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Comment fonctionne notre forum => Accueil => Discussion démarrée par: MethrenRaf le Janvier 05, 2025, 08:23:33 pm
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Marine fog appears to be responsible for elevated levels of mercury in coastal terrestrial food webs, and its trickling all the way to the top, according to new research published this week in Scientific Reports. Pumas living in the fog belt of the Santa Cruz Mountains have three times the amo stanley becher (https://www.stanleycups.at) unt of mercury in their systems compared to their cohorts living outside of the fog zone. Its yet another threat to a species already at risk. Environmental toxicologist Peter Weiss-Penzias from UC Santa Cruz led the new research, and its the first time scientists have tracked the neurotoxin from its presence in the air through to its presence in an apex predator. Delivered by marine fog, the mercury first contaminates plants, namely lich stanley cup (https://www.cup-stanley.us) en. These plants are then eaten by herbivores such as deer, who are in turn consumed by mountain lions. Its the circle of life, but with a dash of despair in the form of methylmercury鈥攁 particularly toxic water-soluble stanley cup (https://www.stanley-mugs.us) form of the chemical element. Lichen dont have any roots so the presence of elevated methylmercury in lichen must come from the atmosphere, said Weiss-Penzias in a UC Santa Cruz press release. Mercury becomes increasingly concentrated in organisms higher up the food chain. Indeed, by the time its at the level of the mountain lions, the methylmercury concentrations have increased by as much as 1,000 times, according to the study. Infographic showing how mercury makes its way into the terrestrial food web. Image: UC Santa Cruz Mer Xahh Giphy s New Video Platform Pounds Another Nail In the Coffin of the GIF
Things stick together thanks to a combination of various microscopic and macroscopic behaviors, influenced by interactions b stanley cup (https://www.cup-stanley.com.de) etween individual molecules and the shapes of surfaces. The complexity makes it difficult to create something that is聽both very sticky and reusable, a fact thats especially true of glues. This new sticky stuff might overcome these limitations. The team of researchers from Lehigh University and the University of Pennsylvania studied a hydrogel called poly 2-hydroxyethyl methacrylate or PHEMA. Hydrogels are absorbent polymers that dont dissolve. In the presence of water, PHEMA becomes soft and conforms to the microscopic nooks and crannies of a surface. As it dries stanley cup (https://www.stanley-cups.it) , it hardens. Add water, and it once again becomes soft and detaches. https://gizmodo/scientists-are-stuck-on-the-mystery-of-tape-1835074649 The researchers performed several tests on the adhesive in order to measure the force required to pull the PHEMA off of both smooth and rough surfaces. PHEMA could withstand forces seven times higher than the limit of the strongest Velcro, according to the paper published in the Proceedings of the National Academy of Sciences. They also compared the gel to a variety of o stanley cup (https://www.stanley-cups.us) ther adhesives, and PHEMA seemed to perform best. A dab of the adhesive could suspend a whole human, according to a Penn Engineering blog post. Its not the strongest adhesive around, but it might be the strongest reversible adhesive. As is the case with many adhesives, the biological wor