Comment

Comment by Dr. Krishna Kumari Challa on March 25, 2021 at 1:57pm

Earth is the only planet known to maintain life. Find out the origins of our home planet and some of the key ingredients that help make this blue speck in space a unique global ecosystem.

Comment by Dr. Krishna Kumari Challa on March 25, 2021 at 1:46pm

Neuroscientists Detect Confused 'Zombie' Cells in The Human Brain After Death

You'd think once a human is dead, the body would be done doing things; without blood circulation and air, the inner systems would be fast depleted. But due to a weird quirk of biology there are such things as the living dead - living cells, at least, within a done and dusted body.

Some cells within human brains actually increase their activity after we die. These 'zombie' cells ramp up their gene expression and valiantly continue trying to do their vital tasks, as if someone forgot to tell them they're now redundant.

Neurologists recently  watched as these cells stubbornly sprouted new tentacles and busied themselves with chores for hours after death.

Most studies assume that everything in the brain stops when the heart stops beating, but this is not so.

While most gene activity remained stable for the 24 hours,  neuronal cells and their gene activity rapidly depleted. Most remarkably though, glial cells increased gene expression and processes after death. 

While surprising at first, this actually makes a lot of sense, given glial cells, such as waste-eating microglia and astrocytes, are called into action when things go wrong. And dying is about as 'wrong' as living things can go.

That glial cells enlarge after death isn't too surprising given that they are inflammatory and their job is to clean things up after brain injuries like oxygen deprivation or stroke. The scientists then demonstrated the RNA expressed by genes doesn't itself change within 24 hours post death, so any changes in its amount must indeed be due to the continuation of biological processes.

After 24 hours, however, these cells also succumbed and were no longer distinguishable from the degrading tissue that surrounded them.

https://www.nature.com/articles/s41598-021-85801-6

https://www.sciencealert.com/confused-zombie-cells-spring-to-action...

Comment by Dr. Krishna Kumari Challa on March 25, 2021 at 1:24pm

https://releases.jhu.edu/2021/03/22/cells-can-walk-a-microscopic-ti....

Comment by Dr. Krishna Kumari Challa on March 25, 2021 at 1:24pm

Cells can walk a microscopic tightrope, researchers discover

By offering cells a microscopic “tightrope,” Johns Hopkins University and Virginia Tech scientists have discovered a new and surprising form of cellular movement.

Normally when cells crawling in an organism come in contact with another one another, they reverse and move randomly away from the other cell. But when nanofiber “tightropes” coated with proteins were suspended in a three-dimensional medium for cells to explore, cells either walked past each other to avoid a collision or formed a train moving together along the length of the nanofiber.

The option of walking the line made the typically erratically moving cells much more systemic and predictable, the team found. This new understanding of cellular movement helps explain why some drugs work differently in tests within petri dishes than they do in humans or animals.

The findings just published in the Proceedings of the National Academy of Sciences.

“A cocktail of mechanical engineering, cell biology, physics, and computational modeling reveals cell behaviors not known before

Comment by Dr. Krishna Kumari Challa on March 25, 2021 at 12:47pm

Corona waste kills animals throughout the entire world

Biologists started a quest to determine how often and where interactions between corona waste and animals occur. They collected observations from Brazil to Malaysia and from social media to local newspapers and international news websites.

A fox in the United Kingdom, birds in Canada, hedgehogs, seagulls, crabs, and bats - it transpired that all sorts of animals, everywhere, become entangled in face masks.

They found reports about apes chewing on face masks, and about a penguin with a face mask in its stomach. Pets too, especially dogs, were found to swallow face masks. Animals become weakened due to becoming entangled or starve due to the plastic in their stomach. The diversity of animals influenced by corona waste is considerable. "Vertebrates and invertebrates on land, in freshwater, and in seawater become entangled or trapped in corona waste.

 animals use the waste as nest material. For example, coots in Dutch canals use face masks and gloves as nest material. And the packaging from paper handkerchiefs is found in nests too. As such, we even see the symptoms of COVID-19 in animal structures.

https://www.covidlitter.com/

https://eurekalert.org/pub_releases/2021-03/nbc-cwk032421.php

Comment by Dr. Krishna Kumari Challa on March 25, 2021 at 11:20am

All meat that has been smoked, salted, cured, dried or canned is considered processed.

Comment by Dr. Krishna Kumari Challa on March 25, 2021 at 6:44am

Why you can't compare Covid-19 vaccines

--
Vaccine side effects are actually a good thing

Comment by Dr. Krishna Kumari Challa on March 24, 2021 at 10:39am

Ten years later, here’s what Fukushima’s damaged reactors look like today

Comment by Dr. Krishna Kumari Challa on March 24, 2021 at 10:30am

Researchers reveal how a cell mixes its mitochondria before it divides

In a landmark study, a team led by researchers at the Perelman School of Medicine at the University of Pennsylvania has discovered and filmed the molecular details of how a cell, just before it divides in two, shuffles important internal components called mitochondria to distribute them evenly to its two daughter cells. The finding, published in Nature, is principally a feat of basic cell biology, but this line of research may one day help scientists understand a host of mitochondrial and cell division-related diseases, from cancer to Alzheimers and Parkinsons.

Mitochondria are tiny oxygen reactors that are crucial for energy production in cells. It was found in the study that a protein called actin, which is known to assemble into filaments that play a variety of structural roles in cells, also has the important task of ensuring an even distribution of mitochondria prior to cell division. Thanks to this system, the two new cells formed by the division will end up with approximately the same mass and quality of these critical energy producers.

Mitochondria, which can number from a handful to tens of thousands per cell, depending on the cell type, are probably especially important to mix evenly. They are critical for the health of a cell, and contain their own small DNA genomes—new mitochondria can’t be produced in a cell except by the splitting of mitochondria inherited from the mother cell.

https://www.pennmedicine.org/news/news-releases/2021/march/penn-med...

https://researchnews.cc/news/5797/Penn-Medicine-researchers-reveal-...

Comment by Dr. Krishna Kumari Challa on March 24, 2021 at 10:19am

Evidence of new physics at CERN? Why we're cautiously optimistic ab...

When CERN's gargantuan accelerator, the Large Hadron Collider (LHC), fired up ten years ago, hopes abounded that new particles would soon be discovered that could help us unravel physics' deepest mysteries. Dark matter, microscopic black holes and hidden dimensions were just some of the possibilities. But aside from the spectacular discovery of the Higgs boson, the project has failed to yield any clues as to what might lie beyond the standard model of particle physics, our current best theory of the micro-cosmos.

• ‹ Previous
• 1
• …
• 612
• 613
• 614
• 615
• 616
• …
• 1042
• Next ›
• Page