Knowledge Update

​London, April 7 (IANS) Imagine a milk carton sending you an alert on smartphone when its content is about to go out-of-date. This could soon be possible, thanks to the researchers who have fabricated for the first time printed transistors consisting entirely of two-dimensional nano-materials.

The team used standard printing techniques to combine graphene nano-sheets as the electrodes with two other nanomaterials, tungsten diselenide and boron nitride as the channel and separator (two important parts of a transistor) to form an all-printed, all-nano-sheet, working transistor.

This study, published in the journal Science, opens the path for industry, such as ICT and pharmaceutical, to cheaply print a host of electronic devices from solar cells to LEDs with applications from interactive smart food and drug labels to next-generation banknote security and e-passports, the researchers said.

The research could thus unlock the potential for applications such as food packaging that displays a digital countdown to warn you of spoiling, wine labels that alert you when your white wine is at its optimum temperature, or even a window pane that shows the day's forecast. 

"In the future, printed devices will be incorporated into even the most mundane objects such as labels, posters and packaging," said lead researcher Jonathan Coleman, an investigator in AMBER, the materials science research centre hosted in Trinity College, Dublin, Ireland.

"Printed electronic circuitry (constructed from the devices we have created) will allow consumer products to gather, process, display and transmit information: for example, milk cartons could send messages to your phone warning that the milk is about to go out-of-date," Coleman added. 

These 2D materials combine electronic properties with the potential for low-cost production. 

"We believe that 2D nano-materials can compete with the materials currently used for printed electronics. Compared to other materials employed in this field, our 2D nano-materials have the capability to yield more cost effective and higher performance printed devices," Coleman said.

The research shows that conducting, semiconducting and insulating 2D nano-materials can be combined together in complex devices. 

"We felt that it was critically important to focus on printing transistors as they are the electric switches at the heart of modern computing. We believe this work opens the way to print a whole host of devices solely from 2D nano-sheets," Coleman said.

​London, April 6 (IANS) Consuming Marmite -- a tangy British spread -- daily may be good for the brain, as it has been found to increase a chemical messenger associated with healthy brain function, a study has showed. In the study, published in the Journal of Psychopharmacology, participants consuming a teaspoon of Marmite every day for a month, showed a substantial reduction of around 30 per cent in their brain's response to visual stimuli. This beneficial effect may be due to the prevalence of vitamin B12 in Marmite increasing levels of a specific neurotransmitter -- known as GABA -- in the brain, the researchers said. "The high concentration of Vitamin B12 in Marmite is likely to be the primary factor behind results showing a significant reduction in participants' responsiveness to visual stimuli," said Daniel Baker, Lecturer at the University of York in London. GABA inhibits the excitability of neurons in the brain, with the chemical acting to 'turn down the volume' of neural responses in order to regulate the delicate balance of activity needed to maintain a healthy brain. The study suggested that dietary intervention could potentially have long-term effects on brain function. "These results suggest that dietary choices can affect the cortical processes of excitation and inhibition - consistent with increased levels of GABA - that are vital in maintaining a healthy brain," said Anika Smith, from the University of York. Conversely, GABA imbalances are also associated with a variety of neurological disorders. "Since we've found a connection between diet and specific brain processes involving GABA, this research paves the way for further studies looking into how diet could be used as a potential route to understanding this neurotransmitter," Baker said.

The global e-commerce giant Amazon announced on Thursday that it would be opening a new logistics hub in Barcelona that would create hundreds of jobs.

The centre would become the company's sixth logistics hub in Spain, Amazon has four of them in Catalonia, Efe news reported.

The new facility will create some 650 jobs over the next three years.

With the new distribution centre, Amazon seeks to handle its increasing sales volume in Spain, and cover the growing demand experienced by its pan-European logistics network, according to a company statement.

The expansion of its logistics infrastructure will enable Amazon to increase its sales, as well as its capacity to support thousands of small and medium-sized enterprises who sell their products through its third party sellers' web platform, "Amazon Marketplace".

The new hub will cover an area of 30,000 sq.metres, the equivalent of four soccer fields.

The centre is due to be operational by autumn 2017, and will initially hire 200 employees, whose selection process will begin in the coming months.

​Madrid, April 6 (IANS)

​New York, April 6 (IANS) A week after Microsoft announced its Windows 10 Creators Update, the company introduced new privacy tools that will offer customers more transparency and control.

