Tree frogs convey aggression using body vibrations

Washington, May 21 (ANI): Researchers at the Smithsonian Tropical Research Institute in Panama have discovered that male red-eyed tree frogs communicate with one another in aggressive contests by using vibrations they send through their plant perches.

“In the case of red-eyed treefrogs, tremulation displays in which the frogs shake their entire bodies convey information about the status and aggressive intent of the signaler,” says Michael Caldwell of Boston University.

“They also appear to carry information about the size of the signaler.”

Using experiments involving a mechanical shaker and a robotic frog, the researchers found that plant-borne vibrations generated by the shaking display of the vertebrates act as a signal and are both necessary and sufficient to elicit tremulations by other treefrogs in response.

These tremulations or responses depend on the size of the treefrog and the context. Their other signaling behaviours, such as their acoustic calls, also generate strong and stereotyped vibrations that travel through plants and might carry information.

Unlike earlier studies where the researchers observed the treefrogs under white light, in this study, they used infrared source of light.

“When we attached vibration-sensitive accelerometers to the plants and looked at the frogs under infrared light, we saw a whole new range of fascinating behaviors,” Caldwell said.

“Studies on frogs, birds, and primates have formed the core of our understanding of vertebrate communication,” the researchers write, “yet we know almost nothing about vibrational signaling in these species. The further study of vibrational communication among arboreal vertebrates presents important unexplored opportunities to improve our comprehension of the behavioral ecology of these species, and of animal communication as a whole.”

The study was published online on May 20th in Current Biology, a Cell Press publication. (ANI)

Technology makes people happier – especially women

London, May 14 (ANI): Access to Internet and communication devices can increase people”s sense of satisfaction and well being – especially amongst women, says a new study.

The survey of 35,000 people, carried out by BCS, the Chartered Institute of IT around the world, found that access to information technology had an “enabling and empowering role”, which lead to greater “life satisfaction”.

“IT appears to empower the disempowered,” read the report. “In fact, much of the improvement in life satisfaction that arises from information technology flows to those who are less well-placed in society. Those on lower incomes or with fewer educational qualifications appear to benefit more from access to IT than those on higher incomes or with higher educational backgrounds. This appears to be the case across the globe.

“The research indicates this relationship, but not the mechanism; this is an area for further study.”

Women, being the social hub of communications in their families, societies and work, are even more benefited due to IT. Those on lower incomes also gained from IT access.

“Anything that increases the sense of personal control in our lives, such as IT, will reduce anxiety and stress and keep us mentally well,” The Telegraph quoted Donna Dawson, a psychologist, as saying.

“Through giving us choices, allowing is access to information, and putting us in touch with others, IT can increase feelings of security, personal freedom and power, which together give us greater life satisfaction.” (ANI)

Misinformation about antibiotics spreads quickly via Twitter

Washington, March 31 (ANI): A new study has revealed that misinformation about antibiotics can travel to large audience through social networking sites like Twitter.

Experts from Columbia University and MixedInk (New York, NY) examined the health information content of Twitter updates mentioning antibiotics to determine how people are sharing information and assess the proliferation of misinformation.

The investigation explored evidence of misunderstanding or misuse of antibiotics.

“Research focusing on microblogs and social networking services is still at an early stage. Further study is needed to assess how to promote healthy behaviors and to collect and disseminate trustworthy information using these tools,” Daniel Scanfeld and colleagues said.

The authors stressed that because health information is shared extensively on such networks, it is important for health care professionals to have a basic familiarity with social networking media services, such as Twitter.

They add that such services can potentially be used to gather important real-time health data and may provide a venue to identify potential misuse or misunderstanding of antibiotics, promote positive behavior change, and disseminate valid information.

The study appears in the April issue of AJIC: American Journal of Infection Control. (ANI)

Jab that can cure phobias may soon be a reality

Washington, Mar 23 (ANI): Researchers at the University of Hiroshima in Japan have found a way to switch off a ”fear centre” in the brain, a finding that could make cure for phobias a reality.

