Showing posts with label Science and Nature. Show all posts
Showing posts with label Science and Nature. Show all posts

Tuesday, 18 January 2022

The End is Nigh? Sixth Mass Extinction on Earth Underway, Study Warns

 

The End is Nigh? Sixth Mass Extinction on Earth Underway, Study Warns

Earth, Sun - Sputnik International, 1920, 15.01.2022

Last year, scientists claimed in a study that at least 500 species of mammals, birds, reptiles, and amphibians had already been pushed to the brink of extinction due to human activities like logging and poaching.
It appears that the worst-case scenario about the end of the world may finally see the light of day given that there's already evidence of the sixth mass extinction event currently being underway on Earth, a new study has claimed.
The research, which was recently published in the journal Biological Reviews, is the work of biologists from the University of Hawaii's Manoa Pacific Biosciences Research Centre with the School of Ocean and Earth Science and Technology (SOEST), in cooperation with the Muséum National d’Histoire Naturelle in Paris, France. The scientists suggested that the sixth mass extinction crisis is underway as our planet is being ravaged by floods and rising sea levels due to human pollution.

Robert Cowie, lead author of the study and research professor at SOEST, pointed to the "drastically increased rates of species extinctions and declining abundances of many animal and plant populations", which he said "are well documented".

Yet, he added, that "some" continue to deny that "these phenomena amount to mass extinction".
The professor explained that this denial is based on "a biased view of the crisis which focuses on mammals and birds and ignores invertebrates, which of course constitute the great majority of biodiversity". According to him, "including invertebrates was key to confirming that we are indeed witnessing the onset of the sixth mass extinction in Earth's history".
The researcher singled out "massive anecdotal reports and scientific studies" indicating that "Earth's biota is well into the sixth mass extinction".
 Artist's impression of an asteroid hitting Earth - Sputnik International, 1920, 21.07.2021
Asteroid That Killed Dinosaurs Also Caused Mile-High Tsunami, Scientists Say

"Although there is some debate about the causes of the previous five mass extinction events, there's none at all in the scientific community about the cause of the ongoing sixth — too many people and the richer of them consuming much too much, all exacerbated by gender, racial, and economic inequity", Cowie asserted.


https://sputniknews.com/20220115/the-end-is-nigh-sixth-mass-extinction-on-earth-underway-study-warns-1092279378.html

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Sunday, 16 January 2022

Guinea-Bissau turtle hatchery addresses unusual problem of too many eggs

 

Guinea-Bissau turtle hatchery addresses unusual problem of too many eggs

Guinea-Bissau turtle hatchery addresses unusual problem of too many eggs
  • Five percent of all green sea turtles nest on the beaches of tiny Poilão Island, in the Bijagós Archipelago off Guinea-Bissau, leading to some nests being laid on top of each other.
  • Sea turtle monitors are rescuing these “doomed clutches” of eggs and relocating them to less crowded beaches.
  • In the future, they hope the sea turtle hatchery will provide educational opportunities that strengthen protection of sea turtles.

POILÃO ISLAND, Guinea-Bissau — On a moonlit night in September, hundreds of sea turtles have crawled out of the sea to nest on Poilão Island. A team of turtle monitors from Guinea-Bissau’s National Institute of Biodiversity and Protected Areas (IBAP) have dug a large hole of their own in the sand at one end of their temporary camp a few meters back from the beach.

The monitors are rescuing eggs from “doomed clutches,” where a turtle has laid her clutch on top of an existing one, and there’s a risk that when the deeper-lying babies hatch, they’ll ruin the eggs still incubating in the nest above them.

The monitors’ nest next to the tents is only a temporary resting place. In the morning, they will gingerly place the eggs in a bucket and transfer them to nearby João Vieira Island, where they will be safely buried again and monitored daily by IBAP staff.

João Vieira and Poilão are two of the four islands off the coast of Guinea-Bissau that make up João Vieira-Poilão Marine National Park. They’re part of the 88-island Bijagós Archipelago, the most important sea turtle breeding ground in Africa.

