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Comment by Dr. Krishna Kumari Challa 3 hours ago

HEPA air purifiers may boost brain power in adults over 40
One month of in-home HEPA air purifier use led to a 12% improvement in mental flexibility and executive function among adults aged 40 and older, compared to a sham purifier. The cognitive benefit was similar to that seen with increased exercise. The findings suggest HEPA purifiers may help mitigate cognitive impacts of air pollution, particularly for those living near major roadways.

https://www.nature.com/articles/s41598-026-48063-8

Comment by Dr. Krishna Kumari Challa 3 hours ago

How does imagination really work in the brain? New explanation upends what we knew
Imagination operates by modulating and suppressing ongoing spontaneous neural activity in the brain, rather than generating new activity. Visual imagery emerges when feedback signals selectively dampen competing neural patterns, allowing specific mental images to stabilize amid background activity. This mechanism explains why imagined images are typically weaker and more distinct from real perception.

https://psycnet.apa.org/fulltext/2027-53139-001.html

Comment by Dr. Krishna Kumari Challa 3 hours ago

Engineered soil bacterial protein kills colorectal cancer cells by targeting their mitochondria
An engineered protein derived from soil bacteria, combined with a fatty acid to form the NheA-O complex, selectively induces ferroptosis in colorectal cancer cells by targeting and disrupting mitochondrial energy production. This approach bypasses typical tumor cell survival mechanisms, leading to efficient cancer cell death in cell culture models and suggesting a potential new therapeutic strategy.

Naeem Ullah et al, Bacterial protein-oleate complexes induce ferroptosis-like cell death in colorectal cancer cells by disrupting cell membranes and inhibiting the β-catenin-GPX4 axis, Cell Death Discovery (2026). DOI: 10.1038/s41420-026-03097-9

Comment by Dr. Krishna Kumari Challa 3 hours ago

How cells turn mechanical forces into biochemical signals

Cells constantly probe their environments, searching for physical cues that guide their behavior. And yet a cell's response to its environment is always biochemical, mediated by the chemistry of its internal protein machinery. So how does a cell convert mechanical information into a molecular process?

 Researchers have been investigating this riddle for more than a decade. A few years ago, for example, they discovered that when physical forces change the shape of a cell's internal architecture, called the cytoskeleton, it generates chemical signals that instruct the cell how to behave. But the steps between the physical force and the chemical response remained unclear.

Now, thanks to technological advances they developed researchers have shown for the first time that when a motor protein called myosin compresses actin filaments within the cytoskeleton, it squishes the filaments into coils. This deformation is detected by protein sensors associated with cell adhesion, which congregate at specific sites on the cell interior.

Forces generated by myosin are critically important for cells to receive mechanical signals. 

The cytoskeleton helps the cell transmit, receive, and process physical and biochemical information—a dynamic responsiveness that allows cells to interact with the world around them.

A key building material of the cytoskeleton is the actin filament, which powers cellular movement thanks to motor proteins like myosin, which tug, twist, and compress actin.

Tugging on actin filaments with myosin actually helped the actin to bind better to a protein sensor, called alpha-catenin, which builds physical connections between cells. 

If you get rid of myosin, cells can't stick together efficiently or transmit forces or information between them. Everything just falls apart.

Researchers found that compression was the key. This squeezing caused the filaments to turn into spirals—and it was this shape in particular that set off the alpha-catenin sensors, and it was happening in a localized way.

Even if the entire network of myosin is generating tension—or tugging on the filaments—little segments of the network will actually be generating compression based on the random operation of the motors and how they happen to be positioned and firing asynchronously. That's interesting, because it means these subpopulations could have a sort of signaling function."

They also investigated how these coils might form using computer simulations. She ran simulations testing the three forces at play—tension, torsion, and compression—at various magnitudes and in different directions.

No matter the level of force or direction of action, they found the same result: Compression was the key.

Myosin dysfunction is connected to a number of diseases and that myosin inhibitors are in clinical trials for different conditions, including cancers such as glioblastoma.

Myosin forces remodel F-actin for mechanosensitive protein recognition, Nature (2026). DOI: 10.1038/s41586-026-10398-7

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Comment by Dr. Krishna Kumari Challa 5 hours ago

Plants can sense the sound of rain, new study finds

Exposure to rain-like sound vibrations accelerates rice seed germination by 30–40% compared to controls, likely through the dislodgement of statoliths—gravity-sensing organelles—within seed cells. Acoustic vibrations from raindrops are sufficient to stimulate this response, suggesting seeds can sense and respond to natural sounds, potentially conferring an adaptive advantage for optimal growth conditions.
Some seeds may come alive to the sound of rain. In experiments with rice seeds, researchers found that the sound of falling droplets effectively shook the seeds out of a dormant state, stimulating them to germinate at a faster rate compared with seeds that were not exposed to the same sound vibrations.
The team's findings, published in the journal Scientific Reports, are the first direct evidence that plant seeds and seedlings can sense sounds in nature. Their experiments involved submerging rice seeds in shallow water. Rice can germinate in both soil and shallow water. The researchers suspect that many similar seed types may also respond to the sound of rain.

