Knowledge Update | Horizon University UAE – Essential Insights

New York, May 6 (IANS) A team of astronomers has for the first time derived a highly precise measurement of the mass of a black hole -- calculating its mass to be 660 million times greater than that of the Sun.

Working with high-resolution data from the Atacama Large Millimetre/submillimetre Array in Chile, the scientists determined the speed of a disk of cold molecular gas and dust orbiting the supermassive black hole at the heart of a nearby giant elliptical galaxy named "NGC 1332".

"This is the first time that ALMA has probed the orbital motion of cold molecular gas well inside the gravitational sphere of influence of a supermassive black hole," said Aaron Barth, professor of physics and astronomy from the University of California-Irvine.

"We're directly viewing the region where the cold gas is responding to the black hole's gravitational pull. This is an exciting milestone for ALMA and a great demonstration of its high-resolution capability," added Barth in a paper appeared in the Astrophysical Journal Letters. 

To calculate the mass of a black hole in a galaxy's centre, astronomers must be able to measure the speed of something orbiting around it.

Barth and his group trained ALMA's observational powers on NGC 1332, a giant elliptical galaxy in the southern sky 73 million light-years from the Earth.

Elliptical galaxies are known to contain massive central black holes.

About one in 10 elliptical galaxies contain disks of cold molecular gas and dust that orbit their centres. 

In visible light, as seen by the Hubble Space Telescope, these disks appear as dark silhouettes against the bright background of starlight in a galaxy's core. 

But ALMA can observe radio-wavelength light emitted by molecules in these structures. 

In this case, Barth's team focused on radio-wave emissions from carbon monoxide (CO) molecules as the CO signal is bright and readily detected with ALMA.

By mapping the disk's rotation with the high-resolution data, Barth's group determined that the black hole in NGC 1332 has a mass that is 660 million times greater than the Sun -- with a measurement uncertainty of just 10 percent. 

This is among the most precise measurements for the mass of a galaxy's central black hole.

"This observation demonstrates a technique that can be applied to many other galaxies to measure the masses of supermassive black holes to remarkable precision," added study co-author Benjamin Boizelle.

The findings can help shed light on how galaxies and their supermassive black holes.

The team included astronomers from the University of California, Irvine, University of Colorado, Rutgers University, the Kavli Institute for Astronomy and Astrophysics at Peking University in Beijing, China, and Texas A&M University.​

​London, May 4 (IANS) Taking at least 2-3 minutes rest between weight-lifting sets at the gym can help boost muscle growth, British researchers have found.

The results suggest that guys who took longer rest periods showed two-fold increase in myofibrillar protein synthesis (MPS) -- associated with strength and muscle growth.

The study highlights that short rest intervals may actually impair the processes that control muscle growth.

However, with short rests of one minute, the actual muscle response is blunted. 

“If you're looking for maximised muscle growth with your training programme, a slightly longer interval between sets may provide a better chance of having the muscle response you're looking for," said Leigh Breen from University of Birmingham in Britain.

The study, published in the journal Experimental Physiology, analysed 16 men who completed resistance exercises interspersed by either one minute or five minutes of rest. 

Muscle biopsies were obtained at 0, four, 24 and 28 hours post-exercise. 

Beginners starting out on weight training programmes should take sufficient rest, of at least 2-3 minutes, between weight lifting sets that can help with muscle growth, the authors recommended.

For experienced lifters, it's possible that they may not experience the same blunted muscle building response to short rest intervals particularly if they have trained this way for a prolonged period and adapted to this unique metabolic stress. 

"Nonetheless, similar recommendations of 2-3 minutes between sets should help ensure maximal muscle growth in well-trained individuals,” Breen added.​

London, May 5 (IANS) Long-eared bats are assisted in flight by their ears and body, say scientists, adding that this knowledge into the bats' flying technique can help develop better drones.

Contrary to what researchers previously assumed, Christoffer Johansson Westheim and his colleagues from Lund University in Sweden show that long-eared bats are helped in flight by their large ears.

They show how the air behind the body of a long-eared bat accelerates downwards, which means that the body and ears provide lift.

“This distinguishes the long-eared bats from other species that have been studied and indicates that the large ears do not merely create strong resistance, but also assist the animal in staying aloft", said Westheim.

The findings also highlight the evolutionary conflict between flying as efficiently as possible and eco-locating - discovering objects by sending out soundwaves and perceiving the resulting echoes.

Another discovery made during the experiments and never previously described in research is how the bats generate forward motion when flying slowly.

The forward motion is generated when the wings are held high and away from the body at the end of each beat.

