Dormant desert life hints at possibilities on Mars
Dormant desert life hints at possibilities on Mars
The desert, which spans parts of Chile and Peru, is the driest non-polar desert on Earth and may contain the environment most like that of the Red Planet, said the report in the Proceedings of the National Academy of Sciences.
Lead researcher Dirk Schulze-Makuch, a professor and planetary scientist at the Technical University of Berlin, and colleagues took a trip to the desert in 2015 to learn more about what kind of life might exist there. Then, unexpectedly, it rained.
Scientists detected an explosion of biological activity in the soil, and quickly began using sterile spoons to scoop up samples.
Genomic analyzes helped identify the several apparently indigenous species of microbial life — mostly bacteria — that had somehow adapted to live in the harsh environment by lying dormant for years, then re-animating and reproducing once it rained.
“In the past, researchers have found dying organisms near the surface and remnants of DNA, but this is really the first time that anyone has been able to identify a persistent form of life living in the soil of the Atacama Desert,” Schulze-Makuch said.
“We believe these microbial communities can lay dormant for hundreds or even thousands of years in conditions very similar to what you would find on a planet like Mars and then come back to life when it rains.”
Scientists returned to the Atacama in 2016 and 2017 for follow-up visits and discovered that the same microbial communities in the soil were gradually reverting to their dormant state.
But they did not completely die off. Single-celled organisms, found mainly in the deeper layers of the desert, “have formed active communities for millions of years and have evolved to cope with the harsh conditions,” said the PNAS report.
Since Mars had oceans and lakes billions of years ago, researchers say early life forms may have thrived there, too.
The world’s space agencies are sending robotic vehicles to Mars in a bid to uncover signs of life, but any attempt to return samples to Earth will be costly and complicated.
Schulze-Makuch said the research may help scientists home in on ways to study Martian microbes, which might have evolved to the planet’s colder, drier climate over time, much like the Atacama microbes.
“We know there is water frozen in the Martian soil and recent research strongly suggests nightly snowfalls and other increased moisture events near the surface,” he said.
“If life ever evolved on Mars, our research suggests it could have found a subsurface niche beneath today’s severely hyper-arid surface.”
Fall of top US scientists points to ethics gap in research
- Links between a doctor leading a clinical trial and manufacturers of drugs or medical equipment used in the study can influence the methodology and ultimately the results
WASHINGTON: Three prominent US scientists have been pushed to resign over the past 10 days after damning revelations about their methods, a sign of greater vigilance and decreasing tolerance for misconduct within the research community.
The most spectacular fall concerned Jose Baselga, chief medical officer at Memorial Sloan Kettering Cancer Center in New York. He authored hundreds of articles on cancer research.
Investigative journalism group ProPublica and The New York Times revealed on September 8 that Baselga failed to disclose in dozens of research articles that he had received millions of dollars from pharmaceutical and medical companies.
Such declarations are generally required by scientific journals.
Links between a doctor leading a clinical trial and manufacturers of drugs or medical equipment used in the study can influence the methodology and ultimately the results.
But journals don’t themselves verify the thoroughness of an author’s declarations.
Caught up in the scandal, Baselga resigned on September 13.
Next came the case of Brian Wansink, director of the Food and Brand Lab at the prestigious Cornell University.
He made his name thanks to studies that garnered plenty of media attention, including on pizza, and the appetites of children.
His troubles began last year when scientific sleuths discovered anomalies and surprisingly positive results in dozens of his articles.
In February, BuzzFeed published messages in which Wansink encouraged a researcher to extract from her data results more likely to go “viral.”
After a yearlong inquiry, Cornell announced on Thursday that Wansink committed “academic misconduct in his research and scholarship,” describing a litany of problems with his results and methods.
He is set to resign at the end of the academic year, but from now on will no longer teach there.
Wansink denied all fraud, but 13 of his articles have already been withdrawn by journals.
In the final case, Gilbert Welch, a professor of public health at Dartmouth College, resigned last week.
The university accused him of plagiarism in an article published in The New England Journal of Medicine, the most respected American medical journal.
“The good news is that we are finally starting to see a lot of these cases become public,” said Ivan Oransky co-founder of the site Retraction Watch, a project of the Center for Scientific Integrity that keeps tabs on retractions of research articles in thousands of journals.
Oransky told AFP that what has emerged so far is only the tip of the iceberg.
The problem, he said, is that scientists, and supporters of science, have often been unwilling to raise such controversies “because they’re afraid that talking about them will decrease trust in science and that it will aid and abet anti-science forces.”
But silence only encourages bad behavior, he argued. According to Oransky, more transparency will in fact only help the public to better comprehend the scientific process.
“At the end of the day, we need to think about science as a human enterprise, we need to remember that it’s done by humans,” he said. “Let’s remember that humans make mistakes, they cut corners, sometimes worse.”
Attention has long focused on financial conflicts of interest, particularly because of the influence of the pharmaceutical industry.
But the Wansink case illustrates that other forms of conflict, including reputational, are equally important. Academic careers are largely built on how much one publishes and in which journals.
As a result, researchers compete to produce positive, new and clear results — but work that produces negative results or validates previous findings should also be rewarded, argued Brian Nosek, a professor of psychology at the University of Virginia who heads the pro-transparency Center for Open Science.
“Most of the work when we’re at the boundary of science is messy, has exceptions, has things that don’t quite fit,” he explained, while “the bad part of the incentives environment is that the reward system is all about the result.”
While moves toward more transparency have gathered momentum over the past decade, in particular among publishers of research articles, there is still a long way to go, said Nosek.
“Culture change is hard,” he argued, adding: “Universities and medical centers are the slowest actors.”