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Science News for April 15, 2013


JCI early table of contents for April 15, 2013

Researchers have identified the molecular mechanisms behind two rare diseases: giant axonal neuropathy and ovarian cancer. In GAN, mutations in gigaxonin disrupt neural protein degradation, leading to neurofilament accumulation. Meanwhile, ATP11B facilitates cisplatin resistance in ovarian cancer cells by mediating platinum export.

SourceJCI Journals·JournalJournal of Clinical Investigation·DateApr 15, 2013

Cancer cell metabolism kills

Researchers at the University of Helsinki discovered that the Myc oncoprotein makes cancer cells vulnerable to cell death by activating AMPK, a biochemical sensor. This leads to the activation of tumor suppressor protein p53, which promotes apoptosis in cancer cells.

SourceUniversity of Helsinki·JournalProceedings of the National Academy of Sciences·DateApr 15, 2013

A shortcut to timely, cost-effective interventions for HIV

A mathematical model developed by Yale researchers predicts that combining multiple interventions could prevent up to two-thirds of future HIV infections and reduce prevalence from 19% to 10% in 10 years. The study suggests increasing male circumcision, more frequent screening, and antiretroviral therapy as the most effective strategies.

SourceSpringer·JournalJournal of General Internal Medicine·DateApr 15, 2013

Mammogram tool improves some breast cancer detection but also increases false alarms

A new study found that computer-assisted detection (CAD) in mammograms improves the detection of noninvasive and early-stage invasive breast cancer, but also makes more mistakes. CAD was associated with higher rates of ductal carcinoma in situ (DCIS) diagnoses and increased diagnostic testing among women without breast cancer.

SourceUniversity of California - Davis Health·JournalAnnals of Internal Medicine·DateApr 15, 2013

Surprising findings on hydrogen production in green algae

Researchers at Uppsala University found that green algae can produce hydrogen gas directly from sunlight, with up to 80% of the energy absorbed by Photosystem II going into production. This discovery changes the view on hydrogen production in green algae and offers hope for efficient renewable energy source.

SourceUppsala University·JournalProceedings of the National Academy of Sciences·DateApr 15, 2013

National study of scientist-educators reveals surprises in training, funding

A national study published in PNAS found that US science faculty with education specialties have varying levels of formal training in science education, but are more likely to receive grant money at Ph.D.-granting institutions. Despite this, there is an intriguing disconnect between training and funding outcomes for these faculty members.

SourceSan Francisco State University·JournalProceedings of the National Academy of Sciences·DateApr 15, 2013

Photons run out of loopholes

Researchers from the University of Vienna have closed a loophole for photons, providing definitive experimental proof that quantum particles can exhibit non-classical behavior. The study uses entangled photon pairs and advanced detection technology to rule out possible explanations for previous results.

SourceUniversity of Vienna·JournalNature·DateApr 15, 2013

Fires in Nepal

Nepal and India experience widespread agricultural fires, burning in the April 13, 2013 image from NASA's MODIS satellite. The Moderate Resolution Imaging Spectroradiometer (MODIS) detected actively burning areas, which are outlined in red.

Plant protein puzzle solved

Researchers from North Carolina State University have created a 3D model of an enzyme that links glucose to cellulose, a crucial component of plant cell walls. The breakthrough could enable genetic engineering of plants and trees for improved fibers or wood strength.

SourceNorth Carolina State University·JournalProceedings of the National Academy of Sciences·DateApr 15, 2013

La Jolla Institute's surprising finding could alter the face of dengue vaccine development

Researchers at the La Jolla Institute discovered that T cells contribute to host protection against dengue virus infection, contradicting current scientific understanding. This finding may lead to a new approach in dengue vaccine design, potentially improving its effectiveness against the deadly disease.

SourceLa Jolla Institute for Immunology·JournalProceedings of the National Academy of Sciences·DateApr 15, 2013

Preventing cognitive decline in healthy seniors

A review of 32 randomized controlled trials suggests that mental exercise, such as computerized training programs or intensive one-on-one personal cognitive training, may benefit older adults in preventing cognitive decline. The annual rate of dementia-related cognitive decline is estimated to double to over 1 million Canadians by 2047.

SourceCanadian Medical Association Journal·JournalCanadian Medical Association Journal·DateApr 15, 2013

In sex, happiness hinges on keeping up with the Joneses, CU-Boulder study finds

A CU-Boulder study found that people reported higher levels of happiness as they reported higher sexual frequency, but also believed their peers were having less sex than them. This 'relative aspect' of sex frequency increases happiness, suggesting social comparisons play a role in the relationship between sex and happiness.

SourceUniversity of Colorado at Boulder·JournalSocial Indicators Research·DateApr 15, 2013

Gene-expression signature may signify risk for recurrence, metastasis in prostate cancer

Researchers at Massachusetts General Hospital identified a genetic signature associated with the risk of tumor recurrence or spread in men surgically treated for prostate cancer. The 32-gene index proved to be the most accurate method, predicting actual incidence of tumor recurrence (47%) and metastasis (14%) among high-risk patients.

SourceMassachusetts General Hospital·JournalProceedings of the National Academy of Sciences·DateApr 15, 2013

Smartphone way to lose weight

A new smartphone app, My Meal Mate, has been shown to be effective in helping users track their food intake and exercise for weight loss. The app resulted in an average weight loss of 4.6kg (10lbs) over six months, compared to 2.9kg (6.5lbs) and 1.3kg (3lbs) with a paper-based diary and online diary, respectively.

SourceUniversity of Leeds·JournalJournal of Medical Internet Research·DateApr 15, 2013

Fish prone to melanoma get DNA decoded

Researchers have decoded the platyfish genome, revealing insights into cancer development and complex behaviors. The study found altered genes involved in live-bearing birth and unique molecular changes, shedding light on the evolution of these traits.

SourceWashU Medicine·JournalNature Genetics·DateApr 15, 2013

'Comparison shopping' by doctors saves money

A study at Johns Hopkins Hospital found that providing physicians with upfront price transparency for laboratory tests resulted in a 9% decrease in test orders and significant cost savings. The practice decreased overall use of tests, saving hundreds of thousands of dollars over six months.

SourceJohns Hopkins Medicine·JournalJAMA Internal Medicine·DateApr 15, 2013