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Science News for April 2, 2007


Mammograms for women in their 40s should be based on individual

The American College of Physicians recommends that mammography screening decisions be made on a case-by-case basis, considering each woman's individual cancer risk and preference. The new guidelines acknowledge the benefits and harms of screening, recommending periodic assessment of breast cancer risk to inform decision-making.

SourceStanford Medicine·JournalAnnals of Internal Medicine·DateApr 2, 2007

Biofeedback treats one type of chronic constipation

Researchers at the University of Iowa found that biofeedback treatment can correct bowel function in nearly 80% of patients with dyssynergic defecation. The study compared biofeedback to standard treatment of laxatives, diet, and exercise, and found that biofeedback was significantly more effective in improving muscle function.

SourceUniversity of Iowa·JournalClinical Gastroenterology and Hepatology·DateApr 2, 2007

Joslin study indicates insulin receptors play a critical role in promoting islet growth

A Joslin-led study identified insulin receptors as crucial for promoting beta cell growth, a potential target for treating type 2 diabetes. The research found that mice lacking insulin receptors failed to grow more islet cells, highlighting the importance of insulin receptors in overcoming insulin resistance.

SourceJoslin Diabetes Center·JournalProceedings of the National Academy of Sciences·DateApr 2, 2007

New placenta screening for high-risk pregnancies

Researchers at Mount Sinai Hospital in Toronto have developed a non-invasive screening test to detect placental damage in high-risk pregnancies. The test, which combines ultrasound and blood tests, can identify abnormal placental function at 16-23 weeks gestation, allowing for early intervention and improved pregnancy outcomes.

SourceUniversity of Toronto·JournalAmerican Journal of Obstetrics and Gynecology·DateApr 2, 2007

New homes rise from rubbish

Researchers have created a building block made almost entirely of recycled glass, metal slag, and other waste products, aiming to revolutionize the construction industry. The 'Bitublock' is estimated to reduce energy consumption by up to 50% and use an estimated 400,000 tonnes of crushed glass annually.

Is there such a thing as too much sugar?

A study published in JCI Journals found that glucose reperfusion triggers more extensive neuronal death in hypoglycemic mice than prolonged hypoglycemia itself. Gradual increase of blood glucose levels may be a better approach to treat individuals in hypoglycemic coma, but the findings are subject to further clarification.

SourceJCI Journals·JournalJournal of Clinical Investigation·DateApr 2, 2007

Laser goes tubing for faster body-fluid tests

Researchers at the University of Rochester have created a laser-based technique that measures multiple chemicals in body fluids in under 60 seconds, offering non-destructive and fast testing capabilities. The technique uses Raman spectroscopy and low-refractive-index tubes to improve signal strength and accuracy.

SourceUniversity of Rochester·JournalApplied Optics·DateApr 2, 2007

Flexible electronics could find applications as sensors, artificial muscles

Researchers at Argonne National Laboratory have developed flexible electronic structures that can bend, expand, and manipulate devices, paving the way for applications in sensors and artificial muscles. These structures were created by forming single-crystalline semiconductor nanoribbons in stretchable geometrical configurations.

SourceDOE/Argonne National Laboratory·JournalJournal of Materials Chemistry·DateApr 2, 2007

JCI table of contents: April 2, 2007

Researchers found that hypoglycemic neuronal death is triggered by glucose reperfusion and activation of NADPH oxidase. Treatment with CD40Ig allows rats to accept heart grafts from non-genetically identical donors by enhancing regulatory immune cells.

SourceJCI Journals·JournalJournal of Clinical Investigation·DateApr 2, 2007

Forest elephants at risk from the illegal ivory trade

A new study warns that forest elephants are facing intense poaching pressure due to the illegal ivory trade. The researchers found only 1,900 elephants remaining in Salonga National Park, with the probability of encountering them increasing with distance from roads.

SourcePLOS·JournalPLOS Biology·DateApr 2, 2007

University of Colorado study shows intensive therapy helps in battle against bipolar disorder

A University of Colorado study found that intensive psychotherapy added to medication significantly improved bipolar disorder symptoms, with patients experiencing better mental health faster. The research also highlighted the importance of family-focused therapy in stabilizing daily routines and coping strategies.

SourceUniversity of Colorado at Boulder·JournalArchives of General Psychiatry·DateApr 2, 2007

First impressions: Computer model behaves like humans on visual categorization task

A new computer model developed at the McGovern Institute for Brain Research at MIT has been shown to perform as well as humans on rapid visual categorization tasks, even making similar errors. The model follows the organization of the brain's visual system and can help neuroscientists explore brain mechanisms involved in human visual p...

