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Comment by Dr. Krishna Kumari Challa on March 16, 2021 at 12:02pm

When memory qubits and photons get entangled

Encrypting data in a way that ensures secure communication is an ever-growing challenge because crucial components of today's encryption systems cannot withstand future quantum computers. Researchers around the world are therefore working on technologies for novel encryption methods that are also based on quantum effects. The phenomenon of so-called quantum entanglement plays a particularly important role here. This means that in a quantum network, the stationary qubits of the network are entangled with the communication channel, which usually consists of photons (light particles). For the first time, physicists at the University of Bonn have now been able to demonstrate quantum entanglement between a stationary qubit, i.e. a two-state quantum system, and a photon with direct coupling to an optical fiber. The study has been published in the journal npj Quantum Information.

Pascal Kobel et al. Deterministic spin-photon entanglement from a trapped ion in a fiber Fabry–Perot cavity, npj Quantum Information (2021). DOI: 10.1038/s41534-020-00338-2

Quantum systems originate from the world of particles and smallest structures and may be relevant for future technologies. If different quantum information carriers (quantum nodes) are interconnected by quantum channels, researchers speak of quantum networks. 

https://phys.org/news/2021-03-memory-qubits-photons-entangled.html?...

Comment by Dr. Krishna Kumari Challa on March 16, 2021 at 11:57am

Practical nanozymes discovered to fight antimicrobial resistance

Nanozymes, a group of inorganic catalysis-efficient particles, have been proposed as promising antimicrobials against bacteria. They are efficient in killing bacteria, thanks to their production of reactive oxygen species (ROS).

Despite this advantage, nanozymes are generally toxic to both bacteria and mammalian cells, that is, they are also toxic to our own cells. This is mainly because of the intrinsic inability of ROS to distinguish bacteria from mammalian cells.

In a study published in Nature Communications, the research team proposed a novel method to construct efficient-while-little-toxic nanozymes.

The researchers showed that nanozymes that generate surface-bound ROS selectively kill bacteria, while leaving the mammalian cells safe.

The selectivity is attributed to, on the one hand, the surface-bound nature of ROS generated by the nanozymes prepared by the team, and on the other hand, an unexpected antidote role of endocytosis, a cellular process that is common for mammalian cells while absent in bacteria.

Feng Gao et al. Surface-bound reactive oxygen species generating nanozymes for selective antibacterial action, Nature Communications (2021). DOI: 10.1038/s41467-021-20965-3

https://phys.org/news/2021-03-nanozymes-antimicrobial-resistance.ht...

Comment by Dr. Krishna Kumari Challa on March 16, 2021 at 11:44am

Study finds cancer cells may evade chemotherapy by going dormant

Cancer cells can dodge chemotherapy by entering a state that bears similarity to certain kinds of senescence, a type of "active hibernation" that enables them to weather the stress induced by aggressive treatments aimed at destroying them, according to a new study by scientists.

These findings have implications for developing new drug combinations that could block senescence and make chemotherapy more effective.

The investigators reported that this biologic process could help explain why cancers so often recur after treatment. The research was done in both organoids and mouse models made from patients' samples of acute myeloid leukemia (AML) tumors. The findings were also verified by looking at samples from AML patients that were collected throughout the course of treatment and relapse.

Acute myeloid leukemia can be put into remission with chemotherapy, but it almost always comes back, and when it does it's incurable.

For years, cancer researchers have studied how tumors are able to rebound after they appear to be completely wiped out by chemotherapy. One theory has been that because not all cells within a tumor are the same at the genetic level—a condition called tumor heterogeneity—a small subset of cells are able to resist treatment and begin growing again. Another theory involves the idea of tumor stem cells—that some of the cells within a tumor have special properties that allow them to re-form a tumor after chemotherapy has been given. The idea that senescence is involved does not replace these other theories. In fact, it could provide new insight into explaining these other processes.