Monitors rescuing turtle eggs from “doomed clutches.” Image by Ricci Shryock for Mongabay.

Around 5% of the global green sea turtle (Chelonia mydas) population nests on Poilão, a tiny, 43-hectare (106-acre) island, the southernmost in the archipelago.

Because so many turtles come to these beaches to lay their eggs, nests are sometimes laid on top of each other.

So researchers from IBAP decided to try and rescue some of these threatened nests from both Poilão and nearby Meio Island.

“Since there were a lot of nests that were ruined, we thought it was better not to leave the eggs that are ruined. We thought, what can we do to save these nests?” says Castro Barbosa, head of sea turtle monitoring for IBAP.

At some nesting sites, like those in Cabo Verde, about 500 kilometers (300 miles) northwest of the Bijagós, many clutches are threatened by predators or high tides, so hatcheries are an important conservation tool, according to Rita Patrício, a sea turtle researcher with Lisbon’s Instituto Superior de Psicologia Aplicada and the University of Exeter in the U.K., who has been working with IBAP for more than a decade.

“In the Bijagós, this is not the case, as most clutches are safe from flooding and predation at Poilão. So the hatchery is more like an experiment, and potentially can be used for education purposes, ecotourism, and also eventually the IBAP might start translocations of eggs from Poilão — where there are too many. This could be good in the future, so that the nesting is more broadly distributed.”

Because so many turtles come to these beaches to lay their eggs, nests are sometimes laid on top of each other. Image by Ricci Shryock for Mongabay.

In 2019, IBAP set up a pilot hatchery on João Vieira. But the beach they moved the rescued clutches to was later flooded, and none survived. The next year, they moved 20 nests and had a 68% survival rate.

Castro said the hatchery will not only help increase the number of sea turtles that survive, but also hopefully become an educational opportunity for students in the country.

“We started to reflect, how can we teach children about these turtles? There are a lot of people who don’t know anything about turtles.”

To reach the nesting beaches on Poilão, the remotest of the Bijagós Islands, one has to cross the rough, open sea. João Vieira is easier to access, and Castro said IBAP hopes to eventually bring students to see the nesting and hatching process eventually.

He said he hopes that increased education about sea turtles will reinforce the importance of protecting these islands and the turtles that return to these vital nesting grounds.

‘I FEEL OBLIGATED TO PROTECT THEM’: A LIFELONG LOVE AFFAIR WITH GUINEA-BISSAU’S TURTLES


 https://southafricatoday.net/environment/guinea-bissau-turtle-hatchery-addresses-unusual-problem-of-too-many-eggs/

Thursday, 13 January 2022

U.S. man recovering after ‘breakthrough’ pig-heart transplant

 

Chigago: successful Pig-to-Human heart transplant 

CHICAGO, Jan 10 (Reuters) - A U.S. man with terminal heart disease was implanted with a genetically modified pig heart in a first-of-its-kind surgery, and three days later the patient is doing well, his doctors reported on Monday.eyondWords

By Julie Steenhuysen

The surgery, performed by a team at the University of Maryland Medicine, is among the first to demonstrate the feasibility of a pig-to-human heart transplant, a field made possible by new gene editing tools.

If proven successful, scientists hope pig organs could help alleviate shortages of donor organs.

“This was a breakthrough surgery and brings us one step closer to solving the organ shortage crisis. There are simply not enough donor human hearts available to meet the long list of potential recipients,” Dr. Bartley Griffith, who surgically transplanted the pig heart into the patient, said in a statement.

“We are proceeding cautiously, but we are also optimistic that this first-in-the-world surgery will provide an important new option for patients in the future,” Griffith added.

For 57-year-old David Bennett of Maryland, the heart transplant was his last option.

“It was either die or do this transplant. I want to live. I know it’s a shot in the dark, but it’s my last choice,” Bennett said a day before his surgery, according to a statement released by the university.

