Most married military couples are satisfied

Washington, May 16 (ANI): Majority of married people at an Army post are satisfied with their relationship, despite challenges faced like deployments, a study at Kansas State University has found.

“Because of the stressors that have been on the military and military families, particularly in the last decade, it”s easy to focus on the difficulty and dysfunction of their marriages,” said Jared Anderson, assistant professor of family studies and human services at K-State. “But I think one of the things that this study does is look at what makes these families resilient in the midst of ongoing stress.”

K-State researchers in family studies and human services studied the marital quality of military couples and identified factors that relate to relationship distress.

Their findings showed that the vast majority of people in the sample were non-distressed in their relationship. The researchers include Anderson; Matthew Johnson, graduate student in marriage and family therapy, Manhattan; and Laura Cline, senior in family studies and human services, Overland Park.

Anderson studies how couples develop and maintain strong marriages, and conversely, the factors that contribute to relationship problems. By understanding factors associated with distress, he said interventions could be developed to target at-risk marriages.

“I think it”s just as important, or more important, to learn factors of non-distressed marriages because that gives us a picture into what we can actually do to replicate that for other families,” Anderson said.

He said there is much information about successful civilian marriages, which can be partly applied to military marriages, though there are differences. The researchers said it is important to understand marital quality in military couples because it”s associated with marital stability and personal well-being. Additionally, the quality of a soldier”s marriage has potential implications for soldier retention and readiness.

The study used data collected in spring 2008 and included a sample of 700 U.S. Army soldiers and 390 spouses of soldiers at Fort Riley. Participants completed a survey that included demographic and quality of life questions, including measures for marital satisfaction.

After analyzing the data, the researchers found that the majority of the participants fell in the non-distressed range of their marital satisfaction. The findings showed that 81 percent of soldiers and 85 percent of spouses were categorized as relationally non-distressed.

The researchers also looked at factors that differentiated the participants categorized as distressed and non-distressed in their relationship. Overall, soldiers were 1.7 times more likely to be relationally distressed than the spouses of soldiers in the sample. While no factors were associated with distress or non-distress for the partners of spouses of soldiers, there were several variables linked to relational distress for soldiers.

A greater likelihood of being relationally distressed was associated with soldiers whose families did not accompany them to their current duty station and soldiers with newer marriages, who were dating or engaged versus being married and who were lower in rank.

The study also looked for an association between the number of deployments and relational distress. Almost all of the soldiers in the study sample had been deployed at least once, and one-third of the soldiers had been deployed two or more times.

“Deployment didn”t factor into distress,” Anderson said. “It”s interesting, but within context it makes sense.” (ANI)

Dwindling testosterone levels ‘behind reduced sleep in middle-aged men’

Washington, May 15 (ANI): Decreased testosterone is to be blamed for reduced sleep in middle-aged men, according to a researcher.

At 30 years old, male testosterone levels drop by one to two percent annually. By age 40, men”s quality of sleep begins to diminish. And according to Zoran Sekerovic, a graduate student from the University of Montreal Department of Psychology, who presented his findings at the annual conference of the Association francophone pour le savoir (ACFAS), their exists a relationship between the two.

Sekerovic discovered a link between testosterone levels in men over 50 and their quality of sleep – specifically less deep sleep i.e. Phases III and IV of the slumber cycle.

“Deep sleep is when the recuperation of body and mind is optimal,” says Sekerovic, adding his is the first study to find this correlation.

In young men, deep sleep represents 10 to 20 percent of total sleep. By age 50, it decreases to five to seven percent. For men over 60, it can disappear altogether. The study didn”t find any correlation with other parts of the sleep cycle: falling asleep, Phases I and II, or paradoxical sleep, when most of dreaming occurs.

The University of Montreal researcher explains that men in their 20s don”t have such a correlation because their neuronal circuits are intact. “With age, there is neuronal loss and the synchronization of cerebral activity isn”t as good, which is why there is a loss of deep sleep. Because deep sleep requires great synchronization,” says Sekerovic. “Low levels of testosterone intensify the lack of synchronization and can explain 20 percent of men”s inability to experience deep sleep.”

Sekerovic suggests dwindling testosterone levels are what impact sleep, not vice-versa, as other studies have suggested. He adds previous investigations measured daily fluctuations in testosterone levels, which are higher in the morning.

“The loss of deep sleep is a serious problem that could be treated with testosterone. That would be tremendous progress,” says Sekerovic. “But hormone therapy can have secondary effects. Therefore, it will be essential to better understand the mechanisms leading to the loss of deep sleep.” (ANI)

Men with more money have bigger waistlines

Washington, May 15 (ANI): Wealthy men increase their likelihood of being overweight with every extra dollar they make, a new Canadian study has claimed.

The study, led by Nathalie Dumas, a graduate student at the University of Montreal Department of Sociology, presented the finding at the annual conference of the Association francophone pour le savoir (ACFAS).

“Women aren”t spared by this correlation, but results are ambiguous,” says Dumas. “However, women from rich households are less likely to be obese than women of middle or lower income.”

To reach the conclusion, Dumas used data from the 2004 Canadian Community Health Survey (CCHS). This provided access to information from some 7,000 adults aged 25 to 65.

After analysing the data, Dumas concluded that a socioeconomic hypothesis could only explain the link of obesity and income for women.

“Since the 1980s, the greatest increase in obesity levels has been among rich Canadian and Korean men,” says Dumas. “We still can”t explain why.” According to Dumas, one possible explanation is dining out. “Canadians love restaurants. And people who regularly eat out have no control over what they eat. They also tend to eat more calories and consume larger amounts of alcohol.”

Too many restaurant meals, combined with a decrease in physical activity, is another possibility.

“There are obviously various factors at play: we still haven”t empirically proved them,” says Dumas. (ANI)

Pyramids ”are most efficient shape for filling a container randomly”

London, May 13 (ANI): Pyramids are the best shape for packing candies, according to a new American research.

Graduate student Alexander Jaoshvili of New York University and his colleagues filled and shook containers of tetrahedral game dice.

The tetrahedra were packed tightly to occupy 76 percent of their containers, they found. In comparison, randomly packed spheres fill up to 64 percent of space, while squashed spheres, or ellipsoids, can fill as much as 74 percent.

The research can help develop stronger materials – MRI studies by the team demonstrate that a tetrahedral die can be locked into place by its immediate neighbours alone, making it harder to nudge out of place.

Jumbled collections of spheres, by contrast, are less rigid because any sphere can be moved by objects as far away as six diameters.

The finding can aid the development of nearly unbreakable plates.

“If, for instance, you wanted to make a very dense, rigid, hard ceramic, you would probably be better off making the powder from tetrahedra,” New Scientist quoted Jaoshvili”s adviser, Paul Chaikin, as saying.

According to Salvatore Torquato of Princeton University, tetrahedra may be able to pack together randomly even more efficiently.

In a recent simulation, Torquato and student Yang Jiao found a way to pack tetrahedra that took up more than 82 percent of space.

But this configuration may be more ordered than the one in Jaoshvili”s study.

The question is important as it”s still not known what kind of packing – random or ordered – is most efficient for tetrahedra.

Ordered, crystalline arrangements of tetrahedra can fill more than 85 percent of available space, recent simulations have found, but randomly assembled objects might be able to pack more tightly.

“Nobody knows whether the densest packing is ordered or random,” Chaikin said.

Torquato said: “People tend to think that the densest packings are always ordered, but there”s no fundamental reason why that has to be true.

“We can”t rule out the possibility that the densest packings of tetrahedra will be disordered.”

Jaoshvili”s study has appeared in the journal Physical Review Letters. (ANI)

Chemicals from seaweeds damage coral on contact

Washington, May 11 (ANI): Researchers have offered first proof that several common species of seaweeds in both the Pacific and Caribbean Oceans can kill corals upon contact using chemical means.

While competition between seaweed and coral is just one of many factors affecting the decline of coral reefs worldwide, this chemical threat may provide a serious setback to efforts aimed at repopulating damaged reefs. Seaweeds are normally kept in check by herbivorous fish, but in many areas overfishing has reduced the populations of these plant-consumers, allowing seaweeds to overpopulate coral reefs.

A study documenting the chemical effects of seaweeds on corals was scheduled to be published May 10, 2010 in the early edition of the journal Proceedings of the National Academy of Sciences (PNAS).

“Between 40 and 70 percent of the seaweeds we studied killed corals,” said Mark Hay, a professor in the School of Biology at Georgia Tech. “We don”t know how significant this is compared to other problems affecting coral, but we know this is a growing problem. For reefs that have been battered by human use or overfishing, the presence of seaweeds may prevent natural recovery from happening at all.”

Coral reefs are declining worldwide, and scientists studying the problem had suspected that proliferation of seaweed was part of the cause – perhaps by crowding out the coral or by damaging it physically.

Using racks of coral being transplanted as part of repopulation efforts, Hay and graduate student Douglas Rasher compared the fate of corals from two different species when they were placed next to different types of seaweed common around Fijian reefs in the Pacific – and Panamanian reefs in Caribbean. They planted the seaweeds next to coral being transplanted – and also placed plastic plants next to some of the coral to simulate the effects of shading and mechanical damage. Other coral in the racks had neither seaweeds nor plastic plants near them.

The researchers revisited the coral two days, 10 days and 20 days later. In as little as two days, corals in contact with some seaweed species bleached and died in areas of direct contact. In other cases, the effects took a full 20 days to appear – or for some seaweed species, no damaging effects were noted during the 20-day period. Ultimately, as much as 70 percent of the seaweed species studied turned out to have harmful effects – but only when they were in direct contact with the coral.

To confirm that chemical factors were responsible, Hay and Rasher extracted chemicals from the seaweeds – and from only the surfaces of the seaweeds. They then applied both types of chemicals to corals by placing the chemicals into gel matrix bound to a strip of window screen, forming something similar to a gauze bandage and applying that directly to the corals. To a control group of corals, they applied the gel and screen without the seaweed chemicals.

The effects confirmed that chemicals from both the surface of certain seaweeds and extracts from those entire plants killed corals.

“In all cases where the coral had been harmed, the chemistry appeared to be responsible for it,” said Hay. “The evolutionary reasons why the seaweeds have these compounds are not known. It may be that these compounds protect the seaweeds against microbial infection, or that they help compete with other seaweeds. But it”s clear now that they also harm the corals, either by killing them or suppressing their growth.” (ANI)

Ancient leaves shed light on future climate

Washington, May 7 (ANI): Scientists say that fossil plant remains from millions of years ago might shed light on future climate changes caused by rising levels of carbon dioxide.

“Carbon isotopes are really important for understanding the carbon cycle of the past, and we care about the carbon cycle of the past because it gives us clues about future climate change,” say Aaron Diefendorf, graduate student in geosciences at Penn State.

The researchers say that clues about how the environment responded to global warming events millions of years ago can be found in carbon isotope ratios from ancient fossil leaves, sediments and pollen.

However, environmental conditions also impact leaf carbon isotope ratios, a complexity Diefendorf and Mueller resolved with their study.

The researchers suggest the environmental relationships highlighted in their study can be used to modify existing climate records to produce a more accurate, robust account of past atmospheric conditions and how it correlates with temperature change.

The study appeared in a recent issue of the Proceedings of the National Academy of Sciences. (ANI)

Organic labels on snacks lead to overeating

Washington, April 29 (ANI): A new study has concluded that organic labels really do make people think their snack has a lot fewer calories than it really does, which ultimately leads to overeating.

Jenny Wan-Chen Lee, a graduate student with the Cornell Food and Brand Lab, said the study showed that people who ate organic cookies labelled as ‘organic’ believed that their snack contained 40 percent fewer calories than the same cookies that had no label.

Co-author, Brian Wansink, Cornell professor and author of the book, Marketing Nutrition, said: “An organic label gives a food a ”health halo.’”

“It”s the same basic reason people tend to overeat any snack food that”s labeled as healthy or low fat. They underestimate the calories and over-reward themselves by eating more,” he added.

These findings were presented at this week”s Experimental Biology conference in Anaheim, Calif. (ANI)

Breast milk, coconut oil-based face cream may help treat acne Home

Washington, Apr 17 (ANI): A face cream made from breast milk and coconut oil could cure acne, a new study claims.

A natural product found in both coconut oil and human breast milk – lauric acid – may offer treatment for acne, says a scientist.

The bioengineering graduate student from the UC San Diego Jacobs School of Engineering developed a “smart delivery system” – published in the journal ACS Nano in March – capable of delivering lauric-acid-filled nano-scale bombs directly to skin-dwelling bacteria (Propionibacterium acnes) that cause common acne.

Bioengineering graduate student Dissaya “Nu” Pornpattananangkul will present her most recent work on this experimental acne-drug-delivery system at Research Expo, the annual research conference of the UC San Diego Jacobs School of Engineering.

Ph.D. student Dissaya “Nu” Pornpattananangkul is developing a smart system of drug delivery.

Lauric-acid-based treatments could avoid these side effects, the UC San Diego researchers say.

“It’s a good feeling to know that I have a chance to develop a drug that could help people with acne,” said Pornpattananangkul, who performs this research in the Nanomaterials and Nanomedicine Laboratory of UC San Diego NanoEngineering professor Liangfang Zhang from the Jacobs School of Engineering.

The new smart delivery system includes gold nanoparticles attached to surfaces of lauric-acid-filled nano-bombs. The gold nanoparticles keep the nano-bombs (liposomes) from fusing together. The gold nanoparticles also help the liposomes locate acne-causing bacteria based on the skin microenvironment, including pH.

Once the nano-bombs reach the bacterial membranes, the acidic microenvironment causes the gold nanoparticles to drop off. This frees the liposomes carrying lauric acid payloads to fuse with bacterial membranes and kill the Propionibacterium acnes bacteria.

