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Comment by Dr. Krishna Kumari Challa yesterday

Hidden sex differences may explain why lupus strikes women far more often

Analysis of over 1.25 million immune cells from nearly 1,000 individuals identified more than 1,000 sex-specific genetic switches, primarily on autosomes, that regulate immune cell activity differently in males and females. Females showed higher inflammatory pathway activity, linked to increased autoimmune disease risk, including lupus, while males had more monocytes and less inflammatory priming. These findings highlight the need for sex-specific approaches in autoimmune disease research and treatment.

https://medicalxpress.com/news/2026-05-hidden-sex-differences-lupus...

Comment by Dr. Krishna Kumari Challa yesterday

Ultrasound waves rupture COVID-19 and flu viruses without damaging cells

Researchers have discovered that high-frequency ultrasound waves similar to those used in medical exams can eliminate viruses such as SARS-CoV-2 and H1N1 without damaging human cells. In an article published in Scientific Reports, they describe how the phenomenon, known as acoustic resonance, causes structural changes in viral particles until they rupture and become inactivated.
By degrading the structure of the pathogen, the protective membrane of the virus called the envelope bursts and deforms, preventing the virus from invading human cells

High-frequency ultrasound waves (3–20 MHz) induce acoustic resonance in spherical, enveloped viruses such as SARS-CoV-2 and H1N1, causing structural rupture and inactivation without damaging human cells. The effect is geometry-dependent and not influenced by viral mutations. This selective mechanism offers a potential antiviral strategy distinct from existing decontamination methods.
Ultrasound-mediated inactivation of enveloped viruses opens up a new treatment possibility for viral diseases.
The discovery surprised the researchers because it contradicts classical physics theories, as the wavelength of ultrasound is much longer than the size of the virus. In theory, this difference in size would prevent interaction.

The phenomenon is entirely geometric. Spherical particles, such as many enveloped viruses, absorb ultrasound wave energy more effectively. It's that accumulation of energy inside the particle that causes changes in the structure of the viral envelope until it ruptures. Therefore, if viruses were triangular or square, they wouldn't undergo the same 'popcorn effect' of acoustic resonance.
Since the process depends strictly on the shape of the viral particle and not on genetic mutations, variants such as those observed during the pandemic (omicron and delta, for example) do not affect the effectiveness of the technique.

Flavio P. Veras et al, Ultrasound effectively destabilizes and disrupts the structural integrity of enveloped respiratory viruses, Scientific Reports (2026). DOI: 10.1038/s41598-026-37584-x

Naruna E. Rodrigues et al, Trapped Acoustic Energy and Resonances in Spherical Scatterers, Brazilian Journal of Physics (2026). DOI: 10.1007/s13538-026-02020-y

Comment by Dr. Krishna Kumari Challa yesterday

Crash data reveal women face 60% higher injury risk than men

Women have a 60% higher risk of injury in car accidents compared to men, with the disparity especially pronounced among female passengers and older women. Current vehicle safety systems and test standards, based on male body models, inadequately protect women due to anatomical and biomechanical differences. Recommendations include developing adaptive safety systems, using more realistic human models in testing, and improving occupant education on proper seat and belt positioning.

https://www.bmimi.gv.at/verkehrssicherheit/beratung-foerderung/vsf/...

Comment by Dr. Krishna Kumari Challa yesterday

While the sight is mesmerizing, it may be a "trap" caused by human activity. The researchers noted that the sex ratio, mostly females, many of whom were carrying eggs, suggests this isn't a mating ritual. Instead, it appears to be a disruption of their natural instincts caused by artificial light at night (ALAN).

These "isopod mills" may have dire consequences. In one observation, a centipede was seen preying on the distracted, swirling mass. By drawing these creatures out of their natural shelters and trapping them in a loop, light pollution may be making them easy targets for predators and wasting the energy they need for survival.

The study highlights how even small changes in our environment, like the installation of a streetlight, can fundamentally alter the ancient behavioural patterns of the world's smallest inhabitants.

Idan Sheizaf et al, A Novel Light‐Induced Collective Circular Movement in Armadillo sordidus Isopods, Ecology and Evolution (2026). DOI: 10.1002/ece3.73487

Part 2

Comment by Dr. Krishna Kumari Challa yesterday

Streetlights trigger bizarre 'death spirals' in thousands of isopods, scientists find

A new study  has documented a never-before-seen behavioural phenomenon: thousands of land-dwelling isopods forming massive, synchronized circular processions. This behaviour appears to be an unintended consequence of artificial light at night.

The study, published in Ecology and Evolution, explores how these small creatures, terrestrial relatives of crabs and shrimp, also known as "woodlice" or "pill bugs," abandon their typical solitary lives in sheltered areas to join swirling "mills" that can include over 5,000 individuals in a single group.

