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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.
Shelter-in-place recommendations and evacuation orders have been lifted Monday after a fire at a Georgia industrial plant caused a chemical reaction that prompted around 17,000 people to evacuate ...
Chloramination is the treatment of drinking water with a chloramine disinfectant. [1] Both chlorine and small amounts of ammonia are added to the water one at a time which react together to form chloramine (also called combined chlorine), a long lasting disinfectant. Chloramine disinfection is used in both small and large water treatment plants.
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 ...
Two distinct and separate methods are employed in the sanitation of a swimming pool. The filtration system removes organic waste on a daily basis by using the sieve baskets inside the skimmer and circulation pump and the sand unit with a backwash facility for easy removal of organic waste from the water circulation.
It is commonly used as a stand-alone treatment or in combination / co-formulation with methyl bromide and 1,3-dichloropropene. [12] [13] Chloropicrin is used as an indicator and repellent when fumigating residences for insects with sulfuryl fluoride which is an odorless gas. [citation needed] Chloropicrin's mode of action is unknown [14] (IRAC ...
As of 2010, the IUCN Red List, which incorporates the Global Amphibian Assessment and subsequent updates, lists 650 amphibian species as "Critically Endangered", and 35 as "Extinct". [4] Despite the high risk this group faces, recent evidence suggests the public is growing largely indifferent to this and other environmental problems, posing ...
The spring peeper is a tan or brown frog with a dark cross on its dorsa (thus the Latin name crucifer, meaning cross-bearer [7]), though sometimes the marking may be indistinct. [ 8 ] [ 9 ] Dark lines can also be found between the eyes and in a crossband on the hindlimbs of P. crucifer . [ 10 ]