It’s possible that I shall make an ass of myself. But in that case one can always get out of it with a little dialectic. I have, of course, so worded my proposition as to be right either way (K.Marx, Letter to F.Engels on the Indian Mutiny)
Sunday, July 05, 2020
Higher concentration of metal in Moon's craters provides new insights to its origin
New observations could challenge previous theories of how the Moon was formed
UNIVERSITY OF SOUTHERN CALIFORNIA
IMAGE: VIEW OF MOON LIMB, WITH EARTH ON THE HORIZON view more
CREDIT: NASA APOLLO 11 MISSION IMAGE
Life on Earth would not be possible without the Moon; it keeps our planet's axis of rotation stable, which controls seasons and regulates our climate. However, there has been considerable debate over how the Moon was formed. The popular hypothesis contends that the Moon was formed by a Mars-sized body colliding with Earth's upper crust which is poor in metals. But new research suggests the Moon's subsurface is more metal-rich than previously thought, providing new insights that could challenge our understanding of that process.
Today, a study published in Earth and Planetary Science Letters sheds new light on the composition of the dust found at the bottom of the Moon's craters. Led by Essam Heggy, research scientist of electrical and computer engineering at the USC Viterbi School of Engineering, and co-investigator of the Mini-RF instrument onboard NASA Lunar Reconnaissance Orbiter (LRO), the team members of the Miniature Radio Frequency (Mini-RF) instrument on the Lunar Reconnaissance Orbiter (LRO) mission used radar to image and characterize this fine dust. The researchers concluded that the Moon's subsurface may be richer in metals (i.e. Fe and Ti oxides) than scientists had believed.
According to the researchers, the fine dust at the bottom of the Moon's craters is actually ejected materials forced up from below the Moon's surface during meteor impacts. When comparing the metal content at the bottom of larger and deeper craters to that of the smaller and shallower ones, the team found higher metal concentrations in the deeper craters.
What does a change in recorded metal presence in the subsurface have to do with our understanding of the Moon? The traditional hypothesis is that approximately 4.5 billion years ago there was a collision between Earth and a Mars-sized proto-planet (named Theia). Most scientists believe that that collision shot a large portion of Earth's metal-poor upper crust into orbit, eventually forming the Moon.
One puzzling aspect of this theory of the Moon's formation, has been that the Moon has a higher concentration of iron oxides than the Earth--a fact well-known to scientists. This particular research contributes to the field in that it provides insights about a section of the moon that has not been frequently studied and posits that there may exist an even higher concentration of metal deeper below the surface. It is possible, say the researchers that the discrepancy between the amount of iron on the Earth's crust and the Moon could be even greater than scientists thought, which pulls into question the current understanding of how the Moon was formed.
The fact that our Moon could be richer in metals than the Earth challenges the notion that it was portions of Earth's mantle and crust that were shot into orbit. A greater concentration of metal deposits may mean that other hypotheses about the Moon's formation must be explored. It may be possible that the collision with Theia was more devastating to our early Earth, with much deeper sections being launched into orbit, or that the collision could have occurred when Earth was still young and covered by a magma ocean. Alternatively, more metal could hint at a complicated cool-down of an early molten Moon surface, as suggested by several scientists.
According to Heggy, "By improving our understanding of how much metal the Moon's subsurface actually has, scientists can constrain the ambiguities about how it has formed, how it is evolving and how it is contributing to maintaining habitability on Earth." He further added, "Our solar system alone has over 200 moons - understanding the crucial role these moons play in the formation and evolution of the planets they orbit can give us deeper insights into how and where life conditions outside Earth might form and what it might look like."
Wes Patterson of the Planetary Exploration Group (SRE), Space Exploration Sector (SES) at Johns Hopkins University Applied Physics Laboratory, who is the project's principal investigator for Mini-RF and a co-author of the study, added, "The LRO mission and its radar imager Mini-RF are continuing to surprise us with new insights into the origins and complexity of our nearest neighbor."
The team plans to continue carrying out additional radar observations of more crater floors with the Mini-RF experiment to verify the initial findings of the published investigation.
###
This research project was funded through the University of Southern California under NASA award NNX15AV76G.
Radar points to moon being more metallic than researchers thought
NASA/GODDARD SPACE FLIGHT CENTER
IMAGE: THIS IMAGE BASED ON DATA FROM NASA'S LUNAR RECONNAISSANCE ORBITER SPACECRAFT SHOWS THE FACE OF THE MOON WE SEE FROM EARTH. THE MORE WE LEARN ABOUT OUR NEAREST NEIGHBOR, THE... view more
CREDIT: NASA / GSFC / ARIZONA STATE UNIVERSITYWhat started out as a hunt for ice lurking in polar lunar craters turned into an unexpected finding that could help clear some muddy history about the Moon's formation.
Team members of the Miniature Radio Frequency (Mini-RF) instrument on NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft found new evidence that the Moon's subsurface might be richer in metals, like iron and titanium, than researchers thought. That finding, published July 1 in Earth and Planetary Science Letters, could aid in drawing a clearer connection between Earth and the Moon.
"The LRO mission and its radar instrument continue to surprise us with new insights about the origins and complexity of our nearest neighbor," said Wes Patterson, Mini-RF principal investigator from the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, and a study coauthor.
Substantial evidence points to the Moon as the product of a collision between a Mars-sized protoplanet and young Earth, forming from the gravitational collapse of the remaining cloud of debris. Consequently, the Moon's bulk chemical composition closely resembles that of Earth.
Look in detail at the Moon's chemical composition, however, and that story turns murky. For example, in the bright plains of the Moon's surface, called the lunar highlands, rocks contain smaller amounts of metal-bearing minerals relative to Earth. That finding might be explained if Earth had fully differentiated into a core, mantle and crust before the impact, leaving the Moon largely metal-poor. But turn to the Moon's maria -- the large, darker plains -- and the metal abundance becomes richer than that of many rocks on Earth.
This discrepancy has puzzled scientists, leading to numerous questions and hypotheses regarding how much the impacting protoplanet may have contributed to the differences. The Mini-RF team found a curious pattern that could lead to an answer.
Using Mini-RF, the researchers sought to measure an electrical property within lunar soil piled on crater floors in the Moon's northern hemisphere. This electrical property is known as the dielectric constant, a number that compares the relative abilities of a material and the vacuum of space to transmit electric fields, and could help locate ice lurking in the crater shadows. The team, however, noticed this property increasing with crater size.
For craters approximately 1 to 3 miles (2 to 5 kilometers) wide, the dielectric constant of the material steadily increased as the craters grew larger, but for craters 3 to 12 miles (5 to 20 kilometers) wide, the property remained constant.
"It was a surprising relationship that we had no reason to believe would exist," said Essam Heggy, coinvestigator of the Mini-RF experiments from the University of Southern California in Los Angeles and lead author of the published paper.
Discovery of this pattern opened a door to a new possibility. Because meteors that form larger craters also dig deeper into the Moon's subsurface, the team reasoned that the increasing dielectric constant of the dust in larger craters could be the result of meteors excavating iron and titanium oxides that lie below the surface. Dielectric properties are directly linked to the concentration of these metal minerals.
If their hypothesis were true, it would mean only the first few hundred meters of the Moon's surface is scant in iron and titanium oxides, but below the surface, there's a steady increase to a rich and unexpected bonanza.
Comparing crater floor radar images from Mini-RF with metal oxide maps from the LRO Wide-Angle Camera, Japan's Kaguya mission and NASA's Lunar Prospector spacecraft, the team found exactly what it had suspected. The larger craters, with their increased dielectric material, were also richer in metals, suggesting that more iron and titanium oxides had been excavated from the depths of 0.3 to 1 mile (0.5 to 2 kilometers) than from the upper 0.1 to 0.3 miles (0.2 to 0.5 kilometers) of the lunar subsurface.
"This exciting result from Mini-RF shows that even after 11 years in operation at the Moon, we are still making new discoveries about the ancient history of our nearest neighbor," said Noah Petro, the LRO project scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland. "The MINI-RF data is incredibly valuable for telling us about the properties of the lunar surface, but we use that data to infer what was happening over 4.5 billion years ago!"
These results follow recent evidence from NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission that suggests a significant mass of dense material exists just a few tens to hundreds of kilometers beneath the Moon's enormous South Pole-Aitken basin, indicating that dense materials aren't uniformly distributed in the Moon's subsurface.
The team emphasizes that the new study can't directly answer the outstanding questions about the Moon's formation, but it does reduce the uncertainty in the distribution of iron and titanium oxides in the lunar subsurface and provide critical evidence needed to better understand the Moon's formation and its connection to Earth.
"It really raises the question of what this means for our previous formation hypotheses," Heggy said.
Anxious to uncover more, the researchers have already started examining crater floors in the Moon's southern hemisphere to see if the same trends exist there.
###
LRO is managed by NASA's Goddard Space Flight Center in Greenbelt, Maryland for the Science Mission Directorate at NASA Headquarters in Washington. Mini-RF was designed, built and tested by a team led by APL, Naval Air Warfare Center, Sandia National Laboratories, Raytheon and Northrop Grumman.