“Precisely controlled nano-scale delivery of drugs that are applied topically to the skin could significantly improve the treatment of skin bacterial infections. By delivering drugs directly to the bacteria of interest, we hope to boost antimicrobial efficacy and minimize off-target adverse effects,” said Zhang. “All building blocks of the nano-bombs are either natural products or have been approved for clinical use, which means these nano-bombs are likely to be tested on humans in the near future.” (ANI)

People make poor choices when armed with information

Washington, Apr 1 (ANI): People with complete information go for the instant reward, when given a choice between a quick payoff versus a longer-term benefit, U.S. researchers say.

The research from University of Texas at Austin psychologists has been published online in the journal Judgment and Decision Making.

“You”d think that with more information about your options, a person would make a better decision. Our study suggests the opposite,” says Associate Professor Bradley Love, who conducted the research with graduate student Ross Otto. “To fully appreciate a long-term option, you have to choose it repeatedly and begin to feel the benefits.”

As part of the study, 78 subjects were repeatedly given two options through a computer program that allowed them to accumulate points. For each choice, one option offered the subject more points. But choosing the other option could lead to more points further along in the experiment.

A small cash bonus was tied to the subjects” performance, providing an incentive to rack up more points during the 250 trial questions.

However, subjects who were given full and accurate information about what they would have to give up in the short term to rack up points in the long term, chose the quick payoff more than twice as often as those who were given false information or no information about the rewards they would be giving up.

In a real-life scenario, a student who stayed home to study and then learned he had missed a fun party would be less likely to study next time in a similar situation — even if that option provides more long-term benefits.

“Basically, people have to stay away from thinking about the short-term pains and gains or they are sunk and, objectively, will end up worse off,” says Love. (ANI)

Cell division in bacteria just like clockwork

Washington, March 19 (ANI): A new American study has found that cell division in cyanobacteria is controlled by same kind of circadian rhythms that govern human sleep.

The research conducted by scientists at MIT and the University of California at San Diego has appeared in the March 18 online edition of Science.

Previous research has demonstrated that although cyanobacteria do not “sleep” in the same way as humans, they cycle through active and resting periods on a 24-hour schedule. Cyanobacteria depend on sunlight for photosynthesis, so they are most active during the day.

The researchers showed, for the first time, how the circadian clock regulates the bacteria”s rate of cell division – their method of reproduction – in single cells.

Lead author Bernardo Pando, an MIT graduate student in physics, said: “These cells have to keep dividing, and the circadian oscillator regulates when they divide.”

In multicellular animals, including humans, cell division is crucial for renewal and repair, while out-of-control cell division causes cancer, so “understanding how cells are dividing is really of fundamental importance,” says Susan Golden, professor of molecular biology at the University of California at San Diego and an author of the paper.

Cyanobacteria maintain their circadian rhythms even when isolated from the naturally occurring daily light-dark cycles of the sun, just like humans. The scientists discovered that under conditions of moderate constant light, the cyanobacteria undergo cell division about once per day, and the divisions take place mostly at the midpoint of the 24-hour cycle.

To find how the cell division cycle is coupled to the circadian clock, the researchers sped up the cell cycle by boosting the intensity of light, enabling the cells to photosynthesize more, which increases the amount of energy available to them. The cells did start to divide more frequently, but in a pattern still linked to the circadian clock — they divided once a quarter of the way into the cycle, and again three-quarters into the cycle.

The research group also showed that the cyanobacteria enter a resting phase about 19 hours into the circadian cycle, after which they will not divide until the next cycle begins.

For the study, the researchers tracked single cells over a weeklong period. Proteins that govern the circadian clock were tagged with yellow fluorescent protein, so each cell”s position in the 24-hour cycle could be pinpointed. Photographs of the cells were taken every 40 minutes, so researchers could see when they divided.

This is the first time researchers have studied how cell cycle and circadian rhythms are coupled in individual bacterial cells.

Alexander van Oudenaarden, MIT professor of biophysics and senior author of the paper, said: “You can only do this by looking at single cells.”
(ANI)

End 2012 Said by Astronomer busts Mayan calendar’s dire prediction

Washington, Nov 14 (IANS) The world won’t be coming to an end on December 21, 2012, as said to be darkly predicted by the Mayan calendar, says an astronomer.

Ann Martin, doctoral candidate in Cornell University astronomy department, points out that the Mayan calendar was designed to be cyclical, so the fact that the long count comes to an end in December 2012 is really of no consequence.

Simply, it is the end of great calendar cycle in Mayan society, much like our modern society celebrated the new millennium. It does not mean that the ‘world will end’, says Martin.

In fact, the Mayan calendar does not end then and there is no evidence to suggest that the Mayans — or anyone for that matter — has knowledge of the world’s demise, says Martin.

For the past three years, Martin has been a volunteer with Cornell’s ‘Curious? Ask an Astronomer’ service, a website founded by astronomy graduate students in 1997, says a varsity release.

