velocimetry (PIV), and subsequently, the analysis results are validated by the comparison. We herein aim to improve the precision of the image-analysis results, and examine the experimental or analytical condition of reproducing the deformation .

Published
2019

45. Structural diversity and evolution of the Rf-1 locus in the genus Oryza

Author

Kato, H., Tezuka, K., Feng, Y.Y., Kawamoto, T., Takahashi, H., Mori, K., and Akagi, H.

Subjects
Cytoplasmic male sterility -- Research, Evolution -- Research, Rice -- Genetic aspects, Biological sciences
Abstract

The genomic structure of the Rf-1 locus in the genus Oryza (rice) is analyzed to clarify its structural diversity and evolution. It is suggested that the ancestor of the Rf-1 gene may have duplicated early in rice evolution, and subsequent recombination may have resulted in the present diversified structure of the Rf-1 locus.

Published
2007

50. Abstracts

Author

Abdullah, Lubna H., Buchanan, K. D., Akopyan, T. N., Arzumanyan, A. M., Arutunyan, A. A., Berger, H., Oehme, P., Atkinson, M. E., Chaggar, J. S., Bailey, S. J., Featherstone, R. L., Jordan, C. C., Morton, I. K. M., Balfe, A., Skrabanek, P., Powell, D., Barja, F., Mathison, R., Huggel, H., Bittiger, H., Heid, J., Björkroth, Ulla, Rosell, Sune, Boyd, N. D., Anthony, M. P., Leeman, S. E., Briggs, I., Growcott, J. W., Jamieson, A., Tarpey, Ann V., Brodin, E., Meyerson, B. A., Brown, J. R., Hayes, A. G., Meecham, K. G., Tyers, M. B., Burcher, E., Bynke, G., Håkanson, R., Hörig, J., Cann, John R., Rahim, Iffat, Vatter, Albert, Stewart, John M., Cascieri, Margaret A., Liang, Tehming, Cheeseman, H. J., Pinnock, R. O., Henderson, G., Constantinidis, J., Bouras, C., Taban, C. H., Guntern, R., Couture, R., Cuello, A. C., Dalsgaard, C. -J., Jonsson, C. -E., Arvidsson, J., Risling, M., Hökfelt, T., Schultzberg, M., Vincent, S. R., Elfvin, L. -G., de Beaurepaire, R., Iversen, S. D., Delbro, D., Lisander, B., Fändriks, L., Andersson, S. A., Del Fiacco, M., Dessi, M. L., Levarvti, M. C., Del Rio, J., Naranjo, J. R., Domschke, S., Bloom, S. R., Adrian, T. E., Lux, G., Bryant, M. G., McGregor, G. P., Domschke, W., Donnerer, J., Barthó, L., Holzer, P., Lembeck, F., Skofitsch, G., Elliott, P. J., Bannon, M. J., Alpert, J. E., Ferri, G. -L, McGregor, G., Vezzadini, P., Labo, G., Polak, J. M., Fontaine-Perus, J. C., Chanconie, M., Foreman, J. C., Piotrowski, W., Fox, J. E. T., Daniel, E. E., Jury, J., Domoto, T., Berezin, I., Gaudino, G., Mondardini, L., Fasolo, A., Gazelius, B., Kahan, T., Panopoulos, P., Olgart, L., Gintzler, Alan R., Jaffe, Bernard M., Baron, Sheri A., GrÖnstad, K. O., Ahlman, H., Zinner, M. J., Jaffe, B. M., Yeo, C., Gu, J., Huang, W. M., lslam, K. N., Terenghi, G., Morrison, J., Güllner, H. -G., Haeusler, Guenther, Handelmann, Gail E., Selsky, Joyce H., Helme, R. D., White, D. M., Höfler, H., Heitzt, Ph. U., Auböck, L., Petsche, Ulrike, Lippe, Irmgard, Hylden, Janice