To understand what was driving this strange behavior, the team tested several environmental factors, including magnetic fields and different types of light:
Magnetism: Because the Golan Heights has unique magnetic properties, the team placed strong magnets near the isopods to see if it disrupted their pathing. The isopods showed no reaction, maintaining their circular march.
Ultraviolet light: Testing with UV flashlights attracted only a small fraction of the population and failed to trigger any circular movement.
White light: This proved to be the "smoking gun." When a white lamp was placed perpendicular to the ground, it consistently induced the mass circular motion.
The researchers discovered that the geometry of the light is the key. A vertical light beam creates a circular "boundary" of illumination on the ground. The isopods, attracted to the light, begin walking along this photic edge. Once the population density hits a certain threshold, the individual movements turn into a collective, self-sustaining swirl.

part 1

Comment by Dr. Krishna Kumari Challa on Thursday

Chronic sunlight exposure can disrupt body clocks in skin

Years of chronic exposure of human skin to sunlight strongly disrupts its body-clock rhythm, according to a pioneering study

Chronic sunlight exposure disrupts the circadian rhythms of human skin, weakening the temporal coordination of gene activity, particularly those involved in DNA repair. Sun-exposed skin shows altered daily gene expression patterns and reduced rhythmicity compared to protected skin, which may contribute to photoaging and impaired skin health. These findings suggest that skin chronobiology is significantly affected by long-term UV exposure.

The findings could explain how ultraviolet (UV) light triggers inflammation and damage in exposed skin, so-called photoaging, which breaks down its supportive structure, altering how its cells behave.

Published in the Journal of Investigative Dermatology, the study could have important implications on skin health and the design of skincare products that takes into account the time of day when they are applied.

The study is the first to directly compare daily rhythms of genes being turned on and off in human skin exposed to and protected from sunlight over half a century.

Almost all organs—including skin—exhibit 24 hourly rhythms which allows the body to anticipate and adapt to changes associated with the light-dark cycle, including daily exposure to solar radiation.

Michael M. Saint-Antoine et al, Comparative circadian transcriptome analysis reveals dampened and phase-advanced rhythms in sun-exposed human skin, Journal of Investigative Dermatology (2026). DOI: 10.1016/j.jid.2026.03.038

Comment by Dr. Krishna Kumari Challa on Thursday

Fewer insects, fewer nutritious crops: Pollinator decline puts human health at risk

Biodiversity loss is directly threatening human health and welfare, according to new research.
It's long been known that insect pollinators are vital for producing many of the fruits, vegetables and pulses that supply essential vitamins and minerals in our diets.

Declines in insect pollinators significantly reduce crop yields, leading to lower intake of essential nutrients such as vitamin A, folate, and vitamin E, and decrease farming income, thereby increasing risks of malnutrition, illness, and poverty among smallholder farmers. Supporting pollinator populations through local actions like planting wildflowers and reducing pesticide use can enhance both nutrition and economic resilience, highlighting the critical link between biodiversity and human health.

Working in ten smallholder farming villages and their surrounding landscapes in Nepal, the study traced the full chain of connections between wild pollinators, crop yields and the nutrients families rely on.

By tracking diets, crop nutrients and the insects visiting those crops over a year, the research team showed how pollinators directly support both nutrition and livelihoods.

The study found insect pollinators are crucial for both the nutrition and income of farming families, and pollinators were responsible for 44% of people's farming income and contributed more than 20% of their intake of vitamin A, folate and vitamin E.

When pollinators decline, families risk poorer nutrition, leading to higher vulnerability to illness and infections, and deeper cycles of poverty and poor health. One quarter of the global population currently suffers from this "hidden hunger."

The research showed there is real potential for positive change—when communities support pollinators, their nutrition and income can improve. Simple steps like planting wildflowers, using fewer pesticides or keeping native bees can help boost pollinator numbers, strengthening both nature and people's well-being.

Thomas Timberlake, Pollinators support the nutrition and income of vulnerable communities, Nature (2026). DOI: 10.1038/s41586-026-10421-x. www.nature.com/articles/s41586-026-10421-x

Comment by Dr. Krishna Kumari Challa on Thursday

Light without electricity? Glowing algae could make it possible

Bioluminescent algae Pyrocystis lunula can be chemically stimulated to emit sustained light for up to 25 minutes, especially under acidic conditions. Embedding these algae in hydrogels and 3D-printing them into structures enables long-lasting, controllable luminescence, with algae retaining 75% brightness after four weeks. This approach offers potential for sustainable lighting, environmental sensing, and carbon sequestration.
Researchers exposed the algae to an acidic solution with a pH of 4, similar to that of tomato juice, and a basic solution with a pH of 10, comparable to mild soap.