Curious? Ask an Astronomer features the answers to over 750 frequently asked astronomy questions, and readers who can’t find their answers there can submit a new question and receive an answer from a graduate student volunteer.

Open-source camera may help reinvent digital photography

Washington, September 4 (ANI): Stanford scientists may revolutionize digital photography with the aid of an open-source digital camera, which will give programmers around the world the chance to create software that will teach cameras new tricks.

Marc Levoy, professor of Computer Science and of Electrical Engineering, says if the technology catches on, camera performance will be no longer be limited by the software that comes pre-installed by the manufacturer.

He has revealed that virtually all the features of “Frankencamera” – focus, exposure, shutter speed, flash, etc. – are at the command of software that can be created by inspired programmers anywhere.

“The premise of the project is to build a camera that is open source,” said Levoy.

Graduate student Andrew Adams, who has helped design the prototype of the Stanford camera, imagines a future where consumers download applications to their open-platform cameras the way Apple applications are downloaded to iPhones today.

The camera’s operating software is expected to be publicly available in a year.

Users will be able to continuously improve it, along the open-source model of the Linux operating system for computers or the Mozilla Firefox web browser.

Programmers will have the freedom to experiment with new ways of tuning the camera’s response to light and motion, adding their own algorithms to process the raw images in innovative ways.

Levoy’s plan is to develop and manufacture the “Frankencamera” as a platform that will first be available at minimal cost to fellow computational photography researchers.

Within about a year, after the camera is developed to his satisfaction, Levoy hopes to have to have the funding and the arrangements in place for an outside manufacturer to produce them in quantity, ideally for less than 1,000 dollars. (ANI)

Now, a smart home that can alert owner about a stove burner left on

London, Sep 3 (ANI): Ever thought that your home would tell if you have left a stove burner on after making your breakfast? Well, it is now possible, thanks to the new sensor-stuffed apartment created by researchers at Washington State University in Pullman.

The smart home, known as Casas, developed by Diane Cook and colleagues, can learn the ways of its inhabitants by observing their daily habits and how they use different appliances everyday.

The technology could be used in houses to support people with cognitive difficulties or dementia with their daily living needs, or to make things easier for healthy people.

For example, the apartment can recognise when a person is performing actions associated with making breakfast and can prompt them with audio and video signals to warm them of any anomaly like a stove left burning.

While Casas was developed to analyse the sensors’ output, Graduate student Parisa Rashidi has improved the system, so that it can learn a person’s habits without prior assumptions about what events or patterns to expect.

While previous smart homes used movie cameras to pre-define key activities before recognising them, the new system was successfully tested in a specially outfitted apartment with a single resident on campus.

It required around a month of training to accurately tease out the resident’s habits from the sea of sensor data, said Rashidi.

Once trained, Casas can identify patterns as complex as “at 6 am the kitchen light comes on, the coffee maker turns on, and the toaster turns on” without any prior knowledge of what to expect.

To maintain a resident’s sense of privacy Casas works without cameras, RFID chips or microphones.

Instead less “invasive” sensors that detect motion, temperature, light, humidity, water, door contact and the use of key items, such as opening a bottle of medication or switching on the toaster.

“We don’t want to give residents the feeling that Big Brother is watching them,” New Scientist quoted Rashidi as saying.

The researchers developed a number of data-mining algorithms to help make sense of the sensor output.

One algorithm uses a grid of motion sensors to map out how a person walks around the home, looking for daily “trajectories”, or routes through the house.

A second algorithm finds patterns in a sequence of events, such as learning to expect the resident to turn on a tap after turning on the oven.

And a third algorithm looks to correlate events it detects with the time of day to identify the pattern, for example, of when the person eats dinner.

Now the researchers are working on upgrades that allow the apartment to decipher the actions of multiple inhabitants and recognise subtle variations in commonly repeated tasks.

The study has been published in the journal IEEE Transactions on Systems Man and Cybernetics. (ANI)

Scientists create platinum nanocatalyst for industrial use by drug makers

Washington, September 1 (ANI): Rice University chemists have created a polymer-coated version of gold-platinum nanorods that can be used in the organic solvents favoured by chemical and drug manufacturers.

This work attains significance because, to date, chemists have struggled to create nanoparticles combining platinum and gold-which act as super-efficient catalysts-in an industrially useful form.

Catalysts are compounds that speed up or slow down chemical reactions without being consumed by them. The chemical and drug industries spend billions of dollars each year for catalysts that are needed to process drugs and other high-value chemicals.

“There are some industrial reactions where drugmakers have no choice but to use platinum and palladium catalysts, but the majority of these are homogenous, which means they mix readily with reactants and are very difficult to remove,” said lead researcher Eugene Zubarev, associate professor in chemistry at Rice.

