Manganese
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Manganese is a chemical element. It is a grey whitish metal that is very hard yet is also very brittle. It was used in paints even back in what we term "prehistoric times" and traces of it have been found in paints that date back 17,000 years.
As to who actually "discovered" manganese back in the seventeenth and eighteenth centuries, well, there's some dispute over that with credit being given to several different scientists, probably all deserving of that credit. Johann Rudolf Glauber, a self taught German chemist, who, although he received no formal education, is often referred to and considered to be a forerunner of modern chemistry, was the first to produce a form of manganese called permanganate, which is a useful chemical tool often found in a laboratory. This form of manganese was later rediscovered over a hundred years later in 1770 by another chemist, Ignitas Kaim. A German chemist, Carl Wilhelm Scheele, was the first person to realize that manganese was an element and his fellow worker and friend, Johan Gottlieb Gahn, was the first person known to ever actually succeed in isolating the element, when he did so in 1774.
Manganese has been found to be an essential trace element in all forms of life. Manganese is listed on OSHA's Hazardous Substance List, because of its high level of toxicity.
Some medical doctors and other professional health care experts have indicated that they feel that an extensive study which was carried out recently seems to indicate that manganese inhalation seemed to have a direct connection with some sort of central nervous system toxicity in rats. Some medical doctors and other professional health care experts are also considering and studying into the possibility that long term exposure to shower water which contains naturally occurring manganese puts some 8.7 million Americans at risk for potential danger to their nervous systems. One form of Parkinson's Disease neurodegeneration which has been named "manganism" has been shown since the early nineteenth century to be directly connected to being exposed to manganese.
Some medical doctors and other professional health care workers have claimed that there is a connection welding and inhaling manganese.
On a more positive side, some medical doctors and professional health care workers feel that studies indicate that manganese also can effectively be used in medicine as a disinfectant.
Good food sources of manganese are tea, grain, rice and nuts. A manganese deficiency can result in improper growth, various kinds of birth defects in the skeleton of a newborn child or skeletal abnormalities as the person grows. People who are constantly exposed to manganese, possibly because of the nature of their work, have been noted to exhibit such things as weakness, anorexia, muscle pains, apathy, slowness of speech without any inflection, "mask like" facial expressions which seem to be completely without signs of any emotions and slow, clumsy movements of their limbs. Some medical doctors and other health care experts have stated that studies seem to indicate that these symptoms, once acquired, seem to be irreversible.
