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Keeping fruit, vegetables and cut flowers fresh longer

2013-05-15
New technology offers the promise of reducing billions of dollars of losses that occur each year from the silent, invisible killer of fruits, vegetables and cut flowers — a gas whose effects are familiar to everyone who has seen bananas and other fruit ripen too quickly and rot. That's the conclusion of an article in the ACS journal Chemical Reviews. Nicolas Keller, Marie-Noëlle Ducamp, Didier Robert and Valérie Keller explain that fruits, vegetables and flowers are still alive after harvest. They produce and release into the air ethylene gas, which fosters ripening ...

Making frequency-hopping radios practical

2013-05-15
CAMBRIDGE, MA -- The way in which radio spectrum is currently allocated to different wireless technologies can lead to gross inefficiencies. In some regions, for instance, the frequencies used by cellphones can be desperately congested, while large swaths of the broadcast-television spectrum stand idle. One solution to that problem is the 15-year-old idea of "cognitive radio," in which wireless devices would scan their environments for vacant frequencies and use these for transmissions. Different proposals for cognitive radio place different emphases on hardware and software, ...

Safer, more environmentally friendly flame retardant with first-of-its-kind dual effects

2013-05-15
Amid concerns over the potential health effects of existing flame retardants for home furniture, fabrics and other material, scientists are reporting development of an "exceptionally" effective new retardant that appears safer and more environmentally friendly. Their report on the first-of-its-kind coating, ideal for the polyurethane foam in couches and bedding that causes many fire deaths, appears in ACS Macro Letters. Jaime Grunlan and colleagues explain that upholstery furniture and mattresses are the items that ignite in about 17,000 fires each year, causing more ...

Maps developed to help forest industry outwit climate change

2013-05-15
University of Alberta researchers have developed guidelines being used by foresters and the timber industry to get a jump on climate change when planting trees. Maps developed by Laura Gray, a post-doctoral fellow in the Department of Renewable Resources, provide projections of climatically suitable habitat for tree species based on climate predictions for the 2020s, 2050s and 2080s. The work, published recently in the journal Climatic Change, is the first of its kind to tackle multiple potential climate scenarios for a large number of tree species across Western North ...

Terracotta and cement roofs vulnerable in wildfires, NIST study finds

2013-05-15
VIDEO: The NIST Dragon firebrand generator in action. Click here for more information. Although made of fire-resistant materials, terracotta and cement roof tiles are vulnerable to penetration by windblown embers generated in wildfires, according to new research findings* from the National Institute of Standards and Technology (NIST). In scoping experiments conducted in the Fire Research Wind Tunnel Facility at Japan's Building Research Institute, NIST fire scientist Samuel Manzello ...

Squishy hydrogels may be the ticket for studying biological effects of nanoparticles

2013-05-15
A class of water-loving, jelly-like materials with uses ranges ranging from the mundane, such as superabsorbent diaper liners, to the sophisticated, such as soft contact lenses, could be tapped for a new line of serious work: testing the biological effects of nanoparticles now being eyed for a large variety of uses. New research* by scientists at the National Institute of Standards and Technology (NIST) demonstrates that three-dimensional scaffolds made with cells and supporting materials known as hydrogels can serve as life-like measurement platforms for evaluating how ...

NIST demonstrates significant improvement in the performance of solar-powered hydrogen generation

2013-05-15
Using a powerful combination of microanalytic techniques that simultaneously image photoelectric current and chemical reaction rates across a surface on a micrometer scale, researchers at the National Institute of Standards and Technology (NIST) have shed new light on what may become a cost-effective way to generate hydrogen gas directly from water and sunlight.* Their quarry is a potentially efficient, cost-effective, photoelectrochemical (PEC) cell—essentially a solar cell that produces hydrogen gas instead of electric current. "A major challenge with solar energy is ...

NASA sees activity continue on the sun

2013-05-15
Solar activity continued on May 14, 2013, as the sun emitted a fourth X-class flare from its upper left limb, peaking at 9:48 p.m. EDT. This flare is classified as an X1.2 flare and it is the 18th X-class flare of the current solar cycle. The flare caused a radio blackout – categorized as an R3, or strong, on NOAA's space weather scales from R1 to R5 -- which has since subsided. The flare was also associated with a non-Earth-directed CME. CMEs and flares are separate but related solar phenomena: solar flares are powerful bursts that send light and radiation into space; ...

