Science & Technology
Scientists develop artificial retina that could restore vision to millions with retinal degeneration
Mon, 13 Mar 2017 00:00 UTC
The implant, which converts light into an electrical signal that stimulates retinal neurons, could give hope to millions who experience retinal degeneration - including retinitis pigmentosa - in which photoreceptor cells in the eye begin to break down, leading to blindness.
The retina is located at the back of the eye, and is made up of millions of these light-sensitive photoreceptors. But mutations in any one of the 240 identified genes can lead to retinal degeneration, where these photoreceptor cells die off, even while the retinal neurons around them are unaffected.
Because the retinal nerves remain intact and functional, previous research has looked at treating retinitis pigmentosa with bionic eye devices that stimulate the neurons with lights, while other scientists have investigated using CRISPR gene editing to repair the mutations that cause blindness.
Now, a team led by the Italian Institute of Technology has developed a new approach, with a prosthesis implanted into the eye that serves as a working replacement for a damaged retina.
Mon, 13 Mar 2017 14:08 UTC
Instead, researchers have found that dendrites generate up to 10 times more electrical pulse spikes than parts of our brain cells called the soma, which until now were thought to be the main area to produce these electrical signals.
If verified, the study could change our understanding of neurons, and how the various parts of the human brain work together.
"Knowing [dendrites] are much more active than the soma fundamentally changes the nature of our understanding of how the brain computes information," said one of the team, Mayank Mehta, from the University of California, Los Angeles (UCLA).
"It may pave the way for understanding and treating neurological disorders, and for developing brain-like computers."
Tue, 07 Mar 2017 00:00 UTC
Mr Hawking believes the current AI race will eventually usher humans into a stage when machines will become more intelligent than humans. This is when the total annihilation of humans would begin, Hawking claims. Of course, the AI community prefers not to hear such a prominent and respected science proponent say such things. Hawking was heavily criticized within the AI community recently, facing accusations of being a pessimist, and should inculcate the spirit of positivism in the AI debate instead.
Comment: Stephen Hawking sees the writing on the wall and is attempting to warn others of the direction we are headed. But is anyone listening?
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Wed, 08 Mar 2017 19:12 UTC
Jenniskens runs the NASA sponsored project Cameras for Allsky Meteor Surveillance (CAMS) in Northern California, which aims to confirm some of the 300+ meteor showers on the International Astronomical Union (IAU) Working List that still need verification. 60 low-light video cameras film the skies over the San Francisco Bay Area and have recorded more than 300,000 meteoroid trajectories since beginning observations in 2010.
The observations show that meteor showers do not stay in one place. For example, the well-known Perseids get their name from the constellation of Perseus from which they radiate at their peak in mid-August. But the camera networks first detect the shower on July 1 in Cassiopeia. And the Perseids are tracked until September 3, when the meteors radiate from the neighboring constellation Camelopardalis.
Wed, 01 Mar 2017 16:26 UTC
Researchers say that 208 of more than 5,200 officially recognised minerals are exclusively, or largely, linked to human activity, with crystals forming in locations as diverse as shipwrecks, mines and even museum drawers.
"This is a spike of mineral novelty that is so rapid - most of it in the last 200 years, compared to the 4.5bn year history of Earth. There is nothing like it in Earth's history," said Robert Hazen, co-author of the research from the Carnegie Institution for Science. "This is a blink of an eye, it is just a surge and of course we are only seeing the tip of the iceberg."
In addition, the study points out that many more "mineral-like" substances, from laser crystals to components of concrete, have been devised and produced by human hands. "Human ingenuity has led to a host of crystalline compounds that never before existed in the solar system, and perhaps in the universe," the authors write.
Sat, 11 Mar 2017 00:00 UTC
A scientist has filmed the moment plastic microfibre is ingested by plankton, illustrating how the material is affecting life beneath the waves.
The footage shows one way that waste plastic could be entering the marine and global food chain.
An estimated 150 million tonnes of plastic "disappears" from the world's waste stream each year.
Waste plastic in the world's seas has been recognised by the United Nations as a major environmental problem.
"When I saw it, I thought that here was something, visually, to convey to the public the problem of plastic in the sea," said Richard Kirby, who recorded the footage.
"What intrigues me is that because the fibre has made a loop inside the animal's gut, you can actually see the consequences of something as small as the arrow worm consuming microplastic.
Sat, 11 Mar 2017 09:51 UTC
The report released this week did not provide further details, but Zhang compared the Chinese spacecraft to the Orion currently being developed by NASA and the ESA.
The Shenzhou, China's current manned spaceship based on the Russian Soyuz design, is capable of carrying up to three astronauts. It completed its first manned mission in 2003, after which Beijing managed to place a habitable space station into orbit. A bigger station, which would be manned full-time like the ISS, is expected to be operational within five years, and manned Moon missions may follow sometime later.
Fri, 21 Aug 2015 17:36 UTC
The conclusion from a research team at New York's Mount Sinai hospital led by Rachel Yehuda stems from the genetic study of 32 Jewish men and women who had either been interned in a Nazi concentration camp, witnessed or experienced torture or who had had to hide during the second world war.
They also analysed the genes of their children, who are known to have increased likelihood of stress disorders, and compared the results with Jewish families who were living outside of Europe during the war. "The gene changes in the children could only be attributed to Holocaust exposure in the parents," said Yehuda.
Her team's work is the clearest example in humans of the transmission of trauma to a child via what is called "epigenetic inheritance" - the idea that environmental influences such as smoking, diet and stress can affect the genes of your children and possibly even grandchildren.
Reproducibility crisis: New data shows that most scientists can't replicate the findings of their peers
The Free Thought Project
Sat, 11 Mar 2017 17:19 UTC
While many studies appear to be promising upon one's initial review, they may not be nearly as reproducible as once believed. An initiative called the Reproducibility Project, led by University of Virginia psychology professor Brian Nosek, has been hard at work since 2011 seeking to analyze the reliability of dozens of studies by attempting to replicate them.
The project began after two separate discoveries, from pharmaceutical companies Bayer Healthcare and Amgen, that revealed their scientists were only able to verify a low percentage of previous studies.
The process in itself saw considerable difficulty. Elizabeth Iorns, a leader of The Reproducibility Project, and project manager Tim Errington aimed to ensure that the replications precisely followed the original methodology. They soon discovered that tracking down the raw data and identifying what the labs consisted of was a time-consuming endeavor. As noted in The Atlantic, the methods included in many of the original studies "theoretically ought to provide recipes for doing the same experiments. But often, those recipes are incomplete, missing out important steps, details, or ingredients. In some cases, the recipes aren't described at all; researchers simply cite an earlier study that used a similar technique."
Comment: Are these honest scientific mistakes or is reproducibility impossible due to the rampant fraud that occurs in research?
- Corrupt Science: Cancer Research of 10 Years Useless: Fraudulent Studies, Says Mayo Clinic
- US scientists significantly more likely to publish fake research
- Fraud is growing more rampant in scientific studies
- Corruption of Science: Fraud and Errors in Scientific Studies Skyrocket
In 1990 (over two decades ago) the sociologist Pierre van den Berghe wrote an article entitled Why Most Sociologists Don't (and Won't) Think Evolutionarily. I had to read this article as a graduate student in 2007. For context, that means that when my eyes first scanned the pages the essay was already 17 years old. I remember being struck by the venom that dripped off the page. The author seemed angry, he seemed frustrated. He railed against so many things, but his ire was focused particularly in the traditional sociological way of doing business: