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Move over Olympians, Australia’s wildlife are incredible athletes

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Move over Olympians, Australia’s wildlife are incredible athletes


kangaroos jumping
Credit: Pixabay/CC0 Public Domain

Now that the Paris Olympics and Paralympics have disappeared from our screens, let’s get back to watching animal videos.

But seriously, have you ever paused to think about the athletic abilities of Australian wildlife?

In my research as an ecologist, I’m constantly amazed by the strength, speed and resilience of our native animals. Their prowess is testament to the wonders of evolution, and the necessity of species having to adapt to challenging and changing environments in order to survive.

Let’s take a closer look at some of our best competitors and how might they fare, against humans and overseas entrants. On your marks, get set… swim, hop, dig, dance, glide!

Swimming

Australians are renowned for being strong swimmers. But what is the fastest swimmer in the animal kingdom?

On this there is much debate. Some suggest it’s the Indo Pacific sailfish, clocking in at about 30km/hr. That’s impressive, but much slower than oft-cited (but inaccurate) claims it can travel at more than 100km/hr.

For perspective, the fastest human to swim the 50 meters freestyle is American Caeleb Dressel, completing this in a time of 20.16 seconds. That’s roughly 9km/h—faster than many people jog, but still no match for a sailfish.

As in humans, swimming speed in fishes tends to increase with body length. Larger species that challenge sailfish for the fastest swimmer title include blue or black marlin. Shorter, torpedo-like bluefin tuna are also in contention. All are found in Australian waters, though not exclusively.






While American swimmer Michael Phelps put in an impressive showing against a simulated great white shark, no human would beat much faster sailfish, marlin and tuna.

Sprinting, long and high jump

Aussie icons, red kangaroos can reach speeds of around 60-70km/hr. But they are no match for cheetahs, which can move at more than 120km/hr.

Long jump is surely the kangaroo’s main event. Red kangaroos can jump a staggering 13 meters or more. Amazingly, this might not be enough to clinch gold. Snow leopards can jump more than 15 meters.

Kangaroos can clear heights of up to 3m, so would perform well in the high jump. But they’d finish behind bottlenose dolphins, which can jump over 7m in the air, just for kicks.

Scaled for body size, though, both species would be embarrassed by a tiny insect known as a froghopper. It jumps to heights of more than 140 times its body length.






Kangaroos sure can jump, but they’re not the greatest of all in the animal kingdom.

Battles of strength

African elephants can lift more than 1,000kg and weaver ants more than 100 times their own body weight.

But relative to size, a truly impressive champion is Australia’s horned dung beetle. At just a centimeter long, these diminutive powerhouses can pull more than 1,100 times their own body weight, roughly equating to an average man lifting two fully-loaded 18-wheeler trucks.

And yet, horned dung beetles might still only claim silver. Another invertebrate Aussie, the tiny tropical moss mite, is perhaps the world’s strongest animal. It can pull more than 1,180 times its weight.






Bigger does not always equal stronger.

Packing the fastest, deadliest punch

In terms of combat sports, bigger is not always better.

Peacock mantis shrimps—invertebrates found in Australian marine waters and elsewhere—have the swiftest and most powerful punch in the lightweight crustacean division.

They kill prey by punching them with strong, club-like appendages. They deliver blows at up to 23m per sec, akin to the speed and force of a .22 caliber bullet being fired.

So powerful is the punch, it vaporizes water and creates a super-hot shockwave that breaks up and incapacitates its prey.






Nature’s deadliest punch?

Tantalizing contests

What about a digging contest? Eastern barred bandicoots can shift 4.8 tons of soil a year. How would that stack up against marsupial moles, which can disappear almost instantly into desert sands? Or the expert excavations of wombats and aardvarks that can dig more than half a meter in 15 seconds?

In terms of free-diving and flying, there’s really no contest. Cuvier’s beaked whale can dive nearly 3000m and peregrine falcons can reach over 320 km/hr. These animals are found across the globe, however—not just in Australia.

Australia’s largest gliding marsupial, the greater glider, can sail up to 100m between trees. But gliding gold would surely go to the giant flying squirrel, which can glide up to 450m.

I’d love to see a shooting contest between Australia’s archer fish and Madagascar’s panther chameleon. But finding the right arena for both aquatic and land-based sharpshooters would be tricky.

Raygun’s kangaroo hop is now legendary, but a breaking (break dancing) contest between a peacock spider, spanish dancer (a type of nudibranch) and a magnificent riflebird might genuinely break the internet.

Appreciating wildlife athletes

So who would win a global contest for the best wildlife athlete overall?

If the competition was on land and focused on running, jumping, strength and climbing, it’s hard to go past the overall abilities of a Bengal tiger.

Many amazing wildlife athletes are threatened with extinction. Others are gone forever.

They include the incredible oolacunta—also known as the desert rat kangaroo. It’s powers of endurance in the desert are the stuff of folklore. As legendary Australian mammalogist Hedley Herbert Finlayson wrote in 1931:

“Its speed for such an atom, was wonderful, and its endurance amazing … when we finally got it, it had taken the starch out of three mounts and run us 12 miles; all under such adverse conditions of heat and rough going, as to make it almost incredible that so small a frame should be capable of such an immense output of energy.”

Let’s celebrate wildlife and their athletic abilities and ensure they have a secure future.

Provided by
The Conversation


This article is republished from The Conversation under a Creative Commons license. Read the original article.The Conversation

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Move over Olympians, Australia’s wildlife are incredible athletes (2024, September 23)
retrieved 23 September 2024
from https://phys.org/news/2024-09-olympians-australia-wildlife-incredible-athletes.html

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Researchers enhance efficiency of small electric drives for pumps and fans

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Researchers enhance efficiency of small electric drives for pumps and fans


Researchers at TU Graz improve small electric drives
Brushless integrated drives have been optimized in terms of efficiency, noise, weight and costs. Credit: Lunghammer—TU Graz

Small electric motors can be found in many household appliances, tools and computers as well as in modern cars, where they drive auxiliary units such as pumps and fans. Individually, each of these motors does not consume much energy, but taken together they offer a great savings potential.

The research team of the recently completed “CD Laboratory for Brushless Drives for Pump and Fan Applications”, headed by Annette Mütze from the Electric Drives and Power Electronic Systems Institute at Graz University of Technology (TU Graz), has now further tapped into this potential. Thanks to innovative design, modified control technology and the use of new manufacturing techniques, the brushless integrated drives developed here consume less energy, operate more quietly and are lighter.

Slanted claws reduce vibrations

Larger claw pole motors are used in vehicle lighting systems, for example. Their use as small drive units is less well known. Mütze’s team has reduced the so-called “cogging torques” of these small drives by skewing and slotting the claws, which does not incur any additional costs. This minimizes the momentary engagement of the claws when the motor is turned, thus reducing unwanted vibrations.

“This enabled us to reduce an important source of noise by 70%. This means that the drives run much more smoothly and quietly,” says Mütze.

Simplified control reduces switching losses

Efficiency gains are achieved through simplified regulation of the current flow. Pulse width modulation usually regulates the current with which the motor of a fan or pump is supplied. In order for the current to flow in the desired rectangular pattern, a large number of switching operations are required, which, however, cause additional energy consumption.

“We only switch our drives on and off once per desired rectangle,” says Mütze. “This enabled us to considerably reduce the additional energy consumption caused by switching losses.”

Particularly at low currents, these drives therefore have a much better overall efficiency than those that are controlled via conventional pulse width modulation. Due to the drastically reduced number of switching operations, the circuit boards of the motors also require half as many capacitors, which reduces costs.

3D printing of ferrite-based material

The third innovation is the implementation of PCB motors with ferrite cores. “PCB” stands for “printed circuit board” and, in the case of motors, means that the windings that generate the magnetic field required for the drive are designed as printed circuit boards. This allows a high degree of automation in production.

Mütze’s team equipped the circuit boards with 3D-printed ferrite cores, which improved the guidance of the magnetic flux in the motors. This was the prerequisite for the use of more cost-effective magnets, which are also based on ferrite.

Citation:
Researchers enhance efficiency of small electric drives for pumps and fans (2024, September 23)
retrieved 23 September 2024
from https://techxplore.com/news/2024-09-efficiency-small-electric-fans.html

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Low gravity in space travel found to weaken and disrupt normal rhythm in heart muscle cells

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Low gravity in space travel found to weaken and disrupt normal rhythm in heart muscle cells


Low gravity in space travel found to weaken and disrupt normal rhythm in heart muscle cells
Heart tissues within one of the launch-ready chambers. Credit: Jonathan Tsui

Johns Hopkins Medicine scientists who arranged for 48 human bioengineered heart tissue samples to spend 30 days at the International Space Station report evidence that the low gravity conditions in space weakened the tissues and disrupted their normal rhythmic beats when compared to Earth-bound samples from the same source.