University of Göttingen research team investigates the influence of insect and microalgae feeds on meat quality
UNIVERSITY OF GÖTTINGEN
IMAGE: RESEARCHERS AT THE UNIVERSITY OF GÖTTINGEN HAVE FOUND THAT THE MEAT QUALITY OF CHICKENS FED WITH CERTAIN INSECTS OR MICROALGAE IS SUITABLE FOR HUMAN CONSUMPTION. view more
CREDIT: QUALITY OF ANIMAL PRODUCTS, UNIVERSITY OF GÖTTINGEN
Worldwide there is a growing demand for animal products for human nutrition, despite vegan and vegetarian diets becoming more popular in Western countries. Changing diets necessitate a substantial amount of protein as an input for animal production. Future protein feedstuffs will need to become independent of arable land in order to avoid further land use changes, such as deforestation. The cultivation of insects as well as microalgae are up-and-coming sectors in Germany, as well as globally, to meet protein demands for humans and animals alike. Therefore, a research team at the University of Göttingen investigated whether these alternative protein sources alter typical meat quality. Their results have been published in the Journal of the Science of Food and Agriculture (JSFA).
In a study conducted as a part of the project "Sustainability Transitions in the Food Production", broiler chickens were fattened using feed with the main protein sources being soybean meal, spirulina, or insects. Animal growth, meat quality (especially concerning shelf life), and eating quality were investigated. Their results of laboratory testing and sensory (taste-testing) analyses across 132 birds show that black soldier fly larvae meal and spirulina can be included in poultry feed without negatively impacting quality. Chickens fed with black soldier fly larvae meal produce meat equivalent to the status quo. Chickens fed with spirulina produce meat with a more intensive colour and flavour. "Overall, both prove to be potential soybean meal alternatives in the search for new protein sources for animal feed," as explained by the study lead researcher Dr Brianne Altmann.
Microalgae are currently produced globally for biofuel, animal feed, and human consumption; however, they remain much more expensive than soybean meal. Currently in the European Union (EU), insects are only authorized for human consumption and for fish feed; they are likely to be approved for poultry feed in the near future. In the EU, all insects must be produced using certified animal feedstuffs. However, "sustainability necessitates the incorporation of waste products in the production of insects," explains Professor Daniel Mörlein, professor for the Quality of Animal Products.
Three groups at the Faculty of Agricultural Sciences, University of Göttingen, are currently examining the foundations for more sustainable and socially-accepted plant and animal-based foods. Product perception as well as consumer acceptance studies are commonly conducted in the faculty's modern sensory laboratory.
###
Original publication: Brianne A. Altmann, Ruth Wigger, Marco Ciulu, Daniel Mörlein: The effect of insect or microalga alternative protein feeds on broiler meat quality. (Journal of the Science of Food and Agriculture, open access). http://dx.doi.org/10.1002/jsfa.10473
Showing pro-diversity feelings are the norm makes individuals more tolerant
UNIVERSITY OF WISCONSIN-MADISON
MADISON, Wis. -- Showing people how their peers feel about diversity in their community can make their actions more inclusive, make members of marginalized groups feel more like they belong, and even help close racial achievement gaps in education, according to a new study.
Drawing on strategies that have worked in anti-smoking, safe-sex and energy-saving campaigns, University of Wisconsin-Madison researchers decided to try to change behavior by showing people that positive feelings about diversity are the norm.
"In any other domain of public health -- saving for retirement, sustainability, eating healthy -- it's the key thing to communicate: It's the right thing to do, your peers do it, and your peers would actually approve of you doing it as well," says Markus Brauer, the UW-Madison psychology professor whose lab designed the pro-diversity intervention.
It's an effect that's reflected in attitudes about ongoing protests over Black people killed by police officers. Exposed to larger crowds, more frequent news coverage and the opinions of friends and neighbors, more people have expressed support for Black Lives Matter groups and activities.
"People are heavily influenced by finding out what their peers have done," Brauer says. "But in the diversity domain, we haven't been trying this."
The researchers, who published their findings today in the journal Nature Human Behaviour, conducted extensive focus groups with UW-Madison students.
"We asked them -- students of color and white students, students of the LGBT+ community: What actually is it that decreases your sense of belonging? What are the kinds of behaviors that hurt your feelings, that make you feel excluded?" Brauer says. "And then please tell us, what are the behaviors that would make you feel welcome?"
The non-white students felt like they were kept at a distance from white students -- not included in class groups or projects, not included in activities, not invited to participate in simple interactions.
"When we asked about what decreased their sense of belonging, they didn't complain so much about racial slurs or explicit forms of discrimination," says Brauer. "It was the distance, the lack of interest, the lack of caring that affected them."
Brauer, graduate student Mitchell Campbell, and Sohad Murrar, a former graduate student of Brauer's who is now a psychology professor at Governors State University in Illinois, used what they learned to choose their messages.
"We used a social marketing approach, where we identify a target audience, we decide what our target behavior is, and then we show people how their peers support that behavior," Brauer says.