L. K., Wilcox, George L., Inoue, Atsuko, Nakata, Yoshihiro, Segawa, Tomio, Jakubowska-Naziemblo, B., Potargowicz, E., Traczyk, W. Z., Cannon, D., Rohde, W., JancsÓ, G., Király, E., Karcsú, S., Szebeni, A., Bácsy, E., Jones, R. S. G., Olpe, H. -R., Wrightt, D. M., Jurna, I., Kerdelhué, B., Lenoir, V., Pasqualini, C., El Abed, A., Morel, G., Dubois, P., Hublot, P., Tartar, A., Klingmúller, D., Waltz, C., Kramer, H. J., Koop, H., Luster, W., Gropp, C., Havemenn, K., Arnold, R., Krause, James E., McKelvy, Jeffrey F., Krivoy, W., Couch, J., Strand, F., Leander, S., Folkers, K., Lee, C. M., Snyder, S. H., Lindberg, P., Dahlström, A., Lundberg, J. M., Lindefors, N., Ungerstedt, U., Liu-Chen, L. -Y., Liszczak, T., Mayberg, M. R., Moskowitz, M. A., Lundberg, Jan M., Saria, Alois, Brodin, Ernst, Martling, Claes-Roland, Hökfelt, Tomas, Lundblad, Lars, Änggård, Anders, McGeeney, K. F., O'Donnell, M. D., Blank, M. A., Manolas, K., Linger, W. G., Allen, J. M., Maggio, J. E., Sandberg, B. E. B., Bradley, C. V., Iversen, L. L., Santikarn, S., Williams, D. H., Hunter, J. C., Hanley, M. R., Magnusson, I., Thulin, L., Mandahl, Agneta, Bill, Anders, Manning, Maurice, Martensson, H., Akande, B., Stofer, P., Chappuis, G., Immer, H., Groog, P., Matthews, Margaret R., Connaughton, M., Moratalla, R., Nobin, Anders, Emson, Piers, Sundler, Frank, O'Donohue, T. L., Shults, C. W., Quirion, R., Moody, T. W., Chase, T. N., Otsuka, M., Konishi, S., Yanagisawa, M., Akagi, H., Otten, U., Rüegg, U. T., Pawlik, W., Konturek, S. J., Kania, J., Gustaw, P., Cosgrove, Patricia G., Pazoles, Christopher J., Priestley, J. V., Jensen, R. T., Pert, C. B., Regoli, D., Mizrahi, J., D'Orléans-Juste, P., Caranikas, S., Escher, E., Folkers, Karl, Rüegg, Urs T., Bishai, W. R., Saria, A., Rama Sastry, B. V., Jaiswal, Neelam, Tayeb, Osama S., Schultheiss, Hartmut, Hörig, Joachim, Scott, T. M., Shanahan, F., Befus, A. D., Fox, J., Denburg, J. A., Bienenstock, J., Sheppard, M. N., Kurian, S. S., Siegel, R. A., Weidenfeld, J., Globus, M., Melamed, E., Sjödin, L., Srivastava, G., Hall, Michael E., Suhar, A., Turk, V., Marks, N., Szkudlarek, U., Tarkkanen, A., Tervo, T., Tervo, K., Eränkö, L., Eränkö, O., Huang, W. -M., Morrison, J. F. B., Unger, W. G., Tessler, A., Himes, B. T., Murray, M., Goldberger, M. E., Torrens, Y., Beaujouan, J. C., Viger, A., Glowinski, J., Casanueva, F. F., Knuth, E., Havlicek, V., Friesen, H. G., Triepel, J., Weindl, A., Reinecke, M., Mader, J., Forssmann, W. G., Unger, Thomas, Becker, Hans, König, Manfred, Ganten, Detlev, Lang, Rudolf E., Vacca, L. L., Naftchi, N. E., Guan, X. -M., Ai, M. -K., Vijayan, E., Wang, Y. M., Mashford, M. L., Watson, Stephen P., Sandberg, Bengt E. B., Iversen, Leslie L., Weihe, E., Hartschuh, W., Kuchling, G., Winter, E. A., Keen, P., Yeo, C. J., Ylikoski, Jukka, Tervo, Timo, Tervo, Kaarina, Eränko, Liisa, and Cuello, Claudio

Published
1983
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