“Because these heavy metals are toxic, they must be completely removed from the drug after its synthesis is completed. However, the removal of homogeneous catalysts is very time-consuming and expensive, which creates a big problem for pharmaceutical companies,” Zubarev added.

Zubarev and Rice graduate student Bishnu Khanal revealed that they wanted to make a heterogeneous platinum catalyst that was soluble enough for industrial use, but that could also be easily removed.

They already knew from previous studies that combining platinum with gold in tiny nanoparticles could enhance the platinum’s catalytic effect. Thus, they started with tiny rods of pure gold. and coated them with a layer of platinum so thin that it left the gold exposed in some places.

Having confirmed the structure of the gold-platinum nanorods, the researchers then set out to find a way to make them soluble in organic solvents that are favoured by industry.

Building on Zubarev’s previous work in making soluble gold nanorods, they found a way to attach hair-like molecules of polystyrene to the surface of the gold-platinum rods.

Zubarev and Khanal found the coated particles were easy to remove from solution with a conventional centrifuge, and that the polystyrene shells made them completely soluble in organic solvents and dramatically enhanced their catalytic selectivity.

“The selectivity of the coated gold and platinum nanorods will be very attractive to industry. For example, we found they had nearly 100 percent catalytic selectivity for the hydrogenation of terminal olefins,” Zubarev said.

The researchers are using similar methods to produce gold-palladium catalysts in a follow-up study. Palladium is another high-demand catalyst.

“The early indications are very promising,” he said.

A research article on this work has been published in the German scientific journal Angewandte Chemie International Edition. (ANI)

Some Aussie frogs raise pitch of love songs to counter traffic noise

Washington, Aug 26 (ANI): Some Aussie frogs often raise their pitch as they serenade their partners, in order to counter traffic sounds, according to a study.

Kirsten Parris, an ecologist at the University of Melbourne, says that one species of frog in Melbourne is changing the pitch of its love song to be heard above the roar of the road.

For the study, Parris visited many urban ponds and pools inhabited by frogs, measuring traffic noise, which is, unfortunately, at the same low frequencies as many frog mating calls.

But, for the onomatopoeic ‘pobblebonk’ (Limnodynastes dumerilii), she found that a call that could originally be heard by a female 800 metres away might only carry 98 metres above 60 decibels of traffic noise, an average value for Melbourne.

She has also discovered that the southern brown tree frog (Litoria ewingii) seems to be compensating for the traffic noise by increasing the pitch of its calls1 (listen to before and after calls).

Parris suggested that installing noise barriers at strategic points around a road could help urban frogs to hear each other.

She further said that creating habitats where they thrive – such as ponds with sloping rather than steep sides – would also make sense.

“Cities provide some of the last habitat for a range of frog species around the world. So if we only worry about conserving frogs and their habitats outside cities, some of these frogs may well go extinct,” she said.

She added: “Some frog species are very sensitive to environmental changes”, but “others are quite adaptable and can persist in urban habitats if we gave them a bit of help”.

However, Kris Kaiser, an ecology graduate student at the University of California, Los Angeles, has put forward a note of caution on the subject of these amphibians’ adaptability.

“Frogs, unlike birds, are thought to have the frequency of their calls somewhat constrained by their anatomy. There is often a relationship between body size and frequency of call,” he said.

Thus, he claimed that the creatures’ ability to compensate for traffic noise may be limited.

The study was presented at the International Congress of Ecology in Brisbane. (ANI)

Dedicated employees have happier home life: Study

Washington, Aug 25 (ANI): Employees who are invigorated and dedicated have a happier home life, according to a new Kansas State University study.

The researchers studied how positive work experiences extend into family life and facilitate family interactions.

They found that employees who are engaged in their work, which includes higher levels of vigour, more dedication and absorption in daily activities, have better moods and more satisfaction at home.

The research team involved Clive Fullagar, professor of psychology; Satoris Culbertson, assistant professor of psychology; and Maura Mills, graduate student in psychology, Manhattan.

“Our research indicated that individuals who were engaged in positive experiences at work and who shared those experiences with significant others perceived themselves as better able to deal with issues at home, became better companions and became more effective overall in the home environment,” Culbertson said.

The researchers tracked 67 extension agents for two-weeks to determine the relationship between daily work engagement and work-to-family facilitation.

The participants responded to two daily surveys, one at the end of their workday and the other immediately before going to bed for the night.

They also completed a separate survey prior to the start of the two-week period and another after the daily data collection had ended.

Culbertson said stress at work and stress at home interact in ways that affect outcomes in both domains.

The study results suggested that engagement is significantly related to daily mood, and mood also is positively correlated with work-family facilitation.

