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- 저자 : M.ASAMI (검색결과 3 건)
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Bromate formation and BAC removal in drinking water treatment process
M.ASAMI,T.AIZAWA,T.MORIOKA,N.HASHIMOTO,W.NISHIJIMA,A.TABATA,Y.MAGARA 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.17 No.1
AbstractOzonation of water that has been effected by seawater intrusion or bromide contamination, inevitably results in significant bromate formation. Seasonal changes in bromate formation in water containing a high concentration of bromide were investigated at an experimental ozonation plant. When operational ozone conditions were set to maintain ozone residue at a constant level, bromate formation was significantly correlated with temperature, E260, color, and ozone dose. In GAC(granular activated carbon) column experiments, the bromate removal rate apparently decreased during transition from GAC to BAC (biological activated carbon) following ozonation. Batch experiments confirmed GAC's capacity and BAC's inability to reduce bromate ions to bromide ions. Ozonation conditions must be optimized to minimize bromate and other by-products'formation while maintaining target levels of substance removal.
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Lindahl, P.,Asami, R.,Iryu, Y.,Worsfold, P.,Keith-Roach, M.,Choi, M.S. Pergamon Press ; Elsevier Science Ltd 2011 Geochimica et cosmochimica acta Vol.75 No.5
The Pu isotopes, <SUP>239</SUP>Pu and <SUP>240</SUP>Pu, were determined in annually-banded skeletons of an accurately dated (1943-1999) modern coral (Porites lobata) from Guam Island to identify historical Pu sources to the tropical Northwest Pacific Ocean. Activity concentrations of <SUP>239+240</SUP>Pu and <SUP>240</SUP>Pu/<SUP>239</SUP>Pu atom ratios were determined in the dated coral bands using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). Close-in fallout from the former US Pacific Proving Grounds (PPG) in the Marshall Islands and global fallout were identified as the two main sources. The Guam site was dominated by PPG close-in fallout in the 1950s, with an average <SUP>240</SUP>Pu/<SUP>239</SUP>Pu atom ratio of 0.315+/-0.005. In addition, a higher <SUP>240</SUP>Pu/<SUP>239</SUP>Pu atom ratio (0.456+/-0.020) was observed that could be attributed to fallout from the ''Ivy Mike'' thermonuclear detonation in 1952. The atom ratio decreased in the 1960s and 1970s due to increase in the global fallout with a low <SUP>240</SUP>Pu/<SUP>239</SUP>Pu atom ratio (∼0.18). Recent coral bands (1981-1999) are dominated by the transport of remobilised Pu, with high <SUP>240</SUP>Pu/<SUP>239</SUP>Pu atom ratios, from the Marshall Islands to Guam Island along the North Equatorial Current (NEC). This remobilised Pu was estimated to comprise 69% of the total Pu in the recent coral bands, although its contribution was variable over time.
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Accumulation of High Levels of ABA Regulates the Pleiotropic Response of the nhr1 Arabidopsis Mutant
Francisco Quiroz-Figueroa,Adrián Rodríguez-Acosta,Amed Salazar-Blas,Elizabeta Hernández-Domínguez,Maria Eugenia Campos,Nobutaka Kitahata,Tadao Asami,Rosa M. Galaz-Avalos,Gladys I. Cassab 한국식물학회 2010 Journal of Plant Biology Vol.53 No.1
Plants have evolved a variety of mechanisms for responding to environmental cues, which allows them to survive in the presence of limited resources or environmental stresses. One of the most significant growth adaptations plants have attained is tropism, a growth response that involves bending of plant organs toward or away from a stimulus. Roots exhibit hydrotropism in response to moisture gradients, which is thought to be critical in acquiring water and establishing their stand in the soil. However, the mechanism underlying hydrotropism remains unsolved. Here, we report that the no hydrotropic response (nhr1) mutant of Arabidopsis, which is impaired in hydrotropism, is tolerant to drought. The no hydrotropic response phenotype of nhr1 was repressed by AbamineSG,an inhibitor of abscisic acid (ABA) biosynthesis, indicating that ABA negatively regulates hydrotropism. Furthermore,the content of ABA was higher in nhr1 compared to those of wild type (wt). However, the higher ABA levels in nhr1plants were not due to higher transcript levels of 9-cisepoxycarotenoid dioxygenase (NCED3), since these were diminished compared to those of wt. Our results indicated that the root hydrotropic response of the nhr1 mutant is modulated by ABA and that the higher ABA levels of the mutant might confer it drought resistance.
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