Tech News
NASA’s Curiosity rover has found the longest chain carbon molecules yet on Mars
Science - Posted On:2025-03-30 07:45:00 Source: arstechnica
NASA’s Curiosity Mars rover has detected the largest organic (carbon-containing) molecules ever found on the red planet. The discovery is one of the most significant findings in the search for evidence of past life on Mars. This is because, on Earth at least, relatively complex, long-chain carbon molecules are involved in biology. These molecules could actually be fragments of fatty acids, which are found in, for example, the membranes surrounding biological cells.
Scientists think that, if life ever emerged on Mars, it was probably microbial in nature. Because microbes are so small, it’s difficult to be definitive about any potential evidence for life found on Mars. Such evidence needs more powerful scientific instruments that are too large to be put on a rover.
The organic molecules found by Curiosity consist of carbon atoms linked in long chains, with other elements bonded to them, like hydrogen and oxygen. They come from a 3.7-billion-year-old rock dubbed Cumberland, encountered by the rover at a presumed dried-up lakebed in Mars’s Gale Crater. Scientists used the Sample Analysis at Mars (SAM) instrument on the NASA rover to make their discovery.
Did Life on Earth Come from 'Microlightning' Between Charged Water Droplets?
science - Posted On:2025-03-29 21:45:00 Source: slashdot
Some scientists believe life on earth originated in organic matter in earth's bodies of water more than 3.5 billion years ago," reports CNN. "But where did that organic material come from...?" Maybe electrical energy sparked the beginnings of life on earth — just like in Frankenstein: Researchers decades ago proposed that lightning caused chemical reactions in ancient Earth's oceans and spontaneously produced the organic molecules. Now, new research published March 14 in the journal Science Advances suggests that fizzes of barely visible "microlightning," generated between charged droplets of water mist, could have been potent enough to cook up amino acids from inorganic material. Amino acids — organic molecules that combine to form proteins — are life's most basic building blocks and would have been the first step toward the evolution of life... For animo acids to form, they need nitrogen atoms that can bond with carbon. Freeing up atoms from nitrogen gas requires severing powerful molecular bonds and takes an enormous amount of energy, according to astrobiologist and geobiologist Dr. Amy J. Williams [an associate professor in the department of geosciences at the University of Florida who was not involved in the research]. "Lightning, or in this case, microlightning, has the energy to break molecular bonds and therefore facilitate the generation of new molecules that are critical to the origin of life on Earth," Williams told CNN in an email... For the new study, scientists revisited the 1953 experiments but directed their attention toward electrical activity on a smaller scale, said senior study author Dr. Richard Zare, the Marguerite Blake Wilbur Professor of Natural Science and professor of chemistry at Stanford University in California. Zare and his colleagues looked at electricity exchange between charged water droplets measuring between 1 micron and 20 microns in diameter. (The width of a human hair is 100 microns....) The researchers mixed ammonia, carbon dioxide, methane and nitrogen in a glass bulb, then sprayed the gases with water mist, using a high-speed camera to capture faint flashes of microlightning in the vapor. When they examined the bulb's contents, they found organic molecules with carbon-nitrogen bonds. These included the amino acid glycine and uracil, a nucleotide base in RNA... "What we have done, for the first time, is we have seen that little droplets, when they're formed from water, actually emit light and get this spark," Zare said. "That's new. And that spark causes all types of chemical transformations...." Even on a volatile Earth billions of years ago, lightning may have been too infrequent to produce amino acids in quantities sufficient for life — a fact that has cast doubt on such theories in the past, Zare said. Water spray, however, would have been more common than lightning. A more likely scenario is that mist-generated microlightning constantly zapped amino acids into existence from pools and puddles, where the molecules could accumulate and form more complex molecules, eventually leading to the evolution of life. "We propose," Zare told CNN, "that this is a new mechanism for the prebiotic synthesis of molecules that constitute the building blocks of life." Read more of this story at Slashdot.
