Estimados y estimados lectores (as) de Zona Próxima, con esta edición número 38 iniciamos 2023. Año en el que seguramente cada uno los miembros comunidad académica seguirá? avanzando sus proyectos personales profesionales. Es menester agradecer a investiga- dores creatividad rigor siguen explorando temas desde perspectivas, enfoques teóricos metodológicos diversos se constituyen valiosos aporte...

Ristocetin A (synonym of ristomycin A) belongs to the class of glycopeptide antibiotics which act by selective formation of a stable complex with the developing bacterial cell wall peptidoglycan0. It is suggested2>3) that the complex is stabilized by an array of hydrogen, hydrophobic and ionic interactions in particular with participation of the COOHgroup of the C-terminal D-alanine of the grow...

The sulfate ester of 7V-hydroxy-2-acetamidophenanthrene was prepared and was found to react significantly with methionine, adenosine, and guanosine. The adduci from the methionine reaction was characterized as 1-methylmercapto-2acetamidophenanthrene. The levels of reaction with adenosine and guanosine were comparable, in contrast with the observation that TV-acetoxy-2-acetamidofluorene shows a ...