To move ahead with the experimental surgery, the university obtained an emergency authorization from the U.S. Food and Drug Administration on New Year’s Eve through its compassionate use program.

“The FDA used our data and data on the experimental pig to authorize the transplant in an end-stage heart disease patient who had no other treatment options,” said Dr. Muhammad Mohiuddin, who heads the University’s program on xenotransplantation – transplanting animal organs into humans.

About 110,000 Americans are currently waiting for an organ transplant, and more than 6,000 patients die each year before getting one, according to organdonor.gov.

Bennett’s genetically modified pig heart was provided by Revivicor, a regenerative medicine company based in Blacksburg, Virginia. On the morning of the surgery, the transplant team removed the pig’s heart and placed it into a special device to preserve its function until the surgery.

Pigs have long been a tantalizing source of potential transplants because their organs are so similar to humans. A hog heart at the time of slaughter, for example, is about the size of an adult human heart.

Other organs from pigs being researched for transplantation into humans include kidneys, liver and lungs.

Prior efforts at pig-to-human transplants have failed because of genetic differences that caused organ rejection or viruses that posed an infection risk.

Scientists have tackled that problem by editing away potentially harmful genes.

In the heart implanted in Bennett, three genes previously linked with organ rejection were “knocked out” of the donor pig, and six human genes linked with immune acceptance were inserted into the pig genome.

Researchers also deleted a pig gene to prevent excessive growth of the pig heart tissue.

The work was funded in part with a $15.7 million research grant to evaluate Revivicor’s genetically-modified pig hearts in baboon studies.

In addition to the genetic changes to the pig heart, Bennett received an experimental anti-rejection drug made by Kiniksa Pharmaceuticals based in Lexington, Mass. 

https://www.dailymaverick.co.za/article/2022-01-11-u-s-man-recovering-after-breakthrough-pig-heart-transplant/

Wednesday, 12 January 2022

China builds artificial moon

 

China builds artificial moon

The national research facility simulates the low-gravity environment on the Moon
China builds artificial moon

China has built an artificial moon on Earth that simulates low-gravity conditions – the first of its kind. The facility is expected to play a key role in China’s future lunar missions.

Speaking on Tuesday, scientist Li Ruilin, from the China University of Mining and Technology, said that the artificial moon project in eastern city of Xuzhou is expected to be officially launched in the coming months. 

Li described the program as “first of its kind in the world” and said it takes lunar simulation to a completely new level, as it can make gravity “disappear” and can “last as long as you want.”

The facility is made up of a vacuum chamber which houses a mini “moon” measuring 60cm (about two feet) in diameter. The moon-like landscape is made up of rocks and dust that are as light as those found on our Moon.

The landscape is supported by a magnetic field, like the Moon – where gravity is approximately one-sixth as strong as the gravity on Earth. Where the field is strong enough, certain light objects, such as a frog or chestnut, can levitate.

Li said the project is likely to play an important role in preparing for Chinese lunar operations, allowing scientists to test equipment and even prevent miscalculations that could prove costly on the Moon itself. 

“Some experiments such as an impact test need just a few seconds [in the simulator],” said Li, adding that “others such as creep testing can take several days.”

The scientist noted that it could also be used to test whether 3D printing works on the Moon or whether lunar settlements would be able to survive.

“Some experiments conducted in the simulated environment can also give us some important clues, such as where to look for water trapped under the surface,” he said.

Li said that a number of technical innovations were needed to make the facility, noting that the magnetic forces needed to create the atmosphere are so strong that they can tear apart components like superconducting wires and render many metallic components useless.

He added that the facility, which was inspired by Andre Geim’s experiments to levitate a frog with a magnet, would be open to researchers from around the world.

https://www.rt.com/news/545796-china-builds-artificial-moon/

Monday, 23 August 2021

Northeast residents told to destroy invasive insect

 

Northeast residents told to destroy invasive insect

Officials warn the spotted lanternfly could do some serious economic damage

There's a new bug invading the eastern U.S. 

