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Comment by Dr. Krishna Kumari Challa 12 hours ago

Wild animals can now GPS-collar themselves for research

For six decades, wildlife researchers have faced a persistent challenge: to attach a tracking device to study a wild animal, they first have to catch it. Now, a new approach allows GPS collars to be deployed autonomously on free-roaming terrestrial wildlife. Published in BioScience, the proof-of-concept study demonstrates Capture-Free Telemetry (CFT), a technique that places tracking devices on wild animals as they interact with baited deployment units in their natural habitat.
Capture-Free Telemetry uses species-specific autonomous deployment setups that allow wild animals to collar themselves when interacting with baited devices in their habitat. In trials conducted in Norway, Bischof demonstrated proof-of-concept systems tailored to both ungulates (red deer, Cervus elaphus) and carnivores (red foxes, Vulpes vulpes). The field trials involving deer were conducted at the Norwegian Deer Centre (Norsk hjortesenter), a national competence center for deer and other wild ungulates in Norway.

To safeguard animal welfare, safety features are built directly into the design. The collars automatically adjust to the animal's neck size. They are also designed to drop off after a few weeks or a couple of months and have built-in weak spots to allow separation in case of discomfort or entanglement.

Rethinking wildlife telemetry: capture-free instrumentation for ethics, scale, and inference, BioScience (2026). DOI: 10.1093/biosci/biag154

Comment by Dr. Krishna Kumari Challa 12 hours ago

When they analyzed the recordings they collected, the researchers found that individual neurons in the mice's hippocampus responded in different and changing ways. Nonetheless, separable patterns within their collective activity appeared to represent the location where an experience unfolded, the progression of time and the choices made by the animals.

The temporal and contextual components of these representations are governed by local inhibitory interactions and input-driven cell–assembly dynamics, respectively.
These findings reveal the circuit basis of disentangled hippocampal representations, offering a unifying geometric principle of population coding that supports flexible memory representations and enables rapid generalization of prior knowledge to new situations.
The results of this study suggest that the mouse hippocampus encodes different aspects of experiences via distinct patterns of neuronal activity. These patterns could ultimately help mice to tell different experiences apart, while also applying what they learned in the past in new situations.

Wenbo Tang et al., Circuit mechanisms for disentangled representations and generalization in the hippocampus, Nature Neuroscience (2026). DOI: 10.1038/s41593-026-02491-x

Part 2

Comment by Dr. Krishna Kumari Challa 12 hours ago

Neurons in the hippocampus separate different aspects of experiences

When remembering an experience, people often recall not just where it happened, but also its timing and how it unfolded over time. This helps them to recall sequences of events and associations that can guide their actions in new scenarios.
Memories of events, their timing and the order they occurred in are known to be encoded by the hippocampus. This is a structure located deep inside the brain that plays a key role in memory, the regulation of emotions and spatial navigation.

Past research showed that some neurons in the hippocampus, called place cells, become active when people are in specific locations. These neurons can also respond to other features of an event or experience.

Researchers recently studied the activity of neurons in the hippocampus of mice as they were completing various tasks. Their observations, presented in a paper published in Nature Neuroscience, suggest that different aspects of experience are represented by distinguishable patterns in the collective activity of hippocampal neurons.
To understand how neurons in the hippocampus encode experiences, the researchers carried out experiments with mice. The mice were trained to complete memory tasks in different mazes, including a task that required them to remember the route they previously took (left or right) and select the path heading the opposite direction during the following experimental trial.
While the mice were navigating mazes, the team recorded the activity of neurons in their hippocampus using tiny probes that were implanted in their brains. These probes contain many electrodes that can record the electrical signals associated with the activity of individual neurons.
In the hippocampus, neurons are tuned to spatial location, yet their activity is also modulated by multiple external and internal variables and appears to drift randomly over time, making it difficult to link hippocampal computations to behaviour.
By analyzing hippocampal population dynamics in behaving mice, they revealed a structured organization underlying the diversity of single-neuron responses—the hippocampus encodes different aspects of experience as disentangled variables represented in the co-activity dynamics of cell assemblies.

Part 1

Comment by Dr. Krishna Kumari Challa yesterday

Engineered probiotic senses inflammation and helps repair the gut in mice

Inflammatory bowel disease damages the lining that separates the gut's contents from the rest of the body. Calming the inflammation is only part of the treatment challenge, however—that protective barrier also needs to heal.
Researchers have engineered a probiotic bacterium that uses the chemical signs of inflammation to switch on production of a protein that encourages intestinal repair. Given orally to mice with chemically induced colitis, the bacteria both reduced tissue damage and promoted recovery of the gut lining.
The researchers describe their approach in the journal Cell Reports. Their experiments connect two promising treatment pathways of detecting an inflamed gut and delivering a repair signal in response.

