Knowledge Update

​New York, May 13 (IANS) Researchers have developed a simple paper-based test that can help patients with blood clotting disorders perform regular tests from the convenience of their homes.

While blood clotting due to cut or injury can be normal, sometimes a blood clot forms within a blood vessel that has not been injured or cut. 

For patients at risk for blood clots, strokes and hypertension, routine lab tests to monitor blood-thinning medications can be frequent, costly and painful.

Patients with cardiovascular disease, hypertension, atrial fibrillation, congestive heart failure, kidney disease and others who are at risk for blood clotting are especially vulnerable when blood-thinning medication levels get too weak or too strong. 

This imbalance can quickly lead to ischemic (clotting) or hemorrhagic (bleeding) strokes if not detected in time.

"We have developed a blood screening device for patients on medications like Coumadin, warfarin or other blood thinners who need to monitor their blood-clotting levels on a regular basis," said Andrew Steckl, professor at University of Cincinnati in the US.

"Patients can soon monitor their blood coagulation characteristics from home quickly and painlessly before making needless trips to the lab or hospital," Steckl noted.

Using nanofiber membranes inside paper-based porous materials housed within a plastic cassette, the researchers can quickly reveal the level of the blood's ability to clot, and all from the convenience of the patient's living room with a simple finger stick to draw a drop of blood.

Slight changes in the level of coagulation properties will occur normally depending on certain food intake and overall health conditions, Steckl said.

But a major change in levels immediately shows up on the paper-based test stick resulting in clotting patterns registering on one end of the spectrum or the other and will put up a red flag before any physiological trouble starts, the study said.

The findings were presented at the eighth international conference on porous media and annual meeting of the International Society for Porous Media in Cincinnati, Ohio.​

New York, May 12 (IANS) A team of researchers has created a cheap way to give a sheet of paper sensing-capabilities to respond to gesture commands and connect to the digital world.

New York, May 11 (IANS) Low doses of a general anaesthetic drug is likely to reduce suicidal thoughts in patients with treatment-resistant depression, finds a new study.

The findings showed that repeatedly infusing low doses of ketamine in depressed patients with recurrent suicidal thoughts might help them in recovering rapidly. 

"Our finding that low doses of ketamine, when added on to current antidepressant medications quickly decreased suicidal thinking in depressed patients, is critically important because we don't have many safe, effective and easily available treatments for these patients," said Dawn Ionescu, lead researcher from Massachusetts General Hospital (MGH) in the US.

Having suicidal thoughts increases the risk that patients will attempt suicide. However, the risk of suicide attempts is 20 times higher in patients with depression than the general population. 

The study, published online in the Journal of Clinical Psychiatry, was designed not only to examine the antidepressant and anti-suicidal effects of repeated low-dose ketamine infusions, but also to examine the safety of increased ketamine dosage.

The team enrolled 14 patients with moderate to severe treatment-resistant depression who had suicidal thoughts for three months or longer and they received two weekly ketamine infusions over a three-week period. 

The initial dosage administered was 0.5 mg/kg over a 45-minute period -- about five times less than a typical anaesthetic dose -- and after the first three doses, it was increased to 0.75 mg/kg. 

The participants were assessed on measures of suicidal thinking, in which patients were directly asked to rank whether they had specific suicide-related thoughts, their frequency and intensity.

The results showed that most of them experienced a decrease in suicidal thinking, and seven achieved complete remission of suicidal thoughts at the end of the treatment period. 

"The study that aim to understand the mechanism by which ketamine and its metabolites work for people with suicidal thinking and depression may help us discover areas of the brain to target with new, even better therapeutic drugs," Ionescu concluded.​

​Tokyo, May 12 (IANS) After analysing a 3D map of 3,000 galaxies 13 billion light years from Earth, an international team led by Japanese researchers has found that theoretical physicist Albert Einstein's general theory of relativity is still valid.

Since it was discovered in the late 1990s that the universe is expanding at an accelerated rate, scientists have been trying to explain why.

The mysterious dark energy could be driving acceleration, or Einstein's theory of general relativity, which says gravity warps space and time, could be breaking down.

“We tested the theory of general relativity further than anyone else ever has. It's a privilege to be able to publish our results 100 years after Einstein proposed his theory," said project researcher Teppei Okumura from Kavli Institute for the Physics and Mathematics (Kavli IPMU) at University of Tokyo.