The team worked out a hypothesis to explain how the seeds might be doing this. They found that when a raindrop hits the surface of a puddle or the ground, it generates a sound wave that makes the surroundings vibrate, including any shallowly submerged seeds. These vibrations can be strong enough to dislodge a seed's statoliths, which are tiny gravity-sensing organelles within certain cells of a seed. When these statoliths are jostled, their movement is a signal for seeds and seedlings to grow and sprout.
What this study is saying is that seeds can sense sound in ways that can help them survive. The energy of the rain sound is enough to accelerate a seed's growth.

"Seeds accelerate germination at beneficial planting depths by sensing the sound of rain", Scientific Reports (2026). DOI: 10.1038/s41598-026-44444-1

Comment by Dr. Krishna Kumari Challa 5 hours ago

Microbes contribute a surprisingly large array of proteins in fermented foods
Microbial proteins constitute up to 11% of total protein content and up to 60% of identified proteins in fermented foods, often surpassing substrate-derived proteins. This substantial microbial contribution alters the nutritional and functional profiles of fermented foods and may influence host immune responses or gut microbiota interactions.
A new study examining the proteins found in fermented foods like yogurt, cheese and bread found that a surprisingly large number, and percentage, of microbial proteins contribute to their overall protein content. These microbes have long been used in traditional fermentation processes and are widely associated with the beneficial or probiotic nature of these fermented foods.
The findings highlight the role of microbial proteins in shaping the nutritional and potential health impacts of fermented foods and could also help pave the way to engineering fermented foods with specific microbial profiles that enhance their beneficial effects.
Using a metaproteomics approach, the researchers combined high-resolution liquid chromatography and mass spectrometry to identify all the food- and microbial-derived proteins in 17 fermented and three non-fermented foods. Dairy milk, tofu and wheat bread comprised the non-fermented foods, while the fermented foods included the fermented derivatives of these substrates such as yogurt, brie cheese, sour cream, plain yeast bread, sourdough bread, tempeh, miso and soy sauce.
The striking results showed that microbial proteins contributed up to 11% of the total protein content and up to 60% of the total number of identified proteins in fermented foods.
This shows that microorganisms not only contribute to the fermentation process itself but also to the overall nutritional and functional profile of fermented food by converting substrate proteins into microbial proteins.

Laura Winkler et al, Assessing the diversity and functional profile of the "microbial proteome" in fermented foods, Food & Function (2026). DOI: 10.1039/d5fo05039a

Comment by Dr. Krishna Kumari Challa 5 hours ago

Why does life prefer one 'hand' over the other? New study points to electron spin

A team of scientists has identified a new physical mechanism that could help explain one of the most persistent mysteries in science: why life consistently uses one "handed" version of its molecules and not the other. 

The researchers show that electron spin, a fundamental quantum property, can cause mirror-image molecules to behave differently during dynamic processes, even though they are otherwise identical. The work appears in Science Advances.

Many molecules essential to life come in two mirror-image forms, known as enantiomers. Chemically, these forms are nearly indistinguishable. Yet in living systems, only one version is typically used: amino acids are almost exclusively one type, while sugars follow the opposite pattern.

This phenomenon, known as homochirality, has puzzled scientists for more than a century.

The new study suggests that the answer may lie not in the molecules themselves, but in how they behave when electrons move through them. The researchers found that when electrons pass through chiral molecules, their spin interacts with the molecular structure in a way that is not perfectly symmetric between mirror images.
As a result:
The two forms can produce different levels of spin polarization
These differences can influence how efficiently each form participates in physical and chemical processes
This breaks a long-standing assumption that mirror-image molecules should behave identically in magnitude, differing only in sign.

The study combines theoretical analysis, experiments, and advanced calculations to show that this asymmetry arises from how electron spin aligns within each molecular structure.

Although the two enantiomers have the same energy, their spin-related properties during motion are not exact mirror images, leading to measurable differences in behavior. Importantly, these differences appear in dynamic processes, such as electron transport and interactions with magnetic environments, rather than in static properties.

These findings offer a possible route toward understanding how one molecular "hand" came to dominate in biology. If one enantiomer consistently interacts more efficiently with its environment under spin-dependent conditions, even small differences could accumulate over time, leading to a global preference. This provides a new perspective on how physical processes, rather than purely chemical ones, may have influenced the earliest stages of biological development.

The work opens new directions for research at the intersection of physics, chemistry, and biology:
Exploring how spin-dependent effects influence chemical reactions
Designing materials that exploit chirality and electron spin
Investigating how quantum properties shape biological systems
More broadly, the study suggests that symmetry in chemistry may be more subtle—and more easily broken—than previously thought.

