His findings, published online in Applied and Environmental Biology, shattered a myth started by a 2010 article in the journal Science, claiming the Trogia venenata mushroom contained high concentrations of the metal barium, causing high blood pressure, cardiac arrests and sudden deaths in southwestern China over the past 30 years. The deaths mainly occurred in small villages, some of which saw nearly one-third of their population perish quickly.
Trogia venenata mushroom
“Although there was no published evidence supporting the theory that barium in the T. venenata mushroom was the leading culprit of what was called Sudden Unexplained Death (SUD), it was picked up as a fact by almost all of the major news media,” said Xu, associate professor of biology and a member of the Michael G. DeGroote Institute for Infectious Disease Research at McMaster University. “These reports caused significant concern among the public about potentially high levels of barium in wild edible mushrooms in southwest China.”
Every summer since 2009, Xu and his team have travelled across the Yunnan province, collecting fruiting bodies of T. venenata as well as other mushrooms from villages severely impacted by these deaths.
Researchers tested the mushrooms and found the barium concentration was so low it would require a person weighing 150 pounds to consume at least 35 kg of dried T. venenata for it to be lethal. In fact, the barium concentration in these mushrooms is the same as in common foods, such as fresh meat and poultry.
The majority of SUDs, since 1978 in Yunnan Province, occurred in apparently healthy people, mostly young females, during the rainy season from June to August.
While previous studies suggested certain mushrooms could accumulate heavy metals, there was no information about high levels of barium in wild edible mushrooms. The speculation and subsequent media reports generated significant concern among health officials, the general public and all levels of government and severely impacted the economy by affecting trade of many wild, edible Chinese mushrooms, such as Matsutake, truffles, morels and Chanterelles.
Although Xu’s results show these mushrooms contain low levels of barium, he says barium can’t be ruled out as a contributor to the deaths, given that high levels of barium were found in the blood, urine and hair samples of some of the victims. Yet, his study does suggest that barium in mushrooms was unlikely the leading cause. “Though there are a couple of leads,” he said, “further investigation is needed to discover what the true cause was for these mysterious deaths.”Read Jianping Xu’s study online: http://bit.ly/TR9lVl
Veronica McGuire | Newswise
New study: How does Europe become a leading player for software and IT services?
03.04.2017 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
Reusable carbon nanotubes could be the water filter of the future, says RIT study
30.03.2017 | Rochester Institute of Technology
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
24.04.2017 | Physics and Astronomy
24.04.2017 | Materials Sciences
24.04.2017 | Life Sciences