They designed a relatively simple poster, covered in students' faces and reporting actual survey results -- that 93 percent of students say they "embrace diversity and welcome people from all backgrounds into our UW-Madison community," and that 84 percent of them agreed to be pictured on the poster. They also produced a five-minute video, which described the pro-diversity opinions reported by large majorities in other campus surveys and showed real students answering questions about tolerance and inclusion.
In a series of experiments over several years, hundreds of students were exposed passively to the posters in brief encounters in study waiting rooms or hung day after day on the walls of their classrooms. In other experiments, the video was shown to an entire class during their first meeting. Control groups came and went from waiting rooms and classroom with no posters, or watched videos about cranberry production, or other alternatives to the study materials.
Then the researchers surveyed subjects to assess their attitudes about appreciation for diversity, attitudes toward people of color, intergroup anxiety, their peers' behaviors and other measures.
"When we measured 10 or 12 weeks later, the students who were exposed to the interventions report more positive attitudes towards members of other groups and stronger endorsement of diversity," Brauer says.
The differences for students from marginalized groups went further.
"The students belonging to marginalized groups tell us that they have an enhanced sense of belonging. They are less anxious in interactions with students from other ethnic groups. They tell us that they're less and less the target of discrimination," Brauer says. "They evaluate the classroom climate more positively, and feel that they are treated more respectfully by their classmates."
The researchers tested the effectiveness of their diversity intervention in a series of UW-Madison courses in which white students have historically received better grades than their non-white peers. In course sections that viewed the 5-minute video during their first meeting -- classes including more than 300 students -- the privileged and marginalized students' grades were equal in the end.
"We know the marginalized students experience discrimination; we know their feelings are valid. But we know, too, from the campus climate surveys and our own extensive surveys, that their fellow students report real appreciation for diversity, and tell us that they want to be inclusive," Brauer says. "They stay socially distant, though, because they worry about putting themselves out there. Our experience is that this intervention is changing those perceptions and experiences, and possibly the behavior, of both groups."
It may be the first result of its kind for such a long-running study with so many participants, and the researchers are hopeful that future work will help better reveal whether students actually change the way they treat each other.
"Promoting inclusion and dismantling systemic racism is one of the most important issues of our times. And yet, it turns out that many pro-diversity initiatives are not being evaluated," says Brauer, whose work was supported in part by funding from the office of UW-Madison's vice provost and chief diversity officer. "We really need evidence-based practices, but for a long time we've had no idea whether the things we do in the diversity domain actually have a beneficial effect. We're hoping to change that."
VIDEO: XROMM COMBINES CT SCANS OF A SKELETON WITH X-RAY VIDEO, AIDED BY TINY IMPLANTED METAL MARKERS, TO VISUALIZE HOW BONES AND MUSCLES MOVE INSIDE ANIMALS. view more
CREDIT: BROWN UNIVERSITY
PROVIDENCE, R.I. [Brown University] -- When picturing dinosaur tracks, most people imagine a perfectly preserved mold of a foot on firm layer of earth. But what if that dinosaur was running through mud, sinking several inches -- or even up to their ankles -- into the ground as it moved?
Using sophisticated X-ray-based technology, a team of Brown University researchers tracked the movements of guineafowl to investigate how their feet move below ground through various substrates and what those findings could mean for understanding fossil records left behind by dinosaurs.
They found that regardless of the variability in substrates, or the guineafowl moving at different speeds, sinking at different depths or engaging in different behaviors, the birds' overall foot movement remained the same: The toes spread as they stepped onto the substrate surface, remained spread as the foot sank, collapsed and drew back as they were lifted from the substrate, and exited the substrate in front of the point of entry, creating a looping pattern as they walked.
And part of what that means is that fossilized dinosaur tracks that look distinct from each other, and appear to be from different species, might instead come from the same dinosaurs.
"This is the first study that's really shown how the bird foot is moving below ground, showing the patterns of this subsurface foot motion and allowing us to break down the patterns that we're seeing in a living animal that has feet similar to those of a dinosaur," said Morgan Turner, a Ph.D. candidate at Brown in ecology and evolutionary biology and lead author of the research. "Below ground, or even above ground, they're responding to these soft substrates in a very similar way, which has potentially important implications for our ability to study the movement of these animals that we can't observe directly anymore."
The findings were published on Wednesday, July 1, in the Royal Society journal Biology Letters.
To make the observations, Turner and her colleagues, Professor of Biology and Medical Science Stephen Gatesy and Peter Falkingham, now at Liverpool John Moores University, used a 3D-imaging technology developed at Brown called X-ray Reconstruction of Moving Morphology (XROMM). The technology combines CT scans of a skeleton with high-speed X-ray video, aided by tiny implanted metal markers, to create visualizations of how bones and muscles move inside humans and animals. In the study, the team used XROMM to watch guineafowl move through substrates of different hydration and compactness, analyzing how their feet moved underground and the tracks left behind.
