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Comment by Dr. Krishna Kumari Challa 9 hours ago

Smart combinations of antibiotics can slow down resistance

When a bacterium becomes resistant to one antibiotic, it may sometimes become more sensitive to another. This biological side-effect offers an unexpected opportunity in the fight against antibiotic resistance.

Analysis of extensive clinical data reveals that resistance to one antibiotic can coincide with increased sensitivity to another, a phenomenon known as collateral sensitivity. This effect is observed across multiple bacterial species and suggests that strategic combinations or sequencing of antibiotics could help slow the development of resistance, offering new avenues for treatment optimization.
By switching wisely between antibiotics or combining them, you can use this biological effect—known as collateral sensitivity—to reduce the chance that bacteria become resistant, and prevent treatments from failing.

Sebastian T Tandar et al, Clinical prevalence of collateral sensitivity: a systematic exploration of multicentre antimicrobial surveillance data, The Lancet Microbe (2026). DOI: 10.1016/j.lanmic.2025.101274

Comment by Dr. Krishna Kumari Challa 9 hours ago

Cancer has a unique nuclear metabolic fingerprint: New discovery

More than 200 metabolic enzymes, many of which are normally tasked with producing energy in the mitochondria, are also found sitting directly on top of human DNA, according to a study published in Nature Communications. The research shows that different cell types, tissues and even cancers each have a unique pattern of metabolic enzymes compartmentalized inside the nucleus and interacting with DNA. It's the first evidence of human cells having what the authors of the study call a "nuclear metabolic fingerprint."

Though further work needs to be done to clarify whether the enzymes are catalyzing reactions, turning genes on or off or simply providing structural support, the research provides new clues for how different types of tumors grow, adapt or resist treatment.

Many of these enzymes synthesize essential building blocks of life, and their nuclear localization is associated with DNA repair. Their presence in the nucleus may therefore directly shape how cancer cells respond to genotoxic stress, a hallmark of many chemotherapeutic treatments. It's an entirely new world to explore, say the researchers of this new work.

The absence, presence and abundance of the enzymes differed by cancer type. For example, oxidative phosphorylation enzymes were common in breast cancer cells but largely absent in lung cancer cells. When they examined tumor samples from patients, the authors of the study saw a similar pattern, demonstrating the tissue and disease-specific nature of nuclear metabolism.

Scientists have been treating metabolism and genome regulation as two separate universes till now, but  this work suggests they're talking to each other, and cancer cells might be exploiting these conversations to survive.

The researchers carried out experiments to figure out what some of the metabolic enzymes are doing. They studied one group of enzymes which provide building blocks for DNA synthesis and repair and found they gather around chromatin when DNA is damaged, helping repair the genome.

During these experiments they discovered that location matters. The enzyme IMPDH2 showed completely different behavior depending on where it was. When the researchers forced it to stay only in the nucleus, it helped maintain genome stability, but when confined to the cytoplasm, it affected other pathways instead.

The discovery raises new questions about how cancer treatments work. Some drugs target a cancer's metabolic activity, while others target its DNA repair mechanisms. If the two systems are more closely linked than previously thought, it has important implications for cancer research.

It could help explain why tumors of different origins, even when carrying the same mutations, often respond very differently to chemotherapy, radiotherapy, or targeted inhibitors.

According to the authors of the study, their research is the first global evidence that the nucleus is crowded with metabolic enzymes. In the long run, mapping the location and function of the enzymes could help identify new biomarkers for diagnosis or new vulnerabilities that anti-cancer drugs could exploit.

Nature Communications (2026). DOI: 10.1038/s41467-026-69217-2

Comment by Dr. Krishna Kumari Challa 9 hours ago

Toxic evolution: wasps and frogs mimic pain molecules to deter predators

Certain species of wasps and frogs share a pain and inflammation peptide similar to one found in vertebrates to help defend against predators—a discovery that contributes to a shifting view of how evolution works, say researchers.

Wasps and frogs independently evolved bradykinin-like peptides, structurally similar to vertebrate bradykinin, as a defense against predators. These peptides originate from toxin gene families, not from the vertebrate kininogen gene, and effectively trigger pain in predators. The findings highlight convergent evolution as a significant and predictable evolutionary process.
In vertebrates, bradykinin plays a role in wound healing and pain signaling. The research demonstrated the bradykinin‑like peptides in wasps and frogs are derived from toxin gene families, not from the vertebrate kininogen gene that produces bradykinin.

Each lineage across multiple wasp and frog families evolved these molecules separately, often multiple times, to deter predators.

Naiqi Shi et al, Repeated convergent evolution of bradykinin mimics as defensive toxins, Science (2026). DOI: 10.1126/science.adx0452

Comment by Dr. Krishna Kumari Challa 9 hours ago

Tracking the toxic metals left behind by wildfires

Wildfire heat can convert benign chromium-3 in soil to toxic chromium-6 at around 600oC, but this reverts to the safer form at higher temperatures typical of wildfires (800–1200oC). Iron in soil influences these transformations, suggesting post-fire monitoring of iron content could help assess chromium toxicity risks efficiently.

