| Symposium on 'Geographical and geological influences on nutrition': Factors controlling the distribution of selenium in the environment and their impact on health and nutrition. | |
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MedLine Citation:
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PMID: 19968907 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Se is essential to human and animal health but can be toxic in excess. An interest in its geochemistry has developed alongside a greater understanding of its function in a number of health conditions. Geology exerts a strong control on the Se status of the surface environment; low-Se rock-types (0.05-0.09 mg Se/kg) make up the majority of rocks occurring at the Earth's surface, which in turn account for the generally low levels of Se in most soils. However, there are exceptions such as associations with sulfide mineralisation and in some types of sedimentary rocks (e.g. black shales) in which contents of Se can be much higher. Baseline geochemical data now enable a comparison to be made between environmental and human Se status, although a direct link is only likely to be seen if the population is dependent on the local environment for sustenance. This situation is demonstrated with an example from the work of the British Geological Survey in the Se-deficiency belt of China. The recent fall in the daily dietary Se intake in the UK is discussed in the context of human Se status and declining use of North American wheat in bread making. Generally, US wheat has ten times more Se than UK wheat, attributed to the fact that soils from the wheat-growing belt of America are more enriched in Se to a similar order of magnitude. In agriculture effective biofortification of crops with Se-rich fertilisers must be demonstrably safe to the environment and monitored appropriately and baseline geochemical data will enable this process to be done with confidence. |
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Authors:
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Christopher C Johnson; Fiona M Fordyce; Margaret P Rayman |
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Publication Detail:
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Type: Journal Article Date: 2009-12-08 |
Journal Detail:
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Title: The Proceedings of the Nutrition Society Volume: 69 ISSN: 1475-2719 ISO Abbreviation: Proc Nutr Soc Publication Date: 2010 Feb |
Date Detail:
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Created Date: 2010-01-26 Completed Date: 2010-05-27 Revised Date: 2013-04-24 |
Medline Journal Info:
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Nlm Unique ID: 7505881 Medline TA: Proc Nutr Soc Country: England |
Other Details:
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Languages: eng Pagination: 119-32 Citation Subset: IM |
Affiliation:
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British Geological Survey, Keyworth, Nottingham NG12 5GG, UK. ccj@bgs.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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China Crops, Agricultural Diet* Environment Geography Geological Phenomena* Great Britain Humans Nutritional Status* Selenium / chemistry*, deficiency* Soil* Triticum / chemistry United States |
| Chemical | |
Reg. No./Substance:
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0/Soil; 7782-49-2/Selenium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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