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Science News for July 20, 2011


For kids, it's more than just a game

Research by Jean Cæté found that positive youth sports experiences are associated with coaches creating inclusive team environments, assessing individual progress rather than comparison, and providing challenging practices. This fosters initiative, motivation, and citizenship qualities in young players.

SourceQueen's University·JournalThe Sport Psychologist·DateJul 20, 2011

Evolution provides clue to blood clotting

Scientists at Washington University School of Medicine used evolutionary clues to reveal how a key clotting protein assembles. They found that two histidines play a crucial role in sensing pH changes and guiding the assembly of von Willebrand Factor, leading to new insights into common bleeding disorders.

SourceWashU Medicine·JournalJournal of Biological Chemistry·DateJul 20, 2011

Fantastic Mrs. Fox

A new study by University of Bristol biologists found that mother foxes determine which cubs stay and which leave their family groups, with dominant females playing a crucial role in dispersal strategy. This unique discovery sheds light on the evolution of social behavior in mammals.

SourceUniversity of Bristol·JournalPLOS ONE·DateJul 20, 2011

Seeing the S-curve in everything

A new theory by Adrian Bejan, known as the constructal law, predicts the prevalence of S-curves in various fields, including biology, chemistry, and economics. The S-curve pattern is a natural design for flow systems to facilitate access, reducing friction or resistance.

SourceDuke University·JournalJournal of Applied Physics·DateJul 20, 2011

Nevada School of Medicine researcher finds caffeine consumption, female infertility link

Researchers at the University of Nevada School of Medicine discovered that caffeine inhibits the actions of pacemaker cells in Fallopian tube walls, reducing egg movement and potentially leading to infertility. This finding provides an explanation for why women with high caffeine consumption tend to take longer to conceive.

SourceUniversity of Nevada, Reno·JournalBritish Journal of Pharmacology·DateJul 20, 2011

Unlisted ingredients in teas and herbal brews revealed in DNA tests by high school students

A study published in the Nature journal Scientific Reports found that many tea and herbal products contain unlisted ingredients, including weeds and plants from various families. The research used DNA barcoding technology to identify unknown species in 70 tea products and 60 herbal products, revealing a total of 25 unexpected ingredients.

SourceRockefeller University·JournalScientific Reports·DateJul 20, 2011

First global study of real-world circumcision rollout conducted over 3-year period in South Africa amongst 110,000 adults shows a marked reduction (>60 percent) of HIV acquisition among circumcised adult men

A global study of real-world circumcision rollout in South Africa found a marked reduction (>60 percent) of HIV acquisition among circumcised adult men. This is the first time such a large-scale community-level intervention has shown effectiveness in curbing HIV transmission.

Safety testing on Gulf seafood

A monitoring and testing program has consistently shown amounts of toxic substances in Gulf seafood 100-1,000 times smaller than health concerns. Safety monitoring continues despite lingering concerns among scientists and consumers.

SourceAmerican Chemical Society·JournalChemical & Engineering News·DateJul 20, 2011

No room for inaccuracy in the brain

Dr. Ed Ruthazer's study shows that environmental stimulation enhances visual acuity and refines nerve cell connections in developing brains. The research identifies molecular mechanisms underlying the changes, including the activation of Brain Derived Neurotrophic Factor (BDNF), which plays a key role in plasticity.

SourceMcGill University·JournalNeuron·DateJul 20, 2011

Newly designed molecule blocks chlamydia bacteria

Researchers at Duke University Medical Center have developed a molecule that blocks the damaging actions of Chlamydia by disarming its self-defense mechanisms. The therapy will disarm CPAF, a central weapon of Chlamydia, allowing the body to take care of the rest and ultimately lead to the death of the infected cell and the bacteria.

SourceDuke University Medical Center·JournalCell Host & Microbe·DateJul 20, 2011

Researchers present new trends in HIV cure research, call for proactive outreach programs to prevent HIV transmission in injecting drug users, and demand increased commitments to improving maternal and child health

Researchers focus on HIV cure research, highlighting the need for proactive outreach programs to prevent transmission in injecting drug users. The conference also emphasizes the importance of improving maternal and child health in sub-Saharan Africa and Southeast Asia.

Battle of the bugs

Bacteria Pseudomonas aeruginosa uses a toxin delivery system called Type VI secretion system (T6SS) to break down rival bacteria's protective barriers. The mechanism also helps the bacterium protect itself from its own toxins, making it a major public health concern.

SourceUniversity of Washington·JournalNature·DateJul 20, 2011

Controlling movements with light

Using optogenetics, researchers were able to target one cell type and influence activity of nerve cells with laser light. The study found that activation of a specific G-protein-coupled receptor changed the activity pattern of Purkinje cells, leading to motor deficits in mice.

SourceRuhr-University Bochum·JournalBiological Chemistry·DateJul 20, 2011

E-cigarette or drug delivery device?

Researchers argue that e-cigarettes are crude drug delivery systems for refined nicotine, posing safety concerns due to poor quality control and variability in nicotine content. The devices also have not been sufficiently evaluated in scientific studies, making them ineffective as quitting aids for smokers.

SourceGeorgetown University Medical Center·JournalNew England Journal of Medicine·DateJul 20, 2011