Scientists Create New Heavy-Metal Molecule: 'Berkelocene'
science - Posted On:2025-03-29 12:45:00 Source: slashdot
An anonymous reader shared this report from the Mercury News: After a year of fastidious planning, a microscopic sample of the ultra-rare radioactive element berkelium arrived at a Berkeley Lab. With just 48 hours to experiment before it would become unusable, a group of nearly 20 researchers focused intently on creating a brand-new molecule. Using a chemical glove box, a polycarbonate glass box with protruding gloves that shields substances from oxygen and moisture, scientists combined the berkelium metal with an organic molecule containing only carbon and hydrogen to create a chemical reaction... [Post-doc researcher Dominic] Russo, researcher Stefan Minasian, and 17 other scientists at Lawrence Berkeley National Laboratory had created berkelocene, a new molecule that usurps theorists' expectations about how carbon bonds with heavy-metal elements. In the future, berkelocene may help humanity safely dispose of nuclear waste, according to a study published in the academic journal Science... The new molecular structure is, in the nomenclature of researchers, a "sandwich." In this formation, a berkelium atom, serving as the filling, lays in between two 8-membered carbon rings — the "bread" — and resembles an atomic foot-long sub. "It has this very symmetric geometry, and it's the first time that that's been observed," Minasian said. The researchers believe more accurate models for how actinide elements like uranium behave will help solve problems related to long-term nuclear waste storage. Read more of this story at Slashdot.
NASA Adds SpaceX's Starship To Launch Services Program Fleet
science - Posted On:2025-03-29 06:15:00 Source: slashdot
Despite recent test failures, NASA has added SpaceX's Starship to its Launch Services Program contract, allowing it to compete for future science missions once it achieves a successful orbital flight. Florida Today reports: NASA announced the addition Friday to its current launch provider contract with SpaceX, which covers the Falcon 9 and Falcon Heavy. This opens the possibility of Starship flying future NASA science missions -- that is once Starship reaches a successful orbital flight. "NASA has awarded SpaceX of Starbase, Texas, a modification under the NASA Launch Services (NLS) II contract to add Starship to their existing Falcon 9 and Falcon Heavy launch service offerings," NASA's statement reads. Th announcement is simply an onboarding of Starship as an option, as the contract runs through 2032. However, SpaceX is under pressure to get Starship operational by next year as the company plans not only to send an uncrewed Starship to Mars by late 2026, but the NASA Artemis III moon landing is fast approaching. Should it remain the plan with the current administration, Starship will act as a human lander for NASA's Artemis III crew. "The NLS II contracts are multiple award, indefinite-delivery/indefinite-quantity, with an ordering period through June 2030 and an overall period of performance through December 2032. The contracts include an on-ramp provision that provides an opportunity annually for new launch service providers to add their launch service on an NLS II contract and compete for future missions and allows existing contractors to introduce launch services not currently on their NLS II contracts," NASA's statement reads. Read more of this story at Slashdot.
Martian Dust May Pose Health Risk To Humans Exploring Red Planet, Study Finds
science - Posted On:2025-03-29 03:15:00 Source: slashdot
A new study warns that toxic Martian dust contains fine particles and harmful substances like silica and metals that pose serious health risks to astronauts, making missions to Mars more dangerous than previously thought. The Guardian reports: During Apollo missions to the moon, astronauts suffered from exposure to lunar dust. It clung to spacesuits and seeped into the lunar landers, causing coughing, runny eyes and irritated throats. Studies showed that chronic health effects would result from prolonged exposure. Martian dust isn't as sharp and abrasive as lunar dust, but it does have the same tendency to stick to everything, and the fine particles (about 4% the width of a human hair) can penetrate deep into lungs and enter the bloodstream. Toxic substances in the dust include silica, gypsum and various metals. "A mission to Mars does not have the luxury of rapid return to Earth for treatment," the researchers write in the journal GeoHealth. And the 40-minute communication delay will limit the usefulness of remote medical support from Earth. Instead, the researchers stress that limiting exposure to dust is essential, requiring air filters, self-cleaning space suits and electrostatic repulsion devices, for example. Read more of this story at Slashdot.
