Knowledge Update

Washington, April 20 (IANS) Three solar observatories have captured the most comprehensive observations of an electromagnetic phenomenon called a "current sheet", strengthening the evidence that the understanding of solar flares is correct.

A "current sheet" is a very fast and flat flow of electrically-charged material, defined in part by its extreme thinness compared to its length and width.

"Current sheets" form when two oppositely-aligned magnetic fields come in close contact, creating very high magnetic pressure.

The multi-faceted view of the December 2013 flare was made possible by three solar-watching missions: NASA's Solar Dynamics Observatory (SDO), NASA's Solar and Terrestrial Relations Observatory (STEREO) and Hinode, a collaboration between the space agencies of Japan, the US, Britain and Europe.

Solar flares are intense bursts of light from the sun. They are created when complicated magnetic fields suddenly and explosively rearrange themselves, converting magnetic energy into light.

"The existence of a 'current sheet' is crucial in all our models of solar flares," said James McAteer, astrophysicist at New Mexico State University.

"These observations make us much more comfortable that our models are good," he added.

The strongest solar flares can impact the Earth's atmosphere and interfere with our communications systems and also disrupt onboard satellite electronics.

Unlike other space weather events, solar flares travel at the speed of light, meaning we get no warning that they are coming.

Better models lead to better forecasting, said Michael Kirk, space scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland.

"These complementary observations allowed unprecedented measurements of magnetic reconnection in three dimensions. This will help refine how we model and predict the evolution of solar flares," Kirk added.

Because "current sheets" are so closely associated with magnetic reconnection, observing a "current sheet" in such detail backs up the idea that magnetic reconnection is the force behind solar flares.

"You have to be watching at the right time, at the right angle, with the right instruments to see a current sheet," said McAteer in the study published in the Astrophysical Journal Letters.

The new study is unique in that several measurements of the current sheet -- such as speed, temperature, density and size -- were observed from more than one angle or derived from more than method.​

​London, April 20 (IANS) As the world gets prepared to build smart cities, new research led by an Indian-origin scientist has highlighted the dangerous effects of indoor pollution on human health and has called for policies to ensure closer monitoring of air quality.

According to Prashant Kumar from the University of Surrey, the research offers insight into "Sick Building Syndrome" and how new smart cities could help combat air quality issues.

When we think of the term "air pollution", we tend to think of car exhausts or factory fumes expelling grey smoke.

"However, there are actually various sources of pollution that have a negative effect on air quality, many of which are found inside our homes and offices. From cooking residue to paints, varnishes and fungal spores the air we breathe indoors is often more polluted than that outside," explained Kumar.

In 2012, indoor air pollution was linked to 4.3 million deaths globally, compared with 3.7 million for outdoor air pollution.

Urban dwellers typically spend 90 percent of their time indoors and this has been linked to "Sick Building Syndrome" where people exhibit a range of ill-health effects related to breathing indoor air.

"It is essential that we are able to effectively monitor indoor air pollution so that we can better understand when and where levels are worst, and in turn offer solutions to make our air healthier," added Kumar in the journal Science of the Total Environment.

"Our work looks at the use of small, low-energy monitoring sensors that would be able to gather real-time data and tell families or workers when levels of pollutants are too high," he continued.

With this research, we are calling for greater importance to be placed on ensuring buildings are built with indoor pollution monitoring in mind. As we enter the age of smart cities this is one way in which technology will actively benefit health, the authors noted.

A collaborative effort of European, Australian and British researchers led by the University of Surrey, the study assesses the harmful effects of indoor pollution in order to make recommendations on how best to monitor and negate these outcomes.

In another paper published earlier in the journal Environmental Pollution, Kumar and PhD student Anju Goel also found that outdoor air pollution was at a high where buildings were located at traffic intersections.

Even where there was low traffic volume, traffic intersections with densely built up surroundings showed twice the concentration than at open junctions.

Exposure to these concentrations showed that ground floor dwellings in these areas were exposed to twice as many harmful particles.

