Best from science journals: Million-year-old plant fossils beneath Greenland

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Here are some of the most interesting research papers to have appeared in top science journals last week.

(Subscribe to Science For All, our weekly newsletter, where we aim to take the jargon out of science and put the fun in. Click here.)

Deep secrets of Greenland

Published in PNAS

By studying sediments and twig fossils collected from northwestern Greenland, researchers note that the ice in the region entirely melted at least once within the past one million years and was covered with plants and trees. The authors say this shows Greenland is much more sensitive to natural climate warming than previously thought and it can quickly melt and pour into the oceans drowning major coastal cities.

Plastic bags into fabrics

Published in Nature Sustainability

MIT engineers have converted polyethylene, the plastic used to make bottles and wrapping, into weavable fibers. The silky and lightweight fabric was found to absorb and evaporate water more quickly than cotton and nylon. The team is now exploring ways to incorporate this new fabric into cooling athletic apparel and even next-generation spacesuits.

Engineers have developed self-cooling fabrics from polyethylene, a material commonly used in plastic bags. Credit: https://news.mit.edu/

Engineers have developed self-cooling fabrics from polyethylene, a material commonly used in plastic bags. Credit: https://news.mit.edu/
 

Survival strategies

Published in Nature Communications

The human mouth and esophagus have a slightly alkaline environment, while our stomachs are strongly acidic, followed by the intestine which is pH-neutral. How do bacteria adapt to these changes in the environment? A new study found that pathogenic bacteria can quickly change the structure of their injection apparatus according to external conditions, thus helping them survive.

47 million-year-old fly

Published in Current Biology

Researchers from Vienna have found a previously unknown fossilised fly species in the lake sediments of the Messel Pit, a UNESCO World Heritage Site in Germany. What surprised them more was that the fly had a bulged abdomen filled with the fly’s last meal. A detailed study showed that it was pollen from different plants and the team has tried to reconstruct the ancient environment it lived in, the flowers it visited and its feeding behaviour.

Fossil fly, Hirmoneura messelense from the Messel Pit. Credit: Senckenberg

Fossil fly, Hirmoneura messelense from the Messel Pit. Credit: Senckenberg
 

AI to generate 3D holograms

Published in Nature

A new holography method called tensor holography can craft 3D holograms from images in mere milliseconds, says a new study. It requires less than 1 MB of memory and can run on a smartphone. The team hopes that it could enable the creation of holograms for virtual reality, 3D printing and medical imaging.

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Best from science journals: A robot without electronics

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Here are some of the most interesting research papers to have appeared in top science journals last week.

(Subscribe to Science For All, our weekly newsletter, where we aim to take the jargon out of science and put the fun in. Click here.)

Air-powered robot

Published in Science Robotics

If you thought all robots need electronics to function, meet this cute four-legged soft robot that uses pressurised air to function. The authors write that these robots can find applications in places where electronics cannot function, such as MRI machines and mine shafts. The team is now working to improve the robot’s gait to help it walk on uneven surfaces and navigate over obstacles.

 

Massive black hole

Published in Science

Cygnus X-1, one of the closest black holes to Earth discovered in 1964, has now been found to have a mass of over 20 times the mass of our Sun. Co-author Professor Ilya Mandel said in a release that the black hole is so massive it’s actually challenging how astronomers thought they formed. “The black hole in the Cygnus X-1 system began life as a star approximately 60 times the mass of the Sun and collapsed tens of thousands of years ago,” he said.

Recent observations show the black hole in the Cygnus X-1 system is 21 times the mass of the Sun—a 50% increase on previous estimates. To form such a massive black hole, astronomers had to revise their estimates of how much mass stars lose via stellar winds. Credit: International Centre for Radio Astronomy Research.

Recent observations show the black hole in the Cygnus X-1 system is 21 times the mass of the Sun—a 50% increase on previous estimates. To form such a massive black hole, astronomers had to revise their estimates of how much mass stars lose via stellar winds. Credit: International Centre for Radio Astronomy Research.
 

New crystalline ice form

Published in Nature Communications

Ice is a very versatile material, with about 18 crystalline forms known so far. The different arrangement of hydrogen and oxygen atoms, different pressure and temperature help in the formation of these different types of ice. Using a new cooling process and by increasing the pressure to around 20-kilo bar, researchers produced a new ice XIX and have now elucidated its crystal structure.

Gut phages

Published in Cell

The Gut Phage Database, a collection of 142,809 non-redundant viral genomes (>10 kb) obtained by mining a dataset of 28,060 globally distributed human gut metagenomes and 2,898 reference genomes of cultured gut bacteria. Image credit: Camarillo-Guerrero et al.,

The Gut Phage Database, a collection of 142,809 non-redundant viral genomes (>10 kb) obtained by mining a dataset of 28,060 globally distributed human gut metagenomes and 2,898 reference genomes of cultured gut bacteria. Image credit: Camarillo-Guerrero et al.,
 

The human gut houses over 142,000 species of bacteriophages (viruses that infect bacteria), notes a new study. “It’s important to remember that not all viruses are harmful, but represent an integral component of the gut ecosystem,” says co-author Dr. Alexandre Almeida in a release. “It’s fascinating to see how many unknown species live in our gut, and to try and unravel the link between them and human health.”

When CRISPR met corn

Published in Nature Plants

Using the gene-editing tool CRISPR, researchers have now found a way to increase the number of maize kernels per cob. “A lot of people were using CRISPR in a very simple sense just to disrupt genes completely, to knock out the gene. But we came up with this new idea to CRISPR the promoter regions that turn the gene on,” says Professor David Jackson in a release. The team hopes this new strategy will increase crop yield per acre and make agriculture more sustainable.

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