Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.156.100.188.233 [Categoria DeCS]
Referências encontradas : 476 [refinar]
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[PMID]:28965024
[Au] Autor:Ohashi S; Kuroda K; Takano T; Suzuki Y; Fujiwara T; Abe H; Kagawa A; Sugiyama M; Kubojima Y; Zhang C; Yamamoto K
[Ad] Endereço:Department of Wood Properties and Processing, Forestry and Forest Products Research Institute (FFPRI), 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan; Center for Forest Restoration and Radioecology, FFPRI, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan. Electronic address: shinta.res@gmail.com.
[Ti] Título:Temporal trends in Cs concentrations in the bark, sapwood, heartwood, and whole wood of four tree species in Japanese forests from 2011 to 2016.
[So] Source:J Environ Radioact;178-179:335-342, 2017 Nov.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:To understand the changes in radiocesium ( Cs) concentrations in stem woods after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident, we investigated Cs concentrations in the bark, sapwood, heartwood, and whole wood of four major tree species at multiple sites with different levels of radiocesium deposition from the FDNPP accident since 2011 (since 2012 at some sites): Japanese cedar at four sites, hinoki cypress and Japanese konara oak at two sites, and Japanese red pine at one site. Our previous report on Cs concentrations in bark and whole wood samples collected from 2011 to 2015 suggested that temporal variations were different among sites even within the same species. In the present study, we provided data on bark and whole wood samples in 2016 and separately measured Cs concentrations in sapwood and heartwood samples from 2011 to 2016; we further discussed temporal trends in Cs concentrations in each part of tree stems, particularly those in Cs distributions between sapwood and heartwood, in relation to their species and site dependencies. Temporal trends in bark and whole wood samples collected from 2011 to 2016 were consistent with those reported in samples collected from 2011 to 2015. Temporal variations in Cs concentrations in barks showed either a decreasing trend or no clear trend, implying that Cs deposition in barks is inhomogeneous and that decontamination is relatively slow in some cases. Temporal trends in Cs concentrations in sapwood, heartwood, and whole wood were different among species and also among sites within the same species. Relatively common trends within the same species, which were increasing, were observed in cedar heartwood, and in oak sapwood and whole wood. On the other hand, the ratio of Cs concentration in heartwood to that in sapwood (fresh weight basis) was commonly increased to more than 2 in cedar, although distinct temporal trends were not found in the other species, for which the ratio was around 1 in cypress and pine and below 0.5 in oak, suggesting that Cs transfer from sapwood to heartwood shows species dependency. Consequently, the species dependency of Cs transfer within the tree appears easily, while that from the environment to the trees can be masked by various factors. Thus, prediction of Cs concentrations in stem wood should be carried out carefully as it still requires investigations at multiple sites with a larger sample size and an understanding of the species-specific Cs transfer mechanism.
[Mh] Termos MeSH primário: Radioisótopos de Césio/análise
Acidente Nuclear de Fukushima
Monitoramento de Radiação
Poluentes Radioativos/análise
Árvores/química
[Mh] Termos MeSH secundário: Chamaecyparis
Cryptomeria
Florestas
Madeira/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cesium Radioisotopes); 0 (Radioactive Pollutants)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171110
[Lr] Data última revisão:
171110
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171002
[St] Status:MEDLINE


  2 / 476 MEDLINE  
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[PMID]:28117719
[Au] Autor:Matsubara E; Tsunetsugu Y; Ohira T; Sugiyama M
[Ad] Endereço:Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba 305-8687, Japan. meri@ffpri.affrc.go.jp.
[Ti] Título:Essential Oil of Japanese Cedar (Cryptomeria japonica) Wood Increases Salivary Dehydroepiandrosterone Sulfate Levels after Monotonous Work.
[So] Source:Int J Environ Res Public Health;14(1), 2017 Jan 21.
