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ScienceDaily (EUA)
Em 2026: 31 notícias
Desde 1995: 245 notícias
Set in amber, fossil ants help reconstruct evolution of fungus farming
Publicado em 01 de outubro de 2018
Date: October 1, 2018
Source: University of Wisconsin-Madison
Summary: A new study makes it clear that the constant threat of crop parasites repeatedly pushed evolution in strikingly similar directions in ants, creating structures that helped the ants reinforce their partnership with bacteria.
Some 50 million years before humans figured it out, agriculture arrived in the world in a seemingly unlikely place: an ant hill.
Eschewing wheat or rice for feathery white fungus, the ants cultivated [...]
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Physical exercise improves the elimination of toxic proteins from muscles
Publicado em 27 setembro 2018Date: September 27, 2018 Source: Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: A new study could contribute to the development of alternatives to treat muscle weakness and atrophy. An article describes how rats subjected to an aerobic exercise routine preserved their muscle's contractility properties and their autophagic system's memory even after having a sciatic nerve injury induced. A study published in Scientific Reports by researchers at the University of São Paulo [...]ver notícia -
Four extremely young asteroid families identified
Publicado em 24 setembro 2018Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: Researchers dated the families using a numerical simulation method to process current data to go back in time to the asteroid formation era. FULL STORY Four families of extremely young asteroids have been identified by researchers affiliated with São Paulo State University (UNESP) in Guaratinguetá, Brazil. An article on the discovery has been published in Monthly Notices of the Royal Astronomical [...]ver notícia -
Jararaca pit vipers: Giant' specimens proliferation linked to fewer predators
Publicado em 18 setembro 2018Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: In São Paulo, Brazil, it is the lesser presence of predators, not large food supply, that can explain why an isolated green area concentrates more giant pit vipers than a wide forest reserve. FULL STORY In São Paulo, Brazil's largest city, it is easier to find "giant" jararaca pit vipers (Bothrops jararaca) in a small fragment of Atlantic Rainforest surrounded by urban sprawl than in a nature reserve that is 16 times [...]ver notícia -
Trees reveal the evolution of environmental pollution
Publicado em 13 setembro 2018Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: Chemical analysis of tipuana tree rings and bark by Brazilian researchers shows falling levels of heavy metal pollution in the air of São Paulo City, Southern Hemisphere's largest metropolis. Share: FULL STORY The chemical composition of the tree's growth rings reflects the levels of heavy metals in the soil year by year. Credit: Giuliano Maselli Locosselli The chemical composition of the tree's growth rings reflects the [...]ver notícia -
Climate change may drive 10 percent of amphibian species in the Atlantic Rainforest to extinction
Publicado em 12 setembro 2018Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: Climate conditions forecast for 2050 and 2070 will be potentially lethal to species less adapted to climate variation, according to Brazilian researchers. Share: FULL STORY Global warming could lead to the extinction of up to 10% of frog and toad species endemic to Brazil's Atlantic Rainforest biome within about the next 50 years. The temperature and precipitation regimes predicted to occur between 2050 and 2070 will be [...]ver notícia -
Bees coordinate strategy for defending colony
Publicado em 05 setembro 2018Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: Stingless bees position hovering guards in an organized manner at nest entrance to detect and intercept intruders rapidly. The Brazilian stingless bee Tetragonisca angustula (jataí in Portuguese) deploys a different strategy for defending its nests from other social insect species. In addition to posting sentinels at the nest entrance, as do most social insects, colonies of this species also have guards that hover near the [...]ver notícia -
Coastal strip in Brazil sheds new light on early farming
Publicado em 05 setembro 2018University of York Summary: Humans may have been cultivating plants on a narrow coastal strip in Brazil as far back as 4,800 years ago, according to a new study. advertisement An international team of scientists, led by researchers at the University of York, analysed the teeth and bones of ancient human remains found at the site in Southern Brazil. The results reveal that the individuals, who lived around 4,800 years ago, were eating a diet rich in carbohydrates, suggesting that they may [...]ver notícia -
In test with rats, cannabidiol showed sustained effects against depression for seven days
Publicado em 30 agosto 2018Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: First results appeared 24h after one single dose of the marijuana component; scientists concluded that CBD activate mechanisms which repair neuronal circuitry in patients' prefrontal cortex and hippocampus. Share: FULL STORY Commercial antidepressants typically take two to four weeks to have a significant effect on a depressed patient. They are also inneffective in approximately 40% of the cases. Finding new drugs for [...]ver notícia -
New phase proposed in the relationship between figs and wasps
Publicado em 28 agosto 2018Fundação de Amparo à Pesquisa do Estado de São Paulo Summary: A researcher describes 129 species of fig tree parasites which compete and even prey upon the fig wasps during the many phases of the fig-wasp mutualism that helped to shape both plant and its pollinator. Share: FULL STORY An example of "fallen fig fauna": a beetle larvae which feeds on the fig from the inside, then migrate to the soil when the ripe fruit falls to the ground. Credit: Luciano Palmieri An example of "fallen [...]ver notícia