The scientists said the heart tissues “really don’t fare well in space,” and over time, the tissues aboard the space station beat about half as strongly as tissues from the same source kept on Earth.

The findings, they say, expand scientists’ knowledge of low gravity’s potential effects on astronauts’ survival and health during long space missions, and they may serve as models for studying heart muscle aging and therapeutics on Earth.

A report of the scientists’ analysis of the tissues is published in the Proceedings of the National Academy of Sciences.

Previous studies showed that some astronauts return to Earth from outer space with age-related conditions, including reduced heart muscle function and arrythmias (irregular heartbeats), and that some—but not all—effects dissipate over time after their return.

But scientists have sought ways to study such effects at a cellular and molecular level in a bid to find ways to keep astronauts safe during long spaceflights, says Deok-Ho Kim, Ph.D., a professor of biomedical engineering and medicine at the Johns Hopkins University School of Medicine. Kim led the project to send heart tissue to the space station.

To create the cardiac payload, scientist Jonathan Tsui, Ph.D. coaxed human induced pluripotent stem cells (iPSCs) to develop into heart muscle cells (cardiomyocytes). Tsui, who was a Ph.D. student in Kim’s lab at the University of Washington, accompanied Kim as a postdoctoral fellow when Kim moved to Johns Hopkins University in 2019. They continued the space biology research at Johns Hopkins.

Tsui then placed the tissues in a bioengineered, miniaturized tissue chip that strings the tissues between two posts to collect data about how the tissues beat (contract). The cells’ 3D housing was designed to mimic the environment of an adult human heart in a chamber half the size of a cell phone.

To get the tissues aboard the SpaceX CRS-20 mission, which launched in March 2020 bound for the space station, Tsui says he had to hand-carry the tissue chambers on a plane to Florida, and continue caring for the tissues for a month at the Kennedy Space Center. Tsui is now a scientist at Tenaya Therapeutics, a company focused on heart disease prevention and treatment.

Once the tissues were on the space station, the scientists received real-time data for 10 seconds every 30 minutes about the cells’ strength of contraction, known as twitch forces, and on any irregular beating patterns. Astronaut Jessica Meir, Ph.D., M.S. changed the liquid nutrients surrounding the tissues once each week and preserved tissues at specific intervals for later gene readout and imaging analyses.

The research team kept a set of cardiac tissues developed the same way on Earth, housed in the same type of chamber, for comparison with the tissues in space.

When the tissue chambers returned to Earth, Tsui continued to maintain and collect data from the tissues.

“An incredible amount of cutting-edge technology in the areas of stem cell and tissue engineering, biosensors and bioelectronics, and microfabrication went into ensuring the viability of these tissues in space,” says Kim, whose team developed the tissue chip for this project and subsequent ones.

Devin Mair, Ph.D., a former Ph.D. student in Kim’s lab and now a postdoctoral fellow at Johns Hopkins, then analyzed the tissues’ ability to contract.

In addition to losing strength, the heart muscle tissues in space developed irregular beating (arrhythmias)—disruptions that can cause a human heart to fail. Normally, the time between one beat of cardiac tissue and the next is about a second. This measure, in the tissues aboard the space station, grew to be nearly five times longer than those on Earth, although the time between beats returned nearly to normal when the tissues returned to Earth.

The scientists also found, in the tissues that went to space, that sarcomeres—the protein bundles in muscle cells that help them contract—became shorter and more disordered, a hallmark of human heart disease.

In addition, energy-producing mitochondria in the space-bound cells grew larger, rounder and lost the characteristic folds that help the cells use and produce energy.

Finally, Mair, Eun Hyun Ahn, Ph.D.—an assistant research professor of biomedical engineering—and Zhipeng Dong, a Johns Hopkins Ph.D. student, studied the gene readout in the tissues housed in space and on Earth. The tissues at the space station showed increased gene production involved in inflammation and oxidative damage, also hallmarks of heart disease.