Boffins claim that injecting a common local anaesthetic directly into the brain may cure fears.

Masayuki Yoshida and Ruriko Hirano studied the cerebellum, an area of the brain thought to be involved with the development of our fears, in goldfish, the boffins reported in BioMed Central”s open access journal, Behavioral and Brain Functions.

Using classical conditioning, Yoshida and Hirano taught their fish to become afraid of a light flashed in their eyes. By administering a low voltage electric shock every time a light was shone, the fish were taught to associate the light with being shocked, which slowed their hearts – the typical fish reaction to a fright.

Yoshida explains, “As you would expect, the goldfish we used in our study soon became afraid of the flash of light because, whether or not we actually gave them a shock, they had quickly learned to expect one. Fear was demonstrated by their heart beats decreasing, in a similar way to how our heart rate increases when someone gives us a fright”.

Humans can also be ”trained” to become afraid, and in fact, simple classical conditioning rooted in our childhood and early development can explain many of our behaviours.

In this study however, the team discovered that fish that had first been injected in the cerebellum with lidocaine had stable heart rates and showed no fear when the light was shone – they were unable to learn to become afraid.

Since the brains of goldfish show many similarities with those of mammals, including humans, it is hoped that with further study it may soon be possible to understand more about the biological and chemical processes that cause us to become afraid. (ANI)

Employment myths cloud Social Trends survey

It was a case of “lies, damned lies and statistics,” a happy headline, and a gullible media sucked in by the spin.

When the ABS released its latest Australian Social Trends survey, its media release was titled: “Part-time work cushioned Australia’s economic downturn”.

Correct, as far as it goes, and entirely unremarkable: that’s old news and blindingly obvious from the employment figures released each month.

The significance of the Social Trends report is that it undercuts this happy story.

It reveals a far more complex picture of the impact of the economic slowdown on men, women, and young people.

It shows that, even in a downturn ranked by the Reserve Bank as one of the shallowest ever experienced here, young people fared badly.

The prospects for those in the youth labour market deteriorated markedly and the employment outlook for teenagers entering the labour force without qualifications became grim.

More than half of those who left school in 2008 without matriculating couldn’t find a full-time job or a place in further study in 2009.

The share of people under 25 in the workforce fell by 5 percentage points during the latest downturn; a little less severe than the fall in youth employment during the recessions of the early 1980s and 1990s but bad enough.

About a third of those people became unemployed.

A greater share simply dropped out of the labour force.

The result: a rise in the number of young people who are “disengaged” from work and formal education.

On the ABS figures, last year, in the wake of the slump in economic growth, almost one in five people under 25 were neither in full-time work or studying.

History shows that the jobs for young people that disappear during a downturn tend not to come back.

Men, the main breadwinners in most households, also suffered an erosion of full-time employment opportunities.

Part-time employment failed to offset the destruction of full-time employment for male workers and the shedding of full-time male jobs, a typical feature of recessions, led mainly to a rise in joblessness among men.

More than half of the decline in male full-time employment was accounted for by a rise in unemployment, and only around one-third by an increase in part-time employment.

The most feminised of industries was also hit hard.

In this supposed mildest of economic declines, jobs in the retail sector were slashed.

On the official estimate, 51,700 jobs were shed from the retail sector, a decline of about 4 per cent. Full-time jobs accounted for more than two thirds of that decline.

That’s a significantly worse outcome for the retail sector than in the deep recession of 1990-91.

Imagine what would have happened were it not for the $10 billion cash handouts the Federal Government delivered in an effort to boost consumption.

And while a rise in part-time work did “cushion” the destruction of work during the downturn, the cushion was a lot thinner than in the last slowdown in 2001.

Back then, says the ABS, a rise in part-time work was a “defining feature” and more than half the fall in full-time employment was offset by a rise in part time work.

