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Russian PM's Twitter account hacked

Written By Unknown on Kamis, 14 Agustus 2014 | 23.34

14 August 2014 Last updated at 11:54 By Joe Miller Technology reporter

The Twitter account of Russia's prime minister was hacked on Thursday. The infiltrators posted a message saying Dmitry Medvedev had resigned.

The Russian-language feed, which has more than 2.5 million followers, was also filled with tweets denouncing the country's president, Vladimir Putin.

The impersonator wrote that Mr Medvedev would be pursuing a new career as a freelance photographer.

A Russian hacking collective has claimed responsibility for the attack.

The government quickly confirmed the account had been hacked.

"I resign. I am ashamed of the government's actions. I'm sorry," the infiltrators initially wrote, following it up with tweets saying that electricity would be banned, and that Vladimir Putin was "wrong".

'iPhones hacked'

Shaltay-Boltay, a Russian hacking collective, has said it carried out the attack.

The group, whose name is Russian for Humpty Dumpty, also claimed it had infiltrated the Gmail account and iPhones of the prime minister.

Following the incident, it tweeted: "Several mail accounts - including the Gmail - and the content of three iPhones of a certain prime minister have randomly fallen into our hands on the internet. Details later."

Mr Medvedev's English-language Twitter account did not appear to be affected by the attack.

Analysis: Adam Robinson, BBC Monitoring

Since surfacing last December, Shaltay-Boltay has become Russia's best known hacking collective - as well as something of a thorn in the authorities' side.

Its fame rests on a track record of publishing internal Kremlin documents, including leaking President Putin's New Year's speech ahead of time last year.

Last month, Shaltay-Boltay published private emails allegedly belonging to a the head of a Kremlin-inspired "trolling" campaign, tasked with filling the comments sections of Western news websites with pro-Putin messages.

Other coups include leaking what it said were private emails of the Russian rebel commander in eastern Ukraine, Igor Girkin (aka Strelkov), apparently discussing separatist plans as far back as 2010, as well as purported Kremlin instruction notes telling Russia's main TV stations how to cover big stories.

Its Twitter account describes the group as an affiliate of global hacker collective Anonymous International.

Shaltay-Boltay's status as a serious irritation for the powers-that-be appeared to be confirmed out when Russia's internet censor Roskomnadzor blocked the group's blog on 23 July.


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Michael J Fox charity turns to tech

13 August 2014 Last updated at 18:46 By Leo Kelion Technology desk editor

The Michael J Fox Foundation is attempting to use wearable sensors to monitor the symptoms of Parkinson's disease.

The charity has teamed up with Intel to equip patients with smartwatches made by the tech firm's Basis division.

The organisations carried out tests earlier in the year and now plan to release an app to help doctors study the effects of different medications.

The effort has been given a cautious welcome by other researchers.

The actor Michael J Fox created his New York-based foundation in 2000 after being diagnosed with the degenerative neurological disorder.

It is believed that Parkinson's is brought on by a mixture of genetic and environmental factors, but the exact cause is still unknown.

Its symptoms can include tremors and other uncontrollable movements, impaired balance and co-ordination, stiffness, slowness of movement, loss of smell, a decline in intellectual functioning, and speech and swallowing problems.

It is estimated to affect about five million people worldwide and usually, but not always, occurs in old age.

The link-up with Intel came about through the tech firm's former chief executive Andy Grove, who serves as a senior advisor to the foundation and has been diagnosed with Parkinson's himself.

"This opportunity really will allow us the chance to uncover novel breakthroughs in Parkinson's disease by truly understanding how people are living with the disease today, how are they responding to treatments, what are their unmet needs," said Todd Sherer, chief executive of the foundation.

Record-keeping app

The wearables study is intended to provide researchers with more accurate data than can be obtained via traditional, subjective methods.

A preliminary test was funded by the two organisations earlier this year that equipped 16 Parkinson's patients and nine control volunteers with the devices for four days.