Sand, typically a dense combination of quartz and silica, does not lend itself well to X-ray imaging, so the team used poppy seeds to emulate sand. Muds were made using small glass bubbles, adding various amount of clay and water across 107 trials to achieve different consistencies and realistic tracks.
They added metal markers underneath the claws of the guineafowl to allow for tracking in 3D space. It's these claw tips that the researchers think are least disturbed by mud flow and other variables that can impact and distort the form of the track.
Despite the variation, the researchers observed a consistent looping pattern.
"The loops by themselves I don't think are that interesting," Gatesy said. "People are like, 'That's nice. Birds do this underground. So what?' It was only when [Turner] went back into it and said, 'What if we slice those motion trails at different depths as if they were footprints?' Then we made the nice connection to the fossils."
By "slicing" through the 3D images of the movement patterns at different depths, the researchers found similarities between the guineafowl tracks and fossilized dinosaur tracks.
"We don't know what these dinosaurs were doing, we don't know what they were walking through exactly, we don't know how big they were or how deep they were sinking, but we can make this really strong connection between how they were moving and some level of context for where this track is being sampled from within that movement," Turner said.
By recognizing the movement patterns, as well as the entry and exit point of the foot through various substrates, the team says they're able to gain a better understanding of what a dinosaur track could look like.
"You end up generating this big diversity of track shapes from a very simple foot shape because you're sampling at different depths and it's moving in complicated ways," Gatesy said. "Do we really have 40 different kinds of creatures, each with a differently shaped foot, or are we looking at some more complicated interaction that leaves behind these remnants that are partly anatomical and partly motion and partly depth?"
To further their research, the team spent time at the Beneski Museum of Natural History at Amherst College in Massachusetts, which is home to an expansive collection of penetrative tracks discovered in the 1800s by geologist Edward Hitchcock.
Hitchcock originally believed that his collection housed fossil tracks from over 100 distinct animals. Because of the team's work with XROMM, Gatesy now thinks it's possible that at least half of those tracks are actually from the same dinosaurs, just moving their feet in slightly different ways or sampled at slightly different depths.
"Going to museum together and being able to pick out these features and say, 'We think this track is low in the loop and we think this one is high,' that was the biggest moment of insight for me," Turner said.
Turner says she hopes their research can lead to a greater interest in penetrative tracks, even if they seem a little less pretty or polished than the tracks people are used to seeing in museums.
"They have so much information in them," Turner said, "and I hope that this gives people a lens, a new way to view these footprints and appreciate the movement preserved within in them."
###
This work was supported by the US National Science Foundation (EAR 1452119 to SMG and PLF; IOS 0925077 to SMG), a Marie Curie International Outgoing Fellowship within the 7th European Framework Programme to PLF, and the Bushnell Research and Education Fund to MLT.
Alarming long-term effects of insecticides weaken ant colonies
UNIVERSITY OF BERN
IMAGE: YOUNG COLONY OF THE BLACK GARDEN ANT (LASIUS NIGER) WITH QUEEN, WORKERS AND BROOD (EGGS, LARVAE AND PUPAE) IN A NESTING TUBE. view more
"Ants are one of the most important animal groups on our planet. However, they are also affected by the recently observed global declines in abundance and diversity of insects", says Daniel Schläppi of the Institute of Bee Health of the University of Bern, main author of the study. Evidence suggests that pesticides are among the factors responsible for the observed declines. "One problem of these substances is their persistence and the potential to contaminate soils and water, even in areas in which they are not applied", says co-author Gaétan Glauser from the University of Neuchâtel.
But so far, no data existed to show how exposure to low concentrations, which do not induce direct mortality, affect ants in the long run. The data, collected at the University of Bern in cooperation with Agroscope and the University of Neuchâtel, clearly demonstrate previously overlooked long-term effects, which are not detectable during the first year of colony development. The results are published in "Communications Biology", an Open-Access Journal of Nature. According to the authors, this study highlights the importance to develop sustainable agricultural practices that incorporate reduced use of agro-chemicals to prevent irreparable damages to natural ecosystems.
Worrying long-term impacts
Thiamethoxam has a clear negative impact on the health of ants. Thiamethoxam is a neonicotinoid insecticide used to combat pest insects that threaten our harvest. Unfortunately, there is more and more evidence showing that thiamethoxam and similar agro-chemicals have negative consequences for other beneficial insects, including ants and honey bees.
"With our study we show that ants, which play a very important roles in our ecosystems and provide valuable ecosystem services such as natural pest control, are negatively affected by neonicotinoids too", says Schläppi.
In the present work, colonies of black garden ants were chronically exposed to field realistic concentrations of thiamethoxam over 64 weeks. Colonies were raised in the laboratory from queens that were captured in the field. Before the first overwintering of the colonies no effect of neonicotinoid exposure on colony strength was visible. However, until the second overwintering it became apparent that colonies exposed to thiamethoxam were significantly smaller than control colonies. Because the number of workers is a very important factor for the success of an ant colony, the observed effects are most likely to compromise colony survivorship. Considering the important role of ants in natural ecosystems, our results indicate that neonicotinoids impose a threat to ecosystem functioning.
