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ScienceBlog
Em 2026: 5 notícias
Desde 1995: 87 notícias
Researchers ID genes linked to sex differentiation in giant Amazon fish
Publicado em 25 de junho de 2019
Brazilian and German scientists have completed a collaborative project to sequence and analyze the whole genome of Arapaima gigas, a giant freshwater fish known in Brazil as pirarucu and elsewhere as arapaima or paiche. Its growth rate is the fastest among known freshwater fish species. Its natural distribution covers most of the Amazon River basin in Peru and Brazil.
The research led to discoveries that help determine sex at an early stage, facilitating the separation of female and male fry [...]
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Simple sea anemones not so simple after all
Publicado em 23 abril 2019COLUMBUS, Ohio - The tube-dwelling anemone is an ancient sea creature that resembles a prehistoric flower. The animals live slow, long and predictable lifestyles and look fairly similar from species to species. It'd be easy to use the word "simple" when considering this relative of coral and jellyfish. But wait - not so fast. New research on tube anemones is challenging everything that evolutionary biologists thought they knew about sea animal genetics. The mitochondrial DNA of [...]ver notícia -
Astronomers Find Evidence Of A Planet With A Mass Almost 13 Times That Of Jupiter
Publicado em 09 abril 2019In the past three decades, almost 4,000 planet-like objects have been discovered orbiting isolated stars outside the Solar System (exoplanets). Beginning in 2011, it was possible to use NASA’s Kepler Space Telescope to observe the first exoplanets in orbit around young binary systems of two live stars with hydrogen still burning in their core. Brazilian astronomers have now found the first evidence of the existence of an exoplanet orbiting an older or more evolved binary in which one of the [...]ver notícia -
Compound that kills drug-resistant fungi is isolated from ant microbiota
Publicado em 05 abril 2019Antimicrobial and antifungal resistance, which describe the ability of bacteria and other pathogens to resist the effects of drugs to which they were once sensitive, is a major public health problem worldwide. A study published recently in the journal Nature Communications suggests that the solution may come from the tiny bodies of insects, or more accurately, from the microbiota that they host. This innovative hypothesis was first proposed by Brazilian and US researchers as part of a [...]ver notícia -
Giant animals lived in Amazonian mega-wetland
Publicado em 26 fevereiro 2019A land of giants. This is the best definition for Lake Pebas, a mega-wetland that existed in western Amazonia during the Miocene Epoch, which lasted from 23 million to 5.3 million years ago.ver notícia -
Found in fruit, rutin helps combat the effects of jararaca viper venom
Publicado em 09 janeiro 2019Rutin, a bioflavonoid (plant pigment) found in certain vegetables and fruits, protects mice against snake venom by minimizing bleeding and inflammation, according to a study performed at the Butantan Institute, a research institution belonging to the government of São Paulo State in Brazil. The research focused on methods to combat the effects of envenomation by the lancehead pit viper Bothrops jararaca, which is responsible for approximately 70% of snakebites in the state, and was conducted [...]ver notícia -
Scientists synthesize molecule capable of eliminating hepatitis C virus
Publicado em 19 dezembro 2018A new compound that inhibits the replication of hepatitis C virus (HCV) in several stages of its lifecycle – and is also capable of acting on bacteria, fungi and cancer cells – has been synthesized by researchers at São Paulo State University (UNESP) in Brazil. The study was supported by São Paulo Research Foundation – FAPESP via several research projects [see list below] and described in an article published in Scientific Reports, an online journal owned by Springer Nature. “What [...]ver notícia -
Ancient DNA from Central, South America reveal genetic exchanges, population turnover
Publicado em 12 novembro 2018An international team of researchers has revealed unexpected details about the peopling of Central and South America by studying the first high-quality ancient DNA data from those regions. The findings include two previously unknown genetic exchanges between North and South America, one of which represents a continent-wide population turnover. The results suggest that the people who spread the Clovis culture, the first widespread archaeological culture of North America, had a major [...]ver notícia -
The new face of South American people
Publicado em 10 novembro 2018The history of the peopling of the Americas has just been interpreted afresh. The largest and most comprehensive study ever conducted on the basis of fossil DNA extracted from ancient human remains found on the continent has confirmed the existence of a single ancestral population for all Amerindian ethnic groups, past and present. Over 17,000 years ago this original contingent crossed the Bering Strait from Siberia to Alaska and began peopling the New World. Fossil DNA shows an affinity [...]ver notícia -
Study On Jararaca Pit Vipers Links ‘Giant’ Specimens Proliferation To Predators
Publicado em 19 setembro 2018In 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 larger, even though more food is available for snakes in the latter. A new study suggests that the difference may be due to the number of predators in each habitat and not to the availability of food, as the researchers supposed at the outset. Their findings have been [...]ver notícia