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Chris Fisher

U.S. Government Glossed Over Cancer Concerns As It Rolled Out Airport X-Ray Scanners - ... - 1 views

  • Research suggests that anywhere from six to 100 U.S. airline passengers each year could get cancer from the machines.
  • Because of a regulatory Catch-22, the airport X-ray scanners have escaped the oversight required for X-ray machines used in doctors’ offices and hospitals. The reason is that the scanners do not have a medical purpose, so the FDA cannot subject them to the rigorous evaluation it applies to medical devices.
  • FDA has limited authority to oversee some non-medical products and can set mandatory safety regulations. But the agency let the scanners fall under voluntary standards set by a nonprofit group heavily influenced by industry.
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  • As for the TSA, it skipped a public comment period required before deploying the scanners. Then, in defending them, it relied on a small body of unpublished research to insist the machines were safe, and ignored contrary opinions from U.S. and European authorities that recommended precautions, especially for pregnant women.
  • Both the FDA and TSA say due diligence has been done to assure the scanners’ safety.
  • ProVision, made by defense contractor L-3 Communications, a passenger enters a chamber that looks like a round phone booth and is scanned with millimeter waves, a form of low-energy radio waves, which have not been shown to strip electrons from atoms or cause cancer.
  • In July, the European Parliament passed a resolution that security “scanners using ionizing radiation should be prohibited” because of health risks.
  • Some scientists argue the danger is exaggerated. They claim low levels stimulate the repair mechanism in cells, meaning that a little radiation might actually be good for the body.
  • But in the authoritative report on low doses of ionizing radiation, published in 2006, the National Academy of Sciences reviewed the research and concluded that the preponderance of research supported the linear link. It found “no compelling evidence” that there is any level of radiation at which the risk of cancer is zero.
  • Rebecca Smith-Bindman, a radiologist at the University of California, San Francisco, estimated that the backscatters would lead to only six cancers over the course of a lifetime among the approximately 100 million people who fly every year. David Brenner, director of Columbia University’s Center for Radiological Research, reached a higher number — potentially 100 additional cancers every year.
  • The government used to have 500 people examining the safety of electronic products emitting radiation. It now has about 20 people.
  • But in 1982, the FDA merged the radiological health bureau into its medical-device unit. “I was concerned that if they were to combine the two centers into one, it would probably mean the ending of the radiation program because the demands for medical-device regulation were becoming increasingly great,” said Villforth, who was put in charge of the new Center for Devices and Radiological Health. “As I sort of guessed, the radiation program took a big hit.”
  • the same 100 million people would develop 40 million cancers over the course of their lifetimes. In this sea of cancer cases, it would be impossible to identify the patients whose cancer is linked to the backscatter machines.
  • the FDA has not set a mandatory safety standard for an electronic product since 1985.
  • As a result, there is an FDA safety regulation for X-rays scanning baggage — but none for X-rays scanning people at airports.
  • The U.S. Customs Service deployed backscatter machines for several years but in limited fashion and with strict supervision. Travelers suspected of carrying contraband had to sign a consent form, and Customs policy prohibited the scanning of pregnant women.
  • In July, a federal appeals court ruled that the agency failed to follow rule-making procedures and solicit public comment before installing body scanners at airports across the country
  • Federal Aviation Administration’s medical institute has advised pregnant pilots and flight attendants that the machine, coupled with their time in the air, could put them over their occupational limit for radiation exposure
  • It was made up of 15 people, including six representatives of manufacturers of X-ray body scanners and five from U.S. Customs and the California prison system. There were few government regulators and no independent scientists.
  • The FDA delegated the task of establishing the voluntary standards to the American National Standards Institute.
  • “Establishing a mandatory standard takes an enormous amount of resources and could take a decade to publish,” said Dan Kassiday, a longtime radiation safety engineer at the FDA.
  • and before 9/11, many states also had the authority to randomly inspect machines in airports. But that ended when the TSA took over security checkpoints from the airlines.
  • Last year, in reaction to public anger from members of Congress, passengers and advocates, the TSA contracted with the Army Public Health Command to do independent radiation surveys. But email messages obtained in a lawsuit brought by the Electronic Privacy Information Center, a civil liberties group, raise questions about the independence of the Army surveys.
  • One email sent by TSA health and safety director Jill Segraves shows that local TSA officials were given advance notice and allowed to “pick and choose” which systems the Army could check.
  • The TSA considered the scanners again after two Chechen women blew up Russian airliners in
  • 2004.
  • Facing a continued outcry over privacy, the TSA instead moved forward with a machine known as a “puffer” because it released several bursts of air on the passengers’ clothes and analyzed the dislodged particles for explosives. But after discovering the machines were ineffective in the field and difficult to maintain, the TSA canceled the program in 2006.
  • Around that time, Rapiscan began to beef up its lobbying on Capitol Hill. It opened a Washington, D.C., office and, according to required disclosures, more than tripled its lobbying expenditures in two years, from less than $130,000 in 2006 to nearly $420,000 in 2008. It hired former legislative aides to Rep. David Price, D-N.C., then chairman of the homeland security appropriations subcommittee, and to Sen. Trent Lott, R-Miss.
  • It started a political action committee and began contributing heavily to Price; Rep. Bennie Thompson, D-Miss., then head of the homeland security committee; Rep. Jane Harman, D-Calif., also on that committee; and Sen. Thad Cochran, R-Miss., the top Republican on the Senate appropriations committee.
  • In addition, it opened a new North Carolina plant in Price’s district and expanded its operations in Ocean Springs, Miss., and at its headquarters in Torrance, Calif., in Harman’s district.
  • “Less than a month after U.S. Senator Trent Lott and other local leaders helped officially open Rapiscan Systems’ new Ocean Springs factory,” Lott’s office announced in a news release in late 2006, “the company has won a $9.1 million Department of Defense contract.”
  • in 2007, with new privacy filters in place, the TSA began a trial of millimeter-wave and backscatter machines at several major airports, after which the agency opted to go with the millimeter-wave machines. The agency said health concerns weren’t a factor.
  • But with the 2009 federal stimulus package, which provided $300 million for checkpoint security machines, the TSA began deploying backscatters as well. Rapiscan won a $173 million, multiyear contract for the backscatters, with an initial $25 million order for 150 systems to be made in Mississippi.        
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    I'm not really sure this is a SciByte story. But it was a good example of a story, with lots of great bits to capture.
Mars Base

