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Comment by Dr. Krishna Kumari Challa on February 12, 2016 at 7:16am

WORLD, WE HAVE DETECTED GRAVITATIONAL WAVES! 

After 100 years of searching, an international team of physicists has confirmed the existence of Einstein's gravitational waves, marking one of the biggest astrophysical discoveries of the past century. It's a huge deal, because it not only improves our understanding of how the Universe works, it also opens up a whole new way of studying it.

The gravitational wave signal was detected by physicists at LIGO on September 14 last year, and the historic announcement was made at a press conference on 11th Feb., 2016.

Gravitational waves are so exciting because they were the last major prediction of Einstein's general theory of relativity that had to be confirmed, and discovering them will help us understand how the Universe is shaped by mass.

Gravitational waves are akin to sound waves that travelled through space at the speed of light. What does that mean for us? Now that we can detect gravitational waves, we're going to have a whole new way to see and study the Universe. 

According to Einstein's theory, the fabric of space-time can become curved by anything massive in the Universe. When cataclysmic events happen, such as black holes merging or stars exploding, these curves can ripple out elsewhere as gravitational waves, just like if someone had dropped a stone in a pond.

By the time those ripples get to us on Earth, they're tiny (around a billionth of the diameter of an atom), which is why scientists have struggled for so many years to find them.

But thanks to LIGO - the laser interferometer gravitational-wave observatory - we've finally been able to detect them. The LIGO laboratory works by bouncing lasers back and forth in two 4-km-long pipes, allowing physicists to measure incredibly small changes in spacetime.

One 14 September 2015, they picked up a relatively big change in their Livingston lab in Louisiana, what you'd call a blip in the system. Then, 7 milliseconds later, they detected the same blip with their lab in Hanford, Washington, 4,000 km away, suggesting that it had been caused by a gravitational wave passing through Earth. 

In the months since, researchers have been rigorously studying this signal to see if it could have been caused by anything else. But the overwhelming conclusion is that the blip was caused by gravitational waves - the discovery has statistical significant of 5.1 sigma, which means there's only a 1 in 6 million chance that the result is a fluke.

In fact, the signal almost perfectly matches up with what scientists predicted gravitational waves would look like, based on Einstein's theory. 

So where did this gravitational wave come from? The physicists were able to trace the signal back to the merging of two black holes around 1.3 billion years ago. 

This event - which in itself is a big deal, seeing as no one had ever spotted a binary black hole merger before - was so massive that it significantly warped the fabric of space time, creating ripples that spread out across the Universe... finally reaching us last year.

But this is just the beginning of what gravitational waves can teach us - several other gravitational wave observatories and detectors are scheduled to come online in the next five years, and they'll allow us to more sensitively detect gravitational radiation.

This initiates a new phase in the exploration of the universe and in our search for the physical laws that govern it.

http://journals.aps.org/prl/

http://physics.aps.org/articles/v9/17

Comment by Dr. Krishna Kumari Challa on February 11, 2016 at 8:19am

Vinegar is the perfect ingredient for making tangy sauces and dressings. Now, researchers report in ACS' Journal of Agricultural and Food Chemistry that the popular liquid could also help fight ulcerative colitis, an inflammatory bowel disease that research suggests is related to the gut microbiome. They found that vinegar suppressed inflammation-inducing proteins while improving the gut's bacterial makeup in mice.
Ulcerative colitis is a chronic condition that affects millions of people around the world. Although its cause isn't completely understood, research suggests that bacteria in the gastrointestinal tract play an important part. People with the condition experience repeated inflammation of the large intestine's lining, which can cause ulcers, abdominal pain, diarrhea and other symptoms. At least one recent study suggested that vinegar, which has been used in traditional medicine for centuries, might be effective against ulcerative colitis.
The researchers tested vinegar and its main ingredient, acetic acid, in a mouse model of ulcerative colitis. Giving the mice either substance by adding it in small amounts to their drinking water significantly reduced symptoms of the condition. An analysis of mouse stool samples showed that treated animals had higher levels of bacteria, such as Lactobacillus and Bifidobacteria. Other studies have found these bacteria to be beneficial to mice with colitis-like symptoms. Treatment also lowered the levels of proteins that induce potentially damaging inflammation in the gut. The researchers say further work would be needed to determine vinegar's effects on ulcerative colitis in humans.

