Science360 News Service: Complete

NSF's Rules of Life

Wed, 04 Sep 2019 07:00:00 GMT

NSF documentary about working toward a better life for everyone by solving the riddle of predicting phenotype

New way for bridges to withstand earthquakes: Support column design

Wed, 04 Sep 2019 07:00:00 GMT

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Bridges make travel faster and more convenient, but, in an earthquake, these structures are subject to forces that can cause extensive damage and make them unsafe. Now civil and environmental engineer Petros Sideris of Texas A&M University is leading a National Science Foundation (NSF)-funded research project to investigate the performance of hybrid sliding-rocking (HSR) columns. HSR columns provide the same support as conventional bridge infrastructure columns but are more earthquake-resistant. HSR columns are a series of individual concrete segments held together by steel cables that allow for controlled sliding and rocking. This allows the columns to shift without damage, while post-tensioning strands ensure that at the end of an earthquake the columns are pushed back to their original position. Conventional bridges are cast-in-place monolithic concrete elements that are strong but inflexible. Structural damage in these bridge columns, typically caused by a natural disaster, often forces a bridge to close until repairs are completed. But bridges with HSR columns can withstand large earthquakes with minimal damage and require minor repairs, likely without bridge closures. Such infrastructure helps with post-disaster response and recovery and can save thousands in taxpayer dollars. In an earthquake, HSR columns provide "multiple advantages to the public," Sideris said. "By preventing bridge damage, we can maintain access to affected areas immediately after an event for response teams to be easily deployed, and help affected communities recover faster. In mitigating losses related to post-event bridge repairs and bridge closures, more funds can be potentially directed to supporting the recovery of the affected communities." According to Joy Pauschke, NSF program director for natural hazards engineering, "NSF invests in fundamental engineering research so that, in the future, the nation's infrastructure can be more resilient to earthquakes, hurricanes, and other forces of nature."

Image credit: Texas A&M University

Virtual 'UniverseMachine' sheds light on galaxy evolution

Wed, 04 Sep 2019 07:00:00 GMT

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How do galaxies such as our Milky Way come into existence? How do they grow and change over time? The science behind galaxy formation has long been a puzzle, but a University of Arizona-led team of scientists is one step closer to finding answers, thanks to supercomputer simulations. Observing real galaxies in space can only provide snapshots in time, so researchers who study how galaxies evolve over billions of years need to use computer simulations. Traditionally, astronomers have used simulations to invent theories of galaxy formation and test them, but they have had to proceed one galaxy at a time. Peter Behroozi of the university's Steward Observatory and colleagues overcame this hurdle by generating millions of different universes on a supercomputer, each according to different physical theories for how galaxies form. The findings challenge fundamental ideas about the role dark matter plays in galaxy formation, the evolution of galaxies over time and the birth of stars. The study is the first to create self-consistent universes that are exact replicas of the real ones -- computer simulations that each represent a sizeable chunk of the actual cosmos, containing 12 million galaxies and spanning the time from 400 million years after the Big Bang to the present day. The results from the "UniverseMachine," as the authors call their approach, have helped resolve the long-standing paradox of why galaxies cease to form new stars even when they retain plenty of hydrogen gas, the raw material from which stars are forged. The research is partially funded by NSF's Division of Physics through grants to UC Santa Barbara's Kavli Institute for Theoretical Physics and the Aspen Center for Physics.

Image credit: NASA/ESA/J. Lotz and the HFF Team/STScI

Tiny thermometer measures how mitochondria heat up the cell by unleashing proton energy

Wed, 04 Sep 2019 07:00:00 GMT

A new way to measure how water moves

Wed, 04 Sep 2019 07:00:00 GMT

New science blooms after star researchers die, study finds

Wed, 04 Sep 2019 07:00:00 GMT

The National Science Foundation: Creating knowledge to transform our future

Wed, 04 Sep 2019 07:00:00 GMT

The National Science Foundation: Creating knowledge to transform our future

NSF's Listening to the Arctic

Tue, 03 Sep 2019 07:00:00 GMT

NSF documentary about the race against nature to understand and meet the challenges of the rapidly changing Arctic