They found that both environments could trigger light production in P. lunula. In the acidic condition, the algae could stay aglow for as long as 25 minutes, with light appearing bright and concentrated. In the basic condition, the glow was more diffused and short-lived.
To turn these glowing algae into usable materials, the researchers embedded them into a naturally derived hydrogel, a type of water-based gel material. They then used 3D printing to shape the material into structures and shapes, from a crescent pattern to a CU Buffalo logo.

By exposing the structures to the acidic or basic solution, they prompted the P. lunula inside to emit light, illuminating the entire structure in a blue glow.

Inside these printed structures, the algae remained alive for weeks. The acidic condition worked best, with P. lunula in these 3D-printed structures retaining 75% of their brightness even after four weeks.
The findings could have wide applications beyond making eye-catching designs. These living materials could someday help light up autonomous robots for deep-sea or space exploration without the need for batteries.

Chemical Stimulation Sustains Bioluminescence of Living Light Materials, Science Advances (2026). DOI: 10.1126/sciadv.aee3907

Comment by Dr. Krishna Kumari Challa on Wednesday

Both very low and very high heart rates are significantly associated with stroke risk, study finds

A study presented at the European Stroke Organization Conference (ESOC) 2026 suggests that both very low and very high resting heart rates are linked with an increased risk of stroke. As the largest population-level study to examine this relationship, the findings challenge the assumption that lower heart rates are always a sign of good cardiovascular fitness and carry no risk.
Both very low (<50 bpm) and very high (≥90 bpm) resting heart rates are independently associated with increased stroke risk, forming a U-shaped relationship, with the lowest risk at 60–69 bpm. This association persists after adjusting for major risk factors and is evident only in individuals without atrial fibrillation. Low heart rates are mainly linked to ischemic stroke, while high rates are associated with both ischemic and hemorrhagic stroke. In an analysis of the UK Biobank, researchers followed 460,000 participants for an average of 14 years, during which 12,290 strokes occurred. Analyses were adjusted for age, sex and cardiovascular risk factors, including atrial fibrillation—a heart condition that causes an irregular heartbeat and is a major cause of stroke. Stroke risk was lowest at resting heart rates of 60 to 69 beats per minute (bpm) but increased at both extremes—below 50 bpm and at or above 90 bpm—forming a clear U-shaped pattern. At these extremes, stroke risk was 25% higher in those with very low heart rates and 45% higher in those with very high heart rates. Importantly, in the overall population, this relationship remained after adjustment for established stroke risk factors including hypertension, diabetes and atrial fibrillation, suggesting it reflects a genuine biological signal. However, when participants were analyzed separately, the pattern was only seen in people without atrial fibrillation. In those with the condition, the relationship was not apparent. This is likely because atrial fibrillation is such a strong risk factor for stroke, increasing risk by around fivefold, that it outweighs the contribution of heart rate and limits our ability to detect its effect. Heart rate was therefore most informative in people without atrial fibrillation, where it may provide a valuable additional tool for identifying and stratifying stroke risk. The researchers also explored the potential mechanisms underlying the relationship between heart rate and stroke. Very low heart rates were primarily associated with ischemic stroke. This would be consistent with the hypothesis that very low heart rates could be associated with reduced blood flow to the brain by prolonging the relaxation phase between heartbeats. In contrast, elevated heart rates were associated with both ischemic and hemorrhagic stroke and may suggest increased stress on blood vessel walls that could contribute to both ischemic injury and a greater predisposition to bleeding.

Penn, D., et al. Reduced and elevated resting heart rates predict risk of stroke, independently of atrial fibrillation: A UK Biobank analysis. Oral presentation. European Stroke Organization Conference (ESOC) 2026.

Comment by Dr. Krishna Kumari Challa on Wednesday

Early-life chemical exposure may leave extra X and Y chromosomes in sperm

An estimated 7% of all men are affected by infertility. Multiple animal studies indicate that exposure to persistent environmental chemicals in early life can negatively impact male reproductive health, and now a human study suggests the same.
Prenatal and early-life exposure to organochlorines (PCBs) and perfluorinated compounds (PFASs) is associated with increased sperm aneuploidy, specifically extra X and Y chromosomes, in adult men. Elevated PCB levels correlated mainly with additional Y chromosomes, while PFAS exposure was linked to both extra X and Y chromosomes, indicating enduring impacts on sperm genetic integrity.
Normal sperm contain either an X (i.e., the designated chromosome for females) or Y (i.e., the one present in males) chromosome. PCB concentration in blood samples was associated mainly with having an additional Y chromosome, while PFAS exposure was consistently associated with both extra Y and X chromosomes.

Researchers theorize that PCB exposure could be from a maternal diet of contaminated seafood. PFAS exposure was likely due to environmental pollutants in food, water, and air.

Melissa J. Perry et al, In utero and childhood exposure to organochlorines and perfluorinated chemicals in relation to sperm aneuploidy in adulthood, Environmental Health (2026). DOI: 10.1186/s12940-026-01303-w

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