Comment by Dr. Krishna Kumari Challa on February 10, 2016 at 11:55am

Steady streams of tiny plastic pieces making their way into the ocean give microbial squatters a place to take up residence. Each plastic home comes equipped with a solid surface to live on in an otherwise watery world. These floating synthetic dwellings and their microbial inhabitants have a name: the plastisphere.
Plastic particles, in concentrations averaging 3500 pieces and 290 grams per square kilometer, are widespread in the western Sargasso Sea. Pieces are brittle, apparently due to the weathering of the plasticizers, and many are in a pellet shape about 0.25 to 0.5 centimeters in diameter. The particles are surfaces for the attachment of diatoms and hydroids. Increasing production of plastics, combined with present waste-disposal practices, will undoubtedly lead to increases in the concentration of these particles. Plastics could be a source of some of the polychlorinated biphenyls recently observed in oceanic organisms.
http://science.sciencemag.org/content/175/4027/1240.abstract

Microbes of the plastisphere live in waters from Australia to Europe. They differ by location, are as varied as the plastic they live on and can be a tasty food option for other creatures. What impact — good or bad — the microbe-covered plastic has on the oceans is still in question. Early hints suggest that there may be climate effects and unexpected movement of harmful microbes or other creatures to new destinations. Each study sparks new ideas and new theories.
More recent estimates put the amount of plastic floating in the world’s oceans at more than 5.25 trillion pieces, weighing more than 268,000 metric tons (SN: 1/24/15, p. 4). That translates to as much as 100,000 pieces per square kilometer in some areas of the ocean.
These microplastics are no bigger than 5 millimeters across and come from many sources. Some are broken bits of larger plastic pieces. Others, such as synthetic fibers from clothing and plastic beads from toothpastes and face washes, escape cleaning filters at wastewater treatment plants and end up in the ocean.
- Science News

Comment by Dr. Krishna Kumari Challa on February 10, 2016 at 11:06am

Cyanobacteria use micro-optics to sense light direction

Biologists say they have solved the riddle of how a tiny bacterium senses light and moves towards it: the entire organism acts like an eyeball.
In a single-celled pond slime, they observed how incoming rays are bent by the bug's spherical surface and focused in a spot on the far side of the cell.
By shuffling along in the opposite direction to that bright spot, the microbe then moves towards the light.
Other scientists were surprised and impressed by this "elegant" discovery.
Despite being just three micrometres (0.003mm) in diameter, the bacteria in the study use the same physical principles as the eye of a camera or a human.
This makes them "probably the world's smallest and oldest example" of such a lens, the researchers write in the journal eLife.
Cyanobacteria, including the Synechocystis species used in the study, are an ancient and abundant lifeform. They live in water and get their energy from photosynthesis - which explains their enthusiasm for bright light.
http://elifesciences.org/content/5/e12620

http://elifesciences.org/content/5/e14169?utm_source=content_alert&...

Comment by Dr. Krishna Kumari Challa on February 10, 2016 at 6:54am

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The Sun could produce a superflare, study says
It appears that our Sun could be capable of producing a “superflare”, which is a mysterious phenomenon that was discovered by the Kepler space mission four years ago, according to researchers from the Aarhus University. They describe the possibility as “frightening”, since more modest Sun storms, with less power than a superflare, have affected the Earth in previous years.

Solar strikes often reach the Earth, when energetic particles are thrown away from the Sun into Space. When these eruptions interfere with our planet, they generate auroras. However, a different type of eruption called “superflares” that remain a mystery for the scientific community, could cause severe consequences to Earth.