Giant, Fungus-Like Organism May Be Completely Unknown Branch of Life
science - Posted On:2025-03-28 21:15:01 Source: slashdot
New research suggests that Prototaxites, once believed to be a giant fungus, may actually represent an entirely extinct and previously unknown branch of complex life, distinct from fungi, plants, animals, and protists. Live Science reports: The researchers studied the fossilized remains of one Prototaxites species named Prototaxites taiti, found preserved in the Rhynie chert, a sedimentary deposit of exceptionally well-preserved fossils of early land plants and animals in Scotland. This species was much smaller than many other species of Prototaxites, only growing up to a few inches tall, but it is still the largest Prototaxites specimen found in this region. Upon examining the internal structure of the fossilized Prototaxites, the researchers found that its interior was made up of a series of tubes, similar to those within a fungus. But these tubes branched off and reconnected in ways very unlike those seen in modern fungi. "We report that Prototaxites taiti was the largest organism in the Rhynie ecosystem and its anatomy was fundamentally distinct from all known extant or extinct fungi," the researchers wrote in the paper. "We therefore conclude that Prototaxites was not a fungus, and instead propose it is best assigned to a now entirely extinct terrestrial lineage." True fungi from the same period have also been preserved in the Rhynie chert, enabling the researchers to chemically compare them to Prototaxites. In addition to their unique structural characteristics, the team found that the Prototaxites fossils left completely different chemical signatures to the fungi fossils, indicating that the Prototaxites did not contain chitin, a major building block of fungal cell walls and a hallmark of the fungal kingdom. The Prototaxites fossils instead appeared to contain chemicals similar to lignin, which is found in the wood and bark of plants. "We conclude that the morphology and molecular fingerprint of P. taiti is clearly distinct from that of the fungi and other organism preserved alongside it in the Rhynie chert, and we suggest that it is best considered a member of a previously undescribed, entirely extinct group of eukaryotes," the researchers wrote. The research has been published on the preprint server bioRxiv. Read more of this story at Slashdot.
A New Image File Format Efficiently Stores Invisible Light Data
science - Posted On:2025-03-28 20:00:00 Source: slashdot
An anonymous reader quotes a report from Ars Technica: Imagine working with special cameras that capture light your eyes can't even see -- ultraviolet rays that cause sunburn, infrared heat signatures that reveal hidden writing, or specific wavelengths that plants use for photosynthesis. Or perhaps using a special camera designed to distinguish the subtle visible differences that make paint colors appear just right under specific lighting. Scientists and engineers do this every day, and they're drowning in the resulting data. A new compression format called Spectral JPEG XL might finally solve this growing problem in scientific visualization and computer graphics. Researchers Alban Fichet and Christoph Peters of Intel Corporation detailed the format in a recent paper published in the Journal of Computer Graphics Techniques (JCGT). It tackles a serious bottleneck for industries working with these specialized images. These spectral files can contain 30, 100, or more data points per pixel, causing file sizes to balloon into multi-gigabyte territory -- making them unwieldy to store and analyze. [...] The current standard format for storing this kind of data, OpenEXR, wasn't designed with these massive spectral requirements in mind. Even with built-in lossless compression methods like ZIP, the files remain unwieldy for practical work as these methods struggle with the large number of spectral channels. Spectral JPEG XL utilizes a technique used with human-visible images, a math trick called a discrete cosine transform (DCT), to make these massive files smaller. Instead of storing the exact light intensity at every single wavelength (which creates huge files), it transforms this information into a different form. [...] According to the researchers, the massive file sizes of spectral images have reportedly been a real barrier to adoption in industries that would benefit from their accuracy. Smaller files mean faster transfer times, reduced storage costs, and the ability to work with these images more interactively without specialized hardware. The results reported by the researchers seem impressive -- with their technique, spectral image files shrink by 10 to 60 times compared to standard OpenEXR lossless compression, bringing them down to sizes comparable to regular high-quality photos. They also preserve key OpenEXR features like metadata and high dynamic range support. The report notes that broader adoption "hinges on the continued development and refinement of the software tools that handle JPEG XL encoding and decoding." Some scientific applications may also see JPEG XL's lossy approach as a drawback. "Some researchers working with spectral data might readily accept the trade-off for the practical benefits of smaller files and faster processing," reports Ars. "Others handling particularly sensitive measurements might need to seek alternative methods of storage." Read more of this story at Slashdot.