The watches allowed more than 300 data points to be recorded every second, translating to one gigabyte of data per patient a day. The information was then uploaded to Intel's system by a smartphone carried by those involved.

Over the period the participants kept paper-and-pen diaries and attended two clinical visits where they engaged in tests designed for the disease.

Intel data scientists are still processing the findings.

In addition to checking that the wearable tech's records correlate with those taken by the parties involved, they aim to develop algorithms that will allow body movement symptoms and sleep patterns to be automatically measured and made available for review in real time.

The next phase of the study involves releasing an app that allows patients to record how they are feeling and to report their medication intake, to help scientists measure the efficacy of the drugs and inform medics when they are deciding prescriptions.

This stage of the trial will be carried out in Boston, New York and Israel.

"We're looking for the accelerometer data," Ronald Kasabian, general manager of big data solutions at Intel, told the BBC.

"We want to be able to understand gait, fluidity of movement, tremors.

"The researchers are dying for the insight. The ability to see what is happening to the patient on a minute-by-minute, 24 hours a day, 365 days a year basis - the tremors, the sleep habits - to see that in real time will be one of the most eye-opening opportunities."

Intel said it would encrypt and anonymise the data to safeguard patients' privacy.

It added that the intention was to eventually open up the platform to other research centres and wearable devices.

'Years not decades'

Parkinson's UK welcomed the development, but cautioned that it was too soon to know how useful the results would be.

"The potential of using new technology to aid clinical decision making and help people with Parkinson's to get the right treatment is exciting," Suma Surendranath, professional engagement manger at the charity, told the BBC.

"However, it would be crucial that any device should demonstrate its effectiveness in robust clinical trials before becoming more widely available.

"New technology that has been proven to accurately represent the complexity of symptoms of people with Parkinson's could be a very useful addition to the tools currently available to professionals."

The Michael J Fox Foundation acknowledged that the study was still at an early stage, but it said it still believed a sensor-driven platform could be delivered within "years and not decades" to allow doctors to better tailor treatments to each patient.

"What happens is that you have 'on-off' periods as a patient," explained Sohini Chowdhury, senior vice president of research partnerships at MJFF.

"When you're 'on', your medication is working, you're able to move, you're able to do the tasks you want. When you are 'off' you are basically frozen, you can't do anything.

"The question treating physicians tackle with is: 'Are we giving you the optimal dose to be able to get you the right amount of on-off time during the day?"

Health tech

Several other major tech firms have also announced plans to become more involved with health tracking tech.

In May, Samsung unveiled Simband, a prototype wristband that can be fitted with third-party sensors to gather a range of data about the wearer's body that would then be shared with a platform called Sami (Samsung Architecture Multimedia Interactions).

Then in June, Apple unveiled HealthKit - an app for its forthcoming iOS 8 operating system that is designed to gather data from a wide range of third-party sensors, which can contact health professionals if it notices irregularities.

Later the same month, Google announced Google Fit, the Android-maker's own software to amass heath-related data from other services and devices.


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Ask.fm sold after cyberbullying row

14 August 2014 Last updated at 14:30 By Joe Miller Technology reporter
Doug Leeds

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Ask.com boss Doug Leeds says he wants to "eliminate" bullying from Ask.fm

The controversial social network Ask.fm has been bought by the owners of Tinder and Ask.com for an undisclosed fee.

The site, where members answer questions posed by others, has been linked to teenage suicides in the UK and elsewhere and has been criticised for not doing enough to prevent cyberbullying.

IAC, the US company behind the deal, said it would invest "millions" into improving safety on the site.

Ask.fm's founders will leave the firm.

The New York state attorney general, Eric Schneiderman, announced a safety agreement with the new owners.

"Under the terms of the agreement, Ask.fm will revamp its safety policies and procedures," his office said in a statement.

It said Ask.fm had committed to dealing with user complaints within 24 hours and removing users that have been the subject of multiple complaints.

