Grounding a natural background level for fluoride in a potentially contaminated crystalline aquifer in south India

2017 ◽  
Vol 24 (34) ◽  
pp. 26623-26633 ◽  
Author(s):  
P. J. Sajil Kumar
Keyword(s):  
South India ◽  
Background Level ◽  
Natural Background ◽  
Natural Background Level ◽  
Crystalline Aquifer

scholarly journals Relationship Between Biological Control, Incidence of Hypovirulence, and Diversity of Vegetative Compatibility Types of Cryphonectria parasitica in France

2000 ◽  
Vol 90 (7) ◽  
pp. 730-737 ◽  
Author(s):  
Cécile Robin ◽  
Carole Anziani ◽  
Paolo Cortesi
Keyword(s):  
Biological Control ◽  
Allelic Diversity ◽  
Background Level ◽  
Cryphonectria Parasitica ◽  
Vegetative Compatibility ◽  
Chestnut Blight ◽  
Natural Background ◽  
Vegetative Incompatibility ◽  
Natural Background Level ◽  
Two Parameters

In France, chestnut blight, caused by Cryphonectria parasitica, has been controlled since 1974 in orchards, but never in coppice forests, by releasing hypovirulent strains infected with CHV1 hypovirus. We tested the hypothesis that this biological control (BC) has lead to a decrease in blight severity, spread of hypovirulence, and change in C. parasitica populations. The low severity of chestnut blight was confirmed in the six regions studied (subdivided into zones). The remission of cankers was associated with the presence of white isolates presumed to be hypovirulent. These two parameters were also correlated, at the zonal level, to the frequency of sites where BC was used. However, the estimates of the natural background level of hypovirulence, independent of BC, ranged from 4% in forests in Dordogne to 60% in orchards in Lozère. Differences in the rate of hypovirulent isolates among regions were consistent with the diversity of vegetative compatibility (VC) types in populations of C. parasitica. The highest VC-type diversity and mean allelic diversity for known vegetative incompatibility (vic) genes were observed in Dordogne. We showed that the current diversity of VC types in populations of C. parasitica was lower than in 1981. We found 30 VC types among 1,113 isolates of C. parasitica. Ten VC types were incompatible with known EU testers, suggesting that one additional vic gene or allele at one of the six vic loci known should be present in Europe.

PUBLIC HEALTH IN RADON­AFFECTED TERRITORIES

2019 ◽  
pp. 40-50
Keyword(s):  
Public Health ◽  
Methodological Approach ◽  
Computer Software ◽  
Background Level ◽  
Integrated Analysis ◽  
Building Structures ◽  
Natural Background ◽  
Residential Areas ◽  
Natural Background Level ◽  
Hazard Level

The aim of the study is to conduct the geoecological assessment of the territory’s radon hazard and its impact on the public health. Methods. The following methods were used during the study: cartographic method, geoinformation method, statistical method and mathematical modeling method. Secondary operations were carried out with the computer software Arc GIS 9.2, CorelDraw 9.0, Adobe Photoshop 10.0, Macromedia Flash MX, Statistica 10.0. Results. The article presents a methodological approach to studying the geographical distribution of radon. To ensure the quality of life for the population one requires a comprehensive radon monitoring, including the study of its natural background level as well as the area building structures and the rate of cancer related diseases. Analyzing the geotectonic typology of residential areas provides an opportunity to identify the main types of (human) settlements with a focus on their radon hazard level. While assessing the risk of cancer­related diseases and outlining the factors that affect the lung cancer rate it is essential to consider the deviations from the average ratio of nosological forms. One has developed the GIS mechanism to monitor territories, which ­ if combined with cartographic models ­ enables to quickly determine their radon hazard level. The suggested methodological approach makes it possible to identify the areas with ecological risk for the inhabitants due to the radon hazard of both populated land and the one to be populated in the future. The increasing emphasis is being laid on the residential areas located on tectonic fault lines. Conclusions. The natural background level of radon for the investigated region was identified during the integrated analysis of the territory radon hazard level. The cartographic approach reveals spatial patterns of cancer­related diseases and allows mapping the territory according to the degree of cancer risk.

Radon Impact at a Remediated Uranium Mine Site in Japan

2010 ◽  
Author(s):  
Yuu Ishimori
Keyword(s):  
Flux Density ◽  
Background Level ◽  
Waste Rock ◽  
Uranium Mine ◽  
Remedial Action ◽  
Natural Background ◽  
Mine Site ◽  
Radon Flux ◽  
Natural Background Level ◽  
Radon Concentrations

This paper mainly illustrates the radon impact of the closed uranium mine site remediated in 2007. The site remediated is the waste rock site located on the steep slope of a hill about 1.5 km upstream from a residential area along a main ravine. Major remedial action was to cover these waste rock yards with weathering granite soil. The radon flux density after remediation was intended to be 0.1 Bqm−2s−1 in consideration with the natural background level around Ningyo-toge because there is no value of radon flux density regulated in Japan. Our action decreased the radon concentration in the site to natural background level, approximately from 10 to 40 Bqm−3, although relatively high concentration in excess of 100 Bqm−3 was observed before remediation. On the other hand, our action did not decrease the radon concentrations around the site in general. This fact proved that the limited source such as waste rocks affected the radon concentrations at neighboring area only. The similar tendencies were also observed in other environmental data such as radon progeny concentrations. In conclusion, these findings proved that our remedial action was successful against radon. This fact will lead to more reasonable action plans for other closed mine sites.

Natural background level assessment in groundwaters: probability plot versus pre-selection method

2014 ◽  
Vol 143 ◽  
pp. 43-53 ◽  
Author(s):  
Elisabetta Preziosi ◽  
Daniele Parrone ◽  
Andrea Del Bon ◽  
Stefano Ghergo
Keyword(s):  
Background Level ◽  
Selection Method ◽  
Natural Background ◽  
Natural Background Level ◽  
Probability Plot

scholarly journals Natural Background Level Analysis of Heavy Metal Concentration in Korean Coastal Sediments

2007 ◽  
Vol 29 (4) ◽  
pp. 379-389 ◽  
Author(s):  
Dhong-Il Lim ◽  
Jin-Yong Choi ◽  
Hoi-Soo Jung ◽  
Hyun-Woo Choi ◽  
Young-Ok Kim
Keyword(s):  
Heavy Metal ◽  
Metal Concentration ◽  
Background Level ◽  
Heavy Metal Concentration ◽  
Coastal Sediments ◽  
Natural Background ◽  
Natural Background Level ◽  
Level Analysis

scholarly journals Geostatistics as a tool to improve the natural background level definition: An application in groundwater

2017 ◽  
Vol 598 ◽  
pp. 330-340 ◽  
Author(s):  
Nico Dalla Libera ◽  
Paolo Fabbri ◽  
Leonardo Mason ◽  
Leonardo Piccinini ◽  
Marco Pola
Keyword(s):  
Background Level ◽  
Natural Background ◽  
Natural Background Level
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