The spotted lanternfly has been seen in New Jersey, New York, Pennsylvania and Indiana. 

Rhode Island discovered the state's first specimen at the beginning of the month, state environmental officials said.

The winged pest, also known as Lycorma delicatula, is native to China. 

It was first detected in Pennsylvania in 2014 but appeared to have already been present for two to three years prior, according to the USDA National Invasive Species Information Center.

It has also been found in Delaware, Maryland, Connecticut and Virginia, according to the New York State Department of Environmental Conservation (DEC). 

Close-up of spotted lanternfly (Lycorma delicatula) on peach tree, Berks County Pa.

Close-up of spotted lanternfly (Lycorma delicatula) on peach tree, Berks County Pa. (iStock)

The spotted lanternfly appears as big as a butterfly but with a moth-like appearance. 

The Pennsylvania Department of Agriculture states that an adult is approximately 1 inch long and half an inch wide at rest, with tan, semi-transparent forewings, black spots, patches of red and black and a white band and yellow and black abdomen.

The spotted lanternfly's immature stages are black with white spots, and they develop the red patches as they mature.

Adults appear starting in July and in the fall adults lay 30 to 50 1-inch-long egg masses on tree trunks, firewood, rocks and vehicles. 

The periodical cicadas in the eastern U.S. also laid their eggs in trees, so why is the spotted lanternfly "Public Enemy Number One?"

The USDA National Invasive Species Information Center says it poses a "serious economic threat to multiple U.S. industries."

The insect feeds on agricultural crops like grapes, apples and hops as well as maple, walnut and willow trees.

Spotted Lanternfly (lycorma delicatula) infestations have caused Pennsylvania's Department of Agriculture to issue a quarantine invasive insect

Spotted Lanternfly (lycorma delicatula) infestations have caused Pennsylvania's Department of Agriculture to issue a quarantine invasive insect (iStock)

The Empire State says its presence could impact forests – making plants vulnerable to disease –  and the agricultural and tourism industries.

New York's annual yield of apples and grapes – a combined value of $358.4 million – could be "greatly impacted" by infestations, the DEC said.

Signs of infestation include sap oozing from tree trunks; 1-inch-long, brownish-gray or brown and scaly egg masses; and honeydew build-up under plants. The lanternflies excrete honeydew, which encourages the growth of black sooty mold.

Multiple counties in Pennsylvania are now quarantined, the Pennsylvania Department of Agriculture said. 

Reports show New Jersey's Somerset and Hunterdon counties are also under quarantine.

The message to people who believe they've seen these insects is clear: If you see something, say something…after you kill it. 

"Kill it! Squash it, smash it...just get rid of it," the Pennsylvania Department of Agriculture instructed.

"If you see a Spotted Lanternfly, help us Stomp it Out," New Jersey's Department of Agriculture pleaded. 

Officials also encourage all "SLF" spotters and killers to submit public reports using state websites to be able to better understand the spread of this species.

https://www.foxnews.com/science/northeast-residents-destroy-invasive-insect


Thursday, 12 August 2021

This Spanish company can extract water from thin air

 

This Spanish company can extract water from thin air

A team of Spanish engineers developed machinery that can extract water from thin air in hot and dry areas, AccuWeather Senior On-Air Meteorologist Adam Del Rosso reported on AccuWeather Prime. 

Juan Veiga, an engineer at the Seville-based company Aquaer, explained to AccuWeather that its machines cool the air down until it condenses into water -- the same effect that causes condensation in air-conditioning units, Reuters reported.

“It’s the same, but we force it 24 hours per day and in very hot weather,” Veiga told Del Rosso, adding that the units can operate in heat and low humidity. The largest units can produce 20,000 liters of water per day, Veiga said. 

Aquaer machines can pull water from thin air. (Credit: Aquaer)

Veiga said that his father started the project 25 years ago. Back in the 1990s, Spain was experiencing a severe drought. The company has been up and running since 2004. But now, the demand is increasing. Veiga said he receives about 15 emails a day requesting further information on the technology. 

