Microbes ,stock exchange, bit coins

Even microbes have a Dalal Street

NEW YORK: Ever heard of a biological market where microbes set up shops, bid and fight for a better trading partner?

Sounds crazy but according to a new study, microbes in our body set up their own markets, compare bids for commodities, hoard to obtain a better price and generally behave in ways share traders do at Dalal Street.

"We have long been aware that trades among a wide range of organisms are not blind exchanges but instead ones shaped by 'market conditions' such as price, quality and competition," said Joan Strassmann, professor at Washington University in Missouri, US.

"Single-celled organisms had been shown to avoid bad trading partners, build local business ties, diversify or specialize in a particular commodity, save for a rainy day, eliminate the competition and otherwise behave in ways that seem to follow market-based principles," he added.

They even foresee practical applications of the work. It might be possible, for example, to manipulate 'market conditions' in crop fields to drive nitrogen-fixing bacteria to trade more of their commodity - a biologically available form of nitrogen - with crop plants, said the study that appeared in the journal Proceedings of the National Academy of Sciences.

"The microscopic nature of microbial systems means it is easy to misunderstand their interactions. An economic framework helps us focus on what is important," said David Queller from Washington University.

"For biological markets to evolve, you actually only need that individuals can detect co-operators and respond by rewarding them with more resources," said Gijsbert Werner, a doctoral candidate at Vrijie Universiteit in Amsterdam, The Netherlands.

The researchers found that the fungi compare the resources on offer by different plants, and adjust their resource allocations accordingly.

Some fungi even hoard resources until they get a better deal, the study added.


Sam Berns, teen who battled 'accelerated aging' disease, dead at 17



Sam Berns, teen who battled 'accelerated aging' disease, dead at 17
Berns was diagnosed with progeria when he was 22 months old. (Photo by Andrew H. Walker/Getty Images)
MASSACHUSETTS: Seventeen-years-old Sam Berns, whose battle with a rare genetic condition that accelerates the aging process became the subject of an HBO documentary has died.

Berns, of Foxborough, Massachusetts, died on Friday after complications from Hutchinson-Gilford progeria syndrome, commonly known as progeria. The Progeria Research Foundation, which was founded by his parents, announced his death.

Berns was diagnosed with progeria when he was 22 months old. His parents founded the nonprofit foundation after encountering a lack of information and research on the condition, whose victims live an average of 13 years.

The work by his parents, Leslie Gordon and Scott Berns, who are doctors, on behalf of progeria patients is featured in the documentary " Life According to Sam.'' The exposure has brought greater recognition to the condition, which causes musculoskeletal degeneration, cardiovascular problems and other symptoms associated with aging.

New England Patriots owner Robert Kraft mourned Berns' death, saying he had invited the teen to be the football team's honorary captain for Saturday night's playoff game against the Indianapolis Colts and was looking forward to spending time with him and his family.

"I loved Sam Berns and am richer for having known him,'' Kraft said in a statement Saturday.

Kraft, after being introduced to Berns and attending the HBO premiere of the documentary in New York in October, made a $500,000 matching pledge to the foundation. Berns, a sports fan who was invited to a Patriots practice that month, gave the players an impromptu motivational speech, the Boston Globe reported.

Berns was asked to name his favorite player. He didn't have one. It takes a team to succeed, he said.

Ultrasound can boost sensory performance: Study

Ultrasound can boost sensory performance: Study
Scientists at Virginia Tech Carilion Research Institute have demonstrated that ultrasound directed to a specific region of the brain can boost performance in sensory discrimination.
WASHINGTON: Ultrasound can modulate brain activity to heighten sensory perception in humans, says a study.

Scientists at Virginia Tech Carilion Research Institute have demonstrated that ultrasound directed to a specific region of the brain can boost performance in sensory discrimination.

The study provides the first demonstration that low-intensity, transcranial-focused ultrasound can modulate human brain activity to enhance perception.

"Ultrasound has great potential for bringing unprecedented resolution to the growing trend of mapping the human brain's connectivity," said William 'Jamie' Tyler, assistant professor at Virginia Tech Carilion Research Institute.

"So we decided to look at the effects of ultrasound on the region of the brain responsible for processing tactile sensory inputs," he said.

The scientists delivered focused ultrasound to an area of the cerebral cortex that processes sensory information received from the hand, said the study published in Nature Neuroscience.

To stimulate the median nerve - a major nerve that runs down the arm and the only one that passes through the carpal tunnel - they placed a small electrode on the wrist of human volunteers and recorded their brain responses using electroencephalography, or EEG.

Then, just before stimulating the nerve, they began delivering ultrasound to the targeted brain region.

The scientists found that the ultrasound both decreased the EEG signal and weakened the brain waves responsible for encoding tactile stimulation.

The scientists then administered two classic neurological tests - the two-point discrimination test that measures a subject's ability to distinguish whether two nearby objects touching the skin are truly two distinct points, rather than one.

The second is the frequency discrimination task - a test that measures sensitivity to the frequency of a chain of air puffs.

They found unexpected results.

The subjects receiving ultrasound showed significant improvements in their ability to distinguish pins at closer distances and to discriminate small frequency differences between successive air puffs.

"Even though the brain waves associated with the tactile stimulation had weakened, people actually got better at detecting differences in sensations," said Tyler, adding that the ultrasound affected an important neurological balance.

"We believe focused ultrasound changed the balance of ongoing excitation and inhibition processing sensory stimuli in the brain region, resulting in a functional improvement in perception, he added.

"This approach can be used for potential treatments of neurodegenerative disorders, psychiatric diseases and behavioural disorders, the study said.
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