| An acetyl group was attached to residue 22 to mimic the preceding peptide bond and the C-terminal carboxylate was protonated. |
| On the other hand, in polar conjugated systems such as protonated Schiff bases the funnel shows a structure with just one twisted double bond. |
| In the second basic photocycle step, the chromophore is protonated and structural changes take place in the protein. |
| No one has ever observed hydrogen atoms in a glycoside hydrolase enzyme, and until now we did not know how the catalytic glutamic acid residue is protonated, said Kovalevsky. |
| Initially, a single protonated surfactin molecule was equilibrated in vacuum. |
| Xanthate anions and protonated xanthic acid contain a free thiol moiety and are highly reductive. |
