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Comment by Dr. Krishna Kumari Challa 8 minutes ago

A smarter antibody could skip the fetus
Researchers have engineered a possible way around the risk some antibody drugs pose in pregnancy. These drugs, used against cancer, autoimmune disease and migraines, are hard to use safely in pregnancy because they are actively carried to the fetus via a receptor called FcRn. But the process has a quirk: mouse models and human tissue showed that the receptor binds to both IgG antibodies — which are used in the majority of approved antibody therapies — and albumin, but only shuttles the antibody across the placenta. By fusing therapeutic antibodies to albumin, the team made drugs that reached the fetus far less and reduced adverse events in mice.

https://www.science.org/doi/10.1126/sciimmunol.aee5151?utm_source=L...

https://www.genengnews.com/topics/drug-discovery/albumin-fused-anti...

Comment by Dr. Krishna Kumari Challa 31 minutes ago

Why does salmonella cause serious illness in some people but not others?
Salmonella usually remains in the gut, but some strains can survive within immune cells and spread to the bloodstream, potentially causing sepsis. Severe invasive disease depends on bacterial type and strain, infectious dose, age, immune status and underlying conditions. Hospitalization data may overrepresent severe cases and cannot alone establish unusual strain virulence.

original article.

Comment by Dr. Krishna Kumari Challa 1 hour ago

A new transmissible cancer in bullhead catfish
Genomic analysis showed melanoma tumours in brown bullhead catfish are clonally related to each other rather than to their hosts, indicating a transmissible cancer, brown bullhead transmissible melanoma. Historical reports suggest similar lesions may be longstanding and widespread, but their relationship to this disease is unconfirmed.

transmissible cancer.

original article.

Comment by Dr. Krishna Kumari Challa 2 hours ago

Is the laundry still damp, or just cold? Why your skin can't tell the difference

Humans lack dedicated wetness receptors; perceived wetness arises from integrated cold, friction, pressure, and contextual sensory signals. Cold dry laundry can mimic dampness because both activate cold receptors. Rubbing, squeezing, visual inspection, or warming fabric can improve discrimination.

original article.

Comment by Dr. Krishna Kumari Challa 2 hours ago

Why do we get sleepy? How neurons control sleep drive

Why does staying awake inevitably make us sleepy? Researchers have identified neuronal populations in the brains of mice that become activated during prolonged wakefulness and are crucial for sleep drive. Their findings provide new insights into how the brain generates the need for sleep.
After a long day or a sleepless night, the urge to sleep becomes almost impossible to resist. This increasing sleep pressure, also known as sleep drive, ensures that prolonged wakefulness is followed by deeper and longer recovery sleep. As sleep is essential for survival, scientists have long been investigating how the brain keeps track of time spent awake and translates it into the need for sleep.
They now have identified specific neurons that are crucial for this balanced relationship between sleep and wakefulness. This is an important missing piece of the puzzle in understanding why we become sleepy.
To identify the brain regions involved, the researchers compared brain activation patterns in mice during normal sleep-wake cycles, sleep deprivation and recovery sleep. This highlighted specific brain areas that reflected time spent awake. Within one of these regions, they further identified two distinct neuronal populations that influence sleep drive: GABAergic and serotonergic neurons in the brainstem. The activation of both neuronal populations increased the longer the animals stayed awake and declined again after sleep onset.

The researchers next asked whether these neuronal populations merely reflect wakefulness or actively generate a compensatory response to sleep. When both populations were artificially activated, mice slept longer and more deeply, displaying a form of recovery sleep that normally follows prolonged wakefulness. In contrast, inhibiting these neurons strongly reduced sleep and allowed animals to maintain alert wakefulness.
These neurons do not simply signal that an animal has been awake. The experiments show that they are crucial to promote sleep, and that they may be key components of the neural circuitry that generates sleep drive. The findings therefore provide one of the clearest demonstrations to date that specific wake-active neurons increase the drive to sleep rather than merely responding to wakefulness.
Further experiments showed that long-term inhibition of the two neuronal populations substantially reduced the need for sleep, with mice sleeping approximately 70% less than usual. Unexpectedly, most of these animals did not exhibit some of the severe behavioural impairments that typically accompany sleep deprivation. In other words, these neurons appear to determine not only how much the animals sleep but also how strongly their need for sleep builds over time.
Understanding how the brain generates sleep drive would provide entirely new opportunities for sleep research.