The call for sustainable solutions
"Accumulating long-term impact of neonicotinoids on ants is alarming", says Prof. Peter Neumann of the Institute of Bee Health at the University of Bern. "This is an exemplary study showing how negative effects of an environmental contaminant only become visible after long monitoring, but with potentially far reaching consequences". Therefore, the authors stress the importance to include ants as model organisms and to fully incorporate long-term effects in future risk assessment schemes for more sustainable agriculture.
###
This study was financially supported by the Béatrice Ederer-Weber Foundation, the Vinetum Foundation and the Swiss Federal Office for the Environment (FOEN). The research was conducted by scientist working at the University of Bern (Institute of Bee Health, Vetsuisse Faculty), Agroscope (Swiss Bee Research Centre) as well as University of Neuchâtel (Neuchâtel Platform of Analytical Chemistry).
Algae as living biocatalysts for a green industry
RUHR-UNIVERSITY BOCHUM
IMAGE: ALGAE HOLD GREAT POTENTIAL FOR ENVIRONMENTALLY FRIENDLY ENERGY PRODUCTION. view more
CREDIT: RUB, MARQUARD
Better still: living algae can be used as biocatalysts for certain substances, and they bring the co-substrate along, producing it in an environmentally friendly manner through photosynthesis. The team published its report in Algal Research on 17. June 2020.
It's a question of 3D structure
Many chemical substances in cosmetics, food or medicines can assume slightly different three-dimensional structures, with only one of them generating the desired fragrance or medical effect. The chemical production of the right substances is often not environmentally friendly, as it requires high temperatures or special solvents. In nature, however, certain proteins do exist that produce the required product at mild temperatures and in water. In the process, they often generate exactly the 3D structure of the substance that is needed by the industry.
These so-called old yellow enzymes, OYEs for short, owe their name to their naturally yellow colour. They occur in bacteria, fungi and plants, are in part well studied and offer considerable potential for a bio-based economy. However, they have one disadvantage: in order to carry out their reaction, they need the co-substrate NADPH (nicotinamide adenine dinucleotide phosphate). In living cells, this small molecule is generated through metabolic processes, whereas its chemical production is very expensive; as a result, the commercial use of OYEs is thwarted.
OYEs from unicellular green algae: two birds with one stone
The research team from Bochum has discovered several OYEs in unicellular green algae. "For a broad application, industry needs OYEs that can also produce unusual molecules," explains Professor Thomas Happe, Head of the Photobiotechnology research group at RUB. "Algae possess very complex metabolic pathways and are therefore ideal sources for novel biocatalysts." The researchers analysed algal OYEs in the test tube and showed that they are able to convert many commercially viable substances. "The exciting thing is that living algae can also carry out the reactions needed in the industry," points out PhD student Stefanie Böhmer, lead author of the study. "Since algae produce NADPH using photosynthesis, i.e. with sunlight, the co-substrate of the OYEs is supplied in an environmentally friendly and cost-effective way."
Promising collaboration
The authors point out that the study demonstrates the importance of the collaboration between researchers from different disciplines, and that the industry can be a valuable partner who initiates basic research. Four researches from the Research Training Group "Micon - Microbial substrate conversion", which is funded by the German Research Foundation, contributed their expertise to the study. The project was the brainchild of Solarbioproducts Ruhr, a spin-off established by Wirtschaftsförderungsgesellschaft Herne and Thomas Happe with the aim of developing concepts for environmentally friendly algae biotechnologies. "We have taken a big step towards a green industry," concludes Happe. "This would not have been possible without collaboration."
###
Funding
The study was funded by the German Research Foundation in the Research Training Group GRK 2341 Microbial Substrate Conversion Micon, the Chembiocat project funded by the Ministry of Innovation, Science and Research NRW, and Wirtschaftsförderungsgesellschaft Herne.
Original publication
Stefanie Böhmer, Christina Marx, Álvaro Gómez-Baraibar, Marc M. Nowaczyk, Dirk Tischler, Anja Hemschemeier, Thomas Happe: Evolutionary diverse Chlamydomonas reinhardtii old yellow enzymes reveal distinctive catalytic properties and potential for whole-cell biotransformations, in: Algal Research, 2020, DOI: 10.1016/j.algal.2020.101970
Typhoon changed earthquake patterns
Intensive erosion influenced seismicity
GFZ GEOFORSCHUNGSZENTRUM POTSDAM, HELMHOLTZ CENTRE
IMAGE: IMAGES FROM A SATELLITE (LANDSAT) SHOW MASSIVE EROSION AFTER THE TYPHOON MORAKOT HIT TAIWAN. THIS INFLUENCED SEISMICITY IN THE AFFECTED REGIONS. view more
CREDIT: NASA/LANDSAT
The Earth's crust is under constant stress. Every now and then this stress is discharged in heavy earthquakes, mostly caused by the slow movement of Earth's crustal plates. There is, however, another influencing factor that has received little attention so far: intensive erosion can temporarily change the earthquake activity (seismicity) of a region significantly. This has now been shown for Taiwan by researchers from the GFZ German Research Centre for Geosciences in cooperation with international colleagues. They report on this in the journal Scientific Reports.