Yu Zhao et al., An engineered probiotic for diagnosis and mucosal healing in inflammatory bowel disease, Cell Reports (2026). DOI: 10.1016/j.celrep.2026.118171

Comment by Dr. Krishna Kumari Challa yesterday

Now I can proudly say, I did my PhD before the technology arrived. My PhD is genuine !

Comment by Dr. Krishna Kumari Challa on Tuesday

Scientists build whole-Earth simulation to help find life on other planets

A whole-Earth model simulated 5 billion years of chemical exchange among the core, mantle, crust, surface and atmosphere without life, reproducing 19 planetary properties. Adaptable to rocky exoplanets, it provides a baseline for assessing whether observed atmospheres can arise without biological activity.

Samantha Gilbert-Janizek et al., A Whole-planet Model of the Earth without Life for Terrestrial Exoplanet Studies, The Planetary Science Journal (2026). DOI: 10.3847/psj/ae9d79

Comment by Dr. Krishna Kumari Challa on Tuesday

Collective human metabolism produces 2 billion metric tons of CO₂ a year, global study estimates

A new study has estimated that the carbon dioxide produced by humans as our bodies turn food into energy rose by 74% between 1985 and 2015, reaching 2.05 billion metric tons a year. Researchers say the findings could help scientists better understand where carbon comes from, where it goes and how human activity fits into the bigger picture.
Crucially, the CO₂ people breathe out is not the same as emissions from burning fossil fuels. The carbon we exhale comes from the food we eat and is largely carbon that plants have recently taken from the atmosphere. Fossil fuels, by contrast, release carbon that has been stored underground for millions of years.

The study found that the amount of CO₂ produced by people worldwide rose from 1.18 billion metric tons in 1985 to 2.05 billion metric tons in 2015. Population growth accounted for more than 60% of the increase.
What this study does is give us a much clearer picture of how much CO₂ people produce around the world, and how that is changing as the population grows. This understanding can help improve the accuracy of predictions of carbon reduction programs.

Javier T Gonzalez et al., Accounting for global carbon dioxide production from human metabolism between 1985 and 2015: a modelling study, The Lancet Planetary Health (2026). DOI: 10.1016/j.lanplh.2026.101546

Comment by Dr. Krishna Kumari Challa on Sunday

First patient undergoes pioneering stem-cell treatment for Parkinson's

The first patient received iPS cell-derived dopamine neuron precursors for Parkinson’s disease after conditional approval in Japan. In an earlier seven-patient trial, no major adverse effects occurred over two years, and four patients showed symptom improvement. Full approval requires confirmation of safety and efficacy.

Comment by Dr. Krishna Kumari Challa on October 30, 2026 at 11:25am

Is it a boy or a girl? For alligators, it may come down to one degree

The future of the alligator species could come down to a one- or two-degree temperature difference, according to new research .
A small change on the thermometer could determine whether a gator develops as a male or female. And that could have ramifications for alligator populations as temperatures rise.

Typically, incubations at cooler temperatures (think 86 to 88 degrees Fahrenheit) and hot spells (97 degrees Fahrenheit and above) result in more female gators. Moderate temperatures (90 to 92 degrees Fahrenheit) yield more males.

But these trends largely reflect controlled experiments in laboratories in which alligator eggs are incubated under constant temperatures.

Nests in the wild don't experience constant temperatures; instead, temperatures fluctuate due to heat waves or just going from day to night.

The present study gives scientists a better understanding of real-world nest conditions.
Whenever a population is out of balance, it can impact population growth. Whenever you start to lose females, then the population can really get in trouble.
The researchers' new model closely matched previous sex outcomes at cooler temperatures. But at higher temperatures, even a change of one or two degrees made a big difference in whether alligator embryos developed as male or female.
A small difference can lead to mostly males or mostly females being produced.
That's really relevant for how the environment is going to be changing in the near future. If temperatures are biasing sex ratios, that's a big issue.
The eggs' swap back to a female outcome occurred at a lower temperature threshold than anticipated. Whereas some previous models expected the flip to happen around 97 degrees Fahrenheit, the new model suggests that sex was more likely to be female starting at 93 degrees Fahrenheit. Temperatures between the two female-producing ranges still produce mostly males.

Karin R. Ebey et al., A sex ratio by incubation temperature reaction norm for the American alligator ( Alligator mississippiensis ) based on fluctuating thermal regimes, Journal of Experimental Biology (2026). DOI: 10.1242/jeb.252972

Comment by Dr. Krishna Kumari Challa on October 30, 2026 at 10:42am

Microplastic shape can influence viral disease severity in rainbow trout
Continuous nylon microfiber exposure approximately doubled the odds of death in rainbow trout infected with infectious hematopoietic necrosis virus, while rounded nylon particles did not significantly increase mortality. These laboratory results indicate that microplastic shape can affect viral disease severity; effects in natural environments remain uncertain.

Meredith E Seeley et al., Microplastic fibers can alter viral disease severity, contingent on particle shape and exposure timing, Environmental Toxicology and Chemistry (2026). DOI: 10.1093/etojnl/vgag233

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