“Many of these markers of oxidative damage and inflammation are consistently demonstrated in post-flight checks of astronauts,” says Mair.

Kim’s lab sent a second batch of 3D engineered heart tissues to the space station in 2023 to screen for drugs that may protect the cells from the effects of low gravity. This study is ongoing, and according to the scientists, these same drugs may help people maintain heart function as they get older.

The scientists are continuing to improve their “tissue on a chip” system and are studying the effects of radiation on heart tissues at the NASA Space Radiation Laboratory. The space station is in low Earth orbit, where the planet’s magnetic field shields occupants from most of the effects of space radiation.

More information:
Kim, Deok-Ho, Spaceflight-induced contractile and mitochondrial dysfunction in an automated heart-on-a-chip platform, Proceedings of the National Academy of Sciences (2024). DOI: 10.1073/pnas.2404644121. doi.org/10.1073/pnas.2404644121

Citation:
Low gravity in space travel found to weaken and disrupt normal rhythm in heart muscle cells (2024, September 23)
retrieved 23 September 2024
from https://phys.org/news/2024-09-gravity-space-weaken-disrupt-rhythm.html

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Swedish battery maker Northvolt to slash 1,600 jobs, quarter of staff

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Swedish battery maker Northvolt to slash 1,600 jobs, quarter of staff


Northvolt Ett factory in Skelleftea will see 1,000 jobs cut as part of cost savings plan by the Swedish company
Northvolt Ett factory in Skelleftea will see 1,000 jobs cut as part of cost savings plan by the Swedish company.

Sweden’s beleaguered electric car battery maker Northvolt said Monday it would cut a quarter of its staff in the country, as it struggles with strained finances and a slowdown in demand.

The loss of 1,600 jobs in Sweden comes as electric car sales slump in Europe and the continent lags far behind China in battery production.

“While overall momentum for electrification remains strong, we need to make sure that we take the right actions at the right time in response to headwinds in the automotive market, and wider industrial climate,” Northvolt CEO Peter Carlsson said in a statement.

He added that Northvolt needed to “focus all energy and investments into our core business.”

Northvolt, which warned on September 9 that cuts were coming, said that following “initial steps” of a strategic review it estimated that proposed cost-saving measures would result in about 1,000 redundancies at its primary Skelleftea plant—where an expansion project would be suspended.

The company had intended to expand the capacity of the facility to provide an annual output of 30 GWh, but will now focus on ramping up to 16 GWh.

In July, it said it hoped to reach an annual production of over one GWh this year—still far from the facility’s capacity.

One GWh is enough to equip 20,000 average sized cars.

“Success in the ramp-up of production at Northvolt Ett is critical for delivering to our customers and enabling sustainable business operations,” Carlsson said in a statement.

Another 400 positions would be cut in the city of Vasteras and 200 in the Swedish capital Stockholm.

“The rescoping of operations is critical to ensure a sustainable operation and cost base,” Northvolt said.

It added that “to achieve this a workforce reduction of approximately 20 percent at a global level, and 25 percent in Sweden is required.”

Cornerstone

The company employs 6,500 people, according to its website.

Northvolt has been seen as a cornerstone of European attempts to catch up with China and the United States in the production of battery cells, a crucial component of lower-emission cars.

Europe accounts for just three percent of global battery cell production, but has set its sights on 25 percent of the market by the end of the decade.

But the battery maker has also been plagued by production delays, which in May led BMW to drop an order worth 2 billion euros ($2.2 billion).

Northvolt still reports to have contracts worth $55 billion with customers such as Scania, Volvo and Volkswagen.

Volkswagen is also Northvolt’s largest shareholder, with a 21 percent stake.

Production delays and lower demand from automotive customers have led to a rapidly deteriorating financial situation, which accelerated at the end of the summer, according to the business daily Dagens Industri.

According to Swedish media reports, Northvolt is trying to organize a new share issue to raise 7.5 billion kronor.

The battery maker has also faced scrutiny in Sweden over concerns about work safety at its sites, with Swedish police currently investigating a number of unexplained deaths of factory workers, who died after working at the plant in Skelleftea.

In mid-September, Swedish Prime Minister Ulf Kristersson said that “there are no plans for the Swedish state to become a part owner of Northvolt or anything like that”.

Since its creation, the Swedish company has secured $15 billion of credit and capital.