Nearly Half of People in the US Have Toxic PFAS in Their Drinking Water
science - Posted On:2025-03-28 17:15:00 Source: slashdot
An anonymous reader shares a report: New data recently released by the Environmental Protection Agency indicate that more than 158 million people across the U.S. have drinking water contaminated by toxic "forever chemicals," scientifically known as perfluoroalkyl and polyfluoroalkyl substances (PFAS). "Drinking water is a major source of PFAS exposure. The sheer number of contaminated sites shows that these chemicals are likely present in most of the U.S. water supply," said David Andrews, deputy director of investigations and a senior scientist at the Environmental Working Group (EWG), a nonprofit advocacy organization, in a recent press release. Read more of this story at Slashdot.
Scientists Propose 'Bodyoids' To Address Medical Research and Organ Shortage Challenges
science - Posted On:2025-03-28 16:00:00 Source: slashdot
Stanford University researchers have proposed creating "bodyoids" -- ethically sourced human bodies grown from stem cells without neural components for consciousness or pain sensation -- to revolutionize medical research and address organ shortages. In a new opinion piece published in MIT Technology Review, scientists Carsten T. Charlesworth, Henry T. Greely, and Hiromitsu Nakauchi argue that recent advances in biotechnology make this concept increasingly plausible. The approach would combine pluripotent stem cells, artificial uterus technology, and genetic techniques to inhibit brain development. The researchers point to persistent shortages of human biological materials as a major bottleneck in medical progress. More than 100,000 patients currently await solid organ transplants in the US alone, while less than 15% of drugs entering clinical trials receive regulatory approval. These lab-grown bodies could potentially generate patient-specific organs that are perfect immunological matches, eliminate the need for lifelong immunosuppression, and provide personalized drug screening models. Read more of this story at Slashdot.
Trump annoyed the Smithsonian isn’t promoting discredited racial ideas
Science - Posted On:2025-03-28 12:30:01 Source: arstechnica
On Thursday, the Trump administration issued an executive order that took aim at one of the US's foremost cultural and scientific institutions: the Smithsonian. Upset by exhibits that reference the role of racism, sexism, and more in the nation's complicated past, the order tasks the vice president and a former insurance lawyer (?) with ensuring that the Smithsonian Institution is a "symbol of inspiration and American greatness"—a command that specifically includes the National Zoo.
But in the process of airing the administration's grievances, the document specifically calls out a Smithsonian display for accurately describing our current scientific understanding of race. That raises the prospect that the vice president will ultimately demand that the Smithsonian display scientifically inaccurate information.
The executive order, entitled "Restoring Truth And Sanity To American History," is filled with what has become a standard grievance: the accusation that, by recognizing the many cases where the US has not lived up to its founding ideals, institutions are attempting to "rewrite our nation's history." It specifically calls out discussions of historic racism, sexism, and oppression as undercutting the US's "unparalleled legacy of advancing liberty, individual rights, and human happiness."