"This has important implications for town planning and we should consider whether we really want schools, offices or hospitals to be built within these environments," Kumar noted.​

​New York, April 20 (IANS) Using the low-tech material coal, engineers from the Massachusetts Institute of Technology (MIT) have built a simple electrical heating device that can be used for defrosting car windows or airplane wings or as part of a biomedical implant.

They have also for the first time characterised in detail the chemical, electrical and optical properties of thin films of four different kinds of coal - anthracite, lignite, and two bituminous types. 

“When you look at coal as a material and not just as something to burn, the chemistry is extremely rich," said lead researcher Jeffrey Grossman from the Department of Materials Science and Engineering (DMSE) at MIT. 

The question he wanted to ask is: "Could we leverage the wealth of chemistry in things like coal to make devices that have useful functionality?" 

The answer, he says, is a resounding yes.

Part of the challenge was to figure out how to process coal.

The researchers developed a series of steps to crush the material to a powder put it in solution then deposit it in thin uniform films on a substrate -- a necessary step in fabricating many electronic devices - from transistors to photovoltaics.

Even though coal has been one of the most widely used substances by human beings for centuries, its bulk electronic and optical properties had never really been studied for the purpose of advanced devices.

The simple heating device the team made provides an end-to-end demonstration of how to use the material - from grinding the coal to depositing it as a thin film and making it into a functional electronic device. 

The doors are now opened for a wide variety of potential applications through further research.

The big potential advantage of the new material, Grossman says, is its low cost stemming from the inherently cheap base material, combined with simple solution processing that enables low fabrication costs. 

The findings were reported in the journal Nano Letters.​

​London, April 20 (IANS) Savouring positive memories and images is likely to generate positive emotions in the human mind and can prove to be effective in treating individuals with anxiety or depression, reveals a new research.

A team of researchers from University of Liverpool investigated individuals' emotional reactions using a social technique called social broad-minded affective coping (BMAC) technique -- an intervention that aims to elicit positive affect or emotion through the use of mental imagery of a positive memory. 

"The findings suggest that the BMAC has the potential to be a practical and effective method for boosting mood amongst individuals with specific mental health problems such as anxiety or depression," said lead researcher Peter Taylor from University of Liverpool in Britain.

The findings showed that following the social BMAC, the participants showed an increase in feelings of social safeness, warm positive affect and relaxed positive affect, whilst the negativity decreased.

The results, which provide preliminary support for the effectiveness of the social BMAC in activating specific types of emotion, have been detailed in the journal Psychology and Psychotherapy: Theory, Research and Practice.

As part of the study 123 participants, recruited online, completed self-report measures of self-attacking (thinking mean, diminishing, insulting, and shaming thoughts about oneself), social safeness (feelings of warmth and connectedness) and pleasure.

The participants were encouraged to engage all the senses, think about the meaning of the memory to them, savour the positive feelings they experienced, and consider the positive feelings in the mind of another before reflecting upon the feelings they experience as well as what this means to them. 

Participants completed state measures of positive and negative affect and social safeness/pleasure before and after the intervention.​

London, April 20 (IANS) Human limbs share a genetic programme with the respiratory organs of fishes such as sharks and skates, reveals a new research, providing evidence to support a century-old, widely discounted theory on the origin of limbs.

German anatomist Karl Gegenbaur, in 1878, first proposed the theory that human limbs were evolved from gills -- respiratory organs of sharks and skates. 

These fishes have a series of skin flaps -- that protect their gills -- and are supported by arches of cartilage -- a connective tissue found joints between bones -- with finger-like appendages called branchial rays attached to them.Investigation into the embryos of the little skates -- cartilaginous fishes -- revealed striking similarities between the genetic mechanisms used in the development of its gill arches and those in human limbs.

The researchers found 'sonic hedgehog' -- a critical gene in limb development -- performing the same two functions in the development of gill arches and branchial rays in skate embryos as it does in the development of limbs in mammal embryos.In mammal embryos, the Sonic hedgehog gene sets up the axis of the limb in the early stages of development. 

