They say they are unable to replicate key laboratory experiments backing the drugs' promise.
The team also did some laboratory experiments, which showed that HIV binds to the receptor.
It's a surprisingly strong tendency, one that has been observed in countless laboratory experiments and real-world examples of behavior.
The Cornell team now plans to do some laboratory experiments to see whether species richness does encourage chytrid to spread.
Across the road is Amyris, a Californian company which has developed enzymes that in laboratory experiments have turned sugar into substitutes for motor and jet fuel.
Studies on people have left more questions than answers, and laboratory experiments have failed to pin down a plausible mechanism whereby weak magnetic fields could trigger the disease.
As the Nobel-winning economist Vernon Smith (now of Chapman University) and colleagues found in laboratory experiments, markets in goods for consumption promote cooperation, but markets in assets for speculation and resale produce bubbles and crashes.
Pesticides and other chemicals that could mimic estrogen and disrupt the normal development of salmon are present in the Columbia's water, Nagler said, but at very low concentrations - far below those used in laboratory experiments.
Flavonoids and flu: Two plant-based flavonoids disease-fighting compounds found in many foods significantly impaired the infectious activity of H5N1 avian-flu virus in laboratory experiments and may form the basis of future influenza treatments, a report in Antiviral Research says.
So far, laboratory experiments meant to measure how plants will respond to warmer temperatures in the future haven't worked well, and computer models to forecast regional climate effects have fared no better, NASA and university researchers recently concluded.
The Center for the Study of Carbon Dioxide and Global Change, which maintains a database on field and laboratory experiments measuring plant growth responses to CO2-enriched environments has reported 45 studies that have examined effects on the garden tomato (lycopersicon eculentum).
Extrapolating from Dr Freund's laboratory experiments, the strain in a real-life geological fault such as the San Andreas could, as it shifted, generate hundreds of thousands of amperes per cubic kilometre in a fluctuating pattern that would cause very low frequency radio waves to be emitted, thus disrupting the ionosphere.
Another series of laboratory-based experiments, carried out at Newcastle University, examined the behaviour of the bees.
In experiments on laboratory rats, which are programmed to develop fatal necrotizing enterocolitis, injections of stem cells appeared to increase survival times.
In experiments performed at Los Alamos National Laboratory, when humans were asked to perform object recognition tasks, the experiments were kept under an hour so as not to get to the point where the subjects could no longer focus on the task.
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After 20 laboratory tests and 16 field experiments, it was determined that the simulator has an average rain uniformity of 90% and rain intensity of 124 mm h-1.
Gary Thorgaard, director of Washington State University's School of Biological Sciences and a co-author of the paper, says the experiments in his laboratory and others have shown it is possible to reverse the sex of trout embryos through the use of hormones.
If the signature of an element is found at a wavelength that is slightly to the blue side of what experiments in a laboratory show, this means the star is moving towards the earth, making the wavelength of the light it was emitting slightly shorter.
For at least one of the major experiments at the CERN laboratory, in Switzerland, that's down to the new person in charge, Professor David Charlton from the University of Birmingham.
During the eight days and 22 hours the mission is scheduled to run--eight days and 17 hours more than Glenn got last time--the astronauts will be kept busy releasing and retrieving a sun-sensing satellite, testing components for the Hubble Space Telescope, and conducting experiments in an onboard laboratory.
Many of these fears are based on results from limited experiments, often in the laboratory.
Acrylamide came to the attention of scientists after experiments on cells in the laboratory, and on animals suggested it could be harmful.
Each can be carried out by children of all ages in schools around the world and no special equipment is needed (all experiments can be done with laboratory equipment at schools).
Masicampo and Roy Baumeister of Florida State University discovered this by doing some experiments on that most popular of laboratory animals, the impoverished undergraduate.
More than 600 experiments conducted in orbit aboard this amazing laboratory have contributed to important research designed to improve the quality of life for everyone.
The first, scheduled for Saturday, will add a platform to the Japanese laboratory complex, Kibo, which can be used for experiments that require materials to be exposed to the harsh environment of space.
In early experiments, Bhatia's lab, called the Laboratory for Multiscale Regenerative Technology, was able to infect her liver cells with malaria for the first time two weeks ago and hopes to be able to offer malaria researchers a way to test drugs that will kill the hypnozoites.
Thanks to its commitment to renewable energy, Hawaii is now also becoming something of a test bed for renewable energy technologies, from the study of various geothermal and algae-based biofuel technologies happening at the Natural Energy Laboratory of Hawaii Authority on the Big Island to smart grid experiments the state is conducting along with representatives from Japan and China.
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It was shut down on Sunday 31 March and will be dismantled this month after some experiments are carried out on its operating system, said the laboratory.
With the TED Prize money, Mitra intends to build a laboratory, most likely in India, where he can test his theories through experiments that supplement schoolwork.
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