75% of Scientists in Nature Poll Weigh Leaving US
science - Posted On:2025-03-28 11:45:00 Source: slashdot
A Nature survey has found that three-quarters of responding U.S. scientists are considering leaving the nation following disruptions to science under the Trump administration. Out of 1,608 respondents, 75.3% said they were contemplating leaving the country. Scientists cited concerns over research funding and the general treatment of science as contributing factors for their reasoning. Europe and Canada were mentioned as potential destinations for those looking for opportunities abroad. Read more of this story at Slashdot.
Rocket Report: Stoke is stoked; sovereignty is the buzzword in Europe
Science - Posted On:2025-03-28 08:15:01 Source: arstechnica
Welcome to Edition 7.37 of the Rocket Report! It's been interesting to watch how quickly European officials have embraced ensuring they have a space launch capability independent of other countries. A few years ago, European government satellites regularly launched on Russian Soyuz rockets, and more recently on SpaceX Falcon 9 rockets from the United States. Russia is now non grata in European government circles, and the Trump administration is widening the trans-Atlantic rift. European leaders have cited the Trump administration and its close association with Elon Musk, CEO of SpaceX, as prime reasons to support sovereign access to space, a capability currently offered only by Arianespace. If European nations can reform how they treat their commercial space companies, there's enough ambition, know-how, and money in Europe to foster a competitive launch industry.
As always, we welcome reader submissions. If you don't want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets as well as a quick look ahead at the next three launches on the calendar.
Isar Aerospace aims for weekend launch. A German startup named Isar Aerospace is will try to launch its first rocket Saturday, aiming to become the first in a wave of new European launch companies to reach orbit, Ars reports. The Spectrum rocket consists of two stages, stands about 92 feet (28 meters) tall, and can haul payloads up to 1 metric ton (2,200 pounds) into low-Earth orbit. Based in Munich, Isar was founded by three university graduate students in 2018. Isar scrubbed a launch attempt Monday due to unfavorable winds at the launch site in Norway.
As NASA Faces Cuts, China Reveals Ambitious Plans For Planetary Exploration
science - Posted On:2025-03-28 04:15:00 Source: slashdot
As NASA faces potential budget cuts, China is unveiling an ambitious series of deep space missions -- including Mars sample returns, outer planet exploration, and a future Mars base. While some of China's plans are aspirational, their track record of successful missions lends credibility to their expanding role in space. Ars Technica reports: China created a new entity called the "Deep Space Exploration Laboratory" three years ago to strengthen the country's approach to exploring the Solar System. Located in eastern China, not far from Shanghai, the new laboratory represented a partnership between China's national space agency and a local public college, the University of Science and Technology of China. Not much is known outside of China about the laboratory, but it has recently revealed some very ambitious plans to explore the Solar System, including the outer planets. This week, as part of a presentation, Chinese officials shared some public dates about future missions. Space journalist Andrew Jones, who tracks China's space program, shared some images with a few details. Among the planned missions are: - 2028: Tianwen-3 mission to collect samples of Martian soil and rocks and return them to Earth - 2029: Tianwen-4 mission to explore Jupiter and its moon Callisto - 2030: Development of a large, ground-based habitat to simulate long-duration human spaceflight - 2033: Mission to Venus that will return samples of its atmosphere to Earth - 2038: Establishment of an autonomous Mars research station to study in-situ resource utilization - 2039: Mission to Triton, Neptune's largest moon, with a subsurface explorer for its ocean Read more of this story at Slashdot.
Study of Lyft rideshare data confirms minorities get more tickets
Science - Posted On:2025-03-27 17:45:01 Source: arstechnica
It's no secret that "driving while black" is a real phenomenon. Study after study has shown that minority drivers are ticketed at a higher rate, and data from speed cameras suggests that it's not because they commit traffic violations more frequently. But this leaves open the question of why. Bias is an obvious answer, but it's hard to eliminate an alternative explanation: Minority groups may engage in more unsafe driving, and the police are trying to deter that.
