Trends in mercury concentrations and methylation in Minamata Bay, Japan, between 2014 and 2018

2021 ◽  
Vol 173 ◽  
pp. 112886
Author(s):  
Akito Matsuyama ◽  
Shinichiro Yano ◽  
Yoko Taniguchi ◽  
Michiaki Kindaichi ◽  
Akihide Tada ◽  
...  
Keyword(s):  
Minamata Bay

NUMERICAL SIMULATION OF CURRENT INDUCED COHESIVE SEDIMENT TRANSPORT IN MINAMATA BAY

2018 ◽  
Vol 74 (5) ◽  
pp. I_943-I_948
Author(s):  
Changlu ZHOU ◽  
Akihide TADA ◽  
Shinichiro YANO ◽  
Akito MATSUYAMA ◽  
Changping CHEN
Keyword(s):  
Numerical Simulation ◽  
Sediment Transport ◽  
Cohesive Sediment ◽  
Cohesive Sediment Transport ◽  
Minamata Bay

scholarly journals Identification of A Novel Arsenic Resistance Transposon Nested in A Mercury Resistance Transposon of Bacillus sp. MB24

2019 ◽  
Vol 7 (11) ◽  
pp. 566 ◽  
Author(s):  
Mei-Fang Chien ◽  
Ying-Ning Ho ◽  
Hui-Erh Yang ◽  
Masaru Narita ◽  
Keisuke Miyauchi ◽  
...  
Keyword(s):  
Gene Clusters ◽  
Whole Genome Sequence ◽  
Mercury Resistance ◽  
Bacillus Sp ◽  
Arsenic Resistance ◽  
First Case ◽  
Arsenite Resistance ◽  
Ars Operon ◽  
Minamata Bay ◽  
Bacterium Bacillus

A novel TnMERI1-like transposon designated as TnMARS1 was identified from mercury resistant Bacilli isolated from Minamata Bay sediment. Two adjacent ars operon-like gene clusters, ars1 and ars2, flanked by a pair of 78-bp inverted repeat sequences, which resulted in a 13.8-kbp transposon-like fragment, were found to be sandwiched between two transposable genes of the TnMERI1-like transposon of a mercury resistant bacterium, Bacillus sp. MB24. The presence of a single transcription start site in each cluster determined by 5′-RACE suggested that both are operons. Quantitative real time RT-PCR showed that the transcription of the arsR genes contained in each operon was induced by arsenite, while arsR2 responded to arsenite more sensitively and strikingly than arsR1 did. Further, arsenic resistance complementary experiments showed that the ars2 operon conferred arsenate and arsenite resistance to an arsB-knocked out Bacillus host, while the ars1 operon only raised arsenite resistance slightly. This transposon nested in TnMARS1 was designated as TnARS1. Multi-gene cluster blast against bacteria and Bacilli whole genome sequence databases suggested that TnMARS1 is the first case of a TnMERI1-like transposon combined with an arsenic resistance transposon. The findings of this study suggested that TnMERI1-like transposons could recruit other mobile elements into its genetic structure, and subsequently cause horizontal dissemination of both mercury and arsenic resistances among Bacilli in Minamata Bay.

Spatial variations of mercury in sediment of Minamata Bay, Japan

2006 ◽  
Vol 368 (1) ◽  
pp. 283-290 ◽  
Author(s):  
Takashi Tomiyasu ◽  
Akito Matsuyama ◽  
Tomomi Eguchi ◽  
Yoko Fuchigami ◽  
Kimihiko Oki ◽  
...  
Keyword(s):  
Spatial Variations ◽  
Minamata Bay

Speciation of mercury in water at the bottom of Minamata Bay, Japan

2008 ◽  
Vol 112 (1-2) ◽  
pp. 102-106 ◽  
Author(s):  
Takashi Tomiyasu ◽  
Akito Matsuyama ◽  
Tomomi Eguchi ◽  
Kohji Marumoto ◽  
Kimihiko Oki ◽  
...  
Keyword(s):  
Minamata Bay

A Case History; Minamata Mercury Pollution in Japan – From Loss of Human Lives to Decontamination

1991 ◽  
Vol 23 (1-3) ◽  
pp. 283-290 ◽  
Author(s):  
Akira Kudo ◽  
Shojiro Miyahara
Keyword(s):  
Mercury Concentration ◽  
Industrial Wastewater ◽  
Total Mercury ◽  
Surface Sediments ◽  
Sea Water ◽  
Human Beings ◽  
Organic Mercury ◽  
Yatsushiro Sea ◽  
History Of ◽  
Minamata Bay

At Minamata Bay in Japan, more than 100 people lost their lives and many thousands more were permanently paralyzed from eating mercury contaminated fish. In the long history of water pollution, this was the first known case where the natural bioaccumulation (in fish) of a toxicant from an industrial wastewater killed a large number of human beings. The mercury, discharged from a factory, was deposited on the bottom of the Bay and has remained there since the 1950's. The fate of the mercury was traced by measuring 268 mercury concentrations in the surface sediments at Yatsushiro Sea (outside of the Bay) during the last 14 years. Twenty-four sampling stations were established to collect samples at the same location every year. Samples were analyzed for total mercury concentrations. The concentrations of mercury in the surface sediments at the Sea were not alarming. Only 33 samples exceeded a mercury concentration of 1 ppm. The dispersion of the mercury from the Bay, however, was clearly documented with the data. On average, 3.7 tons of the mercury was transported outside from the Bay every year. A decontamination project started in 1984 dramatically decreased the flow of mercury from the Bay to the Sea. A historic rainfall in 1982 also ‘purified' the surface sediments. Organic mercury concentration in the sea water was 5.1 ng/l while total mercury was 120 ng/l at the center of the Bay in 1985.

scholarly journals IN-SITU MEASUREMENT OF MERUCRY FORM AND TRANSPORT IN THE SEA WATER OF MINAMATA BAY

2012 ◽  
Vol 68 (4) ◽  
pp. I_1567-I_1572
Author(s):  
SHINICHIRO YANO ◽  
AKIRA TAI ◽  
KOHEI YANO ◽  
AKITO MATSUYAMA ◽  
RYUJI FUJIWARA ◽  
...  
Keyword(s):  
Sea Water ◽  
In Situ Measurement ◽  
Minamata Bay
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