To test Einstein's theory, the team led by Okumura and colleagues, with researchers from Tohoku University and Kyoto University, used “FastSound Survey” data on more than 3,000 distant galaxies to analyze their velocities and clustering.

The results indicated that even far into the universe, general relativity is valid, giving further support that the expansion of the universe could be explained by a cosmological constant as proposed by Einstein in his theory of general relativity.

“Having started this project 12 years ago, it gives me great pleasure to finally see this result come out," added Karl Glazebrook, professor at Swinburne University of Technology who proposed the survey.

No one has been able to analyse galaxies more than 10 billion light years away but the team managed to break this barrier thanks to the FMOS (Fiber Multi-Object Spectrograph) on the Subaru Telescope which can analyse galaxies 12.4-14.7 billion light years away.

The details of the study were published in the Publications of the Astronomical Society of Japan.​

​New York, May 12 (IANS) Researchers from Harvard University have developed a flexible exosuit that reduces the energy required for walking when carrying a heavy load - helping people like soldiers, rescuers in emergency situations or hikers who frequently have to do so.

The exosuit reduced the amount of energy required while walking with a load - the metabolic cost - by 7.3 percent on an average.

The suit also significantly reduced the work done by the hip, knee and ankle joints, without impacting step frequency or length.

This suggests that the suit does not affect the wearers' freedom of movement but allows them to return to a walking profile closer to that of people walking without a load.

“Apart from assisting load carriers, we are exploring how the soft exosuit can be used to assist individuals with impaired movement, paving the way for the use of this technology in a wide range of people,” said Conor Walsh, the corresponding author.

The Harvard researchers used textiles to build their alternative to rigid exoskeletons which are heavier and can interfere with the natural movement of the joints, causing the wearer to change the way they walk.

The suit is composed of a waist belt, two thigh pieces and two calf straps, connected by cables to two motors mounted on a backpack.

The energy from the motors travels via the cables to the suit which transfers it to the wearer.

The suit becomes active only when it detects a walking motion.

It assists the hip and ankle joints which together contribute about 80 percent of the power produced by the leg joints during walking.

“Our results demonstrate for the first time that an autonomous soft exosuit can reduce the energy expenditure experienced by load carriers, possibly enhancing their overall gait performance,” Walsh added in a paper published in the Journal of NeuroEngineering and Rehabilitation.

Seven experienced load carriers who had no injuries or diseases of their muscles, joints or bones, walked on a treadmill at a constant speed of 1.5 meters per second while carrying a load equal to 30 percent of their body mass.

Researchers monitored the participants' metabolism, kinetics (forces that influence the movements of the body) and kinematics (extension or rotation of joints and muscles).

The researchers also analysed the participants' breathing, gait and muscle activation.

The device can also prove useful for people with physical impairments, the authors noted.​

​New Delhi, May 12 (IANS) Software major Adobe on Thursday unveiled its new Document Cloud in India to transform tedious paper-based processes to digital workflows, thereby improving efficiency and productivity for users, a senior Adobe executive said.

​New York, May 11 (IANS) Including seafood or other foods containing omega-3 fatty acids at least once a week in your diet may protect against age-related memory loss and thinking problems, says a study.

The age-related memory loss and thinking problems of study-participants who reported eating seafood less than once a week declined more rapidly compared to those who ate at least one seafood meal per week.

"This study helps show that while cognitive abilities naturally decline as part of the normal ageing process, there is something that we can do to mitigate this process," said study senior author Martha Clare Morris from Rush University Medical Centre in Chicago, US.

The findings were published online in the journal Neurology.

The researchers followed 915 people with a mean age of 81.4 years for an average of five years. 

At study enrollment, none had signs of dementia.

During the course of the study, each person received annual, standardized testing for cognitive ability in five areas -- episodic memory, working memory, semantic memory, visuospatial ability and perceptual speed. 

The study group also completed annual food frequency questionnaires, allowing the researchers to compare participants' reported seafood intake with changes in their cognitive abilities as measured by the tests.

The questionnaires included four types of seafood: tuna sandwiches; fish sticks, fish cakes and fish sandwiches; fresh fish as a main dish; and shrimp, lobster and crab. 