It remained unclear whether the Sun could produce a superflare under the same mechanism it uses to produce a solar flare. An international team led by Christoffer Karoff, from Aarhus University in Denmark, suggests that possibilities are weak, but it is still not impossible.
The Sun has been described as a “dangerous neighbor”. A report published by the team in the journal Nature Communications mentions how a solar eruption of hot plasma reached the Earth in September 1859, creating an aurora and breaking down some radio communications.

Comment by Dr. Krishna Kumari Challa on February 9, 2016 at 7:23am

Eating fortified rice increases the risk of hookworm infections, if you don't practice good hygiene and don't provide clean sanitary conditions for children, a study in Cambodian schoolchildren shows, suggesting that the rice’s added nutrients inadvertently help parasites grow.

The study’s authors warn that the overall health benefits of fortified rice should be weighed against possible health risks.

The researchers analysed faecal samples from about 2,000 children at 16 primary schools that participate in a UN World Food Programme initiative that provides daily meals to schoolchildren. The schools were randomly split into four groups: children in one group ate plain, ‘placebo’ rice, while the other groups received three different types of rice fortified with micronutrients including iron, zinc, folate and different vitamins.
“There is absolutely an important role to play for fortified rice, but it should be tailor-made to the local situation.”

Frank Wieringa, French Research Institute for Development

After three and seven months, the researchers measured levels of intestinal parasite infections. “Micronutrient-fortified rice significantly increased risk of new hookworm infection,” the team writes in a paper published in PLOS One last month (6 January).

The paper rightly emphasises the need for improved hygiene and sanitation “for nutritional intervention to be effective and produce desirable nutritional and health benefits."
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.01...

Comment by Dr. Krishna Kumari Challa on February 9, 2016 at 7:06am

A multi-disciplinary group of researchers at the University of Maryland School of Medicine (UM SOM) have for the first time determined the genetic makeup of various strains of E. coli, which every year kills hundreds of thousands of people around the world.
The researchers analyzed the genetic differences between the strains and mapped them onto disease outcome. Then, they divided the strains into categories, based on genetic content and clinical outcome.
The paper, which appears in a recent issue of Nature Microbiology, analyzed the DNA of Enteropathogenic Escherichia coli (EPEC), which are the strains of the bacteria that cause diarrhea.

The scientists, led by David Rasko, PhD, Associate Professor of Microbiology and Immunology at the Institute for Genome Sciences (IGS) at UM SOM and Michael Donnenberg, MD, Professor of Medicine at UM SOM, identified certain strains that are typically much more lethal than others. The results will help researchers focus efforts to identify, treat and potentially control these more dangerous versions. This could lead to a better understanding of exactly how the bacteria causes damage, and eventually, more effective treatments that could significantly lower the death rate for diarrheal diseases, which are a leading cause of child mortality around the world. It is also is a leading cause of malnutrition in children under five years old.

Comment by Dr. Krishna Kumari Challa on February 6, 2016 at 11:26am

An interesting observation about common people's grasp of the words "Antibiotic Resistance".
Researchers found that most people, if they had heard of antibiotic resistance at all, thought that it was their body which becomes resistant to antibiotics, rather than the bacteria that cause drug-resistant infections. This misconception often makes people feel like antibiotic resistance is someone else's problem!

The misconception could help to explain why many people who are prescribed antibiotics fail to complete the course, believing that this will prevent their bodies from becoming resistant!!

So experts are recommending that  “doctors, the media and other communicators talk about ‘drug-resistant infections’ or ‘antibiotic-resistant germs’, rather than ‘antibiotic resistance’. This makes it easier to understand that it is bacteria that acquire resistance, not people's bodies".

Comment by Dr. Krishna Kumari Challa on February 6, 2016 at 11:20am

Mothers who are obese during pregnancy have almost twice the odds of having a child with autism as women who weigh less, a U.S. study suggests.
When women are both obese and have diabetes, the autism risk for their child is at least quadrupled, researchers reported online January 29 in Pediatrics.

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Comment by Dr. Krishna Kumari Challa on February 4, 2016 at 7:06am

Model of Sun's magnetic field:

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