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Comment by Dr. Krishna Kumari Challa on May 17, 2026 at 11:49am

Loss of the X chromosome is associated with reduced chance of natural pregnancy

Chromosomes carry genetic information for biological sex, which generally assigns women two X chromosomes and men XY chromosomes. This is a basic principle of human genetics most are taught in grade school biology, but it is little known that with aging, men can lose the Y chromosome, and women can lose one of their X chromosomes.

These phenomena are known as loss of the Y chromosome (LOY) and loss of the X chromosome (LOX). LOY is associated with several diseases such as Alzheimer's disease, diabetes mellitus, and heart disease, while LOX may be linked to acute myeloid leukemia and pneumonia.
Loss of the X chromosome (LOX) in white blood cells is more prevalent in women with infertility, and a LOX cell proportion above approximately 0.9% is associated with reduced likelihood of natural pregnancy. LOX levels were not correlated with anti-Müllerian hormone (AMH), suggesting that combining LOX and AMH assessments may improve prediction of natural pregnancy potential.
The results revealed that women with infertility had a significantly higher proportion of LOX cells. Furthermore, when the proportion of LOX cells in white blood cells exceeded approximately 0.9%, the likelihood of achieving natural pregnancy decreased.
In the future, measuring LOX in individuals experiencing infertility may help determine whether natural pregnancy is possible or whether fertility treatments, such as in vitro fertilization, should be initiated at an earlier stage.

Taiki Kikuchi et al, Haematopoietic loss of the X chromosome is associated with a lower likelihood of natural conception, Reproductive BioMedicine Online (2026). DOI: 10.1016/j.rbmo.2026.105638

Comment by Dr. Krishna Kumari Challa on May 17, 2026 at 11:38am

Losing grip on reality while using ChatGPT
Prolonged, intensive interactions with AI chatbots such as ChatGPT have been associated with the emergence of AI-induced delusions or psychosis, characterized by loss of reality, social isolation, and significant personal and psychological harm. These effects appear to be exacerbated by chatbot behaviors such as excessive flattery and emotional engagement, raising concerns about mental health risks and the need for regulatory oversight.
An unknown number of people have lost their grip on reality while communicating with chatbots, an experience tentatively being called AI-induced delusion or psychosis.
This is not a clinical diagnosis. Researchers and mental health specialists are racing to catch up to this new, little-understood phenomenon, which so far appears to particularly affect users of OpenAI's ChatGPT.

In the meantime, an online community set up by a 26-year-old Canadian has become the world's most prominent support group for these delusions, which they prefer to call "spiraling."
Questions are also being asked about whether AI companies are doing enough to protect vulnerable people.
People are literally getting brainwashed by a robot!

RESEARCH REPORTS

Comment by Dr. Krishna Kumari Challa on May 17, 2026 at 10:02am

Natural malaria immunity:  The secret to why some people never get sick

People living in regions where malaria outbreaks are common experience repeated exposure to the disease, which gradually teaches the body how to fight back. Over time, they develop naturally acquired immunity that helps the body control the density of malaria parasites (Plasmodium falciparum) in the blood and prevent the development of clinical symptoms.

A recent study set out to pinpoint the specific parts of the malaria parasite that the immune system targets to protect the body from disease. The researchers deliberately infected 142 Kenyan adults known to be immune to malaria, then monitored their symptoms and parasite levels. They successfully identified six merozoite antigens—proteins on the surface of the malaria parasite—that were linked to natural immunity against the disease. The findings were published in Nature Communications.

 Six key proteins linked to protection: MSP1, MSP11, RAMA, MSP7, PHISTB, and PTEX150.

The team found that immunity was strongest when the body produced antibodies against more than one protein, as combinations of antibodies worked more effectively. They also observed that individuals with high levels of antibodies against four of the six proteins were the ones who showed complete protection from developing malaria symptoms during the study.

For vaccine researchers, these findings can open up promising new directions in the fight against malaria. More effective vaccines could ultimately save millions of lives, particularly among children in Africa, where the disease continues to wreak havoc every year.

Rodney Ogwang et al, Controlled human malaria infection in adults identify combinations of merozoite antigens associated with clinical immunity, Nature Communications (2026). DOI: 10.1038/s41467-026-72716-x

Comment by Dr. Krishna Kumari Challa on May 17, 2026 at 9:50am

Rivalry with neighboring groups may be a key driver of male size in primates

In many primate species, males are much larger than their female counterparts, which is generally attributed to male competition for mates (sexual selection). But bigger bodies may not just be about alpha males defeating rivals. They could also come about because of competition between neighbouring social groups, according to a new study published in the journal Biology Letters.

