0 a chemical element used in photography and also necessary in small amounts in the body (symbol Se) -- selen
Selenium is part of an enzyme that helps defend against free radicals.
Tests of various possibilities led to a focus on the effects of selenium.
Earlier studies have also shown lower levels of selenium in blood plasma in patients with rheumatoid arthritis compared to healthy individuals.
In some cases, increased salinity or toxic materials (for example arsenic, selenium) from both natural and human sources have rendered the groundwater unusable even for agricultural purposes.
Twelve chapters examine environmental deficiency and toxicity, and cover: volcanic emissions; radon; arsenic; fluoride; water hardness; selenium; iodine, aerosols and soil-borne pathogens, with more general reviews.
According to these studies, the supply of selenium to domestic animals and the general population has declined.
For this reason, 10 grammes of selenium, rather than just six, are now being added to selenium fertilizers.
There is a known selenium deficiency in the soils in this country.