[Is] ISSN:1660-4601
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Employee problems arising from mental illnesses have steadily increased and become a serious social problem in recent years. Wood is a widely available plant material, and knowledge of the psychophysiological effects of inhalation of woody volatile compounds has grown considerably. In this study, we established an experimental method to evaluate the effects of Japanese cedar wood essential oil on subjects performing monotonous work. Two experiment conditions, one with and another without diffusion of the essential oil were prepared. Salivary stress markers were determined during and after a calculation task followed by distribution of questionnaires to achieve subjective odor assessment. We found that inhalation of air containing the volatile compounds of Japanese cedar wood essential oil increased the secretion of dehydroepiandrosterone sulfate (DHEA-s). Slight differences in the subjective assessment of the odor of the experiment rooms were observed. The results of the present study indicate that the volatile compounds of Japanese cedar wood essential oil affect the endocrine regulatory mechanism to facilitate stress responses. Thus, we suggest that this essential oil can improve employees' mental health.
[Mh] Termos MeSH primário: Tédio
Cryptomeria
Sulfato de Desidroepiandrosterona/metabolismo
Óleos Voláteis/farmacologia
[Mh] Termos MeSH secundário: Administração por Inalação
Adulto
Seres Humanos
Masculino
Óleos Voláteis/administração & dosagem
[Pt] Tipo de publicação:CLINICAL TRIAL; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Oils, Volatile); 57B09Q7FJR (Dehydroepiandrosterone Sulfate); 8023-85-6 (cedarwood oil)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170713
[Lr] Data última revisão:
170713
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170125
[St] Status:MEDLINE


  3 / 476 MEDLINE  
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[PMID]:28098835
[Au] Autor:Takikawa Y; Matsuda Y; Nonomura T; Kakutani K; Kusakari SI; Toyoda H
[Ad] Endereço:Plant Center, Institute of Advanced Technology, Kindai University, Wakayama 642-0017, Japan. takikawa@waka.kindai.ac.jp.
[Ti] Título:An Electrostatic-Barrier-Forming Window that Captures Airborne Pollen Grains to Prevent Pollinosis.
[So] Source:Int J Environ Res Public Health;14(1), 2017 Jan 15.
[Is] ISSN:1660-4601
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:An electrostatic-barrier-forming window (EBW) was devised to capture airborne pollen, which can cause allergic pollinosis. The EBW consisted of three layers of insulated conductor wires (ICWs) and two voltage generators that supplied negative charges to the two outer ICW layers and a positive charge to the middle ICW layer. The ICWs generated an attractive force that captured pollen of the Japanese cedar, , from air blown through the EBW. The attractive force was directly proportional to the applied voltage. At ≥3.5 kV, the EBW exerted sufficient force to capture all pollen carried at an air flow of 3 m/s, and pollen-free air passed through the EBW. The findings demonstrated that the electrostatic barrier that formed inside the EBW was very effective at capturing airborne pollen; thus, it could allow a home to remain pollen-free and healthy despite continuous pollen exposure.
[Mh] Termos MeSH primário: Estruturas de Acesso
Cryptomeria/efeitos adversos
Pólen/efeitos adversos
Prevenção Primária/instrumentação
Rinite Alérgica Sazonal/etiologia
Rinite Alérgica Sazonal/prevenção & controle
Eletricidade Estática
[Mh] Termos MeSH secundário: Poluentes Atmosféricos/efeitos adversos
Alérgenos/efeitos adversos
Feminino
Seres Humanos
Masculino
Pólen/imunologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Allergens)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170807
[Lr] Data última revisão:
170807
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170119
[St] Status:MEDLINE


  4 / 476 MEDLINE  
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[PMID]:28032262
[Au] Autor:Takashima T; Ohnuma T; Fukamizo T
[Ad] Endereço:Department of Advanced Bioscience, Kindai University, 3327-204, Nakamachi, Nara, 631-8505, Japan.
[Ti] Título:NMR assignments and ligand-binding studies on a two-domain family GH19 chitinase allergen from Japanese cedar (Cryptomeria japonica) pollen.
[So] Source:Biomol NMR Assign;11(1):85-90, 2017 Apr.
[Is] ISSN:1874-270X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A two-domain family GH19 chitinase from Japanese cedar (Cryptomeria japonica) pollen, CJP-4, which consists of an N-terminal CBM18 domain and a GH19 catalytic domain, is known to be an important allergen, that causes pollinosis. We report here the resonance assignments of the NMR spectrum of CJP-4. The backbone resonances were almost completely assigned, and the secondary structure was estimated based on the chemical shift values. The addition of a chitin dimer to the enzyme solution perturbed the chemical shifts of the resonances of amino acid residues forming a long extended binding site spanning from the CBM18 domain to the GH19 catalytic domain.