"An independent safety and security examiner will be appointed to examine the changes and report on compliance to the Attorney General's Office for three years," the statement added.

Public criticism

The company was started in 2010 by two Latvian brothers, Ilja and Mark Terebin. It now boasts 180 million monthly users - almost two-thirds the size of rivals Twitter - with roughly 700 posts made each second.

The site, which is very popular among young adults, came under fire last summer following the suicide of 14-year-old Hannah Smith, when it was claimed that abusive comments seen on Ask.fm had contributed to her death.

Similar stories soon surfaced, and the Riga-based firm was heavily criticised for not adequately policing its site. It has also been denounced for hosting pages belonging to Islamic extremists fighting in Syria and Iraq, who had used Ask.fm as a recruiting tool.

Continue reading the main story

INTERACTIVE

  • ×

    Ask.fm is set up by brothers Ilja and Mark Terebin as a rival to question and answer based social network Formspring.

  • ×

    Privacy settings introduced to Ask.fm, including the option to disable anonymous questions.

  • ×

    Ciara Pugsley, 15, is found dead in woodland near her home in County Leitrim, Ireland. This was the first of several teen suicides linked to abuse via ask fm.

  • ×

    Hannah Smith, 14, is found hanged at her home in Lutterworth, Leicestershire. It is believed she killed herself after she was bullied on the site.

  • ×

    Prime Minister David Cameron urges people to boycott sites which do not 'step up to the plate' and tackle online abuse. He said that after the 'absolutely tragic' death of Hannah Smith, those running the websites had to 'clean up their act'.

  • ×

    Changes made to make Ask.fm safer in the wake of online bullying cases. It said it would view all reports within 24 hours, make the report button more visible, and include bullying and harassment as a category for a report.

  • ×

    In the 2013 Annual Cyberbullying Survey by charity Ditch the Label, Ask.fm is named as one of the three most likely places teenagers experience cyberbullying, alongside Facebook and Twitter.

  • ×

    Ask.fm launches a 'Safety Center' containing advice and guidance for users of the site and their parents.

The network's new owners, IAC, say they are committed to improving child safety and will pour millions of dollars into hiring more moderators and installing better detection systems.

"We wouldn't be getting involved if we didn't think we could make it safer," said Doug Leeds, chief executive of Ask.com, the IAC subsidiary behind the deal.

Analysis, Rory Cellan-Jones, technology correspondent

Why would anyone want to buy a brand as toxic as Ask.fm?

It's probably best known - among adults at least - as the social network that David Cameron wanted to see boycotted over cyberbullying.

I understand that Ask.com first got interested in the site when it started legal action to protect its own brand from contamination.

Then the US firm and its parent group saw just how big and engaged an audience the Latvia-based network had, and began to wonder about a different course of action.

Now the new owners need to move quickly to prove they can to make Ask.fm a safe place for its young users without annoying them so much that they head elsewhere.

What they have is the financial firepower which the buccaneering Latvian founders lacked - it's just that much easier to build and grow a web business in the United States than in Europe.

Mr Leeds added that under new leadership, Ask.fm would pledge to deal with safety complaints within 24 hours.

The site would do so by expanding the existing team of 60 staff, he said.

IAC has also recruited Annie Mullins, a member of the UK government's task force on child protection on the internet, to help improve safety at Ask.fm, as well as Catherine Davis Teitelbaum, who previously worked on safety policy at Yahoo.

Ask.com, known as Ask Jeeves in the UK, is owned by the New York firm InterActiveCorp, also known as IAC.

IAC owns several popular internet brands, including:

  • About.com
  • CollegeHumor
  • Dictionary.com
  • Investopedia
  • Match
  • OkCupid
  • The Daily Beast
  • Tinder
  • Urbanspoon
  • Vimeo

In making the deal, Ask.com has joined forces with the venture capitalists (VCs) behind Ask.fm, who retain a minority stake in the firm.

"Our intentions for the company aligned with the VC's," said Mr Leeds.