In contrast, in the latest downturn, “it was increasing unemployment, as well as growing part-time employment, that accounted for the bulk of the decline”.

So why would the ABS headline its media release “Part-time work cushioned the downturn”, and why would the media uncritically parrot this line (even, sadly, the ABC’s flagship evening television news bulletin)?

Because it fits the mythology about how Australia rode out the GFC.

The myth is that the unemployment rate stayed pretty low primarily because of “work sharing”.

This congenial narrative – told by the Government, the RBA, the employer groups and the market economists – explains the lower than feared unemployment rate as a product of win-win “flexibility”.

Rather than lay people off, employers cut workers’ hours, showing a combination of benevolence and far-sighted self-interest. Businesses had seen how hard it can be to get skilled labour during the boom years so wisely kept people on in the lean times.

Employees, showing good sense and “flexibility”, agreed to accept short work-weeks in the hard times so they and their colleagues could keep their jobs.

Anyone with even a skerrick of understanding about how labour markets work in the real world knows that this could only be part of the story.

Celebrated examples aside, as an over-arching explanation for the labour market outcomes during 2008-09, it’s absurd.

Labour markets are heterogeneous. As demand slumped and fear reigned, alongside labour hording, there was job destruction – a complex patchwork of responses by firm and by industry.

The myth that’s become conventional wisdom implies that the jobs that became part-time were the same jobs that were full-time beforehand, employing the same people.

A study of more than 6,500 workers by the Workplace Relations Centre at the University of Sydney highlights a very different dynamic.

It found that large numbers of employees lost their jobs and were re-employed on fewer hours with reduced pay and entitlements.

For many, the result was a shift from ongoing full-time employment to more precarious casual work.

The ABS Social Trends survey confirms that, in every economic downturn since the recession of the early 1990s, there’s been a decline in full-time employment and a rise in part-time jobs.

Although the data in this survey sheds no light on the issue, we know from separate statistics and research that many of those part-time jobs are casual.

So it’s likely that the latest downturn has continued a long-term structural trend – the “casualisation” of the labour market.

That trend was suppressed in Australia during the latter years of the long-boom when the unemployment rate had a four in front of it and there were shortages in skilled labour, but it remains the underlying dynamic.

It is, in part, the result of a business strategy designed to buffer companies from economic shocks.

Cut the share of “permanent” employees on the books, and you can tailor your labour usage to peaks and troughs in demand, and avoid having to pay redundancy when things turn sour.

Announcing its latest first half profit – a record $100 million – the retailer David Jones confirmed that a variation on this strategy was the key to its profits during the downturn.

DJ’s chief executive Mark McInnes said the company hasn’t employed a single full-time retail salesperson since 2004 – so it’s been able to adjust the working hours of it store staff to match sales volumes.

That’s a logical response, and it has certain spin-off macro-economic benefits: it’s far better to have people under-employed than unemployed.

But it’s a less congenial narrative than the story of “work sharing” and “flexibility”.

Family more important than career for women: Oz survey

Melbourne, Mar 5 (ANI): A new survey has revealed that most women are opting for a healthy family life rather a career.

A national study of almost 2300 women, commissioned by parenting website Kidspot, showed three quarters of respondents aged between 18 and 65 believe family is the single most important thing in their life.

The survey says women are shifting from a “perfectionist” attitude and rate their family, seeing friends, keeping fit, further study and community work as more important than pursuing their career.

Jenni Colwill president of 2020Women, an organisation that promotes gender equality, said while the emphasis on family was not surprising, the results suggested women were “disengaged” in other areas and this was not the case.

“We’ve got this opinion that women have to do everything, the paid and the unpaid work, the family responsibilities and I’m not sure that has necessarily changed,” News.com.au quoted her as saying.

“I think what you see now is women who are more assertive, when they get annoyed with the workplace, they’re more likely to express their dissatisfaction and leave,” she said.