The island in the western Pacific Ocean is ah the edge of the Asian continent. 11 years ago, Typhoon Morakot reached the coast of Taiwan. This trnyway one of the most tectonically active regions in the world, as the Philippine Sea Plate collides witopical cyclone is considered the one of the worst in Taiwan's recorded history.
Within only three days in August 2009, three thousand litres of rain fell per square metre. As a comparison, Berlin and Brandenburg receive an average of around 550 liters per square meter in one year. The water masses caused catastrophic flooding and widespread landsliding. More than 600 people died and the immediate economic damage amounted to the equivalent of around 3 billion euros.
The international team led by Philippe Steer of the University of Rennes, France, evaluated the earthquakes following this erosion event statistically. They showed that there were significantly more small-magnitude and shallow earthquakes during the 2.5 years after typhoon Morakot than before, and that this change occurred only in the area showing extensive erosion. GFZ researcher and senior author Niels Hovius says: "We explain this change in seismicity by an increase in crustal stresses at shallow depth, less than 15 kilometres, in conjunction with surface erosion". The numerous landslides have moved enormous loads, rivers transported the material from the devastated regions. "The progressive removal of these loads changes the state of the stress in the upper part of the Earth's crust to such an extent that there are more earthquakes on thrust faults," explains Hovius.
So-called active mountain ranges, such as those found in Taiwan, are characterized by "thrust faults" in the underground, where one unit of rocks moves up and over another unit. The rock breaks when the stress becomes too great. Usually it is the continuous pressure of the moving and interlocking crustal plates that causes faults to move. The resulting earthquakes in turn often cause landslides and massively increased erosion. The work of the GFZ researchers and their colleagues now shows for the first time that the reverse is also possible: massive erosion influences seismicity - and does so in a geological instant. Niels Hovius: "Surface processes and tectonics are connected in the blink of an eye." The researcher continues: "Earthquakes are among the most dangerous and destructive natural hazards. Better understanding earthquake triggering by tectonics and by external processes is crucial for a more realistic assessment of earthquake hazards, especially in densely populated regions."
###
Original study: Steer, P. et al. "Earthquake statistics changed by typhoon-driven erosion"; Scientific Reports; DOI: 10.1038/s41598-020-67865-y
Science fiction becomes fact -- Teleportation helps to create live musical performance
UNIVERSITY OF PLYMOUTH
IMAGE: DR ALEXIS KIRKE (RIGHT) AND SOPRANO JULIETTE POCHIN DURING THE FIRST DUET BETWEEN A LIVE SINGER AND A QUANTUM SUPERCOMPUTER view more
CREDIT: UNIVERSITY OF PLYMOUTH
Teleportation is most commonly the stuff of science fiction and, for many, would conjure up the immortal phrase "Beam me up Scotty".
However, a new study has described how its status in science fact could actually be employed as another, and perhaps unlikely, form of entertainment - live music.
Dr Alexis Kirke, Senior Research Fellow in the Interdisciplinary Centre for Computer Music Research at the University of Plymouth (UK), has for the first time shown that a human musician can communicate directly with a quantum computer via teleportation.
The result is a high-tech jamming session, through which a blend of live human and computer-generated sounds come together to create a unique performance piece.
Speaking about the study, published in the current issue of the Journal of New Music Research, Dr Kirke said: "The world is racing to build the first practical and powerful quantum computers, and whoever succeeds first will have a scientific and military advantage because of the extreme computing power of these machines. This research shows for the first time that this much-vaunted advantage can also be helpful in the world of making and performing music. No other work has shown this previously in the arts, and it demonstrates that quantum power is something everyone can appreciate and enjoy."
Quantum teleportation is the ability to instantaneously transmit quantum information over vast distances, with scientists having previously used it to send information from Earth to an orbiting satellite over 870 miles away.
In the current study, Dr Kirke describes how he used a system called MIq (Multi-Agent Interactive qgMuse), in which an IBM quantum computer executes a methodology called Grover's Algorithm.
Discovered by Lov Grover at Bell Labs in 1996, it was the second main quantum algorithm (after Shor's algorithm) and gave a huge advantage over traditional computing.
In this instance, it allows the dynamic solving of musical logical rules which, for example, could prevent dissonance or keep to ¾ instead of common time.