Health check on the road - 0 views

  • A research team at the Technische Universitaet Muenchen (TUM), in collaboration with researchers at the BMW Group
  • develop a sensor system integrated into the steering wheel that can monitor the driver's state of health while driving
  • the device might be used recognize the onset fainting spells or heart attacks.
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  • monitors vital signs such as heart rate, skin conductance and oxygen saturation in the blood via simple sensors in the steering wheel
  • A driver's skin conductance, for instance, reveals whether he or she is under severe stress, or whether his or her blood pressure exceeds a critical value
  • "When a stress situation is detected by means of skin conductance values, phone calls can be blocked, for instance, or the volume of the radio turned down automatically.
  • With more serious problems the system could turn on the hazard warning lights, reduce the speed or even induce automated emergency braking."
  • Two commercially available sensors are key elements of the integrated vital signs measurement system
  • One of them shines infrared light into the fingers and measures the heart rate and oxygen saturation via reflected light
  • second measures the electric conductance of the skin at contact
Mars Base

Redefining dentistry through 'salivaomics' - 0 views

  • research findings show that saliva is made up of complex sets of molecules—including genes, proteins, DNA and RNA—that help paint a picture of an individual's biology
  • The study of the biological molecules in saliva is known as "salivaomics."
  • researchers have developed several informatics and statistical tools to help interpret biomarkers in saliva
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  • can then be used for early detection of disease, treatment monitoring, recurrence prediction and other translational assessments.
  • Research
  • has shown that saliva, as a medium for health screening is just as useful as blood and other bodily fluids
  • it has been shown that 20 percent more Americans visit their dentists more regularly than their physicians, there will be substantial opportunities for dentists to engage in primary health care by taking saliva samples from their patients and, based on the medical findings of those samples
Mars Base