Alireza Namayandeh et al, Nonlinear Redox Transformations of Chromium in Soil during Wildfire Heating: The Critical Role of Iron Mineralogy, Environmental Science & Technology (2025). DOI: 10.1021/acs.est.5c10407

Comment by Dr. Krishna Kumari Challa yesterday

A Universal Vaccine That Blocks Multiple Viruses
Imagine if each year, a simple spray of medicine up the nose could protect you from respiratory viruses, the common cold, bacterial pneumonia, and even spring allergies.

That would transform medical practice.
Researchers are now inching closer to that possibility.
Scientists from institutions across the US have now developed a strikingly "universal" vaccine, which has protected mice against a range of viruses, bacteria, and even allergies.
The new GLA-3M-052-LS+OVA vaccine can be delivered as a nasal spray. Three doses protected mice from infection from SARS-CoV-2 and other coronaviruses for three months, and reduced the viral load in their lungs 700-fold, compared to unvaccinated mice.

The vaccine also accelerated the mice's immune response to SARS-CoV-2. While their lungs' adaptive immune systems typically take up to two weeks to respond to the virus, those with the vaccine took as little as three days to launch a counter-attack.
In follow-up tests, the vaccine was also found to protect the animals against bacterial infections. That included Staphylococcus aureus and Acinetobacter baumannii, both of which are often acquired in hospital settings and are becoming increasingly resistant to antibiotics.
Most surprisingly, the vaccine also cut the risk of asthma. When vaccinated mice were exposed to dust mites, their asthmatic responses, such as increased immune cell production and excess lung mucus, were reduced for three months as well.
In mice, a ‘universal’ vaccine can now protect against a host of viruses, bacteria, and allergies. It can even cut the risk of allergy-induced asthma.

Unlike other available vaccines, this new spray doesn’t require a jab, and it works using a unique mechanism.

The next step is to test the nasal spray in human clinical trials to ensure it is both safe and effective for our species.
Most vaccines work by presenting the immune system with a harmless fragment of a pathogen, allowing the body to prepare an arsenal of targeted antibodies to fight off the real thing if it ever appears. This is working on what's known as adaptive immunity.
This new vaccine works on a different mechanism. Rather than target the pathogen itself, it focuses on the body's response. Essentially, it's designed to link the two main arms of the immune system: The long-lasting but specific adaptive immunity that most vaccines work on, and the short-lived but diverse innate immunity.

The latter is our first line of defense against unfamiliar threats, but it generally wanes after a few days as the adaptive immune system learns to fight off the pathogen.

https://www.science.org/doi/10.1126/science.aea1260

Comment by Dr. Krishna Kumari Challa yesterday

Tundra tongue: The science behind a very cold mistake

Licking frozen metal rarely causes serious harm, but forcibly pulling the tongue away can result in tissue damage, especially at temperatures between -5 and -15 °C. Laboratory tests using pig tongues showed tearing in 54% of cases when pulled. Most real-world incidents are mild, though 18% required medical attention. Warming the metal is the safest way to detach the tongue.
The short answer is that most of the time, licking a piece of frozen metal is probably not going to result in serious harm.

Boys are boys. They do all strange things. Licking frozen metal is one of them!

You'll want to warm the metal where the tongue is stuck to loosen it, maybe by breathing on the metal or using a little warm water.

Whatever you do, however, do not yank the tongue off, say experts. Don't pull your tongue off too fast.
But fully 18% of the cases researchers found resulted in visits to a doctor or hospital to deal with problems like avulsion. That's the clinical way to describe a piece of your tongue getting torn off, such as when yanking it off a frozen piece of metal.
In fact, in 54% of the experiments the researchers conducted, parts of the tongue were torn. The harder they pulled, the greater the likelihood that a piece of the tongue would get torn off.

The greatest risk of having a piece of your tongue torn off, their experiments showed, was when temperatures were between -5 and -15 °C.
They don't know exactly why, but they think it's because the tongue freezes hard enough so it can resist being torn when yanked free from the icy grip of frozen metal.
What to do when tongue meets frozen metal
Do not yank the tongue off rapidly. This makes it most likely that a piece of the tongue will be torn or removed.
To loosen the tongue, warm the metal where the tongue is stuck, perhaps by breathing on the metal or using a little warm water.
In lab tests using pig tongues, pulling them caused tearing 54% of the time—and the harder the pull, the more likely a piece tore off.
However, in a search of almost 250 years of Scandinavian newspaper reports about tongues freezing to metal, only about 18% mentioned a visit to a doctor or hospital.

Anders Hagen Jarmund et al, Demography and outcomes of frozen tongue: a scoping review of Scandinavian tundra tongue cases, International Journal of Pediatric Otorhinolaryngology (2026). DOI: 10.1016/j.ijporl.2026.112740

Anders Hagen Jarmund et al, The trauma of the tundra tongue: an experimental and computational study of lingual tissue damage following adhesion to a cold metal lamp post, Head & Face Medicine (2026). DOI: 10.1186/s13005-025-00581-y

Comment by Dr. Krishna Kumari Challa yesterday

Natural dye produced by Amazonian fungus can be used in cosmetics

Initial tests with a natural dye produced by the Amazonian fungus Talaromyces amestolkiae show that eco-friendly cosmetics, such as face creams, gel sticks, and shampoos, can be developed with antioxidant and antibacterial properties. This finding is significant because microbial dyes, which are still underexplored in cosmetic research, can serve as a sustainable alternative to synthetic dyes.

