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כתבות אחרונות מאתר 'Phys'
Phys

Single amino acid swap expands nanoparticle vaccine approach to influenza viruses‎

Influenza viruses constantly shapeshift to evade recognition by the immune system. This shapeshifting occurs in critical proteins like hemagglutinin (HA), which controls how the virus attaches to human cells before entering them. Influenza viruses can evade immunity in two major ways: through the gradual accumulation of mutations that make HA harder for the immune system to recognize or through reassortment events that can introduce substantially different viral proteins and potentially lead to flu pandemics. To address this challenge, seasonal flu vaccines remain the primary approach because they can be developed to target the flu viruses circulating most predominantly in a given season.

02:25
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Phys

Algorithm improves detection of differentially expressed genes in large single-cell trajectory data sets‎

Single-cell RNA sequencing (scRNA-seq) is a method for measuring gene expression in individual cells, allowing observation of various cellular processes, including cell differentiation, the cell cycle and stimulus response, for each unique cell instead of averaging across millions of cells. It provides high-resolution snapshots of biological processes. However, it does not track the same cell continuously over time. To address this limitation, trajectory inference approaches have been developed that computationally arrange cellular snapshots along an inferred developmental trajectory known as pseudotime.

02:25
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Phys

Firelight may have sparked human storytelling by extending social hours‎

New research from the University of St Andrews has developed a novel hypothesis of how firelight was critical to the evolution of sophisticated storytelling.

02:11
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Phys

Muddying the waters makes stickleback fish more coordinated, study finds‎

Stickleback fish can change their social behavior to help them find food in cloudy water, according to a new University of Bristol study published in Proceedings of the Royal Society B.

02:11
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Phys

Survey reveals marine biodiversity hotspot needs protection‎

An environmental DNA study by a multi-institutional research collaboration has revealed distinct regions of extraordinary marine biodiversity that can help inform management of a proposed marine park in Western Australia's Exmouth Gulf.

02:04
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Phys

LEDs let archaeologists see the past in a new light‎

An archaeological excavation is a little like eating a layered cake: Once you have removed a layer, you cannot put it back. The problem becomes even trickier if two layers look almost exactly the same. Researchers from Aarhus University and Moesgaard Museum in Denmark have now developed a relatively inexpensive multispectral imaging system that gives archaeologists more ways of looking at the soil before they dig into it.

01:41
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Phys

To promote climate action, emotion may matter more than information‎

Every year, public authorities and nongovernmental organizations spend millions on communication campaigns designed to encourage people to take action on climate change. But which strategies work best? Should campaigns rely on fear or positive messages, prioritize facts or appeal to emotions, and focus on words or visuals?

01:41
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Phys

Giant impact could have formed an intact moon within five hours, simulations suggest‎

New Southwest Research Institute (SwRI) modeling, conducted in collaboration with scientists at the University of Arizona, shows fundamental differences in how the moon may have formed from the giant impact that created the Earth–moon system. The new results used state-of-the-art computational techniques that factor in the material strength of the two colliding planets. These impact simulations could change how researchers understand moon formation and may help constrain the timing of the event. The research is published in The Astrophysical Journal Letters.

01:28
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Phys

Elementary school teachers report increased student hunger and anxiety after universal free school meals ended‎

A recent study published in the Journal of Nutrition Education and Behavior explored elementary school teachers' experiences before and after the end of the federal universal free school meals (UFSM) policy. Researchers found that teachers perceived the policy had helped reduce student hunger and family stress, while its expiration was associated with increased hunger, anxiety about meal costs and decreased participation in school meal programs.

01:28
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Phys

Salt of the Earth: How Egypt's coastal sabkhas tell a story of climate and change‎

Have you ever walked across a salt flat so expansive it feels like another planet? That's what it's like standing in Egypt's coastal sabkhas—those otherworldly landscapes where the ground crunches beneath your feet and the air shimmers with heat. These aren't just barren wastelands; they're living laboratories that record the pulse of our changing climate.

01:01
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