Yossi Paltiel et al, Dynamic Breaking of Mirror Symmetry in Spin-Dependent Electron Transport through Chiral Media Causes Enantiomeric Excesses, Science Advances (2026). DOI: 10.1126/sciadv.aec9325. www.science.org/doi/10.1126/sciadv.aec9325

Comment by Dr. Krishna Kumari Challa 5 hours ago

Monkeys in Gibraltar self-medicate with soil to help them digest tourists' junk food

Monkeys in a tourism hotspot have learned that swallowing dirt can quell the upset stomachs caused by overconsumption of sweet and salty snacks fed to them by holidaymakers, a new study suggests. Troops of macaques living on Gibraltar—the only free-ranging monkey population in Europe—have been scientifically observed for the first time regularly engaging in geophagy, the practice of intentionally ingesting soil. The work appears in Scientific Reports.

Researchers monitoring monkey groups across the Rock of Gibraltar have tracked instances of geophagy, and found that animals in frequent contact with tourists eat far more dirt, and that dirt-eating rates are higher during peak holiday season. The scientists think that the chocolate, chips and ice cream offered by or stolen from tourists—a substantial part of some Gibraltar macaques' diets—are disrupting gut microbiome composition in the animals and leading to changes in their culture.

Eating soil may help rebalance monkey stomachs by providing bacteria and minerals absent from junk food, say researchers, and it is likely to help line the gut and soothe or prevent irritation caused by too much sugar and fat.

Scientists think this behavior is transmitted socially, as different troops have preferences for certain types of soil, and say it is an example of an emerging animal culture and "tradition" created by living in a human-dominated environment.

J. Frater et al, Geophagy in Gibraltar Barbary macaques is a primate tradition anthropogenically induced, Scientific Reports (2026). DOI: 10.1038/s41598-026-44607-0

Comment by Dr. Krishna Kumari Challa 6 hours ago

Anemia in adults 60 and older linked to 66% higher dementia risk

A new study has found that the effects of anemia—a condition caused by a lack of hemoglobin needed to carry oxygen to organs and tissues—may stretch beyond fatigue, shortness of breath, and pale skin. They reach into the brain, raising the risk of dementia and linking to higher levels of biomarkers associated with Alzheimer's disease (AD) and neurodegeneration.

Researchers  set up a long-term study tracking 2,282 dementia-free adults aged 60 and above who live in Stockholm, Sweden. At the start of the study, the team measured hemoglobin levels and biomarkers associated with neurodegenerative disorders in all participants. Over the years, the team followed up with the group, checking in every 3 to 6 years to see how their health evolved.
When researchers dug into more than ten years of data, they found that people who had anemia at the start were 66% more likely to develop dementia over time. Within the follow-up of 9.3 years, 362 participants had developed dementia. The numbers also pointed to a strong link between low hemoglobin and higher levels of blood biomarkers tied to Alzheimer's disease, including proteins linked to brain cell damage and inflammation. This association was stronger in men than in women.

Martina Valletta et al, Anemia and Blood Biomarkers of Alzheimer Disease in Dementia Development, JAMA Network Open (2026). DOI: 10.1001/jamanetworkopen.2026.4029

Comment by Dr. Krishna Kumari Challa 6 hours ago

It isn't just water: The hidden force inside tsunamis can enhance the danger they pose

Mud-rich coastlines could face a greater tsunami risk, at least that may have been the case for the 2011 Tōhoku-oki tsunami that killed more than 19,000 people and led to the Fukushima Daiichi nuclear disaster. According to a new study published in the Journal of the Geological Society, mud may have made the catastrophic ocean waves more destructive than they might otherwise have been.

On 11 March 2011, a powerful earthquake off the coast of Honshu, Japan's main island, triggered a massive tsunami. A wall of water swept away boats, cars, and buildings as it surged inland.

As the tsunami moved across the land, it picked up large amounts of clay and silt and became much denser, forming what researchers call a debritic head (a mud-rich front that behaves more like slurry than clear water). Mud is heavier than water, and when this sediment-rich moving mass hit buildings, the force was far greater than standard flood models (that assume clear water) predict.

The researchers also found that this fast-moving tide of debris was eroding the ground for at least 2 kilometers inland, meaning it was continually picking up sediment.

"This evidence shows that a highly cohesive flow with a dense debritic head formed in the mid-shore region, transforming from an initially turbulent flow through the entrainment of cohesive material," wrote the study authors in their paper.

The team shows how the mud-carrying wave likely exerted more powerful destructive forces. As a result, they think debritic heads should be taken into account when developing tsunami hazard assessments.

"The altered hydrodynamics and the greater force exerted by a dense debritic head highlight the need to incorporate debritic heads into tsunami hazard assessments on mud-rich coastlines, where the hazard will be enhanced."

Patrick D. Sharrocks et al, Debritic head formation during the Tōhoku-oki 2011 tsunami reveals enhanced risk in mud-rich coastlines, Journal of the Geological Society (2026). DOI: 10.1144/jgs2025-161

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