In human limb development, it dictates the identity of each finger and maintains the growth of the limb skeleton.In the later stages of development, Sonic hedgehog maintains outgrowth so that the limb grows to its full size."In a hand, for instance, Sonic hedgehog tells the limb which side will be the thumb and which side will be the pinky finger," said Andrew Gillis from the University of Cambridge in Britain. 

The study, detailed in the journal Development, provides greater understanding of the origin of jawed vertebrates -- the group of animals that includes humans.

"Gegenbaur looked at the way that these branchial rays connect to the gill arches and noticed that it looks very similar to the way that the fin and limb skeleton articulates with the shoulder," Gillis explained.​

Washington, April 20 (IANS) March was the 11th consecutive month a monthly global temperature record was broken, the longest such streak since record-keeping began in 1880, the US National Oceanic and Atmospheric Administration (NOAA) has said.

"At the risk of sounding like a broken record, March set another heat record for the globe," Xinhua quoted the NOAA as saying in a statement on Tuesday.

"As Earth continues to warm and is influenced by phenomena such as El Nino, global temperature records are piling up."

For March, the average temperature across global land and ocean surfaces was 1.22 degrees Celsius above the 20th century average of 12.7 degrees Celsius, according to the NOAA monthly report.

This was not only the highest for the month of March in the 1880-2016 record, but also the highest monthly temperature departure among all months on record, surpassing the previous all-time record set last month by 0.01 degrees Celsius.

Most of the Earth's land surfaces were warmer or much warmer than average in March, said the report, with record warmth notable across eastern Brazil, most of eastern and central Africa, much of southeastern Asia, and large portions of northern and eastern Australia.

Most of northwestern Canada and Alaska, along with vast regions of northern and western Asia, observed temperatures at least three degrees Celsius above their 1981-2010 average.

The weather phenomenon called El Nino continued to weaken in the central and eastern Pacific Ocean during March, but the month globally averaged sea surface temperature remained 0.81 degrees Celsius above the 20th century monthly average, also a record high.

In total, "the six highest monthly global ocean temperature departures have all occurred in the past six months," the report said.

For the first three months in 2016, the average temperature for the globe was 1.50 degrees Celsius above the 20th-century average.

This was also the highest temperature for this period in the 1880-2016 record, surpassing the previous record set in 2015 by 0.28 degrees Celsius.​

​London, April 20 (IANS) Shakespeare is more popular globally than with people in Britain though the bard has made a significant contribution to Britain's economy and culture, a new research revealed on Tuesday.

According to a new survey "All the World's", commissioned by the British Council and conducted by YouGov, the great playwright has been proved more popular outside Britain (65 percent) than in his own country (59 percent), Xinhua reported.

A total of 18,000 respondents in 15 countries participated in the survey in November 2015. Survey showed only 59 percent British people like Shakespeare, while 68 percent Chinese respondents like him.

The top five countries "like Shakespeare" are India (89 percent) , Mexico (88 percent), Brazil (87 percent), Turkey (79 percent) and South Africa (73 percent). Scores of France and Germany were the lowest, with 51 percent and 44 percent, respectively.

The survey also revealed that 84 percent of Brazilians said they found him relevant to today's world, compared with 57 percent in Britain. Meanwhile, 83 percent of Indian respondents said they understood Shakespeare, however, in Britain, only 58 percent of respondents said so.

Contributable factors for the results included Shakespeare's works being translated into more contemporary editions and adaptation into other formats, said British Council.

This new research also underlined the continued importance and relevance of Shakespeare in the 21st century. Over a third of those questioned said Shakespeare made them feel more positive about Britain in general.

Previous research conducted by the British Council in 2014 showed that Shakespeare was the leading personality that 18 to 34 year olds in Brazil, China, Germany, India and the US most identified with contemporary British arts and culture.​

​New York, April 12 (IANS) Scientists have created a new, low-cost approach to build a knee model for studying knee pain and impaired mobility.