[Mh] Termos MeSH primário: Alérgenos/química
Alérgenos/metabolismo
Quitinases/química
Quitinases/metabolismo
Cryptomeria/enzimologia
Ressonância Magnética Nuclear Biomolecular
[Mh] Termos MeSH secundário: Ligantes
Modelos Moleculares
Ligação Proteica
Domínios Proteicos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Allergens); 0 (Ligands); EC 3.2.1.14 (Chitinases)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171024
[Lr] Data última revisão:
171024
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161230
[St] Status:MEDLINE
[do] DOI:10.1007/s12104-016-9725-4


  5 / 476 MEDLINE  
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[PMID]:27986566
[Au] Autor:Kamei R; Fujimura T; Matsuda M; Kakihara K; Hirakawa N; Baba K; Ono K; Arakawa K; Kawamoto S
[Ad] Endereço:Hiroshima Research Center for Healthy Aging (HiHA), Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Japan.
[Ti] Título:A flavanone derivative from the Asian medicinal herb (Perilla frutescens) potently suppresses IgE-mediated immediate hypersensitivity reactions.
[So] Source:Biochem Biophys Res Commun;483(1):674-679, 2017 Jan 29.
[Is] ISSN:1090-2104
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Perilla frutescens is a dietary leafy herb consumed as a traditional Japanese condiment as well as used for Chinese medicine with anti-inflammatory activity. Here we report a hitherto-unrecognized P. frutescens phytochemical that potently suppresses IgE-mediated type I hypersensitivity reactions. Structural analysis reveals that the purified anti-allergic compound (Perilla-derived methoxyflavanone, PDMF) is identified as 8-hydroxy-5,7-dimethoxyflavanone. PDMF significantly inhibits IgE-mediated histamine release from RBL-2H3 rat basophilic leukemia cells as compared with those seen in known P. frutescens-derived anti-inflammatory polyphenols. We also show that oral administration of PDMF not only suppresses passive cutaneous anaphylaxis, but also prevents allergic rhinitis-like nasal symptoms in a murine model of Japanese cedar pollinosis. Mechanistically, PDMF negatively regulates Akt phosphorylation and intracellular Ca influx, both of which are essential for mast cell secretory granule translocation and its exocytosis upon high-affinity IgE receptor (FcεRI) cross-linking. These results represent PDMF as a new potent anti-allergic phytochemical useful for prevention of IgE-driven hypersensitivity reactions.
[Mh] Termos MeSH primário: Antialérgicos/administração & dosagem
Medicamentos de Ervas Chinesas/administração & dosagem
Flavanonas/administração & dosagem
Hipersensibilidade Imediata/prevenção & controle
Imunoglobulina E/imunologia
Perilla frutescens/química
Plantas Medicinais/química
Rinite Alérgica Sazonal/tratamento farmacológico
[Mh] Termos MeSH secundário: Animais
Antialérgicos/química
Antialérgicos/isolamento & purificação
Antialérgicos/farmacologia
Linhagem Celular Tumoral
Cryptomeria/imunologia
Modelos Animais de Doenças
Medicamentos de Ervas Chinesas/química
Medicamentos de Ervas Chinesas/isolamento & purificação
Medicamentos de Ervas Chinesas/farmacologia
Feminino
Flavanonas/química
Flavanonas/isolamento & purificação
Flavanonas/farmacologia
Liberação de Histamina/efeitos dos fármacos
Camundongos
Camundongos Endogâmicos BALB C
Anafilaxia Cutânea Passiva/efeitos dos fármacos
Ratos
Receptores de IgE/imunologia
Rinite Alérgica Sazonal/prevenção & controle
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (8-hydroxy-5,7-dimethoxyflavanone); 0 (Anti-Allergic Agents); 0 (Drugs, Chinese Herbal); 0 (Flavanones); 0 (Receptors, IgE); 37341-29-0 (Immunoglobulin E)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170529
[Lr] Data última revisão:
170529
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161218
[St] Status:MEDLINE


  6 / 476 MEDLINE  
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[PMID]:27878983
[Au] Autor:Ohta Y; Hasegawa R; Kurosawa K; Maeda AH; Koizumi T; Nishimura H; Okada H; Qu C; Saito K; Watanabe T; Hatada Y
[Ad] Endereço:Research and Development Center for Marine Biosciences, Japan Agency for Marine-Earth Science and Technology, JAMSTEC, 2-15 Natsushima, Yokosuka, Kanagawa, 237-0061, Japan.