The authors thought that the standard scientific view that a primate male's size was mostly determined by rivalry within the same group was not the full story. They wanted to see if the threat from outsiders was an even more powerful evolutionary engine. One of the reasons for this was that primate groups are not isolated. They tend to live close to other groups, meaning they must share or fight for resources.

The team searched through scientific literature and collected data on 146 different primate species. They compared male and female size against several measures of between-group competition. These included the daily encounter rate, the proportion of encounters that were antagonistic, and the home range overlap (the percentage of a group's total range that is shared with a neighbouring group).

It turns out that the mating system, which describes how males and females pair up for breeding, was not a strong predictor of size differences. Instead, it was pressure for space. The authors discovered that the more a group's territory overlaps with its neighbours, the larger the males are compared to the females. Frequent encounters with neighbouring groups also appear to promote the evolution of larger male bodies.

Their hypothesis is that the evolutionary advantage and driver of size is that it acts as a silent deterrent. Being larger helps a male defend resources and guard mates by simply being intimidating. This reduces the need for risky physical fights. Over time, evolution favors these larger males because they can successfully protect their group and territory by their physical presence alone.

"Home range overlap may select for larger males to deter rivals, defend resources or monopolize females across shared territories, potentially without frequent physical contests," wrote the research team in their paper.

Cyril C. Grueter et al, Effects of between-group competition on sexual size dimorphism in primates, Biology Letters (2026). DOI: 10.1098/rsbl.2025.0680

Comment by Dr. Krishna Kumari Challa on May 17, 2026 at 9:25am

As part of their study, researchers studied mice that had previously formed associations between neutral stimuli (e.g., a sound) and adverse experiences (i.e., a small electric shock). They looked at cells in the mice's brains as they were undergoing fear extinction, or in other words, while they were repeatedly exposed to the stimuli they had learned to associate with danger, but in the absence of any adverse stimuli.

To do this, they first used activity-dependent tagging techniques to label neurons in the brain of mice that store specific fear memories. These fearful memory-encoding neurons are known as engrams.

They then examined what happened during extinction learning and found that microglia preferentially interacted with these neurons. Next, they disrupted these interactions using genetic and pharmacological approaches. Across experiments, interfering with microglia-engram interactions slowed extinction learning, indicating that microglia actively help regulate the weakening of fear memories.
The team's observations suggest that microglia contribute to the extinction of fear memories in mice and in the weakening of associated fearful responses. Specifically, the researchers found that interactions between microglia and neurons temporarily reduced the activity of fear engram neurons.

When they prevented these interactions from taking place, the fear extinction process appeared to slow down considerably. This suggests that microglia play a significant role in the weakening of fear responses and are in fact active regulators of fear extinction.

The most important finding is that extinction is not solely a neuronal process.
The results of this recent study could soon help to refine existing models of fear extinction. In addition, they could pave the way for new research that specifically explores the role of microglia in the recovery from PTSD and anxiety disorders.

Yunlong Liu et al, Microglia-dependent regulation of fear memory extinction, Nature Neuroscience (2026). DOI: 10.1038/s41593-026-02286-0.

Comment by Dr. Krishna Kumari Challa on May 17, 2026 at 9:05am

Fear memories fade faster when brain immune cells engage key neurons

Post-traumatic stress disorder (PTSD) and anxiety disorders are often characterized by fearful responses in specific situations that the mind learns to view as threatening. These fearful responses typically emerge following traumatic events or challenging life experiences, which prompt the brain to form unhelpful associations between specific stimuli and distressing events.

The fearful responses associated with PTSD or anxiety disorders can gradually diminish via a process known as fear extinction. This process entails the repeated exposure to a situation or stimulus perceived as threatening, but without any danger arising.

Understanding the neurobiological processes that support fear extinction could be very valuable, as it could help to devise new therapeutic strategies for treating symptoms of PTSD and anxiety disorders. 

Researchers have been trying to fill the gap in the literature by looking at how microglia in the mouse brain influence fear extinction. Their findings, published in Nature Neuroscience, suggest that microglia take part in the weakening of fearful memories over time via interactions with neurons.

Part 1

Comment by Dr. Krishna Kumari Challa on May 16, 2026 at 11:55am

The rising number of parents refusing the intervention has added a new layer of complexity to diagnosing sick infants in the ED, where the most common cause of bleeding is trauma, such as a fall.

