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Science News for August 25, 2010


A novel method for collecting dolphin DNA

Researchers at Georgetown University and the National Aquarium successfully extracted DNA from dolphin blow, providing an alternative to biopsies. The new method involves collecting exhalations from blowholes, eliminating harm to young animals and requiring less skill than traditional dart biopsying.

SourcePLOS·JournalPLOS ONE·DateAug 25, 2010

Wild porcupines under threat due to illegal hunting

Research from the University of East Anglia has shown that commercial farming of porcupines is driving hunting and contributing to a devastating decline of wild populations. The study found that half of farmers interviewed were unregistered, with many using wild animals as founder stock or capturing them for sale.

SourceUniversity of East Anglia·JournalBiological Conservation·DateAug 25, 2010

Why fish don't freeze in the Arctic Ocean

Researchers from Ruhr-University Bochum discovered a new mechanism of how Antarctic fish blood prevents freezing at temperatures as low as -1.8°C. The antifreeze glycoproteins work by perturbing the aqueous solvent over long distances, rather than forming a single molecular binding.

SourceRuhr-University Bochum·JournalJournal of the American Chemical Society·DateAug 25, 2010

Vitamin D may treat and prevent allergic reaction to mold in cystic fibrosis patients

Researchers found that vitamin D can reduce the production of a protein driving an allergic response in cystic fibrosis patients and increase production of proteins promoting tolerance. The findings support a potential clinical trial to prevent or treat Allergic Bronchopulmonary Aspergillosis (ABPA) in these patients.

SourceUniversity of Pittsburgh Schools of the Health Sciences·JournalJournal of Clinical Investigation·DateAug 25, 2010

Where the fat's at

A team of UC San Diego researchers has created a novel map of lipid locations in a single cell, providing insights into how lipids influence disease processes. The study identified over 220 individual molecular lipid species and found that numerous lipids change in abundance once a macrophage becomes active.

SourceUniversity of California - San Diego·JournalJournal of Lipid Research·DateAug 25, 2010

Octopus mimics flatfish and flaunts it

Researchers analyzed DNA sequences to understand how the Thaumoctopus mimicus evolved its ability to impersonate flatfish, displaying high-contrast color patterns. The study found that this trait is an extremely risky defense strategy, but one that allows the octopus to survive and reproduce more successfully in its habitat.

SourceCalifornia Academy of Sciences·JournalBiological Journal of the Linnean Society·DateAug 25, 2010

JCI table of contents: Aug. 25, 2010

Two independent research groups demonstrate that induced pluripotent stem cells can be used to model diseases of the liver and generate functional hepatocytes with proliferative capabilities. These findings expand our understanding of iPS cell technology's potential for cell replacement therapy and modeling human disease.

SourceJCI Journals·JournalJournal of Clinical Investigation·DateAug 25, 2010

Waiting for the right moment

Pathogens such as Neisseria gonorrhoeae use a delayed entry strategy to survive in the human body, strengthening cellular skeletons and anchoring to cell surfaces. This new understanding may have exciting implications for preventing infection with various bacterial agents.

SourceMax-Planck-Gesellschaft·JournalPLOS Biology·DateAug 25, 2010

Sad mothers have small babies

A study in rural Bangladesh found that women with depression and anxiety during pregnancy gave birth to smaller babies, which are more likely to die in infancy. The research highlights the importance of mental health support services to reduce child mortality in developing countries.

SourceBMC (BioMed Central)·JournalBMC Public Health·DateAug 25, 2010

BPA and testosterone levels

A large population study found a statistically significant association between BPA exposure and increased testosterone levels in men. The study, which analyzed data from over 700 adults aged 20-74 years, suggests that even low-level exposure to BPA may have endocrine-disrupting effects on human health.

SourceThe Peninsula College of Medicine and Dentistry·JournalEnvironmental Health Perspectives·DateAug 25, 2010

Arizona researchers create tests to assess Down syndrome

Researchers at the University of Arizona have developed a battery of computer-based tests that can quickly assess cognitive abilities in individuals with Down syndrome. The tests, which take about two hours to administer, offer a new tool for clinicians and researchers to determine developmental trajectory and devise drug and behaviora...

SourceUniversity of Arizona·JournalJournal of Neurodevelopmental Disorders·DateAug 25, 2010

Co-products and cornstalk residue can cut cow feed costs by a dollar a day

Researchers at the University of Illinois found that feeding co-products and cornstalk residue in winter can reduce cow feed costs by up to $1 per day. The study compared various feeding methods and delivery systems, finding that smaller herds can save money by feeding free-choice cornstalk residue and handfeeding DDGS.

Evolution writ small

Researchers at Rice University studied bacteria in a competition for evolutionary dominance, finding specific genetic mutations that imparted physical advantages. These mutations were linked to increased resistance to temperature changes and protein misfolding, which may be related to human diseases like Alzheimer's.

SourceRice University·JournalMolecular Systems Biology·DateAug 25, 2010

Copy number variation found to cause rare kidney disease

Researchers have identified a rare form of kidney disease linked to a genetic mutation in the innate immune system, causing progressive kidney malfunction and blood in urine. The condition, named CFHR5 nephropathy, has been found in over 100 people of Cypriot descent and is potentially serious but can be detected through DNA testing.

SourceWellcome Trust·JournalThe Lancet·DateAug 25, 2010