The X-ray emission of the young Sun was much harder and intense than today and might have played a significant role in the evolution of complex organics in protoplanetary environments. We investigate the effects of soft X-rays on tryptophan molecules in aqueous solutions at room temperature. As results of the irradiation experiments we detect several light species indicative of fragmentation, together with large molecular structures such as tryptophan dipeptide and tripeptide. Complexification is more evident in H2O solution than in D2O, probably due to isotopic effects. The abundances of peptides depend on the irradiation dose and decrease with increasing energy deposition. Radicals such as D, OD, H and OH, induced by the X-ray interaction with solvents, play a major role in determining the final products.
CIARAVELLA ANGELA, SCAPPINI FLAVIO, FRANCHI MARCO, CECCHI-PESTELLINI CESARE, BARBERA M, CANDIA ROBERTO, et al. (2004). Role of clays in protecting adsorbed DNA against X-ray radiation. INTERNATIONAL JOURNAL OF ASTROBIOLOGY, 3, Issue 01, 31-35 [https://doi.org/10.1017/S1473550404001880].
Role of clays in protecting adsorbed DNA against X-ray radiation
BARBERA, Marco;
2004-01-01
Abstract
The X-ray emission of the young Sun was much harder and intense than today and might have played a significant role in the evolution of complex organics in protoplanetary environments. We investigate the effects of soft X-rays on tryptophan molecules in aqueous solutions at room temperature. As results of the irradiation experiments we detect several light species indicative of fragmentation, together with large molecular structures such as tryptophan dipeptide and tripeptide. Complexification is more evident in H2O solution than in D2O, probably due to isotopic effects. The abundances of peptides depend on the irradiation dose and decrease with increasing energy deposition. Radicals such as D, OD, H and OH, induced by the X-ray interaction with solvents, play a major role in determining the final products.
| File | Dimensione | Formato | |
|---|---|---|---|
|
IJA_2004_3_1_Ciaravella_et_al.pdf
Solo gestori archvio
Dimensione
102.56 kB
Formato
Adobe PDF
|
102.56 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
