Knowledge Update

​New York, Oct 15 (IANS) A team of researchers has developed a smartwatch prototype that uses the wrist wearing the watch as an always-available joystick to perform touchscreen gestures with one-handed continuous input.

Checking email, tracking fitness and listening to music, are just a few things that a smartwatch can do but what if your hands aren't free? 

WristWhirl is the answer.

While other studies have explored the use of one-handed continuous gestures using smartwatches, WristWhirl is the first to explore gestural input.

"This shows what smartwatches may be able to do in the future, by allowing users to interact with the device using one hand (the one that the watch is worn on) while freeing up the other hand for other tasks," said Xing-Dong Yang, assistant professor of computer science at Dartmouth College.

To develop the WristWhirl prototype, researchers investigated the biomechanical ability of the wrist by tasking a small group of participants to conduct eight joystick-like gestures while standing and walking.

Participants wore the watch on their left wrist and were asked to use their wrist to make four directional marks similar to flicking a touch screen, and four free-form shapes, such as a triangle.

They were asked to make these gestures with their hand-up in front of their body during which they could see the gesture being drawn on the watch's screen, and with their hand-down alongside their body.

They were able to make directional marks at an average rate of half a second and free-form shapes at an average rate of approximately 1.5 seconds.

WristWhirl was built from a 2-inch TFT display and a plastic watch strap augmented with 12 infrared proximity sensors and a Piezo vibration sensor placed inside the wrist strap.

The project will be presented at the ACM Symposium on User Interface Software and Technology in Tokyo on October 19.

​Washington, Oct 15 (IANS) Mission managers for Juno probe to Jupiter have decided to delay the upcoming burn of its main rocket motor - designed to put the spacecraft closer to the largest planet in our solar system - until December, the US space agency said on Saturday.

The decision was made in order to further study the performance of a set of valves that are part of the spacecraft's fuel pressurisation system.

This burn, originally scheduled for October 19, called the period reduction maneuver (PRM), was to reduce Juno's orbital period around Jupiter from 53.4 to 14 days. 

"It is important to note that the orbital period does not affect the quality of the science that takes place during one of Juno's close flybys of Jupiter," said Scott Bolton, principal investigator of Juno from the Southwest Research Institute in San Antonio. 

"The mission is very flexible that way. The data we collected during our first flyby on August 27th was a revelation, and I fully anticipate a similar result from Juno's October 19th flyby," Bolton noted.

The most efficient time to perform such a burn is when the spacecraft is at the part of its orbit which is closest to the planet. 

The next opportunity for the burn would be during its close flyby of Jupiter on December 11, NASA said.

Mission designers had originally planned to limit the number of science instruments on during Juno's October 19 close flyby of Jupiter. 

Now, with the period reduction maneuver postponed, all of the spacecraft's science instruments will be gathering data during the upcoming flyby.

The Juno spacecraft launched on August 5, 2011, from Cape Canaveral, Florida, and arrived at Jupiter on July 4, 2016.

New York, Oct 14 (IANS) US stocks traded lower as Wall Street continued to digest the Federal Reserve's minutes from its September meeting.

The Dow Jones Industrial Average on Thursday dipped 120.18 points, or 0.66 per cent, to 18,024.02, Xinhua news agency reported.

​New York, Oct 14 (IANS) To give users even more ways to watch, Facebook has rolled out the ability to stream videos from the social network to your TV through devices like Apple TV or Google Chromecast.

​Brasilia, Oct 14 (IANS) Brazilian President Michel Temer will leave on Friday to India to participate in the eighth Brics Summit and then to Japan to attract investment.

According to Temer's spokesperson, Alexandre Parola, on Thursday, the President's Asia visit will be an opportunity for the government to show "a new Brazil" of "investment

​New York, Oct 14 (IANS) Combining the tools of Big Data analysis and visualisation with the vast amounts of data generated by social media, a group of scientists from Indiana University has started to tackle new areas of health research.

New York, Oct 14 (IANS) Men with prostate cancer who are treated with testosterone-lowering drugs are twice as likely to develop dementia within five years as compared to prostate cancer patients whose testosterone levels are not tampered with, say researchers including one of Indian-origin.

"The risk is real and, depending on the prior dementia history of the patient, we may want to consider alternative treatment," said senior author of the study Nigam Shah, Associate Professor at Stanford University School of Medicine.

Testosterone can promote the growth of prostate tumors, and so clinicians have used androgen deprivation therapy (ADT) to lower testosterone and other androgens in prostate cancer patients since the 1940s.

The team looked at records from Stanford Medicine's clinical-research data warehouse for nearly 10,000 patients with prostate cancer. 

Of the 1,829 who received androgen deprivation therapy, 7.9 percent developed dementia within five years, compared with 3.5 percent of those not treated with androgen deprivation therapy, said the study published in the journal JAMA Oncology.

The researchers, however, cautioned that prostate cancer patients who are receiving ADT should not make changes to their medications without talking to their physicians.

The new retrospective study of patient records took only a few weeks, Shah said. 

But retrospective studies of patient medical records are not meant to replace randomised clinical trials, he added.

New York, Oct 14 (IANS) Offering new hope for an alternative treatment of brain cancer, researchers have found that depriving the deadly tumour cells of cholesterol, which they import from neighbouring healthy cells, kills tumour cells and causes their regression.