He speaks with folks about the machines from all over the world, including the Philippines and Mexico, Veiga told AccuWeather. The devices are already delivering clean water to some communities in Namibia and in a Lebanese refugee camp, Reuters reported.

"The goal is to help people," engineer Enrique Veiga, 82, told Reuters. "The goal is to get to places like refugee camps that don't have drinking water."

https://www.accuweather.com/en/weather-news/this-spanish-company-can-extract-water-from-thin-air/997349

Sunday, 18 July 2021

Mystery at 'Skeleton Lake' continues to puzzle and enthrall

 

Mystery at 'Skeleton Lake' continues to puzzle and enthrall

Decades ago the skeletal remains of hundreds of people were found at a glacial lake in the Indian Himalayas. But advancements in science have brought more questions than answers.

Tucked far up in the freezing, snow-covered mountain ranges of the Himalayas at the dizzying height of more than 15,700 feet above sea level is Roopkund Lake, a small body of water.

At roughly 130 feet (40 meters) in diameter, the lake is less than the width of a football field. But the little lake has a big reputation. It's where the mystery of the dead is still very much alive.

The body of water, commonly known as "Skeleton Lake," is the final resting place for what scientists estimate to be 500 to 800 sets of human remains. It's a mysterious lake where hundreds of people met death and the icy Himalayas continued to preserve their remains.

“If you read about it or try to imagine it, I think that’s when it feels very spooky," journalist Neelima Vallangi told AccuWeather from her home in Kathmandu, Nepal. "That 500 to 800 skeletons are lying abandoned in the mountains deep in the Himalayas. It feeds your imagination."

In 1942, an Indian forest official discovered the skeletal remains scattered in and around the lake. He reported the strange discovery, but it wasn't made public until the late 1950s. As National Geographic reported, "In the 1950s, one explorer described the site to an Indian radio station as a 'ghastly scene that made us catch our breath.'"

A map showing the ocation of Roopkund Lake

It was initially believed that the skeletons were Japanese soldiers or Tibetan traders who died due to an epidemic or from exposure to the unforgiving elements.

However, forensic analysis in 2004 revealed unhealed injuries on several skulls that led scientists to conclude that a group of Indian pilgrims, both men and women, assisted by local porters from the region, were struck by giant hail at Roopkund in a single event in the 9th century.

As Neelima Vallangi wrote for the BBC, "They were believed to have been on a revered, once-in-a-12-year Hindu pilgrimage called Nanda Devi Raj Jat Yatra, an ancient tradition that continues to this day. Roopkund is on the way to Homkund, the final destination of this arduous foot journey."

The theory was plausible at the time. The group comprised both men and women of various ages, which ruled out the possibility that the remains belonged to soldiers.

But from a meteorological perspective, "killer hail" is an unlikely culprit due to the high altitude of Roopkund Lake, AccuWeather Senior International Meteorologist Jim Andrews said.

"At such a high elevation, there seems not to be enough heat or moisture -- both are related through thermodynamics -- to breed "killer" hail," Andrews, who closely observes meteorological conditions in this part of the world, explained.

Andrews didn't completely rule out the possibility given that this is an event that took place more than 1,000 years ago, but generally, the conditions at a location as far above sea level as Roopkund Lake would "limit repeated freeze-thaw, wet-freeze cycles" necessary to produce large hail. He said the conditions there would favor "small and/or soft hail over seriously large, icy hail."

Veena Mushrif-Tripathy, professor of archaeology at Deccan College in Pune, was part of the 2004 investigation. She said no weapons or signs of combat were found at the site, but they did find musical instruments, which is consistent with old folk stories of pilgrims traveling on the Nanda Devi Raj Jat Yatra. The victims were also healthy when they died, which rules out a mass epidemic.

Vallangi completed the trek that leads past Roopkund Lake in September 2009. She told AccuWeather that, at the time, she was excited about hiking so high in the Himalayas.