Is Homeopathy Really As Implausible As It Sounds? | Popular Science - 0 views

  • The new British minister of health has recently become the target of scorn and mockery, after a science writer with The Telegraph noted that he supports homeopathy
  • there’s a difference between something that hasn’t been proven to work and something that couldn’t possibly work
  • Improvements in brain imaging technology, for example, have shown that meditation—a practice long dismissed by Western doctors as pure mysticism—can improve both the structure and function of the brain
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  • Let's ignore, for example, the homeopathic notion that illness is caused by a disturbance in an individual's "vital force" rather than something external, like a bacterium or virus
  • Another thing homeopathy has in common with Western medicine is its strict attention to how treatments are dosed
  • All homeopathic remedies are available in a huge range of concentrations
  • those concentrations are really small
  • homeopaths think of a large dose as a high dilution, instead of a high concentration.
  • idea that a lower dose of a drug has a bigger effect than a high dose runs contrary to what western medicine has found
Mars Base

NASA - Astronaut's Home Away from Home - 0 views

  • take care of the astronauts 24/7 in the Astronaut Crew Quarters during preflight training and leading up to all shuttle launches
  • they work in shifts, with additional staff called in as needed to help cook and clean.
  • The crew is extremely busy when they come in," Hooper said. "We could not function without all of the group's efforts to take care of the astronauts."
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  • Those who work in the crew quarters include cooks, attendants, flight data file personnel, flight nurses and other astronauts supporting the crew.
  • Inside an area that dates back to the Apollo Program are facilities that have been upgraded throughout the years, including a kitchen, staff conference room, crew conference room, workout room, lounge, laundry room, computer room, suit-up room, dining room, medical facility, staff office and prime crew sleeping quarters.
  • access to crew quarters is limited to the staff and astronaut support personnel leading up to each launch
  • certified food handlers
  • team's typical day begins at 6 a.m. They get the kitchen going for breakfast, lunch and dinner. Laundry and inventory are completed. Maintenance trouble calls are tended to, and sleeping quarters and the beach house are cleaned
  • The staff operates under NASA Johnson Space Center's Health Stabilization Program. Twice yearly, the staff undergoes a physical exam and trains regularly on health issues and crew quarters procedures
Mars Base

Wireless 'tooth tattoo' detects harmful bacteria - 0 views

  • Using silk strands pulled from cocoons and gold wires thinner than a spider's web, researchers at Princeton University have created a removable tattoo that adheres to dental enamel and could eventually monitor a patient's health with unprecedented sensitivity
Mars Base

Breakthrough therapy allows four paraplegic men to voluntarily move their legs - 0 views