The researchers found that both work engagement and work-to-family facilitation vary considerably from day-to-day.

“Just because an employee might not be invigorated or dedicated to his or her work on a Monday doesn’t mean he or she won’t be engaged on Tuesday or vice versa,” Culbertson said.

“Additionally, one’s work can facilitate things at home to a different extent depending on the day and what has happened on that particular day,” Culbertson added.

The researchers also found that daily work engagement had a positive effect on family life after controlling for workload – heavy or light work hours were not a factor.

Culbertson stressed that engagement refers to positive work involvement rather than more negative forms of job involvement like workaholism and work addiction, which differ in their effects on home lives.

“Work addicts, or workaholics, have been shown to experience higher levels of work-family conflict. On the contrary, our study showed that higher levels of engagement were related to higher levels of work-family facilitation rather than conflict,” Culbertson said.

The research has been presented at the annual conference for Society for Industrial and Organizational Psychology in New Orleans. (ANI)

How women judge facial attractiveness when it comes to potential mates

Washington, August 25 (ANI): Psychologists have shed new light on how women judge facial attractiveness when it comes to choosing potential mates.

“We have found that women evaluate facial attractiveness on two levels-a sexual level, based on specific facial features like the jawbone, cheekbone and lips, and a nonsexual level based on overall aesthetics. At the most basic sexual level, attractiveness represents a quality that should increase reproductive potential, like fertility or health,” said Robert G. Franklin, graduate student in psychology working with Reginald Adams, assistant professor of psychology and neurology, Penn State.

The researcher points out that attractiveness, on the nonsexual side, can be perceived on the whole, where brains judge beauty based on the sum of the parts they see.

“But up until now, this (dual-process) concept had not been tested,” Franklin said.

With a view to determining how women use such methods of determining facial attractiveness, the psychologists showed fifty heterosexual female college students a variety of male and female faces.

The participants were asked to rate what they saw as both hypothetical dates and hypothetical lab partners on a scale of one to seven.

Franklin has revealed that the first question was designed to invoke a sexual basis of determining attractiveness, while the second was geared to an aesthetic one.

According to him, this part of the experiment served as a baseline for next phase.

The same faces were later shown to another set of fifty heterosexual female students. Some of the faces, however, were split horizontally, with the upper and lower halves shifted in opposite directions.

The scientists asked the participants to rate the overall attractiveness of the split and whole faces on the same scale.

By dividing the faces in half and disrupting the test subjects’ total facial processing, the researchers believed that women would rely more on specific facial features to determine attractiveness.

They thought that this sexual route would come into play particularly when the participants saw faces that were suited as hypothetical dates rather than lab partners, and the study showed exactly that.

“The whole face ratings of the second group correlated better with the nonsexual ‘lab partner’ ratings of the first group,” Franklin said.

He revealed that, with the faces intact, the participants could evaluate them on an overall, nonsexual level.

“The split face ratings of the second group also correlated with the nonsexual ratings of the first group when the participants were looking at female faces. The only change occurred when we showed the second group split, male faces. These ratings correlated better with the ‘hypothetical date’ ratings of the first group,” he added.

The bottom line is that, at a statistically significant level, splitting the faces in half made the women rely on a purely sexual strategy of processing male faces.

The study verifies that these two ways of assessing facial appeal exist, and can be separated for women.

“We do not know whether attractiveness is a cultural effect or just how our brains process this information. In the future, we plan to study how cultural differences in our participants play a role in how they rate these faces. We also want to see how hormonal changes women experience at different stages in the menstrual cycle affect how they evaluate attractiveness on these two levels,” Franklin said.

It has been known for long that women’s biological routes of sexual attraction derive from an instinctive reproductive desire, relying on oestrogen and related hormones to regulate them.

Scientists have also known that the overall aesthetic approach is a less reward-based function, driven by progesterone.

How this complex network of hormones interacts and is channelled through the conscious brain and the human culture that shapes it is a mystery.

“It is a complicated picture. We are trying to find what features in the brain are at play, here,” Franklin said.

The study’s findings have been reported in the Journal of Experimental Social Psychology. (ANI)

Our nostrils share a ‘smelly’ rivalry

Washington, Aug 21 (ANI): Our nostrils may look like a happy pair, but according to a new study, when they pick up conflicting scents, the nose holes become deadly rivals.

The study, published online in Current Biology, a Cell Press publication, explains that when the nose encounters two different scents simultaneously, the brain processes them separately through each nostril in an alternating fashion.

The finding by researchers at Rice University in Houston is the first demonstration of “perceptual rivalry” in the olfactory system.

“Our discovery opens up new avenues to explore the workings of the olfactory system and olfactory awareness,” said Denise Chen, assistant professor of psychology, who coauthored the research paper with graduate student Wen Zhou.

