This Blog AMICOR is a communication instrument of a group of friends primarily interested in health promotion, with a focus on cardiovascular diseases prevention.
To contact send a message to
achutti@gmail.com
http://achutti.blogspot.com
A palaeontologist examines a dinosaur fossil from the Triassic period (around 250 million to 200 million years ago) in Brazil.Credit: Carl de Souza/AFP via Getty
In December 2020, a paper in the journal Cretaceous Research sent shock waves through the palaeontology community1. It described a dinosaur species that the authors named Ubirajara jubatus — the first dinosaur found in the Southern Hemisphere to display what were probably precursors to modern feathers. The 110-million-year-old fossil had been collected in Brazil decades earlier — but no Brazilian palaeontologist had ever heard of it. The authors of the paper were from Germany, Mexico and the United Kingdom. /.../
#História Pessoal
Aproveitando o tema, colei acima uma foto nossa de 1951, durante uma aventura de escoteiro, escavamos o esqueleto de um fossil (Schafionix Fischeri) em Santa Maria, no bairro da Alemoa, onde no arenito do triássico econtravam-se muitos esqueletos e restos, como se fossem pedras esparsas pelo terreno. Na foto junto comigo e o espinhaço do saurio está a minha direita o saudoso Milton Schansis e a esquerda Chefe Gilberto, nosso lider na época. Clan Ibitory Retan, Chefe Geral Vitor Schuch, avô do atual Reitor da Universidade Federal de Santa Maria.
#Sermo
The Neurotransmitter oxytocin has long been touted as “the love hormone” because it is released during hugging, sexual activity, childbirth, and breast feeding. But a new study takes it a step further, and actually links oxytocin to overall life satisfaction.
According to the American Association for the Advancement of Science, “People whose brains release more of the neurochemical oxytocin are kinder to others and are more satisfied with their lives. This is the finding of new research, published in Frontiers in Behavioral Neuroscience, that also discovered that oxytocin release increases with age, showing why, on average, people are more caring as they get older.
(Clock illustration: Courtesy of Alex Cagan; Background graphic: TEK IMAGE/SCIENCE PHOTO LIBRARY via Getty Images)
Animals carry "mutational clocks" in their cells that dictate how quickly their DNA picks up mutations. And across species, animals tend to die once they've hit a certain number of mutations, new research finds.
It turns out that, in long-lived mammals like humans, these mutational clocks tick slower than they do in short-lived mammals like mice, meaning humans reach that threshold number of mutations at a later age than mice do. This discovery, the researchers said, could help solve a long-standing mystery in biology.
04/01/2022 · Nature Reviews Genetics is a monthly reviews journal in genetics and genomics. The journal publishes Comments, Reviews and Perspective articles written by experts in the field,
Secrets of the Moon’s Permanent Shadows Are Coming to Light
By JONATHAN O'CALLAGHAN
Robots are about to venture into the sunless depths of lunar craters to investigate ancient water ice trapped there, while remote studies find hints about how water arrives on rocky worlds.
Elegant Six-Page Proof Reveals the Emergence of Random Structure
By JORDANA CEPELEWICZ
Two young mathematicians have astonished their colleagues with a full proof of the Kahn-Kalai conjecture — a sweeping statement about how structure emerges in random sets and graphs.
Ancient Genes for Symbiosis Hint at Mitochondria’s Origins
By VERONIQUE GREENWOOD
Was the addition of mitochondria a first step in the formation of complex cells or one of the last? A new study of bacteria tries to answer this contentious question in evolutionary biology.
On Second Thought Our current standard unit of time, the second, is based on the cesium clock. But scientists are now planning to redefine it with optical atomic clocks, which have achieved far greater precision, as Alanna Mitchell reports for The New York Times. Optical clocks are sensitive to infinitesimal changes in their environment, even gravitational ones. In 2021 Katie McCormick wrote for Quanta about a clock that revealed gravity’s changing influence on time across a 1-mm cloud of atoms.
Explaining the Higgs Mechanism Symmetry dictates that the W-boson and other particles in the Standard Model should be massless. So why aren’t they? Matt O’Dowd explains for PBS Space Time how the Higgs mechanism gives things mass. The key to the Higgs mechanism is that an underlying symmetry of the laws of nature can be “spontaneously” broken by the state of a system, as physicist David Kaplan explained in a 2015 video for Quanta.
The immune system protects us from a full spectrum of pathogens, but without balance, it can end up hurting us over time, too. The immunologist Shruti Naik explains how our defenses can turn on us.
Vijay Balasubramanian investigates whether the fabric of the universe might be built from information, and what it means that physicists can even ask such a question.
In Sexy Worms, Inheritance Beyond Genes Can Help Evolution
By CARRIE ARNOLD
Experiments that showed a surprising persistence of sexiness in worms reveal how much we are still learning about the rules governing heritability, epigenetics and natural selection.
Which Computational Universe Do We Live In? Here Are Five Possibilities.
By ERICA KLARREICH
In 1995, the computer scientist Russell Impagliazzo described five possible worlds with ascending levels of cryptographic possibility. Any of these could be the world we live in.
Batting Average Supaporn Wacharapluesadee was the first scientist outside of China to sequence SARS-CoV-2. Jon Cohen writes for Science about her efforts to prevent the next pandemic by finding novel bat viruses before they spill over to humans. There is growing support for focusing more science on animal viruses as a way to anticipate and prevent spillover to humans. In 2020 Rodrigo Pérez Ortega wrote for Quanta on recent research into self-disseminating vaccines for wildlife.
Feeling Ghosted Neutrinos are perhaps the most puzzling particles in the Standard Model. Uncovering their mysteries could help us reveal the secrets of dark matter, too, as Jackson Ryan explains for CNET. Physicists think that several conflicting neutrino measurements could be resolved by introducing a new “dark sector” of particles. These particles might simultaneously explain dark matter and dark energy, Thomas Lewton wrote for Quanta in 2021.
Andrew Robinson’s pick of the top five science books to read this week includes an authoritative, coruscating analysis of artificial intelligence, a genetic history of inequality and an exploration of the use of electricity in medicine.
From the world’s smallest cat to spectacular hornbills plucking bats from the sky. This Earth Day explore the beauty and drama of our natural world with some of the most incredible natural history moments from BBC Earth!