  • Four young men who have been paralyzed for years achieved
  • moving their legs—as a result of epidural electrical stimulation of the spinal cord
  • All four participants were classified as suffering from chronic, motor complete spinal cord injuries and were unable to move their lower extremities prior to the implantation of an epidural stimulator
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  • The stimulator delivers a continuous electrical current to the participants' lower spinal cords, mimicking signals the brain normally transmits to initiate movement
  • an initial study, published in May 2011
  • evaluated the effects of epidural stimulation in the first participant
  • who recovered a number of motor functions as a result of the intervention
  • three years later, the key findings documented
  • detail the impact of epidural stimulation in a total four participants, including new tests
  • What is revolutionary
  • is that the second, third and fourth participants
  • were able to execute voluntary movements immediately following the implantation and activation of the stimulator.
  • The participants' results and recovery time were unexpected, which led researchers to speculate that some pathways may be intact post-injury and therefore able to facilitate voluntary movements.
  • Two of the four subjects were diagnosed as motor and sensory complete injured with no chance of recovery at al
  • Because of epidural stimulation, they can now voluntarily move their hips, ankles and toes
  • groundbreaking for the entire field and offers a new outlook that the spinal cord, even after a severe injury, has great potential for functional recovery.
  • In epidural stimulation, the electrical current is applied at varying frequencies and intensities to specific locations on the lumbosacral spinal cord
  • corresponding to the dense neural bundles that largely control the movement of the hips, knees, ankles and toes
  • With the participants, once the signal was triggered, the spinal cord reengaged its neural network to control and direct muscle movements.
  • When coupling the intervention with rehabilitative therapy, the impact of epidural stimulation intensified
  • Over the course of the study, the researchers noted that the participants were able to activate movements with less stimulation, demonstrating the ability of the spinal network to learn and improve nerve functions
  • uncovered a fundamentally new intervention strategy that can dramatically affect recovery of voluntary movement in individuals with complete paralysis, even years after injury
  • The belief that no recovery is possible and complete paralysis is permanent has been challenged
  • Beyond regaining voluntary movement, the research participants have displayed a myriad of improvements in their overall health
  • increases in muscle mass and regulation of their blood pressure, as well as reduced fatigue and dramatic improvements to their sense of well-being.
  • all four men were able to bear weight independently, as reported by the team
  • The study offers hope that clinical therapies can be developed to advance treatment for the nearly 6 million Americans living with paralysis, including nearly 1.3 million with spinal cord injuries.
  • The four paralyzed participants ranged in neurological level from C7–T5 and were at least two years post-injury at the time of the intervention
  • Two of them had been rated "A" on the American Spinal Injury Association's classification system, meaning they had absolutely no sensation or cognition below the site of their injury
  • surprising the scientists, who believed at least some of the sensory pathway must be intact for epidural stimulation to be successful.
  • With this study, the investigators show that their findings about a motor complete patient regaining movement, as published three years ago in The Lancet, were not an anomaly
  • At the present time,
  • there are no effective evidence-based treatments for chronic spinal cord injury
  • , the implications of this study for the entire field are quite profound, and we can now envision a day when epidural stimulation might be part of a cocktail of therapies used to treat paralysis
  • first learned that a patient had regained voluntary control as a result of the therapy, we were cautiously optimistic
  • The research was funded by the Reeve Foundation and the National Institutes of Health
  • the Leona M. and Harry B. Helmsley Charitable Trust, the Kessler Foundation, the University of Louisville, the Jewish Hospital and St. Mary's Foundation, the Frazier Rehab Institute and University Hospital.
  • Investing in epidural stimulation
  • Now that spinal stimulation has been successful in four out of four patients, there is evidence to suggest a large cohort of individuals,
  • previously with little realistic hope of any meaningful recovery from spinal cord injury, may benefit from this intervention
  • how we see motor complete spinal cord injury
  • don't have to necessarily rely on regrowth of nerves in order to regain function
  • observed this in four out of four people suggests that this is actually a common phenomenon in those diagnosed with complete paralysis
  • The scientists are optimistic that the therapy intervention will continue to result in improved motor functions
  • based on observations from the research, there is strong evidence that with continued advancements of the epidural stimulator, individuals with complete spinal cord injuries will be able to bear weight independently, maintain balance and work towards stepping
Mars Base

Mars Rover Opportunity Exploring Possibly Habitable Ancient Environment | Space.com - 0 views

  • Opportunity rover,
  • is currenlty studying clay deposits on the rim of the Red Planet's Endeavour Crater.
  • clays imply that the area was exposed to relatively neutral — as opposed to harshly acidic or basic — water long ago,
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  • clearly show us a chemistry that would've been suitable for life at the Opportunity site
  • Mars Reconnaissance Orbiter spacecraft spotted them from orbit, leading the rover team to point the golf-cart-size robot toward its current location, which is known as Matijevic Hill.
  • From orbit, we have seen the unambiguous infrared spectral signature of clays along the rim of Endeavour Crater
  • Opportunity has already circumnavigated Matijevic Hill
  • ikely stay at Matijevic Hill for a while, trying to understand how the clays were laid down billions of years ago
  • Opportunity is still going strong. It has some age-related issues, such as an arthritic arm, but the rover remains in good health
  • Part of the work will involve investigating mysterious tiny spherules Opportunity has discovered embedded in the clay matrix
  • initially thought the BB-size gray spheres were similar to the iron-rich "blueberries"
  • initial analyses have shown that's not the case, leading Squyres to dub them "newberries."
  • The team isn't sure exactly what the newberries are, or how they formed
Mars Base

Numbers Games Devised to Aid People with "Dyscalculia": Scientific American - 0 views