In the study, the researchers found that when AML cells were exposed to chemotherapy, a subset of the cells went into a state of hibernation, or senescence, while at the same time assuming a condition that looked very much like inflammation. They looked similar to cells that have undergone an injury and need to promote wound healing—shutting down the majority of their functions while recruiting immune cells to nurse them back to health.

"These characteristics are also commonly seen in developing embryos that temporarily shut down their growth due to lack of nutrition, a state called embryonic diapause. Further research revealed that this inflammatory senescent state was induced by a protein called ATR, suggesting that blocking ATR could be a way to prevent cancer cells from adopting this condition. The investigators tested this hypothesis in the lab and confirmed that giving leukemia cells an ATR inhibitor before chemotherapy prevented them from entering senescence, thereby allowing chemotherapy to kill all of the cells.

Importantly, studies published at the same time from two other groups reported that the role of senescence is important not just for AML, but for recurrent cases of breast cancer, prostate cancer and gastrointestinal cancers as well.

Cihangir Duy et al. Chemotherapy induces senescence-like resilient cells capable of initiating AML recurrence, Cancer Discovery (2021). DOI: 10.1158/2159-8290.CD-20-1375

https://medicalxpress.com/news/2021-03-cancer-cells-evade-chemother...

Comment by Dr. Krishna Kumari Challa on March 16, 2021 at 11:34am

Scientists  discovered plants beneath mile-deep Greenland ice

In 1966, US Army scientists drilled down through nearly a mile of ice in northwestern Greenland—and pulled up a fifteen-foot-long tube of dirt from the bottom. Then this frozen sediment was lost in a freezer for decades. It was accidentally rediscovered in 2017.

In 2019, University of Vermont scientist Andrew Christ looked at it through his microscope—and couldn't believe what he was seeing: twigs and leaves instead of just sand and rock. That suggested that the ice was gone in the recent geologic past—and that a vegetated landscape, perhaps a boreal forest, stood where a mile-deep ice sheet as big as Alaska stands today.

Over the last year, Christ and an international team of scientists—led by Paul Bierman at UVM, Joerg Schaefer at Columbia University and Dorthe Dahl-Jensen at the University of Copenhagen—have studied these one-of-a-kind fossil plants and sediment from the bottom of Greenland. Their results show that most, or all, of Greenland must have been ice-free within the last million years, perhaps even the last few hundred-thousand years.

Ice sheets typically pulverize and destroy everything in their path," says Christ, "but what we discovered was delicate plant structures—perfectly preserved. They're fossils, but they look like they died yesterday. It's a time capsule of what used to live on Greenland that we wouldn't be able to find anywhere else."

The discovery helps confirm a new and troubling understanding that the Greenland ice has melted off entirely during recent warm periods in Earth's history—periods like the one we are now creating with human-caused climate change.

Understanding the Greenland Ice Sheet in the past is critical for predicting how it will respond to climate warming in the future and how quickly it will melt. 

Andrew J. Christ el al., "A multimillion-year-old record of Greenland vegetation and glacial history preserved in sediment beneath 1.4 km of ice at Camp Century," PNAS (2021). www.pnas.org/cgi/doi/10.1073/pnas.2021442118

https://phys.org/news/2021-03-scientists-stunned-beneath-mile-deep-...

Comment by Dr. Krishna Kumari Challa on March 15, 2021 at 12:04pm

Wearable microgrid runs on renewable energy from the body

Comment by Dr. Krishna Kumari Challa on March 15, 2021 at 11:53am

Juno Discovers Mars’ Dust Storms Fill Solar System

Comment by Dr. Krishna Kumari Challa on March 15, 2021 at 11:48am

Skin-immersion study shows serious damage after 12 hours in water
A new study from Binghamton University researchers could change the way that medical professionals and scientists think about the long-term effects of skin immersion in water.
Researchers tested samples of stratum corneum (the outer layer of human skin) from subjects 27 to 87 years old.

