Lead Story
Survey finds roughly 183,000 giant tortoises now roaming Aldabra, once a species pushed to the brink
A five-year survey led by the Seychelles Islands Foundation and the University of Exeter, published this month in the journal Ecology and Evolution, estimates that about 183,000 adult and subadult Aldabra giant tortoises now live on Aldabra Atoll, a figure that exceeds the roughly 123,000 people living in the entire Seychelles. The new estimate accounts for tortoises previously missed by observers because they were hidden by vegetation or shade, correcting earlier counts that put the population closer to 100,000. The species was hunted down to fewer than 1,000 individuals during the 19th century before Aldabra was given strict nature reserve status in 1981 and UNESCO World Heritage listing the following year; researchers also credit a 2012 program that eradicated feral goats from the atoll with helping the population recover. While the findings suggest the population has been relatively stable in recent years rather than suddenly booming, researchers say the milestone underscores how durable protection and habitat restoration can be for a species once reduced to a tiny remnant.
Read more →Lead Story
Survey finds roughly 183,000 giant tortoises now roaming Aldabra, once a species pushed to the brink
A five-year survey led by the Seychelles Islands Foundation and the University of Exeter, published this month in the journal Ecology and Evolution, estimates that about 183,000 adult and subadult Aldabra giant tortoises now live on Aldabra Atoll, a figure that exceeds the roughly 123,000 people living in the entire Seychelles. The new estimate accounts for tortoises previously missed by observers because they were hidden by vegetation or shade, correcting earlier counts that put the population closer to 100,000. The species was hunted down to fewer than 1,000 individuals during the 19th century before Aldabra was given strict nature reserve status in 1981 and UNESCO World Heritage listing the following year; researchers also credit a 2012 program that eradicated feral goats from the atoll with helping the population recover. While the findings suggest the population has been relatively stable in recent years rather than suddenly booming, researchers say the milestone underscores how durable protection and habitat restoration can be for a species once reduced to a tiny remnant.
Natural compound fights dangerous gut infection without wiping out beneficial bacteria
Researchers at Hannover Medical School, Saarland University Hospital and the Helmholtz Institute for Pharmaceutical Research Saarland report that argyrin B, a compound produced by soil-dwelling myxobacteria, is highly effective against Clostridioides difficile in laboratory and mouse tests while largely sparing the rest of the gut microbiome. The findings, published in the journal npj Antimicrobials and Resistance, matter because C. difficile infections are notoriously prone to relapse, and the main rescue option when antibiotics fail and wipe out protective gut bacteria is a stool transplant. By selectively targeting the pathogen rather than bacteria broadly, argyrin B could offer a gentler way to clear the infection and allow the beneficial microbiome to recover on its own. The work is still at the laboratory and animal-model stage, so a clear benefit in human patients has not yet been established, but the research team says the selectivity of the compound makes it a promising candidate for further development.
Read more →Natural compound fights dangerous gut infection without wiping out beneficial bacteria
Researchers at Hannover Medical School, Saarland University Hospital and the Helmholtz Institute for Pharmaceutical Research Saarland report that argyrin B, a compound produced by soil-dwelling myxobacteria, is highly effective against Clostridioides difficile in laboratory and mouse tests while largely sparing the rest of the gut microbiome. The findings, published in the journal npj Antimicrobials and Resistance, matter because C. difficile infections are notoriously prone to relapse, and the main rescue option when antibiotics fail and wipe out protective gut bacteria is a stool transplant. By selectively targeting the pathogen rather than bacteria broadly, argyrin B could offer a gentler way to clear the infection and allow the beneficial microbiome to recover on its own. The work is still at the laboratory and animal-model stage, so a clear benefit in human patients has not yet been established, but the research team says the selectivity of the compound makes it a promising candidate for further development.
American College of Cardiology says exercise should be prescribed like medicine for heart health
The American College of Cardiology published a new scientific statement in its flagship journal, JACC, calling for exercise to be treated as a foundational, prescribed component of cardiovascular prevention and treatment rather than general lifestyle advice. The statement recommends individualized, achievable and sustainable programs that combine resistance training with aerobic exercise for most adults, and says routine exercise stress testing beforehand is unnecessary for most asymptomatic, clinically stable people, reserving it for cases where it would meaningfully change the prescription. It cites modest activity levels, in the range of roughly 4,000 to 8,000 steps a day, as delivering meaningful benefit, and reaffirms cardiac rehabilitation as a first-line treatment that should be made more widely accessible, with wearables and home-based programs highlighted as tools that can help patients stick with it. The guidance even extends qualified support to mild-to-moderate recreational exercise for many patients with hypertrophic cardiomyopathy, a group historically advised toward caution.