Despite new recommendations, women in 40s continue to get routine mammograms at same rate

2013-05-15
Women in their 40s continue to undergo routine breast cancer screenings despite national guidelines recommending otherwise, according to new Johns Hopkins research. In 2009, the U.S. Preventive Services Task Force (USPSTF) sifted through the evidence and recommended that while women ages 50-74 should continue to undergo mammograms every two years, those between the ages of 40 and 49 without a family history of breast cancer should discuss the risks and benefits of routine screening mammography with their physicians to make individual decisions. As a result of the altered ...

Scientists develop 'green' pretreatment of Miscanthus for biofuels

2013-05-15
URBANA –Two University of Illinois scientists have developed an environmentally friendly and more economical way of pretreating Miscanthus in the biofuel production process. "We pretreat the biomass with switchable butadiene sulfone in the presence of water to break down the plant cell wall, which consists of cellulose, hemicellulose, and lignin, the source of biofuels and value-added products," said Hao Feng, a U of I professor of food science and human nutrition who also has extensive research experience with biofuels. The new technique is a green alternative to current ...

Pelvic organ prolapse surgery less effective than expected

2013-05-15
SALT LAKE CITY – Research conducted by the Pelvic Floor Disorders Network, an initiative funded by the National Institutes of Health, has revealed that the long-term success rates of a surgery to treat pelvic organ prolapse are lower than expected. Nearly one-third of women develop anatomic or symptomatic treatment failure within five years of undergoing sacrocolpopexy for pelvic organ prolapse, according to a study published in the May 15 issue of JAMA. "Each year, 225,000 women in the United States undergo surgery for pelvic organ prolapse, but little is known about ...

Robotic transplant an option for obese kidney patients

2013-05-15
Obese patients who received robotic kidney transplants had fewer wound complications than patients who received traditional "open" transplant surgery, according to surgeons at the University of Illinois Hospital & Health Sciences System. The findings should allow more obese patients to receive kidney transplants. Patients with a body mass index (BMI) greater than 35 who have end-stage kidney disease are often denied transplantation, and patients with a BMI over 40 often die on dialysis without an opportunity for transplant. Obesity "markedly increases the risk of wound ...

Community Catalyst responds to ADA oral health campaign

2013-05-15
BOSTON – "Lack of access to dental care in the United States has reached epic proportions. Dental disease is the number one chronic illness affecting children – more common than asthma. The Institute of Medicine clearly states that the current dental delivery system doesn't work for a third of the people in the U.S. "The American Dental Association survey and report confirm the extent of the problem, but the association's recommendations for combating the problem are sorely lacking in one area: the refusal to include midlevel dental providers in the fight to expand access ...

Fall warming on Antarctic Peninsula driven by tropically forced circulation

2013-05-15
The eastern side of the Antarctic Peninsula, a finger of the southern polar continent that juts toward South America, has experienced summer warming of perhaps a half-degree per decade – a greater rate than possibly anywhere else on Earth – in the last 50 years, and that warming is largely attributed to human causes. But new University of Washington research shows that the Southern Hemisphere's fall months – March, April and May – are the only time when there has been extensive warming over the entire peninsula, and that is largely governed by atmospheric circulation ...

Community groups & neonatal mortality in Vietnam

2013-05-15
Community groups in rural Vietnam comprised of local health workers, politicians and laywomen (Maternal and Newborn Health Groups) set up to tackle challenges to maternal and neonatal health may reduce the neonatal death rate after three years and increase antenatal care attendance, according to a study by researchers from Sweden and Vietnam published in this week's PLOS Medicine. These findings are important as they show that is it feasible to implement community-based activity into the public sector system at low cost. The researchers, led by Lars-Åke Persson from ...

Asymptomatic carriage of M. pneumoniae common in children

2013-05-15
The bacterium M. pneumoniae is carried at high rates in the upper respiratory tracts of healthy children and usual diagnostic tests cannot differentiate between such asymptomatic carriage and actual respiratory tract infection, according to a study by Dutch researchers published in this week's PLOS Medicine. These findings are important as they suggest that clinicians may need to reconsider the clinical significance of a positive test result for the presence of this bacterium. The researchers, led by Annemarie van Rossum from Erasmus MC–Sophia in Rotterdam, The Netherlands, ...

Implementation research & child diarrhea

2013-05-15
While considerable recent progress has been made against childhood diarrheal diseases, the number of children dying from diarrhoea remains unacceptably high. This week, PLOS Medicine publishes a report based upon the work of over 150 international experts who convened to review and discuss research priorities to address this global problem. Zulfiqar Bhutta from the Aga Khan University in Pakistan and colleagues report that the most important priority is for more research on implementation of known interventions. Research questions involving improving implementation, especially ...