After 12 hours of immersion, the skin loses plasticity because of reduced ability to hold water. It also depletes both lipids and natural moisturizing factors, which can lead to long-term problems.

Essity, a global hygiene and health firm based on Sweden, helped to fund the study and assisted in the research to better understand skin damage caused by diaper dermatitis, when infants or incontinent adults are not regularly changed.
the findings have implications in a variety of different fields, including cryo-preservation, organ transport for transplantation, divers’ health, forensics and various foot-immersion syndromes.
https://pdf.sciencedirectassets.com/271007/1-s2.0-S0022202X73X90005...

https://www.binghamton.edu/news/story/2913/skin-immersion-study-sho....
https://researchnews.cc/news/5641/Skin-immersion-study-shows-seriou...

Comment by Dr. Krishna Kumari Challa on March 15, 2021 at 9:48am

Female scientists who changed the world – from discovering radioactivity to making Covid-19 vaccines

Female scientists who changed the world – from HIV tests to Covid-19 vaccines

IN honour of Women’s History Month we’ve rounded up some of the most amazing female scientists you should know about.

.... from discovering radioactivity to making Covid-19 vaccines

https://www.thesun.co.uk/tech/14321964/female-scientists-who-change...

Comment by Dr. Krishna Kumari Challa on March 13, 2021 at 12:35pm

Faster-Than-Light Travel Is Possible Within Einstein's Physics, Astrophysicist Shows

Physicists are not the kind of people who give up easily, though. Give them an impossible dream, and they'll give you an incredible, hypothetical way of making it a reality. Maybe.

In a new study by physicist Erik Lentz from Göttingen University in Germany, we may have a viable solution to the dilemma, and it's one that could turn out to be more feasible than other would-be warp drives.

This is an area that attracts plenty of bright ideas, each offering a different approach to solving the puzzle of faster-than-light travel: achieving a means of sending something across space at superluminal speeds.

There are some problems with this notion, however. Within conventional physics, in accordance with Albert Einstein's theories of relativity, there's no real way to reach or exceed the speed of light, which is something we'd need for any journey measured in light-years.

That hasn't stopped physicists from trying to break this universal speed limit, though.

While pushing matter past the speed of light will always be a big no-no, spacetime itself has no such rule. In fact, the far reaches of the Universe are already stretching away faster than its light could ever hope to match.

To bend a small bubble of space in a similar fashion for transport purposes, we'd need to solve relativity's equations to create a density of energy that's lower than the emptiness of space. While this kind of negative energy happens on a quantum scale, piling up enough in the form of 'negative mass' is still a realm for exotic physics.

In addition to facilitating other kinds of abstract possibilities, such as wormholes and time travel, negative energy could help power what's known as the Alcubierre warp drive.

This speculative concept would make use of negative energy principles to warp space around a hypothetical spacecraft, enabling it to effectively travel faster than light without challenging traditional physical laws, except for the reasons explained above, we can't hope to provide such a fantastical fuel source to begin with.

https://www.sciencealert.com/faster-than-light-travel-is-possible-w...

Comment by Dr. Krishna Kumari Challa on March 13, 2021 at 12:30pm

Scientists Find a Natural Protein That Stops Allergies And Autoimmune Conditions

It's called neuritin.

Using transgenic mice and cultures of cells taken from human tonsils, researchers have now found evidence of how our bodies might defend against the mistakes that result in conditions such as asthma, food allergies, and lupus. They found a protein called neuritin, produced by immune cells. It acts a bit like an inbuilt, boss-level antihistamine.

Neuritin suppresses formation of rogue plasma cells which are the cells that produce harmful antibodies.

https://www.cell.com/cell/fulltext/S0092-8674(21)00177-X?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS009286742100177X%3Fshowall%3Dtrue

https://www.sciencealert.com/our-bodies-do-have-a-natural-answer-fo...

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