"This specific way of generating power could lead to new aerodynamic control mechanisms for drones in the future, inspired by flying animals", Westheim added in a university statement.

The experiments were conducted in a wind tunnel in which trained bats flew through thin smoke to reach a stick with food on it.

Meanwhile the researchers aimed a laser beam at the smoke behind the bats and took pictures of the illuminated smoke particles.

The researchers then measured how the smoke moved to calculate the forces generated by each beat of the bats' wings.​

​New York, May 5 (IANS) Consuming grapes combined with a diet rich in saturated fats can lower obesity risk as well as improve gut bacteria, a new study has found.

According to researchers, it may also help counter the negative effects of a high fat diet, including heart disease, hypertension and diabetes.

The findings showed that the unique and diverse composition of antioxidants called polyphenols present in grapes can help reduce the percentage of body fat, subcutaneous and visceral fat deposits, markers of inflammation in the liver and improve glucose tolerance.

Further, it also increased microbial diversity and decreased abundance of several deleterious bacteria in the intestinal tract.

The research, published in the Journal of Nutritional Biochemistry, is based on two laboratory studies.

In the first study, intake of a diet high in fat content (33 percent of energy from fat) and enriched with 3 percent grapes for 11 weeks, showed a lower percentage of overall body fat and reduced subcutaneous fat deposits.

In the second study, which ran for 16 weeks, the researchers used an even higher fat diet (44 percent of energy from fat) with multiple types of saturated fat, including lard, beef tallow, shortening, and butter similar to some Western-type diets.

"These two studies suggest that grapes and grape polyphenols may help offset a number of the adverse effects of consuming a high fat diet and trigger improvements in intestinal or systemic health," said lead researcher Michael McIntosh from the University of North Carolina in the US.

The researchers investigated the impact of the high fat diet enriched with extracts of either the polyphenol fraction of grapes or the non-polyphenol portion of grapes, as well as the high fat diet plus five percent whole grapes.

All the high fat experimental diets were matched for sugar type and amount.​

London, May 5 (IANS) Viral respiratory tract infections -- like the common cold, flu, tonsillitis, bronchitis and pneumonia -- during the first six months of life are likely to increase the risk for Type-1 diabetes in children, says a new study.

The findings suggest that the first half-year of life is crucial for the development of the immune system and of autoimmune diseases such as Type-1 diabetes (T1D).

According to researchers, T1D risk increased in children who had a respiratory tract infection between birth and 2.9 months or between three and 5.9 months of age compared with children who had no respiratory tract infections in these age intervals.

"Our findings show that viral respiratory tract disorders during the first six months of life significantly increase the risk of children developing Type-1 diabetes," said one of the researchers, Andreas Beyerlein, from Helmholtz Zentrum Munchen in Germany.

Infants are particularly susceptible to respiratory tract infections like the common cold, flu, tonsillitis, bronchitis and pneumonia, because, unlike adults, their immune systems have not acquired the immunity to stave off some of the viruses that cause them.

The study included 295,420 infants, of whom 720 were diagnosed with T1D over a median follow-up of 8.5 years, for an incidence of 29 diagnoses per 100,000 children annually. 

At least one infection was reported during the first two years of life in 93 percent of all children, and in 97 percent of children with T1D.

Most children experienced respiratory and viral infections. 

T1D risk was also found increased among children who experienced a viral infection between birth and 5.9 months of age.

The study was published in the journal JAMA.​

​London, May 5 (IANS) Studying a nearby star has given scientists a fascinating insight into how the Sun may have behaved billions of years ago.

A team of international astronomers, including professor Stefan Kraus of the University of Exeter in Britain, used cutting-edge techniques to create the first direct image of surface structures on the star Zeta Andromedae - found 181 light years from Earth.

In order to image the star's surface during one of its 18-day rotations, the researchers used a method called interferometry where the light of physically separate telescopes is combined in order to create the resolving power of a 330m telescope.

Found in the northern constellation of Andromeda, the star showed signs of “starspots” - the equivalent of sunspots found within our own solar system. The pattern of these spots differs significantly from those found on the Sun.

The researchers suggest these results challenge current understandings of how magnetic fields of stars influence their evolution.

Furthermore, they believe that the findings offer a rare glimpse of how the Sun behaved in its infancy, while the solar system was first forming.

“Most stars behave like giant rotating magnets and 'starspots' are the visible manifestation of this magnetic activity. Imaging these structures can help us to decipher the workings that take place deep below the stellar surface,” said Kraus.

