Lake turnover occurs when there is a drastic change in weather and is commonly noted with the very hot water in the summer begins to cool in the spring. ... Lake turnover occurs when there is a drastic change in weather and is commonly noted with the very hot water in the summer begins to cool in the spring.
Selenium and iodine: thyroidâs natural partners. The problems which selenium deficiency can cause are made more serious when another key nutrient, iodine, is low as well. Iodine is a nutrient that is much better known for its role in thyroid health. Selenium is crucial in aiding the body to recycle iodine.
Selenium occurs in minerals such as eucairite (CuAgSe), crooksite (CuThSe) and clausthalite (PbSe), but these minerals are too rare to use as a major source of selenium. Today, most selenium is obtained as a byproduct of refining copper. Selenium's resistance to the flow of electricity is greatly affected by the amount of light shining on it. The brighter the light, the better selenium conducts electricity. This property has made selenium useful in devices that respond to the intensity of light, such as electric eyes, photo cells, light meters for cameras and copiers. Selenium can also produce electricity directly from sunlight and is used in solar cells.