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Comment by Dr. Krishna Kumari Challa on December 23, 2020 at 10:08am

Scientists invent glue activated by magnetic field

Scientists from Nanyang Technological University, Singapore (NTU Singapore), have developed a new way to cure adhesives using a magnetic field.

Conventional adhesives like epoxy which are used to bond plastic, ceramics and wood are typically designed to cure using moisture, heat or light. They often require specific curing temperatures, ranging from room temperature up to 80 degrees Celsius.

The curing process is necessary to cross-link and bond the glue with the two secured surfaces as the glue crystallizes and hardens to achieve its final strength.

NTU's new 'magnetocuring' glue can cure by passing it through a magnetic field. This is very useful in certain environmental conditions where current adhesives do not work well. Also, when the adhesive is sandwiched between insulating material like rubber or wood, traditional activators like heat, light and air cannot easily reach the adhesive.

The new adhesive is made of two main components—a commercially available epoxy that is cured through heat, and oxide nanoparticles made from a chemical combination including manganese, zinc and iron (MnxZn_1-xFe₂O₄).

These nanoparticles are designed to heat up when electromagnetic energy is passed through them, activating the curing process. The maximum temperature and rate of heating can be controlled by these special nanoparticles, eliminating overheating and hotspot formation.

Richa Chaudhary et al, Magnetocuring of temperature failsafe epoxy adhesives, Applied Materials Today (2020). DOI: 10.1016/j.apmt.2020.100824

https://phys.org/news/2020-12-scientists-magnetic-field.html?utm_so...

Comment by Dr. Krishna Kumari Challa on December 23, 2020 at 9:46am

Chemists describe a new form of ice

Scientists have described the structure and properties of a novel hydrogen clathrate hydrate that forms at room temperature and relatively low pressure. Hydrogen hydrates are a potential solution for storage and transportation of hydrogen, the most environmentally friendly fuel.
Ice is a highly complex substance that has multiple polymorphic modifications that keep growing in number as scientists make new discoveries. The physical properties of ice vary greatly, too: for example, hydrogen bonds become symmetric at high pressures, making it impossible to distinguish a single water molecule, whereas low pressures cause proton disorder, placing water molecules in many possible spatial orientations within the crystal structure. Ice around us, including snowflakes, is always proton-disordered. Ice can incorporate xenon, chlorine, carbon dioxide or methane molecules and form gas hydrates which often have a different structure from pure ice. The vast bulk of Earth's natural gas exists in the form of gas hydrates.
In their new study, the chemists focused on hydrogen hydrates. Gas hydrates hold great interest both for theoretical research and practical applications, such as hydrogen storage. If stored in its natural form, hydrogen poses an explosion hazard, whereas density is way too low even in compressed hydrogen. That is why scientists are looking for cost-effective hydrogen storage solutions.
This is not the first time we turn to hydrogen hydrates. In our previous research, we predicted a novel hydrogen hydrate with 2 hydrogen molecules per water molecule. Unfortunately, this exceptional hydrate can only exist at pressures above 380,000 atmospheres, which is easy to achieve in the lab, but is hardly usable in practical applications. The new paper describes hydrates that contain less hydrogen but can exist at much lower pressures.

Yu Wang et al. Novel Hydrogen Clathrate Hydrate, Physical Review Letters (2020). DOI: 10.1103/PhysRevLett.125.255702

https://phys.org/news/2020-12-chemists-ice.html?utm_source=nwletter...

Comment by Dr. Krishna Kumari Challa on December 23, 2020 at 9:30am

Masks not enough to stop COVID-19's spread without distancing: study

Simply wearing a mask may not be enough to prevent the spread of COVID-19 without social distancing.

In Physics of Fluids, researchers tested how five different types of mask materials impacted the spread of droplets that carry the coronavirus when we cough or sneeze.

Every material tested dramatically reduced the number of droplets that were spread. But at distances of less than 6 feet, enough droplets to potentially cause illness still made it through several of the materials.

"A mask definitely helps, but if the people are very close to each other, there is still a chance of spreading or contracting the virus".

Without a face mask, it is almost certain that many foreign droplets will transfer to the susceptible person. "Wearing a mask will offer substantial, but not complete, protection to a susceptible person by decreasing the number of foreign airborne sneeze and cough droplets that would otherwise enter the person without the mask. Consideration must be given to minimize or avoid close face-to-face or frontal human interactions, if possible."

The study also did not account for leakage from masks, whether worn properly or improperly, which can add to the number of droplets that make their way into the air.

"Can face masks offer protection from airborne sneeze and cough droplets in close-up, face-to-face human interactions? A quantitative study," Physics of Fluids, aip.scitation.org/doi/10.1063/5.0035072

https://phys.org/news/2020-12-masks-covid-distancing.html?utm_sourc...

