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Science News Archive December 2002 - Page 6


Page 6 of 7

Smoking reduction strategies show success

Studies suggest that smokers can reduce their smoking by using various strategies, including nicotine replacement devices and behavioral interventions. Researchers found that those who used multiple strategies smoked fewer cigarettes per day compared to those who relied on a single method.

SourceCenter for Advancing Health·JournalNicotine & Tobacco Research·DateDec 4, 2002

Cool sounds

Researchers at Penn State have developed a small 'thermoacoustic refrigerator' that uses sound energy to generate cooling, potentially replacing chemical refrigerants. The device operates near resonance frequencies and achieves efficiencies as high as 89% without lubricants or sliding seals.

Chilling with sound

Researchers at Penn State have developed a compact freezer case using sound waves to substitute chemical refrigerants, reducing greenhouse gas emissions. The Navy has funded the project and is exploring its potential for distributed cooling systems on carriers.

Portion size matters: Given too much, we eat it

A study published in the American Journal of Clinical Nutrition found that larger portion sizes result in consuming 30% more calories, regardless of individual eating habits. This suggests that portion control is crucial for weight management and suggests alternatives like low-calorie vegetables and broth-based soups.

SourcePenn State·JournalAmerican Journal of Clinical Nutrition·DateDec 3, 2002

JCI Table of Contents, December 2, 2002

Researchers have discovered that angiopoietin-1 can restore faulty blood vessel architecture in mice by promoting sprouting, survival, and stability of new vessels. This study highlights the importance of pericytes in maintaining normal vessel stability and may lead to new treatments for diseases like diabetic retinopathy.

SourceJCI Journals·JournalJournal of Clinical Investigation·DateDec 3, 2002

Birth control pills associated with breast cancer risk in BRCA1 mutation carriers

A study found that long-term oral contraceptive use is associated with a 33% increase in breast cancer risk among women with BRCA1 mutations, particularly those who started using contraceptives before age 30. In contrast, no significant increase in breast cancer risk was observed in women with BRCA2 mutations.

SourceJournal of the National Cancer Institute·JournalJNCI Journal of the National Cancer Institute·DateDec 3, 2002

Even green pond scum can suffer from jet lag

Researchers have successfully determined the structure of a biological clock protein called KaiC in blue-green algae, shedding light on internal clock mechanisms. The protein's ring-like hexagonal structure suggests it interacts directly with DNA, potentially regulating gene expression and controlling the wake-sleep cycle.

SourceVanderbilt University·JournalProceedings of the National Academy of Sciences·DateDec 2, 2002

Mapping with math

Arjun Heimsath and Hany Farid developed a new method to create 3D models of remote regions using 2D photographs, making it easier for researchers to predict landslides and erosion rates. The technique has limitations, such as requiring clear images of the ground surface and a good point of view.

Felling antenna forests

The Office of Naval Research (ONR) is developing an Advanced Multi-Function Radio-Frequency Concept (AMRF-C) antenna aperture that can integrate radar and communications functions, reducing the need for separate antennas and increasing stealth.

Infants go to school early on grammar

A Purdue University psychology professor's research reveals infants can comprehend words and grammar from a young age, defying the common notion of gradual learning. By analyzing infant responses to language experiments, Hollich's study shows that babies as young as 5 months old demonstrate surprising linguistic savvy.