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156,752 articles from ScienceDaily

Smokers Are More Likely To Develop Dementia

People who smoke are more likely to develop Alzheimer's disease or dementia than nonsmokers or those who smoked in the past, according to a new study. The study followed nearly 7,000 people age 55 and older for an average of seven years. Over that time, 706 of the participants developed dementia. People who were current smokers at the time of the study were 50 percent more likely to develop...

The Bonobo Handshake

What's it like to work with relatives who think sex is like a handshake, who organize orgies with the neighbors, and firmly believe females should be in charge of everything? On September 11, a group of young researchers will head to the Congo to study our mysterious cousin, the bonobo.

Tiny Carbon Nanotubes Show Big Germ-fighting Potential

In nanoscience's version of a David-and-Goliath story, scientists are reporting the first direct evidence that carbon nanotubes have powerful antimicrobial activity, a discovery that could help fight the growing problem of antibiotic resistant infections. Their research is in the area of single-walled carbon nanotubes.

What Men And Women Really Want In a Mate

While humans may pride themselves on being highly evolved, most still behave like the stereotypical Neanderthals when it comes to choosing a mate, according to new research. The researchers found that though individuals may claim otherwise, beauty is the key ingredient for men while women, the much choosier of the sexes, leverage their looks for security and commitment.


SUNDAY 2. SEPTEMBER 2007


Aluminum In Breast Tissue: A Possible Factor In The Cause Of Breast Cancer

A new study has identified a regionally-specific distribution of aluminum in breast tissue which may have implications for the cause of breast cancer. Scientists have found that the aluminum content of breast tissue and breast tissue fat was significantly higher in the outer regions of the breast, in close proximity to the area where there would be the highest density of antiperspirant.

Baby's Conception And Birth Can Influence Dream Content In New Moms

The conception and birth of a child are emotional events that influence the dreams of most new mothers. In a surprisingly high number of cases, this influence reflects negative aspects of maternal responsibility, depicting the new infant in dreamed situations of danger and provoking anxiety in the mother that often spills over into wakefulness. These kinds of dreams are also accompanied by complex...

Faster Climate Change Means Bigger Problems

The debate about what constitutes "dangerous anthropogenic interference with the climate" has almost exclusively focused on how much the temperature can be allowed to increase. But we have perhaps just as much reason to be concerned about how quickly these changes take place. The UN Framework Convention on Climate Change (UNFCCC) aims to avoid what is called "dangerous anthropogenic interference...

Rosetta's Target Comet: Lumpy, Bumpy, Fluffy And Layered

Observational and theoretical studies of Comet 67P/Churyumov-Gerasimenko, the target of ESA's Rosetta mission, are building a detailed portrait of the comet's nucleus as it travels around the Sun. Surprisingly, although the comet was not active, they found that a faint dust trail is visible in the images of the comet, extending more than 500 000 km along the comet's orbital path.

Up, Up And Away -- To Venus

Scientists hope to learn more about climate changes here on Earth by studying Venus. A prototype balloon could eventually study the planet's surface and examine its atmosphere and the bizarre winds and chemistry within it. A team of JPL, ILC Dover and NASA Wallops Flight Facility engineers designed, fabricated and tested the balloon.

Biosensors To Probe The Metals Menace

New technology can warn people if their local water or air is contaminated with dangerous levels of toxic heavy metals and metal-like substances. They are studying the changes that take place in a unique water microbe when it is exposed to arsenic, cadmium and lead -- industrial and natural contaminants around the world.

Humpback Whales Recorded Clicking And Buzzing While Feeding For First Time

For the first time, researchers have recorded "megapclicks" -- a series of clicks and buzzes from humpback whales apparently associated with nighttime feeding behaviors -- in and around NOAA's Stellwagen Bank National Marine Sanctuary. This acoustically active species has been known to produce complex "songs" on their breeding grounds, but knowledge of sound production on northern feeding grounds...