[Ti] Título:Enzymatic Specific Production and Chemical Functionalization of Phenylpropanone Platform Monomers from Lignin.
[So] Source:ChemSusChem;10(2):425-433, 2017 Jan 20.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Enzymatic catalysis is an ecofriendly strategy for the production of high-value low-molecular-weight aromatic compounds from lignin. Although well-definable aromatic monomers have been obtained from synthetic lignin-model dimers, enzymatic-selective synthesis of platform monomers from natural lignin has not been accomplished. In this study, we successfully achieved highly specific synthesis of aromatic monomers with a phenylpropane structure directly from natural lignin using a cascade reaction of ß-O-4-cleaving bacterial enzymes in one pot. Guaiacylhydroxylpropanone (GHP) and the GHP/syringylhydroxylpropanone (SHP) mixture are exclusive monomers from lignin isolated from softwood (Cryptomeria japonica) and hardwood (Eucalyptus globulus). The intermediate products in the enzymatic reactions show the capacity to accommodate highly heterologous substrates at the substrate-binding sites of the enzymes. To demonstrate the applicability of GHP as a platform chemical for bio-based industries, we chemically generate value-added GHP derivatives for bio-based polymers. Together with these chemical conversions for the valorization of lignin-derived phenylpropanone monomers, the specific and enzymatic production of the monomers directly from natural lignin is expected to provide a new stream in "white biotechnology" for sustainable biorefineries.
[Mh] Termos MeSH primário: Acetona/química
Biocatálise
Glutationa Transferase/metabolismo
Lignina/química
Propiofenonas/química
[Mh] Termos MeSH secundário: Cryptomeria/enzimologia
Eucalyptus/enzimologia
Concentração de Íons de Hidrogênio
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Propiophenones); 1364PS73AF (Acetone); 9005-53-2 (Lignin); EC 2.5.1.18 (Glutathione Transferase)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170523
[Lr] Data última revisão:
170523
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161124
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201601235


  7 / 476 MEDLINE  
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[PMID]:27858705
[Au] Autor:Chiba S; Yokoyama H; Kumazawa A; Shimmoto M; Naganawa Y; Shinmoto H
[Ad] Endereço:Tamagawa University, College of Agriculture, Machida, Tokyo, Japan.
[Ti] Título:Epitope analysis of Japanese cedar pollen allergen Cry j2 with a human IgM class monoclonal antibody 404-117.
[So] Source:Hum Antibodies;25(1-2):17-21, 2017.
[Is] ISSN:1875-869X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Japanese cedar pollen allergen Cry j2 is a causal allergen of seasonal pollinosis in Japan. To analyze B cell epitopes of Cry j2, we established two human-mouse hybridomas secreting IgM class human monoclonal antibodies to Cry j2. A pin-peptide enzyme-linked immunosorbent assay with synthesized icosa peptides showed that 404-117 monoclonal antibody bound to peptides #11-13 with cry j2 amino acid sequence of 101F-L140. Detailed analysis with octa peptides and alanine substituted peptides indicated that an amino acid sequence of 118FKVD121 was an essential for antibody binding. When K119 (Asn) was substituted with alanine, 404-117 monoclonal antibody did not bind to the alanine substituted peptide. We concluded that the 118FKVD121 sequence might have a very important role in early recognition by Cry j2-specific B cells, which could act as antigen presenting cells.