​New York, April 6 (IANS) Eating potassium-rich foods like sweet potatoes, avocados, spinach, beans, bananas -- and even drinking coffee -- could be key to lowering blood pressure, new research suggests.

"Decreasing sodium intake is a well-established way to lower blood pressure, but evidence suggests that increasing dietary potassium may have an equally important effect on hypertension," said Alicia McDonough, Professor at the Keck School of Medicine of the University of Southern California (USC).

Hypertension is a global health issue that affects more than one billion people worldwide. The World Health Organization (WHO) estimates that hypertension is responsible for at least 51 per cent of deaths due to stroke and 45 per cent of deaths due to heart disease.

For the study, published in the American Journal of Physiology - Endocrinology and Metabolism, McDonough looked at population, interventional and molecular mechanism studies that investigated the effects of dietary sodium and potassium on hypertension.

The review found several population studies demonstrating that higher dietary potassium (estimated from urinary excretion or dietary recall) was associated with lower blood pressure, regardless of sodium intake. 

Interventional studies with potassium supplementation also suggested that potassium provides a direct benefit.

To understand the beneficial effects of potassium on hypertension, McDonough reviewed recent studies in rodent models.

These studies indicated that the body does a balancing act that uses sodium to maintain close control of potassium levels in the blood, which is critical to normal heart, nerve and muscle function.

"When dietary potassium is high, kidneys excrete more salt and water, which increases potassium excretion," McDonough said.

When dietary potassium is low, the balancing act uses sodium retention to hold onto the limited potassium, which is like eating a higher sodium diet, she said.

But how much dietary potassium should we consume? 

A 2004 Institute of Medicine report recommends that adults consume at least 4.7 grams of potassium per day to lower blood pressure, blunt the effects of dietary sodium and reduce the risks of kidney stones and bone loss, McDonough said.

​Tokyo, April 6 (IANS) Ever wondered why babies love and adore superheroes? It may be because they are born with a sense of justice -- a concept portrayed through the heroic acts of the characters, researchers say.

The findings showed that infants, as young as six months old, who can barely talk, are capable of recognising the heroic acts of justice and thus find themselves drawn to figures who protect the weak. 

This also explains why kids and adults alike have a never-ending love affair with superhero stories in popular culture, the researchers said.

"Six-month-old infants are still in an early developmental stage and most will not yet be able to talk. Nevertheless they can already understand the power dynamics between different characters, suggesting that recognising heroism is perhaps an innate ability," said David Butler from Kyoto University in Japan.

For the study, published in the journal Nature Human Behaviour, the team conducted a series of experiments where infants were shown animations of one geometric character chasing and bumping into another, as a third character watches from a distance. 

In one version, this third party character intervenes, and in another, it escapes in another direction. 

When the infants were then shown real life replicas of these intervening and non-intervening characters, they were more likely to choose the intervener, the researchers said.

"In human society, selflessly protecting the powerless is considered an act of heroic justice," added Yasuhiro Kanakogi from the Kyoto University. 

However, understanding these may be complex as one has to first grasp the power relationship between the actors, then understand that the hero's actions are favourable for the victim but not for the villain, and finally, that the hero acted deliberately, Kanakogi said.

​London, April 5 (IANS) A common antibiotic which is used to treat a wide range of diseases, from acne to urinary tract infections, may also help treat post-traumatic stress disorder (PTSD) by suppressing fear memory, suggest results of a trial conducted in a group of health volunteers.

PTSD is a term for a broad range of psychological symptoms that can develop after someone experiences or witnesses a traumatic event. 

The disorder is caused by an overactive fear memory, and the new research, published in the journal Molecular Psychiatry, showed that a common antibiotic, doxycycline, can reduce the fear memory response in healthy volunteers.

"We have demonstrated a proof-of-principle for an entirely new treatment strategy for PTSD," said lead author Dominik Bach from the University of Zurich in Switzerland.

The theory is based on the recent discovery that our brains need proteins outside nerve cells, called matrix enzymes, to form memories. 

"Matrix enzymes are found throughout the body, and their over-activity is involved in certain immune diseases and cancers. To treat such diseases, we already have clinically approved drugs that block these enzymes, including the antibiotic doxycycline, so we wanted to see if they could help to prevent fear memories from forming in the brain," Bach, who is also affiliated to University College London, added.

