Studies on uptake of cesium by mycelium of the mushroom (Pleurotus ostreatus) by133Cs-NMR

Kuwahara, Chikako; Watanuki, Tomohiko; Matsushita, Kazuhiro; Nishina, Masami; Sugiyama, Hideo

doi:10.1007/bf02385960

Cited by 10 publications

(9 citation statements)

References 17 publications

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“…A reason for radiocesium contamination to be high in mushrooms appears to be because of potassium richness (Seeger 1978 ). However, fungi also absorb cesium more specifi cally compared with potassium (Kuwahara et al 1998 ), particularly radiocesium (Tsukada et al 1998 ). Further research is necessary to reveal the absorption and accumulation processes.…”

Section: Introductionmentioning

confidence: 99%

Mushrooms: Radioactive Contamination of Widespread Mushrooms in Japan

Yamada

2013

Agricultural Implications of the Fukushima Nuclear Accident

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High concentrations of radionuclide contamination of wild mushrooms occurred near the Fukushima Daiichi nuclear power plant and along the path of radioactive plumes. This is a serious problem for the forest ecosystem and commercial wild mushroom production. Radioactivity in wild mushrooms collected from low-level contamination forest areas throughout Japan was measured approximately 6 months after the accident. In general, the radioactivity in mushrooms did not exceed those in the neighboring forest litter. However, further accumulation of 137 Cs is expected in mushrooms; therefore, continuous monitoring is necessary even in low-contamination areas. We also found that residual 137 Cs radioactivity due to nuclear weapons tests, mainly in 1950s, besides fallout from the Fukushima nuclear accident still remained in soil and was accumulated by mushrooms.

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Section: Introductionmentioning

confidence: 99%

Mushrooms: Radioactive Contamination of Widespread Mushrooms in Japan

Yamada

2013

Agricultural Implications of the Fukushima Nuclear Accident

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“…Among others, mushrooms are known to contain high levels of 137 Cs. [18][19][20][21][22][23][24] The contribution of group 6 to the intake of stable elements also seems to be high. During the survey period, 137 Cs was often detected from imported foods, but it was not possible to identify imported foods in the menus.…”

Section: Relationship Between Meal Ingredients and Element Intakementioning

confidence: 99%

Evaluation of Cesium-137 (137Cs) and Elements Intake from Daily Diets in Residents of Kanagawa Prefecture, Japan

Iijima

Takagi

Tomura

et al. 2009

JOURNAL OF HEALTH SCIENCE

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The present study was undertaken to investigate the amounts of artificial radionuclides ingested through the daily diet by inhabitants of Kanagawa Prefecture, Japan. To this end, the level of cesium-137 ( 137 Cs) contained in the daily diets of females (combined samples from 5 females) aged 40-69 living in urban and suburban districts of Kanagawa Prefecture was measured. Furthermore, 11 elements (Ca, Cl, Cr, Cs, Fe, K, Mn, Na, Rb, Sc, and Zn) in the diets were quantified by instrumental neutron activation analysis. The study revealed that the intake of 137 Cs increased markedly in 1986, the year the Chernobyl accident occurred, and it tended to decrease gradually thereafter. In recent years, the reduction in the dietary intake of 137 Cs has been slowing down. When the intake of nutrients ingested by inhabitants of the two survey areas was compared with the Dietary Reference Intakes for Japanese (2005), the amount ingested in each of the two survey areas approximately satisfied or was slightly lower than the reference levels. Among others, the amount of Ca and Fe ingested in the urban district was particularly low (52 and 64% of the national reference, respectively). For many elements, the amount ingested was greater in the suburban than in the urban district. When the ingredients of the subjects' meals were classified into food groups, the meals prepared by suburban inhabitants were found to be composed of more diverse ingredients, covering all food groups, compared to those prepared by urban inhabitants. The daily food intake was also greater in the suburban district. When the daily dietary samples from individual subjects were analyzed separately, without being combined, both the level of 137 Cs and the amount of stable elements contained in the separate samples showed greater variations from day to day than those in the combined samples. There was no correlation between the dietary intake of 137 Cs and that of Cs.

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“…Dried samples were placed in plastic bottles and concentrations of radionuclides were determined with a Ge-detector. Stable Cs was measured by instrumental neutron activation analysis (INAA) after cooling for several months as described by Kuwahara et al [9].…”

Section: Samples and Analyses Of Wild Mushroomsmentioning

confidence: 99%

“…Elemental analysis was carried out as described by Kato et al [12]. 133 Cs-NMR analysis of the mycelia of S. lividans TK24, cultured in YM broth containing lOmM Cs in the medium, was performed by NMR spectrometry with an external reference capillary tube containing lOOmM CsCl and 50mM Dy (P3O]0) 7 -, as described by Kuwahara et al [9].…”

Section: Sem Observation and Elemental Analysis Of Cultured Mycelia Omentioning

confidence: 99%

Cesium uptake by edible mushrooms and microorganisms isolated from mushroom substrata

2002

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Abstract. The concentrations of 137 Cs and stable Cs were measured in wild mushrooms, mushroom substrata and soils from Mt.Fuji in Japan. We then studied the Cs uptake by the edible mushroom, Pleurotus ostreatus, through the cultured experiments using 13, Cs and/or a stable Cs tracer. !3, Cs am central ions in the fruiting bodies were 2-4 orders of magnitude higher than those in the wild mushrooms collected in Japan. It was demonstrated that 13 'Cs and Cs were actively uptaken by the mushrooms depending on the 137 Cs or Cs concentration in the medium. We subsequently investigated the Cs sensitivity of microorganisms in the mushroom substrata and Cs uptake by actinomycetes, one of the soil microorganisms in mushroom substrata The number of both bacteria and actinomycetes in the substrata decreased with increasing Cs concentration in the medium. Actinomycetes in the mushroom substrata were more sensitive to Cs than other bacteria. In the presence of 5mM CsC], Cs uplake by several strains of actinomyces was generally high, and the growth was partially inhibited compared with the Cs resistant strains, Streptomyces lividans TK24 and Streptomyces sp. TOHO-2.

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Studies on uptake of cesium by mycelium of the mushroom (Pleurotus ostreatus) by133Cs-NMR

Cited by 10 publications

References 17 publications

Mushrooms: Radioactive Contamination of Widespread Mushrooms in Japan

Mushrooms: Radioactive Contamination of Widespread Mushrooms in Japan

Evaluation of Cesium-137 (137Cs) and Elements Intake from Daily Diets in Residents of Kanagawa Prefecture, Japan

Cesium uptake by edible mushrooms and microorganisms isolated from mushroom substrata

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