The reconstructed knee model closely simulates the movement of the patella (kneecap) observed in cadaver knee models. 

Because the kneecap acts like a shield for knee joint, it can easily be broken. Falling directly onto the knee is a common cause of patellar fractures. 

Researchers Gian Luca Gervasi, Roberto Tiribuzi and a team from the University of Ioannina, Greece and Giuliano Cerulli from Università Cattolica del Sacro Cuore in Italy used a motion tracking system to measure the position of the patella as different loads and forces were applied to the knee model at various degrees of flexion.

They used magnetic resonance imaging (MRI) scans of a real knee to develop the computer-aided design software files used by a 3D printer to create the three main components of the knee and a navigation system for combining them with artificial ligaments and a tendon.

The team presented the results of static experiments in the study published in the journal 3D Printing and Additive Manufacturing.​

​New York, April 20 (IANS) The presence of certain bacteria in the mouth is likely to identify the risk for pancreatic cancer and enable earlier and precise treatment in patients, finds new research.

Pancreatic cancer patients are known to be vulnerable to gum disease, cavities, and poor oral health in general, said the team from New York University.

The findings showed that bacterial changes in the mouth could potentially show us who are at the risk of developing pancreatic cancer.

"Our study offers the first direct evidence that specific changes in the microbial mix in the mouth represent a likely risk factor for pancreatic cancer along with older age, male gender, smoking and a family history of the disease," said one of the researchers Jiyoung Ahn, associate professor and epidemiologist.

Men and women whose oral microbiomes included Porphyromonas gingivalis - an anaerobic bacteria -- had an overall 59 percent greater risk of developing pancreatic cancer than those whose microbiomes did not contain the bacterium. 

Similarly, people whose oral microbiomes contained Aggregatibacter actinomycetemcomitans -- bacteria often found in association with periodontitis -- were at least 50 percent more likely overall to develop the disease. 

Both types of bacteria have been tied to diseases such as periodontitis or inflammation of the gums.

According to previous research, cigarette smoking was also linked to changes in the amount and mix of bacteria in the oral microbiome. 

For the study, the researchers compared bacterial contents in mouthwash samples from 361 men and women who developed pancreatic cancer with samples from 371 people of similar age who did not. 

The team cautioned that further research is needed to determine if there is any cause-and-effect relationship.

The findings were recently presented at the annual meeting of the American Association for Cancer Research held in New Orleans, US.​

Washington, April 12 (IANS) A team of scientists has developed a new refined tool to search for exoplanets orbiting distant stars or other planetary detections.

One of the most successful techniques to find and confirm planets is called the radial velocity method.

A planet is obviously influenced by the gravity of the star it orbits; that's what keeps it in orbit.

This technique takes advantage of the fact that the planet's gravity also affects the star in return.

As a result, astronomers are able to detect the tiny wobbles the planet induces as its gravity tugs on the star. Using this method, astronomers have detected hundreds of exoplanets.

For certain kinds of low-mass stars, there are limitations to the standard radial velocity method that may find something that looks like a planet but is not.

To address this issue, the team from Carnegie Mellon University, California Institute of Technology (Caltech) and Missouri State University decided to use the radial velocity technique but they examined a different, longer wavelength of light.

"Switching from the visible spectrum to the near-infrared, the wobble effect caused by an orbiting planet will remain the same regardless of wavelength," explained Jonathan Gagne from Carnegie.

But looking in the near-infrared will allow us to reject false positives caused by sunspots and other phenomena that will not look the same in near-infrared as they do in visible light, he added.

The research team was able to develop a better calibration tool to improve the overall technology for near-infrared radial velocity work which should make it a better option going forward.

They examined 32 low-mass stars using this technological upgrade att he NASA Infrared Telescope Facility atop Mauna Kea in Hawaii.

The findings confirmed several known planets and binary systems and also identified a few new planetary candidates.

“Our results indicate that this planet-hunting tool is precise and should be a part of the mix of approaches used by astronomers going forward,” added Caltech's Peter Gao in a paper published in The Astrophysical Journal.​