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Science News for October 6, 1999


New model suggests that AIDS drugs may not abolish HIV infection

A new model of HIV decline during treatment suggests that antiretroviral therapy drives HIV down to stable levels, varying with drug efficacy. The model proposes that significant numbers of CD4+ T cells become infected with HIV after treatment initiation, leading to a gradual decline in viral load.

SourceNIH/National Institute of Allergy and Infectious Diseases·JournalNature Medicine·DateOct 6, 1999

Tiny tubes have a big future

Researchers have reported the highest and most stable electron emission densities observed to date, desirable for flat-panel displays and microwave amplifiers. The carbon nanotubes' sharp tip and chemical robustness contribute to their superior stability and uniform emission.

SourceOffice of Naval Research·JournalApplied Physics Letters·DateOct 6, 1999
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Estrogen may play role in prevention of cataracts

Researchers found that estrogen can reduce the risk of developing cataracts by up to 77%, with estradiol and estrone showing particular promise. The study used rats with induced ovarian failure to test the effects of different estrogens on cataract development.

SourceIndiana University·JournalProceedings of the National Academy of Sciences·DateOct 6, 1999

Lasers see red

A team at the Naval Research Laboratory has successfully demonstrated room-temperature operation of an interband III-V laser diode emitting at a wavelength beyond three microns. This achievement brings gallium-antimony-based technology closer to practical and portable mid-infrared systems needed for military and commercial applications.

SourceOffice of Naval Research·DateOct 6, 1999

NIAID spearheads collaborative network for clinical research on immune tolerance

The NIAID is spearheading a collaborative network to develop new ways of inducing immune tolerance, promising improvements in transplant success rates and treatment for autoimmune diseases. Researchers will conduct clinical trials using 'tolerogenic approaches' to selectively modulate the immune system.

SourceNIH/National Institute of Allergy and Infectious Diseases·DateOct 6, 1999

Researchers advocate improved breast cancer screening techniques

Researchers advocate for standardized examination techniques to improve physicians' precision and accuracy in screening for breast cancer. The study found that spending adequate time on the clinical breast examination (CBE) and using proper techniques can increase early detection of lumps in the breast.

SourceHarvard Medical School·DateOct 6, 1999
SAMSUNG T9 Portable SSD 2TB

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Long-QT syndrome

A Mayo Clinic study found that a genetic defect known as long-QT syndrome may be the cause of many unexplained drownings. The research identified a genetic mutation in a 19-year-old woman who died after a near-drowning, and subsequent testing revealed that her mother and sister also had inherited the condition.

SourceMayo Clinic·JournalNew England Journal of Medicine·DateOct 6, 1999

New materials from glass threads

Researchers at NRL have created a new type of glass material for use in future opto-electronic devices, which could lead to advancements in optical sensors, miniaturized optical systems, high-speed communication components, and more. The material's properties are highly dependent on its layered structure and composition.

SourceOffice of Naval Research·DateOct 6, 1999

The wonderful world of waves

The SHOWEX experiment aims to better predict wave formation and severity, improving navigation safety at sea and weather forecasting. Researchers will use a range of instruments, including aircraft, craft, buoys, and subsurface sensors, to study wave components and their interactions.

SourceOffice of Naval Research·DateOct 6, 1999
GQ GMC-500Plus Geiger Counter

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African ants' self-defense takes a heavy toll on hosts

Researchers find that African ants' pruning behavior increases colony life span, but harms host trees, sparking debate on ecological partnerships. The study sheds light on why weaker competitors can persist in diverse ecosystems.

SourceUniversity of California - Davis·JournalNature·DateOct 6, 1999