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In a paper published in 1894, it was formally proposed to add chlorine to water to render it "germ-free". Two other authorities endorsed this proposal and published it in many other papers in 1895. [4] Early attempts at implementing water chlorination at a water treatment plant were made in 1893 in Hamburg, Germany.
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Ultraviolet treatment was seen as the least risky way to control such microorganisms and avoid higher levels of chlorination, which can lead to unintended health effects. [15] The UV facility opened on October 8, 2013, and was built at a cost of $1.6 billion. [18]
The UV technology effectively controls microorganisms such as giardia and cryptosporidium which are resistant to chlorine treatment. [5] The city staff determined that the cheapest alternatives to a UV system would cost over $3 billion. In response to this finding, Bloomberg decided to set up a public competitive contract auction.
Just like humans, nutrition is important for our friends in the animal kingdom. Helping them grow and develop properly, the right diet can help our pets stay healthy.
Epibatidine was discovered by John W. Daly in 1974. It was isolated from the skin of Epipedobates anthonyi frogs collected by Daly and colleague, Charles Myers. Between 1974 and 1979, Daly and Myers collected the skins of nearly 3000 frogs from various sites in Ecuador, after finding that a small injection of a preparation from their skin caused analgesic (painkilling) effects in mice that ...