The founders, who operated under what Mr Leeds terms a "philosophy that's different than ours" have been effectively bought out, and will no longer be involved with Ask.fm

"They had a laissez-faire, libertarian attitude," Mr Leeds added, emphasising that under the new regime, threats of violence and other distressing content would "not be welcome".


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Bribery hotline 'traps Delhi police'

13 August 2014 Last updated at 13:35

Five policemen in India are being investigated for alleged corruption after officials received complaints on a newly-launched helpline number.

Since its launch on 6 August, the helpline has received more than 3,700 WhatsApp messages and 622 calls.

Officials said they had received two video and three audio messages and were investigating the reported incidents.

Correspondents say there have long been allegations of corruption in the Delhi police force - and the rest of India.

Delhi police commissioner BS Bassi last week launched a new helpline number [9910641064], asking the public to send audio or video messages via the instant messaging service WhatsApp "if any cop seeks a bribe or harasses a person".

Advertisements were taken out in popular Hindi and English newspapers as well as on FM radio channels to make people aware about the new helpline.

The "response from the public has been good", deputy commissioner of police Sindhu Pillai told the BBC.

Ms Pillai is part of the vigilance department which investigates policemen after complaints of bribery, corruption, bad behaviour with complainants and inaction on complaints.

"Most of the messages we have received so far are from people wanting to know about this service, but we have also received some complaints," she said.

"Once we get an audio or video clip, we ask the complainant to come to our office and give a written complaint. We get the recording checked at the forensic science laboratory to make sure its genuine and once the authenticity is established, action is taken against the errant policeman."

Of the five video and audio files received on the helpline, Ms Pillai said her department had initiated action in two cases, involving five policemen, for demanding - and accepting - bribes.

In the first case, a complainant sent a video recording of an assistant sub-inspector receiving a bribe of 400 rupees ($6.5; £3.9) while in the second incident, an audio recording revealed four policemen demanding and accepting bribes from a shopkeeper over a period of a year.

"We have registered cases against the erring police officers under India's Prevention of Corruption Act and action has been initiated against them," Ms Pillai said.

The policemen have been suspended.

WhatsApp is hugely popular in India because it is easy to use and carries no advertisements.

The service is available on Apple, Android and Blackberry platforms and it's very cheap.

The messaging service is used by about 500 million people globally and estimates say nearly a tenth of its users are in India.


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Samsung reveals metal-framed phone

13 August 2014 Last updated at 11:35 By Leo Kelion Technology desk editor

Samsung has announced a new smartphone with a metal frame that is smaller and thinner than its flagship model.

The South Korean company describes the Galaxy Alpha as representing a "new design approach".

The firm has previously been criticised for the plastic feel of its handsets at a time when other firms have opted to use materials marketed as having a "premium" feel.

Samsung Electronics saw a 20% year-on-year drop in its last quarter's profit.

It blamed "slow global sales of smartphones".

The company recently lost its status as China's bestselling smartphone-maker to Xiaomi, a local rival, according to the research group Canalys.

Xiaomi's latest handset, the Mi 4, also features a metal-framed build.

"This is a clear acknowledgement by Samsung that it needed to address some of the criticism that it faced on the Galaxy S5 and deliver a more premium feel," Ben Wood, chief of research at the telecoms consultancy CCS Insight, told the BBC.

"To actually make these devices in the kind of volumes that Samsung needs to deliver them across all its markets is a real challenge, so it's quite remarkable that it's been able to turn this product around so quickly.

"The challenge will be marketing it without cannibalising sales of the S5."

'Missed opportunity'

The new handset has a 4.7in (11.9cm) screen, making it slightly smaller than the Galaxy S5.

Its camera also has a lower specification of 12 megapixels, but it benefits from being nearly a fifth slimmer, measuring 6.7mm (0.26in) deep, and is also lighter, weighing in at 114g (4oz).

Samsung replaced the head of its mobile design team in May, when Lee Min-hyouk took over the role from Chang Dong-hoon.