New sensors to monitor storm surge on bridges

Tue, 03 Sep 2019 07:00:00 GMT

New sensors to monitor storm surge on bridges

Technique uses magnets, light to control and reconfigure soft robots

Tue, 03 Sep 2019 07:00:00 GMT

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National Science Foundation (NSF)-funded researchers from North Carolina State and Elon universities have developed a technique that allows them to remotely control the movement of soft robots, lock them into position for as long as needed and later reconfigure the robots into new shapes. The technique relies on light and magnetic fields. "By engineering the properties of the material, we can control the soft robot's movement remotely; we can get it to hold a given shape; we can then return the robot to its original shape or further modify its movement; and we can do this repeatedly. All of those things are valuable, in terms of this technology's utility in biomedical or aerospace applications," says Joe Tracy, a professor of materials science and engineering at NC State and corresponding author of a paper on the work. In experimental testing, the researchers demonstrated that the soft robots could be used to form "grabbers" for lifting and transporting objects. The soft robots could also be used as cantilevers or folded into "flowers" with petals that bend in different directions. "We are not limited to binary configurations, such as a grabber being either open or closed," says Jessica Liu, first author of the paper and a Ph.D. student at NC State. "We can control the light to ensure that a robot will hold its shape at any point."

Image credit: Jessica A.C. Liu

Scientists recover the first genetic data from an extinct bird in the Caribbean

Tue, 03 Sep 2019 07:00:00 GMT

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Scientists have recovered the first genetic data from an extinct bird in the Caribbean, thanks to the remarkably preserved bones of a Creighton's caracara in a flooded sinkhole on Great Abaco Island in the Bahamas. Studies of ancient DNA from tropical birds have faced two formidable obstacles. Organic material quickly degrades when exposed to heat, light and oxygen. And birds' lightweight, hollow bones break easily, accelerating the decay of the DNA within. But the dark, oxygen-free depths of a 100-foot blue hole known as Sawmill Sink provided ideal preservation conditions for the bones of Caracara creightoni, a species of large carrion-eating falcon that disappeared soon after humans arrived in the Bahamas about 1,000 years ago. Florida Museum of Natural History researcher Jessica Oswald and her colleagues extracted and sequenced genetic material from the 2,500-year-old C. creightoni femur. Because ancient DNA is often fragmented or missing, the team had modest expectations for what they would find –- maybe one or two genes. But instead, the bone yielded 98.7% of the bird's mitochondrial genome, the DNA most living things inherit from their mothers. The mitochondrial genome showed that C. creightoni is closely related to the two remaining caracara species alive today: the crested caracara and the southern caracara. The three species last shared a common ancestor between 1.2 and 0.4 million years ago. "This project enhanced our understanding of the ecological and evolutionary implications of extinction, forged strong international partnerships, and trained the next generation of researchers," says Jessica Robin, a program director in National Science Foundation's Office of International Science and Engineering, which funded the study.

Image credit: Florida Museum photo by Kristen Grace

Islet-on-a-chip technology streamlines diabetes research

Tue, 03 Sep 2019 07:00:00 GMT

Stretchable wireless sensor could monitor healing of cerebral aneurysms

Tue, 03 Sep 2019 07:00:00 GMT

Using AI to track birds' dark-of-night migrations

Tue, 03 Sep 2019 07:00:00 GMT

4 awesome discoveries you probably didn't hear about this week -- Episode 32

Sat, 31 Aug 2019 07:00:00 GMT

4 awesome discoveries you probably didn't hear about this week -- Episode 32

Preparing Technicians for the Future of Work

Fri, 30 Aug 2019 07:00:00 GMT

Silver Buckshot: A micro-credentials approach to training and education

NSF Science Now: Episode 65

Fri, 30 Aug 2019 07:00:00 GMT

NSF Science Now: Episode 65

Using Wi-Fi like sonar to measure speed and distance of indoor movement

Fri, 30 Aug 2019 07:00:00 GMT

Nuclear winter would threaten nearly everyone on Earth

Fri, 30 Aug 2019 07:00:00 GMT

Data from Hawaii observatory helps scientists discover giant planet slingshots around its star

Fri, 30 Aug 2019 07:00:00 GMT

Astronomers find a golden glow from a distant stellar collision

Fri, 30 Aug 2019 07:00:00 GMT

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On August 17, 2017, scientists made history with the first direct observation of a merger between two neutron stars. It was the first cosmic event detected in both gravitational waves and the entire spectrum of light, from gamma rays to radio emissions. The impact also created a kilonova -- a turbocharged explosion that instantly forged several hundred planets’ worth of gold and platinum. The observations provided the first compelling evidence that kilonovae produce large quantities of heavy metals, a finding long predicted by theory. Astronomers suspect that all of the gold and platinum on Earth formed as a result of ancient kilonovae created during neutron star collisions. Based on data from the 2017 event, first spotted by the Laser Interferometer Gravitational-wave Observatory (LIGO), astronomers began to adjust their assumptions of how a kilonova should appear to Earth-bound observers. A team of scientists reexamined data from a gamma-ray burst spotted in August 2016 and found new evidence for a kilonova that went unnoticed during the initial observations.