SourceMcGovern Institute for Brain Research·JournalProceedings of the National Academy of Sciences·DateApr 2, 2007

High-dose inhaled corticosteroid use for COPD could cut risk of lung cancer

Researchers found that regular high-dose inhaled corticosteroid use among COPD patients lowered the risk of developing lung cancer. The study, published in the American Journal of Respiratory and Critical Care Medicine, found a significant reduction in relative risk for users of over 1,200 micrograms per day.

SourceAmerican Thoracic Society·JournalAmerican Journal of Respiratory and Critical Care Medicine·DateApr 2, 2007

Weight gain in pregnancy linked to overweight in kids

A new study found that pregnant women who gain excessive or adequate weight are four times more likely to have an overweight child. The study suggests reevaluating current pregnancy weight guidelines, as excessive weight gain during pregnancy can influence child health and increase the risk of obesity.

SourceHarvard Medical School·JournalAmerican Journal of Obstetrics and Gynecology·DateApr 2, 2007

China's earliest modern human

A 40,000-year-old human skeleton found in China suggests that modern humans may have migrated to the region via multiple routes rather than a single 'out of Africa' event. The discovery provides valuable insights into the emergence of modern humans in eastern Asia.

SourceWashington University in St. Louis·JournalProceedings of the National Academy of Sciences·DateApr 2, 2007

A changing climate for protected areas

A study by Conservation International finds that existing protected areas remain effective in the early stages of climate change, but adding new ones would maintain species protection in future decades and centuries. The research concludes that anticipating the need for new protected areas and getting them created in the short term wil...

SourceConservation International·JournalFrontiers in Ecology and the Environment·DateApr 2, 2007

Strokes may be associated with cocaine and amphetamine abuse

A study published in Archives of General Psychiatry found a significant association between cocaine and amphetamine abuse and an increased risk of stroke. The use of these stimulant drugs may raise blood pressure and contribute to narrowing blood vessels, leading to an increased risk of hemorrhagic and ischemic strokes.

SourceJAMA Network·JournalArchives of General Psychiatry·DateApr 2, 2007

Rapid response was crucial to containing the 1918 flu pandemic

Historical analyses of the 1918 Spanish influenza pandemic reveal that cities with early public health measures had lower peak weekly death rates and overall mortality compared to those that waited. Implementing multiple social containment measures within a few days of first local cases recorded cut peak death rates by up to half.

SourceNIH/National Institute of Allergy and Infectious Diseases·JournalProceedings of the National Academy of Sciences·DateApr 2, 2007

Why the rich get richer

Researchers discovered that power-law distributions are common in various systems, including the internet, due to the 'rich get richer' effect. This phenomenon can be influenced by tradeoffs between network distance and connection numbers.

SourceUniversity of California - Davis·JournalProceedings of the National Academy of Sciences·DateApr 2, 2007

Autism costs society an estimated $3M per patient

A study estimates that individuals with autism incur approximately $35 billion in annual costs to society, primarily due to lost productivity and adult care. These costs can be felt well into adulthood, highlighting the need for financial planning and counseling for families of children with autism.

SourceJAMA Network·JournalArchives of Pediatrics and Adolescent Medicine·DateApr 2, 2007

Elephant highways of death

A new study reveals that forest elephants are being pushed into remote depths of national parks due to heavy poaching for ivory near roadways. Protected areas, however, are critical to elephant survival, with some areas experiencing increased abundance despite road access.

SourceWildlife Conservation Society·JournalPLOS Biology·DateApr 2, 2007

Study finds lack of health insurance may be associated with increased rates of stroke

A study found that individuals without health insurance are more likely to forego routine physical exams and have a higher risk of unawareness of high blood pressure, diabetes, or high cholesterol levels. Hypertension is the most powerful risk factor for stroke, and those without insurance had poorly controlled hypertension.

SourceBeth Israel Deaconess Medical Center·JournalJournal of General Internal Medicine·DateApr 2, 2007

U of MN study finds that primary medical care for children with autism needs improvement

A University of Minnesota study found that parents of children with autism are less likely to report receiving ideal primary care compared to parents of children with other special health care needs. Parents reported difficulties obtaining subspecialty care and challenges in receiving family-centered, comprehensive, and coordinated care.

SourceUniversity of Minnesota·JournalArchives of Pediatrics and Adolescent Medicine·DateApr 2, 2007