Juliana Barone Teixeira et al, Redefining Red: Microbial Polyketides in Eco-Friendly Cosmetic Development, ACS Omega (2025). DOI: 10.1021/acsomega.5c10255

Comment by Dr. Krishna Kumari Challa yesterday

Scientists create a hexagonal diamond that could be even harder than the real thing

Cubic diamond is the hardest mineral on Earth and is used in everything from precision cutting tools to high-performance semiconductors as well as expensive jewelry. But there is a rare and potentially tougher form called hexagonal diamond (HD), which has long been the subject of theories and debate over its actual existence. But now researchers  claim to have created this elusive form of carbon in the lab.

Hexagonal diamond (also known as lonsdaleite) is usually found at sites of meteorite impacts. But because the quantities are so small and mixed with minerals, some scientists doubted it was a distinct material. In a paper published in the journal Nature, researchers describe how they made a bulk piece of pure HD using extreme pressure and heat.

Their starting material was highly oriented graphite, which is a highly ordered form of graphite similar to the carbon found in pencils. They placed it between anvils made of tungsten carbide and applied 20 gigapascals of pressure (around 200,000 times the pressure of our atmosphere) at temperatures between 1,300–1,900 °C. The material was squeezed along its c-axis, which means the pressure came from the top of the stacked carbon layers, not the sides. The result, the team says, was a millimeter-sized piece of pure HD.

To confirm that they really had synthesized HD, the team used X-ray diffraction. This technique bounces X-rays off atoms to map their positions and proved the sample was structurally pure. They also used atomic-resolution electron microscopy to clearly see the unique hexagonal stacking patterns of the carbon atoms.

The scientists also tested the mechanical properties of their HD with the Vickers hardness test. They pressed a diamond tip into the sample to assess how much it resisted scratching or denting. This showed that it had a hardness of around 114 gigapascals. Many natural diamonds are typically 110 gigapascals, meaning the team may have created a substance slightly harder than natural diamonds.

"These findings resolve the long-standing controversy on the existence of HD as a discrete carbon phase and provide new insight into the graphite-to-diamond phase transition, paving the way for future research and practical use of HD in advanced technological applications," commented the study authors in their paper.

Shoulong Lai et al, Bulk hexagonal diamond, Nature (2026). DOI: 10.1038/s41586-026-10212-4

Comment by Dr. Krishna Kumari Challa on Thursday

Chemists shed light on how age-related cataracts may begin
A specific oxidative modification in the γS-crystallin protein of the eye lens increases its tendency to aggregate under stress, even though the protein remains structurally stable. This subtle chemical change, which accumulates with age and environmental exposure, may initiate cataract formation by promoting protein clumping and impairing lens transparency.
The research, published in Biophysical Reports, focuses on proteins called crystallins, which help keep the eye lens clear. These proteins are meant to last a lifetime. But unlike most cells in the body, the lens cannot replace damaged proteins, so chemical changes can gradually accumulate over decades.
The protein can still look mostly normal, but even a small chemical change makes it much more likely to stick to other proteins.

Yeonseong Seo et al, Mimicking oxidative damage in γS-crystallin with site-specific incorporation of 5-hydroxytryptophan, Biophysical Reports (2026). DOI: 10.1016/j.bpr.2026.100251

Comment by Dr. Krishna Kumari Challa on Thursday

Pollution, noise and climate stress all pose a serious threat to heart health
Environmental stressors such as air pollution, noise, chemical exposure, and climate-related factors significantly increase cardiovascular disease (CVD) risk, contributing to over 13 million deaths annually. These factors interact through shared biological pathways and disproportionately affect vulnerable populations. Integrating environmental risks into CVD prevention is essential for effective public health strategies.
For decades, cardiologists have developed treatments and prevention measures that focus solely on the individual: controlling blood pressure, lowering cholesterol, quitting smoking, and so on. Environment is also a key determinant of CVD risk, but it has been persistently overlooked. Environmental risk factors are estimated to contribute to more than 13 million deaths annually, exceeding the burden of many well-established risk factors.
According to the World Health Organization, 99% of the world's population breathes air that exceeds its recommended pollution levels. But air pollution is not the only risk factor—chronic exposure to noise, nighttime light pollution, chemical pollutants, poor water and soil quality, and the increasingly frequent impacts of climate change such as heat waves and fires all play a fundamental role in heart health.
The combined impacts of environmental factors accumulate over the years, affecting our overall cardiovascular health. The joint article by the cardiology societies emphasizes that these factors do not act in isolation—they interact through shared biological pathways such as inflammation and oxidative stress.
Reducing pollution, noise and urban heat is therefore not just a matter of ecology—it literally prevents heart disease.

https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.125.079034

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