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New Carnivorous Plant Discovered In Pacific Northwest

著者: BeauHD
2021年8月10日 19:00
A pretty little white flower that grows near urban centers of the Pacific Northwest turns out to be a killer. NPR reports: The bog-dwelling western false asphodel, Triantha occidentalis, was first described in the scientific literature in 1879. But until now, no one realized that this sweet looking plant used its sticky stem to catch and digest insects, according to researchers who note in their study published Monday that it's the first new carnivorous plant to be discovered in about 20 years. "We had no idea it was carnivorous," says Sean Graham, a botanist with the University of British Columbia. "This was not found in some exotic tropical location, but really right on our doorstep in Vancouver. You could literally walk out from Vancouver to this field site." Fewer than a thousand plant species are carnivorous, and these plants tend to live in places with abundant sun and water, but nutrient-poor soil. Graham's team was doing an unrelated project on plant genetics and noticed that the western false asphodel had a genetic deletion that's sometimes seen in carnivorous plants. The researchers started to think about the fact that this flower grew in the kind of environment that's home to various other insect-eating plants. "And then they have these sticky stems," says Graham. "So, you know, it was kind of like, hmm, I wonder if this could be a sign that this might be carnivorous." To see if the plants could actually take in nutrients from insects, researcher Qianshi Lin, now at the University of Toronto, Mississauga, fed fruit flies nitrogen-15 isotopes, so that this nitrogen could be used as a tracker. He then stuck these flies to stems of this plant. Later, an analysis showed that nitrogen from the dead insects was indeed getting into the plants. In fact, Triantha was getting more than half of its nitrogen from prey. In the Proceedings of the National Academy of Sciences published online Monday, Lin and his colleagues say that this is comparable to what's seen in other carnivorous plants. What's more, the researchers showed that the sticky hairs on the flower stalk produce a digestive enzyme that's known to be used by many carnivorous plants. And when the research team looked at specimens of this plant preserved in herbariums, they found small dead insects stuck to the stems.

Read more of this story at Slashdot.

World's Strongest Glass That's As Hard As Diamond Discovered

著者: BeauHD
2021年8月10日 11:20
Hmmmmmm shares a report from The Independent: Scientists in China have developed the hardest and strongest glassy material known so far that can scratch diamond crystals with ease. The researchers, including those from Yanshan University in China, noted that the new material -- tentatively named AM-III -- has "outstanding" mechanical and electronic properties, and could find applications in solar cells due to its "ultra-high" strength and wear resistance. Analysis of the material, published in the journal National Science Review, revealed that its hardness reached 113 gigapascals (GPa) while natural diamond stone usually scores 50 to 70 on the same test. According to the scientists, AM-III has tunable energy absorption properties comparable to semiconductors commonly used in solar cells such as hydrogenated amorphous silicon films. While in diamond crystals, the organized internal structure of its atoms and molecules contribute to their immense strength and hardness, in AM-III the researchers found that a combination of order and disorder of its molecules give rise to its strange properties. Using fullerenes, which are materials made of hollow football-like arrangements of carbon atoms, the researchers produced different types of glassy materials with varying molecular organization among which AM-III had the highest order of atoms and molecules. Increasing the order further, the scientists observed, could potentially kill the semiconductivity and other properties that required the atoms and molecules to be chaotic.

Read more of this story at Slashdot.

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