"Disrupting cholesterol import by GBM (glioblastoma) cells caused dramatic cancer cell death and shrank tumours significantly, prolonging the survival of the mice," said senior author Paul Mischel, Professor at University of California San Diego School of Medicine in the US.

Glioblastoma (GBM) is the most common and most aggressive form of brain cancer, which is extremely difficult to treat. The median survival rate is just over 14 months, with few treated patients living five years or more past diagnosis.

"The strategy worked with every single GBM tumour we looked at and even on other types of tumours that had metastasised to the brain," Mischel noted.

Adult brain cancers are almost universally fatal, in part because of the biochemical composition of the central nervous system (CNS) and the blood-brain barrier, which selectively and protectively limits the passage of molecules from the body into the brain, but which also blocks most existing chemotherapies, contributing to treatment failure.

"Researchers have been thinking about ways to deal with this problem," Mischel said.

In previous research, Mischel and others had noted GBM cells cannot synthesise cholesterol, which is vital to cell structure and function, particularly in the brain. 

Instead, GBM cells derive what they need from brain cells called astrocytes, which produce cholesterol in abundance.

The researchers found that the experimental metabolic disease drug candidate named LXR-623 can help disrupt cholesterol import by GBM cells in mice.

The study published online in the journal Cancer Cell found no effect of the treatment upon healthy neurons and other brain cells, but GBM cells were deprived of vital cholesterol, resulting in cell death and tumour regression.

Mischel suggested the GBM strategy could be implemented in clinical trials using drug-candidates under development or in early trials.

​Washington, Oct 14 (IANS) There are at least 10 times more galaxies in the observable universe than previously thought, said astronomers.

One of the most fundamental questions in astronomy is that of just how many galaxies the universe contains, and astronomers earlier estimated that the observable universe contained about 200 billion galaxies.

The new research - to be published in The Astrophysical Journal -- shows that this estimate is at least 10 times too low.

The researchers led by Christopher Conselice of University of Nottingham in Britain reached this conclusion using deep-space images from NASA's Hubble space telescope and the already published data from other teams. 

They converted the images into 3-D, in order to make accurate measurements of the number of galaxies at different epochs in the universe's history. 

In addition, they used new mathematical models, which allowed them to infer the existence of galaxies that the current generation of telescopes cannot observe. 

This led to the surprising conclusion that in order for the numbers of galaxies we now see and their masses to add up, there must be a further 90 per cent of galaxies in the observable universe that are too faint and too far away to be seen with present-day telescopes. 

These myriad small faint galaxies from the early universe merged over time into the larger galaxies we can now observe.

"It boggles the mind that over 90 per cent of the galaxies in the universe have yet to be studied. Who knows what interesting properties we will find when we discover these galaxies with future generations of telescopes? In the near future, the James Webb Space Telescope will be able to study these ultra-faint galaxies," Conselice said.

"These results are powerful evidence that a significant galaxy evolution has taken place throughout the universe's history, which dramatically reduced the number of galaxies through mergers between them - thus reducing their total number," Conselice explained.

The decreasing number of galaxies as time progresses also contributes to the solution for Olbers' paradox (first formulated in the early 1800s by German astronomer Heinrich Wilhelm Olbers): Why is the sky dark at night if the universe contains an infinity of stars? 

The team came to the conclusion that indeed there actually is such an abundance of galaxies that, in principle, every patch in the sky contains part of a galaxy.

However, starlight from the galaxies is invisible to the human eye and most modern telescopes due to other known factors that reduce visible and ultraviolet light in the universe.

Those factors are the reddening of light due to the expansion of space, the universe's dynamic nature, and the absorption of light by intergalactic dust and gas. 

All combined, this keeps the night sky dark to our vision, the researchers said.

Wellington, Oct 14 (IANS) Vitamins A and C could improve the conversion of adult cells into stem cells, opening the way to advances in biomedical treatments for human diseases, according to a New Zealand-led study released on Friday.

The research team discovered that the two vitamins complemented each other in erasing "memory" associated with DNA, an important effect for improving technologies geared towards regenerative medicine and stem cell therapy, Xinhua news agency reported.

Ordinary adult cells, such as those in the skin or blood, could be artificially coerced in a culture dish to resemble embryos only a few days old, said study co-author Tim Hore of the University of Otago.

Since the 2006 discovery that reprogramming was possible, there had been much interest in using induced embryonic stem cells to cure human disease.

"However, hampering these efforts is the reality that adult cells are resistant to changes in their identity, partly because of chemical alterations to their DNA," Hore said in a statement.

These alterations, known as "DNA methylation", were acquired during development and provided a form of cellular memory that helped cells faithfully maintain a specialised function.

Removal of this memory was critical in order to create a developmentally potent stem cell, or to change one kind of adult cell to another.

With collaborators in Britain and Germany, Hore determined that adding vitamins A and C to culture dishes removed DNA methylation from embryonic stem cells.

When applied to cells during the reprogramming process, those with the desired "naive" embryonic characteristics were created in much greater numbers, he said.

"We found that both vitamins affect the same family of enzymes which actively remove DNA methylation. It turns out that vitamin A increases the number of these enzymes within the cell and vitamin C enhances their activity," he said.

In addition to regenerative medicine, the work could have implications for other areas of biomedical importance.

Loss of DNA methylation and cellular memory were a hallmark of certain cancers, so a better understanding of how this process occurred could prove significant.