  • Three months on, Christopher seems to be faring better at the number-line game, going so quickly that Babtie asks him to slow down and explain his reasoning for each move
  • dyscalculic children tend to learn much more quickly when they talk through what they do
  • also believes that Christopher's maths anxiety, a near-universal trait of child and adult dyscalculics, is fading
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  • Tetris-like game called Numberbonds, in which bars of different lengths fall down the screen
  • select a block of the correct size to fill out a row
  • emphasizes spatial relationships, which some dyscalculics also struggle with.
  • The Number Sense games, including a snazzy-looking iPhone version of Numberbonds, are intended to nurture the abilities that
  • contends, are the root of numerical cognition and the core deficit of dyscalculia — manipulating precise quantities.
  • In a game called Dots to Track, for example, children must ascribe an Arabic numeral to a pattern of dots, similar to those on dice.
  • When they enter the wrong value — and they often do — the game asks the children to add or remove dots to achieve the correct answer.
  • Other students are improving more slowly, but it is not easy to say why
  • Dyslexia, attention deficit hyperactivity disorder and autism spectrum disorder are common among dyscalculics, and it can be difficult to untangle these problems,
  • with the right practice and attention from teachers and parents, dyscalculic children can thrive,
  • computer games are a supplement, not a replacement, for one-on-one tutoring.
  • in 2009 that Number Race, a game his group developed, modestly improved the ability of 15 dyscalculic kindergarten children to discern the larger of two numbers, but that it had no effect on their arithmetic or counting
  • a Swiss team reported in 2011 that a game that involves placing a spaceship on a number line helped eight- to ten-year-old dyscalculics with arithmetic
  • studied the children in an fMRI scanner during a task that involved arranging numbers.
  • one month after training, the children showed increased activation in the intraparietal sulcus and reduced neural activation elsewhere in the parietal lobes — a hint that their improvements in arithmetic were related to changes involving brain areas that respond to number.
  • hopes to monitor the brains of students such as Christopher as they practice Number Sense, to see if their parietal lobes are indeed changing
  • turned down by every funding source he has applied to
  • dyscalculia, like other learning disabilities, takes a toll on productivity
  • it doesn't attract much attention or money
  • In the United States, for example, the National Institutes of Health spent $2 million studying dyscalculia between 2000 and 2011, compared with more than $107 million on dyslexia.
Mars Base

Gut microbes may be behind weight loss after gastric bypass | Genes & Cells | Science News - 0 views

  • Roux-en-Y, the most common technique for gastric bypass, diverts food around most of the stomach and upper small intestine
  • Previous studies of people and rats have found that the natural mix of microbes in the intestines changes after gastric bypass, with some groups growing more prominent and others diminishing in number
  • No one knew whether the altered microbial composition was merely a side effect of the surgery, or whether shifting bacterial populations could help people lose weight.
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  • To find out
  • fattened up mice then performed either bypass or a sham surgery on the animals
  • Mice in the bypass group lost about 29 percent of their body weight within three weeks of the procedure
  • even before the mice dropped weight, those in the bypass group already had an altered mix of intestinal bacteria
  • Compared with the sham operation group, the bypass mice had more of certain types of microbes
  • Some species of
  • are pathogens, but others help prevent inflammation and maintain intestinal health
  • Bypass mice also had more
  • bacteria, which can feed on mucus lining the intestines, particularly when the host is cutting calories
  • researchers speculate that the microbes somehow trigger fat-burning changes in the host’s metabolism
  • Then the researchers transplanted bacteria from the intestines of bypass mice into mice that had been raised without any bacteria
  • The formerly germ-free mice slimmed down, trimming about 5 percent of their body weight, even though they started out lean
  • Germ-free mice that received bacteria from the guts of sham surgery mice actually packed on a bit of fat
Mars Base

