The maximum daily level for magnesium in food supplements should not exceed 250 milligrams (mg). This is the recommendation of the German Federal Institute for Risk Assessment (BfR), taking into account new data.
A paper reviews recent progress on turbulent broadening of cloud droplet size distributions and warm rain initiation.
In the embryonic kidney, three types of precursor cells interact with each other to form a three-dimensional structure. Previous studies successfully induced nephron structures via nephron progenitors from mouse and human pluripotent stem cells (PSCs) but have not yet reproduced the well-organized structures of the kidney. Now, a Japanese research group has developed a method to induce another important progenitor from PSCs and assembled them together thereby succeeding in reproducing higher-order kidney structures.
Recognizing that many large dams are here to stay, a University of Washington team is investigating an emerging solution to help achieve freshwater conservation goals by re-envisioning the ways in which water is released by dams.
Researchers from the Canadian Museum of Nature and the Natural History Museum of Los Angeles County have identified remains of a 3.5-million-year-old bear from a fossil-rich site in Canada's High Arctic. Their study shows not only that the animal is a close relative of the ancestor of modern bears -- tracing its ancestry to extinct bears of similar age from East Asia -- but that it also had a sweet tooth, as determined by cavities in the teeth.
Scientists from the Florida campus of The Scripps Research Institute (TSRI) have now uncovered new insights into the regulatory network behind neuron growth.
Antimicrobial compounds added to preserve food during storage are believed to be benign and non-toxic to the consumer, but there is 'a critical scientific gap in understanding the potential interactions' they may have with the hundreds of species of microbes in our intestines, say David Sela, a nutritional microbiologist at the University of Massachusetts Amherst, and colleagues.
Researchers at The Ottawa Hospital and the University of Ottawa have discovered that the Maraba virus, or MG1, can target and destroy the kind of HIV-infected cells that standard antiretroviral therapies can't reach. This laboratory discovery was published in the Journal of Infectious Diseases. If this technique works in humans, it might possibly contribute to a cure for HIV.
A new paper published in Behavioral Ecology finds that songbirds may coordinate both vocally and visually to enhance their singing partners' responses.
Today our world is visually dominated by animals and plants, but this world would not have been possible without fungi, say University of Leeds scientists.