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Science News Archive July 2007 - Page 13


Page 13 of 16

Highlights from the July 2007 Journal of the American Dietetic Association

A study found that Canadian fifth-graders prefer larger portions of snacks and fast food but smaller portions of vegetables, with a significant gender gap in portion sizes. The researchers also discovered that children who frequently eat at fast-food restaurants or watch TV while eating are more likely to consider large portions as 'us...

SourceAmerican Dietetic Association·JournalJournal of the American Dietetic Association·DateJul 6, 2007

Electronic 'crowd behavior' revealed in semiconductors

Researchers at JILA discovered a previously unseen type of collective electronic behavior in semiconductors, shedding light on interactions between microscopic particles. The study used ultrafast lasers to analyze the phase shift of light, confirming the importance of collective exciton behavior and its superiority over simpler models.

SourceNational Institute of Standards and Technology (NIST)·JournalProceedings of the National Academy of Sciences·DateJul 6, 2007

Search engine mashup

A new search engine mashup uses intelligent virtual robots to scan data quickly, assessing keywords and context, and combining it with meta search tools to retrieve relevant results. This approach improves the precision rate and recall rate of traditional search engines.

SourceInderscience Publishers·JournalInternational Journal of Agent-Oriented Software Engineering·DateJul 6, 2007

Paracetamol overdoses drop without package size legislation

A Canadian study found that paracetamol overdose rates decreased significantly between 1995 and 2004, with a notable drop in hospitalizations among young women and Aboriginal populations. The lack of package size restrictions in Canada contributed to this decline, contrasting with the UK's successful implementation of smaller pack sizes.

SourceBMC (BioMed Central)·JournalBMC Public Health·DateJul 5, 2007

Engineered blood vessels function like native tissue

Researchers at University at Buffalo developed a method to isolate functional smooth muscle cells from bone marrow, which can be used in regenerative medicine for cardiovascular applications. The engineered blood vessels function similarly to native tissue, demonstrating potential as an alternative to venous grafts.

SourceUniversity at Buffalo·JournalCardiovascular Research·DateJul 5, 2007

Tracing Parkinson's lethal mechanism

In mice and human patients, researchers found that crippling of protective enzyme Prx2 leads to death of dopamine-producing neurons in Parkinson's disease. Activating Prx2 prevents neuronal loss, suggesting it as a beneficial target for PD treatment.

SourceCell Press·JournalNeuron·DateJul 5, 2007

Protein's role in lipid absorption may be important to future weight-loss strategies

Researchers at Washington University School of Medicine have found that protein CD36 facilitates the uptake of fatty acids and cholesterol in the proximal part of the intestine. The team believes that targeting this process may provide a useful tool for obesity treatment, as animals without CD36 absorb fat less efficiently and eat less.

SourceWashU Medicine·JournalJournal of Biological Chemistry·DateJul 5, 2007

Pre-exposure prophylaxis for HIV infection

Several phase II and III trials investigate anti-retroviral drug combinations for pre-exposure prophylaxis among at-risk populations. The implementation of such a program requires careful planning and substantial resources to ensure access, minimize risk behavior, and prevent drug-resistant strains.

SourceThe Lancet_DELETED·JournalThe Lancet·DateJul 5, 2007

Stopping the HIV pandemic in children

Early HIV testing for exposed infants can prevent infection before AIDS or death, allowing for prophylaxis or treatment implementation. Universal availability of prophylaxis or treatment is crucial, but poses challenges such as long-term toxic effects of anti-retroviral treatment.

SourceThe Lancet_DELETED·JournalThe Lancet·DateJul 5, 2007

From the corner of the eye: Paying attention to attention

Researchers distinguish between two classes of brain cells with distinct roles in visual attention and highlight mechanisms by which they mediate attention. They found that neurons respond more strongly when attention is directed to the stimulus in their receptive fields, with narrow-spiking cells firing more frequently under attention.

SourceSalk Institute·JournalNeuron·DateJul 5, 2007

The new 'look' of superconductivity

Researchers at Ames Laboratory have observed two-dimensional equilibrium patterns in lead samples when in its superconducting state, below 7.2 Kelvin. These complex patterns differ from the long-held textbook model proposed by Lev Landau and represent a significant contribution to the field of superconductivity.

Do women really talk more than men?

A study published in Science debunks the popular stereotype that females use more words than men, revealing both sexes use an average of 16,000 words per day. The research used a digital voice recorder to track daily interactions over eight years and analyzed transcripts from nearly 400 university students.

SourceUniversity of Texas at Austin·JournalScience·DateJul 5, 2007

Holograms make for better vision tests

Researchers developed a one-step test using holograms to diagnose astigmatic error, a key factor in prescribing glasses. The new technique is simpler and faster than traditional methods, which involve multiple lenses and complex processes.

SourceOptica·JournalOptics Letters·DateJul 5, 2007

How pain distracts the brain

Researchers identified the lateral occipital complex as a region affected by both working memory load and pain, but found that pain influences visual processing through the rostral anterior cingulate cortex. This modulation affects accuracy in recognizing images.

SourceCell Press·JournalNeuron·DateJul 5, 2007

Chemical in brain acts like a fuel gauge

Researchers at USC have found that norepinephrine transmits a 'low blood sugar' message from the hindbrain to the paraventricular hypothalamus, triggering the release of energy stores to replace missing sugars. This discovery provides new insights into glucose sensing mechanisms in the brain and may hold potential for treating diabetic...

Challenges to development of an AIDS vaccine

HIV's uniformly fatal outcome and absence of natural immunity pose significant hurdles for vaccine design. The authors call for increased funding for research and clinical trials to address these challenges and accelerate progress in finding an effective AIDS vaccine.

SourceThe Lancet_DELETED·JournalThe Lancet·DateJul 5, 2007

South Asian Scots have increased risk of heart attacks

A recent study by the University of Edinburgh found that South Asian Scots are more likely to suffer a heart attack than the rest of the Scottish population. The research, which linked census data to hospital discharge records, revealed an 80% higher incidence of heart attacks among South Asian women and a 45% higher incidence among men.

SourceBMC (BioMed Central)·JournalBMC Public Health·DateJul 5, 2007