Kidspot chief executive Katie May, however, believes women today “no longer believe that ‘having it all’ requires ‘doing it all’.

“The areas causing a woman the least stress today are trying to succeed in a man’s world and the inability to progress her career due to commitments at home,” she said.

“It’s a change on what we’ve seen previously and a move away from perfectionist attitudes of many women,” she added. (ANI)

Large variations exist in peoples’ ability to eliminate arsenic from body

Washington, Aug 27 (ANI): A new study has shown that large variations exist in peoples’ ability to eliminate potentially toxic substance arsenic from the body.

In the study, Kevin Francesconi and colleagues found that some people eliminate more than 90 percent of the arsenic consumed in the diet while others store arsenic in their bodies, where it can have harmful effects.

Health effects from chronic arsenic exposure include skin and internal cancers, cardiovascular disease, and possibly diabetes.

Researchers say that drinking water in many parts of the world, including some regions of the United States, contain amounts of arsenic that exceed the World Health Organization’s maximum acceptable levels.

The study also found that consumption of seafood is another major source of arsenic contamination.

The scientists describe monitoring arsenic excretion in the urine of human volunteers.

They found that ability to eliminate arsenic from the body varied greatly, with some participants excreting up to 95 percent of the ingested arsenic but others eliminating as little as four percent.

“This observed individual variability in handling [arsenic] exposure has considerable implications for the risk assessment of arsenic ingestion,” the study states.

It adds that further study is needed to assess potential risks to humans consuming seafood products.

“The data presented here suggest that the long held view that seafood arsenic is harmless because it is present mainly as organoarsenic compounds needs to be reassessed,” the study states.

The research is scheduled for the Sept. 21 issue of ACS’s Chemical Research in Toxicology, a monthly journal. (ANI)

Loch Ness Monster ‘spotted’ on Google Earth?

London, Aug 26 (ANI): A Brit man claims that he spotted the Loch Ness Monster on Google Earth.

The Loch Ness Monster is a creature believed to inhabit Loch Ness in the Scottish Highlands. It is similar to other supposed lake monsters in Scotland.

Jason Cooke spotted “Nessie” while browsing the website’s satellite photos.

The image on the surface of the 22-mile Scottish loch is 65ft long and appears to have an oval body, a tail and four legs or flippers.

Some experts believe Nessie may be a Plesiosaur, an extinct marine reptile with a shape like the Google image.

“I couldn’t believe it. It’s just like the descriptions of Nessie,” the Sun quoted security guard Jason, 25, of Nottingham as saying.

“This is really intriguing. It needs further study,” added researcher Adrian Shine, of the Loch Ness Project. (ANI)

Scientists identify lake shorelines on Mars

Washington, August 9(ANI): A team of scientists, using images from the High Resolution Imaging Science Experiment (HiRISE) camera on board NASA’s Mars Reconnaissance Orbiter, have reported direct evidence of lake shorelines in the Shalbatana Vallis in Mars.

Scientists generally believe that warm, wet conditions existed on Mars until only about 3.7 billion years ago.

In recent years, however, remote sensing studies have hinted at the existence of Martian lakes during the Hesperian epoch (about 3.5 billion to 1.8 billion years ago).

Now, sub-meter-scale images from NASA’s Mars Reconnaissance Orbiter show clear, unambiguous evidence of shorelines of a lake more than 450 meters (1,476 feet) deep that formed about 3.4 billion years ago.

The study indicates that conditions favorable for flowing water and lake formation may have existed for thousands of years on Mars during the Hesperian epoch, which has been thought to be a period during which surface conditions did not allow significant hydrological activity.

According to the researchers, the sedimentary deposits associated with the lake in Shalbatana Vallis should be considered a priority for further study by future landed Mars missions. (ANI)

ISRO chief satisfied with lunar data compiled by Chandrayaan

Bangalore, July 12(ANI): G Madhavan Nair, Chairman of Indian Space Research Organisation (ISRO), on Sunday expressed satisfaction with the successful collection of data about the moon by Chandrayaan, country’s maiden lunar mission.