William Joo et al, Wake-activated neuronal populations that regulate sleep drive., Nature (2026). DOI: 10.1038/s41586-026-10928-3

Comment by Dr. Krishna Kumari Challa 3 hours ago

Link between whale calls and special relativity

For a more precise and consistent way to detect the presence of whales, oceanographers rarely rely on sight.
Sound from a fin whale can be heard from 100 kilometers (62 miles) away underwater with a single hydrophone. Because those calls travel so far, we can use them to pinpoint where an animal is by comparing when its sound reaches receivers spread across the seafloor.
But there's a catch: If they were trying to track a nearby whale using just standard physics, they'd probably place the animal in the wrong spot—off by hundreds of meters.

In a paper recently published in the journal Physical Review E, researchers offer a potential explanation for why this occurs: The humble whale call is, improbably, tangled up with the same speed limits Einstein deduced from the universe. Their findings could improve whale tracking for conservationists.
When a whale calls, the sound doesn't take a single path to each receiver. Some of the sound travels directly to a receiver, while some of it ricochets off the ocean surface first, arriving fashionably late.
That delay can put the two signals out of phase, causing them to interfere with one another and shifting when sound appears to arrive at a receiver.
The researchers stumbled onto this while refining a computer program meant to calculate the correct speed of sound for his whale-tracking equations. The results were surprising.

The first time, they got a number that was around 1,000 meters per second, well below the roughly 1,500 meters per second that sound normally travels in seawater. And then, further on, they got values that were sometimes 3,000 meters per second.

After examining the software for a few hours, they discovered that the behaviour wasn't a coding error, but a physical effect caused when a receiver picked up both the direct signal and its reflected echo when a whale was near the ocean's surface.
Physicists call this "temporal interference," the same phenomenon that causes TV broadcasts at your home antenna to fade out because two paths arrive out of phase or out of sync. The interference can also shift the peak of the energy earlier and break the speed limit.

What appears to speed up is not the signal carrying information but the position of the signal's strongest peak. That crucial distinction is the reason their finding aligns with Einstein's theory.

For more than a century, physicists have known that waves can sometimes appear to travel faster than light when their shape changes. But the information encoded in those waves still cannot travel faster than light—the central principle of Einstein's theory of special relativity.

John L. Spiesberger et al, Supersonic and superluminal energy and speed of information via temporal interference in a dispersionless environment, Physical Review E (2026). DOI: 10.1103/1mth-rs2j. On arXiv: arxiv.org/abs/2510.20060

Comment by Dr. Krishna Kumari Challa yesterday

A new mathematical tool to uncover 'who eats whom' in nature

Understanding "who eats whom" is the key to keeping our oceans alive—and our dinner plates full. However, this invisible network that makes up the food chain can unravel with the pull of just one thread. Overfish one species, and its predators starve. Cut off a tiny prey species, and the entire food chain collapses—including us.
The intricacies of this web have remained a mystery because traditional ecological research is almost forensic, incredibly slow and strictly limited to the number of species scientists can physically collect during fieldwork. To find a better way, marine scientists had to look outside the ocean entirely and delve into an unexpected specialty: mathematics.
New research published in Methods in Ecology and Evolution on Aug. 6, 2026, blends marine science and engineering mathematics to solve the "impossible" problem of this chaotic web. The resulting algorithm reconstructed invisible ocean networks with 80% accuracy, essentially turning the invisible visible.
The algorithm reconstructed invisible ocean networks with more than 80% accuracy. Even better, its calculations of the percentage of each prey that predators ate had an error rate of less than 5%. Even when fed "noisy" or imperfect field data, the system remained perfectly steady.

