17. novembril avaldatud uuringus andsid teadlased teada, et nad on leidnud keemilisi j\u00e4lgi elust enam kui 3,3 miljardi aasta vanustes kivimites, mis nihutab elu alguse ajajoont Maal varasemaks, kui seni arvati. Vahe senisega on umbes 1,6 miljardit aastat. Uurimisr\u00fchm, mida juhtis Carnegie teadusinstituut USA-s, kasutas uudset meetodit, mis \u00fchendab k\u00f5rgresolutsioonilise keemilise anal\u00fc\u00fcsi ja tehisintellekti. Kuna vanades kivimites on algsed biomolekulid sageli h\u00e4vinud, \u00f5petati masin\u00f5ppe mudelit tuvastama ka k\u00f5ige n\u00f5rgemaid molekulaarseid j\u00e4lgi, mis viitavad kunagisele elule.<\/p>\n
Anal\u00fc\u00fcsiti enam kui 400 erinevat proovi, sh taimi, fossiile ja meteoriite. Tehisintellekt suutis eristada bioloogilise p\u00e4ritoluga aineid \u00fcle 90% t\u00e4psusega. See l\u00e4henemine v\u00f5imaldas tuvastada ka esimesed m\u00e4rgid hapnikku tootvast fotos\u00fcnteesist v\u00e4hemalt 2,5 miljardi aasta vanustes kivimites. Avastus mitte ainult ei pikenda Maal tuntud elu keemilist ajalugu, vaid avab ka uusi v\u00f5imalusi elu tegevusest j\u00e4\u00e4nud j\u00e4lgede otsimiseks teistel planeetidel.<\/p>\n
Artikkel ilmus ajakirjas Proceedings of the National Academy of Sciences ja seda saab lugeda SIIN<\/a>.<\/p>\n Kuidas see lugu Sind end tundma pani?
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