It is significantly faster than any classical computer algorithm, and Dr Kirke said that speed was essential because there is actually no way to transmit quantum information other than through teleportation.
The result was that when played the theme from Game of Thrones on the piano, the computer - a 14-qubit machine housed at IBM in Melbourne - rapidly generated accompanying music that was transmitted back in response.
Dr Kirke, who in 2016 staged the first ever duet between a live singer and a quantum supercomputer, said: "At the moment there are limits to how complex a real-time computer jamming system can be. The number of musical rules that a human improviser knows intuitively would simply take a computer too long to solve to real-time music. Shortcuts have been invented to speed up this process in rule-based AI music, but using the quantum computer speed-up has not be tried before. So while teleportation cannot move information faster than the speed of light, if remote collaborators want to connect up their quantum computers - which they are using to increase the speed of their musical AIs - it is 100% necessary. Quantum information simply cannot be transmitted using normal digital transmission systems."
###
Prospective teachers misperceive Black children as angry
Study findings suggest ramifications for Black youth
AMERICAN PSYCHOLOGICAL ASSOCIATION
Prospective teachers appear more likely to misperceive Black children as angry than white children, which may undermine the education of Black youth, according to new research published by the American Psychological Association.
While previous research has documented this effect in adults, this is the first study to show how anger bias based on race may extend to teachers and Black elementary and middle-school children, said lead researcher Amy G. Halberstadt, PhD, a professor of psychology at North Carolina State University. The study was published online in the APA journal Emotion.
"This anger bias can have huge consequences by increasing Black children's experience of not being 'seen' or understood by their teachers and then feeling like school is not for them," she said. "It might also lead to Black children being disciplined unfairly and suspended more often from school, which can have long-term ramifications."
In the study, 178 prospective teachers from education programs at three Southeastern universities viewed short video clips of 72 children ages 9 to 13 years old. The children's faces expressed one of six basic emotions: happiness, sadness, anger, fear, surprise or disgust. The clips were evenly divided among boys or girls and Black children or white children. The sample was not large enough to determine whether the race or ethnicity of the teachers made a difference in how they perceived the children.
The prospective teachers were somewhat accurate at detecting the children's emotions, but they also made some mistakes that revealed patterns. Boys of both races were misperceived as angry more often than Black or white girls. Black boys and girls also were misperceived as angry at higher rates than white children, with Black boys eliciting the most anger bias.
Anger bias against Black children can have many negative consequences. While controlling for other factors, previous research has found that Black children are three times more likely to be suspended or expelled from school than white children. Black children's negative experiences at school also could contribute to the disparate achievement gap between Black and white youth that has been documented across the United States, Halberstadt said.
Those in the study also completed questionnaires relating to their implicit and explicit racial bias, but their scores on those tests didn't affect the findings relating to Black children. However, those who displayed greater racial bias were less likely to misperceive white children as angry.
"Even when people are motivated to be anti-racist, we need to know the specific pathways by which racism travels, and that can include false assumptions that Black people are angry or threatening," Halberstadt said. "Those common racist misperceptions can extend from school into adulthood and potentially have fatal consequences, such as when police officers kill unarmed Black people on the street or in their own homes."
Previous research with adults in the United States has found that anger is perceived more quickly than happiness in Black faces, while the opposite effect was found for white faces. Anger also is perceived more quickly and for a longer time in young Black men's faces than young white men's faces.
"Over the last few weeks, many people are waking up to the pervasive extent of systemic racism in American culture, not just in police practices but in our health, banking and education systems," Halberstadt said. "Learning more about how these problems become embedded in our thought processes is an important first step."
Participants in the study were predominantly female (89%) and white (70%), mirroring the gender and race of most public-school teachers across the country. The study didn't include enough people of color from any single race or ethnicity (Hispanic 9%, Asian 8%, Black 6%, Biracial 5%, Native American 1%, and Middle Eastern 1%) to analyze separate findings based on the race or ethnicity of the participants.
###
Article: "Racialized Emotion Recognition Accuracy and Anger Bias of Children's Faces," by Amy G. Halberstadt, PhD, Alison N. Cooke, PhD, Dejah Oertwig, MA, and Shevaun D. Neupert, PhD, North Carolina State University; Sherick Hughes, PhD, University of North Carolina-Chapel Hill; and Pamela W. Garner, PhD, George Mason University, Emotion, published online July 2, 2020.
The American Psychological Association, in Washington, D.C., is the largest scientific and professional organization representing psychology in the United States. APA's membership includes nearly 121,000 researchers, educators, clinicians, consultants and students. Through its divisions in 54 subfields of psychology and affiliations with 60 state, territorial and Canadian provincial associations, APA works to advance the creation, communication and application of psychological knowledge to benefit society and improve people's lives.
