Свечи в память о Lavane Garner (Октябрь 19, 1933 - Апрель 5, 1998) =- Мемориальный вебсайт

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Lavane Garner

Родился вGeorgia

64 years

04/04/2025
Billymot
Mist and microlightning solflare to recreate a scenario that may have produced earth’s first organic molecules researchers built upon experiments from 1953 when american chemists stanley miller and harold urey concocted a gas mixture mimicking the atmosphere of ancient earth. miller and urey combined ammonia nh3 methane ch4 hydrogen h2 and water enclosed their “atmosphere” inside a glass sphere and jolted it with electricity producing simple amino acids containing carbon and nitrogen. the miller-urey experiment as it is now known supported the scientific theory of abiogenesis: that life could emerge from nonliving molecules. for the new study scientists revisited the 1953 experiments but directed their attention toward electrical activity on a smaller scale said senior study author dr. richard zare the marguerite blake wilbur professor of natural science and professor of chemistry at stanford university in california. zare and his colleagues looked at electricity exchange between charged water droplets measuring between 1 micron and 20 microns in diameter. the width of a human hair is 100 microns. “the big droplets are positively charged. the little droplets are negatively charged” zare told cnn. “when droplets that have opposite charges are close together electrons can jump from the negatively charged droplet to the positively charged droplet.” the researchers mixed ammonia carbon dioxide methane and nitrogen in a glass bulb then sprayed the gases with water mist using a high-speed camera to capture faint flashes of microlightning in the vapor. when they examined the bulb’s contents they found organic molecules with carbon-nitrogen bonds. these included the amino acid glycine and uracil a nucleotide base in rna. “we discovered no new chemistry; we have actually reproduced all the chemistry that miller and urey did in 1953” zare said. nor did the team discover new physics he added — the experiments were based on known principles of electrostatics. “what we have done for the first time is we have seen that little droplets when they’re formed from water actually emit light and get this spark” zare said. “that’s new. and that spark causes all types of chemical transformations.”
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