Could scientists peek into your dreams? (w/ video) - 0 views

  • small new study suggests
  • Visual experiences you have when dreaming are detectable by the same type of brain activity that occurs when looking at actual images when you're awake
  • The scientists created decoding computer programs based on brain activity measured while wide-awake study participants looked at certain images
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  • right after being awakened from the early stages of sleep, the researchers asked the subjects to describe the dream they were having
  • used functional MRI to monitor brain activity of the participants and polysomnography to record the physical changes that occur during sleep
  • compared evidence of brain activity when participants were awake and looking at real images to the brain activity they saw when participants were dreaming
  • the study shows it may be possible to use brain activity patterns to understand something about what a person is dreaming about
  • current approach requires the data of image viewing and sleep within the same [person
  • methods being developed for aligning brain patterns across people
  • there are practical applications to the research
  • evidence suggesting that the pattern of spontaneous brain activity is relevant to health issues
  • researchers chose to awaken the subjects in light sleep rather than in deeper "rapid eye movement" (REM) sleep solely to make the research easier to do
  • it takes at least an hour to reach first REM stage, it would be difficult to get sleep and dream data from multiple participants
  • why it is so hard to remember a dream minutes after waking up
  • thinks it is because particular neurotransmitters or brain regions involved in memory are not active during sleep
  • During sleep and dreaming, part of the brain—the higher visual cortex—is working as if seeing images
  • one expert said the results are intriguing, he was cautious
  • previous disappointments relating brain activity to complex visual experience
  • like to see this replicated
Mars Base

Mars Science Laboratory: Data From NASA Rover's Voyage To Mars Aids Planning - 0 views

  • Curiosity's Radiation Assessment Detector (RAD) is the first instrument to measure the radiation environment during a Mars cruise mission from inside a spacecraft that is similar to potential human exploration spacecraft
  • The findings,
  • indicate radiation exposure for human explorers could exceed NASA's career limit for astronauts if current propulsion systems are used.
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  • Two forms of radiation pose potential health risks to astronauts in deep space. One is galactic cosmic rays (GCRs), particles caused by supernova explosions and other high-energy events outside the solar system. The other is solar energetic particles (SEPs) associated with solar flares and coronal mass ejections from the sun
  • NASA has established a three percent increased risk of fatal cancer as an acceptable career limit for its astronauts currently operating in low-Earth orbit
  • The RAD data showed
  • Only about three percent of the radiation dose was associated with solar particles because of a relatively quiet solar cycle and the shielding provided by the spacecraft
  • In terms of accumulated dose, it's like getting a whole-body CT scan once every five or six days
  • Current spacecraft shield much more effectively against SEPs than GCRs. To protect against the comparatively low energy of typical SEPs, astronauts might need to move into havens with extra shielding on a spacecraft or on the Martian surface, or employ other countermeasures
  • GCRs tend to be highly energetic, highly penetrating particles that are not stopped by the modest shielding provided by a typical spacecraft.
  • RAD data collected during Curiosity's science mission will continue to inform plans to protect astronauts as NASA designs future missions to Mars in the coming decades.
Mars Base

'Walking robot' allows paralyzed man to move again | Fox News - 0 views

  • Developed by the military to allow soldiers to carry heavy weights long distances, then adapted to use with paralyzed patients, this real life "Iron Man" uses two lithium batteries, motors, computer chips and a hand-operated console.
  • available at 30 hospitals around the country so far
  • Researchers at Vanderbilt University have developed the lightest model, under 30 pounds, and expect the uses and benefits of the exoskeleton to extend to patients with stroke and many other neurological conditions.
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  • I began to sleep better at night
  • spasms are decreased
  • better bladder control
  • the exoskeleton is good for the skin, muscles, bones, circulation, and it decreases the risk of blood clots and wounds
  • In the absence of a cure
  • using technological devices to help them to gain mobility and to be able to better care for themselves
  • this electrically powered robot where they actually can go distances without exhausting themselves
  • one downside, and that's the cost, which is up to $140,000 for a single unit
  • as more and more patients use it and the technology is simplified, the cost is expected to come down.
Mars Base

Olympians live longer than general population... But cyclists no survival advantage ove... - 0 views

