ABSTRACT
In this paper, a marine environmental sensitivity index system was constructed based on three factors: the marine biological species sensitivity, the marine ecological value sensitivity and the social and economic sensitivity. Combined with numerical simulations of 137Cs in the Beibu Gulf under the condition of a level-7 nuclear accident, a comprehensive risk assessment of marine radioactivity under the simulated accident in the Beibu Gulf was carried out. The results show that the areas at high risk and medium-to-high risk to marine radioactivity are mainly concentrated within 30 km of the Fangchenggang Nuclear Power Plant. The medium-risk areas are mainly distributed in sea areas within 30-50 km of the nuclear power plant, and the other sea areas are low-risk areas. The distribution of the risk sources and the characteristics of the regional tidal currents are the main factors affecting the magnitude and distribution of the comprehensive risk of regional marine radioactivity.
Subject(s)
Radioactivity , Water Pollutants, Chemical , China , Environmental Monitoring , Risk Assessment , Water Pollutants, Chemical/analysisABSTRACT
Generally, cesium ion (Cs+) which concentration of above the millimolar order is toxic to microorganisms. In this study we report the isolation and genomic characteristics of Bacillus sp. Cs-700, which can grow in media supplemented with 700 mM Cs+ and was one of the most Cs+ tolerating bacteria been reported. Bacillus sp. Cs-700 was isolated from the South China Sea, and comprised one circular chromosome of 4,297,839 bp (40.32 mol% G + C content), containing 4366 predicted protein-coding sequences. We predict that numerous genes related to high cesium tolerating, and the genome of Bacillus sp. Cs-700 will be helpful for further insights into the mechanism of bacterial resistance to excess Cs+ conditions and the bioremediation of radiocesium-polluting environments.
Subject(s)
Bacillus/genetics , Genome, Bacterial , Geologic Sediments/microbiology , Bacillus/metabolism , Cesium/physiology , Ions , Pacific Ocean , Whole Genome SequencingABSTRACT
The Roseophages, a group of marine viruses that uniquely infect the Roseobacter clade of bacteria, play a significant role in marine ecosystems. Here we present a complete genomic sequence of an N4 phage 'vB_DshP-R1', which infects Dinoroseobacter shibae DFL12, together with its structural and genomic features. vB_DshP-R1 has an ~ 75 nm diameter icosahedral structure and a complete genome of 75,028 bp. This is the first genome sequence of a lytic phage of the genus Dinoroseobacter.
ABSTRACT
[This corrects the article DOI: 10.1186/1944-3277-10-6.].
ABSTRACT
The Roseophages, a group of marine viruses that uniquely infect the Roseobacter clade of bacteria, play a significant role in marine ecosystems. Here we present a complete genomic sequence of an N4 phage 'vB_DshP-R1', which infects Dinoroseobacter shibae DFL12, together with its structural and genomic features. vB_DshP-R1 has an ~ 75 nm diameter icosahedral structure and a complete genome of 75,028 bp. This is the first genome sequence of a lytic phage of the genus Dinoroseobacter.