Madhavan Nair stated this while addressing the 9th convocation of International Institute of Information and Technology at Bangalore on Sunday.

He mentioned that the tracking and detection of several factors by Chandrayaan are important steps in mapping the mineralogical composition of moon’s surface which in turn would enable further study in its origin and evolution.

“I think I am happy to say that Chandrayaan has been completely successful in collecting all the data what we wanted. First was the three dimensional of the lunar surface, also getting the mineral content of the surface and then trying to use the extra instruments,” said G. Madhavan Nair.

“All this went on very well and we are more or less very happy that the mission is complete,” he added.

Chandrayaan-1 was launched on October 22 last year.

Madhavan Nair also added that the second moon mission would be launched by 2012. (ANI)

Biomarker for anorexia identified

Washington, June 24 (ANI): A brain protein called BDNF can act as a biomarker to differentiate between healthy and anorexic women, revealed a study.

Anorexia is a serious and occasionally fatal eating disorder most commonly affecting women.

While the physical causes of anorexia are not yet understood, some studies have suggested have linked the disorder with low levels of BDNF.

Now, a study recommended by Cynthia Bulik- a member of Faculty of 1000 Medicine and leading expert in the field of psychiatry and eating disorders- has shown that BDNF levels are higher in women who have recovered from anorexia.

This indicates that low BDNF levels may be reversible.

Researchers at Chiba University in Japan found that anorexic women had lower levels of BDNF in their blood than healthy women or those who had recovered from anorexia.

They also observed that women with low BDNF also had the lowest self-image, suffered from anxiety and depression, and performed poorly on certain tests of cognitive ability.

However, the researchers have claimed that further study is needed to determine what role BDNF plays in anorexia, and if it can be used to predict the risk of developing it.

However, Bulik predicted: “BDNF may emerge as a useful biomarker of [anorexia] and of recovery from [anorexia].” (ANI)

Lithium in water may cut suicide risk

London, May 2 (ANI): Drinking water containing the element lithium may decrease the risk of suicide, suggests a Japanese study.

In the British Journal of Psychiatry study, researchers examined levels of lithium in drinking water and suicide rates in the prefecture of Oita, which has a population of more than one million.

From analyses, scientists found that the suicide rate was significantly lower in those areas with the highest levels of the element.

But the team from the universities of Oita and Hiroshima found that even relatively low levels appeared to have a positive impact of suicide rates.

Levels ranged from 0.7 to 59 micrograms per litre, reports The BBC.

The researchers speculated that while these levels were low, there may be a cumulative protective effect on the brain from years of drinking this tap water.

The findings have led some researchers to call for further study to consider the public health benefits of adding lithium to drinking water supplies. (ANI)

Bone density may help predict prostate cancer risk

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Washington, April 27 (ANI): A new study by Johns Hopkins researchers has found that men with denser bones may be more likely to develop prostate cancer./pp
Recent research at other institutions has suggested that women with high bone mineral density are at an increased risk of aggressive breast cancer. /pp
For the study, Stacy Loeb, M.D., in the Department of Urology at the Johns Hopkins University School of Medicine, and colleagues gathered data from the BLSA, a long-term study that has tracked health-related information for hundreds of Baltimore-area men and women since 1958. /pp
The researchers collected data on the bone mineral density of 519 men, measured from 1973 to 1984. They then looked at BLSA data again to see which men were eventually diagnosed with prostate cancer. /pp
When they analyzed their results, researchers found that the 76 men who went on to develop prostate cancer had bone density that remained significantly higher as they aged compared to those who remained cancer free./pp
Although the reasons for this phenomenon are unclear, Loeb speculates that growth factors in bone may contribute to prostate cancer growth. /pp
Additionally, bone density may reflect sex hormone levels in men, which can also affect prostate cancer development./pp
We don’t have an explanation yet, but we’re hoping that these findings stimulate further study, said Loeb. /pp
The study has presented at the American Urological Association Annual Meeting 2009. (ANI)/p

Perception of time pressure impairs performance

Washington, Feb 11 (ANI): If you feel that you don’t have enough time to finish a task in hand, then chances are your finished work won’t be up to the mark, says a new study, which claims that it’s the perception of time pressure that impairs performance.