For the study, 12 volunteers sampled smells from two bottles containing distinctively different odors. One bottle had phenyl ethyl alcohol, which smells like a rose, and the other had n-butanol, which smells like a marker pen.

The bottles were fitted with nosepieces so that volunteers could sample both scents simultaneously-one through each nostril.

During 20 rounds of sampling, all 12 participants experienced switches between smelling predominantly the rose scent and smelling predominantly the marker scent. Some experienced more frequent and drastic switches than others, but there was no predictable pattern of the switch across the whole group of volunteers or within individuals.

Chen said this “binaral rivalry” between the nostrils resembles the rivalry that occurs between other pairs of sensory organs.

When the eyes simultaneously view two different images-one for each eye-the two images are perceived in alternation, one at a time. And when alternating tones an octave apart are played out of phase to each ear, most people experience a single tone that goes back and forth from ear to ear.

In the laboratory setting in which each nostril simultaneously received a different smell, the participants experienced an “olfactory illusion,” she said.

“Instead of perceiving a constant mixture of the two smells, they perceive one of the smells, followed by the other, in an alternating fashion, as if the nostrils were competing with one another. Although both smells are equally present, the brain attends to predominantly one of them at a time,” the expert added.

“The binaral rivalry involves adaptations at the peripheral sensory neurons and in the cortex,” Chen said.

“Our work sets the stage for future studies of this phenomenon so we can learn more about the mechanisms by which we perceive smells,” the expert said.

In binaral rivalry, the tug-of-war between dominance and suppression of the olfactory perception exists only in the mind of the person who smells the odors, while the physical properties of the olfactory stimuli remain unchanged, Chen said. This gives humans the rare opportunity to dissociate olfactory perception and physical stimulation. (ANI)

Migratory birds not choosy about selecting their rest stops

Washington, August 13 (ANI): A new study Purdue University study researchers has found that migratory birds are not choosy about selecting their rest stops.

In the study, John Dunning, an associate professor of forestry and natural resources, Purdue University, found that migrating birds are just as likely to stop in small woodlots in the middle of an agricultural field for the night as stopping by a lush, protected forest, provided there is adequate protection and food.

Dunning said the finding suggests that conservation efforts should extend to smaller forested lands to help stabilize declining migratory bird populations.

“There are strategies for conserving forest for migratory birds, but those strategies emphasize the largest patches of forest,” he said.

“We found that even very small woodlots were filled with migratory birds at times. It makes us believe we also need to conserve the little patches of forest, not just the big ones,” he added.

Dunning and graduate student Diane Packett observed woodlots at three distances from Indiana’s Wabash River and its tributaries – within half a kilometer, between one and five kilometers and at about 20 kilometers.

The woodlots were less than 20 acres and had row crops surrounding them on at least three sides.

There were 76 different species of migratory birds found in the woodlots, with no statistical differences in the number of species or overall population of birds based on distance from streams.

According to Packett, the birds, which travel thousands of miles between South and Central America and Canada twice each year, sometimes just need a place to stop along their journey.

As forests have been cleared for development, agriculture and other uses, those birds have to make do with whatever patches of forest they can find when they become tired or encounter bad weather.

“They don’t make the trip all in one jump. It can be thousands of miles they have to fly,” Packett said. “They need safe places to stop, eat and rest. If they don’t have that, they might not survive,” she added.

Dunning said the findings are especially timely since smaller forested areas may be in danger because of increased manufacturing of ethanol.

Dunning said he would like to use radio transmitters on birds that gather in small woodlots to see how long they stay in the areas and to pinpoint other important stopovers migratory birds use. (ANI)

New ragging case surfaces in HP

Shimla, July 15 (ANI): A new ragging case surfaced in Himachal Pradesh on Wednesday when a post graduate student alleged that he was ragged by some seniors of the college.

According to the officiating Principal of Bilaspur Post Graduate College, Ashok Awasthi, the first year student Surya Chandel submitted a written complaint stating that he was ragged by his seniors.

The student in his complaint alleged that on Friday last some seniors along with few outsiders fired some unpleasant questions on him and when he resisted they slapped him.

Awasthi said that the college administration has forwarded the matter to the college anti-ragging committee to ascertain the facts.

An FIR has been registered with Bilaspur Sadar police station on Tuesday on the basis of complaint letter forwarded by the college and investigation is on, Superintendent of Police Bilaspur Kuldeep Singh said.

Singh said the case has been registered under relevant sections of the anti-ragging ordnance brought by the state government in the wake of death of Aman Kachroo due to ragging in Dr Rajendra Prasad government Medical College Tanda in Kangra district in March.

Based on the report of the committee appropriate steps would be initiated by the college against the guilty, the officiating Principal said. (ANI)