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A 50% rise in the level of CO2 could reduce rainfall in the Amazon more than deforestation
Publicado em 30 junho 2021
Simulations show that the direct impact of rising levels of carbon dioxide over the Amazon rainforest would be a reduction in rainfall equivalent to or even greater than the impact of complete substitution of the forest by pasture
A 50% rise in the level of carbon dioxide (CO 2) in the atmosphere could reduce rainfall in the Amazon as much as or even more than substitution of the entire forest by pasture. The rise in CO 2 would reduce the amount of water vapor emitted by the forest, leading to [...]
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Poaching affects behavior of endangered capuchin monkeys in Brazilian biological reserve
Publicado em 21 junho 2021A study conducted in the Una Biological Reserve in the state of Bahia, Brazil, shows that in a habitat with high hunting pressure the risk of predation has such a significant impact on the behavior of the Yellow-breasted capuchin monkey Sapajus xanthosternos that it even avoids areas offering an abundant supply of plant biomass and invertebrates, its main sources of food. An article reporting the findings of the study is published in the American Journal of [...]ver notícia -
Study shows how fungi and bacteria can activate genes associated with head and neck cancer
Publicado em 25 maio 2021An in vitro study conducted by a group of researchers at São Paulo State University (UNESP) in Araraquara, Brazil, shows how fungi and bacteria can activate genes associated with head and neck tumors, as the metabolism of biofilms (communities in which these microorganisms self-organize in a structured and coordinated manner) stimulate tumor cells by favoring the cell signaling pathways required for tumor development and resistance to treatment. The findings include entirely novel [...]ver notícia -
The formation of the Amazon Basin influenced the distribution of manatees
Publicado em 10 maio 2021Whole mitochondrial DNA sequencing of the three extant species of the aquatic mammal shows that they first split from their common ancestor after geological events isolated the South American region from the sea All three species of manatee now present on Earth share a common ancestor from which they split some 6.5 million years ago, when a huge lake in Amazonia, then linked to the Caribbean, was cut off from the sea. The African manatee Trichechus senegalensis is not as genetically close to [...]ver notícia -
Higher Handgrip Cutoff Values Found To Be More Accurate Markers Of Mobility Limitation In Older Adults
Publicado em 19 abril 2021Aging entails a loss of muscle mass and strength, which in some cases impairs mobility, hinders walking or performance of day-to-day tasks, and exposes the elderly to the risk of falls and hospitalizations. Source linkver notícia -
Microorganisms On The Rio Grande Rise Are A Basis For Life And A Possible Origin Of Metals
Publicado em 16 abril 2021Researchers conducted the first large-scale survey of the microbiota present in the seamount’s ferromanganese crusts, describing bacteria and archaea involved in the nutrient cycle and formation of metals The abundant biological and mineral diversity of the Rio Grande Rise, a seamount in the depths of the Atlantic Ocean about 1,500 km from the coast of Brazil, is probably due to a great extent to little-known microscopic creatures. Researchers affiliated with the University of [...]ver notícia -
Researchers develop a technique to produce transplantable livers in the laboratory
Publicado em 05 abril 2021Researchers at the Human Genome and Stem Cell Research Center (HUG-CELL), hosted by the University of São Paulo’s Institute of Biosciences (IB-USP) in Brazil, have developed a technique to reconstruct and produce livers in the laboratory. The proof-of-concept study was conducted with rat livers. In the next stage of their research, the scientists will adapt the technique for the production of human livers in order in future to increase the supply of these organs for [...]ver notícia -
Use of perovskite will be a key feature of the next generation of electronic appliances
Publicado em 13 março 2021Nanomaterials of perovskite dispersed in hexane and irradiated by laser; light emission by these materials is intense thanks to resistance to surface defects Quantum dots are manmade nanoparticles of semiconducting material comprising only a few thousand atoms. Because of the small number of atoms, a quantum dot’s properties lie between those of single atoms or molecules and bulk material with a huge number of atoms. By changing the nanoparticles’ size and shape, it is possible to [...]ver notícia