Echinacea is not effective in shortening the duration or decreasing the severity of upper respiratory tract infections in children, according to a study in the December 3 issue of The Journal of the American Medical Association (JAMA).
Upper respiratory tract infections (URIs) are a significant health burden in childhood, according to background information in the article. The average child has six to eight colds each year, each lasting seven to nine days. While children are frequently given drugs such as decongestants, antihistamines, and cough suppressants to reduce symptoms, there is little evidence that these medications are effective in children younger than 12 years. The authors add that it has been estimated that 11 percent to 21 percent of children in the United States and Canada who are receiving care from conventional physicians are also using alternative therapies. Echinacea, one of the most commonly used herbal remedies in the U.S., has been used extensively for the prevention and treatment of URIs in adults.
James A. Taylor, M.D., from the University of Washington, Seattle, and colleagues, conducted a randomized controlled trial to determine the effectiveness and safety of Echinacea purpurea (a type of echinacea used for medicinal purposes) in treating URIs in children two to 11 years old. A total of 524 children were included in the study. The patients were randomized to receive either echinacea or placebo for up to three URIs over a four-month period. The echinacea or placebo was started at the onset of symptoms and continued for a maximum of ten days.
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Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
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For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
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An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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