Ettore Barbieri et al, The superposition method for the reconstruction of food webs, Methods in Ecology and Evolution (2026). DOI: 10.1111/2041-210x.70376

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Comment by Dr. Krishna Kumari Challa yesterday

The team used these animals in a series of tests that exposed them to different wavelengths of light while using a biometer to measure eye shape and axial length and an autorefractor to measure refractive changes over time.

Earlier work in mice suggested that violet light near 380 nanometers could suppress myopia and revealed that opsin 5 (OPN5), a light-sensing receptor, was required for this response. But that wavelength did not work in tree shrews because, as in humans, the ocular lens blocks most light below about 400 nanometers.

Human lenses, and now we know tree shrew lenses, don't transmit a lot of light in the ultraviolet spectrum.
The findings support a broader idea that modern indoor life has changed the lighting environment in ways that affect children's eye development. Standard white LEDs typically have a peak around 450 nanometers and emit substantial longer-wavelength light that supports vision. But they provide little of the indigo light that appears to stimulate nonvisual opsins—light-sensitive pathways involved in biological processes beyond image formation.
We evolved outside in the full-spectrum light provided by our sun. When we live inside, we don't get all the wavelengths the eye needs for normal refractive development, and so we get myopia. That's the basic message of this research paper.
One way to prevent myopia would be to encourage children to spend much more time outside, where their eyes can focus across a wider range of near and distant objects while their growing bodies are bathed in full-spectrum sunlight. But reversing the course of our increasingly technical culture appears unlikely.

Another way to prevent myopia would be to improve lighting systems.

Prevention of myopia in a near-primate by supplemental indigo light suggests a hypothesis for the myopia boom, Cell Reports Medicine (2026). DOI: 10.1016/j.xcrm.2026.102999. www.cell.com/cell-reports-medi … 2666-3791(26)00416-7

Part 2

Comment by Dr. Krishna Kumari Challa yesterday

Restoring a missing slice of sunshine to indoor light may help prevent myopia

Myopia, or nearsightedness, develops when the eye grows too long from front to back. This prevents images from focusing directly on the retina in the back of the eye, causing distant objects to appear blurry.

Myopia usually begins in childhood and can progress through adolescence. Beyond the need for glasses or contact lenses, high myopia increases the risk of vision-threatening complications later in life, including retinal detachment, glaucoma and macular degeneration.

Research has already shown that the more time children spend playing with screens indoors instead of outdoors, the more likely they are to develop myopia. In fact, some experts predict that nearly 5 billion people (or 50% of the world's population) will be nearsighted by 2050.
Now, a new study led by vision researchers  suggests that myopia can be prevented with improved indoor lighting.

Details were published online Aug. 18, 2026, in Cell Reports Medicine.

The research focuses on indigo light—a short-wavelength light that is abundant in sunlight but poorly represented in standard white LED lighting. In experiments involving tree shrews—an animal model with a human-like visual system—the team demonstrated that exposure to indigo light completely prevented nearsightedness from developing.
The study used tree shrews because their eyes share anatomical and optical features with human eyes.
Part 1

Comment by Dr. Krishna Kumari Challa yesterday

The findings of the study change the way we understand the evolution of the human pelvis. It is not the Neanderthal pelvis that is the anomaly requiring explanation. Rather, it is the pelvis of the modern human male. The mechanism that evolved within the human male represents the evolutionary innovation.

The researchers note that the study presents a new biomechanical model that may explain a substantial part of the human pelvis's sexual dimorphism, the anatomical differences between females and males.

Yoel Rak et al, Neandertal pelvis reveals specialized walking apparatus in human males, Scientific Reports (2026). DOI: 10.1038/s41598-026-59915-8

Part 2

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