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Comment by Dr. Krishna Kumari Challa on December 23, 2020 at 8:43am

Detecting COVID-19 antibodies in 10 seconds

Researchers at Carnegie Mellon University report findings on an advanced nanomaterial-based biosensing platform that detects, within seconds, antibodies specific to SARS-CoV-2, the virus responsible for the COVID-19 pandemic. In addition to testing, the platform will help to quantify patient immunological response to the new vaccines with precision.

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Visible hydrogels for rapid hemorrhage control and monitoring

There are many different events which may lead to excessive and uncontrolled bleeding within the body. This can occur as a result of inflammation and ulcerations, abnormalities in the blood vessels or trauma-related injuries. Individuals with predisposing conditions, such as cardiac patients, are at particular risk of internal bleeding due to the anticoagulants they are often prescribed as a preventive measure. They are also prone to gastrointestinal bleeds, affecting 40% of patients who are on cardiac assistance devices. In addition to the need for an effective treatment for these conditions, there are also indications for controlling the blood flow that contribute to aneurysms and tumor cell vascularization.

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Comment by Dr. Krishna Kumari Challa on December 23, 2020 at 8:15am

Scientists discover mutations associated with early onset dementia

Scientists recently announced a significant advance in our understanding of an early onset form of dementia that may also progress our understanding of conditions such as Alzheimer's disease.

Adult onset Leukoencephalopathy with axonal Spheroids and Pigmented glia (ALSP) is an ultra-rare condition characterized by mutations in a gene called Colony stimulating factor-1 receptor (CSF1R). The condition manifests initially with psychiatric and behavioral changes in patients followed by a rapid progression of dementia in the third or fourth decade of life. While the condition is very rare, for affected families it can represent a devastating diagnosis.

As the condition involves the degeneration of white matter in the brain, scientists previously thought that immune cells within the brain termed microglia were the primary culprits in driving pathology observed in this condition.

However, the Trinity team, working with patient samples as well as pre-clinical models, were able to show that dysfunctional circulating white blood cells were the key driver of neurodegeneration.

These findings have shed light on a novel mechanism of neurodegeneration that may ultimately teach us more about common forms of dementia. Importantly, the work has identified that a disruption in CSF1R function in patients, as well as in pre-clinical models, induces damage to the so-called blood-brain barrier (BBB). This damage can subsequently change the integrity of capillaries in the brain, causing them to leak and spark the deterioration of the brain. Intriguingly, dysfunctional white blood cells seem to be the main driver of this BBB breakdown.

EMBO Molecular Medicine (2020). DOI: 10.15252/emmm.202012889

Researchers discover how the brain 're-wires' after disease

https://medicalxpress.com/news/2020-12-scientists-mutations-early-o...

Comment by Dr. Krishna Kumari Challa on December 23, 2020 at 8:02am

Regulatory RNAs promote breast cancer metastasis

Scientists have discovered a gene-regulating snippet of RNA that may contribute to the spread of many breast cancers. In animal experiments, the researchers could reduce the growth of metastatic tumours with a molecule designed to target that RNA and trigger its destruction. The same strategy, they say, could be used to develop a new breast cancer treatment for patients.

They  identified dozens of RNA molecules that were more prevalent in breast cancer cells than in noncancerous cells of the same type. All were long, non-coding RNAs (lncRNAs)—RNA molecules that do not encode proteins and are thought to play various regulatory roles inside cells. The current study investigated how one of these, Mammary Tumor-Associated RNA 25 (MaTAR 25), impacted breast cancer cells' behavior in mice.

Experiments  indicate the molecule contributes to cancer's progression in several ways—revving up cells' growth as well as their ability to migrate and invade tissue. These effects may be due to changes in the activity of the tensin1 gene, which the team found is one of MaTAR 25's targets. Tensin1 helps connect a cell's internal cytoskeleton to the external matrix that surrounds it and is therefore positioned to influence a cell's movement as well as its growth-regulating pathways.

Nature Communications (2020). DOI: 10.1038/s41467-020-20207-y

https://medicalxpress.com/news/2020-12-regulatory-rnas-breast-cance...

Comment by Dr. Krishna Kumari Challa on December 23, 2020 at 7:38am

Researchers find hydrogen-supported life beneath glaciers

Using years of data collected from ice-covered habitats all over the world, a research team has discovered new insights into the processes that support microbial life underneath ice sheets and glaciers, and the role those organisms play in perpetuating life through ice ages and, perhaps, in seemingly inhospitable environments on other planets.

The work examines the ways water and microbes interact with the bedrock beneath glaciers, using samples of sediment taken from glacial sites in Canada and Iceland. 

The researchers found organisms in these systems that were supported by hydrogen gas. 