“While imaging sunspots was one of the first things that astronomer Galileo Galilei did when he started using the newly-invented telescope, it has taken more than 400 years for us to make a powerful enough telescope that can image spots on stars beyond the Sun," added John Monnier, professor of astronomy in University of Michigan.

It's important to understand the Sun's history because that dictates the Earth's history -- its formation and the development of life.

“The better we can constrain the conditions of the solar environment when life formed, the better we can understand the requirements necessary for the formation of life,” said Rachael Roettenbacher, who conducted this research as part of her doctoral thesis at University of Michigan.

The findings were published in the scientific journal Nature.​

Washington, May 5 (IANS) A team of US doctors has shown for the first time that soft tissue surgery can soon be performed entirely by a robot on humans, putting surgery one step closer into the realm of intelligent machines.

The so-called Smart Tissue Autonomous Robot (STAR) succeeded in suturing and reconnecting bowel segments in living pigs -- a procedure known as intestinal anastomosis -- and all the animals survived with no complications.

The STAR robotic sutures were compared with the work of five surgeons completing the same procedure using three methods -- open, laparoscopic and robot-assisted surgery with the well-known da Vinci Surgical System.

The robot's time was longer than open and robot-assisted surgery but comparable to the laparoscopic procedure. The robotic procedure lasted 35 to 57 minutes, while the open surgery took eight minutes.

​Washington, May 5 (IANS) Pluto behaves less like a comet than expected and somewhat more like a planet like Mars or Venus in the way it interacts with the solar wind -- a continuous stream of charged particles from the Sun, a first ever analysis has revealed.

Using data from the New Horizons flyby of Pluto last year, scientists have observed the material coming off of Pluto's atmosphere and studied how it interacts with the solar wind, leading to yet another "Pluto surprise".

"This is a type of interaction we've never seen before anywhere in our solar system," said David J. McComas, professor of astrophysical sciences at the Princeton University.

According to space physicists, they now have a treasure trove of information about how Pluto's atmosphere interacts with the solar wind.

Solar wind is the plasma that spews from the Sun into the solar system at a supersonic 160 million km per hour, bathing planets, asteroids, comets and interplanetary space in a soup of mostly protons and electrons.

Previously, most researchers thought that Pluto was characterised more like a comet which has a large region of gentle slowing of the solar wind as opposed to the abrupt diversion solar wind encounters at a planet like Mars or Venus.

Instead, like a car that is part gas-and part battery-powered, Pluto is a hybrid, researchers said.

"These results speak to the power of exploration. Once again we've gone to a new kind of place and found ourselves discovering entirely new kinds of expressions in nature," added Alan Stern, New Horizons' principal investigator.

Since it is so far from the Sun, scientists thought Pluto's gravity would not be strong enough to hold heavy ions in its extended atmosphere.

But, "Pluto's gravity clearly is enough to keep material relatively confined", McComas noted.

Like the Earth, Pluto has a long ion tail that extends downwind at least a distance of about 118,700 km, almost three times the circumference of the Earth, loaded with heavy ions from the atmosphere and with "considerable structure".

The findings, published in the Journal of Geophysical Research-Space Physics offer clues to the magnetised plasmas that one may find around other stars.​

Kuala Lumpur, May 5 (IANS) Social media giant Facebook has opened a local office in the Malaysian capital of Kuala Lumpur, a media report said on Thursday.

"The office launch marks a milestone for Facebook in Malaysia and we are committed to helping Malaysians and businesses connect in more meaningful ways," said Facebook

​London, May 5 (IANS) Large meteorite and comet impacts in the sea created structures that provided conditions favourable for life on Earth, reveal geochemists from Trinity College Dublin in Ireland.

Water then interacted with impact-heated rock to enable synthesis of complex organic molecules and the enclosed crater itself was a microhabitat within which life could flourish, said the team.

It has long been suggested that the meteoritic and cometary material that bombarded early Earth delivered the raw materials - complex organic molecules and water - and the energy that was required for synthesis. 

According to the researchers, impact craters were ideal environments to facilitate the reactions that saw the first “seeds of life” take root.

“The findings suggest that extensive hydrothermal systems operated in an enclosed impact crater at Sudbury, Ontario, Canada,” said first study author Edel O'Sullivan in a paper published in the journal Geochimica et Cosmochimica Acta.

The Sudbury basin provides a unique opportunity to study the sediment that filled the basin as a guide to what the earlier impact craters would have looked like. 

The Sudbury structure has an unusually thick basin fill and much of this is almost black in colour (due to carbon), also containing hydrothermal metal deposits.

To reach these findings, representative samples across the basin fill were analysed for their chemistry and for carbon isotopes.​