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144,192 articles from ScienceDaily

PCBs May Threaten Killer Whale Populations For 30-60 Years

Orcas or killer whales may continue to suffer the effects of contamination with polychlorinated biphenyls (PCBs) for the next 30 to 60 years, despite 1970s-era regulations that have reduced overall PCB concentrations in the environment, researchers report. Other threats to orca survival include ship traffic, reduced abundance of prey and environmental contamination. Orcas, which reach a length...

Genetic Background To Severe Urinary Tract Infections

If you sit on cold boulders or forget to wear your woollen pants, you can develop a urinary tract infection, or so the story goes. It turns out though, that these diseases are more complicated than this, and in some cases they have a genetic background. Scientists have found a gene that appears to lie behind many of the most severe urinary tract infections.

Improved E-jet Printing Provides Higher Resolution And More Versatility

By combining electrically induced fluid flow with nanoscale nozzles, researchers have established new benchmarks for precision control and resolution in jet-printing processes. This type of e-jet printing could be used for large-area circuits, displays, photovoltaic modules and related devices, as well as other wide-ranging application possibilities in security, biotechnology and photonics,...

Measuring Depression

It's hardly surprising that clinically depressed people act differently than healthy people. Quantifying the difference, however, can be difficult. Now a collaboration of physicists and psychiatrists in Japan has found a way to clearly and objectively measure depression. The researchers outfitted both healthy control subjects and depressed patients with accelerometers to continuously measure their...

What Is Dark Energy? 'Beyond Einstein' Program Aims To Investigate

NASA and the US Department of Energy should pursue the Joint Dark Energy Mission as the first mission in the "Beyond Einstein" program, according to a new report from the National Research Council. Beyond Einstein is NASA's research roadmap for five proposed mission areas to study the most compelling questions at the intersection of physics and astronomy.

Ethnic Minorities Do Stick With Clinical Research

A significant number of people from ethnic minority backgrounds can be persuaded to take part in research studies, according to a new report. This contradicts previous research that suggests that ethnic minorities are less likely to volunteer for clinical research, possibly due to famous breaches of medical ethics, such as the Tuskegee Syphilis Study.

Food Additives Linked To Hyperactivity In Children, Study Shows

A major study has shown evidence of increased levels of hyperactivity in young children consuming mixtures of some artificial food colors and the preservative sodium benzoate. The possibility of food colours and preservatives affecting children's behaviour has long been an unresolved question for parents. This significant new research provides a clear demonstration that changes in behaviour can be...

How One Storm Can Affect Another

Weather forecasting and climate modeling for the notoriously unpredictable Sahel region of Africa could be made easier in the future, thanks to new research results coming from the African Monsoon Multidisciplinary Analysis study. The scientists gathered new atmospheric data by using satellite imagery to plot flight paths over areas where storms had produced very wet soils. Dropsondes (weather...

Safer Car Controls

The number of electronic components in cars is growing rapidly. To ensure that vehicle electronics will work properly in future despite the overabundance of software and its increasing complexity, researchers are remodeling it and making it even safer. The sight of a shiny new car suggests streamlined high-tech devices. But appearances are deceptive. Under the hood, all is confusion. Around 100...

Marine Team Finds Surprising Evidence Supporting A Great Biblical Flood

Did the great flood of Noah's generation really occur thousands of years ago? Was the Roman city of Caesarea destroyed by an ancient tsunami? Will pollution levels in our deep seas remain forever a mystery? These are just a few of the questions that are being addressed by a new environmental marine research team. Scientists and Swedish environmental philanthropist Andreas Weil are collaborating on...

Non-stick Molds

Aircraft wings and dashboards are shaped in metal molds. These have to be 'greased', just like cake tins, before each molding process so that the plastic parts can be extracted at the end. A permanent coating has been designed to provide help in future. Baking a cake without greasing the tin is usually a disaster: The cake cannot be taken out in one piece. The same principle applies to the...

Teen Binge Drinkers Risk Alcoholism And Social Exclusion As Adults

Teen binge drinkers are significantly more likely to become heavy drinkers as adults and find themselves with a string of criminal convictions, indicates a new study. The researchers monitored the health and prospects of more than 11,000 UK children born in 1970 at the ages of 16 and 30. They collected information on binge drinking during the preceding fortnight and habitual drinking during the...

Device To Predict Proper Light Exposure For Human Health

Scientists have long known that the human body runs like clockwork, guided by a circadian system that responds to daily patterns of light and darkness. Now a team of researchers is developing a personal device to measure daily light intake and activity, which could allow them to predict optimal timing for light therapy to synchronize the circadian clock to the 24-hour solar day and relieve...

New Cause Of Blindness Discovered

Scientists found evidence for blindness associated with a gene involved in retinal pH regulation. Their characterization of a mouse model with a targeted disruption of the Slc4a3 gene has revealed a new cause of blindness.

Ancient Escape Tunnel Discovered In Israel

In excavations in the City of David aimed at exposing the main road in Jerusalem from the time of the Second Temple period, the city's main drainage channel was discovered. According to the writings of Josephus Flavius, the residents of the city fled to this channel at the time of the revolt in order to hide from the Romans.

Chemotherapy May Be Culprit For Fatigue In Breast Cancer Survivors

Compared to healthy women, breast cancer survivors reported more days of fatigue and more severe fatigue symptoms. Fatigue is a common complaint in the general population and, anecdotally, common among cancer patients. Comparative fatigue studies between the two populations, however, have been marred by methodological shortcomings, such as poorly matched controls and patient populations.


SUNDAY 9. SEPTEMBER 2007


Bacteria Successful In Cancer Treatment

Bacteria that thrive in oxygen starved environments have been used successfully to target cancer tumours, delivering gene therapy based anti-cancer treatments. For about half of cancer sufferers our traditional treatments such as radiotherapy and chemotherapy are ineffective, so alternative techniques are being developed to target their tumours.

Which Incentives to Prevent Flu Epidemics Would Be Effective?

Recent findings from study of incentives, decision-making, and influenza epidemics may offer guidance on public health policy. Researchers have found that while family-based vaccination incentives fail to prevent severe epidemics, program that allows individuals three free annual vaccinations once they pay for the first may prove effective.

Ecologists Get To The Bottom Of Why Bears Rub Trees

Ecologists have at last got to the bottom of why bears rub trees -- and it's not because they have itchy backs. Adult male grizzly bears use so-called "rub trees" as a way to communicate with each other while looking for breeding females, and that this behaviour could help reduce battles between the bears.