A team of researchers later discovered that through a series of physical and chemical processes, hydrogen gas is produced as the silica-rich bedrock underneath glaciers is ground into tiny mineral particles by the weight of the ice on top of it. When those mineral particles combine with glacial meltwater, they let off hydrogen.

What became even more fascinating was that microbial communities under the glaciers could combine that hydrogen gas with carbon dioxide to generate more organic matter, called biomass, through a process called chemosynthesis. Chemosynthesis is similar to how plants generate biomass from carbon dioxide through photosynthesis, although chemosynthesis does not require sunlight.

As they use hydrogen  gas to generate energy the microbes also pull CO2out of the air to create biomass, replicate and grow. That ability to "fix" carbon is a critical climate regulation process, another similarity to photosynthesis in plants.

The newfound knowledge that self-sustaining microbial communities can flourish in icy environments through the generation of hydrogen gas is a critical step toward identifying potentially habitable environments on other planets.

Lithogenic hydrogen supports microbial primary production in subglacial and proglacial environments PNAS; doi.org/10.1073/pnas.2007051117

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It was also found that not only was it possible to track the communities' growth in the lab environment but also that the type of bedrock underlying a glacier influenced how much hydrogen gas was produced, which in turn led to the presence of microbial communities that were better adapted to metabolizing hydrogen.

https://phys.org/news/2020-12-hydrogen-supported-life-beneath-glaci...

Comment by Dr. Krishna Kumari Challa on December 22, 2020 at 10:38am

Octopuses punch fishes during collaborative interspecific hunting events

Octopuses Observed Punching Fish, Perhaps Out of Spite, Scientists Say

In new proof that 2020 has been a crappy year basically everywhere, scientists have captured video evidence of octopuses randomly punching at fish, possibly for no reason other than being spiteful.

While this remarkable, rather nasty-sounding behaviour might seem like it comes from a place of direct conflict between different animal species, that's not the whole story, researchers say.

In fact, this antisocial fish-punching phenomenon – which scientists term "active displacement" of fish – occurs in the midst of collaborative hunting efforts, in which octopuses and fish team up to chase and trap prey together.

https://twitter.com/OctoEduardo/status/1340076579108646913

https://twitter.com/ESAEcology/status/1341125791359373313?s=20

https://esajournals.onlinelibrary.wiley.com/doi/10.1002/ecy.3266

Comment by Dr. Krishna Kumari Challa on December 22, 2020 at 9:44am

Researchers to resuscitate eyes, speed up clinical research for vision impairment

Researchers to resuscitate eyes, speed up clinical research for vision impairment

Researchers are developing a new method to bring eyes back to life from deceased body donors for clinical research purposes.

They are creating a device that resuscitates eyes from the dead.Vision impairment affects over 250 million people worldwide, with thirty-six million people being blind. Retinal degeneration is often incurable, and ageing populations worldwide are major social and economic challenges.

The device, codenamed ECaBox, will be a transparent, cubic box that mimics conditions in the living human eye, maintaining the eye’s temperature and pH levels while avoiding blood clots and removing metabolic waste and toxins. Inside the ECaBox will be donor human eyeballs. The immediate goal is to test novel stem cell therapies without fear of risking patient harm on this platform.

Artificial blood will also be developed to provide cells with oxygen and nutrients, kick-starting the activity of nerve cells and restoring total eye function. Artificial vitreous humour will maintain the eye’s ocular pressure.

The health of the eyeball will be continuously monitored to confirm retinal function and regeneration. Beyond this scope, this technology can be extended to keep donor eyes intact for transplantation purposes, extending the current 48-hour window limit.

For many patients whose hope to restore their vision rests on emerging therapeutics, this research will mean a quicker and safer development cycle that will lead to the treatments becoming available sooner

Current technological limitations mean that eyes can only be kept at 4ºC for a period of 48 hours before irreversible degradation. This greatly limits their use for experiments, particularly to test the effectiveness of new drugs and treatments.

While advances in human organoids, growing tissues in a petri dish, are successfully mimicking the function of the eye, they fail to encapsulate the eye’s physiological complexity, such as its immune, vasculature, and metabolism systems.

There are a huge number of potential new treatments and therapies for eye damage and vision loss, but the eyewatering cost of running a clinical trial can mean they never reach the market.”

This new method can greatly improve the preclinical validation steps for these treatments, supporting the screening of a larger number of candidates and helping promising drugs escape the ‘valley of death’ imposed by cost-benefit analyses in the pharmaceutical industry.

https://www.kcl.ac.uk/news/researchers-to-resuscitate-eyes-speed-up...

https://researchnews.cc/news/4226/Researchers-to-resuscitate-eyes--...

Comment by Dr. Krishna Kumari Challa on December 22, 2020 at 8:56am

Gravity Assist: The Bright Spot of the Asteroid Belt

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