[Mh] Termos MeSH primário: Anticorpos Monoclonais/biossíntese
Epitopos/imunologia
Imunoglobulina M/biossíntese
Proteínas de Plantas/imunologia
Pólen/imunologia
Rinite Alérgica Sazonal/imunologia
[Mh] Termos MeSH secundário: Alérgenos/química
Alérgenos/imunologia
Sequência de Aminoácidos
Animais
Especificidade de Anticorpos
Células Apresentadoras de Antígenos/imunologia
Células Apresentadoras de Antígenos/patologia
Antígenos de Plantas/química
Antígenos de Plantas/imunologia
Linfócitos B/imunologia
Linfócitos B/patologia
Sítios de Ligação
Cryptomeria/química
Cryptomeria/imunologia
Epitopos/química
Seres Humanos
Hibridomas/imunologia
Hibridomas/secreção
Japão
Camundongos
Peptídeos/química
Peptídeos/imunologia
Proteínas de Plantas/química
Pólen/química
Ligação Proteica
Rinite Alérgica Sazonal/induzido quimicamente
Rinite Alérgica Sazonal/patologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Allergens); 0 (Antibodies, Monoclonal); 0 (Antigens, Plant); 0 (Cry j II protein, Cryptomeria japonica); 0 (Epitopes); 0 (Immunoglobulin M); 0 (Peptides); 0 (Plant Proteins)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170310
[Lr] Data última revisão:
170310
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161119
[St] Status:MEDLINE
[do] DOI:10.3233/HAB-160301


  8 / 476 MEDLINE  
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[PMID]:27475625
[Au] Autor:Hashiguchi K; Wakabayashi KI; Togawa M; Saito A; Okubo K
[Ad] Endereço:Department of Otolaryngology, Futaba Clinic, Tokyo, Japan. Electronic address: futaba-hashi@h00.itscom.net.
[Ti] Título:Therapeutic effect of bilastine in Japanese cedar pollinosis using an artificial exposure chamber (OHIO Chamber).
[So] Source:Allergol Int;66(1):123-131, 2017 Jan.
[Is] ISSN:1440-1592
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Environmental exposure chambers have been used to expose subjects to aeroallergens to investigate the efficacy of prophylactic treatment with symptomatic agents in Japan. We first examined the therapeutic effect of bilastine (BIL), a novel non-sedative second-generation H -antihistamine, in subjects with Japanese cedar pollinosis using an artificial exposure chamber (OHIO Chamber). METHODS: This was a randomized, double-blind, four-way crossover, placebo- and active-controlled phase II study (trial registration number JapicCTI-132213). Subjects were exposed to cedar pollen (8000 grains/m ) for 2 h on Day -1 and 4 h each on Day 1 and 2. BIL 10 or 20 mg, placebo, or fexofenadine hydrochloride (FEX) 60 mg was administered orally 1 h after the start of pollen exposure on Day 1. Placebo or FEX was administered 12 h after the first dosing. The primary efficacy endpoint was the sum of total nasal symptom score (TNSS) from 0 to 3 h after the Day 1 dosing. RESULTS: We enrolled 136 subjects and the sum of TNSS on Day 1 of the three active treatments was significantly lower than that of placebo and was maintained up to 26 h after the first dosing (Day 2). The sum of TNSS or sneezing score on Day 1 after BIL 20 mg was more significantly decreased than after FEX. Moreover, BIL showed a faster onset of action than FEX. CONCLUSIONS: We demonstrated the efficacy, rapid onset, and long duration of action of BIL in subjects with Japanese cedar pollinosis exposed to cedar pollen using the OHIO Chamber.
[Mh] Termos MeSH primário: Benzimidazóis/administração & dosagem
Cryptomeria
Piperidinas/administração & dosagem
Rinite Alérgica Sazonal/tratamento farmacológico
[Mh] Termos MeSH secundário: Adulto
Benzimidazóis/efeitos adversos
Método Duplo-Cego
Feminino
Seres Humanos
Masculino
Meia-Idade
Piperidinas/efeitos adversos
Rinite Alérgica Sazonal/imunologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Benzimidazoles); 0 (Piperidines); PA1123N395 (bilastine)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170123
[Lr] Data última revisão:
170123
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160801
[St] Status:MEDLINE


  9 / 476 MEDLINE  
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[PMID]:26948679
[Au] Autor:Yoschenko V; Takase T; Konoplev A; Nanba K; Onda Y; Kivva S; Zheleznyak M; Sato N; Keitoku K
[Ad] Endereço:Institute of Environmental Radioactivity of Fukushima University, 1 Kanayagawa, Fukushima, Fukushima Prefecture, 960-1296, Japan. Electronic address: r705@ipc.fukushima-u.ac.jp.