© 2024 AFP

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Swedish battery maker Northvolt to slash 1,600 jobs, quarter of staff (2024, September 23)
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Study of four crane species reveals complicated relationships between birds and their environments

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Study of four crane species reveals complicated relationships between birds and their environments


How cranes navigate their complex world
An adult white-naped crane affixed with unique color bands to identify the individual in Mongolia. Credit: Wildlife Science and Conservation Center (WSCC) of Mongolia

Knowing how animals use their environments to survive and thrive is a key challenge for predicting how global climate change will affect wildlife. A global collaborative study of four species of crane has shed light on the way that migrations are finely tuned to unpredictable and complex environments.

A team from 10 countries combined novel animal tracking technology, remote-sensed information about the environment, and a new statistical framework to gain insight into four iconic species: common cranes, white-naped cranes, black-necked cranes, and demoiselle cranes.

The study, led by scientists from the Max Planck Institute of Animal Behavior and Yale University, was published in Proceedings of the National Academy of Sciences on September 23.

The researchers used tiny GPS tracking devices to follow the movements of 104 cranes in Africa, Asia, and Europe. These devices included unique solar-powered GPS leg bands developed by scientists from MPI-AB. The tracking data revealed the impressive migrations that cranes undertook.

Some of the migratory routes exceeded 6,400 km of travel round trip and required crossing barriers such as the Alps or Himalaya mountain ranges, the deserts of the Arabian peninsula, or the Mediterranean Sea.

In addition to the tracking study, the researchers also developed a statistical framework that revealed how the cranes’ movements relate to aspects of the environment, such as the presence of crops or water bodies nearby, and the temperature and vegetation cover on the land.

“Animals have to satisfy their own needs with what they can get from their environment, but both of these are changing constantly,” says Scott Yanco, first author on the study and a postdoctoral researcher at the University of Michigan.

“This creates an intriguing optimization problem that we wanted to know if cranes were solving through long-distance migration.”

The researchers found that all four crane species experienced starkly different environmental conditions over a year, and that these periods were synchronized with important events in their lives. This was particularly pronounced when comparing temperatures or resource availability on wintering and summer breeding grounds.

For some, the migrations themselves entailed huge shifts in environmental conditions. For example, the demoiselle cranes migrated across the Tibetan plateau and had to contend with massive fluctuations in temperature while doing so.

“We suspect this all has to do with different biological needs during these different times of the year,” adds Yanco, who did the research when he was at the Yale Center for Biodiversity and Global Change. For example, common cranes clearly emphasized agricultural areas during the late summer, a period that aligns with raising juveniles and preparing for fall migration.

“This is exactly when we would expect them to want easy access to food,” he says.

For other species, access to food may come at a cost. The black-necked cranes in the study had to decide between safe roosting habitat and abundant resources.

“Amazingly, the balance between these competing needs changed over the year depending on what the birds were doing,” adds Yanco. During migration they opted for safer roosting conditions, whereas during breeding they leaned towards abundant food.

“This type of shifting emphasis depending on what cranes need at any given time is what we were expecting to see,” says Ivan Pokrovsky, a postdoctoral researcher at MPI-AB and last author on the study.

“But we were blown away by how well the cranes used movement to resolve trade-offs among competing needs and to access certain environments during key periods of the year.”

Understanding how animals interact with their surroundings not only gives us a more nuanced view of how they survive in complex environments—it is crucial for developing policy and management actions to address the dual crises of climate change and biodiversity loss, the authors say.

The study’s framework offers a statistical tool for understanding the complicated relationships between animals and their environments that can be widely applied to conservation and management efforts of wildlife.

“When we know how animals use certain environmental conditions, we can make better predictions about how species might respond to human-caused global change and develop more effective interventions that ensure we preserve the conditions species need to survive,” says Pokrovsky.

More information:
Scott W. Yanco et al, Migratory birds modulate niche tradeoffs in rhythm with seasons and life history, Proceedings of the National Academy of Sciences (2024). DOI: 10.1073/pnas.2316827121

Provided by
Max Planck Society


Citation:
Study of four crane species reveals complicated relationships between birds and their environments (2024, September 23)
retrieved 23 September 2024
from https://phys.org/news/2024-09-crane-species-reveals-complicated-relationships.html

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part may be reproduced without the written permission. The content is provided for information purposes only.





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