Replication stress: an early key event in ochratoxin a genotoxicity?

Ochratoxin A (OTA), a widespread food contaminant and potent renal carcinogen in rodents, is weakly genotoxic in mammalian cells. The mechanisms underlying OTA-induced genetic damage are still poorly understood. In its recent risk assessment, the European food safety authority (EFSA) considered that the specific spectrum of mutations and chromosomal damage induced by OTA may derive from unresolved replication stress.

C-C Cross-Coupling Reactions of Trityl Radicals: Spin Density Delocalization, Exchange Coupling, and a Spin Label.

Organic radicals are usually highly reactive and short-lived species. In contrast, tetrathiatriarylmethyl radicals, the so-called trityl- or TAM-radicals, are stable and do survive over longer times even under in-cell conditions. In addition, they show strong EPR signals, have long phase memory times at room temperature, and are reporters on local oxygen and proton concentrations.