The move followed several reviews that had praised the Galaxy S5's capabilities while criticising its feel.

Other manufacturers that had already shifted to offering part or full-metal bodied phones at the time included HTC, Huawei, Apple and Sony.

One expert, who tested the Galaxy Alpha before it was formally announced, has doubts about the new device.

"The back is still a plastic cover and it doesn't do enough to compete with the look and feel of the HTC One, for instance," said Francisco Jeronimo, a mobile devices analyst at the research firm IDC.

"This was an opportunity for Samsung, and it's missed it again.

"Unless the Alpha is made very affordable and put in a mid-tier price band, it may have difficulty as the materials don't feel as premium as some of its competitors."

A spokeswoman for Samsung said it would announce the device's price and shipping date at a later stage.

The company is expected to unveil the Galaxy Note 4, its latest large "phablet" handset, in Berlin on 3 September ahead of the start of the Ifa tech show.


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Reversible USB cable design finished

13 August 2014 Last updated at 17:44

The design for the new reversible USB interface - the standardised connection for data transfers between electronic devices - has been finished.

It means users will no longer have to worry which way round the part is facing when plugging it into a device.

The new USB Type-C is small enough for mobiles but "robust enough for laptops and tablets", its designers said.

But the new USB cables will not connect into the current ports that are found on millions of devices.

Specifications are now finalised but the rollout will take time as matching ports are included in new devices.

Pictures of renderings of the new USB were first posted online by tech websites such as Cnet.

The group developing the next generation of USB cable and connector consists of Hewlett-Packard, Intel, Microsoft, Renesas, STMicroelectronics and Texas Instruments. The agreed exact specifications have been passed back to the non-profit USB Implementers Forum.

'Long-lasting and robust'

"Interest in the USB Type-C connector has not only been global, but cross-industry as well," said Brad Saunders, the USB 3.0 Promoter Group's chairman.

"This specification is the culmination of an extensive, co-operative effort among industry leaders to standardise the next generation USB connector as a long-lasting, robust solution."

The new Type-C standard will be similar in size to the current MicroUSB connector, typically used for charging mobile phones and cameras. It will also allow data speed transfers of up to 10 gigabits per second, double what is possible at the moment

"In addition to the trend of smaller and more mobile devices driving reduced connector sizes, customers expect ease of use, excellent performance, and high reliability in connectivity solutions," said Tom Bonola, who works for HP and is part of the USB 3.0 Promoter Group.

The new reversible USB is similar to Apple's Lightning cable, which is reversible and has been standard in all of its iOS phones and tablets since 2012.

The first USB cables were released in the mid-1990s and, until now, could only be plugged in one way to ensure a data connection.


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Jackson video premiered on Twitter

14 August 2014 Last updated at 12:09

Epic Records has premiered a video for a new Michael Jackson single on Twitter - a coup for the social network, which is more commonly used to provide links to others' material.

To promote the event, Twitter created a map showing the late singer's top-tweeted songs in different countries.

The release comes in the same week that the firm declared its goal was to bring "more video into our users' timelines".

It added that it sought to make money by charging for "promoted" slots.

"We now offer advertisers the ability to run ads with a new cost per view (CPV) ad buying model," David Regan, senior product manager, TV and Video wrote on its advertising news page.

"This means advertisers only get charged when a user starts playing the video.

"Additionally, advertisers using Promoted Video have access to robust video analytics, including completion percentage and a breakout of organic versus paid video views."

Twitter began experimenting with video in 2012 when it allowed users to embed YouTube links into tweets.

At the start of 2013, it launched the Vine app, which allowed the creation of six second videos designed to play on a loop in newsfeeds.

A few months later it rolled out its Amplify program, which allows advertisers to pay for short pre-roll sponsorship clips that run before videos posted by a select number of organisations, including Warner Music, the Vevo music service, Conde Nast, the BBC and the US National Basketball Association.

Video ads have already proved to be a big revenue generator for Twitter's rival Facebook.