In a first of its kind study, Michael DeDonno, a doctoral student in psychology at Case Western Reserve University looked at how perceived time pressure affected the performance of 163 subjects in the Iowa Gambling Task (IGT).

IGT is a popular psychological assessment tool that is used to investigate the effect of perceived time pressure on a learning-based task.

“Research has shown that it’s not necessarily the time pressure, but it’s the erception of that time pressure that affects you. If you feel you don’t have enough time to do something, it’s going to affect you,” said DeDonno.

For the study, he divided the participants into two groups: an experimental group that was informed the time allotted to perform the task was insufficient and the control group, which was told they had typically sufficient time to complete the task.

It was found that participants who were advised the time was insufficient performed worse than those who were told they had enough time, regardless of the actual time allotted.

“If I told you that you didn’t have enough time, your performance was low regardless if you had ample time or not. If you were told you had enough time, in both scenarios, they out performed those who were told they didn’t,” said DeDonno.

He said that there are plenty of real-world benefits to understanding the effects of perceived time pressure on decision-making performance.

He cited project team members who perceived a high degree of time pressure had lower job satisfaction.

He also noted standardized tests, like the ACT or LSAT, have a high rate of test anxiety by test takers due mostly to time constraints.

He is planning to further study if a perception of time being insufficient by HMO physicians lead to inappropriate medications or an increase in diagnostic error.

Although it’s still not known why perceived time pressure could impair performance, DeDonno said that it’s possible to combat it.

He said: “Decision-making can be emotion based, keep your emotions in check. Have confidence in the amount of time you do have to do things. Try to focus on the task and not the time. We don’t control time, but we can control our perception. It’s amazing what you can do with a limited amount of time.

“Time is relevant. Just have the confidence with the time you’re given. I tell my students ‘Do the best you can in the time allotted. When it ends, it ends.’”

The study was published in a recent issue of Judgment and Decision Making. (ANI)

Antidepressant may benefit elderly with generalized anxiety disorder

Washington, Jan 21 (ANI): Researchers from Washington University, St. Louis, have found that a drug commonly used to treat depression can benefit older adults with generalized anxiety disorder (GAD).

The use of drug escitalopram provided some improvement in symptoms for older adults with generalized anxiety disorder, according to the researchers.

The study led by Eric J. Lenze, MD was conducted on 177 participants age 60 years or older.

They were randomly divided to receive either 10 to 20 mg/d of escitalopram (n = 85) or matching placebo (n = 92) for 12 weeks. Anxiety and other outcomes were measured using a number of assessment tools.

The findings revealed that participants treated with escitalopram showed greater improvement in anxiety symptoms and role functioning, activity limitations and impairments in role and social functioning.

However, overall benefits were diminished because of non-adherence to the drug by some patients.

It led to adverse effects like fatigue or sleepiness, sleep disturbance and urinary symptoms.

“The lack of efficacy of escitalopram in the analysis is consistent with its overall modest efficacy, diminished further by nonadherence,” said the authors.

“Given that patients with anxiety disorders are often poorly adherent to pharmacotherapy, these negative results may more accurately portray the results of treatment in clinical settings.

“It is important for clinicians to emphasize to their anxious older patients the need for an adequate trial in which to observe any benefits, as well as the expectation and nature of adverse effects.

“Further study is required to assess efficacy and safety over longer treatment durations,” they added. (ANI)