  • second study comparing athletes who trained at different physical intensities, found that those from high or moderate intensity sports have no added survival benefit over athletes from low intensity sports
  • Olympic medallists live longer than the general population, regardless of country of origin, medal won, or type of sport played
  • those who engage in disciplines with high levels of physical contact, such as boxing, rugby and ice hockey, are at an increased risk of death in later life
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  • researchers compared life expectancy among 15,174 Olympic athletes who won medals between 1896 and 2010 with general population groups matched by country, sex, and age
  • All medallists lived an average of 2.8 years longer
  • in eight out of the nine country groups studied.
  • Gold, silver and bronze medallists enjoyed roughly the same survival advantage, as did medallists in both endurance and mixed sports
  • Medallists in power sports had a smaller, but still significant, advantage over the general population.
  • study was not designed to determine why Olympic athletes live longer
  • possible explanations include genetic factors, physical activity, healthy lifestyle, and the wealth and status that come from international sporting glory
  • In the second study, researchers measured the effect of high intensity exercise on mortality later in life among former Olympic athletes
  • They tracked 9,889 athletes
  • who took part in at least one Olympic Games between 1896 and 1936
  • represented 43 disciplines requiring different levels of exercise intensity and physical contact
  • researchers did find an 11% increased risk of mortality among athletes from disciplines with a high risk of body collision and with high levels of physical contact, such as boxing, rugby and ice hockey, compared with other athletes
  • two public health experts point out that people who do at least 150 minutes a week of moderate to vigorous intensity physical activity also have a survival advantage compared with the inactive general population
  • , they found that athletes from sports with high cardiovascular intensity (such as cycling and rowing) or moderate cardiovascular intensity (such as gymnastics and tennis) had similar mortality rates compared with athletes from low cardiovascular intensity sports, such as golf or cricket
Mars Base

Mars Colonists Wanted to Explore Red Planet | Space.com - 0 views

  • The Netherlands-based nonprofit Mars One, which hopes to put the first boots on the Red Planet in 2023, released its basic astronaut requirements
  • (Jan. 8),
  • televised global selection process that will begin later this year.
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  • anyone who is at least 18 years old can apply to become a Mars colony pioneer
  • important criteria, officials say, are intelligence, good mental and physical health and dedication to the project, as astronauts will undergo eight years of training before launch.
  • Mars One plans to launch a series of robotic cargo missions between 2016 and 2021, which will build a habitable Red Planet outpost ahead of the arrival of the first four colonists in 2023.
  • More settlers will arrive every two years after that. There are no plans to return the pioneers to Earth
  • fund most of its ambitious activities by staging a global reality-TV event
  • Well before the official Astronaut Selection Program, we received more than 1,000 emails from individuals who desire to go to Mars
Mars Base

Rocket powered by nuclear fusion could send humans to Mars - 0 views

  • researchers and scientists
  • are building components of a fusion-powered rocket aimed to clear many of the hurdles that block deep space travel, including long times in transit, exorbitant costs and health risks
  • funded through NASA's Innovative Advanced Concepts Program
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  • Last month
  • presented their mission analysis for a trip to Mars, along with detailed computer modeling and initial experimental results
  • one of a handful of projects awarded a second round of funding last fall after already receiving phase-one money in a field of 15 projects chosen from more than 700 proposals
  • NASA estimates a round-trip human expedition to Mars would take more than four years using current technology
  • team have published papers calculating the potential for 30- and 90-day expeditions to Mars using a rocket powered by fusion, which would make the trip more practical and less costly
  • They have demonstrated successful lab tests of all portions of the process
  • Now, the key will be combining each isolated test into a final experiment that produces fusion using this technology
  • The research team has developed a type of plasma that is encased in its own magnetic field
  • Nuclear fusion occurs when this plasma is compressed to high pressure with a magnetic field.
  • The team has successfully tested this technique in the lab.
  • a small grain of sand of this material has the same energy content as 1 gallon of rocket fuel.
  • power a rocket, the team has devised a system in which a powerful magnetic field causes large metal rings to implode around this plasma, compressing it to a fusion state
  • The converging rings merge to form a shell that ignites the fusion, but only for a few microseconds
  • enough energy is released from the fusion reactions to quickly heat and ionize the shell
  • This super-heated, ionized metal is ejected out of the rocket nozzle at a high velocity. This process is repeated every minute or so, propelling the spacecraft
  • successfully demonstrated the metal-crushing process
  • The team had a sample of the collapsed, fist-sized aluminum ring resulting from one of those tests on hand for people to see and touch at the recent NASA symposium
  • Now, the team is working to bring it all together by using the technology to compress the plasma and create nuclear fusion
  • With the flip of a switch, the capacitors are simultaneously triggered to deliver 1 million amps of electricity for a fraction of a second to the magnet, which quickly compresses the metal ring.
  • The mechanical process and equipment used are reasonably straightforward
  • In actual space travel, scientists would use lithium metal as the crushing rings to power the rocket. Lithium is very reactive, and for lab-testing purposes, aluminum works just as well
  • Nuclear fusion may draw concern because of its application in nuclear bombs, but its use in this scenario is very different
  • The fusion energy for powering a rocket would be reduced by a factor of 1 billion from a hydrogen bomb, too little to create a significant explosion
  • Also,
  • concept uses a strong magnetic field to contain the fusion fuel and guide it safely away from the spacecraft and any passengers within
Mars Base