Mice Used In Research Helpful In Multiple Research Areas

Mice that are part of the Collaborative Cross project at Oak Ridge National Laboratory are helping scientists around the world learn more about possible causes of drug abuse, diabetes, sleep disorders, stress and pain, kidney disease and a number of other conditions that affect millions of people.

Passive Smoking Could Cause 1.9 Million Excess Deaths From COPD In China

Exposure to passive smoking is linked to increased prevalence of chronic obstructive pulmonary disease (COPD). This association could cause 1.9 million excess deaths* among never smokers in China. The scientists found that people exposed to high levels of passive smoking (equivalent to 40 hours a week for more than five years) were on average 48% more likely to develop COPD.

Social, Church Activities May Protect Against Adolescent Smoking

Preventing youth smoking could take a village or a neighborhood. Church and school activities may help reduce smoking among youth in disadvantaged areas, according to a new survey. African-American youths reported less cigarette use overall than white youths. Across racial lines however, young people involved in extracurricular school activities or programs at church were less likely to smoke even...

Warning Signs Of Pregnancy Danger

Warnings signs such as increased stress could indicate that pregnancy-induced hypertension is reaching life-threatening levels. The condition is variable and can change quickly. A higher number of symptoms, such as headaches and dizziness, could also mean the condition is getting worse. Also known as preeclampsia and gestational hypertension, pregnancy-induced hypertension occurs at about 20 weeks...

Drug-sensitive 'Traffic Cop' Tells Potassium Channels To Get Lost

Our brains are buzzing with electrical activity created by sodium and potassium ions moving in and out of neurons through specialized pores. To prevent the constant chatter from descending into chaos the activity of these ion channels has to be tightly regulated. One possibility is to issue the channels a ticket straight to the cellular dumpster, discovered researchers.

Genome Study Shines Light On Genetic Link To Height

Using a new "genome-scanning" method, a team of scientists has identified the first robust link between genes and stature in humans. A single letter change in a gene called HMGA2 enables people who carry it to gain as much as a centimeter in height. The work provides insights into how genes hardwire growth in humans and suggests that finding additional height-related genes may be feasible.

Lettuce, Leafy Greens And E. Coli

The rise in year-round consumption of fresh leafy greens such as lettuce and baby spinach is increasing the difficulty of keeping produce free from contamination by food poisoning bacteria, according to scientists.

Low-cost Recipe For Patterning Microchips Developed

Creating ultrasmall grooves on microchips -- a key part of many modern technologies -- is about to become as easy as making a sandwich, using a new process invented by Princeton engineers. The simple, low-cost technique results in the self-formation of periodic lines, or gratings, separated by as few as 60 nanometers -- less than one ten-thousandth of a millimeter -- on microchips.

New Viruses To Treat Bacterial Diseases: 'My Enemies' Enemy Is My Friend'

Viruses found in the River Cam in Cambridge, famous as a haunt of students in their punts on long, lazy summer days, could become the next generation of antibiotics, according to scientists. With antibiotics now over-prescribed for treatments of bacterial infections, and patients failing to complete their courses of treatment properly, many bacteria are able to pick up an entire array of...

Regulator Of Lipid Metabolism Ensures High Quality Breast Milk

Mouse mammary glands deficient in PPAR³, a nuclear receptor that regulates the storage of fat, produce toxic milk that causes inflammation and baldness in suckling pups, report scientists at the Salk Institute for Biological Studies. "We were quite surprised by the unexpected quality control mechanism that ensures the quality of breast milk," says Ronald M. Evans, Ph.D., professor in the Salk...


SATURDAY 1. SEPTEMBER 2007


Baiji Dolphin Previously Thought Extinct Spotted In The Yangtze River

The reported sighting of a Yangtze River dolphin, or Baiji, means there is still a chance for people to take further action and protect the cetaceans in the Yangtze from extinction, according to World Wildlife Fund. Based on the river's geographic and hydrological complexity and the official definition of extinction by IUCN, WWF and many scientists agreed that this species was "functionally...