Tuesday, 24 October 2023
Is ChatGPT smarter than a Doctor ?
Wednesday, 20 September 2023
Is Elon Musk's Proposed "Small Fee" for Twitter a Game-Changer or a Gamble?
Monday, 31 July 2023
Snoring Could Be Harming Your Brain
Monday, 12 June 2023
The Role of Multivitamins in Memory Boost and Slowing Cognitive Aging
Friday, 19 May 2023
18 Things You Need to Stop Doing If You Want to Be Successful.
Thursday, 11 May 2023
Intellectual Characters
Healing Hands in Danger: The Plight of Violence Against Doctors
Doctors are healers, with hands that mend
Sunday, 7 May 2023
My religion is love and kindness
Physicists Broke The Speed of Light With Pulses Inside Hot Plasma
The speed of light has been considered as the ultimate speed limit for a long time. However, in recent years, physicists have made some groundbreaking discoveries that challenge this notion. One such breakthrough involves the use of pulses inside hot plasma to break the speed of light. This article will explore this fascinating discovery and its potential implications for the field of physics.
Introduction
The speed of light, which is approximately 299,792,458 meters per second, has been considered as the ultimate speed limit in the universe. This limit is based on Albert Einstein’s theory of relativity, which states that nothing can travel faster than the speed of light. However, recent experiments have shown that it may be possible to exceed this speed limit using a technique known as pulse shaping.
What is Pulse Shaping?
Pulse shaping is a technique used in optics and laser physics to manipulate the shape of light pulses. This technique involves altering the amplitude, phase, and frequency of a light pulse to achieve a desired shape. Pulse shaping is used in a variety of applications, including ultrafast spectroscopy, optical communication, and laser material processing.
The Experiment
Physicists at the Imperial College London, led by Dr. Stuart Mangles, conducted an experiment to investigate the possibility of breaking the speed of light using pulse shaping. The team used a high-power laser to create a plasma by heating a gas. They then used pulse shaping to create a pair of laser pulses that traveled through the plasma.
The first pulse was designed to create a channel through the plasma, while the second pulse was designed to follow this channel. The team observed that the second pulse arrived at its destination faster than the speed of light in a vacuum.
The Results
The results of the experiment were surprising. The team observed that the second pulse arrived at its destination 30 femtoseconds faster than the speed of light in a vacuum. This may seem like a tiny amount of time, but it is significant in the world of physics. This discovery challenges the notion that the speed of light is an absolute speed limit.
The Implications
The implications of this discovery are vast. If it is possible to break the speed of light using pulse shaping, it could revolutionize the field of physics. It could lead to the development of faster-than-light communication, which could have a significant impact on the world of telecommunications. It could also lead to new discoveries in the field of astrophysics, as it could allow us to study the universe in more detail.
Conclusion
In conclusion, the discovery that it may be possible to break the speed of light using pulse shaping is a significant breakthrough in the field of physics. It challenges the notion that the speed of light is an absolute speed limit and opens up new possibilities for the future. It will be interesting to see what further discoveries will be made in this exciting field of research.
FAQs
What is the speed of light? The speed of light is approximately 299,792,458 meters per second.
What is pulse shaping? Pulse shaping is a technique used in optics and laser physics to manipulate the shape of light pulses.
What is the experiment conducted by the physicists at the Imperial College London? The physicists at the Imperial College London conducted an experiment to investigate the possibility of breaking the speed of light using pulse shaping.
What are the implications of this discovery? The implications of this discovery are vast. It could lead to the development of faster-than-light communication and new discoveries in the field of astrophysics.
Sunday, 23 April 2023
Had COVID? Part of the Virus May Stick Around in Your Brain
If you or someone you know is experiencing "brain
fog" after COVID-19, scientists now have a possible explanation — and it
might not bring much comfort.
Researchers in Germany found that part of the virus, the
spike protein, remains in the brain long after the virus clears out.
These investigators discovered the spike protein from the
virus in brain tissue of animals and people after death. The finding suggests
these virus fragments build up, stick around, and trigger inflammation that
causes long COVID symptoms.
About 15% of COVID patients continue to have long-term
effects of the infection despite their recovery, said senior study author Ali
Ertürk, PhD, director of the Institute for Tissue Engineering and Regenerative
Medicine at the Helmholtz Center Munich in Germany.
Reported neurological problems include brain fog, brain
tissue loss, a decline in thinking abilities, and problems with memory, he
said.
"These symptoms clearly suggest damages and long-term
changes caused by SARS-CoV-2 in the brain, the exact molecular mechanisms of
which are still poorly understood," Ertürk said.
The researchers also propose a way the spike protein can get
into the brain in their preprint report published online before peer review
April 5 on bioRxiv.
Delivered by circulating blood, the spike protein can stay
inside small openings in the bone marrow of the skull called niches. It can
also reside in the meninges, thin layers of cells that act as a buffer between
the skull and the brain. From there, one theory goes, the spike protein uses
channels to enter the brain itself.
The hope is researchers can develop treatments that block
one or more steps in this process and help people avoid long COVID brain
issues.
'Very Concerning'
"This is a very concerning report that literally
demonstrates the SARS-CoV-2 spike protein in the skull-meninges-brain axis in postmortem
individuals," said Eric Topol, MD, director of the Scripps Research
Translational Institute in La Jolla, CA, and editor-in-chief of Medscape,
WebMD's sister site for medical professionals.
Having the spike protein accumulate in structures right outside
the brain and causing ongoing inflammation makes sense to Topol. The clustering
of spike proteins would trigger an immune response from this niche reservoir of
immune cells that cause the inflammation associated with long COVID and the
symptoms such as brain fog, he said.
Problems with thinking and memory after COVID infection are
relatively common. One research team found 22% of people with long COVID
specifically reported this issue, on average, across 43 published studies. Even
people who had mild COVID illness can develop brain fog later, Ertürk and
colleagues note.
So why are researchers blaming the spike protein and not the
whole COVID virus? As part of the study, they found SARS-CoV-2 virus RNA in
some people after death and not in others, suggesting the virus does not need
to be there to trigger brain fog. They also injected the spike protein directly
into the brains of mice and showed it can cause cells to die.
Researchers also found no SARS-CoV-2 virus in the brain
parenchyma, the functional tissue in the brain containing nerve cells and
non-nerve (called glial) cells, but they did detect the spike protein there.
Surprising Findings
Investigators were surprised to find spike protein in the
skull niches of people who survived COVID and died later from another cause.
Ertürk, lead author and PhD student Zhouyi Rong, and their colleagues found
spike protein in 10 of 34 skulls from people who died from non-COVID causes in
2021 and 2022.
They also found COVID can change how proteins act in and
around the brain. Some of these proteins are linked to Parkinson's disease and
Alzheimer's disease, but have never before been linked to the virus
Another unexpected finding was how close the findings were
in mice and humans. There was a "remarkable similarity of distribution of
the viral spike protein and dysregulated proteins identified in the mouse and
human samples," Ertürk said.
Future Treatments?
Tests for protein changes in the skull or meninges would be
invasive but possible compared to sampling the parenchyma inside the brain.
Even less invasive would be testing blood samples for altered proteins that
could identify people most at risk of developing brain complications after
COVID illness.
It will take more brain science to get there.
"Designing treatment strategies for these neurological symptoms requires
an in-depth knowledge of molecules dysregulated by the virus in the brain
tissues," Ertürk said.