“You have to be reasonably fit to be able to walk for five to 10 days and the temperature obviously changes, fluctuates from 20 degrees (C) in the plains or lower hills to zero or sub-zero once you reach 4,000, 5,000 meters," she said, referring to a temperature range from about 68 degrees to below freezing. "This lake is at 4,800 meters.”

Vallangi was with a large group when she first set eyes on Skeleton Lake. She said that, before the group arrived, her guide had told them the most popular story behind the human remains: Pilgrims were caught in a huge hailstorm and perished.

This was what those in Neelima Vallangi's group believed they were seeing when they stopped at Skeleton Lake one frigid morning in 2010.

“It was very freezing and it was very cold but once the sun is up it’s like a nice ski day," she said. "It's just that early in the morning when you're walking in the dark that's when it's really cold and miserable."

Neelima Vallangi is a journalist and photographer who went on a trek in the Himalayas that included a stop at Roopkund Lake. (AccuWeather)

The group was on the way to Junargali, a jagged ridge with a panoramic view of the high Himalayas that sits far above the lake.

“We saw some skulls and the leg bones and big arm bones and all these things just piled up,” she told AccuWeather.

“It’s not like you just walk in and there are just skeletons all over. Some of them are in the lake, apparently, and some of them are probably buried in the slopes in the snow, so sometimes when the snow is completely melted you could see them," Vallangi continued. "But when we went, the whole region was completely covered in snow so we couldn’t see any other skeletons scattered around apart from the pile."

A year after Vallangi's trek, the first ancient human genome was sequenced, revolutionizing research into the past. The cold case of Roopkund Lake was heating up. Bone samples from 38 skeletal remains were sent to labs around the world for full genomic analysis. The results of the five-year-long study, published in 2019, were stunning.

The new study revealed that the 38 skeletons belonged to three genetically distinct groups and were deposited at the lake during multiple events over a 1,000-year period.

The new results show that there were 23 people with South Asian ancestry at Roopkund, but they died during one or several events between the 7th and 10th centuries A.D.

Incredibly, the study revealed, another group of 14 victims died there a thousand years later—most likely during a single event in the 19th century. Furthermore, this group had a genetic ancestry tied to the Mediterranean, specifically Greece and Crete. (There was one sample that had South-East Asian origin, also from the 19th century.) 

“Now we see people died in multiple events between the seventh and tenth century and someone else died in the 18th or 19th century so now we don’t know exactly what happened at all,” Vallangi told AccuWeather.

The discovery of Mediterranean migrants in India is particularly surprising. There is no historical evidence or explanation for who these people were and what they were doing deep in the Himalayas.

The year “1800 is not that long ago. People would remember if something unusual happened." Vallangi said. "I think it would have been passed down in oral history or it must be there in the collective memory of locals because it’s a pretty remote place. So if a foreign-looking group came there and they all perished in the mountains, it seems highly unlikely that nobody would know or remember such a bizarre incident.”

Interestingly, advancements in science have raised more questions than answers. The mystery of what happened at Skeleton Lake doesn't appear any closer to being solved.

“Now that I’ve read all the studies it’s like I’ve put together all of it in my mind and I feel like, 'Wow, this is a crazy mystery!” Vallangi said.

It's a difficult archaeological site due to its remoteness, the extreme weather, and the fact that, over the years, the skeletons have been moved around by trekkers and even taken home as souvenirs. In fact, the trek became so popular the environment began to degrade and the trek past Roopkund Lake is now banned.

More than a decade after that frigid morning when she first stood at the edge of Skeleton Lake, the story continues to grip Vallangi's imagination. But with such little evidence, she wonders whether the world will ever know the truth about what happened there.

“Who are these people? What happened there? Why are they all going there to die in that one lake?" she still wonders. "Yeah, I think it’s a very interesting story ... I don’t know how this will ever be solved.”

https://www.accuweather.com/en/travel/mystery-at-skeleton-lake-continues-to-puzzle-and-enthrall/978260