Sentences with phrase «insecticide ddt»

Exposure to the now - banned insecticide DDT, which washed into the ocean and contaminate their diet, caused bald eagles to die off — opening the skies over the islands for a new bird of prey to take hold.

New research, published this month in Environmental Health Perspectives, shows that persistent organic pollutants (POPs), including the insecticide DDT, travel in air and water currents around the world's -LSB-...]

Similarly, evolutionary biologists have known since Charles Darwin that natural selection eliminates inherited traits that reduce organisms» fitness, such as mosquitoes» susceptibility to the insecticide DDT.

A second consequence of the features of the food cycle is that when toxins such as the insecticide DDT get absorbed by plants, they get concentrated at each successive food level.

Not exact matches

Again, the widespread use of DDT and other insecticides affects the «balance of nature» in ways that make it necessary for us to be aware in advance of the consequences of their use.

Although increased worldwide travel and the rising popularity of second - hand goods may contribute to bedbugs» resurgence, the most likely reason is the rejection of DDT and other harsh chlorinated hydrocarbon insecticides

An earlier insecticide, DDT, played a major role in driving down malaria cases starting in the 1940s.

Bald eagles are still rebounding in the United States following the banning around 1970 of DDT, an insecticide that mimics hormones and caused a fatal weakening of eggshells.

Thirty - eight years after DDT was banned, Americans still consume trace amounts of the infamous insecticide every day, along with more than 20 other banned chemicals

While the main malaria vector in South Africa, Anopheles funestus, is susceptible to DDT, a secondary vector, A. arabiensis, has developed resistance to DDT and other insecticides.

«DDT resistance in Africa as well as several other parts of the world has been acquired because of massive use of these insecticides for crop protection,» Guillet says.

Given the fact that DDT does appear to be effective at fending off malaria mosquitoes in some places, its use would seem logical — but if applications do become more widespread, users may encounter a problem that Carson herself highlighted in Silent Spring: resistance to the insecticide by the Anopheles mosquitoes that transmit malaria, says Michael Fry.

In her landmark book, she documented a litany of evils observed after DDT and other organochlorine insecticides were sprayed on landscapes, rivers, and lawns: dead birds and paralyzed birds, pigeons dropping from the sky, bird nests without eggs and eggs that did not hatch, dead fish and fish swimming in circles, cancers in humans, and a buildup of DDT in the fat of animals and people.

In September the World Health Organization openly endorsed indoor spraying of DDT, saying it is not only the best weapon against malaria, it is also cheaper and more effective than other insecticides.

The bald eagle was nearly extinct in the continental U.S. by the late 20th century, but the population has since stabilized, primarily due to habitat protection and a ban on DDT, an insecticide that weakened the birds» eggs so much that the eagles could not produce viable offspring.

«Genetic secret of mosquito resistance to DDT, bed net insecticides discovered.»

Researchers from LSTM have found that a single genetic mutation causes resistance to DDT and pyrethroids (an insecticide class used in mosquito nets).

• 23 % DDT (organochlorine) First used as an insecticide in 1939.

However, when the scientists accounted for other factors known to influence concentrations — such as a mother» s age and how much fish she ate — the association was significant for only two chemicals: a byproduct of the insecticide lindane called beta - HCH and a DDT metabolite.

Yet the marine biologist's meticulously documented indictment of DDT led both to a U.S. ban on the insecticide and to the birth of the modern environmental movement.

In attempts to control this mosquito - borne killer, many countries still use DDT, spraying houses with the insecticide.

A widely used insecticide, DDT was banned in the United States in 1972 because it was building up in the environment.

«Everyone knew DDT was an extremely effective insecticide, but I was surprised by how long - lasting its effects were.

PCBs were used previously in for example coolants and electronic devices, while insecticides such as DDT are probably still in use in the area.

Methodology / principal findings: Population genetic structure was assessed through microsatellite analysis, and the impact of insecticide pressure by genotyping two target - site mutations, Vgsc - 1014F of the voltage-gated sodium channel target of pyrethroid and DDT insecticides, and Ace1 - 119S of the acetylcholinesterase gene, target of carbamate and organophosphate insecticides.

Anyway, DDT was banned in 1972, and replaced by the insecticide dieldrin, subsequently found to be so toxic it was outlawed in 1974.

Avoid pesticides: dieldrin (insecticide), DDT (insecticide), endosulfan (insecticide), heptachlor (insecticide), lindane / hexachlorocyclohexane (insecticide), atrazine (weedkiller), methoxychlor (insecticide).

Banned or restricted members of this flea insecticide group are DDT, DDE, Aldrin, Dieldrin, and Chlordane.

The bank funds could be used for expensive pyrethroid insecticides, but none could be used for DDT.

Ratcliffe associated bird kills and the raptor population decline to the cyclodiene insecticides and not DDT.

In the 1990s, several reports linked DDT to human cancers [3] and [4] and the insecticide was found in breast milk; [5] however, WHO continued to promote DDT use.

They are against chemicals that are safe such as DDT and other insecticides.

A notable precedent was the banning of DDT and other organophosphate insecticides under the Stockholm Convention, due to unacceptable ecological impacts.

Pelican populations are doing well now, but they had a close call with the introduction of insecticides like DDT to the ecosystem — their numbers dwindled dangerously low and they were listed as endangered in 1970.

Although numbers were dramatically reduced after World War II, the parasites have made a comeback thanks to increased global travel, regulatory restrictions on insecticides like DDT, and tolerance to newer, organic bed bug treatments, according to researchers at the Eleanor Mann School of Nursing at the University of Arkansas in Fayetteville.