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An international group of researchers with several Brazilian participants discovered that Quaoar, one of the large objects orbiting beyond Neptune, has a ring. The finding suggests that these structures must be much more common than previously imagined and calls into question the understanding of the conditions that allow them to form. Quaoar is one of the known large objects that reside in the so-called Kuiper belt, where Pluto, the largest of them, is also located. At an estimated 1,110 km [...]

Quaoar’s small and faint rings are unique An international team of astronomers has discovered a new, previously unknown system of rings in the outer reaches of our solar system around Quaoar, a distant dwarf planet smaller than Pluto that was discovered in 2002 and orbits the Sun beyond from Poseidon. Quaoar’s small and faint rings are unique in that they orbit it at a much greater distance than the rings around Saturn, something that has so far not been satisfactorily [...]

From the 1980s onwards, a marine animal popularly known as sun coral (Tubastraea tagusensis) began to be observed off the Brazilian coast, anchored on oil platforms in the Campos Basin, in Rio de Janeiro. Today, this invasive species, originally from the Indo-Pacific, has already spread over more than 3,500 km of the Brazilian coast and is considered a threat to biological diversity because it destroys other coral species, reproduces quickly and does not have a natural predator. . When [...]

One of the most lethal types of tumor is glioblastoma, as few drugs are effective in combating this misaligned growth of glial cells, which make up brain tissue. The current standard of care is surgical removal of the tumor, followed by temozolomide chemotherapy, radiotherapy, and nitrosoureas (such as lomustine). Although there has been some improvement in patient survival over the years, the poor prognosis remains, as these tumor cells have a very high capacity to resist existing drugs and [...]

Mining in indigenous lands in the Legal Amazon has increased by 1,217% in the last 35 years, jumping from 7.45 square kilometers (km2) occupied by this activity in 1985 to 102.16 km2 in 2020. Almost all (95%) of these mining areas Illegal mining is concentrated in three indigenous lands: Kayapó, followed by Munduruku and Yanomami. The data are from a study carried out by researchers from the National Institute for Space Research (Inpe) and the University of South Alabama, in the [...]

The largest and most comprehensive meta-analysis ever conducted to date on the effects of the Zika virus on children of women infected during pregnancy was published in The Lancet Regional Health – Americas. Based on 13 national studies that gather data from 1,548 pregnant women, the article reaches robust conclusions, such as that almost a third of children present some abnormality as a result of the infection and 4% manifest microcephaly itself. With this, it lays the foundations for [...]

Results of a study carried out with 286 volunteers during a Covid-19 outbreak reinforce the importance of the third dose of the vaccine for protection against SARS-CoV-2, including the omicron variant of the virus. The work, published in the Journal of Medical Virology, also shows that those vaccinated with three doses had more antibodies capable of neutralizing the coronavirus than volunteers who had not completed the vaccination schedule or even those who had previously had the disease. [...]

The link between Covid-19 symptoms and physical inactivity is becoming increasingly evident. In a study recently published in the journal Scientific Reports, researchers from the University of São Paulo (USP) point out that patients with at least one persistent symptom of the coronavirus infection have a 57% greater risk of being sedentary. That number grows to 138% among those reporting five or more “post-acute SARS-CoV-2 sequelae,” as the researchers put [...]

A study published in the Journal of Proteome Research by researchers from the Federal University of São Paulo (Unifesp) and the Butantan Institute, in addition to partners in Brazil and the United States, characterized for the first time the venom of the tarantula Acanthoscurria juruenicola , a species native to the Amazon. Some of the toxins found have potential for the development of drugs and even biological insecticides. “In 2023, the description of this species will [...]