But unlike Mark Zuckerberg's company, Twitter's ads will not auto-play when they appear, at least at this stage.

"Both Twitter and Facebook are both integrating video much more deeply into the overall user experience, and people's tolerance and expectation of seeing video is also going up," commented Mark Mulligan, editor of the Music Industry Blog.

"While undoubtedly, given the choice, people would not have their Facebook experience full of ads, it's done nothing to dent the social network's continued growth and usage.

"With Twitter there's a lower amount of consumer attention time to play around with - it will not be able to put 30-second pre-roll ads, like you see on YouTube. It will have to come out with a set of formats that are unique to its audience."

The song, A Place with no Name, comes from a recently released posthumous album that features previously unreleased tracks recorded by Michael Jackson between 1983 and 1999.

The album topped the UK chart in May.


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Berlin bans Uber on 'safety grounds'

14 August 2014 Last updated at 12:23

The mobile taxi app Uber has been banned in Berlin by the city's State Department of Civil and Regulatory Affairs.

In a statement, the authority said it had banned the app on passenger safety grounds and threatened the firm with a 25,000 euro (£20,000) fine for ignoring the order.

Uber said it would challenge the ban.

It is the latest setback for Uber, which has faced bans and protests in cities across Europe.

The Berlin authority said passengers may not be covered by insurance because they aren't traditional cabs.

Uber set up in Berlin in February last year.

Fabien Nestmann, general manager at Uber in Germany, said the company would challenge the ban.

"The decision from the Berlin authorities is not progressive and it's seeking to limit consumer choice for all the wrong reasons," he said. "As a new entrant we're bringing much-needed competition to a market that hasn't changed in years."

'Competing unfairly'

In June, a protest by thousands of drivers of black cabs in London brought part of the city to a halt. London cabbies say Uber drivers don't have to follow the same strict rules.

Uber lets smartphone users hail cabs through its software. The company takes a cut of the fare.

Earlier this month, senior Labour MP Margaret Hodge said the app was "competing unfairly" with London's black cabs.

She has written to Boris Johnson asking why Transport for London allows cars to take bookings through the app without a licence to operate in the capital.

Mrs Hodge claims the firm is "opting out of the UK tax regime" but Uber said it complied with "all applicable tax laws".


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Data jams as net hardware bug bites

14 August 2014 Last updated at 13:05 By Mark Ward Technology correspondent, BBC News

Browsing speeds could slow over the next week as old hardware is upgraded to handle the net's growth, says networking giant Cisco.

Some older kit has hit an upper memory limit in the number of routes it can use to despatch data around the world.

In the last few days the number of possible routes breached that upper limit which might mean those routers start to struggle.

Already some firms are reporting users are having problems.

Global issue

The problem has emerged as the number of connections between the different networks that make up the internet has continued to grow, wrote Omar Santos from Cisco in a blogpost.

Routers, which send data around the net, keep track of all the ways data can travel via an internal log known as a routing table. This list is constantly updated according according to the ebbs and flow of internet traffic.

This week the number of entries on that global routing table went past more than 524,000. That represents a growing problem, said Mr Santos, because five separate devices Cisco makes can only handle a routing table of 524,288 entries.

As more and more routers around the world have to support 512K entries and beyond, the potential problems will grow, said Jim Cowie from internet monitoring firm Renesys.

"512K is right around the corner for everyone on Earth, as early as next week," he wrote in a blog post, adding, "this situation is more of an annoyance than a real internet-wide threat."

Routers that hit the memory limit could slow down, lose data or crash.

So far, said Mr Cowie, there was little evidence that the 512K problem was bringing about any more disruption than Renesys normally sees.

However, hosting firm LiquidWeb blamed the 512K bug for service disruption that hit it on Tuesday and it is also thought to be instrumental in causing problems for eBay, Comcast and Time-Warner.

Paul Lettington, network architect at UK ISP Andrews and Arnold, said workarounds did exist for the bug that should help older kit cope. Cisco has also published advice for owners of vulnerable hardware.

