817,292 articles

New Record For Brightness Of Quantum Dots Set

By placing quantum dots on a specially designed photonic crystal, researchers have demonstrated enhanced fluorescence intensity by a factor of up to 108. Potential applications include high-brightness light-emitting diodes, optical switches and personalized, high-sensitivity biosensors.

New Use For Stem Cells Found In War On Terrorism

For more than a decade, Steve Stice has dedicated his research using embryonic stem cells to improving the lives of people with degenerative diseases and debilitating injuries. His most recent discovery, which produces billions of neural cells from a few stem cells, could now aid in national security. In collaboration with the US Naval Research Laboratory, Stice hopes to use his recently developed...

Nonconscious Visual Attention System Identified In Humans

For our hunter-gatherer ancestors, wild animals generally represented either a food source or a potential danger. Detecting an animal's immediate presence and then monitoring its movements was vital to the physical safety, nutrition, and well-being of stone-age families. Now scientists have identified a nonconscious attention system, which still exists in the human brain, that maintains awareness...

Pollution Drives Frog Deformities By Ramping Up Infections

High levels of nutrients used in farming and ranching activities fuel parasite infections that have caused highly publicized frog deformities in ponds and lakes across North America, according to a new study. The study showed increased levels of nitrogen and phosphorus cause sharp hikes in the abundance and reproduction of a snail species that hosts microscopic parasites known as trematodes. The...

Primate Sperm Competition: Speed Matters

Sperm cells from the more promiscuous chimpanzee and rhesus macaque species swim much faster and with much greater force than those of humans and gorillas, species where individual females mate primarily with only one male during a reproductive cycle.

Public Awareness Of Nanotechnology Stuck At Low Level, According To Polls

National survey findings just released indicate that Americans' awareness of nanotechnology remains low. Popular awareness is nearly as small as the tiny nanoscale materials and nano-enabled devices and products now flowing onto the market from this rapidly progressing technology that experts believe will usher in a new industrial revolution.

Sense Of Taste Different In Women With Anorexia Nervosa

Although anorexia nervosa is categorized as an eating disorder, it is not known whether there are alterations of the portions of the brain that regulates appetite. Now, a new study finds that women with anorexia have distinct differences in the insulta -- the specific part of the brain that is important for recognizing taste.

Stem Cells Show Promise For Treating Huntington's Disease

Paying close attention to how a canary learns a new song has helped scientists open a new avenue of research against Huntington's disease -- a fatal disorder for which there is currently no cure or even a treatment to slow the disease. Scientists used gene therapy to guide the development of endogenous stem cells in the brains of mice affected by a form of Huntington's, generating new medium spiny...

Toll Charges Reduce Travel Time, Traffic Jams

A smart introduction of a variable toll charge, with different rates at different departure times, reduces traffic jams. Even small toll charges can exert a large effect on the total travel time, concludes a young Dutch researcher.

Toward A Music Search Engine That Lets You Type In Regular Words And Returns Songs

Electrical engineers and computer scientists are working together on a computerized system that will make it easy for people who are not music experts (like the senior author's mom) to find the kind of music they want to listen to -- without knowing the names of artists or songs. You type in regular words like "high energy instrumental with piano," "funky guitar solos" or "upbeat music with female...

Victims Of Child Maltreatment More Likely To Perpetrate Youth Violence, Intimate Partner Violence

Some people are caught in a cycle of violence, perhaps beginning with their own abuse as a child and continuing into perpetration or victimization as an adult. To interrupt this cycle, it is important to understand how childhood experiences are related to behavior later in life. Researchers are examining how forms of child maltreatment victimization and youth violence and young adult intimate...