The participants were divided into two groups: those who ate at least one of those seafood meals per week and those who ate less than one of those seafood meals per week.

People who ate more seafood had reduced rates of decline in the semantic memory, which is memory of verbal information. They also had slower rates of decline in a test of perceptual speed, or the ability to quickly compare letters, objects and patterns, the findings showed.

Seafood is the direct nutrient source of a type of omega-3 fatty acid (docosahexaenoic acid) that is the main structural component of the brain.

​New York, May 11 (IANS) A team of US researchers has come up with a rough map of part of the brain that controls vision and leaves things out even when they are plainly in sight.

The frontal cortex is often seen as our “thinking cap,” associated with thinking and making decisions. But it's not commonly connected with vision. 

“Some people believe that the frontal cortex is not involved. The new research adds to previous evidence that it is,” said Dobromir Rahnev, psychologist at Georgia Institute of Technology.

“The 'thinking cap' of the brain controls and oversees the whole process, making it as essential to how we see as those other areas,” Rahnev explained. 

How that works also accounts for why we sometimes miss things right in front of us.

“We feel that our vision is like a camera, but that is utterly wrong," Rahnev said. 

Our brains aren't just seeing, they're actively constructing the visual scene and making decisions about it. 

Sometimes the frontal cortex is not expecting to see something so although it's in plain sight, it blots it out of consciousness, said the team that involved researchers from the University of California-Berkeley.

The frontal cortex sends a signal to move your attention onto the object you select.

“It does some of the combining with other information, and then it's probably the primary evaluator of what you think you saw,” Rahnev noted.

The findings were published in the journal of the Proceedings of the National Academy of Sciences.​

​London, May 11 (IANS) There is good news for mango lovers! You may soon be able to tell how ripe a mango is without having to taste it as researchers have identified a way to “sniff” the ripeness of the fruit.

They have identified the unique chemical signature of ripening for mangoes, a development that could lead to small hand-held electronic noses to detect the ripeness of not just mangoes but other fruits as well.

Mangoes are one of the most important and popular tropical fruits with India producing approximately 40 percent of the world's supply. 

"It is really important for people to be able to tell how ripe fruit is without having to taste it. This is important for fruit producers and supermarkets,” said lead researcher Paul Monks, professor at the University of Leicester in Britain.

The new research, published in the journal Metabolomics, has shown that is possible to 'sniff' the ripeness of mangoes.

"We used a novel fast-sensitive "electronic-nose" for sniffing volatile compounds from the ripening fruit. Popular supermarket species of mango were used. In particular, the work showed an increase in ester compounds -- the smell of pear drops -- was a particular marker of over ripe fruit," Monks noted.

The work has, for the first time, followed in real-time and detail the chemical signatures of ripening for mangoes, Monks said.

"There are some real potential applications of this research for making devices to be able to assess ripeness non-destructively. The information gained from the work could be used to develop small, hand-held electronic noses that could be deployed to assess fruit maturity prior to picking and thus determine the optimum point to harvest mature green mangoes,” he added.​

​London, May 11 (IANS) A long wait before asking for feedback about a service or product would increase the odds of getting a better review by your customers, researchers say.

The findings revealed that people who waited longer or travelled farther before authoring a review gave more favourable evaluations.

"If someone visited a particular restaurant in their home town and then in another state, he or she gave a better star rating when the restaurant was out of town," said lead author Nina Huang from Temple University in Pennsylvania.

The investigators analysed data from more than 166,000 online restaurant reviews on travel website TripAdvisor.com that provides reviews of travel-related content. 

They used a Google Maps application and information in the reviewer's profile to calculate the distance between the author's home and the restaurant.

The same positive effect occurred when reviewers waited two or more months versus one month or less to write a review. 

The researchers discovered that reviewers who experienced both time delay and greater physical distance from the restaurant gave the highest ratings. 

It might be wise to take a moment to distinguish between reviews written by locals versus travellers before judging a product or service, the authors noted in a paper published in the Journal of Consumer Psychology. 

"When people are reading a review, they assume it is objective," Huang noted, adding, "We found that reviews are not always as objective as we thought. Time and space distance is going to bias someone's evaluation of certain experiences."​