Andrews and Arnold had only seen indirect evidence of the 512K bug starting to bite, said Mr Lettington.

"We have seen anomalies with other networks on the internet which could have been caused by it, and these may have had an effect on our customers accessing those other networks," he said.

He added; "It is unlikely that any network operators will step forward and say that they were affected by it, as it would require admitting that they are running older, less capable hardware and are not on top of managing the maintenance of it."

Roland Dobbins, a senior analyst at Arbor Networks, said the too-many-routes problem had emerged twice before when the number of routes surpassed 128K and then 256K.

At both times unskilled and smaller organisations were caught out as hardware struggled to cope. A similar situation may recur this time, he said, because skilled engineers who know about the limitations of ageing network hardware were still rare.

"This may come as a surprise to non-specialists who view the internet as a high-tech affair comparable to the bridge of the USS Enterprise of Star Trek fame," he said. "In actuality, the internet is more akin to an 18th century Royal Navy frigate, with a lot of running about, climbing, shouting, and tugging on ropes required to maintain the desired course and speed."


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Sweat-powered 'phone battery' made

14 August 2014 Last updated at 14:00 By James Morgan Science reporter, BBC News, San Francisco

A sweaty gym workout is not only good for your health - it could also energise your phone.

A tattoo that produces power from perspiration has been unveiled at the American Chemical Society meeting.

The biobattery is fuelled by lactate - which is naturally present in sweat after vigorous exercise.

It could soon power heart monitors, digital watches and eventually even smartphones, say scientists in California.

The dream of "people power"- using the body to charge portable electronic gadgets - has inspired many innovative approaches.

Some harness movement - via piezoelectrics - while others use blood to power implanted biofuel cells.

"Our device is the first to use sweat. It's a proof of concept," said Dr Wenzhao Jia of at the University of California, San Diego, who gave details of her method in the journal Angewandte Chemie.

"At the moment the power is not that high - only four microwatts. But we are working on enhancing it so it can power small electronic devices."

Interestingly, her team did not set out to build a biobattery. Their aim was to make a wearable monitor for lactate.

Athletes in training measure their lactate levels to evaluate their work-rate and fitness.

But monitoring it can be inconvenient as it typically relies on taking blood samples.

To develop a faster, more comfortable test, Dr Jia printed a lactate sensor onto temporary tattoo paper.

"I've worn it myself - you don't even feel it. It really is like a tattoo," she told BBC News.

"It's not just for athletes. Most people who exercise want to know how they can improve their workout.

"We can measure our heart rate - but if you combine that physical feedback with chemical data you get a much more comprehensive view of your exercise status."

Her team then went a step further, turning the sensor into a sweat-powered biobattery.

They incorporated an enzyme that strips electrons from lactate, generating a weak electrical current.

When volunteers on an exercise bike wore the tattoo, they were able to generate up to 70 microwatts per sq cm of skin.

Interestingly, people who were less fit produced the most power. While those who exercise most (more than three times per week) produced the least.

"We think that's because less fit people become fatigued sooner, so they form more lactate," Dr Jia explained.

"A fit person is going to have to work out much harder to power the battery."

Her lab has partnered with a start-up company to develop the product.

Next steps include linking the tattoo to portable gadgets, and adding a way to store the generated current - by integrating a device such as capacitor.

But the main challenge is to ramp up the power. More than double the current value would be needed for a digital watch - 10 microwatts.

"It's a challenge because our electrodes are only very small - just 2x3mm," said Dr Jia.

One route is to make the device more sensitive to lactate.

Another is to incorporate several biofuel cells - connected in serial or parallel.

But why use the body at all? Why not simply miniaturise conventional batteries and make them wearable?

"Because biobatteries offer certain other advantages," explained Dr Jia.

"They recharge more quickly. They are safer as there is no risk they will explode or leak toxic chemicals.

"And they use a renewable energy source. You."

Follow James on Twitter.


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