Cov tshuaj tiv thaiv tshiab tuaj yeem pab piav qhia keeb kwm ntawm lub neej los ntawm cov tsis muaj sia nyob

"Lub hauv paus ntawm lub neej" yog ib qho kev kawm uas cov kws tshawb fawb tau nqis peev ntau lub sijhawm thiab cov peev txheej los nkag siab nws zoo dua. Yuav ua li cas lub neej tshwm sim los ntawm cov tsis muaj nyob molecules tseem yog ib tug ntau-debated lub ntsiab lus. Tab sis tam sim no, cov kws tshawb fawb ntawm Scripps Research tej zaum yuav pom ib yam dab tsi los teeb pom kev ntawm qhov kev kawm. Cov kws tshawb fawb tau tshawb pom cov txheej txheem tshuaj lom neeg uas tuaj yeem tsim cov amino acids thiab nucleic acids - lub tsev thaiv cov proteins thiab DNA - los ntawm kev siv cyanide, ammonia, thiab carbon dioxide.

Dab tsi ua rau qhov kev tshawb pom tseem ceeb? Cov tebchaw uas muaj nyob rau hauv cov tshuaj tiv thaiv uas tuaj yeem tsim lub tsev thaiv cov proteins kuj yog cov khoom uas tau xav tias muaj nyob rau hauv lub ntiaj teb thaum ntxov, txoj kev tshawb no luam tawm nyob rau hauv phau ntawv journal Xwm Kaus Lim piav qhia.

Ramanarayanan Krishnamurthy, tus thawj coj ntawm cov ntawv luam tawm thaum Lub Xya Hli 28, tau hais txog qhov kev tshawb pom, "Peb tau los nrog lub tswv yim tshiab los piav qhia qhov no. shift los ntawm prebiotic mus rau biotic chemistry. " Krishnamurthy, uas yog tus kws tshaj lij ntawm chemistry ntawm Scripps Kev Tshawb Fawb, ntxiv, "Peb xav tias hom kev tshwm sim uas peb tau piav qhia yog tej zaum yuav tshwm sim hauv ntiaj teb thaum ntxov."

Qhov kev tshawb pom tsuas yog lub hlis tom qab Krishnamurthy pawg tsom yuav ua li cas cyanide tuaj yeem pab cov tshuaj tiv thaiv uas hloov dej thiab prebiotic molecules rau hauv cov organic tebchaw uas yuav tsum tau los txhawb lub neej. Qhov kev sim tau ua tiav thiab ib qho uas ua haujlwm thoob plaws pH ntau yam ntawm chav tsev kub. Ua raws li qhov kev txhim kho no, cov kws tshawb fawb xav paub yog tias tib yam xwm txheej tseem yuav tso cai rau tiam ntawm cov amino acids, uas yog cov molecules nyuaj dua uas "suav cov proteins hauv txhua lub hlwb uas paub," kev tshawb fawb. piav qhia.

Tom qab cyanide, pab pawg zeroed nyob rau hauv nitrogen, uas yog ib qho tseem ceeb compound nyob rau hauv cov tshuaj tiv thaiv. Yog li, lawv ntxiv ammonia, ib daim ntawv ntawm nitrogen tam sim no nyob rau hauv lub ntiaj teb thaum ntxov. Tom qab kev sim thiab ua yuam kev, lawv pom cov pa roj carbon dioxide los ua cov khoom xyaw thib peb ntawm cov khoom sib xyaw uas tuaj yeem tsim cov amino acids.

"Yog tias koj tsuas yog sib xyaw keto acid, cyanide thiab ammonia, nws tsuas yog zaum ntawd. Raws li soon Raws li koj ntxiv cov pa roj carbon dioxide, txawm tias muaj pes tsawg, cov tshuaj tiv thaiv nce nrawm, "Krishnamurthy tau hais. "Peb cia siab tias nws yuav nyuaj heev los txiav txim siab qhov no, thiab nws tau dhau los ua qhov yooj yim dua li peb tau xav."

Raws li cov kauj ruam tom ntej, pab neeg no yuav tsom mus rau "Yuav ua li cas chemistry tuaj yeem tshwm sim los ntawm qhov sib tov" thiab seb cov amino acids puas tuaj yeem pib tsim cov proteins me.