All USA & Canada articles – Page 3
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NewsAspens ‘remember’ past drought in their leaves
Drought may leave more than narrow rings inside a tree trunk. New research suggests quaking aspen can retain a chemical ‘memory’ of dry years, changing the defensive compounds in their leaves and reshaping the fungal communities that live on them long after soils have rewetted.
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NewsAn unusual bacterial defence system hides a powerful molecular switch
Researchers have uncovered a bacterial immune system that appears to work backwards. Unlike known retrons, which keep a toxin suppressed until infection, type VI retrons use phage-triggered DNA production to switch toxin activity on, revealing an unusually complex defence strategy that could inspire new gene-editing tools and antimicrobials.
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NewsCoral heat tolerance depends on species and location
Not all corals cope with rising ocean temperatures in the same way. New research shows that heat tolerance can vary sharply between species and even between nearby populations, with some corals from cooler, more exposed reefs proving unexpectedly resilient to thermal stress.
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NewsResearchers explore link between gut, brain health for people with HIV
Oregon Health & Science University researchers have secured a $5.8 million, five-year federal award to investigate whether damage to the gastrointestinal tract contributes to neuroinflammation in people living with HIV — raising the potential for new treatments to preserve brain function in people with HIV and older adults.
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NewsResearchers target Zika-related eye damage with new antiviral strategies
Zika virus can damage the developing retina and optic nerve, leaving babies with lifelong vision problems. Researchers have now received $2.7 million to uncover how the virus disrupts eye development and test drug candidates that could protect vision, with some compounds also showing activity against dengue and West Nile viruses.
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NewsMount Sinai awarded five-year, $20.7 million vaccine development agreement to advance next-generation technologies against respiratory threats
Researchers at the Icahn School of Medicine at Mount Sinai have been awarded a five-year project agreement to develop Vaccine Immunoengineering for Targeted Antigen Presentation and Layered Control (VITAL), a research program exploring an improved approach to vaccination against respiratory pathogens.
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NewsBacteria DNA has evolved to withstand copper
Marine bacteria have evolved to bypass the copper-based coatings placed under ships to stop the growth of barnacles, algae, and other marine life. This necessitates new methods for managing biofouling — the unwanted accumulation of marine organisms — on ship hulls.
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NewsElephants continue to shape the savanna even after death
Researchers who studied the sites of elephant carcasses in South Africa’s Kruger National Park discovered that decomposition creates nutrient hotspots that can persist on the landscape for years, possibly decades. This flush of nutrients fuels microbial activity and plant vigor, which attracts herbivores to the site long after the visual signs of the elephant have disappeared.
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NewsNon-profit offers new front in the fight against pandemics
From AI-powered disease detection to stronger global health networks, Eric and Wendy Schmidt launch a new nonprofit to help the world identify emerging threats and respond before outbreaks escalate.
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NewsResearchers uncover blueprint for more sustainable agriculture
Researchers have revealed an entirely unexpected blueprint for how one of the oldest microbes on Earth processes nitrogen to create ammonia, the building block of fertilizer. They uncovered a previously unknown structure in a key enzyme responsible for biological nitrogen fixation.
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NewsCould a vaccine adjuvant help prepare for future pandemics?
A study in mice shows that K3-SPG can activate innate immunity, offering potential temporary defense against respiratory viruses while vaccines are developed.
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NewsThe gooier marine snow is, the better it is at transporting carbon, new study finds
Scientists have revealed that the viscosity of marine snow can have a major impact on how quickly it’s broken down and how far it sinks, factors that influence how much carbon it transports to the deep ocean. They found that gooey marine snow can shuttle more than six times the carbon to the deep ocean than less viscous particles.
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NewsValue-aligned messages increased COVID-19 vaccination intentions, study finds
Vaccine-hesitant adults were more likely to consider getting a COVID-19 vaccine when public health messages acknowledged distrust of government and affirmed values such as personal liberty, a new study found.
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NewsWhat makes hantaviruses jump from rodents to humans?
Why do some hantaviruses jump from rodents to humans while others remain largely confined to wildlife? A new study will combine viral genetics, climate data and wildlife ecology to uncover the conditions that drive spillover and help identify where future outbreaks are most likely to emerge.
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NewsCommon airway bacterium may help prepare lungs to fight pneumonia, study finds
A study found that exposure to Prevotella melaninogenica, a type of bacteria commonly found in healthy airways, changed the behavior of immune cells in the lungs of mice. When the mice were later exposed to Streptococcus pneumoniae, a leading cause of bacterial pneumonia, their immune systems were better able to recognize, engulf and clear the bacteria.
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NewsGut microbes across continents trace ancient human migration
A new study has attempted to answer the question of whether homo sapiens hosted a characteristic and diverse microbiome going back millennia. Gaining insight into which, if any, long-term residents of the microbiome co-evolved with humans could point to ways to investigate how the loss of microbial diversity through industrialization impacts human biology.
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NewsStudy may explain why IBD patients react to foods they once tolerated
A new study finds that gut inflammation can change the way gut bacteria break down food — possibly triggering immune reactions to foods that were previously fine to eat. The findings may help explain why so many people with inflammatory bowel disease (IBD) react badly to foods like dairy or gluten, even in remission.
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NewsPenguin poo is melting Antarctic snow by keeping algae green
Penguin poo is fertilizing snow algae blooms along the Antarctic Peninsula, feeding dense green algae patches along the coastline, a new study shows. These expanding stretches of green snow melt faster than clean, white snow, potentially speeding up the spread of snow- and ice- free areas of Antarctica.
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NewsDistinct malaria parasites “hidden in plain sight” may contribute to human disease protection
A new study that investigates the genetics of people and malaria parasites has found that people with the sickle cell variant are almost exclusively infected by a distinct variety of malaria parasites, which might contribute to their lower rates of disease.
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NewsResearchers publish clinical data for rapid diagnostic urine test to detect invasive aspergillosis
Through long-standing research, which has been supported by the National Institutes of Health, investigators at Johns Hopkins Medicine have advanced insights into ways to better detect invasive aspergillosis (IA). Caused by mold, the infection is uncommon in the general population but can create significant health risks for people with underlying ...