Bastnaesite, a common accessory mineral in REE ore deposits, is ideal for U–Pb isotopic dating because of its relatively high U and Th contents.

No abstract

No abstract

No abstract

No abstract

N-Phosphoryl amino acids (NPAAs) are a novel series of N-terminal-activated amino acids that act as the energy source and phosphoryl donor in intra-and intermolecular phosphoryl transfer to form "high-energy" species, such as acetyl phosphate and aminoacyl phosphates, and in the self-assembled synthesis of polypeptides under mild aqueous conditions. In this work, the chemical reactivity of N-mono(methoxyphosphoryl) glycine as a representative was investigated in detail by using a combination of the stable-isotope-labeling ((15)N) technique, (31)P NMR, ESI-MS/MS and LC-MS. The phosphoryl group of NPAAs can be transferred intermolecularly to the carboxy group of another molecule through intramolecular cyclic pentacoordinate phosphoric-amino acid anhydride intermediates. In addition to C-terminal activation by phosphate anhydride, amino acids can also be self-activated by N-phosphorylation. This information not only provides some interesting clues for understanding the active role of the phosphoryl group in living systems, but also shows that the origin of life might be attributed to the chemical evolution of N-phosphoryl amino acids.National Natural Science Foundation of China (NSFC)[21075103, 20972130, 20805037, 20732004

No abstract

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.