About 10,000 light years away from Earth, a black hole is engaged in a stellar feast, devouring the gases of a nearby star.
A stellar meal provides tantalizing new evidence about black hole evolution.
Continue reading “NASA telescope spots black hole shrinking after devouring a star” »
And there will be increasing pressures to continue this research. We may need to accelerate the evolution of terrestrial life forms, for example, including homo sapiens, so that they carry traits and capabilities needed for life in space or even on our own changing planet.
All of this will bring up serious issues as to how we see ourselves – and behave – as a species. While the creation of multicellular organisms that are capable of sexual reproduction is still a long way off, in 2019 we will need to begin a serious debate about whether artificially evolved humans are our future, and if we should put an end to these experiments before it is too late.
A team of scientists has developed a method that yields, for the first time, visualization of a gene amplifications and deletions known as copy number variants in single cells.
Significantly, the breakthrough, reported in the journal PLoS Biology, allows early detection of rare genetic events providing high resolution analysis of the tempo of evolution. The method may provide a new way of studying mutations in pathogens and human cancers.
“Evolution and disease are driven by mutational events in DNA,” explains David Gresham, an associate professor in New York University’s Department of Biology and the study’s senior author. “However, in populations of cells these events currently cannot be identified until many cells contain the same mutation. Our method detects these rare events right after they have happened, allowing us to follow their trajectory as the population evolves.”
Continue reading “Scientists develop method to visualize a genetic mutation” »
‘’But they noticed an unrealistic defect in the calculations that had traditionally been used in models to validate the KTW idea: They “described populations as if individuals did not exist. It’s as if we described a liquid without acknowledging atoms,” Goldenfeld explained by email.’’
Modelers find evidence that a combination of competition, predation and evolution will push ecosystems toward species diversity anywhere in the universe.
Populations of indigenous people in southern Africa carry a gene that causes lighter skin, and scientists have now identified the rapid evolution of this gene in recent human history.
The gene that causes lighter skin pigmentation, SLC24A5, was introduced from eastern African to southern African populations just 2,000 years ago. Strong positive selection caused this gene to rise in frequency among some KhoeSan populations.
UC Davis anthropologist Brenna Henn and colleagues have shown that a gene for lighter skin spread rapidly among people in southern Africa in the last 2,000 years.
Neoliberalism slows down evolution! Just kidding…or am I? 🧐😁🤣🙈.
Like other organisms, bacteria constantly have to fight to survive in hostile living conditions. Together with colleagues in Finland, researchers at the Max Planck Institute for Evolutionary Biology in Plön have discovered that bacteria adapt to their environment more slowly and less efficiently as soon as they are exposed to two stress factors rather than one. This is due to mutations in different genes. The slower rate of evolution led to smaller population sizes. This means that evolution can take divergent paths if an organism is exposed to several stress factors.
Bacteria rarely live alone; they are usually part of a community of species that is exposed to various stress factors. They can often react to these factors by adapting to new environmental conditions with astonishing speed. Antibiotics that enter soil and water via waste water and accumulate there in low concentrations can trigger the evolution of resistance in bacteria – even though these concentrations are so low that they inhibit bacterial growth only slightly or not at all. However, bacteria do not only have to fight antibiotics; they also have to deal with predators. This is why they often grow in large colonies that cannot be consumed by predatory organisms.
What would it be like to live through our own species’ evolution? The biological process of natural selection that gave rise to every species on Earth takes hundreds of generations to turn one species into another, but what if that process could be skipped entirely?
A look at the future of transhumanist technologies and what their evolution will mean for our society.
Continue reading “The Transhuman Revolution: What it is and How to Prepare for its Arrival” »
I just love it when the reductionists are wrong…again. I can not help myself. bigsmile
University of Nebraska-Lincoln researchers have found revolutionary evidence that an evolutionary phenomenon at work in complex organisms is at play in their single-celled counterparts, too.
Species most often evolve through DNA mutations inherited by successive generations. A few decades ago, researchers began discovering that multicellular species can also evolve through epigenetics: traits originating from the inheritance of cellular proteins that control access to an organism’s DNA, rather than genetic changes.
Continue reading “Evolution sans mutation discovered in single-celled archaea” »
Over the past 90 years, scientists have discovered hundreds of antibiotics—microbe-killing drugs that have brought many pernicious diseases to heel. But every time researchers identify a new drug, bacteria inevitably evolve to resist it within a matter of years. We thrust; they parry. Now, with the flow of new antibiotics having dried up for decades, our stalemated duel with infectious bacteria threatens to end in outright defeat. Superbugs are ascendant around the world, including those that resist all commonly used drugs.
Scientists have pinpointed a molecule that accelerates the evolution of drug-resistant microbes. Now they’re trying to find a way to block it.
