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Wat for I learn Chemistry

2010-February-15

Cugir 1900Good Chemistry for Some Household Sprays

a company that has made nontoxic cleaners for more than 20 years, is rolling out its first collection of disinfecting products made with thymol, a component of the oil derived from thyme. The products — wipes, a multisurface spray and a bathroom spray — kill germs (including viruses like Influenza A and H1N1) just like other disinfectants but are safe enough that the Environmental Protection Agency allows them to be sold without lengthy first-aid warnings on the labels.

Perhaps the biggest game-changer, though, is Martha Stewart’s first line of cleaning products, which have no added fragrances or artificial colors. Although many Americans have grown to like and even favor products that smell like chemicals or have artificial scents, Ms. Stewart said she wants consumers “to break that habit,” and trust that the absence of a smell can indicate clean. “If you can start eliminating some of the harshness that surrounds us on our planet and get back to nature, that’s what I’m all about,” she said, explaining that she had to “fight against focus groups” to get the products made the way she wanted.

DDT story

DT’s insecticidal properties were not discovered until 1939, and it was used with great success in the second half of World War II to control malaria and typhusamong civilians and troops. The Swiss chemist Paul Hermann Müller was awarded the Nobel Prize in Physiology or Medicine in 1948 “for his discovery of the high efficiency of DDT as a contact poison against several arthropods.”[2] After the war, DDT was made available for use as an agricultural insecticide, and soon its production and use skyrocketed.[3]

In 1962, Silent Spring by American biologist Rachel Carson was published. The book catalogued the environmental impacts of the indiscriminate spraying of DDT in the US and questioned the logic of releasing large amounts of chemicals into the environment without fully understanding their effects on ecology or human health. The book suggested that DDT and other pesticides may cause cancer and that their agricultural use was a threat to wildlife, particularly birds. Its publication was one of the signature events in the birth of the environmental movement, and resulted in a large public outcry that eventually led to DDT being banned in the US in 1972.

Thymol molecule is look like half of DDT molecule and have that structure may cause cancer

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