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135,929 articles from ScienceDaily

Climatic Variations Influence The Emergence Of Cholera In Africa

In studies aiming to understand better the emergence and persistence of cholera in Africa, researchers showed the strong correlation that exists between outbreaks and the different parameters linked to climate changes in West Africa. This research should provide the scientists with the basis for creating a predictive model which could improve early warning of risks by anticipating the emergence of...

Coral Reef Fish Harbor An Unexpectedly High Biodiversity Of Parasites

A grouper fish found off New Caledonia was found to be parasitized by 12 species of microscopic monogenean worms. This diversity of parasites has just been confirmed also in the malabar grouper, another the coral reef species. If such a level of parasite diversity prevails in all coral-reef fish, tens of thousands of parasite species are in this ecosystem waiting to be discovered.

Crossing The Line Between Tired And Fatigued

Jennifer Sieck knew something had to be done when she would lie in bed most of the day and night. "It would be a big deal and everyone would get excited if I'd come down to the living room and could sit there for 10 or 20 minutes," the 38 year old says. Sieck was more than just drowsy; she was fatigued, and no amount of sleep could shake her exhaustion. "It's not about being tired, it's about...

Curbing C. Difficile's Toxin Production

Researchers have discovered how the protein CodY controls toxin production of Clostridium difficile, a bacterium that has caused epidemics of severe diarrhea in hospital patients. In its search for food, C. difficile releases toxins that cause diarrhea and in rare cases death. Gaining a better understanding of how CodY prevents C. difficile from making toxins may lead to future drug development...

Doctor's Gender May Hinder Early Diagnosis Of Heart Disease In Women

A doctor's gender may hinder early hinder early diagnosis of heart disease in women. Twice as many women as men aged 45-64 have undetected or "silent" myocardial infarctions, suggesting a general diagnosis problem. Despite the fact that all the patients gave case histories that should have resulted in a clear diagnosis of coronary heart disease, the results showed that doctors were significantly...

Engineers Rescue Aging Satellites, Saving Millions

Researchers have used a new technique to save $60 million for broadcasters by extending the service life of two communications satellites. The technique works by applying an advanced simulation and a method that equalizes the amount of propellant in a series of fuel tanks so that the satellite consumes all of the fuel before being retired from service.

Environmental Stress Probed In Cardiovascular Disease, Diabetes

How environmental stress contributes to cardiovascular disease and type 2 diabetes is under study. Researchers have long thought that environmental stress factors -- things like family dysfunction, low socioeconomic status and discrimination -- play an important role in cardiovascular disease and type II diabetes, but little is known about physiological factors that link stress to the diseases'...

High Rate Of Asthma Found In College Athletes

More than a third of college athletes assessed for breathing problems had test results suggesting exercise-induced asthma, even in those athletes who had no previous history of asthma, a new study shows. The findings paralleled earlier findings of a high prevalence of exercise-induced asthma among Olympic athletes. The work also underscores the need to develop more routine diagnosis and management...

How Insulin Secreting Cells Maintain Their Glucose Sensitivity

Scientists have now disclosed the mystery how the insulin-secreting cells maintain an appropriate number of ATP sensing ion channel proteins on their surface. This mechanism explains how the human body can keep the blood glucose concentration within the normal range and thereby avoid the development of diabetes.

Invasive Fish - Round Gobie - Spreading Swiftly Through Great Lakes

Ever since fishery biologists discovered non-native round gobies in the Great Lakes in 1990, scientists have been trying to figure out exactly how the unwanted intruders got there, and how they quickly spread to all five lakes. Now new information on the behavior of the fish present a new possibility. At night during the summer breeding season, countless newly hatched round gobies leave their...

Migrating Squid Drove Evolution Of Sonar In Whales And Dolphins, Researchers Argue

Sperm whales, dolphins and other "toothed" whales hunt squid so deep in the ocean they must rely on biosonar. Paleontologists argue for a likely evolutionary scenario that explains how these whales developed echolocation. What initially was a rudimentary echolocating ability to find hard-bodied nautiloids in surface waters 40 million years ago was perfected, as nautiloids declined, into a refined...

Networks Create 'Instant World Telescope'

For the first time, a CSIRO radio telescope has been linked to others in China and Europe in real-time, demonstrating the power of high-speed global networks and effectively creating a telescope almost as big as the Earth.

Neural Stem Cell Study Reveals Mechanism That May Play Role In Cancer

In the dynamic world of the developing brain, neural stem cells give rise to neurons deep within the brain's fluid-filled ventricles. These newborn neurons then migrate along the stem cell fibers up to the neocortex, the seat of higher cognitive functions. Now, scientists have discovered a key mechanism of this migration -- one that may also play an important role in other developmental processes...

New CPR Promises Better Results By Compressing Abdomen, Not Chest

A biomedical engineer at Purdue University has developed a new method to perform cardiopulmonary resuscitation that promises to be more effective than standard CPR because it increases nourishing blood flow through the heart by 25 percent over the current method. A new technique is desperately needed because conventional CPR has a success rate of 5 percent to 10 percent, depending on how fast...

New Species May Form WIth A Little Help From Immune System

Scientists discover how the immune system can drive the formation of new species. Plant geneticists and animal breeders alike know the problem: single individuals or entire broods will not thrive, some die early, or remain, even if they survive, the runts of the litter and thus not useful for continued breeding programs. What is annoying for the breeder, fascinates geneticists and molecular...