Read more →American College of Cardiology says exercise should be prescribed like medicine for heart health
The American College of Cardiology published a new scientific statement in its flagship journal, JACC, calling for exercise to be treated as a foundational, prescribed component of cardiovascular prevention and treatment rather than general lifestyle advice. The statement recommends individualized, achievable and sustainable programs that combine resistance training with aerobic exercise for most adults, and says routine exercise stress testing beforehand is unnecessary for most asymptomatic, clinically stable people, reserving it for cases where it would meaningfully change the prescription. It cites modest activity levels, in the range of roughly 4,000 to 8,000 steps a day, as delivering meaningful benefit, and reaffirms cardiac rehabilitation as a first-line treatment that should be made more widely accessible, with wearables and home-based programs highlighted as tools that can help patients stick with it. The guidance even extends qualified support to mild-to-moderate recreational exercise for many patients with hypertrophic cardiomyopathy, a group historically advised toward caution.
Astronomers pin down the universe's primordial helium content with record-breaking precision
Using 130 hours of observation time on the Large Binocular Telescope, a team including researchers from Ohio State and the University of Minnesota measured the primordial helium abundance, the helium forged in the first few minutes of the universe, to within about 0.5% uncertainty, roughly three times tighter than previous benchmarks. Rather than extrapolating from a broad sample of galaxies, the team focused on 15 of the smallest, most distant and chemically "pristine" galaxies, which act as cosmic time capsules largely untouched by billions of years of stellar evolution. Custom-built MODS spectrographs let researchers analyze more than ten helium lines and fifteen hydrogen lines simultaneously, controlling small systematic errors that become critical once measurements approach sub-percent accuracy. The results, published across a series of five papers in The Astrophysical Journal, sharpen one of cosmology's most fundamental numbers and give scientists a firmer anchor for testing the standard model of the universe's earliest moments, known as Big Bang nucleosynthesis.
Read more →Astronomers pin down the universe's primordial helium content with record-breaking precision
Using 130 hours of observation time on the Large Binocular Telescope, a team including researchers from Ohio State and the University of Minnesota measured the primordial helium abundance, the helium forged in the first few minutes of the universe, to within about 0.5% uncertainty, roughly three times tighter than previous benchmarks. Rather than extrapolating from a broad sample of galaxies, the team focused on 15 of the smallest, most distant and chemically "pristine" galaxies, which act as cosmic time capsules largely untouched by billions of years of stellar evolution. Custom-built MODS spectrographs let researchers analyze more than ten helium lines and fifteen hydrogen lines simultaneously, controlling small systematic errors that become critical once measurements approach sub-percent accuracy. The results, published across a series of five papers in The Astrophysical Journal, sharpen one of cosmology's most fundamental numbers and give scientists a firmer anchor for testing the standard model of the universe's earliest moments, known as Big Bang nucleosynthesis.
Trial finds a hint that daily vitamin C could help people with precancerous blood disorders live longer
The randomized, double-blind, placebo-controlled EVITA trial, which enrolled 109 participants in Denmark and the United States with precancerous blood disorders known as clonal cytopenias, found that a year of daily 1,000-milligram oral vitamin C supplements did not change its primary goal of slowing the growth of abnormal blood cells compared with placebo. But an exploratory follow-up after a median of nearly three years turned up a striking difference in survival: only 11 of the participants assigned vitamin C died, compared with 24 in the placebo group, a statistically significant gap. Participants taking vitamin C also had fewer serious adverse events, 33% versus 57%, and showed changes in inflammatory signaling molecules associated with better outcomes. Independent experts described the trial as well-designed but cautioned that the survival finding needs confirmation in a larger phase 3 study before it could change clinical practice, since the primary endpoint of the trial itself was not met.
Read more →Trial finds a hint that daily vitamin C could help people with precancerous blood disorders live longer
The randomized, double-blind, placebo-controlled EVITA trial, which enrolled 109 participants in Denmark and the United States with precancerous blood disorders known as clonal cytopenias, found that a year of daily 1,000-milligram oral vitamin C supplements did not change its primary goal of slowing the growth of abnormal blood cells compared with placebo. But an exploratory follow-up after a median of nearly three years turned up a striking difference in survival: only 11 of the participants assigned vitamin C died, compared with 24 in the placebo group, a statistically significant gap. Participants taking vitamin C also had fewer serious adverse events, 33% versus 57%, and showed changes in inflammatory signaling molecules associated with better outcomes. Independent experts described the trial as well-designed but cautioned that the survival finding needs confirmation in a larger phase 3 study before it could change clinical practice, since the primary endpoint of the trial itself was not met.