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Brightsurf
Em 2026: 114 notícias
Desde 1995: 427 notícias
Bactericidal action of violacein revealed
Publicado em 26 de abril de 2019
In an article published in the journal ACS Infectious Diseases , Brazilian researchers describe the bactericidal action mechanism of violacein, a violet pigment produced by environmental bacteria, especially Chromobacterium violaceum.
According to the authors of the study, the substance targets the cytoplasmic membrane of bacteria, mainly affecting gram-positive bacteria such as those of the genera Streptococcus, Enterococcus and Listeria. Its various biological activities include the capacity [...]
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Study shows the potential of carbon nanotubes to cool electronic circuits
Publicado em 24 abril 2019The use of solid-state refrigerators to cool appliances and electronic devices is a possible technological application for a theoretical study conducted at the University of Campinas (UNICAMP) in São Paulo State, Brazil. Although this application is not contemplated by the study, which was based on computer simulations, such applications are on the horizon and could be an efficient and environmentally friendly alternative to vapor-compression refrigerators, which currently dominate the [...]ver notícia -
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 -
Study highlights anti-tumor activity of curcumin on stomach cancer
Publicado em 22 abril 2019Curcumin is widely used to impart color and flavor to food, but scientists have discovered that this yellow powder derived from the roots of the turmeric plant ( Curcuma longa) can also help prevent or combat stomach cancer. The study by researchers at the Federal University of São Paulo (UNIFESP) and the Federal University of Pará (UFPA) in Brazil identified possible therapeutic effects of this pigment and of other bioactive compounds found in food on stomach cancer, the third [...]ver notícia -
Late dinner and no breakfast is a killer combination
Publicado em 18 abril 2019People who skip breakfast and eat dinner near bedtime have worse outcomes after a heart attack. That's the finding of research published today in the European Journal of Preventive Cardiology, a journal of the European Society of Cardiology (ESC).1 The study found that people with the two eating habits had a four to five times higher likelihood of death, another heart attack, or angina (chest pain) within 30 days after hospital discharge for heart attack. This was the first study to [...]ver notícia -
The Cerrado once connected the Andes with the Atlantic Rainforest
Publicado em 17 abril 2019The tropical forests of the Andes and Brazil's Atlantic Rainforest biome are separated by almost 1,000 km of drier areas with open vegetation in the Chaco, Cerrado (Brazilian savanna), and Caatinga (Brazilian semiarid) biomes. Today, these tropical forests are not connected, but the fact that they share closely related species and lineages suggests that these biomes were connected in the past. For example, 23 rainforest bird species have been found in both the Andean and Atlantic tropical [...]ver notícia -
Growth hormone acts to prevent weight loss
Publicado em 12 abril 2019Researchers at the University of São Paulo (USP) in Brazil have discovered that growth hormone (GH), which stimulates skeletal maturation and linear bone growth, as well as helping maintain tissue and organs throughout life, also acts directly on the brain to conserve energy when the body loses weight. A paper on the discovery has just been published in the journal Nature Communications. "Growth hormone has been known for decades, but our discovery shows it does a lot more than was thought," [...]ver notícia -
Biophotonic therapy eliminates bacteria and viruses from organs before transplantation
Publicado em 11 abril 2019A new technique for the decontamination of organs before transplantation using ultraviolet and red light irradiation has been developed by Brazilian and Canadian researchers and is described in an article published in the journal Nature Communications. The research is supported by São Paulo Research Foundation - FAPESP and has been partially conducted at the Optics and Photonics Research Center (CEPOF ), hosted by the University of São Paulo (USP) at São Carlos in São Paulo State [...]ver notícia -
Astronomers find evidence of a planet with a mass almost 13 times that of Jupiter
Publicado em 08 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 04 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