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Selenium deficiency occurs when an organism lacks the required levels of selenium, a critical nutrient in many species.Deficiency, although relatively rare in healthy well-nourished individuals, [1] can have significant negative results, [2] affecting the health of the heart and the nervous system; contributing to depression, anxiety, and dementia; and interfering with reproduction and gestation.
Although New Zealand soil has low levels of selenium, the residents have not detected adverse health effects. [ 149 ] Selenium deficiency, defined by low (<60% of normal) selenoenzyme activity levels in brain and endocrine tissues, occurs only when a low selenium level is linked with additional stress, such as high exposures to mercury [ 150 ...
Selenium deficiency as defined by low (<60% of normal) selenoenzyme activity levels in brain and endocrine tissues only occurs when a low selenium status is linked with an additional stress, such as high exposures to mercury [27] or as a result of increased oxidant stress due to vitamin E deficiency.
Selenium is, however, an essential mineral element for animal (including human) nutrition and selenium deficiencies are known to occur when food or animal feed is grown on selenium-deficient soils. The use of inorganic selenium fertilizers can increase selenium concentrations in edible crops and animal diets thereby improving animal health. [31]
Selenium deficiency: Significant negative results, [29] affecting the health of the heart, Keshan disease and the nervous system; contributing to depression, anxiety, and dementia; and interfering with reproduction and gestation. People dependent on food grown from selenium-deficient soil may be at risk for deficiency. [30] Sodium deficiency
Micronutrient deficiency is defined as the sustained insufficient supply of vitamins and minerals needed for growth and development, as well as to maintain optimal health. Since some of these compounds are considered essentials (we need to obtain them from the diet), micronutrient deficiencies are often the result of an inadequate intake.
iodine deficiency / iodism (hyperthyroidism [31]) Molybdenum: 0.045 2; 0.6 Required for the functioning of xanthine oxidase, aldehyde oxidase, and sulfite oxidase [32] Legumes, whole grains, nuts [29] molybdenum deficiency / molybdenum toxicity [33] Selenium: 0.055 0.4; 0.3 Essential to activity of antioxidant enzymes like glutathione peroxidase
Nutrients in the soil are taken up by the plant through its roots, and in particular its root hairs.To be taken up by a plant, a nutrient element must be located near the root surface; however, the supply of nutrients in contact with the root is rapidly depleted within a distance of ca. 2 mm. [14] There are three basic mechanisms whereby nutrient ions dissolved in the soil solution are brought ...