Image credit: NASA/ESA/E. Troja

Lemurs find love at first whiff

Fri, 30 Aug 2019 07:00:00 GMT

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Many people turn to the Internet to find a Mr. or Ms. Right. But lemurs just give their potential partners a sniff. A study of lemur scents has found that an individual’s distinctive body odor reflects genetic differences in their immune system, and that other lemurs can detect these differences by smell. From just one whiff, these primates can tell which prospective partners have immune genes different from their own. The ability to sniff out mates with different immune genes could make their offspring’s immune systems more diverse and able to fight more pathogens. Shown here: Fritz the ring-tailed lemur sniffs a tree for traces of other lemurs’ scents.

Image credit: David Haring/Duke Lemur Center

Preparing Technicians for the Future of Work

Thu, 29 Aug 2019 07:00:00 GMT

Design thinking for gender equity

New way to 'see' objects accelerates the future of self-driving cars

Thu, 29 Aug 2019 07:00:00 GMT

New way to 'see' objects accelerates the future of self-driving cars

Native approaches to fire management could revitalize communities

Thu, 29 Aug 2019 07:00:00 GMT

Seismic readings reveal Castleton Tower's unseen vibrations

Thu, 29 Aug 2019 07:00:00 GMT

Researchers identify fundamental properties of cells that affect how tissue structures form

Thu, 29 Aug 2019 07:00:00 GMT

Study finds big increase in ocean carbon dioxide absorption along West Antarctic Peninsula

Thu, 29 Aug 2019 07:00:00 GMT

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A new study shows that the West Antarctic Peninsula is experiencing some of the most rapid climate change on Earth, featuring dramatic increases in temperatures, retreats in glaciers and declines in sea ice. The Southern Ocean absorbs nearly half of the carbon dioxide -- the key greenhouse gas linked to climate change -- that is absorbed by all the world's oceans. The study tapped an unprecedented 25 years of oceanographic measurements in the Southern Ocean and highlights the need for more monitoring in the region. The research revealed that carbon dioxide absorption by surface waters off the West Antarctic Peninsula is linked to the stability of the upper ocean, along with the amount and type of algae present. A stable upper ocean provides algae with ideal growing conditions. During photosynthesis, algae remove carbon dioxide from the surface ocean, which in turn draws carbon dioxide out of the atmosphere. From 1993 to 2017, changes in sea ice dynamics off the West Antarctic Peninsula stabilized the upper ocean, resulting in greater algal concentrations and a shift in the mix of algal species. That's led to a nearly five-fold increase in carbon dioxide absorption during the summertime. The research also found a strong north-south difference in the trend of carbon dioxide absorption. The southern portion of the peninsula, which to date has been less impacted by climate change, experienced the most dramatic increase in carbon dioxide absorption, demonstrating the poleward progression of climate change in the region.

Image credit: Drew Spacht/The Ohio State University

Could graphene-lined clothing prevent mosquito bites?

Thu, 29 Aug 2019 07:00:00 GMT

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A new study shows that graphene sheets can block the signals mosquitoes use to identify a blood meal, potentially enabling a new chemical-free approach to mosquito bite prevention. Researchers showed that multilayer graphene can provide a twofold defense against mosquito bites. The ultra-thin yet strong material acts as a barrier that mosquitoes are unable to bite through. At the same time, experiments showed that graphene also blocks chemical signals mosquitoes use to sense that a blood meal is near, blunting their urge to bite in the first place. The findings suggest that clothing with a graphene lining could be an effective mosquito barrier.

Image credit: Hurt Lab/Brown University

Preparing Technicians for the Future of Work

Wed, 28 Aug 2019 07:00:00 GMT

One of the key things to measure

When human expertise improves the work of machines

Wed, 28 Aug 2019 07:00:00 GMT

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Machine learning algorithms can sometimes do a great job with a little help from human expertise, at least in the field of materials science. In many specialized areas of science, engineering and medicine, researchers are turning to machine learning algorithms to analyze data sets that have grown too large for humans to understand. In materials science, success with this effort could accelerate the design of next-generation advanced functional materials, where development now usually depends on old-fashioned trial and error. By themselves, however, data analytics techniques borrowed from other research areas often fail to provide the insights needed to help materials scientists and engineers choose which of many variables to adjust -- and the techniques can't account for dramatic changes such as the introduction of a new chemical compound into the process. In a new study, researchers explain a technique known as dimensional stacking, which shows that human experience still has a role to play in the age of machine intelligence. The machines gain an edge at solving a challenge when the data to be analyzed are intelligently organized based on human knowledge of what factors are likely to be important and related. "When your machine accepts strings of data, it really does matter how you are putting those strings together," said Nazanin Bassiri-Gharb, the paper's corresponding author and a scientist at the Georgia Institute of Technology. "We must be mindful that the organization of data before it goes to the algorithm makes a difference. If you don't plug the information in correctly, you will get a result that isn't necessarily correlated with the reality of the physics and chemistry that govern the materials."