But now, Lyft has given a group of researchers access to detailed data from their drivers. The results confirm that minority drivers get more tickets, and they pay higher fines when they do. And the results also show that minorities aren't in any way more likely to speed or engage in unsafe driving. Which suggests, in their words, that the problem is "animus" against minority drivers.
The work was done thanks to cooperation from the ridesharing company Lyft, which provided data on its drivers in Florida, all 222,838 of them, along with a record of all the GPS pings their tracking systems sent into the company's servers. Combined with a detailed map of Florida's roads, along with their speed limits, they could determine when a given driver was speeding. They also obtained Florida police records of any accidents and cross-referenced their locations to any vehicle that experienced a sudden stop in that spot at the same time.
Maybe Trump should go back to calling his missile shield the Iron Dome
Science - Posted On:2025-03-27 12:45:00 Source: arstechnica
The US Space Force celebrated its fifth birthday last year, when it boasted an annual budget of $29 billion, about 3.5 percent of the Pentagon's overall funding level.
On March 15, President Donald Trump signed a stopgap spending bill that set the Space Force's budget for fiscal year 2025 at $28.7 billion. This was the first cut to the Space Force's budget since Trump created the military's newest service branch in 2019.
Gen. Chance Saltzman, the top general in the Space Force, worries that the budget crunch will hamstring the military's ability to match China's fast-growing space architecture. The Space Force is charged with developing and operating satellites, ground systems, and weapons that the Pentagon could use to track and target enemy forces on the ground and in space.
Researchers get spiking neural behavior out of a pair of transistors
Science - Posted On:2025-03-27 12:45:00 Source: arstechnica
The growing energy use of AI has gotten a lot of people working on ways to make it less power hungry. One option is to develop processors that are a better match to the sort of computational needs of neural networks, which require many trips to memory and a lot of communication between artificial neurons that might not necessarily reside on the same processor. Termed "neuromorphic" processors, this alternative approach to hardware tends to have lots of small, dedicated processing units with their own memory and an extensive internal network connecting them.
Examples like Intel's Loihi chips tend to get competitive performance out of far lower clock speeds and energy use, but they require a lot of silicon to do so. Other options give up on silicon entirely and perform the relevant computation in a form of phase change memory.
A paper published in Nature on Wednesday describes a way to get plain-old silicon transistors to behave a lot like an actual neuron. And unlike the dedicated processors made so far, it only requires two transistors to do so.
Inside arXiv - the Most Transformative Platform in All of Science
science - Posted On:2025-03-27 11:15:01 Source: slashdot
Paul Ginsparg, a physics professor at Cornell University, created arXiv nearly 35 years ago as a digital repository where researchers could share their findings before peer review. Today, the platform hosts more than 2.6 million papers, receives 20,000 new submissions monthly, and serves 5 million active users, Wired writes in a profile of the platform. "Just when I thought I was out, they pull me back in!" Ginsparg quotes from The Godfather, reflecting his inability to fully hand over the platform despite numerous attempts. If arXiv stopped functioning, scientists worldwide would face immediate disruption. "Everybody in math and physics uses it," says Scott Aaronson, a computer scientist at the University of Texas at Austin. "I scan it every night." ArXiv revolutionized academic publishing, previously dominated by for-profit giants like Elsevier and Springer, by allowing instant and free access to research. Many significant discoveries, including the "transformers" paper that launched the modern AI boom, first appeared on the platform. Initially a collection of shell scripts on Ginsparg's NeXT machine in 1991, arXiv followed him from Los Alamos National Laboratory to Cornell, where it found an institutional home despite administrative challenges. Recent funding from the Simons Foundation has enabled a hiring spree and long-needed technical updates. Read more of this story at Slashdot.