[Ti] Título:Radiocesium distribution and fluxes in the typical Cryptomeria japonica forest at the late stage after the accident at Fukushima Dai-Ichi Nuclear Power Plant.
[So] Source:J Environ Radioact;166(Pt 1):45-55, 2017 Jan.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The Fukushima-derived radiocesium distribution in the typical Japanese cedar (Cryptomeria japonica D. Don) forest ecosystem was determined. In four years after the Fukushima accident, about 74% of the total radiocesium inventory was localized in soil, 20% was in the litter, and only 6% was associated with the aboveground biomass. Most of the radiocesium that was initially intercepted by the tree canopies has been already transported to the ground surface. The importance of the processes for removal of radiocesium from the tree canopies decreased in the order litterfall > throughfall >> stemflow. Within the tree compartments, the largest radiocesium activity fraction, about 46%, was observed in old foliage, which indicates that the process of removal of the initial deposit from the tree crowns has not yet completed. The aggregate soil-to-wood transfer factor was 1.1â‹…10 m kg d.w., which is close to the geometric means of transfer factors recommended by IAEA for other coniferous tree species. Further studies in Fukushima forest are necessary to assess the variation of this parameter under various soil-landscape conditions. Presence of the residues of the initial deposits does not allow to obtain the accurate values of the annual radiocesium fluxes in the ecosystem. Based on the conservative assumptions, the ranges of the fluxes were estimated. Analysis of the flux structures shows that up to percents of the total radiocesium activity in the ecosystem may be involved into biogenic cycling.
[Mh] Termos MeSH primário: Radioisótopos de Césio/análise
Cryptomeria
Florestas
Acidente Nuclear de Fukushima
Poluentes Radioativos do Solo/análise
[Mh] Termos MeSH secundário: Monitoramento de Radiação
Cinza Radioativa/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cesium Radioisotopes); 0 (Radioactive Fallout); 0 (Soil Pollutants, Radioactive)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170407
[Lr] Data última revisão:
170407
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160308
[St] Status:MEDLINE


  10 / 476 MEDLINE  
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[PMID]:26021767
[Au] Autor:Kato H; Onda Y; Hisadome K; Loffredo N; Kawamori A
[Ad] Endereço:Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, Japan. Electronic address: hiros980@ies.life.tsukuba.ac.jp.
[Ti] Título:Temporal changes in radiocesium deposition in various forest stands following the Fukushima Dai-ichi Nuclear Power Plant accident.
[So] Source:J Environ Radioact;166(Pt 3):449-457, 2017 Jan.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, we investigated the transfer of canopy-intercepted radiocesium to the forest floor following the Fukushima Dai-ichi Nuclear Power Plant accident. The Cs content of throughfall, stemflow, and litterfall were monitored in two coniferous stands (plantations of Japanese cedar) and a deciduous mixed broad-leaved forest stand (oak with red pine) from July 2011 to December 2012. The forest floor of cedar stands had received higher levels of additional Cs deposition compared with the mixed broad-leaved stand during the sampling period. The cumulative Cs deposition during the study period was 119 kBq m for the mature cedar stand, 105 kBq m for the young cedar stand, and 41.5 kBq m for the broad-leaved stand. The deposition of Cs to the forest floor occurred mainly in throughfall during the first rainy season, from July to September 2011 (<200 d after the initial fallout); thereafter, the transfer of Cs from the canopy to forest floor occurred mainly through litterfall. A double exponential field-loss model, which was used to simulate the removal of Cs from canopies, was the best fit for the temporal changes in the canopy Cs inventory.
[Mh] Termos MeSH primário: Radioisótopos de Césio/análise
Florestas
Acidente Nuclear de Fukushima
Cinza Radioativa
[Mh] Termos MeSH secundário: Cryptomeria
Japão
Pinus
Folhas de Planta
Caules de Planta
Quercus
Monitoramento de Radiação
Chuvas/química
Viburnum
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cesium Radioisotopes); 0 (Radioactive Fallout)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170316
[Lr] Data última revisão:
170316
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150530
[St] Status:MEDLINE



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