When evaluating infants who did not receive vitamin K injections, "clinicians may need to consider serious bleeding complications when evaluating otherwise nonspecific symptoms such as lethargy, vomiting, seizures, or pauses in breathing."
Parents refuse the shot for a wide range of reasons. One 2019 qualitative study found the refusal was often driven by a broad aversion to anything perceived as foreign or interventional at birth.

Increasingly, refusals are driven by misinformation circulating on social media that often conflates the shot with vaccines simply because it is an injection administered at birth. "But it's not a vaccine—it's a vitamin supplement."
Oral vitamin K—sometimes offered if parents turn down the injection—is not a reliable alternative because absorption through a newborn's gut is inconsistent, and repeat dosing would be required throughout the newborn period, says Howard.

Other reasons parents object to the birth dose:

Fear of side effects: Parents have encountered unfounded claims online about dangerous complications. In reality, decades of use support the shot's safety profile.
The cancer myth: A small study from the 1980s suggested a possible link between the shot and childhood cancer, but subsequent larger, more rigorous studies have not confirmed that association. "We have strong evidence to support that it does not increase an individual's cancer risk," Howard says.
"Breast milk is enough": Some parents mistakenly believe breastfeeding provides sufficient vitamin K—but it does not, says Thorne-Lyman. Unlike vitamin D, which can be meaningfully enriched in breast milk if the mother is sufficiently supplemented, "even if the woman is eating a good diet that's rich in vitamin K sources, there is still a possibility that their child is going to be deficient," he explains. Formula-fed infants may have a somewhat lower risk because formula contains added vitamin K, but the injection is still recommended for all newborns.
Delayed cord clamping: Some families believe that leaving the umbilical cord attached longer will transfer enough vitamin K from the placenta. "Placental transfer of vitamin K is very low, including through the cord blood, so delayed cord clamping does not provide sufficient vitamin K to prevent VKDB," Howard says.
A broader dynamic is also at play: Because VKDB became so rare after the shot was introduced, many parents have no frame of reference for how serious it can be. Because the underlying disease has become invisible, it produces a level of complacency.
Parents, unfortunately, are turning to social media rather than being able to sit down with their pediatrician.
We know now from decades of evidence and use that it is safe, effective, and necessary to prevent vitamin K deficiency bleeding, which can have deadly, or if not deadly, lifelong consequences for an infant.

https://hub.jhu.edu/2026/05/15/what-parents-need-to-know-newborn-vi....

Comment by Dr. Krishna Kumari Challa on May 16, 2026 at 11:51am

The newborn vitamin K shot: What every parent needs to know

The vitamin K shot is one of the oldest, safest, and most effective preventive interventions in newborn medicine.
The American Academy of Pediatrics—which first endorsed the intervention in 1961—recommends the shot be administered within six hours of birth. But amid a flood of misinformation online, more parents are refusing the shot for their newborns, sometimes with devastating consequences—highlighting the need for better communication about its benefits and the risks of forgoing it.
A single intramuscular vitamin K injection at birth effectively prevents vitamin K deficiency bleeding (VKDB), a potentially fatal condition in newborns who have naturally low vitamin K levels. Without the injection, the risk of VKDB increases up to 81-fold, with consequences including irreversible brain damage or death. Oral alternatives are unreliable, and breast milk does not provide sufficient vitamin K. The injection is safe, with no proven link to cancer or serious side effects.
No parent wants their child to bleed to death. No parent wants their child to have hemorrhaging in their brain.
Vitamin K is essential for blood clotting, but newborns are born with very low levels of the nutrient, making them vulnerable to vitamin K deficiency bleeding, or VKDB—a condition that can cause internal bleeding in the brain, intestines, and other vital organs.

The single vitamin K injection—typically 0.5 mg to 1.0 mg given just after birth— prevents VKDB during the critical first months of life while the baby is building up their own vitamin K stores and before they start eating solid foods around 4–6 months old.

Without the vitamin K shot, the risk of bleeding is up to 81 times higher, with incidents occurring in 1 in 14,000 to 25,000 babies.