Mental health & NCDs

2013-05-15
Non-communicable diseases (NCD) and mental disorders each constitute a huge portion of the worldwide health care burden, and often occur together, so they should be addressed together. These are the conclusions of the third article in a series published in PLOS Medicine that provides a global perspective on integrating mental health. Victoria Ngo from the RAND Corporation in California and international colleagues say that collaborative care models, where NCD care and mental health care are integrated and provided in the primary care setting, are effective for patients, ...

Surgery for common woman's condition may not be effective over long-term

2013-05-15
MAYWOOD – The initial success rates of the most durable surgery for a common condition in women declines over the long-term, according to data published today in the Journal of the American Medical Association. The procedure, abdominal sacrocolpopexy, is used to manage pelvic organ prolapse, a widespread but little-known condition that occurs when the vaginal wall protrudes outside of the vaginal opening. More than 225,000 surgeries are performed annually in the United States for pelvic organ prolapse. The cost for these procedures is more than $1 billion per year, ...

Dual chamber ICDs show higher risk of complications

2013-05-15
Even though patients receiving an implantable cardioverter-defibrillator (ICD) for primary prevention often receive a dual-chamber ICD, an analysis that included more than 32,000 patients receiving an ICD without indications for pacing finds that the use of a dual-chamber device compared with a single-chamber device was associated with a higher risk of device-related complications and similar 1-year mortality and hospitalization outcomes, according to a study in the May 15 issue of JAMA. "The central decision regarding ICD therapy is whether to use a single- or dual-chamber ...

Study evaluates long-term effectiveness of surgery for pelvic organ prolapse

2013-05-15
Results after seven years of follow-up suggest that women considering abdominal sacrocolpopexy (surgery for pelvic organ prolapse [POP]) should be counseled that this procedure effectively provides relief from POP symptoms; however, the anatomic support deteriorates over time; and that adding an anti-incontinence procedure decreases, but does not eliminate the risk of stress urinary incontinence, and mesh erosion can be a problem, according to a study in the May 15 issue of JAMA. "Pelvic organ prolapse occurs when the uterus or vaginal walls bulge into or beyond the ...

No significant change seen in overall smokeless tobacco use among US youths

2013-05-15
Tobacco use remains the leading preventable cause of death and disease in the United States. Declines in smoking among youths were observed from the late 1990s. "However, limited information exists on trends in smokeless tobacco use among U.S. youths," writes Israel T. Agaku, D.M.D., M.P.H., of the Harvard School of Public Health, Boston, and colleagues. As reported in a Research Letter in the May 15 issue of JAMA, the authors analyzed recent trends in prevalence of smokeless tobacco use among youths using the 2000-2011 National Youth Tobacco Survey, a biennial national ...

Wireless signals could transform brain trauma diagnostics

2013-05-15
Berkeley — New technology developed at the University of California, Berkeley, is using wireless signals to provide real-time, non-invasive diagnoses of brain swelling or bleeding. The device analyzes data from low energy, electromagnetic waves, similar to the kind used to transmit radio and mobile signals. The technology, described in the May 14 issue of the journal PLOS ONE, could potentially become a cost-effective tool for medical diagnostics and to triage injuries in areas where access to medical care, especially medical imaging, is limited. The researchers tested ...

Getting a grip on sleep

2013-05-15
All mammals sleep, as do birds and some insects. However, how this basic function is regulated by the brain remains unclear. According to a new study by researchers from the RIKEN Brain Science Institute, a brain region called the lateral habenula plays a central role in the regulation of REM sleep. In an article published today in the Journal of Neuroscience, the team shows that the lateral habenula maintains and regulates REM sleep in rats through regulation of the serotonin system. This study is the first to show a role of the lateral habenula in linking serotonin metabolism ...

Slim women have a greater risk of developing endometriosis than obese women

2013-05-15
Women with a lean body shape have a greater risk of developing endometriosis than women who are morbidly obese, according to the largest prospective study to investigate the link. The study, which is published online today (Wednesday) in Europe's leading reproductive medicine journal Human Reproduction [1], found that the risk of endometriosis was 39% lower in morbidly obese women – those with a body mass index (BMI) greater than 40 kg/m2 – compared with women with a current BMI in the low normal range (18.5-22.4 kg/m2). When the researchers looked back at the women's ...
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