Space Force Certifies Vulcan For National Security Launches
science - Posted On:2025-03-27 06:15:00 Source: slashdot
The U.S. Space Force has certified United Launch Alliance's Vulcan Centaur rocket for national security missions after successful test flights and resolution of a booster nozzle issue. This certification allows ULA to join SpaceX in conducting launches under the National Security Space Launch program, with Vulcan missions expected to begin this summer. SpaceNews reports: "Thank you to all our customer partners who have worked hand-in-hand with us throughout this comprehensive certification process. We are grateful for the collaboration and excited to reach this critical milestone in Vulcan development," said Tory Bruno, president and chief executive of United Launch Alliance in a ULA statement about the vehicle's certification. Bruno said at the roundtable that the next launch by ULA will be of its Atlas 5, carrying a set of Project Kuiper broadband satellites for Amazon. That launch is expected as soon as next month. He said then that would be followed by the first two Vulcan national security launches, missions designated USSF-106 and USSF-87. ULA did not give a schedule for those upcoming Vulcan launches but Space Systems Command, in a summary accompanying its press release, said the first NSSL mission on Vulcan is planned for the summer. Bruno said at the roundtable that the payloads for those missions have "complex processing" requirements beyond a typical mission, and did not state how long it would take them to be ready for a launch. Bruno said ULA is projecting a dozen launches this year, split roughly evenly between Atlas and Vulcan and between national security and commercial missions. ULA has been stockpiling components, such as BE-4 engines and solid rocket boosters, needed for those missions. "We're all staged up and ready, and as spacecraft show up, we'll be able to fly them," he said. He noted the company wants to get to a "baseline tempo" of two launches a month by the end of this year and perform 20 launches next year. Read more of this story at Slashdot.
Surgeons Transplant Genetically Modified Pig Liver Into Chinese Patient
science - Posted On:2025-03-27 03:15:00 Source: slashdot
Scientists in China successfully transplanted a genetically modified pig liver into a brain-dead patient, where it functioned for 10 days. The liver, modified to reduce immune rejection, produced key proteins and bile, showing compatibility and offering hope for future short-term xenotransplants. The Guardian reports: The surgery, at a Chinese hospital last year, is thought to mark the first time a pig liver has been transplanted into a human. It raises the prospect of pig livers serving as a "bridging organ" for patients on the waiting list for a transplant or to support liver function while their own organ regenerates. [...] The latest procedure was carried out in a 50-year-old man diagnosed with brain death after a severe head injury. The patient's own liver was intact and, in a surgery that took more than 10 hours, the organ taken from a genetically modified Bama miniature pig was plumbed into his blood supply as an additional liver. The pig had six genetic modifications aimed at preventing immune rejection. These included deactivating genes that contribute to the production of sugars on the surface of pig cells, which the human immune system attacks, and introducing genes that express human proteins to "humanize" the liver. After the transplant, the pig liver showed signs of functioning, including producing bile, which helps break down fats in the digestive system, and porcine albumin, a blood protein. The team behind the advance, described in the journal Nature, said it was not clear whether the liver would have been able to fully support the patient, given that he had an existing liver and because the liver was removed after 10 days at the request of his family. Read more of this story at Slashdot.
Scientists Record First Sounds Ever Known To Be Made By Sharks
science - Posted On:2025-03-26 22:30:01 Source: slashdot
sciencehabit quotes a report from Science.org: Whales sing, orcas squeal, and sea turtles croak. But sharks are more the strong, silent type. Now, researchers report the first evidence that sharks make sounds, too, described today in Royal Society Open Science. The animals may be making the sounds -- a series of clicking noises -- by snapping their flat rows of teeth, which are blunt for crushing prey. The sharks can hear mostly low-frequency noise, and the clicks they emit are higher pitched, which suggests they are not for communicating with other rigs. It's possible they are a defensive tactic. Marine mammals that eat rigs, such as leopard seals, can hear in the frequency range of the rig clicks, but the researchers question whether a few clicks would deter an attack. The sounds might be part of their response to being startled, the team says. Read more of this story at Slashdot.