While most adults naturally maintain healthy vitamin K levels produced by bacteria in the gut and a balanced diet, the nutrient "does not cross the placenta easily."
Breast milk does not provide sufficient amounts after the birth.
The consequences of VKDB can be swift and devastating—and there's no reliable way to measure a baby's risk.
And the only sign that something is wrong is sudden, catastrophic bleeding, when the bleeding is already severe and difficult to reverse.
Brain bleeds are among the most serious outcomes. Depending on where blood accumulates and how quickly it is detected, consequences range from neurological impairment to death. "If [the hemorrhage] is pushing against the brainstem, which regulates a baby's breathing and heart rate, and it's not detected quickly enough, that has devastating consequences.
After bleeding begins, treatment options are limited. Vitamin K can be administered as a last resort to help stop active bleeding, but damage already done to the brain may be permanent.
Part 1

Comment by Dr. Krishna Kumari Challa on May 16, 2026 at 11:36am

Soil also suffers from heat waves: Organic waste boosts its tolerance to 50°C

Adaptability has its limits.

When the temperature exceeds 40 degrees, just as human health suffers, the microorganisms that inhabit the soil—and from there provide a multitude of ecosystem services, such as carbon sequestration and plant nutrition—concentrate more on survival than continuing their work.
A study conducted by researchers has determined the temperature limit that soil in various regions can reach before it begins to degrade. The study also provides insights into what we can do to help the soil.

Soil microbial activity and phosphorus availability decline sharply above 40°C, with near-total functional shutdown at 50°C, threatening soil health under recurrent heat waves. Incorporating organic amendments, particularly olive pomace, significantly enhances soil resistance and phosphorus retention at high temperatures, supporting soil resilience and ecosystem services amid climate change.

Above 40 degrees, microorganisms' ability to capture carbon diminishes, and it practically "shuts down" at 50 degrees.
The higher the temperature they endure, the lower the soil's phosphorus reserve becomes, which is virtually non-existent when exposed to temperatures above 40 degrees.
To address this issue, the research team has explored ways to mitigate the damage caused by high temperatures, which they aim to counteract through the use of organic additives that enhance soil resistance.

Sana Boubehziz et al, Soil Preservation in Warming Climate: Organic Amendments Enhance Microbial Carbon Use Efficiency in Mediterranean Soils, European Journal of Soil Science (2026). DOI: 10.1111/ejss.70323

Comment by Dr. Krishna Kumari Challa on May 16, 2026 at 11:22am

Keeping bacteria contained with a stiffer, tougher scaffold
The researchers involved in the new study identified two main aspects of existing hydrogel scaffolds that needed improvement. They wrote, "We hypothesized that fulfilling two key criteria for a material enables robust and durable containment of therapeutic bacteria: (i) resistance to the internal forces generated by proliferating bacteria and (ii) mechanical toughness sufficient to withstand deformation from surrounding tissues."

And so, the team engineered an implantable polyvinyl alcohol (PVA) hydrogel with optimized stiffness and toughness to keep expanding colonies from breaking through and to resist breakage under body movement. They then embedded engineered E. coli bacteria in protective microgels within it.

The team then tested out the new scaffold in various situations. They allowed the encapsulated bacteria to sit in a nutrient broth in the lab for six months, checking in on it frequently to see if any bacteria leaked out. But the scaffold held the bacteria for the entire six-month period.

They also evaluated fatigue resistance using cyclic crack growth testing, which tests how fast a flaw grows in a material under repeated loading. The PVA material showed a high fatigue threshold that indicated a 10-fold improvement over previous agarose-based materials. The new scaffold material also outperformed agarose in mechanical robustness testing and showed that the bacteria remained inside and functional under stress.
The new ILM material was then tested out as a local drug depot in a mouse model. The mice were implanted with a pin containing the ILM and then infected with a bacteria called Pseudomonas aeruginosa, which is common in implant surgeries and known for having an inherent resistance to many common classes of antibiotics. The bacteria in the scaffold were engineered to detect P. aeruginosa and release a drug to treat the infection.

The mice implanted with the new ILM material and engineered bacteria showed significantly reduced infection, compared to controls. Engineered bacteria inside the ILM were able to successfully detect infection signals and release the antimicrobial proteins to treat the infections in mice.

The team also performed testing on cancer cells in the lab, which showed successful drug delivery using the new materials. They write, "To evaluate platform versatility beyond antimicrobial therapy, we tested ILMs in a cancer-relevant context. Conditioned media from ILMs encapsulating Escherichia coli ClearColi (Ecc) engineered to express an inducible pore-forming toxin significantly reduced viability of CT26 cancer cells compared with GFP controls."

These results represent a big step in safer microbe-based drug delivery, although long-term safety and immune responses in humans still need to be studied. Further studies will also be helpful for determining potential effects or efficacy of chronic use and broader disease applications.

Tetsuhiro Harimoto et al, Implantable living materials autonomously deliver therapeutics using contained engineered bacteria, Science (2026). DOI: 10.1126/science.aec2071

Part 2

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