"Our results support this theory, opening up an exciting avenue of research that might help us to find treatments for PTSD," Bach noted.

In the study involving 76 healthy volunteers, participants were given either doxycycline or a placebo and learnt to associate a certain colour with an electric shock. 

The screen would flash either blue or red, and one of the colours was associated with a 50 per cent chance of receiving a painful electric shock. 

A week later they were shown the colours again, accompanied by a loud sound but no shocks, and their fear responses were measured.

The fear response was 60 per cent lower in participants who had doxycycline in the first session compared to those who had the placebo, suggesting that the fear memory was significantly suppressed by the drug. 

Other cognitive measures including sensory memory and attention were not affected.

"When we talk about reducing fear memory, we are not talking about deleting the memory of what actually happened," Bach said.

"The participants may not forget that they received a shock when the screen was red, but they 'forget' to be instinctively scared when they next see a red screen," Bach said.

The findings suggest that doxycycline can disrupt the formation of negative associations in the brain.

New York, March 27 (IANS) Feeling depressed? Beat the blues by playing video games, touted as viable and effective treatment for depression, researchers said. They help in brain training. The findings showed that playing the specifically designed video game helped people feel they had some control over their depression. Such video games had the potential to target depression caused by both internal -- such as chemical imbalance or hereditary factor -- and external factors -- like issues in job or relationship. "Through the use of carefully designed persuasive message prompts ... mental health video games can be perceived and used as a more viable and less attrition-ridden treatment option," said Subuhi Khan from the University of California - Davis in the US. Portraying depression as something caused internally because of biological factors and providing a video game-based app for brain training made participants feel that they could do something to control their depression. This supports other research that shows that brain-training games have the potential to induce cognitive changes, the researchers said. On the other hand, portraying depression as a condition caused by external factors led users to spend more time playing the game -- again, perhaps giving them a feeling of control over their situation. But this result was likely due to immediate engagement and was unlikely to have long-term benefits, the study noted. In the study, forthcoming in the journal Computers in Human Behavior, the team asked 160 student volunteers to play six, three-minute games. Each game was an adaptation of neurophysiological training tasks that have been shown to improve cognitive control among people experiencing depression and ended on basic inspirational notes to inspire the participant to play the game. The results revealed that when the video game users were messaged reminders, they played the game more often and in some cases increased the time spent playing.

​Washington, March 30 (IANS) Google, the technology giant born out of the internet age, rolled out a landline telephone service on Tuesday in some US cities.

The service, known as Fiber Phone, offers basic landline features including call waiting, caller identification, unlimited local and nationwide calling and 911 services at a price of

Los Angeles, March 30 (IANS) A group of US scientists have predicted that 31 to 67 percent of Southern California beaches could be severely damaged due to rising sea levels by 2100, a new study has revealed.

The study was published online on Wednesday by the American Geophysical Union in their Journal of Geophysical Research, Xinhua news agency reported.

"Beaches are perhaps the most iconic feature of California, and the potential for losing this identity is real. The effect of California losing its beaches is not just a matter of affecting the tourism economy," Sean Vitousek, lead author of the study, said in a statement.

"Losing the protecting swath of beach sand between us and the pounding surf exposes critical infrastructure, businesses and homes to damage. Beaches are natural resources, and it is likely that human management efforts must increase in order to preserve them," said Vitousek.

Scientists applied the "CoSMoS-COAST", a newly-developed shoreline change computer modelling system for coastal hazard assessment and management planning, to simulate sandy shoreline evolution along 500 km of coastline in Southern California, which hosts complex mixtures of beach settings variably backed by dunes, cliffs, estuaries, river mouths, and urban infrastructure, providing applicability of the model to virtually any coastal setting.

"Beaches in Southern California are a crucial feature of the economy, and the first line of defence against coastal storm impacts for the 18 million residents in the region. This study indicates that we will have to perform massive and costly interventions to preserve these beaches in the future under the erosive pressures of anticipated sea level rise, or risk losing many of the economic and protective benefits beaches provide," said US Geological Survey (USGS) geologist and co-author, Patrick Barnard.

As greenhouse gas emissions continue to rise, the window to limit global warming below 2 degrees Celsius appears to be closing. Associated projections for sea-level rise generally range near or below 1 metre by 2100.