Image credit: Rob Felt/Georgia Tech

Genetic redundancy aids competition among symbiotic bacteria in squid

Wed, 28 Aug 2019 07:00:00 GMT

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The molecular mechanism used by many bacteria to kill neighboring cells has redundancy built into its genetic makeup, which could allow for the mechanism to be expressed in different environments, say researchers at Penn State and the University of Wisconsin-Madison. Their new study provides insights into the molecular mechanisms of competition among bacteria. "Many organisms, including humans, acquire bacteria from their environment," said Tim Miyashiro, a biochemist and molecular biologist at Penn State and the leader of the research team. "These bacteria can contribute to functions within the host organism, like how our gut bacteria help us digest food. We're interested in the interactions among bacteria cells, and between bacteria and their hosts, to better understand these mutually beneficial symbiotic relationships." Cells of the bioluminescent bacteria Vibrio fisheri take up residence in the light organ of newly hatched bobtail squid. At night, the bacteria produce a blue glow that researchers believe obscures a squid's silhouette and helps protect it from predators. The light organ has pockets, or crypts, in the squid's skin that provide nutrients and a safe environment for the bacteria. "When the squid hatches, it doesn't yet have any bacteria in its light organ," said Miyashiro. "But bacteria in the environment quickly colonize the squid's light organ." Some of these different bacteria strains can coexist, but others can't. "Microbial symbioses are essentially universal in animals, and are crucial to the health and development of both partners," says Irwin Forseth, a program director in the National Science Foundation's Division of Integrative Organismal Systems, which funded the research. "The results from this study highlight the role small genetic changes can play in microbe interactions. Increased understanding will allow us to better predict organisms' performance in changing environments."

Image credit: Andrew Cecere

Salt marshes' capacity to sink carbon may be threatened by nitrogen pollution

Wed, 28 Aug 2019 07:00:00 GMT

Physicists demonstrate silicon's energy-harvesting power in study

Wed, 28 Aug 2019 07:00:00 GMT

Scurrying roaches help researchers steady staggering robots

Wed, 28 Aug 2019 07:00:00 GMT

Camera brings unseen world to light

Wed, 28 Aug 2019 07:00:00 GMT

Camera brings unseen world to light

Preparing Technicians for the Future of Work

Tue, 27 Aug 2019 07:00:00 GMT

Smarter and more independent robots

Genetic diversity couldn't save Darwin's finches

Tue, 27 Aug 2019 07:00:00 GMT

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A National Science Foundation-funded study found that Charles Darwin's famous finches defy what has long been considered a key to evolutionary success: genetic diversity. The research on finches of the Galapagos Islands could change the way conservation biologists think about a species' potential for extinction in naturally fragmented populations. Researchers examined 212 tissue samples from museum specimens and living birds. Some of the museum specimens in the study were collected by Darwin himself in 1835. Only one of the extinct populations, a species called the vegetarian finch, had lower genetic diversity compared to modern survivors. Specifically, researchers believe a biological phenomenon called sink-source dynamics is at play in which larger populations of birds from other islands act as a "source" of immigrants to the island population that is naturally shrinking, the "sink." Without these immigrant individuals, the natural population on the island likely would continue to dwindle to local extinction. The immigrants have diverse genetics because they are coming from a variety of healthier islands, giving this struggling "sink" population inflated genetic diversity.

Image credit: Jose Barreiro

Why animals eat what they eat

Tue, 27 Aug 2019 07:00:00 GMT

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What an animal eats is a fundamental aspect of its biology, but surprisingly, the evolution of diet had not been studied across the animal kingdom until now. Scientists at the University of Arizona report several unexpected findings from taking a deep dive into the evolutionary history of more than one million animal species and going back 800 million years, when the first animals appeared on our planet. The study revealed several surprising key insights: Many species living today that are carnivorous, meaning they eat other animals, can trace this diet back to a common ancestor more than 800 million years ago; A plant-based, or herbivorous, diet is not the evolutionary driver for new species that it was believed to be; Closely related animals tend to share the same dietary category -- plant-eating, meat-eating, or both. This finding implies that switching between dietary lifestyles is not something that happens easily and often over the course of evolution.

Image credit: Daniel Stolte/UANews

Experiments illuminate key component of plants' immune systems

Tue, 27 Aug 2019 07:00:00 GMT