Potential diabetes breakthrough: Researchers discover new hormone spurring beta cell pr... - 0 views

  • have discovered a hormone that holds promise for a dramatically more effective treatment of type 2 diabetes
  • researchers believe that the hormone might also have a role in treating type 1, or juvenile, diabetes
  • The hormone, called betatrophin, causes mice to produce insulin-secreting pancreatic beta cells at up to 30 times the normal rate
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  • The new beta cells only produce insulin when called for by the body, offering the potential for the natural regulation of insulin
  • The researchers who discovered betatrophin
  • caution that much work remains to be done before it could be used as a treatment in humans
  • the results of their work, which was supported in large part by a federal research grant, already have attracted the attention of drug manufacturers.
  • could eventually mean that instead of taking insulin injections three times a day, you might take an injection of this hormone once a week or once a month, or in the best case maybe even once a year
  • Type 2 diabetes,
  • usually caused by a combination of excess weight and lack of exercise
  • causes patients to slowly lose beta cells and the ability to produce adequate insulin
  • provide this hormone, the type 2 diabetic will make more of their own insulin-producing cells, and this will slow down, if not stop, the progression of their diabetes
  • betatrophin primarily as a treatment for type 2 diabetes, he believes it might play a role in the treatment of type 1 diabetes as well
  • perhaps boosting the number of beta cells and slowing the progression of that autoimmune disease when it's first diagnosed
  • betatrophin could be in human clinical trials within three to five years, an extremely short time in the normal course of drug discovery and development
  • not for the federal funding of basic science research, there would be no betatrophin
  • impressed National Institutes of Health grant reviewers, and received federal funding for 80 percent of the work leading to the discovery of betatrophin
  • just wondering what happens when an animal doesn't have enough insulin. We were lucky to find this new gene that had largely gone unnoticed before
  • Another hint came from studying
  • What happens during pregnancy
  • During pregnancy, there are more beta cells needed, and it turns out that this hormone goes up during pregnancy
  • in pregnant mice
  • when the animal becomes pregnant this hormone is turned on to make more beta cells
  • not interested in curing mice of diabetes, and we now know the gene is a human gene
  • know that the hormone exists in human plasma; betatrophin definitely exists in humans
Mars Base

Twinkle, twinkle little star: New app measures sky brightness - 0 views

  • Researchers from the German "Loss of the Night" project have developed an app for Android smart phones, which counts the number of visible stars in the sky
  • The data from the app will be used by scientists to understand light pollution on a world wide scale.
  • The smartphone app will evaluate sky brightness, also known as skyglow, on a worldwide scale
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  • This data can be used to map the distribution and changes in sky brightness, and will eventually allow scientists to investigate correlations with health, biodiversity, energy waste and other factors
  • The app works by interactively asking users to say whether individual stars are visible. By determining what the faintest visible star is, the researchers learn how many stars are visible at that location, and by extension how bright the sky is
  • With this app, people from around the world can collect data on skyglow without needing expensive equipment
  • some of the testers found that without intending too they learned the names of several stars and constellations
  • is based on the widely used Google Sky Map application
  • development of the app was sponsored by the German Federal Ministry of Research and Education,
  • satellites that observe Earth at night measure the light that is radiating into the sky, not the brightness that is experienced by people and other organisms on the ground
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